添加opengl框架并测试渲染第一个三角形

.gitmodules

@@ -4,3 +4,10 @@
 [submodule "Hazel/vendor/SDL"]
 	path = Hazel/vendor/SDL
 	url = https://github.com/libsdl-org/SDL
+[submodule "Hazel/vendor/imgui"]
+	path = Hazel/vendor/imgui
+	url = https://github.com/ocornut/imgui.git
+	branch = docking
+[submodule "Hazel/vendor/glm"]
+	path = Hazel/vendor/glm
+	url = https://github.com/g-truc/glm.git

Hazel/CMakeLists.txt

@@ -1,12 +1,23 @@
 set(PROJECT_NAME Hazel)
 project(${PROJECT_NAME})
 
-file(GLOB_RECURSE SOURCES "src/*.cpp")
-
-add_library(Hazel SHARED ${SOURCES})
-
 
 add_subdirectory(vendor/spdlog)
+add_subdirectory(vendor/GLAD)
+add_subdirectory(vendor/glm)
+
+file(GLOB_RECURSE SOURCES "src/*.cpp")
+
+include_directories(vendor/imgui)
+include_directories(vendor/imgui/backends)
+
+file(GLOB IMGUI vendor/imgui/**.cpp
+                vendor/imgui/backends/imgui_impl_opengl3.cpp
+                vendor/imgui/backends/imgui_impl_sdl3.cpp)
+
+add_library(Hazel SHARED ${SOURCES} ${IMGUI})
+
+
 
 
 set(BUILD_SHARED_LIBS ON CACHE BOOL "Build shared libraries" FORCE)
@@ -17,15 +28,23 @@ set(SDL3_SHARED ON CACHE BOOL "Build SDL as shared library" FORCE)
 target_include_directories(${PROJECT_NAME}
         PUBLIC
         ${CMAKE_CURRENT_SOURCE_DIR}/src  # 暴露头文件给其他项目
+        vendor/imgui
+        vendor/imgui/backends
 )
 
 
-target_link_libraries(${PROJECT_NAME} PUBLIC spdlog::spdlog SDL3::SDL3)
+target_link_libraries(${PROJECT_NAME} PUBLIC
+        spdlog::spdlog
+        SDL3::SDL3
+        glad
+        opengl32
+        glm::glm
+)
 
 target_compile_definitions(${PROJECT_NAME} PRIVATE HZ_BUILD_DLL)# 编译DLL时定义
 
 if(WIN32)
-    target_compile_definitions(${PROJECT_NAME} PUBLIC HZ_PLATFORM_WINDOWS)# 编译DLL时定义
+    target_compile_definitions(${PROJECT_NAME} PUBLIC HZ_PLATFORM_WINDOWS IMGUI_API=__declspec\(dllexport\))# 编译DLL时定义
     set(CMAKE_SHARED_LIBRARY_PREFIX "")
 endif ()
 

Hazel/src/Hazel.h

@@ -1,9 +1,12 @@
 #pragma once
 
 // For use by Hazel Applications
+#include "Hazel/Core.h"
 #include "Hazel/Application.h"
 #include "Hazel/Log.h"
 #include "Hazel/Window.h"
+#include "Hazel/ImGui/ImGuiLayer.h"
+#include "Hazel/Renderer/GraphicsContext.h"
 
 
 // ------------------------   Entry Point   ------------------------

Hazel/src/Hazel/Application.cpp

@@ -1,15 +1,62 @@
+
 #include "Application.h"
 
+#include <imgui_impl_opengl3_loader.h>
 #include <SDL3/SDL.h>
+#include <SDL3/SDL_opengl_glext.h>
 
 #include "Log.h"
 
 namespace Hazel {
 
+	Application* Application::s_Instance = nullptr;
+
 	Application::Application()
 	{
+		if (s_Instance != nullptr)
+		{
+			HZ_CORE_ERROR("Application already exists!");
+		}
+		s_Instance = this;
+
 		m_Window = std::unique_ptr<Window>(Window::Create());
 		m_Window->SetEventCallback(std::bind(&Application::OnEvent, this, std::placeholders::_1));
+
+		m_imguiLayer = new ImGuiLayer();
+		PushOverlay(m_imguiLayer);
+
+
+		// Vertex Array
+		glGenVertexArrays(1, &m_VertexArray);
+		glBindVertexArray(m_VertexArray);
+
+		// Vertex Buffer
+		glGenBuffers(1, &m_VertexBuffer);
+		glBindBuffer(GL_ARRAY_BUFFER, m_VertexBuffer);
+
+		float vertices[3 * 3] = {
+			-0.5f, -0.5f, 0.0f,
+			 0.5f, -0.5f, 0.0f,
+			 0.0f,  0.5f, 0.0f,
+		};
+
+		glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+		glEnableVertexAttribArray(0);
+		glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+
+		// Index Buffer
+		glGenBuffers(1, &m_IndexBuffer);
+		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_IndexBuffer);
+
+		uint32_t indices[3] = { 0, 1, 2 };
+
+		glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+
+
+
+		// Shader
+
 	}
 
 	Application::~Application() = default;
@@ -17,6 +64,25 @@ namespace Hazel {
 	void Application::Run() {
 		while (m_Running)
 		{
+			glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
+			glClear(GL_COLOR_BUFFER_BIT);
+
+			glBindVertexArray(m_VertexArray);
+			glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_INT, 0);
+			for (Layer* layer : m_layerStack)
+			{
+				layer->OnUpdate();
+			}
+
+			m_imguiLayer->Begin();
+			for (Layer* layer : m_layerStack)
+			{
+				layer->OnImGuiRender();
+			}
+			m_imguiLayer->End();
+
+
+			// HZ_CORE_INFO("{}", Input::IsKeyPressed(HZ_KEY_0));
 
 			m_Window->OnUpdate();
 		}
@@ -24,16 +90,26 @@ namespace Hazel {
 
 	void Application::OnEvent(SDL_Event& e)
 	{
-		while (SDL_PollEvent(&e))
+
+		for (auto it = m_layerStack.end(); it != m_layerStack.begin();)
 		{
-			switch (e.type)
+			(*--it)->OnEvent(e);
-			{
+		}
-			case SDL_EVENT_QUIT:
+
-				m_Running = false;
+		if (e.type == SDL_EVENT_QUIT)
-				break;
+		{
-			default:
+			m_Running = false;
-				break;
-			}
 		}
 	}
+
+	void Application::PushLayer(Layer* layer)
+	{
+		m_layerStack.PushLayer(layer);
+	}
+
+	void Application::PushOverlay(Layer* layer)
+	{
+		m_layerStack.PushOverlay(layer);
+		layer->OnAttach();
+	}
 }

Hazel/src/Hazel/Application.h

@@ -3,6 +3,9 @@
 #include <Platform/Windows/WindowsWindow.h>
 
 #include "Core.h"
+#include "Layer.h"
+#include "LayerStack.h"
+#include "ImGui/ImGuiLayer.h"
 
 namespace Hazel {
 
@@ -15,13 +18,25 @@ namespace Hazel {
 		void Run();
 
 		void OnEvent(SDL_Event& e);
+		void PushLayer(Layer* layer);
+		void PushOverlay(Layer* layer);
+		inline Window& GetWindow() { return *m_Window; }
+		inline static Application& Get() { return *s_Instance; }
 
 	private:
 		std::unique_ptr<Hazel::Window> m_Window;
+		ImGuiLayer* m_imguiLayer;
 		bool m_Running = true;
+
+		LayerStack m_layerStack;
+
+		unsigned m_VertexArray, m_VertexBuffer, m_IndexBuffer;
+
+	private:
+		static Application* s_Instance;
 	};
 
-	// to be defined int CLIENT 
+	// to be defined int CLIENT
 	Application* CreateApplication();
 
 }

Hazel/src/Hazel/EntryPoint.h

@@ -8,21 +8,6 @@ extern Hazel::Application* Hazel::CreateApplication();
 int main(int argc, char* argv[]) {
 	Hazel::Log::init();
 
-    HZ_CORE_TRACE("hello");
-    HZ_CORE_DEBUG("hello");
-    HZ_CORE_INFO("hello");
-    HZ_CORE_WARN("hello");
-    HZ_CORE_ERROR("hello");
-    HZ_CORE_FATAL("hello");
-
-    HZ_CLIENT_TRACE("hello");
-    HZ_CLIENT_DEBUG("hello");
-    HZ_CLIENT_INFO("hello");
-    HZ_CLIENT_WARN("hello");
-    HZ_CLIENT_ERROR("hello");
-    HZ_CLIENT_FATAL("hello");
-
-
 	auto app = Hazel::CreateApplication();
 	app->Run();
 }

Hazel/src/Hazel/ImGui/ImGuiLayer.cpp

@@ -0,0 +1,95 @@
+//
+// Created by sfd on 25-4-19.
+//
+
+#include "ImGuiLayer.h"
+
+#include <imgui.h>
+#include <imgui_impl_opengl3.h>
+#include <imgui_impl_sdl3.h>
+#include <Hazel/Application.h>
+
+
+namespace Hazel
+{
+    ImGuiLayer::ImGuiLayer() : Layer("ImGuiLayer")
+    {
+    }
+
+    ImGuiLayer::~ImGuiLayer()
+    {
+    }
+
+    void ImGuiLayer::OnAttach()
+    {
+        IMGUI_CHECKVERSION();
+        ImGui::CreateContext();
+        ImGui::StyleColorsDark();
+
+        ImGuiIO& io = ImGui::GetIO();
+        io.ConfigFlags |= ImGuiBackendFlags_HasMouseCursors;
+        io.ConfigFlags |= ImGuiBackendFlags_HasSetMousePos;
+
+        io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable Keyboard Controls
+        io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;      // Enable Gamepad Controls
+        io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;         // IF using Docking Branch
+        io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;
+
+        Application& app = Application::Get();
+        auto window = static_cast<SDL_Window*>(app.GetWindow().GetNativeWindow());
+        auto GL_Context = static_cast<SDL_GLContext>(app.GetWindow().GetNativeGLContext());
+
+        ImGui_ImplSDL3_InitForOpenGL(window, GL_Context);
+        ImGui_ImplOpenGL3_Init("#version 460");
+
+        // ------
+
+    }
+
+    void ImGuiLayer::OnDetech()
+    {
+        ImGui_ImplOpenGL3_Shutdown();
+        ImGui_ImplSDL3_Shutdown();
+        ImGui::DestroyContext();
+    }
+
+
+
+
+    void ImGuiLayer::OnEvent(SDL_Event& e)
+    {
+        ImGui_ImplSDL3_ProcessEvent(&e);
+    }
+
+    void ImGuiLayer::OnImGuiRender()
+    {
+        ImGui::ShowDemoWindow();
+    }
+
+    void ImGuiLayer::Begin()
+    {
+        ImGui_ImplOpenGL3_NewFrame();
+        ImGui_ImplSDL3_NewFrame();
+        ImGui::NewFrame();
+
+    }
+
+    void ImGuiLayer::End()
+    {
+        ImGuiIO&     io  = ImGui::GetIO();
+        Application& app = Application::Get();
+        io.DisplaySize   = ImVec2((float)app.GetWindow().GetWidth(), (float)app.GetWindow().GetHeight());
+
+        ImGui::Render();
+        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
+
+        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
+        {
+            SDL_Window*   backup_current_window  = SDL_GL_GetCurrentWindow();
+            SDL_GLContext backup_current_context = SDL_GL_GetCurrentContext();
+            ImGui::UpdatePlatformWindows();
+            ImGui::RenderPlatformWindowsDefault();
+            SDL_GL_MakeCurrent(backup_current_window, backup_current_context);
+        }
+    }
+}

Hazel/src/Hazel/ImGui/ImGuiLayer.h

@@ -0,0 +1,32 @@
+//
+// Created by sfd on 25-4-19.
+//
+
+#ifndef IMGUILAYER_H
+#define IMGUILAYER_H
+#include <Hazel/Layer.h>
+
+
+namespace Hazel {
+    class HAZEL_API ImGuiLayer : public Layer
+    {
+        public:
+        ImGuiLayer();
+        ~ImGuiLayer();
+
+        void OnAttach() override;
+        void OnDetech() override;
+        void OnEvent(SDL_Event& e) override;
+        void OnImGuiRender() override;
+
+        void Begin();
+        void End();
+
+        private:
+        float m_Time = 0.0f;
+
+    };
+}
+
+
+#endif //IMGUILAYER_H

Hazel/src/Hazel/Layer.h

@@ -21,7 +21,8 @@ namespace Hazel {
         virtual void OnAttach() {}
         virtual void OnDetech() {}
         virtual void OnUpdate() {}
-        virtual void OnEvent(SDL_Event& event) {}
+        virtual void OnImGuiRender() {}
+        virtual void OnEvent(SDL_Event& e) {}
 
         inline const std::string& GetName() const { return m_DebugName; }
 

Hazel/src/Hazel/LayerStack.cpp

@@ -3,3 +3,50 @@
 //
 
 #include "LayerStack.h"
+
+namespace Hazel
+{
+    LayerStack::LayerStack()
+    {
+    }
+    LayerStack::~LayerStack()
+    {
+        for (Layer* layer : m_layers)
+        {
+            delete layer;
+        }
+    }
+
+    void LayerStack::PushLayer(Layer* layer)
+    {
+        m_layers.emplace(m_layers.begin() + m_LayerInsertIndex++, layer);
+    }
+
+    void LayerStack::PushOverlay(Layer* layer)
+    {
+        m_layers.emplace_back(layer);
+    }
+
+    void LayerStack::PopLayer(Layer* layer)
+    {
+        auto it = std::ranges::find(m_layers.begin(), m_layers.end(), layer);
+        if (it != m_layers.end())
+        {
+            m_layers.erase(it);
+            m_LayerInsertIndex--;
+        }
+
+    }
+
+    void LayerStack::PopOverlay(Layer* layer)
+    {
+        auto it = std::ranges::find(m_layers.begin(), m_layers.end(), layer);
+        if (it != m_layers.end())
+        {
+            m_layers.erase(it);
+        }
+
+    }
+
+
+}

Hazel/src/Hazel/LayerStack.h

@@ -12,25 +12,25 @@
 
 namespace Hazel
 {
-    // class HAZEL_API LayerStack
+    class HAZEL_API LayerStack
-    // {
+    {
-    // public:
+    public:
-    //     LayerStack();
+        LayerStack();
-    //     ~LayerStack();
+        ~LayerStack();
-    //
+
-    //     void PushLayer(Layer* layer);
+        void PushLayer(Layer* layer);
-    //     void PushOverlay(Layer* layer);
+        void PushOverlay(Layer* layer);
-    //     void PopLayer(Layer* layer);
+        void PopLayer(Layer* layer);
-    //     void PopOverlay(Layer* layer);
+        void PopOverlay(Layer* layer);
-    //
+
-    //     std::vector<Layer*>::iterator begin() {}
+        std::vector<Layer*>::iterator begin() {return m_layers.begin();}
-    //     std::vector<Layer*>::iterator end() {}
+        std::vector<Layer*>::iterator end() { return m_layers.end(); }
-    //
+
-    // private:
+    private:
-    //     std::vector<Layer*> m_layers;
+        std::vector<Layer*> m_layers;
-    //     std::vector<Layer*>::iterator m_LayerInsert;
+        unsigned int m_LayerInsertIndex = 0;
-    //
+
-    // };
+    };
 }
 
 

Hazel/src/Hazel/Renderer/GraphicsContext.h

@@ -0,0 +1,23 @@
+//
+// Created by sfd on 25-4-21.
+//
+
+#ifndef GRAPHICSCONTEXT_H
+#define GRAPHICSCONTEXT_H
+
+#include "Hazel/Core.h"
+
+namespace Hazel
+{
+    class HAZEL_API GraphicsContext
+    {
+    public:
+        virtual void Init() = 0;
+        virtual void SwapBuffers() = 0;
+
+        virtual void* GetGLContext() = 0;
+    };
+}
+
+
+#endif //GRAPHICSCONTEXT_H

Hazel/src/Hazel/Window.h

@@ -43,6 +43,10 @@ namespace Hazel
 
         static Window* Create(const WindowProps& props = WindowProps());
 
+        virtual void* GetNativeWindow() const = 0;
+        virtual void* GetNativeGLContext() const = 0;
+
+
     };
 
 }

Hazel/src/Platform/OpenGL/OpenGLContext.cpp

@@ -0,0 +1,44 @@
+//
+// Created by sfd on 25-4-21.
+//
+
+#include "OpenGLContext.h"
+
+#include <Hazel/Log.h>
+#include <SDL3/SDL_opengl.h>
+
+
+namespace Hazel
+{
+    OpenGLContext::OpenGLContext(SDL_Window* windowHandle) : m_windowHandle(windowHandle)
+    {
+    }
+
+    void OpenGLContext::Init()
+    {
+        m_GLContext = SDL_GL_CreateContext(m_windowHandle);
+        if (!m_GLContext)
+        {
+            HZ_CORE_ERROR("Could not create OpenGL context: {}", SDL_GetError());
+            exit(EXIT_FAILURE);
+        }
+
+        const GLubyte* vender = glGetString(GL_VENDOR);
+        const GLubyte* renderer = glGetString(GL_RENDERER);
+        const GLubyte* version = glGetString(GL_VERSION);
+		HZ_CORE_INFO("OpenGL info: ");
+		HZ_CORE_INFO("  Vender: {0}", reinterpret_cast<const char*>(vender));
+		HZ_CORE_INFO("  Renderer: {0}", reinterpret_cast<const char*>(renderer));
+        HZ_CORE_INFO("  Version: {0}", reinterpret_cast<const char*>(version));
+    }
+
+    void OpenGLContext::SwapBuffers()
+    {
+        SDL_GL_SwapWindow(m_windowHandle);
+    }
+
+    void* OpenGLContext::GetGLContext()
+    {
+        return m_GLContext;
+    }
+}

Hazel/src/Platform/OpenGL/OpenGLContext.h

@@ -0,0 +1,30 @@
+//
+// Created by sfd on 25-4-21.
+//
+
+#ifndef OPENGLCONTEXT_H
+#define OPENGLCONTEXT_H
+
+#include <Hazel/Renderer/GraphicsContext.h>
+#include <SDL3/SDL_video.h>
+
+struct SDL_Window;
+
+namespace Hazel
+{
+    class OpenGLContext : public GraphicsContext
+    {
+    public:
+        OpenGLContext(SDL_Window* windowHandle);
+
+        void Init() override;
+        void SwapBuffers() override;
+        void *GetGLContext() override;
+
+    private:
+        SDL_Window* m_windowHandle;
+        SDL_GLContext m_GLContext;
+    };
+}
+
+#endif //OPENGLCONTEXT_H

Hazel/src/Platform/Windows/WindowsWindow.cpp

@@ -4,7 +4,10 @@
 
 #include "WindowsWindow.h"
 
+#include <iostream>
 #include <Hazel/Log.h>
+#include <Platform/OpenGL/OpenGLContext.h>
+#include <glad/glad.h>
 
 
 namespace Hazel
@@ -46,23 +49,33 @@ namespace Hazel
             s_SDLInitialized = true;
         }
 
-        m_Window = SDL_CreateWindow(m_Data.title.c_str(), props.width, props.height, 0);
+        m_Window = SDL_CreateWindow(m_Data.title.c_str(), props.width, props.height, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
-
+        if (!m_Window)
-        HZ_CORE_INFO("Creating Renderer...");
-        m_Renderer = SDL_CreateRenderer(m_Window, nullptr);
-        if (m_Renderer == nullptr)
         {
-            HZ_CORE_ERROR("Could not create renderer: {}", SDL_GetError());
+            HZ_CORE_ERROR("Could not create window: {}", SDL_GetError());
             exit(EXIT_FAILURE);
         }
 
+        m_Context = new OpenGLContext(m_Window);
+        m_Context->Init();
+
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 6);
+        SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
+
+
+        HZ_CORE_INFO("Initing GLAD...");
+        if (!gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress))
+        {
+            HZ_CORE_ERROR("Could not initialize GLAD context!");
+        }
+
 
         SetVSync(true);
     }
 
     void WindowsWindow::Shutdown()
     {
-        SDL_DestroyRenderer(m_Renderer);
         SDL_DestroyWindow(m_Window);
         SDL_Quit();
     }
@@ -70,22 +83,16 @@ namespace Hazel
     void WindowsWindow::OnUpdate()
     {
         SDL_Event event;
-        if (m_Data.eventCallback != nullptr)
-        {
-            m_Data.eventCallback(event);
-        }
 
         while (SDL_PollEvent(&event))
         {
-            if (event.type == SDL_EVENT_QUIT)
+            if (m_Data.eventCallback != nullptr)
             {
-                //TODO: quit this window
+                m_Data.eventCallback(event);
             }
         }
 
-        SDL_SetRenderDrawColor(m_Renderer, 0, 0, 0, 0xFF);
+        m_Context->SwapBuffers();
-        SDL_RenderClear(m_Renderer);
-        SDL_RenderPresent(m_Renderer);
     }
 
     void WindowsWindow::SetVSync(bool enabled)
@@ -106,5 +113,4 @@ namespace Hazel
     {
         return m_Data.vSync;
     }
-
 }

Hazel/src/Platform/Windows/WindowsWindow.h

@@ -5,12 +5,16 @@
 #ifndef WINDOWSWINDOW_H
 #define WINDOWSWINDOW_H
 
+#include <Hazel/Renderer/GraphicsContext.h>
+
 #include "Hazel/Window.h"
 
 #include <SDL3/SDL.h>
 
 namespace Hazel
 {
+    class GraphicsContext;
+
     class WindowsWindow : public Window
     {
     public:
@@ -28,13 +32,16 @@ namespace Hazel
         void        SetVSync(bool enabled) override;
         bool        IsVSync() const override;
 
+        void* GetNativeWindow() const override {return m_Window;}
+        void* GetNativeGLContext() const override {return m_Context->GetGLContext();}
+
     private:
         virtual void Init(const WindowProps& props);
         virtual void Shutdown();
 
     private:
-        SDL_Window* m_Window;
+        SDL_Window*   m_Window;
-        SDL_Renderer* m_Renderer;
+		GraphicsContext* m_Context;
 
         struct WindowData
         {

Hazel/vendor/GLAD/CMakeLists.txt

@@ -0,0 +1,5 @@
+project(glad)
+
+add_library(glad STATIC src/glad.c)
+
+target_include_directories(glad PUBLIC include)

Hazel/vendor/GLAD/include/KHR/khrplatform.h

@@ -0,0 +1,311 @@
+#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
+/*
+ * To support platform where unsigned long cannot be used interchangeably with
+ * inptr_t (e.g. CHERI-extended ISAs), we can use the stdint.h intptr_t.
+ * Ideally, we could just use (u)intptr_t everywhere, but this could result in
+ * ABI breakage if khronos_uintptr_t is changed from unsigned long to
+ * unsigned long long or similar (this results in different C++ name mangling).
+ * To avoid changes for existing platforms, we restrict usage of intptr_t to
+ * platforms where the size of a pointer is larger than the size of long.
+ */
+#if defined(__SIZEOF_LONG__) && defined(__SIZEOF_POINTER__)
+#if __SIZEOF_POINTER__ > __SIZEOF_LONG__
+#define KHRONOS_USE_INTPTR_T
+#endif
+#endif
+
+#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 KHRONOS_USE_INTPTR_T
+typedef intptr_t               khronos_intptr_t;
+typedef uintptr_t              khronos_uintptr_t;
+#elif defined(_WIN64)
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+#endif
+
+#if defined(_WIN64)
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+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_ */

Sandbox/CMakeLists.txt

@@ -1,9 +1,9 @@
 set(PROJECT_NAME "Sandbox")
 project(${PROJECT_NAME})
 
-
 file(GLOB_RECURSE SOURCES "src/*.cpp")
 
 add_executable(${PROJECT_NAME} ${SOURCES})
 
 target_link_libraries(${PROJECT_NAME} PRIVATE Hazel)
+

Sandbox/src/SandboxApp.cpp

@@ -1,17 +1,55 @@
 #include <Hazel.h>
 
+#include "imgui.h"
+#include "imgui_impl_sdl2.h"
+#include "imgui_impl_opengl3.h"
+
+
+class ExampleLayer : public Hazel::Layer
+{
+public:
+	ExampleLayer() : Layer("ExampleLayer")
+	{
+	}
+
+	void OnUpdate() override
+	{
+	}
+
+	void OnEvent(SDL_Event& event) override
+	{
+		if (event.type == SDL_EVENT_KEY_DOWN)
+		{
+			HZ_CORE_TRACE("{}", event.key.key);
+		}
+	}
+
+	void OnImGuiRender() override
+	{
+		ImGui::Begin("Hazel Layer");
+		ImGui::Text("Hello World");
+		ImGui::End();
+
+
+
+	}
+
+};
+
 
 class Sandbox : public Hazel::Application
 {
 public:
-	Sandbox();
+	Sandbox()
+	{
+		PushLayer(new ExampleLayer());
+	}
 	~Sandbox();
 
 private:
 
 };
 
-Sandbox::Sandbox() = default;
 
 Sandbox::~Sandbox() = default;