imgui-docking/examples/allegro5_example/main.cpp

// ImGui - standalone example application for Allegro 5

#include <stdint.h>
#include <allegro5/allegro.h>
#include <allegro5/allegro_primitives.h>
#include <imgui.h>
#include "imgui_impl_a5.h"

int main(int, char**)
{
    // Setup Allegro 
    al_init();
    al_install_keyboard();
    al_install_mouse();
    al_init_primitives_addon();
    al_set_new_display_flags(ALLEGRO_RESIZABLE);
    ALLEGRO_DISPLAY* display = al_create_display(1280, 720);
    al_set_window_title(display, "ImGui Allegro 5 example");
    ALLEGRO_EVENT_QUEUE* queue = al_create_event_queue();
    al_register_event_source(queue, al_get_display_event_source(display));
    al_register_event_source(queue, al_get_keyboard_event_source());
    al_register_event_source(queue, al_get_mouse_event_source());

    // Setup ImGui binding
    ImGui_ImplA5_Init(display);

    // Load Fonts
    // (see extra_fonts/README.txt for more details)
    //ImGuiIO& io = ImGui::GetIO();
    //io.Fonts->AddFontDefault();
    //io.Fonts->AddFontFromFileTTF("../../extra_fonts/DroidSans.ttf", 16.0f);
    //io.Fonts->AddFontFromFileTTF("../../extra_fonts/ProggyClean.ttf", 13.0f);
    //io.Fonts->AddFontFromFileTTF("../../extra_fonts/ProggyTiny.ttf", 10.0f);
    //io.Fonts->AddFontFromFileTTF("c:\\Windows\\Fonts\\ArialUni.ttf", 18.0f, NULL, io.Fonts->GetGlyphRangesJapanese());

    // Merge glyphs from multiple fonts into one (e.g. combine default font with another with Chinese glyphs, or add icons)
    //ImWchar icons_ranges[] = { 0xf000, 0xf3ff, 0 };
    //ImFontConfig icons_config; icons_config.MergeMode = true; icons_config.PixelSnapH = true;
    //io.Fonts->AddFontFromFileTTF("../../extra_fonts/DroidSans.ttf", 18.0f);
    //io.Fonts->AddFontFromFileTTF("../../extra_fonts/fontawesome-webfont.ttf", 18.0f, &icons_config, icons_ranges);

    bool show_test_window = true;
    bool show_another_window = false;
    ImVec4 clear_color = ImColor(114, 144, 154);

    // Main loop
    bool running = true;
    while (running) 
    {
        ALLEGRO_EVENT ev;
        while (al_get_next_event(queue, &ev))
        {
            ImGui_ImplA5_ProcessEvent(&ev);
            if (ev.type == ALLEGRO_EVENT_DISPLAY_CLOSE) running = false;
            if (ev.type == ALLEGRO_EVENT_DISPLAY_RESIZE)
            {
                ImGui_ImplA5_InvalidateDeviceObjects();
                al_acknowledge_resize(display);
                Imgui_ImplA5_CreateDeviceObjects();
            }
        }
        ImGui_ImplA5_NewFrame();

        // 1. Show a simple window
        // Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets appears in a window automatically called "Debug"
        {
            static float f;
            ImGui::Text("Hello, world!");
            ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
            ImGui::ColorEdit3("clear color", (float*)&clear_color);
            if (ImGui::Button("Test Window")) show_test_window ^= 1;
            if (ImGui::Button("Another Window")) show_another_window ^= 1;
            ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f/ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
        }

        // 2. Show another simple window, this time using an explicit Begin/End pair
        if (show_another_window) 
        {
            ImGui::SetNextWindowSize(ImVec2(200, 100), ImGuiSetCond_FirstUseEver);
            ImGui::Begin("Another Window", &show_another_window);
            ImGui::Text("Hello");
            ImGui::End();
        }

        // 3. Show the ImGui test window. Most of the sample code is in ImGui::ShowTestWindow()
        if (show_test_window) 
        {
            ImGui::SetNextWindowPos(ImVec2(650, 20), ImGuiSetCond_FirstUseEver);
            ImGui::ShowTestWindow(&show_test_window);
        }

        // Rendering
        al_clear_to_color(al_map_rgba_f(clear_color.x, clear_color.y, clear_color.z, clear_color.w));
        ImGui::Render();
        al_flip_display();
    }

    // Cleanup
    ImGui_ImplA5_Shutdown();
    al_destroy_event_queue(queue);
    al_destroy_display(display);

    return 0;
}