main.cpp

 #include "core.h"
#include "GUI.h"

// Main code
int main(int, char**)
{
    // Setup SDL
    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMECONTROLLER) != 0)
    {
        printf("Error: %s\n", SDL_GetError());
        return -1;
    }

    // Decide GL+GLSL versions
#if defined(IMGUI_IMPL_OPENGL_ES2)
    // GL ES 2.0 + GLSL 100
    const char* glsl_version = "#version 100";
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
#elif defined(__APPLE__)
    // GL 3.2 Core + GLSL 150
    const char* glsl_version = "#version 150";
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, SDL_GL_CONTEXT_FORWARD_COMPATIBLE_FLAG); // Always required on Mac
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
#else
    // GL 3.0 + GLSL 130
    const char* glsl_version = "#version 130";
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_FLAGS, 0);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
#endif

    // From 2.0.18: Enable native IME.
#ifdef SDL_HINT_IME_SHOW_UI
    SDL_SetHint(SDL_HINT_IME_SHOW_UI, "1");
#endif

    // Create window with graphics context
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
    SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
    auto window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_ALLOW_HIGHDPI);
    SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL2+OpenGL3 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
    SDL_GLContext gl_context = SDL_GL_CreateContext(window);
    SDL_GL_MakeCurrent(window, gl_context);
    SDL_GL_SetSwapInterval(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_DockingEnable;           // Enable Docking
    io.ConfigFlags |= ImGuiConfigFlags_ViewportsEnable;         // Enable Multi-Viewport / Platform Windows


    // Setup Dear ImGui style
    ImGui::StyleColorsDark();
    ImGuiStyle& style = ImGui::GetStyle();

    if (io.ConfigFlags & ImGuiConfigFlags_ViewportsEnable)
    {
        style.WindowRounding = 10.0f;
        style.Colors[ImGuiCol_WindowBg].w = 2.0f;
    }


     style.WindowPadding = ImVec2(10, 10);
     style.FramePadding = ImVec2(5, 5);
     style.ItemSpacing = ImVec2(5, 5);
     style.ItemInnerSpacing = ImVec2(2, 2);
     style.Alpha = 1.0f;
     style.FrameRounding = 5.0f;
     style.WindowRounding = 5.0f;
     style.IndentSpacing = 20.0f;
     style.ScrollbarSize = 15.0f;
     style.ScrollbarRounding = 9.0f;
     style.GrabMinSize = 5.0f;
     style.GrabRounding = 3.0f;
     // Customize the style
     ImVec4 lightGreen = ImVec4(0.7f, 0.9f, 0.7f, 1.0f);
     ImVec4 darkGreen = ImVec4(0.4f, 0.6f, 0.4f, 1.0f);
     ImVec4 backgroundColor = ImVec4(0.15f, 0.15f, 0.15f, 1.0f);


     /*style.Colors[ImGuiCol_Text] = darkGreen;
     style.Colors[ImGuiCol_WindowBg] = backgroundColor;
     style.Colors[ImGuiCol_TitleBg] = lightGreen;
     style.Colors[ImGuiCol_TitleBgActive] = lightGreen;
     style.Colors[ImGuiCol_Button] = lightGreen;
     //style.Colors[ImGuiCol_ButtonHovered] = ImVec4(lightGreen.x + 0.1f, lightGreen.y + 0.1f, lightGreen.z + 0.1f, lightGreen.w);
     //style.Colors[ImGuiCol_ButtonActive] = ImVec4(lightGreen.x - 0.1f, lightGreen.y - 0.1f, lightGreen.z - 0.1f, lightGreen.w);
*/




     // Setup Platform/Renderer backends
    ImGui_ImplSDL2_InitForOpenGL(window, gl_context);
    ImGui_ImplOpenGL3_Init(glsl_version);

//----------------------------------------------------------------------------------SETUP
    //bool show_demo_window = true;
    //bool show_another_window = false;
    Scene2DManager manager;
    manager.create_scene("test");
    ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
    GUI gui(&manager);
    UI_State state = UI_State::MAIN_MENU;


//----------------------------------------------------------------------------------END SETUP
    // Main loop
    bool done = false;
    while (!done)

    {
        // Poll and handle events (inputs, window set_size, etc.)
        SDL_Event event;
        while (SDL_PollEvent(&event))
        {
            ImGui_ImplSDL2_ProcessEvent(&event);
            if (event.type == SDL_QUIT)
                done = true;
            if (event.type == SDL_WINDOWEVENT && event.window.event == SDL_WINDOWEVENT_CLOSE && event.window.windowID == SDL_GetWindowID(window))
                done = true;
        }

        // Start the Dear ImGui frame
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplSDL2_NewFrame();
        ImGui::NewFrame();
        ImGui::DockSpaceOverViewport(ImGui::GetMainViewport());

//----------------------------------------------------------------------------------BEGINNING OF PROGRAM SPECIFIC CODE

        switch (state){
            case UI_State::MAIN_MENU:
                gui.main_menu(&state);
                break;
            case UI_State::EDITOR:
                gui.editor(&done);
                break;
            case UI_State::PLAY:
                gui.play(&done);
                break;

        }


        gui.start(&done);
        manager.update();

//----------------------------------------------------------------------------------END OF PROGRAM SPECIFIC CODE
        // Rendering
        ImGui::Render();
        glViewport(0, 0, (int)io.DisplaySize.x, (int)io.DisplaySize.y);
        glClearColor(clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w);
        glClear(GL_COLOR_BUFFER_BIT);
        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);
        }

        SDL_GL_SwapWindow(window);
    }


    // Cleanup
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplSDL2_Shutdown();
    ImGui::DestroyContext();

    SDL_GL_DeleteContext(gl_context);
    SDL_DestroyWindow(window);
    SDL_Quit();

    return 0;
}