void make_tga_texture()
{
  // open the file
  FILE *file = fopen("assets/ship3.tga","rb");
  assert( file != NULL && "could not open file" );

  // find length and allocate buffer
  fseek(file, 0, SEEK_END);
  int length = ftell(file);
  uchar *tmp = new uchar[length];

  // read the file
  fseek(file, 0, SEEK_SET);
  fread(tmp, 1, length, file);
  fclose(file);

  // convert the data
  TgaHeader *header = (TgaHeader*)tmp;
  uchar *data = tmp + sizeof(TgaHeader);

  int width = le2(header->width);
  int height = le2(header->height);

  // make sure this is the GIMP flavour
  assert(header->identsize == 0);
  assert(header->colourmaptype == 0);
  assert(header->imagetype == 2);
  assert(header->bits == 32);
  assert(header->descriptor == 8);

  // swap red and blue!

  /*
  for (int y = 0; y != width; ++y)
  {
    for (int x = 0; x != height; ++x)
    {
      uchar red = data[y * width * 3 + x*3 + 2];
      uchar blue = data[y * width * 3 + x*3 + 0];
      data[y * width * 3 + x*3 + 0] = red;
      data[y * width * 3 + x*3 + 2] = blue;
    }
  }
  */

  // build the texture
  glBindTexture(GL_TEXTURE_2D, state.textures[1]);
  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, (void*)data);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

  delete [] tmp;
}