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Blitting SDL + OpenGL screen surface to another surface

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I would like to blit my OpenGL-rendered screen as an SDL surface on to another (non-screen) SDL surface. Is this possible? If so, can you please give me some hints or suggestions to go about this problem? Thanks!

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Yes.

void glReadPixels(GLint x,
GLint y,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
GLvoid *pixels)

You can send image->pixels as the last parameter where image is SDL_Surface*

Keep in mind that this is pretty slow...

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