import std.stdio;
import derelict.sdl.sdl;
import derelict.opengl.gl;
import derelict.opengl.glu;

enum int WIDTH = 800;
enum int HEIGHT = 600;

void init()
{
    glClearColor (0.0, 0.0, 0.0, 0.0);
    glShadeModel(GL_SMOOTH);
    glViewport(0, 0, WIDTH, HEIGHT);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0, cast(GLfloat)WIDTH/cast(GLfloat)WIDTH, 1.0, 30.0);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glTranslatef(0.0, 0.0, -10.0);
}

void display()
{
    glClear(GL_COLOR_BUFFER_BIT);
    glBegin(GL_QUADS);
        glColor3f(1, 1, 1);
        glVertex3f(5.0, 5.0, 0.0);
        glColor3f(1, 0, 0);
        glVertex3f(-5.0, 5.0, 0.0);
        glColor3f(0, 0, 1);
        glVertex3f(-5.0, -5.0, 0.0);
        glColor3f(0, 1, 0);
        glVertex3f(5.0, -5.0, 0.0);
    glEnd();
    SDL_GL_SwapBuffers();
}

int main(char[][] args)
{
    DerelictSDL.load();
    DerelictGL.load();
    DerelictGLU.load();

    if (SDL_Init(SDL_INIT_EVERYTHING))
    {
        writefln("Failed to initialize SDL!");
        return 1;
    }

    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

    SDL_Surface *screen = SDL_SetVideoMode(WIDTH, HEIGHT, 32, SDL_OPENGL);
    if (screen == null)
    {
        printf("Failed to set video mode!\n");
        SDL_Quit();
        return 2;
    }

    init();
    display();
    SDL_Event event;
    while (SDL_WaitEvent(&event))
    {
        if (event.type == SDL_QUIT)
            break;
        else if (event.type == SDL_KEYDOWN)
        {
            if (event.key.keysym.sym == SDLK_ESCAPE)
                break;
        }
    }

    SDL_Quit();

    return 0;
}