Added hex editor and basic pattern parsing/highlighting

.gitignore

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+
+cmake-build-debug/

.idea/.gitignore

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+# Default ignored files
+/shelf/
+/workspace.xml
+# Datasource local storage ignored files
+/../../../../../:\_Dev\Cpp\HexEditor\.idea/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/

.idea/HexEditor.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module classpath="CMake" type="CPP_MODULE" version="4" />

.idea/deployment.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="PublishConfigData" remoteFilesAllowedToDisappearOnAutoupload="false">
+    <serverData>
+      <paths name="WSL (e494f5fa-cb38-49f1-b2cb-b9524b92ed51)">
+        <serverdata>
+          <mappings>
+            <mapping local="$PROJECT_DIR$" web="/" />
+          </mappings>
+        </serverdata>
+      </paths>
+    </serverData>
+  </component>
+</project>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CMakeWorkspace" PROJECT_DIR="$PROJECT_DIR$" />
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/HexEditor.iml" filepath="$PROJECT_DIR$/.idea/HexEditor.iml" />
+    </modules>
+  </component>
+</project>

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+project(HexEditor)
+
+set(CMAKE_CXX_STANDARD 20)
+
+find_library(GLFW REQUIRED glfw3)
+find_library(OPENGL REQUIRED OpenGL)
+
+include_directories(include ${GLFW_INCLUDE_DIRS} libs/ImGui/include libs/glad/include)
+
+message(STATUS ${GLFW_STATIC_LIBRARIES})
+
+add_executable(HexEditor
+        source/main.cpp
+        source/window.cpp
+
+        source/parser/lexer.cpp
+        source/parser/parser.cpp
+
+        libs/glad/source/glad.c
+
+        libs/ImGui/source/imgui.cpp
+        libs/ImGui/source/imgui_demo.cpp
+        libs/ImGui/source/imgui_draw.cpp
+        libs/ImGui/source/imgui_widgets.cpp
+        libs/ImGui/source/imgui_impl_glfw.cpp
+        libs/ImGui/source/imgui_impl_opengl3.cpp
+        )
+
+target_link_libraries(HexEditor glfw3)
+
+

include/hex.hpp

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+#pragma once
+
+#include <cstdint>
+
+using u8    = std::uint8_t;
+using u16   = std::uint16_t;
+using u32   = std::uint32_t;
+using u64   = std::uint64_t;
+using u128  = __uint128_t;
+
+using s8  = std::int8_t;
+using s16 = std::int16_t;
+using s32 = std::int32_t;
+using s64 = std::int64_t;
+using s128  = __int128_t;
+
+#include "parser/result.hpp"
+#include "parser/results.hpp"

include/parser/ast_node.hpp

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+#pragma once
+
+#include "token.hpp"
+
+#include <optional>
+#include <vector>
+
+namespace hex::lang {
+
+    class ASTNode {
+    public:
+        enum class Type {
+            VariableDecl,
+            TypeDecl,
+            Struct,
+            Scope,
+        };
+
+        explicit ASTNode(Type type) : m_type(type) {}
+        virtual ~ASTNode() {}
+
+        Type getType() { return this->m_type; }
+
+    private:
+        Type m_type;
+    };
+
+    class ASTNodeVariableDecl : public ASTNode {
+    public:
+        explicit ASTNodeVariableDecl(const Token::TypeToken::Type &type, const std::string &name, const std::string& customTypeName = "")
+            : ASTNode(Type::VariableDecl), m_type(type), m_name(name), m_customTypeName(customTypeName) { }
+
+        const Token::TypeToken::Type& getVariableType() const { return this->m_type; }
+        const std::string& getCustomVariableTypeName() const { return this->m_customTypeName; }
+        const std::string& getVariableName() const { return this->m_name; };
+
+    private:
+        Token::TypeToken::Type m_type;
+        std::string m_name, m_customTypeName;
+    };
+
+    class ASTNodeScope : public ASTNode {
+    public:
+        explicit ASTNodeScope(std::vector<ASTNode*> nodes) : ASTNode(Type::Scope), m_nodes(nodes) { }
+
+        std::vector<ASTNode*> &getNodes() { return this->m_nodes; }
+    private:
+        std::vector<ASTNode*> m_nodes;
+    };
+
+    class ASTNodeStruct : public ASTNode {
+    public:
+        explicit ASTNodeStruct(std::string name, std::vector<ASTNode*> nodes, std::optional<u64> offset = { })
+            : ASTNode(Type::Struct), m_name(name), m_nodes(nodes), m_offset(offset) { }
+
+        const std::string& getName() const { return this->m_name; }
+        std::vector<ASTNode*> &getNodes() { return this->m_nodes; }
+        std::optional<u64> getOffset() { return this->m_offset; };
+    private:
+        std::string m_name;
+        std::vector<ASTNode*> m_nodes;
+        std::optional<u64> m_offset;
+    };
+
+    class ASTNodeTypeDecl : public ASTNode {
+    public:
+        explicit ASTNodeTypeDecl(const Token::TypeToken::Type &type, const std::string &name, const std::string& customTypeName = "")
+                : ASTNode(Type::TypeDecl), m_type(type), m_name(name), m_customTypeName(customTypeName) { }
+
+        const std::string& getTypeName() const { return this->m_name; };
+
+        const Token::TypeToken::Type& getAssignedType() const { return this->m_type; }
+        const std::string& getAssignedCustomTypeName() const { return this->m_customTypeName; }
+    private:
+        Token::TypeToken::Type m_type;
+        std::string m_name, m_customTypeName;
+    };
+
+}

include/parser/lexer.hpp

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+#pragma once
+
+#include <hex.hpp>
+
+#include "token.hpp"
+
+#include <string>
+#include <vector>
+
+namespace hex::lang {
+
+    class Lexer {
+    public:
+        Lexer();
+
+        std::pair<Result, std::vector<Token>> lex(const std::string& code);
+    };
+
+}

include/parser/parser.hpp

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+#pragma once
+
+#include <hex.hpp>
+#include "token.hpp"
+#include "ast_node.hpp"
+
+#include <vector>
+
+namespace hex::lang {
+
+    class Parser {
+    public:
+        Parser();
+
+        std::pair<Result, std::vector<ASTNode*>> parse(const std::vector<Token> &tokens);
+
+    };
+
+}

include/parser/result.hpp

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+#pragma once
+
+#include <cstdint>
+
+namespace hex::lang {
+
+    class Result {
+    public:
+        constexpr Result(const std::uint8_t module, const std::uint32_t desc) noexcept : m_result((module << 24) | (desc & 0x00FFFFFF)) { }
+
+        constexpr std::uint32_t getResult() const noexcept { return this->m_result; }
+        constexpr std::uint8_t getModule() const noexcept { return this->m_result >> 24; }
+        constexpr std::uint32_t getDescription() const noexcept { return this->m_result & 0x00FFFFFF; }
+
+        constexpr bool succeeded() const noexcept { return this->m_result == 0; }
+        constexpr bool failed() const noexcept { return !succeeded(); }
+    private:
+        const std::uint32_t m_result;
+    };
+
+}

include/parser/results.hpp

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+#pragma once
+
+#include "result.hpp"
+
+namespace hex::lang {
+
+    constexpr Result ResultSuccess(0, 0);
+
+    constexpr Result ResultLexicalError(1, 1);
+    constexpr Result ResultParseError(2, 1);
+
+}

include/parser/token.hpp

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+#pragma once
+
+#include <hex.hpp>
+
+#include <string>
+
+namespace hex::lang {
+
+    struct Token {
+        enum class Type : u64 {
+            Keyword,
+            Type,
+            Operator,
+            Integer,
+            Identifier,
+            EndOfExpression,
+            ScopeOpen,
+            ScopeClose,
+            Separator,
+            EndOfProgram
+        } type;
+
+        struct KeywordToken {
+            enum class Keyword {
+                Struct,
+                Using
+            } keyword;
+        } keywordToken;
+        struct IdentifierToken {
+            std::string identifier;
+        } identifierToken;
+        struct OperatorToken {
+            enum class Operator {
+                AtDeclaration,
+                Assignment
+            } op;
+        } operatorToken;
+        struct IntegerToken {
+            s128 integer;
+        } integerToken;
+        struct TypeToken {
+            enum class Type {
+                Unsigned8Bit        = 0x10,
+                Signed8Bit          = 0x11,
+                Unsigned16Bit       = 0x20,
+                Signed16Bit         = 0x21,
+                Unsigned32Bit       = 0x40,
+                Signed32Bit         = 0x41,
+                Unsigned64Bit       = 0x80,
+                Signed64Bit         = 0x81,
+                Unsigned128Bit      = 0x100,
+                Signed128Bit        = 0x101,
+                Float               = 0x42,
+                Double              = 0x82,
+                CustomType          = 0x00
+            } type;
+        } typeToken;
+    };
+}

include/utils.hpp

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+#pragma once
+
+#include <windows.h>
+#include <shobjidl.h>
+
+#include <locale>
+#include <codecvt>
+#include <optional>
+#include <string>
+
+namespace hex {
+
+    std::optional<std::string> openFileDialog() {
+        HRESULT hr = CoInitializeEx(nullptr, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
+        if (SUCCEEDED(hr)) {
+            IFileOpenDialog *pFileOpen;
+
+            hr = CoCreateInstance(CLSID_FileOpenDialog, nullptr, CLSCTX_ALL, IID_IFileOpenDialog, reinterpret_cast<void**>(&pFileOpen));
+
+            if (SUCCEEDED(hr)) {
+                hr = pFileOpen->Show(nullptr);
+
+                if (SUCCEEDED(hr)) {
+                    IShellItem *pItem;
+                    hr = pFileOpen->GetResult(&pItem);
+
+                    if (SUCCEEDED(hr)) {
+                        PWSTR pszFilePath;
+                        hr = pItem->GetDisplayName(SIGDN_FILESYSPATH, &pszFilePath);
+
+                        if (SUCCEEDED(hr)) {
+                            std::wstring_convert<std::codecvt_utf8<wchar_t>, wchar_t> converter;
+
+                            std::string result = converter.to_bytes(pszFilePath);
+
+                            CoTaskMemFree(pszFilePath);
+
+                            return result;
+                        }
+                        pItem->Release();
+                    }
+                }
+                pFileOpen->Release();
+            }
+            CoUninitialize();
+        }
+
+        return { };
+    }
+
+}

include/views/view.hpp

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+#pragma once
+
+#include <hex.hpp>
+
+#include "imgui.h"
+
+namespace hex {
+
+    class View {
+    public:
+        View() { }
+        virtual ~View() { }
+
+        virtual void createView() = 0;
+        virtual void createMenu() { }
+    };
+
+}

include/views/view_hexeditor.hpp

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+#pragma once
+
+#include <windows.h>
+#include <shobjidl.h>
+
+#include "utils.hpp"
+#include "views/view.hpp"
+
+#include "imgui_memory_editor.h"
+
+#include <tuple>
+#include <random>
+#include <vector>
+
+namespace hex {
+
+    class ViewHexEditor : public View {
+    public:
+        ViewHexEditor() : View() {
+            this->m_memoryEditor.ReadFn = [](const ImU8* data, size_t off) -> ImU8 {
+                ViewHexEditor *_this = (ViewHexEditor*)data;
+
+                if (_this->m_file == nullptr)
+                    return 0x00;
+
+                fseek(_this->m_file, off, SEEK_SET);
+
+                ImU8 byte;
+                fread(&byte, sizeof(ImU8), 1, _this->m_file);
+
+                return byte;
+            };
+
+            this->m_memoryEditor.WriteFn = [](ImU8* data, size_t off, ImU8 d) -> void {
+                ViewHexEditor *_this = (ViewHexEditor*)data;
+
+                if (_this->m_file == nullptr)
+                    return;
+
+                fseek(_this->m_file, off, SEEK_SET);
+
+                fwrite(&d, sizeof(ImU8), 1, _this->m_file);
+
+            };
+
+            this->m_memoryEditor.HighlightFn = [](const ImU8* data, size_t off, bool next) -> bool {
+                ViewHexEditor *_this = (ViewHexEditor*)data;
+
+                for (auto& [offset, size, color] : _this->m_highlights) {
+                    if (next && off == (offset + size))
+                            return false;
+
+                    if (off >= offset && off < (offset + size)) {
+                        _this->m_memoryEditor.HighlightColor = color;
+                        return true;
+                    }
+                }
+
+                return false;
+            };
+        }
+        virtual ~ViewHexEditor() { }
+
+        virtual void createView() override {
+            this->m_memoryEditor.DrawWindow("Hex Editor", this, this->m_file == nullptr ? 0x00 : this->m_fileSize);
+        }
+
+        virtual void createMenu() override {
+            if (ImGui::BeginMenu("File")) {
+                if (ImGui::MenuItem("Open File...")) {
+                    auto filePath = openFileDialog();
+                    if (filePath.has_value()) {
+                        if (this->m_file != nullptr)
+                            fclose(this->m_file);
+
+                        this->m_file = fopen(filePath->c_str(), "r+b");
+
+                        fseek(this->m_file, 0, SEEK_END);
+                        this->m_fileSize = ftell(this->m_file);
+                        rewind(this->m_file);
+                    }
+
+                }
+                ImGui::EndMenu();
+            }
+        }
+
+        void setHighlight(u64 offset, size_t size, u32 color = 0) {
+            if (color == 0)
+                color = std::mt19937(std::random_device()())();
+
+            color |= 0xFF00'0000;
+
+            this->m_highlights.emplace_back(offset, size, color);
+        }
+
+        void clearHighlights() {
+            this->m_highlights.clear();
+        }
+
+    private:
+        MemoryEditor m_memoryEditor;
+
+        FILE *m_file = nullptr;
+        size_t m_fileSize = 0;
+
+        std::vector<std::tuple<u64, size_t, u32>> m_highlights;
+    };
+
+}

include/views/view_pattern.hpp

@@ -0,0 +1,163 @@
+#pragma once
+
+#include "parser/ast_node.hpp"
+#include "parser/parser.hpp"
+#include "parser/lexer.hpp"
+#include "views/view.hpp"
+
+#include <concepts>
+#include <cstring>
+
+#include "views/view_hexeditor.hpp"
+
+namespace hex {
+
+    class ViewPattern : public View {
+    public:
+        ViewPattern(ViewHexEditor *hexEditor) : View(), m_hexEditor(hexEditor) {
+            this->m_buffer = new char[0xFFFF];
+            std::memset(this->m_buffer, 0x00, 0xFFFF);
+        }
+        virtual ~ViewPattern() {
+            delete[] this->m_buffer;
+        }
+
+        void createView() override {
+            ImGui::Begin("Pattern", nullptr, ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar);
+            ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0, 0));
+            ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
+
+            auto size = ImGui::GetWindowSize();
+            size.y -= 50;
+            ImGui::InputTextMultiline("Pattern", this->m_buffer, 0xFFFF, size, ImGuiInputTextFlags_AllowTabInput | ImGuiInputTextFlags_CallbackEdit,
+                [](ImGuiInputTextCallbackData* data) -> int {
+                    static hex::lang::Lexer lexer;
+                    static hex::lang::Parser parser;
+
+                    auto _this = static_cast<ViewPattern*>(data->UserData);
+                    _this->m_hexEditor->clearHighlights();
+
+                    auto [lexResult, tokens] = lexer.lex(data->Buf);
+
+                    if (lexResult.failed()) {
+                        return 0;
+                    }
+
+                    auto [parseResult, ast] = parser.parse(tokens);
+                    if (parseResult.failed()) {
+                        for(auto &node : ast) delete node;
+                        return 0;
+                    }
+
+
+                    for (auto &structNode : _this->findNodes<lang::ASTNodeStruct>(lang::ASTNode::Type::Struct, ast)) {
+                        if (!structNode->getOffset().has_value())
+                            continue;
+
+                        u64 offset = structNode->getOffset().value();
+                        if (_this->highlightStruct(ast, structNode, offset) == -1)
+                            _this->m_hexEditor->clearHighlights();
+                    }
+
+                    for(auto &node : ast) delete node;
+
+                    return 1;
+                }, this
+            );
+            ImGui::PopStyleVar(2);
+            ImGui::End();
+        }
+
+    private:
+        char *m_buffer;
+
+        ViewHexEditor *m_hexEditor;
+
+        template<std::derived_from<lang::ASTNode> T>
+        std::vector<T*> findNodes(const lang::ASTNode::Type type, const std::vector<lang::ASTNode*> &nodes) const noexcept {
+            std::vector<T*> result;
+
+            for (const auto & node : nodes)
+                if (node->getType() == type)
+                    result.push_back(static_cast<T*>(node));
+
+            return result;
+        }
+
+        s32 highlightUsingDecls(std::vector<lang::ASTNode*> &ast, lang::ASTNodeTypeDecl* currTypeDeclNode, u64 offset) {
+            if (currTypeDeclNode->getAssignedType() != lang::Token::TypeToken::Type::CustomType) {
+                size_t size = static_cast<u32>(currTypeDeclNode->getAssignedType()) >> 4;
+
+                this->m_hexEditor->setHighlight(offset, size);
+                offset += size;
+            } else {
+                bool foundType = false;
+                for (auto &structNode : findNodes<lang::ASTNodeStruct>(lang::ASTNode::Type::Struct, ast))
+                    if (structNode->getName() == currTypeDeclNode->getAssignedCustomTypeName()) {
+                        offset = this->highlightStruct(ast, structNode, offset);
+                        foundType = true;
+                        break;
+                    }
+
+                for (auto &typeDeclNode : findNodes<lang::ASTNodeTypeDecl>(lang::ASTNode::Type::TypeDecl, ast))
+                    if (typeDeclNode->getTypeName() == currTypeDeclNode->getAssignedCustomTypeName()) {
+                        offset = this->highlightUsingDecls(ast, typeDeclNode, offset);
+                        foundType = true;
+                        break;
+                    }
+
+                if (!foundType)
+                    return -1;
+            }
+
+            return offset;
+        }
+
+        s32 highlightStruct(std::vector<lang::ASTNode*> &ast, lang::ASTNodeStruct* currStructNode, u64 offset) {
+            u64 startOffset = offset;
+
+            for (auto &node : currStructNode->getNodes()) {
+                auto var = static_cast<lang::ASTNodeVariableDecl*>(node);
+
+                if (var->getVariableType() != lang::Token::TypeToken::Type::CustomType) {
+                    size_t size = static_cast<u32>(var->getVariableType()) >> 4;
+
+                    this->m_hexEditor->setHighlight(offset, size);
+                    offset += size;
+                } else {
+                    bool foundType = false;
+                    for (auto &structNode : findNodes<lang::ASTNodeStruct>(lang::ASTNode::Type::Struct, ast))
+                        if (structNode->getName() == var->getCustomVariableTypeName()) {
+                            auto size = this->highlightStruct(ast, structNode, offset);
+
+                            if (size == -1)
+                                return -1;
+
+                            offset += size;
+                            foundType = true;
+                            break;
+                        }
+
+                    for (auto &typeDeclNode : findNodes<lang::ASTNodeTypeDecl>(lang::ASTNode::Type::TypeDecl, ast))
+                        if (typeDeclNode->getTypeName() == var->getCustomVariableTypeName()) {
+                            auto size = this->highlightUsingDecls(ast, typeDeclNode, offset);
+
+                            if (size == -1)
+                                return -1;
+
+                            offset += size;
+                            foundType = true;
+                            break;
+                        }
+
+                    if (!foundType)
+                        return -1;
+                }
+
+            }
+
+            return offset - startOffset;
+        }
+    };
+
+}

include/window.hpp

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <concepts>
+#include <memory>
+#include <vector>
+
+#include "views/view.hpp"
+
+struct GLFWwindow;
+
+namespace hex {
+
+    class Window {
+    public:
+        Window();
+        ~Window();
+
+        void loop();
+
+        template<std::derived_from<View> T, typename ... Args>
+        T* addView(Args& ... args) {
+            this->m_views.emplace_back(new T(args...));
+
+            return static_cast<T*>(this->m_views.back());
+        }
+
+    private:
+        void frameBegin();
+        void frameEnd();
+
+        void initGLFW();
+        void initImGui();
+        void deinitGLFW();
+        void deinitImGui();
+
+        GLFWwindow* m_window;
+
+        std::vector<View*> m_views;
+    };
+
+}

libs/ImGui/include/imconfig.h

@@ -0,0 +1,109 @@
+//-----------------------------------------------------------------------------
+// COMPILE-TIME OPTIONS FOR DEAR IMGUI
+// Runtime options (clipboard callbacks, enabling various features, etc.) can generally be set via the ImGuiIO structure.
+// You can use ImGui::SetAllocatorFunctions() before calling ImGui::CreateContext() to rewire memory allocation functions.
+//-----------------------------------------------------------------------------
+// A) You may edit imconfig.h (and not overwrite it when updating Dear ImGui, or maintain a patch/rebased branch with your modifications to it)
+// B) or '#define IMGUI_USER_CONFIG "my_imgui_config.h"' in your project and then add directives in your own file without touching this template.
+//-----------------------------------------------------------------------------
+// You need to make sure that configuration settings are defined consistently _everywhere_ Dear ImGui is used, which include the imgui*.cpp
+// files but also _any_ of your code that uses Dear ImGui. This is because some compile-time options have an affect on data structures.
+// Defining those options in imconfig.h will ensure every compilation unit gets to see the same data structure layouts.
+// Call IMGUI_CHECKVERSION() from your .cpp files to verify that the data structures your files are using are matching the ones imgui.cpp is using.
+//-----------------------------------------------------------------------------
+
+#pragma once
+
+//---- Define assertion handler. Defaults to calling assert().
+// If your macro uses multiple statements, make sure is enclosed in a 'do { .. } while (0)' block so it can be used as a single statement.
+//#define IM_ASSERT(_EXPR)  MyAssert(_EXPR)
+//#define IM_ASSERT(_EXPR)  ((void)(_EXPR))     // Disable asserts
+
+//---- Define attributes of all API symbols declarations, e.g. for DLL under Windows
+// Using dear imgui via a shared library is not recommended, because of function call overhead and because we don't guarantee backward nor forward ABI compatibility.
+//#define IMGUI_API __declspec( dllexport )
+//#define IMGUI_API __declspec( dllimport )
+
+//---- Don't define obsolete functions/enums/behaviors. Consider enabling from time to time after updating to avoid using soon-to-be obsolete function/names.
+//#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+
+//---- Disable all of Dear ImGui or don't implement standard windows.
+// It is very strongly recommended to NOT disable the demo windows during development. Please read comments in imgui_demo.cpp.
+//#define IMGUI_DISABLE                                     // Disable everything: all headers and source files will be empty.
+//#define IMGUI_DISABLE_DEMO_WINDOWS                        // Disable demo windows: ShowDemoWindow()/ShowStyleEditor() will be empty. Not recommended.
+//#define IMGUI_DISABLE_METRICS_WINDOW                      // Disable debug/metrics window: ShowMetricsWindow() will be empty.
+
+//---- Don't implement some functions to reduce linkage requirements.
+//#define IMGUI_DISABLE_WIN32_DEFAULT_CLIPBOARD_FUNCTIONS   // [Win32] Don't implement default clipboard handler. Won't use and link with OpenClipboard/GetClipboardData/CloseClipboard etc.
+//#define IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS         // [Win32] Don't implement default IME handler. Won't use and link with ImmGetContext/ImmSetCompositionWindow.
+//#define IMGUI_DISABLE_WIN32_FUNCTIONS                     // [Win32] Won't use and link with any Win32 function (clipboard, ime).
+//#define IMGUI_ENABLE_OSX_DEFAULT_CLIPBOARD_FUNCTIONS      // [OSX] Implement default OSX clipboard handler (need to link with '-framework ApplicationServices', this is why this is not the default).
+//#define IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS            // Don't implement ImFormatString/ImFormatStringV so you can implement them yourself (e.g. if you don't want to link with vsnprintf)
+//#define IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS              // Don't implement ImFabs/ImSqrt/ImPow/ImFmod/ImCos/ImSin/ImAcos/ImAtan2 so you can implement them yourself.
+//#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS              // Don't implement ImFileOpen/ImFileClose/ImFileRead/ImFileWrite so you can implement them yourself if you don't want to link with fopen/fclose/fread/fwrite. This will also disable the LogToTTY() function.
+//#define IMGUI_DISABLE_DEFAULT_ALLOCATORS                  // Don't implement default allocators calling malloc()/free() to avoid linking with them. You will need to call ImGui::SetAllocatorFunctions().
+
+//---- Include imgui_user.h at the end of imgui.h as a convenience
+//#define IMGUI_INCLUDE_IMGUI_USER_H
+
+//---- Pack colors to BGRA8 instead of RGBA8 (to avoid converting from one to another)
+//#define IMGUI_USE_BGRA_PACKED_COLOR
+
+//---- Use 32-bit for ImWchar (default is 16-bit) to support unicode planes 1-16. (e.g. point beyond 0xFFFF like emoticons, dingbats, symbols, shapes, ancient languages, etc...)
+//#define IMGUI_USE_WCHAR32
+
+//---- Avoid multiple STB libraries implementations, or redefine path/filenames to prioritize another version
+// By default the embedded implementations are declared static and not available outside of imgui cpp files.
+//#define IMGUI_STB_TRUETYPE_FILENAME   "my_folder/stb_truetype.h"
+//#define IMGUI_STB_RECT_PACK_FILENAME  "my_folder/stb_rect_pack.h"
+//#define IMGUI_DISABLE_STB_TRUETYPE_IMPLEMENTATION
+//#define IMGUI_DISABLE_STB_RECT_PACK_IMPLEMENTATION
+
+//---- Unless IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS is defined, use the much faster STB sprintf library implementation of vsnprintf instead of the one from the default C library.
+// Note that stb_sprintf.h is meant to be provided by the user and available in the include path at compile time. Also, the compatibility checks of the arguments and formats done by clang and GCC will be disabled in order to support the extra formats provided by STB sprintf.
+// #define IMGUI_USE_STB_SPRINTF
+
+//---- Define constructor and implicit cast operators to convert back<>forth between your math types and ImVec2/ImVec4.
+// This will be inlined as part of ImVec2 and ImVec4 class declarations.
+/*
+#define IM_VEC2_CLASS_EXTRA                                                 \
+        ImVec2(const MyVec2& f) { x = f.x; y = f.y; }                       \
+        operator MyVec2() const { return MyVec2(x,y); }
+
+#define IM_VEC4_CLASS_EXTRA                                                 \
+        ImVec4(const MyVec4& f) { x = f.x; y = f.y; z = f.z; w = f.w; }     \
+        operator MyVec4() const { return MyVec4(x,y,z,w); }
+*/
+
+//---- Use 32-bit vertex indices (default is 16-bit) is one way to allow large meshes with more than 64K vertices.
+// Your renderer backend will need to support it (most example renderer backends support both 16/32-bit indices).
+// Another way to allow large meshes while keeping 16-bit indices is to handle ImDrawCmd::VtxOffset in your renderer.
+// Read about ImGuiBackendFlags_RendererHasVtxOffset for details.
+//#define ImDrawIdx unsigned int
+
+//---- Override ImDrawCallback signature (will need to modify renderer backends accordingly)
+//struct ImDrawList;
+//struct ImDrawCmd;
+//typedef void (*MyImDrawCallback)(const ImDrawList* draw_list, const ImDrawCmd* cmd, void* my_renderer_user_data);
+//#define ImDrawCallback MyImDrawCallback
+
+//---- Debug Tools: Macro to break in Debugger
+// (use 'Metrics->Tools->Item Picker' to pick widgets with the mouse and break into them for easy debugging.)
+//#define IM_DEBUG_BREAK  IM_ASSERT(0)
+//#define IM_DEBUG_BREAK  __debugbreak()
+
+//---- Debug Tools: Have the Item Picker break in the ItemAdd() function instead of ItemHoverable(),
+// (which comes earlier in the code, will catch a few extra items, allow picking items other than Hovered one.)
+// This adds a small runtime cost which is why it is not enabled by default.
+//#define IMGUI_DEBUG_TOOL_ITEM_PICKER_EX
+
+//---- Debug Tools: Enable slower asserts
+//#define IMGUI_DEBUG_PARANOID
+
+//---- Tip: You can add extra functions within the ImGui:: namespace, here or in your own headers files.
+/*
+namespace ImGui
+{
+    void MyFunction(const char* name, const MyMatrix44& v);
+}
+*/

libs/ImGui/include/imgui_impl_glfw.h

@@ -0,0 +1,41 @@
+// dear imgui: Platform Backend for GLFW
+// This needs to be used along with a Renderer (e.g. OpenGL3, Vulkan..)
+// (Info: GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
+
+// Implemented features:
+//  [X] Platform: Clipboard support.
+//  [X] Platform: Gamepad support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
+//  [x] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange'. FIXME: 3 cursors types are missing from GLFW.
+//  [X] Platform: Keyboard arrays indexed using GLFW_KEY_* codes, e.g. ImGui::IsKeyPressed(GLFW_KEY_SPACE).
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
+// Issues:
+//  [ ] Platform: Multi-viewport support: ParentViewportID not honored, and so io.ConfigViewportsNoDefaultParent has no effect (minor).
+
+// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// About GLSL version:
+// The 'glsl_version' initialization parameter defaults to "#version 150" if NULL.
+// Only override if your GL version doesn't handle this GLSL version. Keep NULL if unsure!
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+struct GLFWwindow;
+struct GLFWmonitor;
+
+IMGUI_IMPL_API bool     ImGui_ImplGlfw_InitForOpenGL(GLFWwindow* window, bool install_callbacks);
+IMGUI_IMPL_API bool     ImGui_ImplGlfw_InitForVulkan(GLFWwindow* window, bool install_callbacks);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplGlfw_NewFrame();
+
+// GLFW callbacks
+// - When calling Init with 'install_callbacks=true': GLFW callbacks will be installed for you. They will call user's previously installed callbacks, if any.
+// - When calling Init with 'install_callbacks=false': GLFW callbacks won't be installed. You will need to call those function yourself from your own GLFW callbacks.
+IMGUI_IMPL_API void     ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow* window, int button, int action, int mods);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_ScrollCallback(GLFWwindow* window, double xoffset, double yoffset);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c);
+IMGUI_IMPL_API void     ImGui_ImplGlfw_MonitorCallback(GLFWmonitor* monitor, int event);

libs/ImGui/include/imgui_impl_opengl3.h

@@ -0,0 +1,88 @@
+// dear imgui: Renderer Backend for modern OpenGL with shaders / programmatic pipeline
+// - Desktop GL: 2.x 3.x 4.x
+// - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)
+// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [x] Renderer: Desktop GL only: Support for large meshes (64k+ vertices) with 16-bit indices.
+
+// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// About Desktop OpenGL function loaders:
+//  Modern Desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
+//  Helper libraries are often used for this purpose! Here we are supporting a few common ones (gl3w, glew, glad).
+//  You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own.
+
+// About GLSL version:
+//  The 'glsl_version' initialization parameter should be NULL (default) or a "#version XXX" string.
+//  On computer platform the GLSL version default to "#version 130". On OpenGL ES 3 platform it defaults to "#version 300 es"
+//  Only override if your GL version doesn't handle this GLSL version. See GLSL version table at the top of imgui_impl_opengl3.cpp.
+
+#pragma once
+#include "imgui.h"      // IMGUI_IMPL_API
+
+// Backend API
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_Init(const char* glsl_version = NULL);
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_Shutdown();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_NewFrame();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data);
+
+// (Optional) Called by Init/NewFrame/Shutdown
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_CreateFontsTexture();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyFontsTexture();
+IMGUI_IMPL_API bool     ImGui_ImplOpenGL3_CreateDeviceObjects();
+IMGUI_IMPL_API void     ImGui_ImplOpenGL3_DestroyDeviceObjects();
+
+// Specific OpenGL ES versions
+//#define IMGUI_IMPL_OPENGL_ES2     // Auto-detected on Emscripten
+//#define IMGUI_IMPL_OPENGL_ES3     // Auto-detected on iOS/Android
+
+// Attempt to auto-detect the default Desktop GL loader based on available header files.
+// If auto-detection fails or doesn't select the same GL loader file as used by your application,
+// you are likely to get a crash in ImGui_ImplOpenGL3_Init().
+// You can explicitly select a loader by using one of the '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.
+#if !defined(IMGUI_IMPL_OPENGL_ES2) \
+ && !defined(IMGUI_IMPL_OPENGL_ES3) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GL3W) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GLEW) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GLAD) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3) \
+ && !defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
+
+// Try to detect GLES on matching platforms
+#if defined(__APPLE__)
+#include "TargetConditionals.h"
+#endif
+#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV)) || (defined(__ANDROID__))
+#define IMGUI_IMPL_OPENGL_ES3               // iOS, Android  -> GL ES 3, "#version 300 es"
+#elif defined(__EMSCRIPTEN__)
+#define IMGUI_IMPL_OPENGL_ES2               // Emscripten    -> GL ES 2, "#version 100"
+
+// Otherwise try to detect supported Desktop OpenGL loaders..
+#elif defined(__has_include)
+#if __has_include(<GL/glew.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GLEW
+#elif __has_include(<glad/glad.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GLAD
+#elif __has_include(<glad/gl.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GLAD2
+#elif __has_include(<GL/gl3w.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GL3W
+#elif __has_include(<glbinding/glbinding.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GLBINDING3
+#elif __has_include(<glbinding/Binding.h>)
+    #define IMGUI_IMPL_OPENGL_LOADER_GLBINDING2
+#else
+    #error "Cannot detect OpenGL loader!"
+#endif
+#else
+    #define IMGUI_IMPL_OPENGL_LOADER_GL3W   // Default to GL3W embedded in our repository
+#endif
+
+#endif

libs/ImGui/include/imgui_memory_editor.h

@@ -0,0 +1,751 @@
+// Mini memory editor for Dear ImGui (to embed in your game/tools)
+// Get latest version at http://www.github.com/ocornut/imgui_club
+//
+// Right-click anywhere to access the Options menu!
+// You can adjust the keyboard repeat delay/rate in ImGuiIO.
+// The code assume a mono-space font for simplicity!
+// If you don't use the default font, use ImGui::PushFont()/PopFont() to switch to a mono-space font before caling this.
+//
+// Usage:
+//   // Create a window and draw memory editor inside it:
+//   static MemoryEditor mem_edit_1;
+//   static char data[0x10000];
+//   size_t data_size = 0x10000;
+//   mem_edit_1.DrawWindow("Memory Editor", data, data_size);
+//
+// Usage:
+//   // If you already have a window, use DrawContents() instead:
+//   static MemoryEditor mem_edit_2;
+//   ImGui::Begin("MyWindow")
+//   mem_edit_2.DrawContents(this, sizeof(*this), (size_t)this);
+//   ImGui::End();
+//
+// Changelog:
+// - v0.10: initial version
+// - v0.23 (2017/08/17): added to github. fixed right-arrow triggering a byte write.
+// - v0.24 (2018/06/02): changed DragInt("Rows" to use a %d data format (which is desirable since imgui 1.61).
+// - v0.25 (2018/07/11): fixed wording: all occurrences of "Rows" renamed to "Columns".
+// - v0.26 (2018/08/02): fixed clicking on hex region
+// - v0.30 (2018/08/02): added data preview for common data types
+// - v0.31 (2018/10/10): added OptUpperCaseHex option to select lower/upper casing display [@samhocevar]
+// - v0.32 (2018/10/10): changed signatures to use void* instead of unsigned char*
+// - v0.33 (2018/10/10): added OptShowOptions option to hide all the interactive option setting.
+// - v0.34 (2019/05/07): binary preview now applies endianness setting [@nicolasnoble]
+// - v0.35 (2020/01/29): using ImGuiDataType available since Dear ImGui 1.69.
+// - v0.36 (2020/05/05): minor tweaks, minor refactor.
+// - v0.40 (2020/10/04): fix misuse of ImGuiListClipper API, broke with Dear ImGui 1.79. made cursor position appears on left-side of edit box. option popup appears on mouse release. fix MSVC warnings where _CRT_SECURE_NO_WARNINGS wasn't working in recent versions.
+// - v0.41 (2020/10/05): fix when using with keyboard/gamepad navigation enabled.
+// - v0.42 (2020/10/14): fix for . character in ASCII view always being greyed out.
+//
+// Todo/Bugs:
+// - This is generally old code, it should work but please don't use this as reference!
+// - Arrows are being sent to the InputText() about to disappear which for LeftArrow makes the text cursor appear at position 1 for one frame.
+// - Using InputText() is awkward and maybe overkill here, consider implementing something custom.
+
+#pragma once
+
+#include <stdio.h>      // sprintf, scanf
+#include <stdint.h>     // uint8_t, etc.
+
+#ifdef _MSC_VER
+#define _PRISizeT   "I"
+#define ImSnprintf  _snprintf
+#else
+#define _PRISizeT   "z"
+#define ImSnprintf  snprintf
+#endif
+
+#ifdef _MSC_VER
+#pragma warning (push)
+#pragma warning (disable: 4996) // warning C4996: 'sprintf': This function or variable may be unsafe.
+#endif
+
+struct MemoryEditor
+{
+    enum DataFormat
+    {
+        DataFormat_Bin = 0,
+        DataFormat_Dec = 1,
+        DataFormat_Hex = 2,
+        DataFormat_COUNT
+    };
+
+    // Settings
+    bool            Open;                                       // = true   // set to false when DrawWindow() was closed. ignore if not using DrawWindow().
+    bool            ReadOnly;                                   // = false  // disable any editing.
+    int             Cols;                                       // = 16     // number of columns to display.
+    bool            OptShowOptions;                             // = true   // display options button/context menu. when disabled, options will be locked unless you provide your own UI for them.
+    bool            OptShowDataPreview;                         // = false  // display a footer previewing the decimal/binary/hex/float representation of the currently selected bytes.
+    bool            OptShowHexII;                               // = false  // display values in HexII representation instead of regular hexadecimal: hide null/zero bytes, ascii values as ".X".
+    bool            OptShowAscii;                               // = true   // display ASCII representation on the right side.
+    bool            OptGreyOutZeroes;                           // = true   // display null/zero bytes using the TextDisabled color.
+    bool            OptUpperCaseHex;                            // = true   // display hexadecimal values as "FF" instead of "ff".
+    int             OptMidColsCount;                            // = 8      // set to 0 to disable extra spacing between every mid-cols.
+    int             OptAddrDigitsCount;                         // = 0      // number of addr digits to display (default calculated based on maximum displayed addr).
+    ImU32           HighlightColor;                             //          // background color of highlighted bytes.
+    ImU8            (*ReadFn)(const ImU8* data, size_t off);    // = 0      // optional handler to read bytes.
+    void            (*WriteFn)(ImU8* data, size_t off, ImU8 d); // = 0      // optional handler to write bytes.
+    bool            (*HighlightFn)(const ImU8* data, size_t off, bool next);//= 0      // optional handler to return Highlight property (to support non-contiguous highlighting).
+
+    // [Internal State]
+    bool            ContentsWidthChanged;
+    size_t          DataPreviewAddr;
+    size_t          DataEditingAddr;
+    bool            DataEditingTakeFocus;
+    char            DataInputBuf[32];
+    char            AddrInputBuf[32];
+    size_t          GotoAddr;
+    size_t          HighlightMin, HighlightMax;
+    int             PreviewEndianess;
+    ImGuiDataType   PreviewDataType;
+
+    MemoryEditor()
+    {
+        // Settings
+        Open = true;
+        ReadOnly = false;
+        Cols = 16;
+        OptShowOptions = true;
+        OptShowDataPreview = false;
+        OptShowHexII = false;
+        OptShowAscii = true;
+        OptGreyOutZeroes = true;
+        OptUpperCaseHex = true;
+        OptMidColsCount = 8;
+        OptAddrDigitsCount = 0;
+        HighlightColor = IM_COL32(255, 255, 255, 50);
+        ReadFn = NULL;
+        WriteFn = NULL;
+        HighlightFn = NULL;
+
+        // State/Internals
+        ContentsWidthChanged = false;
+        DataPreviewAddr = DataEditingAddr = (size_t)-1;
+        DataEditingTakeFocus = false;
+        memset(DataInputBuf, 0, sizeof(DataInputBuf));
+        memset(AddrInputBuf, 0, sizeof(AddrInputBuf));
+        GotoAddr = (size_t)-1;
+        HighlightMin = HighlightMax = (size_t)-1;
+        PreviewEndianess = 0;
+        PreviewDataType = ImGuiDataType_S32;
+    }
+
+    void GotoAddrAndHighlight(size_t addr_min, size_t addr_max)
+    {
+        GotoAddr = addr_min;
+        HighlightMin = addr_min;
+        HighlightMax = addr_max;
+    }
+
+    struct Sizes
+    {
+        int     AddrDigitsCount;
+        float   LineHeight;
+        float   GlyphWidth;
+        float   HexCellWidth;
+        float   SpacingBetweenMidCols;
+        float   PosHexStart;
+        float   PosHexEnd;
+        float   PosAsciiStart;
+        float   PosAsciiEnd;
+        float   WindowWidth;
+
+        Sizes() { memset(this, 0, sizeof(*this)); }
+    };
+
+    void CalcSizes(Sizes& s, size_t mem_size, size_t base_display_addr)
+    {
+        ImGuiStyle& style = ImGui::GetStyle();
+        s.AddrDigitsCount = OptAddrDigitsCount;
+        if (s.AddrDigitsCount == 0)
+            for (size_t n = base_display_addr + mem_size - 1; n > 0; n >>= 4)
+                s.AddrDigitsCount++;
+        s.LineHeight = ImGui::GetTextLineHeight();
+        s.GlyphWidth = ImGui::CalcTextSize("F").x + 1;                  // We assume the font is mono-space
+        s.HexCellWidth = (float)(int)(s.GlyphWidth * 2.5f);             // "FF " we include trailing space in the width to easily catch clicks everywhere
+        s.SpacingBetweenMidCols = (float)(int)(s.HexCellWidth * 0.25f); // Every OptMidColsCount columns we add a bit of extra spacing
+        s.PosHexStart = (s.AddrDigitsCount + 2) * s.GlyphWidth;
+        s.PosHexEnd = s.PosHexStart + (s.HexCellWidth * Cols);
+        s.PosAsciiStart = s.PosAsciiEnd = s.PosHexEnd;
+        if (OptShowAscii)
+        {
+            s.PosAsciiStart = s.PosHexEnd + s.GlyphWidth * 1;
+            if (OptMidColsCount > 0)
+                s.PosAsciiStart += (float)((Cols + OptMidColsCount - 1) / OptMidColsCount) * s.SpacingBetweenMidCols;
+            s.PosAsciiEnd = s.PosAsciiStart + Cols * s.GlyphWidth;
+        }
+        s.WindowWidth = s.PosAsciiEnd + style.ScrollbarSize + style.WindowPadding.x * 2 + s.GlyphWidth;
+    }
+
+    // Standalone Memory Editor window
+    void DrawWindow(const char* title, void* mem_data, size_t mem_size, size_t base_display_addr = 0x0000)
+    {
+        Sizes s;
+        CalcSizes(s, mem_size, base_display_addr);
+        ImGui::SetNextWindowSizeConstraints(ImVec2(0.0f, 0.0f), ImVec2(s.WindowWidth, FLT_MAX));
+
+        Open = true;
+        if (ImGui::Begin(title, &Open, ImGuiWindowFlags_NoScrollbar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoTitleBar))
+        {
+            if (ImGui::IsWindowHovered(ImGuiHoveredFlags_RootAndChildWindows) && ImGui::IsMouseReleased(ImGuiMouseButton_Right))
+                ImGui::OpenPopup("context");
+            DrawContents(mem_data, mem_size, base_display_addr);
+            if (ContentsWidthChanged)
+            {
+                CalcSizes(s, mem_size, base_display_addr);
+                ImGui::SetWindowSize(ImVec2(s.WindowWidth, ImGui::GetWindowSize().y));
+            }
+        }
+        ImGui::End();
+
+    }
+
+    // Memory Editor contents only
+    void DrawContents(void* mem_data_void, size_t mem_size, size_t base_display_addr = 0x0000)
+    {
+        if (Cols < 1)
+            Cols = 1;
+
+        if (mem_size == 0)
+            return;
+
+        ImU8* mem_data = (ImU8*)mem_data_void;
+        Sizes s;
+        CalcSizes(s, mem_size, base_display_addr);
+        ImGuiStyle& style = ImGui::GetStyle();
+
+        // We begin into our scrolling region with the 'ImGuiWindowFlags_NoMove' in order to prevent click from moving the window.
+        // This is used as a facility since our main click detection code doesn't assign an ActiveId so the click would normally be caught as a window-move.
+        const float height_separator = style.ItemSpacing.y;
+        float footer_height = 0;
+        if (OptShowOptions)
+            footer_height += height_separator + ImGui::GetFrameHeightWithSpacing() * 1;
+        if (OptShowDataPreview)
+            footer_height += height_separator + ImGui::GetFrameHeightWithSpacing() * 1 + ImGui::GetTextLineHeightWithSpacing() * 3;
+        ImGui::BeginChild("##scrolling", ImVec2(0, -footer_height), false, ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoNav);
+        ImDrawList* draw_list = ImGui::GetWindowDrawList();
+
+        ImGui::PushStyleVar(ImGuiStyleVar_FramePadding, ImVec2(0, 0));
+        ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, ImVec2(0, 0));
+
+        // We are not really using the clipper API correctly here, because we rely on visible_start_addr/visible_end_addr for our scrolling function.
+        const int line_total_count = (int)((mem_size + Cols - 1) / Cols);
+        ImGuiListClipper clipper;
+        clipper.Begin(line_total_count, s.LineHeight);
+        clipper.Step();
+        const size_t visible_start_addr = clipper.DisplayStart * Cols;
+        const size_t visible_end_addr = clipper.DisplayEnd * Cols;
+
+        bool data_next = false;
+
+        if (ReadOnly || DataEditingAddr >= mem_size)
+            DataEditingAddr = (size_t)-1;
+        if (DataPreviewAddr >= mem_size)
+            DataPreviewAddr = (size_t)-1;
+
+        size_t preview_data_type_size = OptShowDataPreview ? DataTypeGetSize(PreviewDataType) : 0;
+
+        size_t data_editing_addr_backup = DataEditingAddr;
+        size_t data_editing_addr_next = (size_t)-1;
+        if (DataEditingAddr != (size_t)-1)
+        {
+            // Move cursor but only apply on next frame so scrolling with be synchronized (because currently we can't change the scrolling while the window is being rendered)
+            if (ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_UpArrow)) && DataEditingAddr >= (size_t)Cols)          { data_editing_addr_next = DataEditingAddr - Cols; DataEditingTakeFocus = true; }
+            else if (ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_DownArrow)) && DataEditingAddr < mem_size - Cols) { data_editing_addr_next = DataEditingAddr + Cols; DataEditingTakeFocus = true; }
+            else if (ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_LeftArrow)) && DataEditingAddr > 0)               { data_editing_addr_next = DataEditingAddr - 1; DataEditingTakeFocus = true; }
+            else if (ImGui::IsKeyPressed(ImGui::GetKeyIndex(ImGuiKey_RightArrow)) && DataEditingAddr < mem_size - 1)   { data_editing_addr_next = DataEditingAddr + 1; DataEditingTakeFocus = true; }
+        }
+        if (data_editing_addr_next != (size_t)-1 && (data_editing_addr_next / Cols) != (data_editing_addr_backup / Cols))
+        {
+            // Track cursor movements
+            const int scroll_offset = ((int)(data_editing_addr_next / Cols) - (int)(data_editing_addr_backup / Cols));
+            const bool scroll_desired = (scroll_offset < 0 && data_editing_addr_next < visible_start_addr + Cols * 2) || (scroll_offset > 0 && data_editing_addr_next > visible_end_addr - Cols * 2);
+            if (scroll_desired)
+                ImGui::SetScrollY(ImGui::GetScrollY() + scroll_offset * s.LineHeight);
+        }
+
+        // Draw vertical separator
+        ImVec2 window_pos = ImGui::GetWindowPos();
+        if (OptShowAscii)
+            draw_list->AddLine(ImVec2(window_pos.x + s.PosAsciiStart - s.GlyphWidth, window_pos.y), ImVec2(window_pos.x + s.PosAsciiStart - s.GlyphWidth, window_pos.y + 9999), ImGui::GetColorU32(ImGuiCol_Border));
+
+        const ImU32 color_text = ImGui::GetColorU32(ImGuiCol_Text);
+        const ImU32 color_disabled = OptGreyOutZeroes ? ImGui::GetColorU32(ImGuiCol_TextDisabled) : color_text;
+
+        const char* format_address = OptUpperCaseHex ? "%0*" _PRISizeT "X: " : "%0*" _PRISizeT "x: ";
+        const char* format_data = OptUpperCaseHex ? "%0*" _PRISizeT "X" : "%0*" _PRISizeT "x";
+        const char* format_byte = OptUpperCaseHex ? "%02X" : "%02x";
+        const char* format_byte_space = OptUpperCaseHex ? "%02X " : "%02x ";
+
+        for (int line_i = clipper.DisplayStart; line_i < clipper.DisplayEnd; line_i++) // display only visible lines
+        {
+            size_t addr = (size_t)(line_i * Cols);
+            ImGui::Text(format_address, s.AddrDigitsCount, base_display_addr + addr);
+
+            // Draw Hexadecimal
+            for (int n = 0; n < Cols && addr < mem_size; n++, addr++)
+            {
+                float byte_pos_x = s.PosHexStart + s.HexCellWidth * n;
+                if (OptMidColsCount > 0)
+                    byte_pos_x += (float)(n / OptMidColsCount) * s.SpacingBetweenMidCols;
+                ImGui::SameLine(byte_pos_x);
+
+                // Draw highlight
+                bool is_highlight_from_user_range = (addr >= HighlightMin && addr < HighlightMax);
+                bool is_highlight_from_user_func = (HighlightFn && HighlightFn(mem_data, addr, false));
+                bool is_highlight_from_preview = (addr >= DataPreviewAddr && addr < DataPreviewAddr + preview_data_type_size);
+                if (is_highlight_from_user_range || is_highlight_from_user_func || is_highlight_from_preview)
+                {
+                    ImVec2 pos = ImGui::GetCursorScreenPos();
+                    float highlight_width = s.GlyphWidth * 2;
+                    bool is_next_byte_highlighted =  (addr + 1 < mem_size) && ((HighlightMax != (size_t)-1 && addr + 1 < HighlightMax) || (HighlightFn && HighlightFn(mem_data, addr + 1, true)));
+                    if (is_next_byte_highlighted || (n + 1 == Cols))
+                    {
+                        highlight_width = s.HexCellWidth;
+                        if (OptMidColsCount > 0 && n > 0 && (n + 1) < Cols && ((n + 1) % OptMidColsCount) == 0)
+                            highlight_width += s.SpacingBetweenMidCols;
+                    }
+                    draw_list->AddRectFilled(pos, ImVec2(pos.x + highlight_width, pos.y + s.LineHeight), HighlightColor);
+                }
+
+                if (DataEditingAddr == addr)
+                {
+                    // Display text input on current byte
+                    bool data_write = false;
+                    ImGui::PushID((void*)addr);
+                    if (DataEditingTakeFocus)
+                    {
+                        ImGui::SetKeyboardFocusHere();
+                        ImGui::CaptureKeyboardFromApp(true);
+                        sprintf(AddrInputBuf, format_data, s.AddrDigitsCount, base_display_addr + addr);
+                        sprintf(DataInputBuf, format_byte, ReadFn ? ReadFn(mem_data, addr) : mem_data[addr]);
+                    }
+                    ImGui::PushItemWidth(s.GlyphWidth * 2);
+                    struct UserData
+                    {
+                        // FIXME: We should have a way to retrieve the text edit cursor position more easily in the API, this is rather tedious. This is such a ugly mess we may be better off not using InputText() at all here.
+                        static int Callback(ImGuiInputTextCallbackData* data)
+                        {
+                            UserData* user_data = (UserData*)data->UserData;
+                            if (!data->HasSelection())
+                                user_data->CursorPos = data->CursorPos;
+                            if (data->SelectionStart == 0 && data->SelectionEnd == data->BufTextLen)
+                            {
+                                // When not editing a byte, always rewrite its content (this is a bit tricky, since InputText technically "owns" the master copy of the buffer we edit it in there)
+                                data->DeleteChars(0, data->BufTextLen);
+                                data->InsertChars(0, user_data->CurrentBufOverwrite);
+                                data->SelectionStart = 0;
+                                data->SelectionEnd = 2;
+                                data->CursorPos = 0;
+                            }
+                            return 0;
+                        }
+                        char   CurrentBufOverwrite[3];  // Input
+                        int    CursorPos;               // Output
+                    };
+                    UserData user_data;
+                    user_data.CursorPos = -1;
+                    sprintf(user_data.CurrentBufOverwrite, format_byte, ReadFn ? ReadFn(mem_data, addr) : mem_data[addr]);
+                    ImGuiInputTextFlags flags = ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_EnterReturnsTrue | ImGuiInputTextFlags_AutoSelectAll | ImGuiInputTextFlags_NoHorizontalScroll | ImGuiInputTextFlags_AlwaysInsertMode | ImGuiInputTextFlags_CallbackAlways;
+                    if (ImGui::InputText("##data", DataInputBuf, 32, flags, UserData::Callback, &user_data))
+                        data_write = data_next = true;
+                    else if (!DataEditingTakeFocus && !ImGui::IsItemActive())
+                        DataEditingAddr = data_editing_addr_next = (size_t)-1;
+                    DataEditingTakeFocus = false;
+                    ImGui::PopItemWidth();
+                    if (user_data.CursorPos >= 2)
+                        data_write = data_next = true;
+                    if (data_editing_addr_next != (size_t)-1)
+                        data_write = data_next = false;
+                    unsigned int data_input_value = 0;
+                    if (data_write && sscanf(DataInputBuf, "%X", &data_input_value) == 1)
+                    {
+                        if (WriteFn)
+                            WriteFn(mem_data, addr, (ImU8)data_input_value);
+                        else
+                            mem_data[addr] = (ImU8)data_input_value;
+                    }
+                    ImGui::PopID();
+                }
+                else
+                {
+                    // NB: The trailing space is not visible but ensure there's no gap that the mouse cannot click on.
+                    ImU8 b = ReadFn ? ReadFn(mem_data, addr) : mem_data[addr];
+
+                    if (OptShowHexII)
+                    {
+                        if ((b >= 32 && b < 128))
+                            ImGui::Text(".%c ", b);
+                        else if (b == 0xFF && OptGreyOutZeroes)
+                            ImGui::TextDisabled("## ");
+                        else if (b == 0x00)
+                            ImGui::Text("   ");
+                        else
+                            ImGui::Text(format_byte_space, b);
+                    }
+                    else
+                    {
+                        if (b == 0 && OptGreyOutZeroes)
+                            ImGui::TextDisabled("00 ");
+                        else
+                            ImGui::Text(format_byte_space, b);
+                    }
+                    if (!ReadOnly && ImGui::IsItemHovered() && ImGui::IsMouseClicked(0))
+                    {
+                        DataEditingTakeFocus = true;
+                        data_editing_addr_next = addr;
+                    }
+                }
+            }
+
+            if (OptShowAscii)
+            {
+                // Draw ASCII values
+                ImGui::SameLine(s.PosAsciiStart);
+                ImVec2 pos = ImGui::GetCursorScreenPos();
+                addr = line_i * Cols;
+                ImGui::PushID(line_i);
+                if (ImGui::InvisibleButton("ascii", ImVec2(s.PosAsciiEnd - s.PosAsciiStart, s.LineHeight)))
+                {
+                    DataEditingAddr = DataPreviewAddr = addr + (size_t)((ImGui::GetIO().MousePos.x - pos.x) / s.GlyphWidth);
+                    DataEditingTakeFocus = true;
+                }
+                ImGui::PopID();
+                for (int n = 0; n < Cols && addr < mem_size; n++, addr++)
+                {
+                    if (addr == DataEditingAddr)
+                    {
+                        draw_list->AddRectFilled(pos, ImVec2(pos.x + s.GlyphWidth, pos.y + s.LineHeight), ImGui::GetColorU32(ImGuiCol_FrameBg));
+                        draw_list->AddRectFilled(pos, ImVec2(pos.x + s.GlyphWidth, pos.y + s.LineHeight), ImGui::GetColorU32(ImGuiCol_TextSelectedBg));
+                    }
+                    unsigned char c = ReadFn ? ReadFn(mem_data, addr) : mem_data[addr];
+                    char display_c = (c < 32 || c >= 128) ? '.' : c;
+                    draw_list->AddText(pos, (display_c == c) ? color_text : color_disabled, &display_c, &display_c + 1);
+                    pos.x += s.GlyphWidth;
+                }
+            }
+        }
+        IM_ASSERT(clipper.Step() == false);
+        clipper.End();
+        ImGui::PopStyleVar(2);
+        ImGui::EndChild();
+
+        if (data_next && DataEditingAddr < mem_size)
+        {
+            DataEditingAddr = DataPreviewAddr = DataEditingAddr + 1;
+            DataEditingTakeFocus = true;
+        }
+        else if (data_editing_addr_next != (size_t)-1)
+        {
+            DataEditingAddr = DataPreviewAddr = data_editing_addr_next;
+        }
+
+        const bool lock_show_data_preview = OptShowDataPreview;
+        if (OptShowOptions)
+        {
+            ImGui::Separator();
+            DrawOptionsLine(s, mem_data, mem_size, base_display_addr);
+        }
+
+        if (lock_show_data_preview)
+        {
+            ImGui::Separator();
+            DrawPreviewLine(s, mem_data, mem_size, base_display_addr);
+        }
+
+        // Notify the main window of our ideal child content size (FIXME: we are missing an API to get the contents size from the child)
+        ImGui::SetCursorPosX(s.WindowWidth);
+    }
+
+    void DrawOptionsLine(const Sizes& s, void* mem_data, size_t mem_size, size_t base_display_addr)
+    {
+        IM_UNUSED(mem_data);
+        ImGuiStyle& style = ImGui::GetStyle();
+        const char* format_range = OptUpperCaseHex ? "Range %0*" _PRISizeT "X..%0*" _PRISizeT "X" : "Range %0*" _PRISizeT "x..%0*" _PRISizeT "x";
+
+        // Options menu
+        if (ImGui::Button("Options"))
+            ImGui::OpenPopup("context");
+        if (ImGui::BeginPopup("context"))
+        {
+            ImGui::PushItemWidth(56);
+            if (ImGui::DragInt("##cols", &Cols, 0.2f, 4, 32, "%d cols")) { ContentsWidthChanged = true; if (Cols < 1) Cols = 1; }
+            ImGui::PopItemWidth();
+            ImGui::Checkbox("Show Data Preview", &OptShowDataPreview);
+            ImGui::Checkbox("Show HexII", &OptShowHexII);
+            if (ImGui::Checkbox("Show Ascii", &OptShowAscii)) { ContentsWidthChanged = true; }
+            ImGui::Checkbox("Grey out zeroes", &OptGreyOutZeroes);
+            ImGui::Checkbox("Uppercase Hex", &OptUpperCaseHex);
+
+            ImGui::EndPopup();
+        }
+
+        ImGui::SameLine();
+        ImGui::Text(format_range, s.AddrDigitsCount, base_display_addr, s.AddrDigitsCount, base_display_addr + mem_size - 1);
+        ImGui::SameLine();
+        ImGui::PushItemWidth((s.AddrDigitsCount + 1) * s.GlyphWidth + style.FramePadding.x * 2.0f);
+        if (ImGui::InputText("##addr", AddrInputBuf, 32, ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_EnterReturnsTrue))
+        {
+            size_t goto_addr;
+            if (sscanf(AddrInputBuf, "%" _PRISizeT "X", &goto_addr) == 1)
+            {
+                GotoAddr = goto_addr - base_display_addr;
+                HighlightMin = HighlightMax = (size_t)-1;
+            }
+        }
+        ImGui::PopItemWidth();
+
+        if (GotoAddr != (size_t)-1)
+        {
+            if (GotoAddr < mem_size)
+            {
+                ImGui::BeginChild("##scrolling");
+                ImGui::SetScrollFromPosY(ImGui::GetCursorStartPos().y + (GotoAddr / Cols) * ImGui::GetTextLineHeight());
+                ImGui::EndChild();
+                DataEditingAddr = DataPreviewAddr = GotoAddr;
+                DataEditingTakeFocus = true;
+            }
+            GotoAddr = (size_t)-1;
+        }
+    }
+
+    void DrawPreviewLine(const Sizes& s, void* mem_data_void, size_t mem_size, size_t base_display_addr)
+    {
+        IM_UNUSED(base_display_addr);
+        ImU8* mem_data = (ImU8*)mem_data_void;
+        ImGuiStyle& style = ImGui::GetStyle();
+        ImGui::AlignTextToFramePadding();
+        ImGui::Text("Preview as:");
+        ImGui::SameLine();
+        ImGui::PushItemWidth((s.GlyphWidth * 10.0f) + style.FramePadding.x * 2.0f + style.ItemInnerSpacing.x);
+        if (ImGui::BeginCombo("##combo_type", DataTypeGetDesc(PreviewDataType), ImGuiComboFlags_HeightLargest))
+        {
+            for (int n = 0; n < ImGuiDataType_COUNT; n++)
+                if (ImGui::Selectable(DataTypeGetDesc((ImGuiDataType)n), PreviewDataType == n))
+                    PreviewDataType = (ImGuiDataType)n;
+            ImGui::EndCombo();
+        }
+        ImGui::PopItemWidth();
+        ImGui::SameLine();
+        ImGui::PushItemWidth((s.GlyphWidth * 6.0f) + style.FramePadding.x * 2.0f + style.ItemInnerSpacing.x);
+        ImGui::Combo("##combo_endianess", &PreviewEndianess, "LE\0BE\0\0");
+        ImGui::PopItemWidth();
+
+        char buf[128] = "";
+        float x = s.GlyphWidth * 6.0f;
+        bool has_value = DataPreviewAddr != (size_t)-1;
+        if (has_value)
+            DrawPreviewData(DataPreviewAddr, mem_data, mem_size, PreviewDataType, DataFormat_Dec, buf, (size_t)IM_ARRAYSIZE(buf));
+        ImGui::Text("Dec"); ImGui::SameLine(x); ImGui::TextUnformatted(has_value ? buf : "N/A");
+        if (has_value)
+            DrawPreviewData(DataPreviewAddr, mem_data, mem_size, PreviewDataType, DataFormat_Hex, buf, (size_t)IM_ARRAYSIZE(buf));
+        ImGui::Text("Hex"); ImGui::SameLine(x); ImGui::TextUnformatted(has_value ? buf : "N/A");
+        if (has_value)
+            DrawPreviewData(DataPreviewAddr, mem_data, mem_size, PreviewDataType, DataFormat_Bin, buf, (size_t)IM_ARRAYSIZE(buf));
+        buf[IM_ARRAYSIZE(buf) - 1] = 0;
+        ImGui::Text("Bin"); ImGui::SameLine(x); ImGui::TextUnformatted(has_value ? buf : "N/A");
+    }
+
+    // Utilities for Data Preview
+    const char* DataTypeGetDesc(ImGuiDataType data_type) const
+    {
+        const char* descs[] = { "Int8", "Uint8", "Int16", "Uint16", "Int32", "Uint32", "Int64", "Uint64", "Float", "Double" };
+        IM_ASSERT(data_type >= 0 && data_type < ImGuiDataType_COUNT);
+        return descs[data_type];
+    }
+
+    size_t DataTypeGetSize(ImGuiDataType data_type) const
+    {
+        const size_t sizes[] = { 1, 1, 2, 2, 4, 4, 8, 8, sizeof(float), sizeof(double) };
+        IM_ASSERT(data_type >= 0 && data_type < ImGuiDataType_COUNT);
+        return sizes[data_type];
+    }
+
+    const char* DataFormatGetDesc(DataFormat data_format) const
+    {
+        const char* descs[] = { "Bin", "Dec", "Hex" };
+        IM_ASSERT(data_format >= 0 && data_format < DataFormat_COUNT);
+        return descs[data_format];
+    }
+
+    bool IsBigEndian() const
+    {
+        uint16_t x = 1;
+        char c[2];
+        memcpy(c, &x, 2);
+        return c[0] != 0;
+    }
+
+    static void* EndianessCopyBigEndian(void* _dst, void* _src, size_t s, int is_little_endian)
+    {
+        if (is_little_endian)
+        {
+            uint8_t* dst = (uint8_t*)_dst;
+            uint8_t* src = (uint8_t*)_src + s - 1;
+            for (int i = 0, n = (int)s; i < n; ++i)
+                memcpy(dst++, src--, 1);
+            return _dst;
+        }
+        else
+        {
+            return memcpy(_dst, _src, s);
+        }
+    }
+
+    static void* EndianessCopyLittleEndian(void* _dst, void* _src, size_t s, int is_little_endian)
+    {
+        if (is_little_endian)
+        {
+            return memcpy(_dst, _src, s);
+        }
+        else
+        {
+            uint8_t* dst = (uint8_t*)_dst;
+            uint8_t* src = (uint8_t*)_src + s - 1;
+            for (int i = 0, n = (int)s; i < n; ++i)
+                memcpy(dst++, src--, 1);
+            return _dst;
+        }
+    }
+
+    void* EndianessCopy(void* dst, void* src, size_t size) const
+    {
+        static void* (*fp)(void*, void*, size_t, int) = NULL;
+        if (fp == NULL)
+            fp = IsBigEndian() ? EndianessCopyBigEndian : EndianessCopyLittleEndian;
+        return fp(dst, src, size, PreviewEndianess);
+    }
+
+    const char* FormatBinary(const uint8_t* buf, int width) const
+    {
+        IM_ASSERT(width <= 64);
+        size_t out_n = 0;
+        static char out_buf[64 + 8 + 1];
+        int n = width / 8;
+        for (int j = n - 1; j >= 0; --j)
+        {
+            for (int i = 0; i < 8; ++i)
+                out_buf[out_n++] = (buf[j] & (1 << (7 - i))) ? '1' : '0';
+            out_buf[out_n++] = ' ';
+        }
+        IM_ASSERT(out_n < IM_ARRAYSIZE(out_buf));
+        out_buf[out_n] = 0;
+        return out_buf;
+    }
+
+    // [Internal]
+    void DrawPreviewData(size_t addr, const ImU8* mem_data, size_t mem_size, ImGuiDataType data_type, DataFormat data_format, char* out_buf, size_t out_buf_size) const
+    {
+        uint8_t buf[8];
+        size_t elem_size = DataTypeGetSize(data_type);
+        size_t size = addr + elem_size > mem_size ? mem_size - addr : elem_size;
+        if (ReadFn)
+            for (int i = 0, n = (int)size; i < n; ++i)
+                buf[i] = ReadFn(mem_data, addr + i);
+        else
+            memcpy(buf, mem_data + addr, size);
+
+        if (data_format == DataFormat_Bin)
+        {
+            uint8_t binbuf[8];
+            EndianessCopy(binbuf, buf, size);
+            ImSnprintf(out_buf, out_buf_size, "%s", FormatBinary(binbuf, (int)size * 8));
+            return;
+        }
+
+        out_buf[0] = 0;
+        switch (data_type)
+        {
+            case ImGuiDataType_S8:
+            {
+                int8_t int8 = 0;
+                EndianessCopy(&int8, buf, size);
+                if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hhd", int8); return; }
+                if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%02x", int8 & 0xFF); return; }
+                break;
+            }
+            case ImGuiDataType_U8:
+            {
+                uint8_t uint8 = 0;
+                EndianessCopy(&uint8, buf, size);
+                if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hhu", uint8); return; }
+                if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%02x", uint8 & 0XFF); return; }
+                break;
+            }
+            case ImGuiDataType_S16:
+            {
+                int16_t int16 = 0;
+                EndianessCopy(&int16, buf, size);
+                if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hd", int16); return; }
+                if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%04x", int16 & 0xFFFF); return; }
+                break;
+            }
+            case ImGuiDataType_U16:
+            {
+                uint16_t uint16 = 0;
+                EndianessCopy(&uint16, buf, size);
+                if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%hu", uint16); return; }
+                if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%04x", uint16 & 0xFFFF); return; }
+                break;
+            }
+            case ImGuiDataType_S32:
+            {
+                int32_t int32 = 0;
+                EndianessCopy(&int32, buf, size);
+                if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%d", int32); return; }
+                if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%08x", int32); return; }
+                break;
+            }
+            case ImGuiDataType_U32:
+            {
+                uint32_t uint32 = 0;
+                EndianessCopy(&uint32, buf, size);
+                if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%u", uint32); return; }
+                if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%08x", uint32); return; }
+                break;
+            }
+            case ImGuiDataType_S64:
+            {
+                int64_t int64 = 0;
+                EndianessCopy(&int64, buf, size);
+                if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%lld", (long long)int64); return; }
+                if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%016llx", (long long)int64); return; }
+                break;
+            }
+            case ImGuiDataType_U64:
+            {
+                uint64_t uint64 = 0;
+                EndianessCopy(&uint64, buf, size);
+                if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%llu", (long long)uint64); return; }
+                if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "0x%016llx", (long long)uint64); return; }
+                break;
+            }
+            case ImGuiDataType_Float:
+            {
+                float float32 = 0.0f;
+                EndianessCopy(&float32, buf, size);
+                if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%f", float32); return; }
+                if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "%a", float32); return; }
+                break;
+            }
+            case ImGuiDataType_Double:
+            {
+                double float64 = 0.0;
+                EndianessCopy(&float64, buf, size);
+                if (data_format == DataFormat_Dec) { ImSnprintf(out_buf, out_buf_size, "%f", float64); return; }
+                if (data_format == DataFormat_Hex) { ImSnprintf(out_buf, out_buf_size, "%a", float64); return; }
+                break;
+            }
+            case ImGuiDataType_COUNT:
+                break;
+        } // Switch
+        IM_ASSERT(0); // Shouldn't reach
+    }
+};
+
+#undef _PRISizeT
+#undef ImSnprintf
+
+#ifdef _MSC_VER
+#pragma warning (pop)
+#endif

libs/ImGui/include/imstb_rectpack.h

@@ -0,0 +1,639 @@
+// [DEAR IMGUI]
+// This is a slightly modified version of stb_rect_pack.h 1.00.
+// Those changes would need to be pushed into nothings/stb:
+// - Added STBRP__CDECL
+// Grep for [DEAR IMGUI] to find the changes.
+
+// stb_rect_pack.h - v1.00 - public domain - rectangle packing
+// Sean Barrett 2014
+//
+// Useful for e.g. packing rectangular textures into an atlas.
+// Does not do rotation.
+//
+// Not necessarily the awesomest packing method, but better than
+// the totally naive one in stb_truetype (which is primarily what
+// this is meant to replace).
+//
+// Has only had a few tests run, may have issues.
+//
+// More docs to come.
+//
+// No memory allocations; uses qsort() and assert() from stdlib.
+// Can override those by defining STBRP_SORT and STBRP_ASSERT.
+//
+// This library currently uses the Skyline Bottom-Left algorithm.
+//
+// Please note: better rectangle packers are welcome! Please
+// implement them to the same API, but with a different init
+// function.
+//
+// Credits
+//
+//  Library
+//    Sean Barrett
+//  Minor features
+//    Martins Mozeiko
+//    github:IntellectualKitty
+//    
+//  Bugfixes / warning fixes
+//    Jeremy Jaussaud
+//    Fabian Giesen
+//
+// Version history:
+//
+//     1.00  (2019-02-25)  avoid small space waste; gracefully fail too-wide rectangles
+//     0.99  (2019-02-07)  warning fixes
+//     0.11  (2017-03-03)  return packing success/fail result
+//     0.10  (2016-10-25)  remove cast-away-const to avoid warnings
+//     0.09  (2016-08-27)  fix compiler warnings
+//     0.08  (2015-09-13)  really fix bug with empty rects (w=0 or h=0)
+//     0.07  (2015-09-13)  fix bug with empty rects (w=0 or h=0)
+//     0.06  (2015-04-15)  added STBRP_SORT to allow replacing qsort
+//     0.05:  added STBRP_ASSERT to allow replacing assert
+//     0.04:  fixed minor bug in STBRP_LARGE_RECTS support
+//     0.01:  initial release
+//
+// LICENSE
+//
+//   See end of file for license information.
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//       INCLUDE SECTION
+//
+
+#ifndef STB_INCLUDE_STB_RECT_PACK_H
+#define STB_INCLUDE_STB_RECT_PACK_H
+
+#define STB_RECT_PACK_VERSION  1
+
+#ifdef STBRP_STATIC
+#define STBRP_DEF static
+#else
+#define STBRP_DEF extern
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct stbrp_context stbrp_context;
+typedef struct stbrp_node    stbrp_node;
+typedef struct stbrp_rect    stbrp_rect;
+
+#ifdef STBRP_LARGE_RECTS
+typedef int            stbrp_coord;
+#else
+typedef unsigned short stbrp_coord;
+#endif
+
+STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects);
+// Assign packed locations to rectangles. The rectangles are of type
+// 'stbrp_rect' defined below, stored in the array 'rects', and there
+// are 'num_rects' many of them.
+//
+// Rectangles which are successfully packed have the 'was_packed' flag
+// set to a non-zero value and 'x' and 'y' store the minimum location
+// on each axis (i.e. bottom-left in cartesian coordinates, top-left
+// if you imagine y increasing downwards). Rectangles which do not fit
+// have the 'was_packed' flag set to 0.
+//
+// You should not try to access the 'rects' array from another thread
+// while this function is running, as the function temporarily reorders
+// the array while it executes.
+//
+// To pack into another rectangle, you need to call stbrp_init_target
+// again. To continue packing into the same rectangle, you can call
+// this function again. Calling this multiple times with multiple rect
+// arrays will probably produce worse packing results than calling it
+// a single time with the full rectangle array, but the option is
+// available.
+//
+// The function returns 1 if all of the rectangles were successfully
+// packed and 0 otherwise.
+
+struct stbrp_rect
+{
+   // reserved for your use:
+   int            id;
+
+   // input:
+   stbrp_coord    w, h;
+
+   // output:
+   stbrp_coord    x, y;
+   int            was_packed;  // non-zero if valid packing
+
+}; // 16 bytes, nominally
+
+
+STBRP_DEF void stbrp_init_target (stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes);
+// Initialize a rectangle packer to:
+//    pack a rectangle that is 'width' by 'height' in dimensions
+//    using temporary storage provided by the array 'nodes', which is 'num_nodes' long
+//
+// You must call this function every time you start packing into a new target.
+//
+// There is no "shutdown" function. The 'nodes' memory must stay valid for
+// the following stbrp_pack_rects() call (or calls), but can be freed after
+// the call (or calls) finish.
+//
+// Note: to guarantee best results, either:
+//       1. make sure 'num_nodes' >= 'width'
+//   or  2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
+//
+// If you don't do either of the above things, widths will be quantized to multiples
+// of small integers to guarantee the algorithm doesn't run out of temporary storage.
+//
+// If you do #2, then the non-quantized algorithm will be used, but the algorithm
+// may run out of temporary storage and be unable to pack some rectangles.
+
+STBRP_DEF void stbrp_setup_allow_out_of_mem (stbrp_context *context, int allow_out_of_mem);
+// Optionally call this function after init but before doing any packing to
+// change the handling of the out-of-temp-memory scenario, described above.
+// If you call init again, this will be reset to the default (false).
+
+
+STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic);
+// Optionally select which packing heuristic the library should use. Different
+// heuristics will produce better/worse results for different data sets.
+// If you call init again, this will be reset to the default.
+
+enum
+{
+   STBRP_HEURISTIC_Skyline_default=0,
+   STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default,
+   STBRP_HEURISTIC_Skyline_BF_sortHeight
+};
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// the details of the following structures don't matter to you, but they must
+// be visible so you can handle the memory allocations for them
+
+struct stbrp_node
+{
+   stbrp_coord  x,y;
+   stbrp_node  *next;
+};
+
+struct stbrp_context
+{
+   int width;
+   int height;
+   int align;
+   int init_mode;
+   int heuristic;
+   int num_nodes;
+   stbrp_node *active_head;
+   stbrp_node *free_head;
+   stbrp_node extra[2]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2'
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//     IMPLEMENTATION SECTION
+//
+
+#ifdef STB_RECT_PACK_IMPLEMENTATION
+#ifndef STBRP_SORT
+#include <stdlib.h>
+#define STBRP_SORT qsort
+#endif
+
+#ifndef STBRP_ASSERT
+#include <assert.h>
+#define STBRP_ASSERT assert
+#endif
+
+// [DEAR IMGUI] Added STBRP__CDECL
+#ifdef _MSC_VER
+#define STBRP__NOTUSED(v)  (void)(v)
+#define STBRP__CDECL __cdecl
+#else
+#define STBRP__NOTUSED(v)  (void)sizeof(v)
+#define STBRP__CDECL
+#endif
+
+enum
+{
+   STBRP__INIT_skyline = 1
+};
+
+STBRP_DEF void stbrp_setup_heuristic(stbrp_context *context, int heuristic)
+{
+   switch (context->init_mode) {
+      case STBRP__INIT_skyline:
+         STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight);
+         context->heuristic = heuristic;
+         break;
+      default:
+         STBRP_ASSERT(0);
+   }
+}
+
+STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context *context, int allow_out_of_mem)
+{
+   if (allow_out_of_mem)
+      // if it's ok to run out of memory, then don't bother aligning them;
+      // this gives better packing, but may fail due to OOM (even though
+      // the rectangles easily fit). @TODO a smarter approach would be to only
+      // quantize once we've hit OOM, then we could get rid of this parameter.
+      context->align = 1;
+   else {
+      // if it's not ok to run out of memory, then quantize the widths
+      // so that num_nodes is always enough nodes.
+      //
+      // I.e. num_nodes * align >= width
+      //                  align >= width / num_nodes
+      //                  align = ceil(width/num_nodes)
+
+      context->align = (context->width + context->num_nodes-1) / context->num_nodes;
+   }
+}
+
+STBRP_DEF void stbrp_init_target(stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes)
+{
+   int i;
+#ifndef STBRP_LARGE_RECTS
+   STBRP_ASSERT(width <= 0xffff && height <= 0xffff);
+#endif
+
+   for (i=0; i < num_nodes-1; ++i)
+      nodes[i].next = &nodes[i+1];
+   nodes[i].next = NULL;
+   context->init_mode = STBRP__INIT_skyline;
+   context->heuristic = STBRP_HEURISTIC_Skyline_default;
+   context->free_head = &nodes[0];
+   context->active_head = &context->extra[0];
+   context->width = width;
+   context->height = height;
+   context->num_nodes = num_nodes;
+   stbrp_setup_allow_out_of_mem(context, 0);
+
+   // node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
+   context->extra[0].x = 0;
+   context->extra[0].y = 0;
+   context->extra[0].next = &context->extra[1];
+   context->extra[1].x = (stbrp_coord) width;
+#ifdef STBRP_LARGE_RECTS
+   context->extra[1].y = (1<<30);
+#else
+   context->extra[1].y = 65535;
+#endif
+   context->extra[1].next = NULL;
+}
+
+// find minimum y position if it starts at x1
+static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0, int width, int *pwaste)
+{
+   stbrp_node *node = first;
+   int x1 = x0 + width;
+   int min_y, visited_width, waste_area;
+
+   STBRP__NOTUSED(c);
+
+   STBRP_ASSERT(first->x <= x0);
+
+   #if 0
+   // skip in case we're past the node
+   while (node->next->x <= x0)
+      ++node;
+   #else
+   STBRP_ASSERT(node->next->x > x0); // we ended up handling this in the caller for efficiency
+   #endif
+
+   STBRP_ASSERT(node->x <= x0);
+
+   min_y = 0;
+   waste_area = 0;
+   visited_width = 0;
+   while (node->x < x1) {
+      if (node->y > min_y) {
+         // raise min_y higher.
+         // we've accounted for all waste up to min_y,
+         // but we'll now add more waste for everything we've visted
+         waste_area += visited_width * (node->y - min_y);
+         min_y = node->y;
+         // the first time through, visited_width might be reduced
+         if (node->x < x0)
+            visited_width += node->next->x - x0;
+         else
+            visited_width += node->next->x - node->x;
+      } else {
+         // add waste area
+         int under_width = node->next->x - node->x;
+         if (under_width + visited_width > width)
+            under_width = width - visited_width;
+         waste_area += under_width * (min_y - node->y);
+         visited_width += under_width;
+      }
+      node = node->next;
+   }
+
+   *pwaste = waste_area;
+   return min_y;
+}
+
+typedef struct
+{
+   int x,y;
+   stbrp_node **prev_link;
+} stbrp__findresult;
+
+static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context *c, int width, int height)
+{
+   int best_waste = (1<<30), best_x, best_y = (1 << 30);
+   stbrp__findresult fr;
+   stbrp_node **prev, *node, *tail, **best = NULL;
+
+   // align to multiple of c->align
+   width = (width + c->align - 1);
+   width -= width % c->align;
+   STBRP_ASSERT(width % c->align == 0);
+
+   // if it can't possibly fit, bail immediately
+   if (width > c->width || height > c->height) {
+      fr.prev_link = NULL;
+      fr.x = fr.y = 0;
+      return fr;
+   }
+
+   node = c->active_head;
+   prev = &c->active_head;
+   while (node->x + width <= c->width) {
+      int y,waste;
+      y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste);
+      if (c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) { // actually just want to test BL
+         // bottom left
+         if (y < best_y) {
+            best_y = y;
+            best = prev;
+         }
+      } else {
+         // best-fit
+         if (y + height <= c->height) {
+            // can only use it if it first vertically
+            if (y < best_y || (y == best_y && waste < best_waste)) {
+               best_y = y;
+               best_waste = waste;
+               best = prev;
+            }
+         }
+      }
+      prev = &node->next;
+      node = node->next;
+   }
+
+   best_x = (best == NULL) ? 0 : (*best)->x;
+
+   // if doing best-fit (BF), we also have to try aligning right edge to each node position
+   //
+   // e.g, if fitting
+   //
+   //     ____________________
+   //    |____________________|
+   //
+   //            into
+   //
+   //   |                         |
+   //   |             ____________|
+   //   |____________|
+   //
+   // then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
+   //
+   // This makes BF take about 2x the time
+
+   if (c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) {
+      tail = c->active_head;
+      node = c->active_head;
+      prev = &c->active_head;
+      // find first node that's admissible
+      while (tail->x < width)
+         tail = tail->next;
+      while (tail) {
+         int xpos = tail->x - width;
+         int y,waste;
+         STBRP_ASSERT(xpos >= 0);
+         // find the left position that matches this
+         while (node->next->x <= xpos) {
+            prev = &node->next;
+            node = node->next;
+         }
+         STBRP_ASSERT(node->next->x > xpos && node->x <= xpos);
+         y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste);
+         if (y + height <= c->height) {
+            if (y <= best_y) {
+               if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) {
+                  best_x = xpos;
+                  STBRP_ASSERT(y <= best_y);
+                  best_y = y;
+                  best_waste = waste;
+                  best = prev;
+               }
+            }
+         }
+         tail = tail->next;
+      }         
+   }
+
+   fr.prev_link = best;
+   fr.x = best_x;
+   fr.y = best_y;
+   return fr;
+}
+
+static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height)
+{
+   // find best position according to heuristic
+   stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
+   stbrp_node *node, *cur;
+
+   // bail if:
+   //    1. it failed
+   //    2. the best node doesn't fit (we don't always check this)
+   //    3. we're out of memory
+   if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
+      res.prev_link = NULL;
+      return res;
+   }
+
+   // on success, create new node
+   node = context->free_head;
+   node->x = (stbrp_coord) res.x;
+   node->y = (stbrp_coord) (res.y + height);
+
+   context->free_head = node->next;
+
+   // insert the new node into the right starting point, and
+   // let 'cur' point to the remaining nodes needing to be
+   // stiched back in
+
+   cur = *res.prev_link;
+   if (cur->x < res.x) {
+      // preserve the existing one, so start testing with the next one
+      stbrp_node *next = cur->next;
+      cur->next = node;
+      cur = next;
+   } else {
+      *res.prev_link = node;
+   }
+
+   // from here, traverse cur and free the nodes, until we get to one
+   // that shouldn't be freed
+   while (cur->next && cur->next->x <= res.x + width) {
+      stbrp_node *next = cur->next;
+      // move the current node to the free list
+      cur->next = context->free_head;
+      context->free_head = cur;
+      cur = next;
+   }
+
+   // stitch the list back in
+   node->next = cur;
+
+   if (cur->x < res.x + width)
+      cur->x = (stbrp_coord) (res.x + width);
+
+#ifdef _DEBUG
+   cur = context->active_head;
+   while (cur->x < context->width) {
+      STBRP_ASSERT(cur->x < cur->next->x);
+      cur = cur->next;
+   }
+   STBRP_ASSERT(cur->next == NULL);
+
+   {
+      int count=0;
+      cur = context->active_head;
+      while (cur) {
+         cur = cur->next;
+         ++count;
+      }
+      cur = context->free_head;
+      while (cur) {
+         cur = cur->next;
+         ++count;
+      }
+      STBRP_ASSERT(count == context->num_nodes+2);
+   }
+#endif
+
+   return res;
+}
+
+// [DEAR IMGUI] Added STBRP__CDECL
+static int STBRP__CDECL rect_height_compare(const void *a, const void *b)
+{
+   const stbrp_rect *p = (const stbrp_rect *) a;
+   const stbrp_rect *q = (const stbrp_rect *) b;
+   if (p->h > q->h)
+      return -1;
+   if (p->h < q->h)
+      return  1;
+   return (p->w > q->w) ? -1 : (p->w < q->w);
+}
+
+// [DEAR IMGUI] Added STBRP__CDECL
+static int STBRP__CDECL rect_original_order(const void *a, const void *b)
+{
+   const stbrp_rect *p = (const stbrp_rect *) a;
+   const stbrp_rect *q = (const stbrp_rect *) b;
+   return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
+}
+
+#ifdef STBRP_LARGE_RECTS
+#define STBRP__MAXVAL  0xffffffff
+#else
+#define STBRP__MAXVAL  0xffff
+#endif
+
+STBRP_DEF int stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
+{
+   int i, all_rects_packed = 1;
+
+   // we use the 'was_packed' field internally to allow sorting/unsorting
+   for (i=0; i < num_rects; ++i) {
+      rects[i].was_packed = i;
+   }
+
+   // sort according to heuristic
+   STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
+
+   for (i=0; i < num_rects; ++i) {
+      if (rects[i].w == 0 || rects[i].h == 0) {
+         rects[i].x = rects[i].y = 0;  // empty rect needs no space
+      } else {
+         stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
+         if (fr.prev_link) {
+            rects[i].x = (stbrp_coord) fr.x;
+            rects[i].y = (stbrp_coord) fr.y;
+         } else {
+            rects[i].x = rects[i].y = STBRP__MAXVAL;
+         }
+      }
+   }
+
+   // unsort
+   STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
+
+   // set was_packed flags and all_rects_packed status
+   for (i=0; i < num_rects; ++i) {
+      rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
+      if (!rects[i].was_packed)
+         all_rects_packed = 0;
+   }
+
+   // return the all_rects_packed status
+   return all_rects_packed;
+}
+#endif
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of 
+this software and associated documentation files (the "Software"), to deal in 
+the Software without restriction, including without limitation the rights to 
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies 
+of the Software, and to permit persons to whom the Software is furnished to do 
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all 
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this 
+software, either in source code form or as a compiled binary, for any purpose, 
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this 
+software dedicate any and all copyright interest in the software to the public 
+domain. We make this dedication for the benefit of the public at large and to 
+the detriment of our heirs and successors. We intend this dedication to be an 
+overt act of relinquishment in perpetuity of all present and future rights to 
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/

libs/ImGui/source/imgui_impl_glfw.cpp

@@ -0,0 +1,858 @@
+// dear imgui: Platform Backend for GLFW
+// This needs to be used along with a Renderer (e.g. OpenGL3, Vulkan..)
+// (Info: GLFW is a cross-platform general purpose library for handling windows, inputs, OpenGL/Vulkan graphics context creation, etc.)
+// (Requires: GLFW 3.1+. Prefer GLFW 3.3+ for full feature support.)
+
+// Implemented features:
+//  [X] Platform: Clipboard support.
+//  [X] Platform: Gamepad support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad'.
+//  [X] Platform: Mouse cursor shape and visibility. Disable with 'io.ConfigFlags |= ImGuiConfigFlags_NoMouseCursorChange' (note: the resizing cursors requires GLFW 3.4+).
+//  [X] Platform: Keyboard arrays indexed using GLFW_KEY_* codes, e.g. ImGui::IsKeyPressed(GLFW_KEY_SPACE).
+//  [X] Platform: Multi-viewport support (multiple windows). Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+
+// Issues:
+//  [ ] Platform: Multi-viewport support: ParentViewportID not honored, and so io.ConfigViewportsNoDefaultParent has no effect (minor).
+
+// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2020-01-17: Inputs: Disable error callback while assigning mouse cursors because some X11 setup don't have them and it generates errors.
+//  2019-12-05: Inputs: Added support for new mouse cursors added in GLFW 3.4+ (resizing cursors, not allowed cursor).
+//  2019-10-18: Misc: Previously installed user callbacks are now restored on shutdown.
+//  2019-07-21: Inputs: Added mapping for ImGuiKey_KeyPadEnter.
+//  2019-05-11: Inputs: Don't filter value from character callback before calling AddInputCharacter().
+//  2019-03-12: Misc: Preserve DisplayFramebufferScale when main window is minimized.
+//  2018-11-30: Misc: Setting up io.BackendPlatformName so it can be displayed in the About Window.
+//  2018-11-07: Inputs: When installing our GLFW callbacks, we save user's previously installed ones - if any - and chain call them.
+//  2018-08-01: Inputs: Workaround for Emscripten which doesn't seem to handle focus related calls.
+//  2018-06-29: Inputs: Added support for the ImGuiMouseCursor_Hand cursor.
+//  2018-06-08: Misc: Extracted imgui_impl_glfw.cpp/.h away from the old combined GLFW+OpenGL/Vulkan examples.
+//  2018-03-20: Misc: Setup io.BackendFlags ImGuiBackendFlags_HasMouseCursors flag + honor ImGuiConfigFlags_NoMouseCursorChange flag.
+//  2018-02-20: Inputs: Added support for mouse cursors (ImGui::GetMouseCursor() value, passed to glfwSetCursor()).
+//  2018-02-06: Misc: Removed call to ImGui::Shutdown() which is not available from 1.60 WIP, user needs to call CreateContext/DestroyContext themselves.
+//  2018-02-06: Inputs: Added mapping for ImGuiKey_Space.
+//  2018-01-25: Inputs: Added gamepad support if ImGuiConfigFlags_NavEnableGamepad is set.
+//  2018-01-25: Inputs: Honoring the io.WantSetMousePos by repositioning the mouse (when using navigation and ImGuiConfigFlags_NavMoveMouse is set).
+//  2018-01-20: Inputs: Added Horizontal Mouse Wheel support.
+//  2018-01-18: Inputs: Added mapping for ImGuiKey_Insert.
+//  2017-08-25: Inputs: MousePos set to -FLT_MAX,-FLT_MAX when mouse is unavailable/missing (instead of -1,-1).
+//  2016-10-15: Misc: Added a void* user_data parameter to Clipboard function handlers.
+
+#include "imgui.h"
+#include "imgui_impl_glfw.h"
+
+// GLFW
+#include <GLFW/glfw3.h>
+#ifdef _WIN32
+#undef APIENTRY
+#define GLFW_EXPOSE_NATIVE_WIN32
+#include <GLFW/glfw3native.h>   // for glfwGetWin32Window
+#endif
+#define GLFW_HAS_WINDOW_TOPMOST       (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3200) // 3.2+ GLFW_FLOATING
+#define GLFW_HAS_WINDOW_HOVERED       (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+ GLFW_HOVERED
+#define GLFW_HAS_WINDOW_ALPHA         (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+ glfwSetWindowOpacity
+#define GLFW_HAS_PER_MONITOR_DPI      (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+ glfwGetMonitorContentScale
+#define GLFW_HAS_VULKAN               (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3200) // 3.2+ glfwCreateWindowSurface
+#define GLFW_HAS_FOCUS_WINDOW         (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3200) // 3.2+ glfwFocusWindow
+#define GLFW_HAS_FOCUS_ON_SHOW        (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+ GLFW_FOCUS_ON_SHOW
+#define GLFW_HAS_MONITOR_WORK_AREA    (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3300) // 3.3+ glfwGetMonitorWorkarea
+#define GLFW_HAS_OSX_WINDOW_POS_FIX   (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 + GLFW_VERSION_REVISION * 10 >= 3310) // 3.3.1+ Fixed: Resizing window repositions it on MacOS #1553
+#ifdef GLFW_RESIZE_NESW_CURSOR        // Let's be nice to people who pulled GLFW between 2019-04-16 (3.4 define) and 2019-11-29 (cursors defines) // FIXME: Remove when GLFW 3.4 is released?
+#define GLFW_HAS_NEW_CURSORS          (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3400) // 3.4+ GLFW_RESIZE_ALL_CURSOR, GLFW_RESIZE_NESW_CURSOR, GLFW_RESIZE_NWSE_CURSOR, GLFW_NOT_ALLOWED_CURSOR
+#else
+#define GLFW_HAS_NEW_CURSORS          (0)
+#endif
+#ifdef GLFW_MOUSE_PASSTHROUGH         // Let's be nice to people who pulled GLFW between 2019-04-16 (3.4 define) and 2020-07-17 (passthrough)
+#define GLFW_HAS_MOUSE_PASSTHROUGH    (GLFW_VERSION_MAJOR * 1000 + GLFW_VERSION_MINOR * 100 >= 3400) // 3.4+ GLFW_MOUSE_PASSTHROUGH
+#else
+#define GLFW_HAS_MOUSE_PASSTHROUGH    (0)
+#endif
+
+// Data
+enum GlfwClientApi
+{
+    GlfwClientApi_Unknown,
+    GlfwClientApi_OpenGL,
+    GlfwClientApi_Vulkan
+};
+static GLFWwindow*          g_Window = NULL;    // Main window
+static GlfwClientApi        g_ClientApi = GlfwClientApi_Unknown;
+static double               g_Time = 0.0;
+static bool                 g_MouseJustPressed[ImGuiMouseButton_COUNT] = {};
+static GLFWcursor*          g_MouseCursors[ImGuiMouseCursor_COUNT] = {};
+static bool                 g_InstalledCallbacks = false;
+static bool                 g_WantUpdateMonitors = true;
+
+// Chain GLFW callbacks for main viewport: our callbacks will call the user's previously installed callbacks, if any.
+static GLFWmousebuttonfun   g_PrevUserCallbackMousebutton = NULL;
+static GLFWscrollfun        g_PrevUserCallbackScroll = NULL;
+static GLFWkeyfun           g_PrevUserCallbackKey = NULL;
+static GLFWcharfun          g_PrevUserCallbackChar = NULL;
+static GLFWmonitorfun       g_PrevUserCallbackMonitor = NULL;
+
+// Forward Declarations
+static void ImGui_ImplGlfw_UpdateMonitors();
+static void ImGui_ImplGlfw_InitPlatformInterface();
+static void ImGui_ImplGlfw_ShutdownPlatformInterface();
+
+static const char* ImGui_ImplGlfw_GetClipboardText(void* user_data)
+{
+    return glfwGetClipboardString((GLFWwindow*)user_data);
+}
+
+static void ImGui_ImplGlfw_SetClipboardText(void* user_data, const char* text)
+{
+    glfwSetClipboardString((GLFWwindow*)user_data, text);
+}
+
+void ImGui_ImplGlfw_MouseButtonCallback(GLFWwindow* window, int button, int action, int mods)
+{
+    if (g_PrevUserCallbackMousebutton != NULL && window == g_Window)
+        g_PrevUserCallbackMousebutton(window, button, action, mods);
+
+    if (action == GLFW_PRESS && button >= 0 && button < IM_ARRAYSIZE(g_MouseJustPressed))
+        g_MouseJustPressed[button] = true;
+}
+
+void ImGui_ImplGlfw_ScrollCallback(GLFWwindow* window, double xoffset, double yoffset)
+{
+    if (g_PrevUserCallbackScroll != NULL && window == g_Window)
+        g_PrevUserCallbackScroll(window, xoffset, yoffset);
+
+    ImGuiIO& io = ImGui::GetIO();
+    io.MouseWheelH += (float)xoffset;
+    io.MouseWheel += (float)yoffset;
+}
+
+void ImGui_ImplGlfw_KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mods)
+{
+    if (g_PrevUserCallbackKey != NULL && window == g_Window)
+        g_PrevUserCallbackKey(window, key, scancode, action, mods);
+
+    ImGuiIO& io = ImGui::GetIO();
+    if (action == GLFW_PRESS)
+        io.KeysDown[key] = true;
+    if (action == GLFW_RELEASE)
+        io.KeysDown[key] = false;
+
+    // Modifiers are not reliable across systems
+    io.KeyCtrl = io.KeysDown[GLFW_KEY_LEFT_CONTROL] || io.KeysDown[GLFW_KEY_RIGHT_CONTROL];
+    io.KeyShift = io.KeysDown[GLFW_KEY_LEFT_SHIFT] || io.KeysDown[GLFW_KEY_RIGHT_SHIFT];
+    io.KeyAlt = io.KeysDown[GLFW_KEY_LEFT_ALT] || io.KeysDown[GLFW_KEY_RIGHT_ALT];
+#ifdef _WIN32
+    io.KeySuper = false;
+#else
+    io.KeySuper = io.KeysDown[GLFW_KEY_LEFT_SUPER] || io.KeysDown[GLFW_KEY_RIGHT_SUPER];
+#endif
+}
+
+void ImGui_ImplGlfw_CharCallback(GLFWwindow* window, unsigned int c)
+{
+    if (g_PrevUserCallbackChar != NULL && window == g_Window)
+        g_PrevUserCallbackChar(window, c);
+
+    ImGuiIO& io = ImGui::GetIO();
+    io.AddInputCharacter(c);
+}
+
+void ImGui_ImplGlfw_MonitorCallback(GLFWmonitor*, int)
+{
+    g_WantUpdateMonitors = true;
+}
+
+static bool ImGui_ImplGlfw_Init(GLFWwindow* window, bool install_callbacks, GlfwClientApi client_api)
+{
+    g_Window = window;
+    g_Time = 0.0;
+
+    // Setup backend capabilities flags
+    ImGuiIO& io = ImGui::GetIO();
+    io.BackendFlags |= ImGuiBackendFlags_HasMouseCursors;         // We can honor GetMouseCursor() values (optional)
+    io.BackendFlags |= ImGuiBackendFlags_HasSetMousePos;          // We can honor io.WantSetMousePos requests (optional, rarely used)
+    io.BackendFlags |= ImGuiBackendFlags_PlatformHasViewports;    // We can create multi-viewports on the Platform side (optional)
+#if GLFW_HAS_MOUSE_PASSTHROUGH || (GLFW_HAS_WINDOW_HOVERED && defined(_WIN32))
+    io.BackendFlags |= ImGuiBackendFlags_HasMouseHoveredViewport; // We can set io.MouseHoveredViewport correctly (optional, not easy)
+#endif
+    io.BackendPlatformName = "imgui_impl_glfw";
+
+    // Keyboard mapping. ImGui will use those indices to peek into the io.KeysDown[] array.
+    io.KeyMap[ImGuiKey_Tab] = GLFW_KEY_TAB;
+    io.KeyMap[ImGuiKey_LeftArrow] = GLFW_KEY_LEFT;
+    io.KeyMap[ImGuiKey_RightArrow] = GLFW_KEY_RIGHT;
+    io.KeyMap[ImGuiKey_UpArrow] = GLFW_KEY_UP;
+    io.KeyMap[ImGuiKey_DownArrow] = GLFW_KEY_DOWN;
+    io.KeyMap[ImGuiKey_PageUp] = GLFW_KEY_PAGE_UP;
+    io.KeyMap[ImGuiKey_PageDown] = GLFW_KEY_PAGE_DOWN;
+    io.KeyMap[ImGuiKey_Home] = GLFW_KEY_HOME;
+    io.KeyMap[ImGuiKey_End] = GLFW_KEY_END;
+    io.KeyMap[ImGuiKey_Insert] = GLFW_KEY_INSERT;
+    io.KeyMap[ImGuiKey_Delete] = GLFW_KEY_DELETE;
+    io.KeyMap[ImGuiKey_Backspace] = GLFW_KEY_BACKSPACE;
+    io.KeyMap[ImGuiKey_Space] = GLFW_KEY_SPACE;
+    io.KeyMap[ImGuiKey_Enter] = GLFW_KEY_ENTER;
+    io.KeyMap[ImGuiKey_Escape] = GLFW_KEY_ESCAPE;
+    io.KeyMap[ImGuiKey_KeyPadEnter] = GLFW_KEY_KP_ENTER;
+    io.KeyMap[ImGuiKey_A] = GLFW_KEY_A;
+    io.KeyMap[ImGuiKey_C] = GLFW_KEY_C;
+    io.KeyMap[ImGuiKey_V] = GLFW_KEY_V;
+    io.KeyMap[ImGuiKey_X] = GLFW_KEY_X;
+    io.KeyMap[ImGuiKey_Y] = GLFW_KEY_Y;
+    io.KeyMap[ImGuiKey_Z] = GLFW_KEY_Z;
+
+    io.SetClipboardTextFn = ImGui_ImplGlfw_SetClipboardText;
+    io.GetClipboardTextFn = ImGui_ImplGlfw_GetClipboardText;
+    io.ClipboardUserData = g_Window;
+
+    // Create mouse cursors
+    // (By design, on X11 cursors are user configurable and some cursors may be missing. When a cursor doesn't exist,
+    // GLFW will emit an error which will often be printed by the app, so we temporarily disable error reporting.
+    // Missing cursors will return NULL and our _UpdateMouseCursor() function will use the Arrow cursor instead.)
+    GLFWerrorfun prev_error_callback = glfwSetErrorCallback(NULL);
+    g_MouseCursors[ImGuiMouseCursor_Arrow] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_TextInput] = glfwCreateStandardCursor(GLFW_IBEAM_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_ResizeNS] = glfwCreateStandardCursor(GLFW_VRESIZE_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_ResizeEW] = glfwCreateStandardCursor(GLFW_HRESIZE_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_Hand] = glfwCreateStandardCursor(GLFW_HAND_CURSOR);
+#if GLFW_HAS_NEW_CURSORS
+    g_MouseCursors[ImGuiMouseCursor_ResizeAll] = glfwCreateStandardCursor(GLFW_RESIZE_ALL_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = glfwCreateStandardCursor(GLFW_RESIZE_NESW_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_RESIZE_NWSE_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_NotAllowed] = glfwCreateStandardCursor(GLFW_NOT_ALLOWED_CURSOR);
+#else
+    g_MouseCursors[ImGuiMouseCursor_ResizeAll] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_ResizeNESW] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_ResizeNWSE] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
+    g_MouseCursors[ImGuiMouseCursor_NotAllowed] = glfwCreateStandardCursor(GLFW_ARROW_CURSOR);
+#endif
+    glfwSetErrorCallback(prev_error_callback);
+
+    // Chain GLFW callbacks: our callbacks will call the user's previously installed callbacks, if any.
+    g_PrevUserCallbackMousebutton = NULL;
+    g_PrevUserCallbackScroll = NULL;
+    g_PrevUserCallbackKey = NULL;
+    g_PrevUserCallbackChar = NULL;
+    g_PrevUserCallbackMonitor = NULL;
+    if (install_callbacks)
+    {
+        g_InstalledCallbacks = true;
+        g_PrevUserCallbackMousebutton = glfwSetMouseButtonCallback(window, ImGui_ImplGlfw_MouseButtonCallback);
+        g_PrevUserCallbackScroll = glfwSetScrollCallback(window, ImGui_ImplGlfw_ScrollCallback);
+        g_PrevUserCallbackKey = glfwSetKeyCallback(window, ImGui_ImplGlfw_KeyCallback);
+        g_PrevUserCallbackChar = glfwSetCharCallback(window, ImGui_ImplGlfw_CharCallback);
+        g_PrevUserCallbackMonitor = glfwSetMonitorCallback(ImGui_ImplGlfw_MonitorCallback);
+    }
+
+    // Update monitors the first time (note: monitor callback are broken in GLFW 3.2 and earlier, see github.com/glfw/glfw/issues/784)
+    ImGui_ImplGlfw_UpdateMonitors();
+    glfwSetMonitorCallback(ImGui_ImplGlfw_MonitorCallback);
+
+    // Our mouse update function expect PlatformHandle to be filled for the main viewport
+    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
+    main_viewport->PlatformHandle = (void*)g_Window;
+#ifdef _WIN32
+    main_viewport->PlatformHandleRaw = glfwGetWin32Window(g_Window);
+#endif
+    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImGui_ImplGlfw_InitPlatformInterface();
+
+    g_ClientApi = client_api;
+    return true;
+}
+
+bool ImGui_ImplGlfw_InitForOpenGL(GLFWwindow* window, bool install_callbacks)
+{
+    return ImGui_ImplGlfw_Init(window, install_callbacks, GlfwClientApi_OpenGL);
+}
+
+bool ImGui_ImplGlfw_InitForVulkan(GLFWwindow* window, bool install_callbacks)
+{
+    return ImGui_ImplGlfw_Init(window, install_callbacks, GlfwClientApi_Vulkan);
+}
+
+void ImGui_ImplGlfw_Shutdown()
+{
+    ImGui_ImplGlfw_ShutdownPlatformInterface();
+
+    if (g_InstalledCallbacks)
+    {
+        glfwSetMouseButtonCallback(g_Window, g_PrevUserCallbackMousebutton);
+        glfwSetScrollCallback(g_Window, g_PrevUserCallbackScroll);
+        glfwSetKeyCallback(g_Window, g_PrevUserCallbackKey);
+        glfwSetCharCallback(g_Window, g_PrevUserCallbackChar);
+        g_InstalledCallbacks = false;
+    }
+
+    for (ImGuiMouseCursor cursor_n = 0; cursor_n < ImGuiMouseCursor_COUNT; cursor_n++)
+    {
+        glfwDestroyCursor(g_MouseCursors[cursor_n]);
+        g_MouseCursors[cursor_n] = NULL;
+    }
+    g_ClientApi = GlfwClientApi_Unknown;
+}
+
+static void ImGui_ImplGlfw_UpdateMousePosAndButtons()
+{
+    // Update buttons
+    ImGuiIO& io = ImGui::GetIO();
+    for (int i = 0; i < IM_ARRAYSIZE(io.MouseDown); i++)
+    {
+        // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
+        io.MouseDown[i] = g_MouseJustPressed[i] || glfwGetMouseButton(g_Window, i) != 0;
+        g_MouseJustPressed[i] = false;
+    }
+
+    // Update mouse position
+    const ImVec2 mouse_pos_backup = io.MousePos;
+    io.MousePos = ImVec2(-FLT_MAX, -FLT_MAX);
+    io.MouseHoveredViewport = 0;
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    for (int n = 0; n < platform_io.Viewports.Size; n++)
+    {
+        ImGuiViewport* viewport = platform_io.Viewports[n];
+        GLFWwindow* window = (GLFWwindow*)viewport->PlatformHandle;
+        IM_ASSERT(window != NULL);
+#ifdef __EMSCRIPTEN__
+        const bool focused = true;
+        IM_ASSERT(platform_io.Viewports.Size == 1);
+#else
+        const bool focused = glfwGetWindowAttrib(window, GLFW_FOCUSED) != 0;
+#endif
+        if (focused)
+        {
+            if (io.WantSetMousePos)
+            {
+                glfwSetCursorPos(window, (double)(mouse_pos_backup.x - viewport->Pos.x), (double)(mouse_pos_backup.y - viewport->Pos.y));
+            }
+            else
+            {
+                double mouse_x, mouse_y;
+                glfwGetCursorPos(window, &mouse_x, &mouse_y);
+                if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+                {
+                    // Multi-viewport mode: mouse position in OS absolute coordinates (io.MousePos is (0,0) when the mouse is on the upper-left of the primary monitor)
+                    int window_x, window_y;
+                    glfwGetWindowPos(window, &window_x, &window_y);
+                    io.MousePos = ImVec2((float)mouse_x + window_x, (float)mouse_y + window_y);
+                }
+                else
+                {
+                    // Single viewport mode: mouse position in client window coordinates (io.MousePos is (0,0) when the mouse is on the upper-left corner of the app window)
+                    io.MousePos = ImVec2((float)mouse_x, (float)mouse_y);
+                }
+            }
+            for (int i = 0; i < IM_ARRAYSIZE(io.MouseDown); i++)
+                io.MouseDown[i] |= glfwGetMouseButton(window, i) != 0;
+        }
+
+        // (Optional) When using multiple viewports: set io.MouseHoveredViewport to the viewport the OS mouse cursor is hovering.
+        // Important: this information is not easy to provide and many high-level windowing library won't be able to provide it correctly, because
+        // - This is _ignoring_ viewports with the ImGuiViewportFlags_NoInputs flag (pass-through windows).
+        // - This is _regardless_ of whether another viewport is focused or being dragged from.
+        // If ImGuiBackendFlags_HasMouseHoveredViewport is not set by the backend, imgui will ignore this field and infer the information by relying on the
+        // rectangles and last focused time of every viewports it knows about. It will be unaware of other windows that may be sitting between or over your windows.
+        // [GLFW] FIXME: This is currently only correct on Win32. See what we do below with the WM_NCHITTEST, missing an equivalent for other systems.
+        // See https://github.com/glfw/glfw/issues/1236 if you want to help in making this a GLFW feature.
+#if GLFW_HAS_MOUSE_PASSTHROUGH || (GLFW_HAS_WINDOW_HOVERED && defined(_WIN32))
+        const bool window_no_input = (viewport->Flags & ImGuiViewportFlags_NoInputs) != 0;
+#if GLFW_HAS_MOUSE_PASSTHROUGH
+        glfwSetWindowAttrib(window, GLFW_MOUSE_PASSTHROUGH, window_no_input);
+#endif
+        if (glfwGetWindowAttrib(window, GLFW_HOVERED) && !window_no_input)
+            io.MouseHoveredViewport = viewport->ID;
+#endif
+    }
+}
+
+static void ImGui_ImplGlfw_UpdateMouseCursor()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    if ((io.ConfigFlags & ImGuiConfigFlags_NoMouseCursorChange) || glfwGetInputMode(g_Window, GLFW_CURSOR) == GLFW_CURSOR_DISABLED)
+        return;
+
+    ImGuiMouseCursor imgui_cursor = ImGui::GetMouseCursor();
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    for (int n = 0; n < platform_io.Viewports.Size; n++)
+    {
+        GLFWwindow* window = (GLFWwindow*)platform_io.Viewports[n]->PlatformHandle;
+        if (imgui_cursor == ImGuiMouseCursor_None || io.MouseDrawCursor)
+        {
+            // Hide OS mouse cursor if imgui is drawing it or if it wants no cursor
+            glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
+        }
+        else
+        {
+            // Show OS mouse cursor
+            // FIXME-PLATFORM: Unfocused windows seems to fail changing the mouse cursor with GLFW 3.2, but 3.3 works here.
+            glfwSetCursor(window, g_MouseCursors[imgui_cursor] ? g_MouseCursors[imgui_cursor] : g_MouseCursors[ImGuiMouseCursor_Arrow]);
+            glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
+        }
+    }
+}
+
+static void ImGui_ImplGlfw_UpdateGamepads()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    memset(io.NavInputs, 0, sizeof(io.NavInputs));
+    if ((io.ConfigFlags & ImGuiConfigFlags_NavEnableGamepad) == 0)
+        return;
+
+    // Update gamepad inputs
+    #define MAP_BUTTON(NAV_NO, BUTTON_NO)       { if (buttons_count > BUTTON_NO && buttons[BUTTON_NO] == GLFW_PRESS) io.NavInputs[NAV_NO] = 1.0f; }
+    #define MAP_ANALOG(NAV_NO, AXIS_NO, V0, V1) { float v = (axes_count > AXIS_NO) ? axes[AXIS_NO] : V0; v = (v - V0) / (V1 - V0); if (v > 1.0f) v = 1.0f; if (io.NavInputs[NAV_NO] < v) io.NavInputs[NAV_NO] = v; }
+    int axes_count = 0, buttons_count = 0;
+    const float* axes = glfwGetJoystickAxes(GLFW_JOYSTICK_1, &axes_count);
+    const unsigned char* buttons = glfwGetJoystickButtons(GLFW_JOYSTICK_1, &buttons_count);
+    MAP_BUTTON(ImGuiNavInput_Activate,   0);     // Cross / A
+    MAP_BUTTON(ImGuiNavInput_Cancel,     1);     // Circle / B
+    MAP_BUTTON(ImGuiNavInput_Menu,       2);     // Square / X
+    MAP_BUTTON(ImGuiNavInput_Input,      3);     // Triangle / Y
+    MAP_BUTTON(ImGuiNavInput_DpadLeft,   13);    // D-Pad Left
+    MAP_BUTTON(ImGuiNavInput_DpadRight,  11);    // D-Pad Right
+    MAP_BUTTON(ImGuiNavInput_DpadUp,     10);    // D-Pad Up
+    MAP_BUTTON(ImGuiNavInput_DpadDown,   12);    // D-Pad Down
+    MAP_BUTTON(ImGuiNavInput_FocusPrev,  4);     // L1 / LB
+    MAP_BUTTON(ImGuiNavInput_FocusNext,  5);     // R1 / RB
+    MAP_BUTTON(ImGuiNavInput_TweakSlow,  4);     // L1 / LB
+    MAP_BUTTON(ImGuiNavInput_TweakFast,  5);     // R1 / RB
+    MAP_ANALOG(ImGuiNavInput_LStickLeft, 0,  -0.3f,  -0.9f);
+    MAP_ANALOG(ImGuiNavInput_LStickRight,0,  +0.3f,  +0.9f);
+    MAP_ANALOG(ImGuiNavInput_LStickUp,   1,  +0.3f,  +0.9f);
+    MAP_ANALOG(ImGuiNavInput_LStickDown, 1,  -0.3f,  -0.9f);
+    #undef MAP_BUTTON
+    #undef MAP_ANALOG
+    if (axes_count > 0 && buttons_count > 0)
+        io.BackendFlags |= ImGuiBackendFlags_HasGamepad;
+    else
+        io.BackendFlags &= ~ImGuiBackendFlags_HasGamepad;
+}
+
+static void ImGui_ImplGlfw_UpdateMonitors()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    int monitors_count = 0;
+    GLFWmonitor** glfw_monitors = glfwGetMonitors(&monitors_count);
+    platform_io.Monitors.resize(0);
+    for (int n = 0; n < monitors_count; n++)
+    {
+        ImGuiPlatformMonitor monitor;
+        int x, y;
+        glfwGetMonitorPos(glfw_monitors[n], &x, &y);
+        const GLFWvidmode* vid_mode = glfwGetVideoMode(glfw_monitors[n]);
+        monitor.MainPos = monitor.WorkPos = ImVec2((float)x, (float)y);
+        monitor.MainSize = monitor.WorkSize = ImVec2((float)vid_mode->width, (float)vid_mode->height);
+#if GLFW_HAS_MONITOR_WORK_AREA
+        int w, h;
+        glfwGetMonitorWorkarea(glfw_monitors[n], &x, &y, &w, &h);
+        if (w > 0 && h > 0) // Workaround a small GLFW issue reporting zero on monitor changes: https://github.com/glfw/glfw/pull/1761
+        {
+            monitor.WorkPos = ImVec2((float)x, (float)y);
+            monitor.WorkSize = ImVec2((float)w, (float)h);
+        }
+#endif
+#if GLFW_HAS_PER_MONITOR_DPI
+        // Warning: the validity of monitor DPI information on Windows depends on the application DPI awareness settings, which generally needs to be set in the manifest or at runtime.
+        float x_scale, y_scale;
+        glfwGetMonitorContentScale(glfw_monitors[n], &x_scale, &y_scale);
+        monitor.DpiScale = x_scale;
+#endif
+        platform_io.Monitors.push_back(monitor);
+    }
+    g_WantUpdateMonitors = false;
+}
+
+void ImGui_ImplGlfw_NewFrame()
+{
+    ImGuiIO& io = ImGui::GetIO();
+    IM_ASSERT(io.Fonts->IsBuilt() && "Font atlas not built! It is generally built by the renderer backend. Missing call to renderer _NewFrame() function? e.g. ImGui_ImplOpenGL3_NewFrame().");
+
+    // Setup display size (every frame to accommodate for window resizing)
+    int w, h;
+    int display_w, display_h;
+    glfwGetWindowSize(g_Window, &w, &h);
+    glfwGetFramebufferSize(g_Window, &display_w, &display_h);
+    io.DisplaySize = ImVec2((float)w, (float)h);
+    if (w > 0 && h > 0)
+        io.DisplayFramebufferScale = ImVec2((float)display_w / w, (float)display_h / h);
+    if (g_WantUpdateMonitors)
+        ImGui_ImplGlfw_UpdateMonitors();
+
+    // Setup time step
+    double current_time = glfwGetTime();
+    io.DeltaTime = g_Time > 0.0 ? (float)(current_time - g_Time) : (float)(1.0f / 60.0f);
+    g_Time = current_time;
+
+    ImGui_ImplGlfw_UpdateMousePosAndButtons();
+    ImGui_ImplGlfw_UpdateMouseCursor();
+
+    // Update game controllers (if enabled and available)
+    ImGui_ImplGlfw_UpdateGamepads();
+}
+
+//--------------------------------------------------------------------------------------------------------
+// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
+// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
+// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
+//--------------------------------------------------------------------------------------------------------
+
+// Helper structure we store in the void* RenderUserData field of each ImGuiViewport to easily retrieve our backend data.
+struct ImGuiViewportDataGlfw
+{
+    GLFWwindow* Window;
+    bool        WindowOwned;
+    int         IgnoreWindowPosEventFrame;
+    int         IgnoreWindowSizeEventFrame;
+
+    ImGuiViewportDataGlfw()  { Window = NULL; WindowOwned = false; IgnoreWindowSizeEventFrame = IgnoreWindowPosEventFrame = -1; }
+    ~ImGuiViewportDataGlfw() { IM_ASSERT(Window == NULL); }
+};
+
+static void ImGui_ImplGlfw_WindowCloseCallback(GLFWwindow* window)
+{
+    if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle(window))
+        viewport->PlatformRequestClose = true;
+}
+
+// GLFW may dispatch window pos/size events after calling glfwSetWindowPos()/glfwSetWindowSize().
+// However: depending on the platform the callback may be invoked at different time:
+// - on Windows it appears to be called within the glfwSetWindowPos()/glfwSetWindowSize() call
+// - on Linux it is queued and invoked during glfwPollEvents()
+// Because the event doesn't always fire on glfwSetWindowXXX() we use a frame counter tag to only
+// ignore recent glfwSetWindowXXX() calls.
+static void ImGui_ImplGlfw_WindowPosCallback(GLFWwindow* window, int, int)
+{
+    if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle(window))
+    {
+        if (ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData)
+        {
+            bool ignore_event = (ImGui::GetFrameCount() <= data->IgnoreWindowPosEventFrame + 1);
+            //data->IgnoreWindowPosEventFrame = -1;
+            if (ignore_event)
+                return;
+        }
+        viewport->PlatformRequestMove = true;
+    }
+}
+
+static void ImGui_ImplGlfw_WindowSizeCallback(GLFWwindow* window, int, int)
+{
+    if (ImGuiViewport* viewport = ImGui::FindViewportByPlatformHandle(window))
+    {
+        if (ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData)
+        {
+            bool ignore_event = (ImGui::GetFrameCount() <= data->IgnoreWindowSizeEventFrame + 1);
+            //data->IgnoreWindowSizeEventFrame = -1;
+            if (ignore_event)
+                return;
+        }
+        viewport->PlatformRequestResize = true;
+    }
+}
+
+static void ImGui_ImplGlfw_CreateWindow(ImGuiViewport* viewport)
+{
+    ImGuiViewportDataGlfw* data = IM_NEW(ImGuiViewportDataGlfw)();
+    viewport->PlatformUserData = data;
+
+    // GLFW 3.2 unfortunately always set focus on glfwCreateWindow() if GLFW_VISIBLE is set, regardless of GLFW_FOCUSED
+    // With GLFW 3.3, the hint GLFW_FOCUS_ON_SHOW fixes this problem
+    glfwWindowHint(GLFW_VISIBLE, false);
+    glfwWindowHint(GLFW_FOCUSED, false);
+#if GLFW_HAS_FOCUS_ON_SHOW
+     glfwWindowHint(GLFW_FOCUS_ON_SHOW, false);
+ #endif
+    glfwWindowHint(GLFW_DECORATED, (viewport->Flags & ImGuiViewportFlags_NoDecoration) ? false : true);
+#if GLFW_HAS_WINDOW_TOPMOST
+    glfwWindowHint(GLFW_FLOATING, (viewport->Flags & ImGuiViewportFlags_TopMost) ? true : false);
+#endif
+    GLFWwindow* share_window = (g_ClientApi == GlfwClientApi_OpenGL) ? g_Window : NULL;
+    data->Window = glfwCreateWindow((int)viewport->Size.x, (int)viewport->Size.y, "No Title Yet", NULL, share_window);
+    data->WindowOwned = true;
+    viewport->PlatformHandle = (void*)data->Window;
+#ifdef _WIN32
+    viewport->PlatformHandleRaw = glfwGetWin32Window(data->Window);
+#endif
+    glfwSetWindowPos(data->Window, (int)viewport->Pos.x, (int)viewport->Pos.y);
+
+    // Install GLFW callbacks for secondary viewports
+    glfwSetMouseButtonCallback(data->Window, ImGui_ImplGlfw_MouseButtonCallback);
+    glfwSetScrollCallback(data->Window, ImGui_ImplGlfw_ScrollCallback);
+    glfwSetKeyCallback(data->Window, ImGui_ImplGlfw_KeyCallback);
+    glfwSetCharCallback(data->Window, ImGui_ImplGlfw_CharCallback);
+    glfwSetWindowCloseCallback(data->Window, ImGui_ImplGlfw_WindowCloseCallback);
+    glfwSetWindowPosCallback(data->Window, ImGui_ImplGlfw_WindowPosCallback);
+    glfwSetWindowSizeCallback(data->Window, ImGui_ImplGlfw_WindowSizeCallback);
+    if (g_ClientApi == GlfwClientApi_OpenGL)
+    {
+        glfwMakeContextCurrent(data->Window);
+        glfwSwapInterval(0);
+    }
+}
+
+static void ImGui_ImplGlfw_DestroyWindow(ImGuiViewport* viewport)
+{
+    if (ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData)
+    {
+        if (data->WindowOwned)
+        {
+#if !GLFW_HAS_MOUSE_PASSTHROUGH && GLFW_HAS_WINDOW_HOVERED && defined(_WIN32)
+            HWND hwnd = (HWND)viewport->PlatformHandleRaw;
+            ::RemovePropA(hwnd, "IMGUI_VIEWPORT");
+#endif
+            glfwDestroyWindow(data->Window);
+        }
+        data->Window = NULL;
+        IM_DELETE(data);
+    }
+    viewport->PlatformUserData = viewport->PlatformHandle = NULL;
+}
+
+// We have submitted https://github.com/glfw/glfw/pull/1568 to allow GLFW to support "transparent inputs".
+// In the meanwhile we implement custom per-platform workarounds here (FIXME-VIEWPORT: Implement same work-around for Linux/OSX!)
+#if !GLFW_HAS_MOUSE_PASSTHROUGH && GLFW_HAS_WINDOW_HOVERED && defined(_WIN32)
+static WNDPROC g_GlfwWndProc = NULL;
+static LRESULT CALLBACK WndProcNoInputs(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
+{
+    if (msg == WM_NCHITTEST)
+    {
+        // Let mouse pass-through the window. This will allow the backend to set io.MouseHoveredViewport properly (which is OPTIONAL).
+        // The ImGuiViewportFlags_NoInputs flag is set while dragging a viewport, as want to detect the window behind the one we are dragging.
+        // If you cannot easily access those viewport flags from your windowing/event code: you may manually synchronize its state e.g. in
+        // your main loop after calling UpdatePlatformWindows(). Iterate all viewports/platform windows and pass the flag to your windowing system.
+        ImGuiViewport* viewport = (ImGuiViewport*)::GetPropA(hWnd, "IMGUI_VIEWPORT");
+        if (viewport->Flags & ImGuiViewportFlags_NoInputs)
+            return HTTRANSPARENT;
+    }
+    return ::CallWindowProc(g_GlfwWndProc, hWnd, msg, wParam, lParam);
+}
+#endif
+
+static void ImGui_ImplGlfw_ShowWindow(ImGuiViewport* viewport)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+
+#if defined(_WIN32)
+    // GLFW hack: Hide icon from task bar
+    HWND hwnd = (HWND)viewport->PlatformHandleRaw;
+    if (viewport->Flags & ImGuiViewportFlags_NoTaskBarIcon)
+    {
+        LONG ex_style = ::GetWindowLong(hwnd, GWL_EXSTYLE);
+        ex_style &= ~WS_EX_APPWINDOW;
+        ex_style |= WS_EX_TOOLWINDOW;
+        ::SetWindowLong(hwnd, GWL_EXSTYLE, ex_style);
+    }
+
+    // GLFW hack: install hook for WM_NCHITTEST message handler
+#if !GLFW_HAS_MOUSE_PASSTHROUGH && GLFW_HAS_WINDOW_HOVERED && defined(_WIN32)
+    ::SetPropA(hwnd, "IMGUI_VIEWPORT", viewport);
+    if (g_GlfwWndProc == NULL)
+        g_GlfwWndProc = (WNDPROC)::GetWindowLongPtr(hwnd, GWLP_WNDPROC);
+    ::SetWindowLongPtr(hwnd, GWLP_WNDPROC, (LONG_PTR)WndProcNoInputs);
+#endif
+
+#if !GLFW_HAS_FOCUS_ON_SHOW
+    // GLFW hack: GLFW 3.2 has a bug where glfwShowWindow() also activates/focus the window.
+    // The fix was pushed to GLFW repository on 2018/01/09 and should be included in GLFW 3.3 via a GLFW_FOCUS_ON_SHOW window attribute.
+    // See https://github.com/glfw/glfw/issues/1189
+    // FIXME-VIEWPORT: Implement same work-around for Linux/OSX in the meanwhile.
+    if (viewport->Flags & ImGuiViewportFlags_NoFocusOnAppearing)
+    {
+        ::ShowWindow(hwnd, SW_SHOWNA);
+        return;
+    }
+#endif
+#endif
+
+    glfwShowWindow(data->Window);
+}
+
+static ImVec2 ImGui_ImplGlfw_GetWindowPos(ImGuiViewport* viewport)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    int x = 0, y = 0;
+    glfwGetWindowPos(data->Window, &x, &y);
+    return ImVec2((float)x, (float)y);
+}
+
+static void ImGui_ImplGlfw_SetWindowPos(ImGuiViewport* viewport, ImVec2 pos)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    data->IgnoreWindowPosEventFrame = ImGui::GetFrameCount();
+    glfwSetWindowPos(data->Window, (int)pos.x, (int)pos.y);
+}
+
+static ImVec2 ImGui_ImplGlfw_GetWindowSize(ImGuiViewport* viewport)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    int w = 0, h = 0;
+    glfwGetWindowSize(data->Window, &w, &h);
+    return ImVec2((float)w, (float)h);
+}
+
+static void ImGui_ImplGlfw_SetWindowSize(ImGuiViewport* viewport, ImVec2 size)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+#if __APPLE__ && !GLFW_HAS_OSX_WINDOW_POS_FIX
+    // Native OS windows are positioned from the bottom-left corner on macOS, whereas on other platforms they are
+    // positioned from the upper-left corner. GLFW makes an effort to convert macOS style coordinates, however it
+    // doesn't handle it when changing size. We are manually moving the window in order for changes of size to be based
+    // on the upper-left corner.
+    int x, y, width, height;
+    glfwGetWindowPos(data->Window, &x, &y);
+    glfwGetWindowSize(data->Window, &width, &height);
+    glfwSetWindowPos(data->Window, x, y - height + size.y);
+#endif
+    data->IgnoreWindowSizeEventFrame = ImGui::GetFrameCount();
+    glfwSetWindowSize(data->Window, (int)size.x, (int)size.y);
+}
+
+static void ImGui_ImplGlfw_SetWindowTitle(ImGuiViewport* viewport, const char* title)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    glfwSetWindowTitle(data->Window, title);
+}
+
+static void ImGui_ImplGlfw_SetWindowFocus(ImGuiViewport* viewport)
+{
+#if GLFW_HAS_FOCUS_WINDOW
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    glfwFocusWindow(data->Window);
+#else
+    // FIXME: What are the effect of not having this function? At the moment imgui doesn't actually call SetWindowFocus - we set that up ahead, will answer that question later.
+    (void)viewport;
+#endif
+}
+
+static bool ImGui_ImplGlfw_GetWindowFocus(ImGuiViewport* viewport)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    return glfwGetWindowAttrib(data->Window, GLFW_FOCUSED) != 0;
+}
+
+static bool ImGui_ImplGlfw_GetWindowMinimized(ImGuiViewport* viewport)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    return glfwGetWindowAttrib(data->Window, GLFW_ICONIFIED) != 0;
+}
+
+#if GLFW_HAS_WINDOW_ALPHA
+static void ImGui_ImplGlfw_SetWindowAlpha(ImGuiViewport* viewport, float alpha)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    glfwSetWindowOpacity(data->Window, alpha);
+}
+#endif
+
+static void ImGui_ImplGlfw_RenderWindow(ImGuiViewport* viewport, void*)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    if (g_ClientApi == GlfwClientApi_OpenGL)
+        glfwMakeContextCurrent(data->Window);
+}
+
+static void ImGui_ImplGlfw_SwapBuffers(ImGuiViewport* viewport, void*)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    if (g_ClientApi == GlfwClientApi_OpenGL)
+    {
+        glfwMakeContextCurrent(data->Window);
+        glfwSwapBuffers(data->Window);
+    }
+}
+
+//--------------------------------------------------------------------------------------------------------
+// IME (Input Method Editor) basic support for e.g. Asian language users
+//--------------------------------------------------------------------------------------------------------
+
+// We provide a Win32 implementation because this is such a common issue for IME users
+#if defined(_WIN32) && !defined(IMGUI_DISABLE_WIN32_FUNCTIONS) && !defined(IMGUI_DISABLE_WIN32_DEFAULT_IME_FUNCTIONS) && !defined(__GNUC__)
+#define HAS_WIN32_IME   1
+#include <imm.h>
+#ifdef _MSC_VER
+#pragma comment(lib, "imm32")
+#endif
+static void ImGui_ImplWin32_SetImeInputPos(ImGuiViewport* viewport, ImVec2 pos)
+{
+    COMPOSITIONFORM cf = { CFS_FORCE_POSITION, { (LONG)(pos.x - viewport->Pos.x), (LONG)(pos.y - viewport->Pos.y) }, { 0, 0, 0, 0 } };
+    if (HWND hwnd = (HWND)viewport->PlatformHandleRaw)
+        if (HIMC himc = ::ImmGetContext(hwnd))
+        {
+            ::ImmSetCompositionWindow(himc, &cf);
+            ::ImmReleaseContext(hwnd, himc);
+        }
+}
+#else
+#define HAS_WIN32_IME   0
+#endif
+
+//--------------------------------------------------------------------------------------------------------
+// Vulkan support (the Vulkan renderer needs to call a platform-side support function to create the surface)
+//--------------------------------------------------------------------------------------------------------
+
+// Avoid including <vulkan.h> so we can build without it
+#if GLFW_HAS_VULKAN
+#ifndef VULKAN_H_
+#define VK_DEFINE_HANDLE(object) typedef struct object##_T* object;
+#if defined(__LP64__) || defined(_WIN64) || defined(__x86_64__) || defined(_M_X64) || defined(__ia64) || defined (_M_IA64) || defined(__aarch64__) || defined(__powerpc64__)
+#define VK_DEFINE_NON_DISPATCHABLE_HANDLE(object) typedef struct object##_T *object;
+#else
+#define VK_DEFINE_NON_DISPATCHABLE_HANDLE(object) typedef uint64_t object;
+#endif
+VK_DEFINE_HANDLE(VkInstance)
+VK_DEFINE_NON_DISPATCHABLE_HANDLE(VkSurfaceKHR)
+struct VkAllocationCallbacks;
+enum VkResult { VK_RESULT_MAX_ENUM = 0x7FFFFFFF };
+#endif // VULKAN_H_
+extern "C" { extern GLFWAPI VkResult glfwCreateWindowSurface(VkInstance instance, GLFWwindow* window, const VkAllocationCallbacks* allocator, VkSurfaceKHR* surface); }
+static int ImGui_ImplGlfw_CreateVkSurface(ImGuiViewport* viewport, ImU64 vk_instance, const void* vk_allocator, ImU64* out_vk_surface)
+{
+    ImGuiViewportDataGlfw* data = (ImGuiViewportDataGlfw*)viewport->PlatformUserData;
+    IM_ASSERT(g_ClientApi == GlfwClientApi_Vulkan);
+    VkResult err = glfwCreateWindowSurface((VkInstance)vk_instance, data->Window, (const VkAllocationCallbacks*)vk_allocator, (VkSurfaceKHR*)out_vk_surface);
+    return (int)err;
+}
+#endif // GLFW_HAS_VULKAN
+
+static void ImGui_ImplGlfw_InitPlatformInterface()
+{
+    // Register platform interface (will be coupled with a renderer interface)
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.Platform_CreateWindow = ImGui_ImplGlfw_CreateWindow;
+    platform_io.Platform_DestroyWindow = ImGui_ImplGlfw_DestroyWindow;
+    platform_io.Platform_ShowWindow = ImGui_ImplGlfw_ShowWindow;
+    platform_io.Platform_SetWindowPos = ImGui_ImplGlfw_SetWindowPos;
+    platform_io.Platform_GetWindowPos = ImGui_ImplGlfw_GetWindowPos;
+    platform_io.Platform_SetWindowSize = ImGui_ImplGlfw_SetWindowSize;
+    platform_io.Platform_GetWindowSize = ImGui_ImplGlfw_GetWindowSize;
+    platform_io.Platform_SetWindowFocus = ImGui_ImplGlfw_SetWindowFocus;
+    platform_io.Platform_GetWindowFocus = ImGui_ImplGlfw_GetWindowFocus;
+    platform_io.Platform_GetWindowMinimized = ImGui_ImplGlfw_GetWindowMinimized;
+    platform_io.Platform_SetWindowTitle = ImGui_ImplGlfw_SetWindowTitle;
+    platform_io.Platform_RenderWindow = ImGui_ImplGlfw_RenderWindow;
+    platform_io.Platform_SwapBuffers = ImGui_ImplGlfw_SwapBuffers;
+#if GLFW_HAS_WINDOW_ALPHA
+    platform_io.Platform_SetWindowAlpha = ImGui_ImplGlfw_SetWindowAlpha;
+#endif
+#if GLFW_HAS_VULKAN
+    platform_io.Platform_CreateVkSurface = ImGui_ImplGlfw_CreateVkSurface;
+#endif
+#if HAS_WIN32_IME
+    platform_io.Platform_SetImeInputPos = ImGui_ImplWin32_SetImeInputPos;
+#endif
+
+    // Register main window handle (which is owned by the main application, not by us)
+    // This is mostly for simplicity and consistency, so that our code (e.g. mouse handling etc.) can use same logic for main and secondary viewports.
+    ImGuiViewport* main_viewport = ImGui::GetMainViewport();
+    ImGuiViewportDataGlfw* data = IM_NEW(ImGuiViewportDataGlfw)();
+    data->Window = g_Window;
+    data->WindowOwned = false;
+    main_viewport->PlatformUserData = data;
+    main_viewport->PlatformHandle = (void*)g_Window;
+}
+
+static void ImGui_ImplGlfw_ShutdownPlatformInterface()
+{
+}

libs/ImGui/source/imgui_impl_opengl3.cpp

@@ -0,0 +1,752 @@
+// dear imgui: Renderer Backend for modern OpenGL with shaders / programmatic pipeline
+// - Desktop GL: 2.x 3.x 4.x
+// - Embedded GL: ES 2.0 (WebGL 1.0), ES 3.0 (WebGL 2.0)
+// This needs to be used along with a Platform Backend (e.g. GLFW, SDL, Win32, custom..)
+
+// Implemented features:
+//  [X] Renderer: User texture binding. Use 'GLuint' OpenGL texture identifier as void*/ImTextureID. Read the FAQ about ImTextureID!
+//  [X] Renderer: Multi-viewport support. Enable with 'io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable'.
+//  [x] Renderer: Desktop GL only: Support for large meshes (64k+ vertices) with 16-bit indices.
+
+// You can copy and use unmodified imgui_impl_* files in your project. See examples/ folder for examples of using this.
+// If you are new to Dear ImGui, read documentation from the docs/ folder + read the top of imgui.cpp.
+// Read online: https://github.com/ocornut/imgui/tree/master/docs
+
+// CHANGELOG
+// (minor and older changes stripped away, please see git history for details)
+//  2020-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2020-10-23: OpenGL: Save and restore current GL_PRIMITIVE_RESTART state.
+//  2020-10-15: OpenGL: Use glGetString(GL_VERSION) instead of glGetIntegerv(GL_MAJOR_VERSION, ...) when the later returns zero (e.g. Desktop GL 2.x)
+//  2020-09-17: OpenGL: Fix to avoid compiling/calling glBindSampler() on ES or pre 3.3 context which have the defines set by a loader.
+//  2020-07-10: OpenGL: Added support for glad2 OpenGL loader.
+//  2020-05-08: OpenGL: Made default GLSL version 150 (instead of 130) on OSX.
+//  2020-04-21: OpenGL: Fixed handling of glClipControl(GL_UPPER_LEFT) by inverting projection matrix.
+//  2020-04-12: OpenGL: Fixed context version check mistakenly testing for 4.0+ instead of 3.2+ to enable ImGuiBackendFlags_RendererHasVtxOffset.
+//  2020-03-24: OpenGL: Added support for glbinding 2.x OpenGL loader.
+//  2020-01-07: OpenGL: Added support for glbinding 3.x OpenGL loader.
+//  2019-10-25: OpenGL: Using a combination of GL define and runtime GL version to decide whether to use glDrawElementsBaseVertex(). Fix building with pre-3.2 GL loaders.
+//  2019-09-22: OpenGL: Detect default GL loader using __has_include compiler facility.
+//  2019-09-16: OpenGL: Tweak initialization code to allow application calling ImGui_ImplOpenGL3_CreateFontsTexture() before the first NewFrame() call.
+//  2019-05-29: OpenGL: Desktop GL only: Added support for large mesh (64K+ vertices), enable ImGuiBackendFlags_RendererHasVtxOffset flag.
+//  2019-04-30: OpenGL: Added support for special ImDrawCallback_ResetRenderState callback to reset render state.
+//  2019-03-29: OpenGL: Not calling glBindBuffer more than necessary in the render loop.
+//  2019-03-15: OpenGL: Added a GL call + comments in ImGui_ImplOpenGL3_Init() to detect uninitialized GL function loaders early.
+//  2019-03-03: OpenGL: Fix support for ES 2.0 (WebGL 1.0).
+//  2019-02-20: OpenGL: Fix for OSX not supporting OpenGL 4.5, we don't try to read GL_CLIP_ORIGIN even if defined by the headers/loader.
+//  2019-02-11: OpenGL: Projecting clipping rectangles correctly using draw_data->FramebufferScale to allow multi-viewports for retina display.
+//  2019-02-01: OpenGL: Using GLSL 410 shaders for any version over 410 (e.g. 430, 450).
+//  2018-11-30: Misc: Setting up io.BackendRendererName so it can be displayed in the About Window.
+//  2018-11-13: OpenGL: Support for GL 4.5's glClipControl(GL_UPPER_LEFT) / GL_CLIP_ORIGIN.
+//  2018-08-29: OpenGL: Added support for more OpenGL loaders: glew and glad, with comments indicative that any loader can be used.
+//  2018-08-09: OpenGL: Default to OpenGL ES 3 on iOS and Android. GLSL version default to "#version 300 ES".
+//  2018-07-30: OpenGL: Support for GLSL 300 ES and 410 core. Fixes for Emscripten compilation.
+//  2018-07-10: OpenGL: Support for more GLSL versions (based on the GLSL version string). Added error output when shaders fail to compile/link.
+//  2018-06-08: Misc: Extracted imgui_impl_opengl3.cpp/.h away from the old combined GLFW/SDL+OpenGL3 examples.
+//  2018-06-08: OpenGL: Use draw_data->DisplayPos and draw_data->DisplaySize to setup projection matrix and clipping rectangle.
+//  2018-05-25: OpenGL: Removed unnecessary backup/restore of GL_ELEMENT_ARRAY_BUFFER_BINDING since this is part of the VAO state.
+//  2018-05-14: OpenGL: Making the call to glBindSampler() optional so 3.2 context won't fail if the function is a NULL pointer.
+//  2018-03-06: OpenGL: Added const char* glsl_version parameter to ImGui_ImplOpenGL3_Init() so user can override the GLSL version e.g. "#version 150".
+//  2018-02-23: OpenGL: Create the VAO in the render function so the setup can more easily be used with multiple shared GL context.
+//  2018-02-16: Misc: Obsoleted the io.RenderDrawListsFn callback and exposed ImGui_ImplSdlGL3_RenderDrawData() in the .h file so you can call it yourself.
+//  2018-01-07: OpenGL: Changed GLSL shader version from 330 to 150.
+//  2017-09-01: OpenGL: Save and restore current bound sampler. Save and restore current polygon mode.
+//  2017-05-01: OpenGL: Fixed save and restore of current blend func state.
+//  2017-05-01: OpenGL: Fixed save and restore of current GL_ACTIVE_TEXTURE.
+//  2016-09-05: OpenGL: Fixed save and restore of current scissor rectangle.
+//  2016-07-29: OpenGL: Explicitly setting GL_UNPACK_ROW_LENGTH to reduce issues because SDL changes it. (#752)
+
+//----------------------------------------
+// OpenGL    GLSL      GLSL
+// version   version   string
+//----------------------------------------
+//  2.0       110       "#version 110"
+//  2.1       120       "#version 120"
+//  3.0       130       "#version 130"
+//  3.1       140       "#version 140"
+//  3.2       150       "#version 150"
+//  3.3       330       "#version 330 core"
+//  4.0       400       "#version 400 core"
+//  4.1       410       "#version 410 core"
+//  4.2       420       "#version 410 core"
+//  4.3       430       "#version 430 core"
+//  ES 2.0    100       "#version 100"      = WebGL 1.0
+//  ES 3.0    300       "#version 300 es"   = WebGL 2.0
+//----------------------------------------
+
+#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)
+#define _CRT_SECURE_NO_WARNINGS
+#endif
+
+#include "imgui.h"
+#include "imgui_impl_opengl3.h"
+#include <stdio.h>
+#if defined(_MSC_VER) && _MSC_VER <= 1500 // MSVC 2008 or earlier
+#include <stddef.h>     // intptr_t
+#else
+#include <stdint.h>     // intptr_t
+#endif
+
+// GL includes
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+#include <GLES2/gl2.h>
+#elif defined(IMGUI_IMPL_OPENGL_ES3)
+#if (defined(__APPLE__) && (TARGET_OS_IOS || TARGET_OS_TV))
+#include <OpenGLES/ES3/gl.h>    // Use GL ES 3
+#else
+#include <GLES3/gl3.h>          // Use GL ES 3
+#endif
+#else
+// About Desktop OpenGL function loaders:
+//  Modern desktop OpenGL doesn't have a standard portable header file to load OpenGL function pointers.
+//  Helper libraries are often used for this purpose! Here we are supporting a few common ones (gl3w, glew, glad).
+//  You may use another loader/header of your choice (glext, glLoadGen, etc.), or chose to manually implement your own.
+#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
+#include <GL/gl3w.h>            // Needs to be initialized with gl3wInit() in user's code
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
+#include <GL/glew.h>            // Needs to be initialized with glewInit() in user's code.
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
+#include <glad/glad.h>          // Needs to be initialized with gladLoadGL() in user's code.
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2)
+#include <glad/gl.h>            // Needs to be initialized with gladLoadGL(...) or gladLoaderLoadGL() in user's code.
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2)
+#ifndef GLFW_INCLUDE_NONE
+#define GLFW_INCLUDE_NONE       // GLFW including OpenGL headers causes ambiguity or multiple definition errors.
+#endif
+#include <glbinding/Binding.h>  // Needs to be initialized with glbinding::Binding::initialize() in user's code.
+#include <glbinding/gl/gl.h>
+using namespace gl;
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3)
+#ifndef GLFW_INCLUDE_NONE
+#define GLFW_INCLUDE_NONE       // GLFW including OpenGL headers causes ambiguity or multiple definition errors.
+#endif
+#include <glbinding/glbinding.h>// Needs to be initialized with glbinding::initialize() in user's code.
+#include <glbinding/gl/gl.h>
+using namespace gl;
+#else
+#include IMGUI_IMPL_OPENGL_LOADER_CUSTOM
+#endif
+#endif
+
+// Desktop GL 3.2+ has glDrawElementsBaseVertex() which GL ES and WebGL don't have.
+#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_2)
+#define IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
+#endif
+
+// Desktop GL 3.3+ has glBindSampler()
+#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_3)
+#define IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+#endif
+
+// Desktop GL 3.1+ has GL_PRIMITIVE_RESTART state
+#if !defined(IMGUI_IMPL_OPENGL_ES2) && !defined(IMGUI_IMPL_OPENGL_ES3) && defined(GL_VERSION_3_1)
+#define IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
+#endif
+
+// OpenGL Data
+static GLuint       g_GlVersion = 0;                // Extracted at runtime using GL_MAJOR_VERSION, GL_MINOR_VERSION queries (e.g. 320 for GL 3.2)
+static char         g_GlslVersionString[32] = "";   // Specified by user or detected based on compile time GL settings.
+static GLuint       g_FontTexture = 0;
+static GLuint       g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0;
+static GLint        g_AttribLocationTex = 0, g_AttribLocationProjMtx = 0;                                // Uniforms location
+static GLuint       g_AttribLocationVtxPos = 0, g_AttribLocationVtxUV = 0, g_AttribLocationVtxColor = 0; // Vertex attributes location
+static unsigned int g_VboHandle = 0, g_ElementsHandle = 0;
+
+// Forward Declarations
+static void ImGui_ImplOpenGL3_InitPlatformInterface();
+static void ImGui_ImplOpenGL3_ShutdownPlatformInterface();
+
+// Functions
+bool    ImGui_ImplOpenGL3_Init(const char* glsl_version)
+{
+    // Query for GL version (e.g. 320 for GL 3.2)
+#if !defined(IMGUI_IMPL_OPENGL_ES2)
+    GLint major = 0;
+    GLint minor = 0;
+    glGetIntegerv(GL_MAJOR_VERSION, &major);
+    glGetIntegerv(GL_MINOR_VERSION, &minor);
+    if (major == 0 && minor == 0)
+    {
+        // Query GL_VERSION in desktop GL 2.x, the string will start with "<major>.<minor>"
+        const char* gl_version = (const char*)glGetString(GL_VERSION);
+        sscanf(gl_version, "%d.%d", &major, &minor);
+    }
+    g_GlVersion = (GLuint)(major * 100 + minor * 10);
+#else
+    g_GlVersion = 200; // GLES 2
+#endif
+
+    // Setup backend capabilities flags
+    ImGuiIO& io = ImGui::GetIO();
+    io.BackendRendererName = "imgui_impl_opengl3";
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
+    if (g_GlVersion >= 320)
+        io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset;  // We can honor the ImDrawCmd::VtxOffset field, allowing for large meshes.
+#endif
+    io.BackendFlags |= ImGuiBackendFlags_RendererHasViewports;  // We can create multi-viewports on the Renderer side (optional)
+
+    // Store GLSL version string so we can refer to it later in case we recreate shaders.
+    // Note: GLSL version is NOT the same as GL version. Leave this to NULL if unsure.
+#if defined(IMGUI_IMPL_OPENGL_ES2)
+    if (glsl_version == NULL)
+        glsl_version = "#version 100";
+#elif defined(IMGUI_IMPL_OPENGL_ES3)
+    if (glsl_version == NULL)
+        glsl_version = "#version 300 es";
+#elif defined(__APPLE__)
+    if (glsl_version == NULL)
+        glsl_version = "#version 150";
+#else
+    if (glsl_version == NULL)
+        glsl_version = "#version 130";
+#endif
+    IM_ASSERT((int)strlen(glsl_version) + 2 < IM_ARRAYSIZE(g_GlslVersionString));
+    strcpy(g_GlslVersionString, glsl_version);
+    strcat(g_GlslVersionString, "\n");
+
+    // Debugging construct to make it easily visible in the IDE and debugger which GL loader has been selected.
+    // The code actually never uses the 'gl_loader' variable! It is only here so you can read it!
+    // If auto-detection fails or doesn't select the same GL loader file as used by your application,
+    // you are likely to get a crash below.
+    // You can explicitly select a loader by using '#define IMGUI_IMPL_OPENGL_LOADER_XXX' in imconfig.h or compiler command-line.
+    const char* gl_loader = "Unknown";
+    IM_UNUSED(gl_loader);
+#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
+    gl_loader = "GL3W";
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
+    gl_loader = "GLEW";
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
+    gl_loader = "GLAD";
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD2)
+    gl_loader = "GLAD2";
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2)
+    gl_loader = "glbinding2";
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING3)
+    gl_loader = "glbinding3";
+#elif defined(IMGUI_IMPL_OPENGL_LOADER_CUSTOM)
+    gl_loader = "custom";
+#else
+    gl_loader = "none";
+#endif
+
+    // Make an arbitrary GL call (we don't actually need the result)
+    // IF YOU GET A CRASH HERE: it probably means that you haven't initialized the OpenGL function loader used by this code.
+    // Desktop OpenGL 3/4 need a function loader. See the IMGUI_IMPL_OPENGL_LOADER_xxx explanation above.
+    GLint current_texture;
+    glGetIntegerv(GL_TEXTURE_BINDING_2D, &current_texture);
+
+    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        ImGui_ImplOpenGL3_InitPlatformInterface();
+
+    return true;
+}
+
+void    ImGui_ImplOpenGL3_Shutdown()
+{
+    ImGui_ImplOpenGL3_ShutdownPlatformInterface();
+    ImGui_ImplOpenGL3_DestroyDeviceObjects();
+}
+
+void    ImGui_ImplOpenGL3_NewFrame()
+{
+    if (!g_ShaderHandle)
+        ImGui_ImplOpenGL3_CreateDeviceObjects();
+}
+
+static void ImGui_ImplOpenGL3_SetupRenderState(ImDrawData* draw_data, int fb_width, int fb_height, GLuint vertex_array_object)
+{
+    // Setup render state: alpha-blending enabled, no face culling, no depth testing, scissor enabled, polygon fill
+    glEnable(GL_BLEND);
+    glBlendEquation(GL_FUNC_ADD);
+    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    glDisable(GL_CULL_FACE);
+    glDisable(GL_DEPTH_TEST);
+    glEnable(GL_SCISSOR_TEST);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
+    if (g_GlVersion >= 310)
+        glDisable(GL_PRIMITIVE_RESTART);
+#endif
+#ifdef GL_POLYGON_MODE
+    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+#endif
+
+    // Support for GL 4.5 rarely used glClipControl(GL_UPPER_LEFT)
+    bool clip_origin_lower_left = true;
+#if defined(GL_CLIP_ORIGIN) && !defined(__APPLE__)
+    GLenum current_clip_origin = 0; glGetIntegerv(GL_CLIP_ORIGIN, (GLint*)&current_clip_origin);
+    if (current_clip_origin == GL_UPPER_LEFT)
+        clip_origin_lower_left = false;
+#endif
+
+    // Setup viewport, orthographic projection matrix
+    // Our visible imgui space lies from draw_data->DisplayPos (top left) to draw_data->DisplayPos+data_data->DisplaySize (bottom right). DisplayPos is (0,0) for single viewport apps.
+    glViewport(0, 0, (GLsizei)fb_width, (GLsizei)fb_height);
+    float L = draw_data->DisplayPos.x;
+    float R = draw_data->DisplayPos.x + draw_data->DisplaySize.x;
+    float T = draw_data->DisplayPos.y;
+    float B = draw_data->DisplayPos.y + draw_data->DisplaySize.y;
+    if (!clip_origin_lower_left) { float tmp = T; T = B; B = tmp; } // Swap top and bottom if origin is upper left
+    const float ortho_projection[4][4] =
+    {
+        { 2.0f/(R-L),   0.0f,         0.0f,   0.0f },
+        { 0.0f,         2.0f/(T-B),   0.0f,   0.0f },
+        { 0.0f,         0.0f,        -1.0f,   0.0f },
+        { (R+L)/(L-R),  (T+B)/(B-T),  0.0f,   1.0f },
+    };
+    glUseProgram(g_ShaderHandle);
+    glUniform1i(g_AttribLocationTex, 0);
+    glUniformMatrix4fv(g_AttribLocationProjMtx, 1, GL_FALSE, &ortho_projection[0][0]);
+    
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+    if (g_GlVersion >= 330)
+        glBindSampler(0, 0); // We use combined texture/sampler state. Applications using GL 3.3 may set that otherwise.
+#endif
+    
+    (void)vertex_array_object;
+#ifndef IMGUI_IMPL_OPENGL_ES2
+    glBindVertexArray(vertex_array_object);
+#endif
+
+    // Bind vertex/index buffers and setup attributes for ImDrawVert
+    glBindBuffer(GL_ARRAY_BUFFER, g_VboHandle);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_ElementsHandle);
+    glEnableVertexAttribArray(g_AttribLocationVtxPos);
+    glEnableVertexAttribArray(g_AttribLocationVtxUV);
+    glEnableVertexAttribArray(g_AttribLocationVtxColor);
+    glVertexAttribPointer(g_AttribLocationVtxPos,   2, GL_FLOAT,         GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, pos));
+    glVertexAttribPointer(g_AttribLocationVtxUV,    2, GL_FLOAT,         GL_FALSE, sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, uv));
+    glVertexAttribPointer(g_AttribLocationVtxColor, 4, GL_UNSIGNED_BYTE, GL_TRUE,  sizeof(ImDrawVert), (GLvoid*)IM_OFFSETOF(ImDrawVert, col));
+}
+
+// OpenGL3 Render function.
+// Note that this implementation is little overcomplicated because we are saving/setting up/restoring every OpenGL state explicitly.
+// This is in order to be able to run within an OpenGL engine that doesn't do so.
+void    ImGui_ImplOpenGL3_RenderDrawData(ImDrawData* draw_data)
+{
+    // Avoid rendering when minimized, scale coordinates for retina displays (screen coordinates != framebuffer coordinates)
+    int fb_width = (int)(draw_data->DisplaySize.x * draw_data->FramebufferScale.x);
+    int fb_height = (int)(draw_data->DisplaySize.y * draw_data->FramebufferScale.y);
+    if (fb_width <= 0 || fb_height <= 0)
+        return;
+
+    // Backup GL state
+    GLenum last_active_texture; glGetIntegerv(GL_ACTIVE_TEXTURE, (GLint*)&last_active_texture);
+    glActiveTexture(GL_TEXTURE0);
+    GLuint last_program; glGetIntegerv(GL_CURRENT_PROGRAM, (GLint*)&last_program);
+    GLuint last_texture; glGetIntegerv(GL_TEXTURE_BINDING_2D, (GLint*)&last_texture);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+    GLuint last_sampler; if (g_GlVersion >= 330) { glGetIntegerv(GL_SAMPLER_BINDING, (GLint*)&last_sampler); } else { last_sampler = 0; }
+#endif
+    GLuint last_array_buffer; glGetIntegerv(GL_ARRAY_BUFFER_BINDING, (GLint*)&last_array_buffer);
+#ifndef IMGUI_IMPL_OPENGL_ES2
+    GLuint last_vertex_array_object; glGetIntegerv(GL_VERTEX_ARRAY_BINDING, (GLint*)&last_vertex_array_object);
+#endif
+#ifdef GL_POLYGON_MODE
+    GLint last_polygon_mode[2]; glGetIntegerv(GL_POLYGON_MODE, last_polygon_mode);
+#endif
+    GLint last_viewport[4]; glGetIntegerv(GL_VIEWPORT, last_viewport);
+    GLint last_scissor_box[4]; glGetIntegerv(GL_SCISSOR_BOX, last_scissor_box);
+    GLenum last_blend_src_rgb; glGetIntegerv(GL_BLEND_SRC_RGB, (GLint*)&last_blend_src_rgb);
+    GLenum last_blend_dst_rgb; glGetIntegerv(GL_BLEND_DST_RGB, (GLint*)&last_blend_dst_rgb);
+    GLenum last_blend_src_alpha; glGetIntegerv(GL_BLEND_SRC_ALPHA, (GLint*)&last_blend_src_alpha);
+    GLenum last_blend_dst_alpha; glGetIntegerv(GL_BLEND_DST_ALPHA, (GLint*)&last_blend_dst_alpha);
+    GLenum last_blend_equation_rgb; glGetIntegerv(GL_BLEND_EQUATION_RGB, (GLint*)&last_blend_equation_rgb);
+    GLenum last_blend_equation_alpha; glGetIntegerv(GL_BLEND_EQUATION_ALPHA, (GLint*)&last_blend_equation_alpha);
+    GLboolean last_enable_blend = glIsEnabled(GL_BLEND);
+    GLboolean last_enable_cull_face = glIsEnabled(GL_CULL_FACE);
+    GLboolean last_enable_depth_test = glIsEnabled(GL_DEPTH_TEST);
+    GLboolean last_enable_scissor_test = glIsEnabled(GL_SCISSOR_TEST);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
+    GLboolean last_enable_primitive_restart = (g_GlVersion >= 310) ? glIsEnabled(GL_PRIMITIVE_RESTART) : GL_FALSE;
+#endif
+
+    // Setup desired GL state
+    // Recreate the VAO every time (this is to easily allow multiple GL contexts to be rendered to. VAO are not shared among GL contexts)
+    // The renderer would actually work without any VAO bound, but then our VertexAttrib calls would overwrite the default one currently bound.
+    GLuint vertex_array_object = 0;
+#ifndef IMGUI_IMPL_OPENGL_ES2
+    glGenVertexArrays(1, &vertex_array_object);
+#endif
+    ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object);
+
+    // Will project scissor/clipping rectangles into framebuffer space
+    ImVec2 clip_off = draw_data->DisplayPos;         // (0,0) unless using multi-viewports
+    ImVec2 clip_scale = draw_data->FramebufferScale; // (1,1) unless using retina display which are often (2,2)
+
+    // Render command lists
+    for (int n = 0; n < draw_data->CmdListsCount; n++)
+    {
+        const ImDrawList* cmd_list = draw_data->CmdLists[n];
+
+        // Upload vertex/index buffers
+        glBufferData(GL_ARRAY_BUFFER, (GLsizeiptr)cmd_list->VtxBuffer.Size * (int)sizeof(ImDrawVert), (const GLvoid*)cmd_list->VtxBuffer.Data, GL_STREAM_DRAW);
+        glBufferData(GL_ELEMENT_ARRAY_BUFFER, (GLsizeiptr)cmd_list->IdxBuffer.Size * (int)sizeof(ImDrawIdx), (const GLvoid*)cmd_list->IdxBuffer.Data, GL_STREAM_DRAW);
+
+        for (int cmd_i = 0; cmd_i < cmd_list->CmdBuffer.Size; cmd_i++)
+        {
+            const ImDrawCmd* pcmd = &cmd_list->CmdBuffer[cmd_i];
+            if (pcmd->UserCallback != NULL)
+            {
+                // User callback, registered via ImDrawList::AddCallback()
+                // (ImDrawCallback_ResetRenderState is a special callback value used by the user to request the renderer to reset render state.)
+                if (pcmd->UserCallback == ImDrawCallback_ResetRenderState)
+                    ImGui_ImplOpenGL3_SetupRenderState(draw_data, fb_width, fb_height, vertex_array_object);
+                else
+                    pcmd->UserCallback(cmd_list, pcmd);
+            }
+            else
+            {
+                // Project scissor/clipping rectangles into framebuffer space
+                ImVec4 clip_rect;
+                clip_rect.x = (pcmd->ClipRect.x - clip_off.x) * clip_scale.x;
+                clip_rect.y = (pcmd->ClipRect.y - clip_off.y) * clip_scale.y;
+                clip_rect.z = (pcmd->ClipRect.z - clip_off.x) * clip_scale.x;
+                clip_rect.w = (pcmd->ClipRect.w - clip_off.y) * clip_scale.y;
+
+                if (clip_rect.x < fb_width && clip_rect.y < fb_height && clip_rect.z >= 0.0f && clip_rect.w >= 0.0f)
+                {
+                    // Apply scissor/clipping rectangle
+                    glScissor((int)clip_rect.x, (int)(fb_height - clip_rect.w), (int)(clip_rect.z - clip_rect.x), (int)(clip_rect.w - clip_rect.y));
+
+                    // Bind texture, Draw
+                    glBindTexture(GL_TEXTURE_2D, (GLuint)(intptr_t)pcmd->TextureId);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_VTX_OFFSET
+                    if (g_GlVersion >= 320)
+                        glDrawElementsBaseVertex(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx)), (GLint)pcmd->VtxOffset);
+                    else
+#endif
+                    glDrawElements(GL_TRIANGLES, (GLsizei)pcmd->ElemCount, sizeof(ImDrawIdx) == 2 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT, (void*)(intptr_t)(pcmd->IdxOffset * sizeof(ImDrawIdx)));
+                }
+            }
+        }
+    }
+
+    // Destroy the temporary VAO
+#ifndef IMGUI_IMPL_OPENGL_ES2
+    glDeleteVertexArrays(1, &vertex_array_object);
+#endif
+
+    // Restore modified GL state
+    glUseProgram(last_program);
+    glBindTexture(GL_TEXTURE_2D, last_texture);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_BIND_SAMPLER
+    if (g_GlVersion >= 330)
+        glBindSampler(0, last_sampler);
+#endif
+    glActiveTexture(last_active_texture);
+#ifndef IMGUI_IMPL_OPENGL_ES2
+    glBindVertexArray(last_vertex_array_object);
+#endif
+    glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
+    glBlendEquationSeparate(last_blend_equation_rgb, last_blend_equation_alpha);
+    glBlendFuncSeparate(last_blend_src_rgb, last_blend_dst_rgb, last_blend_src_alpha, last_blend_dst_alpha);
+    if (last_enable_blend) glEnable(GL_BLEND); else glDisable(GL_BLEND);
+    if (last_enable_cull_face) glEnable(GL_CULL_FACE); else glDisable(GL_CULL_FACE);
+    if (last_enable_depth_test) glEnable(GL_DEPTH_TEST); else glDisable(GL_DEPTH_TEST);
+    if (last_enable_scissor_test) glEnable(GL_SCISSOR_TEST); else glDisable(GL_SCISSOR_TEST);
+#ifdef IMGUI_IMPL_OPENGL_MAY_HAVE_PRIMITIVE_RESTART
+    if (g_GlVersion >= 310) { if (last_enable_primitive_restart) glEnable(GL_PRIMITIVE_RESTART); else glDisable(GL_PRIMITIVE_RESTART); }
+#endif
+
+#ifdef GL_POLYGON_MODE
+    glPolygonMode(GL_FRONT_AND_BACK, (GLenum)last_polygon_mode[0]);
+#endif
+    glViewport(last_viewport[0], last_viewport[1], (GLsizei)last_viewport[2], (GLsizei)last_viewport[3]);
+    glScissor(last_scissor_box[0], last_scissor_box[1], (GLsizei)last_scissor_box[2], (GLsizei)last_scissor_box[3]);
+}
+
+bool ImGui_ImplOpenGL3_CreateFontsTexture()
+{
+    // Build texture atlas
+    ImGuiIO& io = ImGui::GetIO();
+    unsigned char* pixels;
+    int width, height;
+    io.Fonts->GetTexDataAsRGBA32(&pixels, &width, &height);   // Load as RGBA 32-bit (75% of the memory is wasted, but default font is so small) because it is more likely to be compatible with user's existing shaders. If your ImTextureId represent a higher-level concept than just a GL texture id, consider calling GetTexDataAsAlpha8() instead to save on GPU memory.
+
+    // Upload texture to graphics system
+    GLint last_texture;
+    glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
+    glGenTextures(1, &g_FontTexture);
+    glBindTexture(GL_TEXTURE_2D, g_FontTexture);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+#ifdef GL_UNPACK_ROW_LENGTH
+    glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+#endif
+    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+
+    // Store our identifier
+    io.Fonts->TexID = (ImTextureID)(intptr_t)g_FontTexture;
+
+    // Restore state
+    glBindTexture(GL_TEXTURE_2D, last_texture);
+
+    return true;
+}
+
+void ImGui_ImplOpenGL3_DestroyFontsTexture()
+{
+    if (g_FontTexture)
+    {
+        ImGuiIO& io = ImGui::GetIO();
+        glDeleteTextures(1, &g_FontTexture);
+        io.Fonts->TexID = 0;
+        g_FontTexture = 0;
+    }
+}
+
+// If you get an error please report on github. You may try different GL context version or GLSL version. See GL<>GLSL version table at the top of this file.
+static bool CheckShader(GLuint handle, const char* desc)
+{
+    GLint status = 0, log_length = 0;
+    glGetShaderiv(handle, GL_COMPILE_STATUS, &status);
+    glGetShaderiv(handle, GL_INFO_LOG_LENGTH, &log_length);
+    if ((GLboolean)status == GL_FALSE)
+        fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to compile %s!\n", desc);
+    if (log_length > 1)
+    {
+        ImVector<char> buf;
+        buf.resize((int)(log_length + 1));
+        glGetShaderInfoLog(handle, log_length, NULL, (GLchar*)buf.begin());
+        fprintf(stderr, "%s\n", buf.begin());
+    }
+    return (GLboolean)status == GL_TRUE;
+}
+
+// If you get an error please report on GitHub. You may try different GL context version or GLSL version.
+static bool CheckProgram(GLuint handle, const char* desc)
+{
+    GLint status = 0, log_length = 0;
+    glGetProgramiv(handle, GL_LINK_STATUS, &status);
+    glGetProgramiv(handle, GL_INFO_LOG_LENGTH, &log_length);
+    if ((GLboolean)status == GL_FALSE)
+        fprintf(stderr, "ERROR: ImGui_ImplOpenGL3_CreateDeviceObjects: failed to link %s! (with GLSL '%s')\n", desc, g_GlslVersionString);
+    if (log_length > 1)
+    {
+        ImVector<char> buf;
+        buf.resize((int)(log_length + 1));
+        glGetProgramInfoLog(handle, log_length, NULL, (GLchar*)buf.begin());
+        fprintf(stderr, "%s\n", buf.begin());
+    }
+    return (GLboolean)status == GL_TRUE;
+}
+
+bool    ImGui_ImplOpenGL3_CreateDeviceObjects()
+{
+    // Backup GL state
+    GLint last_texture, last_array_buffer;
+    glGetIntegerv(GL_TEXTURE_BINDING_2D, &last_texture);
+    glGetIntegerv(GL_ARRAY_BUFFER_BINDING, &last_array_buffer);
+#ifndef IMGUI_IMPL_OPENGL_ES2
+    GLint last_vertex_array;
+    glGetIntegerv(GL_VERTEX_ARRAY_BINDING, &last_vertex_array);
+#endif
+
+    // Parse GLSL version string
+    int glsl_version = 130;
+    sscanf(g_GlslVersionString, "#version %d", &glsl_version);
+
+    const GLchar* vertex_shader_glsl_120 =
+        "uniform mat4 ProjMtx;\n"
+        "attribute vec2 Position;\n"
+        "attribute vec2 UV;\n"
+        "attribute vec4 Color;\n"
+        "varying vec2 Frag_UV;\n"
+        "varying vec4 Frag_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Frag_UV = UV;\n"
+        "    Frag_Color = Color;\n"
+        "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+        "}\n";
+
+    const GLchar* vertex_shader_glsl_130 =
+        "uniform mat4 ProjMtx;\n"
+        "in vec2 Position;\n"
+        "in vec2 UV;\n"
+        "in vec4 Color;\n"
+        "out vec2 Frag_UV;\n"
+        "out vec4 Frag_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Frag_UV = UV;\n"
+        "    Frag_Color = Color;\n"
+        "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+        "}\n";
+
+    const GLchar* vertex_shader_glsl_300_es =
+        "precision mediump float;\n"
+        "layout (location = 0) in vec2 Position;\n"
+        "layout (location = 1) in vec2 UV;\n"
+        "layout (location = 2) in vec4 Color;\n"
+        "uniform mat4 ProjMtx;\n"
+        "out vec2 Frag_UV;\n"
+        "out vec4 Frag_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Frag_UV = UV;\n"
+        "    Frag_Color = Color;\n"
+        "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+        "}\n";
+
+    const GLchar* vertex_shader_glsl_410_core =
+        "layout (location = 0) in vec2 Position;\n"
+        "layout (location = 1) in vec2 UV;\n"
+        "layout (location = 2) in vec4 Color;\n"
+        "uniform mat4 ProjMtx;\n"
+        "out vec2 Frag_UV;\n"
+        "out vec4 Frag_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Frag_UV = UV;\n"
+        "    Frag_Color = Color;\n"
+        "    gl_Position = ProjMtx * vec4(Position.xy,0,1);\n"
+        "}\n";
+
+    const GLchar* fragment_shader_glsl_120 =
+        "#ifdef GL_ES\n"
+        "    precision mediump float;\n"
+        "#endif\n"
+        "uniform sampler2D Texture;\n"
+        "varying vec2 Frag_UV;\n"
+        "varying vec4 Frag_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    gl_FragColor = Frag_Color * texture2D(Texture, Frag_UV.st);\n"
+        "}\n";
+
+    const GLchar* fragment_shader_glsl_130 =
+        "uniform sampler2D Texture;\n"
+        "in vec2 Frag_UV;\n"
+        "in vec4 Frag_Color;\n"
+        "out vec4 Out_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+        "}\n";
+
+    const GLchar* fragment_shader_glsl_300_es =
+        "precision mediump float;\n"
+        "uniform sampler2D Texture;\n"
+        "in vec2 Frag_UV;\n"
+        "in vec4 Frag_Color;\n"
+        "layout (location = 0) out vec4 Out_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+        "}\n";
+
+    const GLchar* fragment_shader_glsl_410_core =
+        "in vec2 Frag_UV;\n"
+        "in vec4 Frag_Color;\n"
+        "uniform sampler2D Texture;\n"
+        "layout (location = 0) out vec4 Out_Color;\n"
+        "void main()\n"
+        "{\n"
+        "    Out_Color = Frag_Color * texture(Texture, Frag_UV.st);\n"
+        "}\n";
+
+    // Select shaders matching our GLSL versions
+    const GLchar* vertex_shader = NULL;
+    const GLchar* fragment_shader = NULL;
+    if (glsl_version < 130)
+    {
+        vertex_shader = vertex_shader_glsl_120;
+        fragment_shader = fragment_shader_glsl_120;
+    }
+    else if (glsl_version >= 410)
+    {
+        vertex_shader = vertex_shader_glsl_410_core;
+        fragment_shader = fragment_shader_glsl_410_core;
+    }
+    else if (glsl_version == 300)
+    {
+        vertex_shader = vertex_shader_glsl_300_es;
+        fragment_shader = fragment_shader_glsl_300_es;
+    }
+    else
+    {
+        vertex_shader = vertex_shader_glsl_130;
+        fragment_shader = fragment_shader_glsl_130;
+    }
+
+    // Create shaders
+    const GLchar* vertex_shader_with_version[2] = { g_GlslVersionString, vertex_shader };
+    g_VertHandle = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(g_VertHandle, 2, vertex_shader_with_version, NULL);
+    glCompileShader(g_VertHandle);
+    CheckShader(g_VertHandle, "vertex shader");
+
+    const GLchar* fragment_shader_with_version[2] = { g_GlslVersionString, fragment_shader };
+    g_FragHandle = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(g_FragHandle, 2, fragment_shader_with_version, NULL);
+    glCompileShader(g_FragHandle);
+    CheckShader(g_FragHandle, "fragment shader");
+
+    g_ShaderHandle = glCreateProgram();
+    glAttachShader(g_ShaderHandle, g_VertHandle);
+    glAttachShader(g_ShaderHandle, g_FragHandle);
+    glLinkProgram(g_ShaderHandle);
+    CheckProgram(g_ShaderHandle, "shader program");
+
+    g_AttribLocationTex = glGetUniformLocation(g_ShaderHandle, "Texture");
+    g_AttribLocationProjMtx = glGetUniformLocation(g_ShaderHandle, "ProjMtx");
+    g_AttribLocationVtxPos = (GLuint)glGetAttribLocation(g_ShaderHandle, "Position");
+    g_AttribLocationVtxUV = (GLuint)glGetAttribLocation(g_ShaderHandle, "UV");
+    g_AttribLocationVtxColor = (GLuint)glGetAttribLocation(g_ShaderHandle, "Color");
+
+    // Create buffers
+    glGenBuffers(1, &g_VboHandle);
+    glGenBuffers(1, &g_ElementsHandle);
+
+    ImGui_ImplOpenGL3_CreateFontsTexture();
+
+    // Restore modified GL state
+    glBindTexture(GL_TEXTURE_2D, last_texture);
+    glBindBuffer(GL_ARRAY_BUFFER, last_array_buffer);
+#ifndef IMGUI_IMPL_OPENGL_ES2
+    glBindVertexArray(last_vertex_array);
+#endif
+
+    return true;
+}
+
+void    ImGui_ImplOpenGL3_DestroyDeviceObjects()
+{
+    if (g_VboHandle)        { glDeleteBuffers(1, &g_VboHandle); g_VboHandle = 0; }
+    if (g_ElementsHandle)   { glDeleteBuffers(1, &g_ElementsHandle); g_ElementsHandle = 0; }
+    if (g_ShaderHandle && g_VertHandle) { glDetachShader(g_ShaderHandle, g_VertHandle); }
+    if (g_ShaderHandle && g_FragHandle) { glDetachShader(g_ShaderHandle, g_FragHandle); }
+    if (g_VertHandle)       { glDeleteShader(g_VertHandle); g_VertHandle = 0; }
+    if (g_FragHandle)       { glDeleteShader(g_FragHandle); g_FragHandle = 0; }
+    if (g_ShaderHandle)     { glDeleteProgram(g_ShaderHandle); g_ShaderHandle = 0; }
+
+    ImGui_ImplOpenGL3_DestroyFontsTexture();
+}
+
+//--------------------------------------------------------------------------------------------------------
+// MULTI-VIEWPORT / PLATFORM INTERFACE SUPPORT
+// This is an _advanced_ and _optional_ feature, allowing the backend to create and handle multiple viewports simultaneously.
+// If you are new to dear imgui or creating a new binding for dear imgui, it is recommended that you completely ignore this section first..
+//--------------------------------------------------------------------------------------------------------
+
+static void ImGui_ImplOpenGL3_RenderWindow(ImGuiViewport* viewport, void*)
+{
+    if (!(viewport->Flags & ImGuiViewportFlags_NoRendererClear))
+    {
+        ImVec4 clear_color = ImVec4(0.0f, 0.0f, 0.0f, 1.0f);
+        glClearColor(clear_color.x, clear_color.y, clear_color.z, clear_color.w);
+        glClear(GL_COLOR_BUFFER_BIT);
+    }
+    ImGui_ImplOpenGL3_RenderDrawData(viewport->DrawData);
+}
+
+static void ImGui_ImplOpenGL3_InitPlatformInterface()
+{
+    ImGuiPlatformIO& platform_io = ImGui::GetPlatformIO();
+    platform_io.Renderer_RenderWindow = ImGui_ImplOpenGL3_RenderWindow;
+}
+
+static void ImGui_ImplOpenGL3_ShutdownPlatformInterface()
+{
+    ImGui::DestroyPlatformWindows();
+}

libs/glad/include/KHR/khrplatform.h

@@ -0,0 +1,290 @@
+#ifndef __khrplatform_h_
+#define __khrplatform_h_
+
+/*
+** Copyright (c) 2008-2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+/* Khronos platform-specific types and definitions.
+ *
+ * The master copy of khrplatform.h is maintained in the Khronos EGL
+ * Registry repository at https://github.com/KhronosGroup/EGL-Registry
+ * The last semantic modification to khrplatform.h was at commit ID:
+ *      67a3e0864c2d75ea5287b9f3d2eb74a745936692
+ *
+ * Adopters may modify this file to suit their platform. Adopters are
+ * encouraged to submit platform specific modifications to the Khronos
+ * group so that they can be included in future versions of this file.
+ * Please submit changes by filing pull requests or issues on
+ * the EGL Registry repository linked above.
+ *
+ *
+ * See the Implementer's Guidelines for information about where this file
+ * should be located on your system and for more details of its use:
+ *    http://www.khronos.org/registry/implementers_guide.pdf
+ *
+ * This file should be included as
+ *        #include <KHR/khrplatform.h>
+ * by Khronos client API header files that use its types and defines.
+ *
+ * The types in khrplatform.h should only be used to define API-specific types.
+ *
+ * Types defined in khrplatform.h:
+ *    khronos_int8_t              signed   8  bit
+ *    khronos_uint8_t             unsigned 8  bit
+ *    khronos_int16_t             signed   16 bit
+ *    khronos_uint16_t            unsigned 16 bit
+ *    khronos_int32_t             signed   32 bit
+ *    khronos_uint32_t            unsigned 32 bit
+ *    khronos_int64_t             signed   64 bit
+ *    khronos_uint64_t            unsigned 64 bit
+ *    khronos_intptr_t            signed   same number of bits as a pointer
+ *    khronos_uintptr_t           unsigned same number of bits as a pointer
+ *    khronos_ssize_t             signed   size
+ *    khronos_usize_t             unsigned size
+ *    khronos_float_t             signed   32 bit floating point
+ *    khronos_time_ns_t           unsigned 64 bit time in nanoseconds
+ *    khronos_utime_nanoseconds_t unsigned time interval or absolute time in
+ *                                         nanoseconds
+ *    khronos_stime_nanoseconds_t signed time interval in nanoseconds
+ *    khronos_boolean_enum_t      enumerated boolean type. This should
+ *      only be used as a base type when a client API's boolean type is
+ *      an enum. Client APIs which use an integer or other type for
+ *      booleans cannot use this as the base type for their boolean.
+ *
+ * Tokens defined in khrplatform.h:
+ *
+ *    KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
+ *
+ *    KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
+ *    KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
+ *
+ * Calling convention macros defined in this file:
+ *    KHRONOS_APICALL
+ *    KHRONOS_APIENTRY
+ *    KHRONOS_APIATTRIBUTES
+ *
+ * These may be used in function prototypes as:
+ *
+ *      KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
+ *                                  int arg1,
+ *                                  int arg2) KHRONOS_APIATTRIBUTES;
+ */
+
+#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
+#   define KHRONOS_STATIC 1
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(KHRONOS_STATIC)
+    /* If the preprocessor constant KHRONOS_STATIC is defined, make the
+     * header compatible with static linking. */
+#   define KHRONOS_APICALL
+#elif defined(_WIN32)
+#   define KHRONOS_APICALL __declspec(dllimport)
+#elif defined (__SYMBIAN32__)
+#   define KHRONOS_APICALL IMPORT_C
+#elif defined(__ANDROID__)
+#   define KHRONOS_APICALL __attribute__((visibility("default")))
+#else
+#   define KHRONOS_APICALL
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIENTRY
+ *-------------------------------------------------------------------------
+ * This follows the return type of the function  and precedes the function
+ * name in the function prototype.
+ */
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
+    /* Win32 but not WinCE */
+#   define KHRONOS_APIENTRY __stdcall
+#else
+#   define KHRONOS_APIENTRY
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIATTRIBUTES
+ *-------------------------------------------------------------------------
+ * This follows the closing parenthesis of the function prototype arguments.
+ */
+#if defined (__ARMCC_2__)
+#define KHRONOS_APIATTRIBUTES __softfp
+#else
+#define KHRONOS_APIATTRIBUTES
+#endif
+
+/*-------------------------------------------------------------------------
+ * basic type definitions
+ *-----------------------------------------------------------------------*/
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
+
+
+/*
+ * Using <stdint.h>
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__VMS ) || defined(__sgi)
+
+/*
+ * Using <inttypes.h>
+ */
+#include <inttypes.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
+
+/*
+ * Win32
+ */
+typedef __int32                 khronos_int32_t;
+typedef unsigned __int32        khronos_uint32_t;
+typedef __int64                 khronos_int64_t;
+typedef unsigned __int64        khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__sun__) || defined(__digital__)
+
+/*
+ * Sun or Digital
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#if defined(__arch64__) || defined(_LP64)
+typedef long int                khronos_int64_t;
+typedef unsigned long int       khronos_uint64_t;
+#else
+typedef long long int           khronos_int64_t;
+typedef unsigned long long int  khronos_uint64_t;
+#endif /* __arch64__ */
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif 0
+
+/*
+ * Hypothetical platform with no float or int64 support
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#define KHRONOS_SUPPORT_INT64   0
+#define KHRONOS_SUPPORT_FLOAT   0
+
+#else
+
+/*
+ * Generic fallback
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#endif
+
+
+/*
+ * Types that are (so far) the same on all platforms
+ */
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+
+/*
+ * Types that differ between LLP64 and LP64 architectures - in LLP64,
+ * pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
+ * to be the only LLP64 architecture in current use.
+ */
+#ifdef _WIN64
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+typedef signed   long  int     khronos_ssize_t;
+typedef unsigned long  int     khronos_usize_t;
+#endif
+
+#if KHRONOS_SUPPORT_FLOAT
+/*
+ * Float type
+ */
+typedef          float         khronos_float_t;
+#endif
+
+#if KHRONOS_SUPPORT_INT64
+/* Time types
+ *
+ * These types can be used to represent a time interval in nanoseconds or
+ * an absolute Unadjusted System Time.  Unadjusted System Time is the number
+ * of nanoseconds since some arbitrary system event (e.g. since the last
+ * time the system booted).  The Unadjusted System Time is an unsigned
+ * 64 bit value that wraps back to 0 every 584 years.  Time intervals
+ * may be either signed or unsigned.
+ */
+typedef khronos_uint64_t       khronos_utime_nanoseconds_t;
+typedef khronos_int64_t        khronos_stime_nanoseconds_t;
+#endif
+
+/*
+ * Dummy value used to pad enum types to 32 bits.
+ */
+#ifndef KHRONOS_MAX_ENUM
+#define KHRONOS_MAX_ENUM 0x7FFFFFFF
+#endif
+
+/*
+ * Enumerated boolean type
+ *
+ * Values other than zero should be considered to be true.  Therefore
+ * comparisons should not be made against KHRONOS_TRUE.
+ */
+typedef enum {
+    KHRONOS_FALSE = 0,
+    KHRONOS_TRUE  = 1,
+    KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
+} khronos_boolean_enum_t;
+
+#endif /* __khrplatform_h_ */

source/main.cpp

@@ -0,0 +1,15 @@
+#include "window.hpp"
+
+#include "views/view_hexeditor.hpp"
+#include "views/view_pattern.hpp"
+
+int main() {
+    hex::Window window;
+
+    auto* hexEditor = window.addView<hex::ViewHexEditor>();
+    window.addView<hex::ViewPattern>(hexEditor);
+
+    window.loop();
+
+    return 0;
+}

source/parser/lexer.cpp

@@ -0,0 +1,155 @@
+#include "parser/lexer.hpp"
+
+#include <vector>
+#include <functional>
+
+namespace hex::lang {
+
+    Lexer::Lexer() { }
+
+    std::string matchTillInvalid(const char* characters, std::function<bool(char)> predicate) {
+        std::string ret;
+
+        while (*characters != 0x00) {
+            ret += *characters;
+            characters++;
+
+            if (!predicate(*characters))
+                break;
+        }
+
+        return ret;
+    }
+
+    std::optional<u64> parseInt(std::string_view string) {
+        u64 integer = 0;
+        u8 base = 10;
+
+        std::string_view numberData;
+
+        if (string.starts_with("0x")) {
+            numberData = string.substr(2);
+            base = 16;
+
+            if (numberData.find_first_not_of("0123456789ABCDEFabcdef") != std::string_view::npos)
+                return { };
+        } else if (string.starts_with("0b")) {
+            numberData = string.substr(2);
+            base = 2;
+
+            if (numberData.find_first_not_of("01") != std::string_view::npos)
+                return { };
+        } else if (isdigit(string[0])) {
+            numberData = string;
+            base = 10;
+
+            if (numberData.find_first_not_of("0123456789") != std::string_view::npos)
+                return { };
+        } else return { };
+
+        if (numberData.length() == 0)
+            return { };
+
+        for (const char& c : numberData) {
+                integer *= base;
+
+            if (isdigit(c))
+                integer += (c - '0');
+            else if (c >= 'A' && c <= 'F')
+                integer += (c - 'A');
+            else if (c >= 'a' && c <= 'f')
+                integer += (c - 'a');
+            else return { };
+        }
+
+        return integer;
+    }
+
+    std::pair<Result, std::vector<Token>> Lexer::lex(const std::string& code) {
+        std::vector<Token> tokens;
+        u32 offset = 0;
+
+        while (offset < code.length()) {
+            const char& c = code[offset];
+
+            if (std::isblank(c) || std::isspace(c)) {
+                offset += 1;
+            } else if (c == ';') {
+                tokens.push_back({.type = Token::Type::EndOfExpression});
+                offset += 1;
+            } else if (c == '{') {
+                tokens.push_back({.type = Token::Type::ScopeOpen});
+                offset += 1;
+            } else if (c == '}') {
+                tokens.push_back({.type = Token::Type::ScopeClose});
+                offset += 1;
+            } else if (c == ',') {
+                tokens.push_back({.type = Token::Type::Separator});
+                offset += 1;
+            } else if (c == '@') {
+              tokens.push_back({.type = Token::Type::Operator, .operatorToken = { .op = Token::OperatorToken::Operator::AtDeclaration}});
+              offset += 1;
+            } else if (c == '=') {
+                tokens.push_back({.type = Token::Type::Operator, .operatorToken = { .op = Token::OperatorToken::Operator::Assignment}});
+                offset += 1;
+            } else if (std::isalpha(c)) {
+                std::string identifier = matchTillInvalid(&code[offset], [](char c) -> bool { return std::isalnum(c) || c == '_'; });
+
+                // Check for reserved keywords
+
+                if (identifier == "struct")
+                    tokens.push_back({.type = Token::Type::Keyword, .keywordToken = { .keyword = Token::KeywordToken::Keyword::Struct}});
+                else if (identifier == "using")
+                    tokens.push_back({.type = Token::Type::Keyword, .keywordToken = { .keyword = Token::KeywordToken::Keyword::Using}});
+
+                // Check for built-in types
+                else if (identifier == "u8")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Unsigned8Bit }});
+                else if (identifier == "s8")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Signed8Bit }});
+                else if (identifier == "u16")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Unsigned16Bit }});
+                else if (identifier == "s16")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Signed16Bit }});
+                else if (identifier == "u32")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Unsigned32Bit }});
+                else if (identifier == "s32")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Signed32Bit }});
+                else if (identifier == "u64")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Unsigned64Bit }});
+                else if (identifier == "s64")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Signed64Bit }});
+                else if (identifier == "u128")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Unsigned128Bit }});
+                else if (identifier == "s128")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Signed128Bit }});
+                else if (identifier == "float")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Float }});
+                else if (identifier == "double")
+                    tokens.push_back({.type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Double }});
+
+                // If it's not a keyword and a builtin type, it has to be an identifier
+
+                else
+                    tokens.push_back({.type = Token::Type::Identifier, .identifierToken = { .identifier = identifier}});
+
+                offset += identifier.length();
+            } else if (std::isdigit(c)) {
+                char *end = nullptr;
+                std::strtoull(&code[offset], &end, 0);
+
+                auto integer = parseInt(std::string_view(&code[offset], end));// matchTillInvalid(&code[offset], [](char c) -> bool { return std::isdigit(c); });
+
+                if (!integer.has_value())
+                    return { ResultLexicalError, {}};
+
+                tokens.push_back({.type = Token::Type::Integer, .integerToken = { .integer = integer.value() }});
+                offset += (end - &code[offset]);
+            } else return { ResultLexicalError, {}};
+        }
+
+        tokens.push_back({.type = Token::Type::EndOfProgram});
+
+        return { ResultSuccess, tokens };
+    }
+}

source/parser/parser.cpp

@@ -0,0 +1,178 @@
+#include "parser/parser.hpp"
+
+#include <optional>
+
+namespace hex::lang {
+
+    Parser::Parser() {
+
+    }
+
+    using TokenIter = std::vector<Token>::const_iterator;
+
+    std::vector<ASTNode*> parseTillToken(TokenIter &curr, Token::Type endTokenType);
+
+    bool tryConsume(TokenIter &curr, std::initializer_list<Token::Type> tokenTypes) {
+        std::vector<Token>::const_iterator originalPosition = curr;
+
+        for (const auto& type : tokenTypes) {
+            if (curr->type != type) {
+                curr = originalPosition;
+                return false;
+            }
+            curr++;
+        }
+
+        return true;
+    }
+
+
+    ASTNode* parseBuiltinVariableDecl(TokenIter &curr) {
+        return new ASTNodeVariableDecl(curr[-3].typeToken.type, curr[-2].identifierToken.identifier);
+    }
+
+    ASTNode* parseCustomTypeVariableDecl(TokenIter &curr) {
+        return new ASTNodeVariableDecl(Token::TypeToken::Type::CustomType, curr[-2].identifierToken.identifier, curr[-3].identifierToken.identifier);
+    }
+
+    std::optional<ASTNode*> parseStruct(TokenIter &curr) {
+        const std::string &structName = curr[-2].identifierToken.identifier;
+        std::vector<ASTNode*> nodes;
+        std::optional<u64> offset = { };
+
+        while (!tryConsume(curr, {Token::Type::ScopeClose})) {
+            if (tryConsume(curr, {Token::Type::Type, Token::Type::Identifier, Token::Type::EndOfExpression}))
+                nodes.push_back(parseBuiltinVariableDecl(curr));
+            else if (tryConsume(curr, {Token::Type::Identifier, Token::Type::Identifier, Token::Type::EndOfExpression}))
+                nodes.push_back(parseCustomTypeVariableDecl(curr));
+            else break;
+        }
+
+        if (tryConsume(curr, {Token::Type::Operator})) {
+            if (curr[-1].operatorToken.op == Token::OperatorToken::Operator::AtDeclaration) {
+                if (tryConsume(curr, {Token::Type::Integer})) {
+                    offset = curr[-1].integerToken.integer;
+                } else {
+                    for(auto &node : nodes) delete node;
+                    return { };
+                }
+            } else {
+                for(auto &node : nodes) delete node;
+                return { };
+            }
+        }
+
+        if (!tryConsume(curr, {Token::Type::EndOfExpression})) {
+            for(auto &node : nodes) delete node;
+            return { };
+        }
+
+        return new ASTNodeStruct(structName, nodes, offset);
+    }
+
+    ASTNode *parseScope(TokenIter &curr) {
+        return new ASTNodeScope(parseTillToken(curr, Token::Type::ScopeClose));
+    }
+
+    std::optional<ASTNode*> parseUsingDeclaration(TokenIter &curr) {
+        auto keyword = curr[-5].keywordToken;
+        auto name = curr[-4].identifierToken;
+        auto op = curr[-3].operatorToken;
+
+        if (keyword.keyword != Token::KeywordToken::Keyword::Using)
+            return { };
+
+        if (op.op != Token::OperatorToken::Operator::Assignment)
+            return { };
+
+        if (curr[-2].type == Token::Type::Type) {
+            auto type = curr[-2].typeToken;
+
+            return new ASTNodeTypeDecl(type.type, name.identifier);
+        } else if (curr[-2].type == Token::Type::Identifier) {
+            auto customType = curr[-2].identifierToken;
+
+            return new ASTNodeTypeDecl(Token::TypeToken::Type::CustomType, name.identifier, customType.identifier);
+        }
+
+        return { };
+    }
+
+    std::optional<std::vector<ASTNode*>> parseStatement(TokenIter &curr) {
+        std::vector<ASTNode*> program;
+
+        if (tryConsume(curr, { Token::Type::Keyword, Token::Type::Identifier, Token::Type::ScopeOpen })) {
+            if (curr[-3].keywordToken.keyword == Token::KeywordToken::Keyword::Struct) {
+                auto structAst = parseStruct(curr);
+
+                if (!structAst.has_value()) {
+                    for(auto &node : program) delete node;
+                    return { };
+                }
+
+                program.push_back(structAst.value());
+            }
+
+            return program;
+        } else if (tryConsume(curr, { Token::Type::ScopeOpen })) {
+            program.push_back(parseScope(curr));
+
+            return program;
+        } else if (tryConsume(curr, { Token::Type::Keyword, Token::Type::Identifier, Token::Type::Operator, Token::Type::Type, Token::Type::EndOfExpression})) {
+            auto usingDecl = parseUsingDeclaration(curr);
+
+            if (!usingDecl.has_value()) {
+                for(auto &node : program) delete node;
+                return { };
+            }
+
+            program.push_back(usingDecl.value());
+
+            return program;
+        } else if (tryConsume(curr, { Token::Type::Keyword, Token::Type::Identifier, Token::Type::Operator, Token::Type::Identifier, Token::Type::EndOfExpression})) {
+            auto usingDecl = parseUsingDeclaration(curr);
+
+            if (!usingDecl.has_value()) {
+                for(auto &node : program) delete node;
+                return { };
+            }
+
+            program.push_back(usingDecl.value());
+
+            return program;
+        }
+        else {
+            for(auto &node : program) delete node;
+            return { };
+        }
+    }
+
+    std::vector<ASTNode*> parseTillToken(TokenIter &curr, Token::Type endTokenType) {
+        std::vector<ASTNode*> program;
+
+        while (curr->type != endTokenType) {
+            auto newTokens = parseStatement(curr);
+
+            if (!newTokens.has_value())
+                break;
+
+            program.insert(program.end(), newTokens->begin(), newTokens->end());
+        }
+
+        curr++;
+
+        return program;
+    }
+
+    std::pair<Result, std::vector<ASTNode*>> Parser::parse(const std::vector<Token> &tokens) {
+        auto currentToken = tokens.begin();
+
+        auto program = parseTillToken(currentToken, Token::Type::EndOfProgram);
+
+        if (program.empty())
+            return { ResultParseError, { } };
+
+        return { ResultSuccess, program };
+    }
+
+}

source/window.cpp

@@ -0,0 +1,136 @@
+#include "window.hpp"
+
+#include <iostream>
+
+#include "imgui.h"
+#include "imgui_impl_glfw.h"
+#include "imgui_impl_opengl3.h"
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+namespace hex {
+
+    Window::Window() {
+        this->initGLFW();
+        this->initImGui();
+    }
+
+    Window::~Window() {
+        this->deinitImGui();
+        this->deinitGLFW();
+
+        for (auto &view : this->m_views)
+            delete view;
+    }
+
+    void Window::loop() {
+        while (!glfwWindowShouldClose(this->m_window)) {
+            this->frameBegin();
+
+            for (auto &view : this->m_views)
+                view->createView();
+
+            this->frameEnd();
+        }
+    }
+
+
+    void Window::frameBegin() {
+        glfwPollEvents();
+
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplGlfw_NewFrame();
+        ImGui::NewFrame();
+
+        ImGuiWindowFlags windowFlags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking;
+        ImGuiViewport* viewport = ImGui::GetMainViewport();
+        ImGui::SetNextWindowPos(viewport->GetWorkPos());
+        ImGui::SetNextWindowSize(viewport->GetWorkSize());
+        ImGui::SetNextWindowViewport(viewport->ID);
+        ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
+        ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
+        windowFlags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
+        windowFlags |= ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
+
+        ImGui::Begin("DockSpace", nullptr, windowFlags);
+        ImGui::PopStyleVar(2);
+        ImGui::DockSpace(ImGui::GetID("MainDock"), ImVec2(0.0f, 0.0f), ImGuiDockNodeFlags_None);
+
+        ImGui::BeginMenuBar();
+
+        for (auto &view : this->m_views)
+            view->createMenu();
+
+        ImGui::EndMenuBar();
+
+        ImGui::End();
+    }
+
+    void Window::frameEnd() {
+        ImGui::Render();
+        int display_w, display_h;
+        glfwGetFramebufferSize(this->m_window, &display_w, &display_h);
+        glViewport(0, 0, display_w, display_h);
+        glClearColor(0.45f, 0.55f, 0.60f, 1.00f);
+        glClear(GL_COLOR_BUFFER_BIT);
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+        glfwSwapBuffers(this->m_window);
+    }
+
+    static void glfw_error_callback(int error, const char* description)
+    {
+        fprintf(stderr, "Glfw Error %d: %s\n", error, description);
+    }
+
+
+     void Window::initGLFW() {
+        glfwSetErrorCallback(glfw_error_callback);
+        if (!glfwInit())
+            throw std::runtime_error("Failed to initialize GLFW!");
+
+#ifdef __APPLE__
+        glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
+#endif
+
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+        glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
+         glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+        this->m_window = glfwCreateWindow(1280, 720, "ImHex", nullptr, nullptr);
+
+        if (this->m_window == nullptr)
+            throw std::runtime_error("Failed to create window!");
+
+        glfwMakeContextCurrent(this->m_window);
+        glfwSwapInterval(1);
+
+        if (gladLoadGL() == 0)
+            throw std::runtime_error("Failed to initialize OpenGL loader!");
+    }
+
+    void Window::initImGui() {
+        IMGUI_CHECKVERSION();
+        ImGui::CreateContext();
+        ImGuiIO& io = ImGui::GetIO(); (void)io;
+        io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
+
+        ImGui::StyleColorsDark();
+
+        ImGui_ImplGlfw_InitForOpenGL(this->m_window, true);
+        ImGui_ImplOpenGL3_Init("#version 150");
+    }
+
+    void Window::deinitGLFW() {
+        glfwDestroyWindow(this->m_window);
+        glfwTerminate();
+    }
+
+    void Window::deinitImGui() {
+        ImGui_ImplOpenGL3_Shutdown();
+        ImGui_ImplGlfw_Shutdown();
+        ImGui::DestroyContext();
+    }
+
+}