ADD: OpenGLWrapper

CMakeLists.txt

@@ -80,6 +80,13 @@ target_include_directories(glad PUBLIC third_party/glad/include)
 add_library(Engine STATIC
         engine/src/core/Window.h
         engine/src/core/Window.cpp
+        engine/src/core/Application.cpp
+        engine/src/core/Application.h
+        engine/src/core/EngineConfig.h
+        engine/src/utils/openglWrapper/GLStateCache.cpp
+        engine/src/utils/openglWrapper/GLStateCache.h
+        engine/src/utils/openglWrapper/GLRenderState.cpp
+        engine/src/utils/openglWrapper/GLRenderState.h
 )
 target_include_directories(Engine PUBLIC engine/src)
 target_link_libraries(Engine PUBLIC OpenGL::GL glfw glad glm::glm imgui)
@@ -87,6 +94,8 @@ target_link_libraries(Engine PUBLIC OpenGL::GL glfw glad glm::glm imgui)
 # --- Executable ---
 add_executable(ColorRace
         game/src/main.cpp
+        game/src/ColorRaceApp.cpp
+        game/src/ColorRaceApp.h
 )
 
 target_link_libraries(ColorRace PRIVATE

engine/src/core/Application.cpp

@@ -0,0 +1,37 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#include "Application.h"
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+#include "utils/openglWrapper/GLStateCache.h"
+
+namespace engine {
+    Application::Application(const EngineConfig& config) : m_config(config) {
+        m_window = std::make_unique<Window>(config);
+    }
+
+    Application::~Application() = default;
+
+    void Application::run() {
+        auto lastTime = static_cast<float>(glfwGetTime());
+
+        while (!m_window->shouldClose()) {
+            const auto currentTime = static_cast<float>(glfwGetTime());
+            const float deltaTime = currentTime - lastTime;
+            lastTime = currentTime;
+
+            m_window->pollEvents();
+
+            onUpdate(deltaTime);
+
+            GLStateCache::clearFrameBuffer(m_config.clearColor);
+
+            onRender();
+
+            m_window->swapBuffers();
+        }
+    }
+}

engine/src/core/Application.h

@@ -0,0 +1,37 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#ifndef COLORRACE_APPLICATION_H
+#define COLORRACE_APPLICATION_H
+#include <memory>
+#include <string>
+
+#include "EngineConfig.h"
+#include "Window.h"
+
+
+
+namespace engine {
+    class Application {
+    public:
+        Application(const EngineConfig& config);
+        virtual ~Application();
+
+        void run();
+
+    protected:
+        virtual void onUpdate(float deltaTime) {}
+        virtual void onRender() {}
+
+    private:
+        EngineConfig m_config;
+        std::unique_ptr<Window> m_window;
+    };
+
+}
+
+
+
+
+#endif //COLORRACE_APPLICATION_H

engine/src/core/EngineConfig.h

@@ -0,0 +1,28 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#ifndef COLORRACE_ENGINECONFIG_H
+#define COLORRACE_ENGINECONFIG_H
+#include <string>
+
+#include "glm/vec4.hpp"
+
+namespace engine {
+    struct EngineConfig {
+        int windowWidth = 1280;
+        int windowHeight = 720;
+        std::string windowTitle = "Engine";
+
+        bool fullscreen = false;
+        bool vsync = true;
+        bool msaa = true;
+        int msaaSamples = 4;
+
+        glm::vec4 clearColor = {0.1f, 0.1f, 0.15f, 1.0f};
+
+        bool debugContext = true; // GL_DEBUG_OUTPUT an/aus
+    };
+}
+
+#endif //COLORRACE_ENGINECONFIG_H

engine/src/core/Window.cpp

@@ -6,8 +6,10 @@
 
 #include <iostream>
 
+#include "EngineConfig.h"
 #include "glad/glad.h"
 #include "GLFW/glfw3.h"
+#include "utils/openglWrapper/GLStateCache.h"
 
 namespace engine {
     static void GLAPIENTRY DebugCallback(GLenum source, GLenum type, GLuint id,
@@ -17,31 +19,47 @@ namespace engine {
         std::cerr << "[GL DEBUG] " << message << "\n";
     }
 
-    Window::Window(int width, int height, const std::string& title) {
+    Window::Window(const EngineConfig& config) {
         if (!glfwInit()) throw std::runtime_error("GLFW init failed");
 
         glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
         glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
         glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
-        glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GLFW_TRUE);
+        glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, config.debugContext ? GLFW_TRUE : GLFW_FALSE);
 
-        m_handle = glfwCreateWindow(width, height, title.c_str(), nullptr, nullptr);
+        if (config.msaa) {
+            glfwWindowHint(GLFW_SAMPLES, config.msaaSamples);
+        }
+
+        GLFWmonitor* monitor = config.fullscreen ? glfwGetPrimaryMonitor() : nullptr;
+        m_handle = glfwCreateWindow(config.windowWidth, config.windowHeight, config.windowTitle.c_str(), monitor, nullptr);
         if (!m_handle) {
             glfwTerminate();
             throw std::runtime_error("Window creation failed");
         }
 
         glfwMakeContextCurrent(m_handle);
+        glfwSwapInterval(config.vsync ? 1 : 0); // VSync
 
         if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
             throw std::runtime_error("GLAD init failed");
         }
 
+        GLStateCache::init();
+
+        if (config.debugContext) {
             glEnable(GL_DEBUG_OUTPUT);
             glEnable(GL_DEBUG_OUTPUT_SYNCHRONOUS);
             glDebugMessageCallback(DebugCallback, nullptr);
+        }
 
-        glViewport(0, 0, width, height);
+        if (config.msaa) {
+            glEnable(GL_MULTISAMPLE);
+        }
+
+
+
+        glViewport(0, 0, config.windowWidth, config.windowHeight);
     }
 
     Window::~Window() {

engine/src/core/Window.h

@@ -8,12 +8,14 @@
 #pragma once
 #include <string>
 
+#include "EngineConfig.h"
+
 struct GLFWwindow;
 
 namespace engine {
     class Window {
     public:
-        Window(int width, int height, const std::string& title);
+        Window(const EngineConfig& config);
         ~Window();
 
         bool shouldClose() const;

engine/src/utils/openglWrapper/GLRenderState.cpp

@@ -0,0 +1,17 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#include "GLRenderState.h"
+
+#include "GLStateCache.h"
+
+namespace engine {
+    void GLRenderState::apply() const {
+        GLStateCache::setFaceCulling(backfaceCulling || frontFaceCulling, frontFaceCulling);
+        GLStateCache::setAntialiasing(antialiasing);
+        GLStateCache::setAlphaBlending(alphaBlending);
+        GLStateCache::setDepthTest(depthTesting);
+        GLStateCache::setDepthWriting(depthWriting);
+    }
+}

engine/src/utils/openglWrapper/GLRenderState.h

@@ -0,0 +1,22 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#ifndef COLORRACE_GLRENDERSTATE_H
+#define COLORRACE_GLRENDERSTATE_H
+
+namespace engine {
+    struct GLRenderState {
+        bool backfaceCulling = false;
+        bool frontFaceCulling = false;
+        bool alphaBlending = false;
+        bool antialiasing = false;
+        bool depthTesting = true;   // in 3D meist sinnvoller Default
+        bool depthWriting = true;
+
+        void apply() const;
+    };
+
+}
+
+#endif //COLORRACE_GLRENDERSTATE_H

engine/src/utils/openglWrapper/GLStateCache.cpp

@@ -0,0 +1,115 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#include "GLStateCache.h"
+
+#include <GL/gl.h>
+
+namespace engine {
+    void GLStateCache::init() {
+        glDisable(GL_CULL_FACE);
+        glDisable(GL_MULTISAMPLE);
+        glDisable(GL_BLEND);
+        glDisable(GL_DEPTH_TEST);
+        glDepthMask(GL_TRUE);
+        glDisable(GL_SCISSOR_TEST);
+        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+    }
+
+    void GLStateCache::setFaceCulling(bool enabled, bool frontFace) {
+        if (enabled) {
+            if (!s_cullingFaces) {
+                glEnable(GL_CULL_FACE);
+                s_cullingFaces = true;
+            }
+            if (frontFace != s_frontFaceCulling) {
+                glCullFace(frontFace ? GL_FRONT : GL_BACK);
+                s_frontFaceCulling = frontFace;
+            }
+        } else if (s_cullingFaces) {
+            glDisable(GL_CULL_FACE);
+            s_cullingFaces = false;
+        }
+    }
+
+    void GLStateCache::setAntialiasing(bool enabled) {
+        if (enabled == s_antialiasing) return;
+        enabled ? glEnable(GL_MULTISAMPLE) : glDisable(GL_MULTISAMPLE);
+        s_antialiasing = enabled;
+    }
+
+    void GLStateCache::setAlphaBlending(bool enabled) {
+        if (enabled == s_alphaBlending && !s_additiveBlending) return;
+        if (enabled) {
+            glEnable(GL_BLEND);
+            glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+            s_alphaBlending = true;
+            s_additiveBlending = false;
+        } else if (s_alphaBlending) {
+            glDisable(GL_BLEND);
+            s_alphaBlending = false;
+        }
+    }
+
+    void GLStateCache::setAdditiveBlending(bool enabled) {
+        if (enabled && !s_additiveBlending) {
+            glEnable(GL_BLEND);
+            glBlendFunc(GL_SRC_ALPHA, GL_ONE);
+            s_additiveBlending = true;
+            s_alphaBlending = false;
+        } else if (!enabled && s_additiveBlending) {
+            glDisable(GL_BLEND);
+            s_additiveBlending = false;
+        }
+    }
+
+    void GLStateCache::setDepthTest(bool enabled) {
+        if (enabled == s_depthTest) return;
+        enabled ? glEnable(GL_DEPTH_TEST) : glDisable(GL_DEPTH_TEST);
+        s_depthTest = enabled;
+    }
+
+    void GLStateCache::setDepthWriting(bool enabled) {
+        if (enabled == s_depthWriting) return;
+        glDepthMask(enabled ? GL_TRUE : GL_FALSE);
+        s_depthWriting = enabled;
+    }
+
+    void GLStateCache::setScissorTest(bool enabled, int x, int y, int width, int height) {
+        if (enabled && !s_scissorTest) {
+            glEnable(GL_SCISSOR_TEST);
+            s_scissorTest = true;
+        } else if (!enabled && s_scissorTest) {
+            glDisable(GL_SCISSOR_TEST);
+            s_scissorTest = false;
+            return;
+        }
+        if (enabled && (x != s_scissorBounds[0] || y != s_scissorBounds[1] ||
+                        width != s_scissorBounds[2] || height != s_scissorBounds[3])) {
+            glScissor(x, y, width, height);
+            s_scissorBounds[0] = x; s_scissorBounds[1] = y;
+            s_scissorBounds[2] = width; s_scissorBounds[3] = height;
+                        }
+    }
+
+    void GLStateCache::setWireframe(bool enabled) {
+        if (enabled == s_wireframe) return;
+        glPolygonMode(GL_FRONT_AND_BACK, enabled ? GL_LINE : GL_FILL);
+        s_wireframe = enabled;
+    }
+
+    void GLStateCache::bindTexture2D(unsigned int textureId, int slot) {
+        glActiveTexture(GL_TEXTURE0 + slot);
+        glBindTexture(GL_TEXTURE_2D, textureId);
+    }
+
+    void GLStateCache::clearColorBuffer() { glClear(GL_COLOR_BUFFER_BIT); }
+    void GLStateCache::clearDepthBuffer() { glClear(GL_DEPTH_BUFFER_BIT); }
+    void GLStateCache::clearFrameBuffer() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); }
+
+    void GLStateCache::clearFrameBuffer(glm::vec4 color) {
+        glClearColor(color.r, color.g, color.b, color.a);
+        clearFrameBuffer();
+    }
+}

engine/src/utils/openglWrapper/GLStateCache.h

@@ -0,0 +1,44 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#ifndef COLORRACE_GLSTATECACHE_H
+#define COLORRACE_GLSTATECACHE_H
+#include "glm/vec4.hpp"
+
+namespace engine {
+    class GLStateCache {
+    public:
+        static void init(); // einmal nach GLAD-Init aufrufen, um Startzustand zu setzen
+
+        static void setFaceCulling(bool enabled, bool frontFace);
+        static void setAntialiasing(bool enabled);
+        static void setAlphaBlending(bool enabled);
+        static void setAdditiveBlending(bool enabled);
+        static void setDepthTest(bool enabled);
+        static void setDepthWriting(bool enabled);
+        static void setScissorTest(bool enabled, int x = 0, int y = 0, int width = 0, int height = 0);
+        static void setWireframe(bool enabled);
+
+        static void bindTexture2D(unsigned int textureId, int slot);
+
+        static void clearColorBuffer();
+        static void clearDepthBuffer();
+        static void clearFrameBuffer();
+        static void clearFrameBuffer(glm::vec4 color);
+    private:
+        inline static bool s_cullingFaces = false;
+        inline static bool s_frontFaceCulling = false;
+        inline static bool s_antialiasing = false;
+        inline static bool s_alphaBlending = false;
+        inline static bool s_additiveBlending = false;
+        inline static bool s_depthTest = false;
+        inline static bool s_depthWriting = true;
+        inline static bool s_scissorTest = false;
+        inline static bool s_wireframe = false;
+        inline static int s_scissorBounds[4] = {0, 0, 0, 0};
+        inline static glm::vec4 s_clearColor = {0.0f, 0.0f, 0.0f, 1.0f};
+    };
+}
+
+#endif //COLORRACE_GLSTATECACHE_H

game/src/ColorRaceApp.cpp

@@ -0,0 +1,12 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#include "ColorRaceApp.h"
+void ColorRaceApp::onUpdate(float deltaTime) {
+
+}
+
+void ColorRaceApp::onRender() {
+
+}

game/src/ColorRaceApp.h

@@ -0,0 +1,29 @@
+//
+// Created by sebastian on 29.07.26.
+//
+
+#ifndef COLORRACE_COLORRACEAPP_H
+#define COLORRACE_COLORRACEAPP_H
+#include "core/Application.h"
+
+
+class ColorRaceApp : public engine::Application {
+public:
+    static engine::EngineConfig makeConfig() {
+        engine::EngineConfig config;
+
+        config.windowWidth = 1280;
+        config.windowHeight = 720;
+        config.windowTitle = "ColorRace";
+        config.clearColor = glm::vec4(0.1f, 0.1f, 0.15f, 1.0f);
+        config.vsync = true;
+        return config;
+    }
+    ColorRaceApp() : Application(makeConfig()) {}
+protected:
+    void onUpdate(float deltaTime) override;
+    void onRender() override;
+};
+
+
+#endif //COLORRACE_COLORRACEAPP_H

game/src/main.cpp

@@ -1,20 +1,8 @@
-#include <iostream>
+#include "ColorRaceApp.h"
-#include "core/Window.h"
-#include "glad/glad.h"
-
-
 // TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
 
 int main() {
-    engine::Window window(1280, 720, "ColorRace");
+    ColorRaceApp app;
-
+    app.run();
-    while (!window.shouldClose()) {
-        window.pollEvents();
-
-        glClearColor(0.1f, 0.1f, 0.15f, 1.0f);
-        glClear(GL_COLOR_BUFFER_BIT);
-
-        window.swapBuffers();
-    }
     return 0;
 }