#include "sprite.h"
#include <stdlib.h>

/*
We load in a surface temporarily, copy over the data to a texture (via createTexture), then free the surface. Return the Sprite, of course.
*/
struct Sprite *createSpriteFromFile(char *name, char *file) {
  struct Sprite *sprite = malloc(sizeof(struct Sprite));
  SDL_Surface *surface = NULL;
  if ( (surface = IMG_Load(file)) == NULL ) {
    printf("ERR: loadSpriteFromFile:IMG_Load(%s): \"%s\"", file, SDL_GetError());
    return NULL;
  }
  sprite->texture = createTexture(surface);
  sprite->width = surface->w;
  sprite->height = surface->h;
  // we're done with our surface, free it
  SDL_FreeSurface(surface);
  //printf("loaded with: %dx%d\n", sprite->width, sprite->height);
  return sprite;
}

int freeSprite(struct Sprite *sprite) {
  if (sprite == NULL) return 1;
  glDeleteTextures(1, &sprite->texture);
  free(sprite);
  return 0;
}

int renderSprite(struct Sprite *sprite, int x, int y) {
  if (sprite == NULL) return 1;

  float sx = sprite->width;
  float sy = sprite->height;
  // bind our texture
  glBindTexture(GL_TEXTURE_2D, sprite->texture);
  // make sure we're rendering textures
  glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
  // reset view
  glLoadIdentity();
  // translate to a quad
  glTranslated(x, y, 1.0f);
  // draw !
  glBegin(GL_QUADS);
    // top left
    glTexCoord2d(0.0f, 0.0f); glVertex2f(0.0f, 0.0f);
    // top right
    glTexCoord2d(1.0, 0.0f); glVertex2f(sx, 0.0f);
    // bottom right
    glTexCoord2d(1.0f, 1.0f); glVertex2f(sx, sy);
    // bottom left
    glTexCoord2d(0.0f, 1.0f); glVertex2f(0.0f, sy);
  glEnd();

  return 0;
}