SDL PixelFormat question

/////////////////////////////////////////////////
void TextQuad::load_image( std::string filename )
/////////////////////////////////////////////////
{    
    //The loaded surface
    SDL_Surface *LoadedImage = NULL; 
    
    //The optimized surface
    SDL_Surface *OptimizedImage = NULL; 

    //The texture surface
    SDL_Surface *TextureImage = NULL; 
    
    //load image
    LoadedImage = IMG_Load( filename.c_str() );
    
    //If the image loaded fine
    if( LoadedImage != NULL )
    {
        //The format
        SDL_PixelFormat format;
        
        //Set format
        format.palette = NULL;
        format.BitsPerPixel = 32;
        format.BytesPerPixel = 4;
        
        //Set mask
        #if SDL_BYTEORDER == SDL_BIG_ENDIAN
        format.Rmask = 0xFF000000;
        format.Gmask = 0x00FF0000;
        format.Bmask = 0x0000FF00;
        format.Amask = 0x000000FF;
        #else
        format.Rmask = 0x000000FF;
        format.Gmask = 0x0000FF00;
        format.Bmask = 0x00FF0000;
        format.Amask = 0xFF000000;
        #endif
        
        //Set shift
        format.Rshift;
        format.Gshift;
        format.Bshift;
        format.Ashift;
        
        //Set loss
        format.Rloss;
        format.Gloss;
        format.Bloss;
        format.Aloss;
        
        //Optimize image
        TextureImage = SDL_ConvertSurface( LoadedImage, &format, SDL_SWSURFACE );
        
        //Get rid of temp surface
        SDL_FreeSurface( LoadedImage );
    }
    
    //Convert to 2^n surface
    
    
    //If the image loaded fine
    if( TextureImage != NULL )
    {  
        //Get the dimensions of surface
        w = TextureImage->w;
        h = TextureImage->h;
            
        //Generate texture
        glGenTextures( 1, &texture );

        //Use newly made texture
        glBindTexture( GL_TEXTURE_2D, texture );
        
        //Create texture from loaded surface
        glTexImage2D( GL_TEXTURE_2D, 0, 4, TextureImage->w, TextureImage->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, TextureImage->pixels );
	    
        //Set filtering
        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
        glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
	    
        //Get rid of temp surface
        SDL_FreeSurface( TextureImage );
    }
}