#include <stdio.h>

#include <GL/gl3w.h>
#include <GLFW/glfw3.h>
#include "imgui\imgui.h"
#include "imgui\imgui_impl_glfw.h"
#include "imgui\imgui_impl_opengl3.h"


int main() {

    //------------------------------
    // 初期設定
    //------------------------------

    if (!glfwInit()) {
        return -1;
    }

    const char* glsl_version = "#version 130";
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);

    GLFWwindow* window = glfwCreateWindow(640, 480, "test", NULL, NULL);

    if (!window) {
        glfwTerminate();
        return -1;
    }

    glfwMakeContextCurrent(window);
    glfwSwapInterval(1);
    gl3wInit();


    // Setup Dear ImGui context
    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    ImGuiIO& io = ImGui::GetIO(); (void)io;


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

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


    //-----------------------------------------------
    // 3D処理
    //-----------------------------------------------

    float x = 0.f, y= 0.f;


    while (!glfwWindowShouldClose(window)) {


        glfwPollEvents();

        // Start the Dear ImGui frame
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();


        ImGui::Begin("Hello, world!");

        ImGui::Text("This is some useful text.");
        ImGui::DragFloat("x", &x);
        ImGui::DragFloat("y", &y);

        ImGui::End();

         // Rendering
        ImGui::Render();
        int display_w, display_h;
        glfwGetFramebufferSize(window, &display_w, &display_h);
        glClearColor(0.8f, 0.8f, 0.8f, 0.0f);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
        glViewport(0, 0, display_w, display_h);



        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());


        glfwSwapBuffers(window);
    }

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

    glfwDestroyWindow(window);
    glfwTerminate();
    return 0;
}