Recommended wolf3d iphone game source code

Wolf3D game source code. Very suitable for iphone game developers learn to borrow.
Wolfenstein 3D using OpenGL for 3D rendering. You can learn how to id Software is how OpenGL rendering.

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Thank you for sharing! Remembered the former under DOS games, "Valkyrie"
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Yes, it's a good long way. Is the source code? Useful for what the game engine?