#import "config.h"
#import "graphics.h"
#import "memory.h"
#import "gl_headers.h"
#import "oops.h"

#include "SDL.h"

void clear_screen()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}

void reshape_screen(int width, int height)
{
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluPerspective(60.0, (GLfloat) width / (GLfloat) height, 0.1, 100.0);
    glMatrixMode(GL_MODELVIEW);
}

graphics *new_graphics(graphics_settings settings)
{
    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER) < 0) {
        oops(critical_error, "Wow. This... has never happened to me before. I just don't know what to say.");
    }
    // Try to get a 16-bit depth buffer.
    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
    
    // Double-buffer output.
    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
    
    Uint32 flags = SDL_OPENGL;
    if (settings.fullscreen) {
        flags |= SDL_FULLSCREEN;
    }

    graphics *new_graphics = alloc(sizeof(graphics));
    new_graphics->screen = SDL_SetVideoMode(settings.screen_width, settings.screen_height, 0, flags);
    if (new_graphics->screen == NULL) {
        oops(critical_error, "Couldn't set up the screen.  Are you running a really old computer or something?");
    }
    
    glClearDepth(100.0f);
    glDepthFunc(GL_LESS);
    glEnable(GL_DEPTH_TEST);
    
    glClearColor(0.5, 0.1, 0.9, 1.0);
    
    reshape_screen(settings.screen_width, settings.screen_height);
    
    new_graphics->cam = retain(new_camera(settings));
    
    return new_graphics;
}