bonjour a tout

je code un petit moteur 3D et je voudrais savoir si les image son stoker dans la RAM ou dans la memoire video avec la fonction "loadTexture" que Kayl donne avec son tutorial :

GLuint loadTexture(const char * filename,bool useMipMap)
{
    GLuint glID;
    SDL_Surface * picture_surface = NULL;
    SDL_Surface *gl_surface = NULL;
    SDL_Surface * gl_fliped_surface = NULL;
    Uint32 rmask, gmask, bmask, amask;

    picture_surface = IMG_Load(filename);
    if (picture_surface == NULL)
        return 0;

#if SDL_BYTEORDER == SDL_BIG_ENDIAN

    rmask = 0xff000000;
    gmask = 0x00ff0000;
    bmask = 0x0000ff00;
    amask = 0x000000ff;
#else

    rmask = 0x000000ff;
    gmask = 0x0000ff00;
    bmask = 0x00ff0000;
    amask = 0xff000000;
#endif

    SDL_PixelFormat format = *(picture_surface->format);
    format.BitsPerPixel = 32;
    format.BytesPerPixel = 4;
    format.Rmask = rmask;
    format.Gmask = gmask;
    format.Bmask = bmask;
    format.Amask = amask;

    gl_surface = SDL_ConvertSurface(picture_surface,&format,SDL_SWSURFACE);

    gl_fliped_surface = flipSurface(gl_surface);

    glGenTextures(1, &glID);

    glBindTexture(GL_TEXTURE_2D, glID);


    if (useMipMap)
    {

        gluBuild2DMipmaps(GL_TEXTURE_2D, 4, gl_fliped_surface->w,
                          gl_fliped_surface->h, GL_RGBA,GL_UNSIGNED_BYTE,
                          gl_fliped_surface->pixels);

        glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,
                        GL_LINEAR_MIPMAP_LINEAR);

    }
    else
    {
        glTexImage2D(GL_TEXTURE_2D, 0, 4, gl_fliped_surface->w,
                     gl_fliped_surface->h, 0, GL_RGBA,GL_UNSIGNED_BYTE,
                     gl_fliped_surface->pixels);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    }
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);


    SDL_FreeSurface(gl_fliped_surface);
    SDL_FreeSurface(gl_surface);
    SDL_FreeSurface(picture_surface);

    return glID;
}

je demande sa car je voudrai optimiser mon code et donc mettre les texture dans la mémoire vidéo

merci d'avance