sys: Added FPS limit, some power saving

#189

include/window.hpp

@@ -46,9 +46,12 @@ namespace hex {
 
         float m_globalScale = 1.0f, m_fontScale = 1.0f;
         bool m_fpsVisible = false;
+        double m_targetFps;
         bool m_demoWindowOpen = false;
         bool m_layoutConfigured = false;
 
+        double m_lastFrameTime;
+
         static inline std::tuple<int, int> s_currShortcut = { -1, -1 };
 
         std::list<std::string> m_recentFiles;

plugins/builtin/source/content/settings_entries.cpp

@@ -61,6 +61,17 @@ namespace hex::plugin::builtin {
             return false;
         });
 
+        ContentRegistry::Settings::add("hex.builtin.setting.interface", "hex.builtin.setting.interface.fps", 60, [](auto name, nlohmann::json &setting) {
+            static int fps = setting.is_number() ? static_cast<int>(setting) : 60;
+
+            if (ImGui::SliderInt(name.data(), &fps, 15, 60)) {
+                setting = fps;
+                return true;
+            }
+
+            return false;
+        });
+
     }
 
 }

plugins/builtin/source/lang/de_DE.cpp

@@ -463,6 +463,7 @@ namespace hex::plugin::builtin {
                         { "hex.builtin.setting.interface.color.light", "Hell" },
                         { "hex.builtin.setting.interface.color.classic", "Klassisch" },
                     { "hex.builtin.setting.interface.language", "Sprache" },
+                    { "hex.builtin.setting.interface.fps", "FPS Limite" },
 
                 { "hex.builtin.provider.file.path", "Dateipfad" },
                 { "hex.builtin.provider.file.size", "Größe" },

plugins/builtin/source/lang/en_US.cpp

@@ -463,6 +463,7 @@ namespace hex::plugin::builtin {
                         { "hex.builtin.setting.interface.color.light", "Light" },
                         { "hex.builtin.setting.interface.color.classic", "Classic" },
                     { "hex.builtin.setting.interface.language", "Language" },
+                    { "hex.builtin.setting.interface.fps", "FPS Limit" },
 
                 { "hex.builtin.provider.file.path", "File path" },
                 { "hex.builtin.provider.file.size", "Size" },

plugins/builtin/source/lang/it_IT.cpp

@@ -463,6 +463,7 @@ namespace hex::plugin::builtin {
                         { "hex.builtin.setting.interface.color.light", "Chiaro" },
                         { "hex.builtin.setting.interface.color.classic", "Classico" },
                     { "hex.builtin.setting.interface.language", "Lingua" },
+                { "hex.builtin.setting.interface.fps", "FPS limite" },
 
                 { "hex.builtin.provider.file.path", "Percorso del File" },
                 { "hex.builtin.provider.file.size", "Dimensione" },

source/window.cpp

@@ -3,9 +3,11 @@
 #include <hex.hpp>
 #include <hex/api/content_registry.hpp>
 
+#include <chrono>
 #include <iostream>
 #include <numeric>
 #include <typeinfo>
+#include <thread>
 
 #include <imgui.h>
 #define IMGUI_DEFINE_MATH_OPERATORS
@@ -26,6 +28,8 @@
 
 namespace hex {
 
+    using namespace std::literals::chrono_literals;
+
     void *ImHexSettingsHandler_ReadOpenFn(ImGuiContext *ctx, ImGuiSettingsHandler *, const char *) {
         return ctx; // Unused, but the return value has to be non-null
     }
@@ -57,7 +61,7 @@ namespace hex {
         this->initGLFW();
         this->initImGui();
 
-        EventManager::subscribe(Events::SettingsChanged, this, [](auto) -> std::any {
+        EventManager::subscribe(Events::SettingsChanged, this, [this](auto) -> std::any {
             {
                 auto theme = ContentRegistry::Settings::getSetting("hex.builtin.setting.interface", "hex.builtin.setting.interface.color");
 
@@ -91,6 +95,13 @@ namespace hex {
                     LangEntry::loadLanguage(static_cast<std::string>(language));
             }
 
+            {
+                auto targetFps = ContentRegistry::Settings::getSetting("hex.builtin.setting.interface", "hex.builtin.setting.interface.fps");
+
+                if (targetFps.is_number())
+                    this->m_targetFps = targetFps;
+            }
+
             return { };
         });
 
@@ -156,6 +167,7 @@ namespace hex {
     }
 
     void Window::loop() {
+        this->m_lastFrameTime = glfwGetTime();
         while (!glfwWindowShouldClose(this->m_window)) {
             this->frameBegin();
 
@@ -245,6 +257,10 @@ namespace hex {
     }
 
     void Window::frameBegin() {
+
+        if (!glfwGetWindowAttrib(this->m_window, GLFW_VISIBLE) || glfwGetWindowAttrib(this->m_window, GLFW_ICONIFIED))
+            glfwWaitEvents();
+
         glfwPollEvents();
 
         ImGui_ImplOpenGL3_NewFrame();
@@ -373,6 +389,10 @@ namespace hex {
         glfwMakeContextCurrent(backup_current_context);
 
         glfwSwapBuffers(this->m_window);
+
+        while (glfwGetTime() < this->m_lastFrameTime + (1 / this->m_targetFps))
+            std::this_thread::sleep_for(500us);
+        this->m_lastFrameTime = glfwGetTime();
     }
 
     void Window::drawWelcomeScreen() {