import std.stdio;
import std.c.time;

import derelict.opengl3.gl3;
import derelict.sdl2.sdl;

void main () {
    DerelictGL3.load();
    DerelictSDL2.load();

    SDL_Window* mainwindow;
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
    writeln("SDL_Init failed");
    }

    mainwindow = SDL_CreateWindow("SDL OpenGL test",
                  SDL_WINDOWPOS_CENTERED,
                  SDL_WINDOWPOS_CENTERED,
                  512, 512,
                  SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN);
    if (!mainwindow)
        writeln("Unable to create window");

    SDL_GLContext maincontext;
    maincontext = SDL_GL_CreateContext(mainwindow);

    SDL_GL_SetSwapInterval(1);

    bool quit_triggered = false;
    while (!quit_triggered) {
    glClearColor (0.0, 0.6, 0.8, 1.0);
    glClear (GL_COLOR_BUFFER_BIT);
    SDL_GL_SwapWindow(mainwindow);

    SDL_PumpEvents();
    ubyte *state = SDL_GetKeyboardState(null);
    if (state[SDL_SCANCODE_ESCAPE]) {
        quit_triggered = true;
    }
    }

    SDL_GL_DeleteContext(maincontext);
    SDL_DestroyWindow(mainwindow);
    SDL_Quit();

    return;
}