pixelarium/src/AppGLFW.cpp

#include "AppGLFW.hpp"

#include "portable-file-dialogs.h"

ui::AppGLFW::AppGLFW()
{
    glfwSetErrorCallback(glfw_error_callback);
    if (!glfwInit())
    {
        return;
    }

    // Decide GL+GLSL versions
#if defined(IMGUI_IMPL_OPENGL_ES2)
    // GL ES 2.0 + GLSL 100
    const char* glsl_version = "#version 100";
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
    glfwWindowHint(GLFW_CLIENT_API, GLFW_OPENGL_ES_API);
#elif defined(__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
#ifdef __linux__
    const char* glsl_version = "#version 130";
#else
    const char* glsl_version = reinterpret_cast<const char*>("#version 130");
#endif
    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

    // int count;
    // GLFWmonitor** monitors = glfwGetMonitors(&count); // at [0] is always the
    // main monitor GLFWmonitor* monitor = monitors[1];
    GLFWmonitor* monitor = glfwGetPrimaryMonitor();
    int xpos, ypos, width, height;
    glfwGetMonitorWorkarea(monitor, &xpos, &ypos, &width, &height);

    // lg::Logger::Info("screen width " + std::to_string(width) +
    //                  " screen heigth " + std::to_string(height));

    // Create window with graphics context
    window = glfwCreateWindow(1200, 800, "pixelarium", nullptr, nullptr);
    if (window == nullptr)
    {
        // lg::Logger::Error("no window");
        return;
    }

    glfwMakeContextCurrent(window);
    glfwSwapInterval(1);  // Enable vsync

    // Setup Dear ImGui context
    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    ImGuiIO& io = ImGui::GetIO();
    (void)io;
    io.ConfigFlags |=
        ImGuiConfigFlags_NavEnableKeyboard;  // Enable Keyboard Controls
    io.ConfigFlags |=
        ImGuiConfigFlags_NavEnableGamepad;  // Enable Gamepad Controls
    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;  // Enable Docking
    io.ConfigFlags |=
        ImGuiConfigFlags_ViewportsEnable;  // Enable Multi-Viewport / Platform
                                           // Windows
    // io.ConfigViewportsNoAutoMerge = true;
    // io.ConfigViewportsNoTaskBarIcon = true;

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

    ImGuiStyle& style = ImGui::GetStyle();

    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
    {
        style.WindowRounding = 0.0f;
        style.Colors[ImGuiCol_WindowBg].w = 1.0f;
    }

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

int ui::AppGLFW::Run()
{
    ImGuiIO& io = ImGui::GetIO();
    (void)io;
    while (!glfwWindowShouldClose(this->window))
    {
        glfwPollEvents();

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

        // Rendering
        ImGui::Render();
        int display_w, display_h;
        glfwGetFramebufferSize(this->window, &display_w, &display_h);
        glViewport(0, 0, display_w, display_h);
        glClear(GL_COLOR_BUFFER_BIT);
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());

        if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
        {
            GLFWwindow* backup_current_context = glfwGetCurrentContext();
            ImGui::UpdatePlatformWindows();
            ImGui::RenderPlatformWindowsDefault();
            glfwMakeContextCurrent(backup_current_context);
        }

        glfwSwapBuffers(this->window);
    }
    // Cleanup
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();

    glfwDestroyWindow(this->window);
    glfwTerminate();

    return 0;
}