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ImGUI

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find_package(OpenGL)

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FetchContent_Declare(glad GIT_REPOSITORY https://github.com/Dav1dde/glad.git GIT_TAG df8e9e16110b305479a875399cee13daa0ccadd9)
FetchContent_MakeAvailable(glad)

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set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
set(GLFW_INSTALL OFF CACHE BOOL "" FORCE)
FetchContent_Declare(glfw GIT_REPOSITORY https://github.com/glfw/glfw.git GIT_TAG 3.3.2)
FetchContent_MakeAvailable(glfw)

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FetchContent_Declare(
        imgui
        GIT_REPOSITORY https://github.com/ocornut/imgui.git
        GIT_TAG v1.77
)
FetchContent_GetProperties(imgui)
if (NOT imgui_POPULATED)
    FetchContent_Populate(imgui)
    set(IMGUI_INCLUDE_DIR ${imgui_SOURCE_DIR}/)
    file(GLOB IMGUI_SOURCES ${imgui_SOURCE_DIR}/*.cpp)
    file(GLOB IMGUI_HEADERS ${imgui_SOURCE_DIR}/*.h)
    add_library(imgui STATIC ${IMGUI_SOURCES} ${IMGUI_SOURCES} ${imgui_SOURCE_DIR}/examples/imgui_impl_glfw.cpp ${imgui_SOURCE_DIR}/examples/imgui_impl_opengl3.cpp)
    add_definitions(-DIMGUI_IMPL_OPENGL_LOADER_GLAD)

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    target_include_directories(imgui PUBLIC ${IMGUI_INCLUDE_DIR} ${OPENGL_INCLUDE_DIR} ${GLFW_INCLUDE_DIR} ${GLAD_INCLUDE_DIR})
    target_link_libraries(imgui ${OPENGL_LIBRARIES} glfw glad)
endif ()

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#include "imgui.h"

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#include "examples/imgui_impl_glfw.h"
#include "examples/imgui_impl_opengl3.h"

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#if defined(IMGUI_IMPL_OPENGL_LOADER_GL3W)
#include <GL/gl3w.h> // Initialize with gl3wInit()
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLEW)
#include <GL/glew.h> // Initialize with glewInit()
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLAD)
#include <glad/glad.h> // Initialize with gladLoadGL()
#elif defined(IMGUI_IMPL_OPENGL_LOADER_GLBINDING2)
#define GLFW_INCLUDE_NONE // GLFW including OpenGL headers causes ambiguity or
                          // multiple definition errors.
#include <glbinding/Binding.h> // Initialize with glbinding::Binding::initialize()
#include <glbinding/gl/gl.h>

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    glfwSetErrorCallback(glfw_error_callback);
    if (!glfwInit())
        return 1;

        // Decide GL+GLSL versions
#if __APPLE__
    // GL 3.2 + GLSL 150
    const char *glsl_version = "#version 150";
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE); // 3.2+ only
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // Required on Mac
#else
    // GL 3.0 + GLSL 130
    const char *glsl_version = "#version 130";
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
    // glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);  // 3.2+
    // only glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE); // 3.0+ only
#endif

    // Create window with graphics context
    GLFWwindow *window = glfwCreateWindow(
        1280, 720, "Dear ImGui GLFW+OpenGL3 example", NULL, NULL);
    if (window == NULL)
        return 1;
    glfwMakeContextCurrent(window);
    glfwSwapInterval(1); // Enable vsync

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IMGUI_CHECKVERSION();
ImGui::CreateContext();
ImGuiIO &io = ImGui::GetIO();
(void)io;
// io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;     // Enable
// Keyboard Controls io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad; //
// Enable Gamepad Controls

// Setup Dear ImGui style
ImGui::StyleColorsDark();
// ImGui::StyleColorsClassic();

// Setup Platform/Renderer bindings
ImGui_ImplGlfw_InitForOpenGL(window, true);
ImGui_ImplOpenGL3_Init(glsl_version);

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ImGui_ImplOpenGL3_NewFrame();
ImGui_ImplGlfw_NewFrame();
ImGui::NewFrame();

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if (show_demo_window)
    ImGui::ShowDemoWindow(&show_demo_window);

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ImGui::Render();
int display_w, display_h;
glfwGetFramebufferSize(window, &display_w, &display_h);
glViewport(0, 0, display_w, display_h);
glClearColor(clear_color.x, clear_color.y, clear_color.z,
             clear_color.w);
glClear(GL_COLOR_BUFFER_BIT);
ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

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ImGui_ImplOpenGL3_Shutdown();
ImGui_ImplGlfw_Shutdown();
ImGui::DestroyContext();

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