#include "SDL.h"
#include "SDL_opengl.h"

#include <string.h>

#define WIDTH (768)
#define HEIGHT WIDTH

unsigned char pixels[WIDTH * HEIGHT * 4];

int main(void)
{
    GLuint textureID;
    int i, j;

    SDL_Init(SDL_INIT_VIDEO);

    SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);

    SDL_SetVideoMode(640, 480, 24, SDL_OPENGL);

    memset(pixels, 0xFF, sizeof(pixels));

    glGenTextures(1, &textureID);
    glBindTexture(GL_TEXTURE_2D, textureID);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_COMPRESSED_RGB_S3TC_DXT1_EXT, WIDTH, HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
    // glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, WIDTH, HEIGHT, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
    glGenerateMipmap(GL_TEXTURE_2D);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
    // glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    glClear(GL_COLOR_BUFFER_BIT);
    glEnable(GL_TEXTURE_2D);
    glBindTexture(GL_TEXTURE_2D, textureID);

    glBegin(GL_QUADS);
        glTexCoord2f(0.f, 0.f);
        glVertex2f(-1.f, -1.f);

        glTexCoord2f(1.f, 0.f);
        glVertex2f(1.f, -1.f);

        glTexCoord2f(1.f, 1.f);
        glVertex2f(1.f, 1.f);

        glTexCoord2f(0.f, 1.f);
        glVertex2f(-1.f, 1.f);
    glEnd();

    SDL_GL_SwapBuffers();
    // Stay on the screen for a bit.
    SDL_Delay(1000);

    SDL_Quit();

    return 0;
}