#include <stdio.h>
#include <mgl/mgl.h>
#include <mgl/window.h>
#include <mgl/graphics/texture.h>

#include <GL/gl.h>
#include <GL/glu.h>

typedef struct {
    mgl_texture *texture;
} Userdata;

static void draw(mgl_window *window, void *userdata) {
    Userdata *u = userdata;

    glBegin(GL_QUADS);
        glColor3f(1., 0., 0.); glVertex3f(-.75, -.75, 0.);
        glColor3f(0., 1., 0.); glVertex3f( .75, -.75, 0.);
        glColor3f(0., 0., 1.); glVertex3f( .75,  .75, 0.);
        glColor3f(1., 1., 0.); glVertex3f(-.75,  .75, 0.);
    glEnd();

    glBegin(GL_QUADS);
        glColor4f(1., 0., 0., 0.5); glVertex3f(0.1 + -.75, 0.1 + -.75, 0.);
        glColor4f(1., 0., 0., 0.5); glVertex3f(0.1 +  .75, 0.1 + -.75, 0.);
        glColor4f(1., 0., 0., 0.5); glVertex3f(0.1 +  .75, 0.1 +  .75, 0.);
        glColor4f(1., 0., 0., 0.5); glVertex3f(0.1 + -.75, 0.1 +  .75, 0.);
    glEnd();

    glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
    glBindTexture(GL_TEXTURE_2D, u->texture->id);
    glBegin(GL_QUADS);
        glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f,        -1.0f,        0.0f);
        glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f + 0.1f, -1.0f,        0.0f);
        glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f + 0.1f, -1.0f + 0.1f, 0.0f);
        glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f,        -1.0f + 0.1f, 0.0f);
    glEnd();
    glBindTexture(GL_TEXTURE_2D, 0);
}

int main(int argc, char **argv) {
    if(mgl_init() != 0)
        return 1;

    mgl_texture texture;
    mgl_window_callback window_callback;
    window_callback.draw = draw;

    Userdata userdata;
    userdata.texture = &texture;

    mgl_window window;
    if(mgl_window_create(&window, "mgl", 1280, 720, &window_callback, &userdata) != 0)
        return 1;

    if(mgl_texture_load_from_file(&texture, "X11.png") != 0)
        return 1;

    for(;;) {
        mgl_window_events_poll(&window);
        mgl_window_draw(&window);
    }

    mgl_texture_unload(&texture);
    mgl_window_deinit(&window);
    mgl_deinit();
    return 0;
}