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feat: Added support for OpenGL post processing shaders

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This commit is contained in:
WerWolv 2025-01-20 21:24:25 +01:00
parent c117d9b3e5
commit 07e29f2030
4 changed files with 137 additions and 13 deletions
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2
lib/libimhex/include/hex/helpers/opengl.hpp
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@ -807,6 +807,8 @@ namespace hex::gl {
void bind() const;
void unbind() const;
bool isValid() const { return m_program != 0; }
void setUniform(std::string_view name, const int &value);
void setUniform(std::string_view name, const float &value);

3
lib/libimhex/source/helpers/opengl.cpp
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@ -81,6 +81,9 @@ namespace hex::gl {
std::vector<char> log(512);
glGetShaderInfoLog(m_program, log.size(), nullptr, log.data());
log::error("Failed to link shader: {}", log.data());
glDeleteProgram(m_program);
m_program = 0;
}
}

7
main/gui/include/window.hpp
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@ -9,6 +9,7 @@
#include <hex/ui/view.hpp>
#include <jthread.hpp>
#include <hex/helpers/opengl.hpp>
struct GLFWwindow;
struct ImGuiSettingsHandler;
@ -47,6 +48,10 @@ namespace hex {
void exitImGui();
void registerEventHandlers();
void loadPostProcessingShader();
void drawImGui();
void drawWithShader();
GLFWwindow *m_window = nullptr;
@ -72,6 +77,8 @@ namespace hex {
std::atomic<bool> m_sleepFlag;
std::condition_variable m_sleepCondVar;
std::mutex m_sleepMutex;
gl::Shader m_postProcessingShader;
};
}

138
main/gui/source/window/window.cpp
View File

@ -28,6 +28,7 @@
#include <imgui_internal.h>
#include <imgui_impl_glfw.h>
#include <imgui_impl_opengl3.h>
#include <imgui_impl_opengl3_loader.h>
#include <hex/ui/imgui_imhex_extensions.h>
#include <implot.h>
#include <implot_internal.h>
@ -43,6 +44,7 @@
#include <wolv/utils/guards.hpp>
#include <fmt/printf.h>
#include <fmt/chrono.h>
#include <hex/helpers/opengl.hpp>
namespace hex {
@ -75,6 +77,7 @@ namespace hex {
this->initImGui();
this->setupNativeWindow();
this->registerEventHandlers();
this->loadPostProcessingShader();
ContentRegistry::Settings::impl::store();
ContentRegistry::Settings::impl::load();
@ -151,6 +154,36 @@ namespace hex {
});
}
void Window::loadPostProcessingShader() {
for (const auto &folder : paths::Resources.all()) {
auto vertexShaderPath = folder / "shader.vert";
auto fragmentShaderPath = folder / "shader.frag";
if (!wolv::io::fs::exists(vertexShaderPath))
continue;
if (!wolv::io::fs::exists(fragmentShaderPath))
continue;
auto vertexShaderFile = wolv::io::File(vertexShaderPath, wolv::io::File::Mode::Read);
if (!vertexShaderFile.isValid())
continue;
auto fragmentShaderFile = wolv::io::File(fragmentShaderPath, wolv::io::File::Mode::Read);
if (!fragmentShaderFile.isValid())
continue;
const auto vertexShaderSource = vertexShaderFile.readString();
const auto fragmentShaderSource = fragmentShaderFile.readString();
m_postProcessingShader = gl::Shader(vertexShaderSource, fragmentShaderSource);
if (!m_postProcessingShader.isValid())
continue;
break;
}
}
void handleException() {
try {
throw;
@ -758,20 +791,12 @@ namespace hex {
glfwMakeContextCurrent(backupContext);
if (shouldRender) {
auto* drawData = ImGui::GetDrawData();
if (m_postProcessingShader.isValid())
drawWithShader();
else
drawImGui();
// Avoid accidentally clearing the viewport when the application is minimized,
// otherwise the OS will display an empty frame during deminimization on macOS
if (drawData->DisplaySize.x != 0 && drawData->DisplaySize.y != 0) {
int displayWidth, displayHeight;
glfwGetFramebufferSize(m_window, &displayWidth, &displayHeight);
glViewport(0, 0, displayWidth, displayHeight);
glClearColor(0.00F, 0.00F, 0.00F, 0.00F);
glClear(GL_COLOR_BUFFER_BIT);
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
glfwSwapBuffers(m_window);
}
glfwSwapBuffers(m_window);
}
// Process layout load requests
@ -782,6 +807,92 @@ namespace hex {
ImGui::GetIO().FontGlobalScale = 1.0F / ImHexApi::System::getBackingScaleFactor();
}
void Window::drawImGui() {
auto* drawData = ImGui::GetDrawData();
// Avoid accidentally clearing the viewport when the application is minimized,
// otherwise the OS will display an empty frame during deminimization on macOS
if (drawData->DisplaySize.x != 0 && drawData->DisplaySize.y != 0) {
int displayWidth, displayHeight;
glfwGetFramebufferSize(m_window, &displayWidth, &displayHeight);
glViewport(0, 0, displayWidth, displayHeight);
glClearColor(0.00F, 0.00F, 0.00F, 0.00F);
glClear(GL_COLOR_BUFFER_BIT);
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
}
}
void Window::drawWithShader() {
int displayWidth, displayHeight;
glfwGetFramebufferSize(m_window, &displayWidth, &displayHeight);
GLuint fbo, texture;
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
// Create a texture to render into
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, displayWidth, displayHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
// Attach the texture to the framebuffer
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
// Check if framebuffer is complete
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
log::error("Framebuffer is not complete!");
}
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
drawImGui();
glBindFramebuffer(GL_FRAMEBUFFER, 0);
GLuint quadVAO, quadVBO;
float quadVertices[] = {
// positions // texCoords
-1.0f, 1.0f, 0.0f, 1.0f,
-1.0f, -1.0f, 0.0f, 0.0f,
1.0f, -1.0f, 1.0f, 0.0f,
-1.0f, 1.0f, 0.0f, 1.0f,
1.0f, -1.0f, 1.0f, 0.0f,
1.0f, 1.0f, 1.0f, 1.0f
};
glGenVertexArrays(1, &quadVAO);
glGenBuffers(1, &quadVBO);
glBindVertexArray(quadVAO);
glBindBuffer(GL_ARRAY_BUFFER, quadVBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), quadVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float)));
glBindVertexArray(0);
m_postProcessingShader.bind();
glBindVertexArray(quadVAO);
glBindTexture(GL_TEXTURE_2D, texture);
glClearColor(0.00F, 0.00F, 0.00F, 0.00F);
glClear(GL_COLOR_BUFFER_BIT);
glDrawArrays(GL_TRIANGLES, 0, 6);
m_postProcessingShader.unbind();
glDeleteVertexArrays(1, &quadVAO);
glDeleteBuffers(1, &quadVBO);
glDeleteTextures(1, &texture);
glDeleteFramebuffers(1, &fbo);
}
void Window::initGLFW() {
auto initialWindowProperties = ImHexApi::System::getInitialWindowProperties();
glfwSetErrorCallback([](int error, const char *desc) {
@ -813,6 +924,7 @@ namespace hex {
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE);
glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_API);
glfwWindowHint(GLFW_TRANSPARENT_FRAMEBUFFER, GLFW_TRUE);
if (initialWindowProperties.has_value()) {
glfwWindowHint(GLFW_MAXIMIZED, initialWindowProperties->maximized);