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OpenGL opengl texture to SDL surface

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This is kind of an SDL question as well, but probably belongs here since I'm looking for the right GL function. My texture class keeps an SDL surface so that the GL texture can be reloaded when needed (like during a fullscreeen toggle, for instance), since the SDL surface never "goes out of scope." So I know how to go from an SDL surface to an OpenGL texture with no problem--but what about going from an OpenGL texture to an SDL surface? For example, I have a openFromScreen function that returns a texture that is a copy of the specified portion of the screen buffer...this is a pure GL call, so there is a resulting OpenGL texture, but no SDL surface. If my app then toggles fullscreen, there is no surface to reload from. Is there anyway to get at the pixel data in an OpenGL texture so I can copy it to an SDL surface that I know will stay there?

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