The lead developer of XreaL is Robert Beckebans, who has been working to deliver stunning graphics capabilities to the id Tech 3 engine. As far he knows, XreaL is actually the only Quake-based engine with a pure GLSL (GL Shading Language) renderer. With his GLSL renderer for XreaL, he wrote it entirely against the OpenGL 2.0 ES specification, so that it is very minimalist in order to avoid driver problems.
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