texture class load

texture.cpp

SDL_Surface *surface = NULL;

if ((surface = IMG_Load(filename.c_str()))) {
   _colours = surface->format->BytesPerPixel;

   // get the image format
   if (_colours == 4) {
      if (surface->format->Rmask == 0x000000ff) {
         _format = GL_RGBA;
      } else {
         _format = GL_BGRA;
      }
   } else if (_colours == 3) {
      if (surface->format->Rmask == 0x000000ff) {
         _format = GL_RGB;
      } else {
         _format = GL_BGR;
      }
   }

   // generate the gl texture
   glGenTextures(1, &_texture);
   glBindTexture(GL_TEXTURE_2D, _texture);

   // set filter parameters
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

   // send the loaded binary into open gl
   glTexImage2D(GL_TEXTURE_2D, 0, _colours,
         surface->w, surface->h,
         0, _format,
         GL_UNSIGNED_BYTE, surface->pixels);

   SDL_FreeSurface(surface);
} else {
   return false;
}

return true