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Editorial Team
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Asked: 2026-06-06T12:46:17+00:00

Should be a simple question for SDL experts. I am confused about the following

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Should be a simple question for SDL experts. I am confused about the following two seemingly equivalent functions and wondering when to use which

SDL_Surface * SDL_SetVideoMode (int width, int height, int bpp, Uint32 flags);
SDL_Surface * SDL_CreateRGBSurface (Uint32 flags,
        int width, int height, int depth,
        Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask);

What’s the fundamental difference between the above two?

It’s mentioned here that SDL_CreateRGBSurface has to be called after SDL_SetVideoMode. Why is that so?

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1 Answer

  1. Editorial Team

    SDL_SetVideoMode creates a window. This surface will be visible on the screen.

    SDL_CreateRGBSurface creates off-screen image. SDL_CreateRGBSurface is used, for example, when you load images from disk. You need to blit it to the screen in order to see them.

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