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overview of OpenGL

mixing of OpenGL and Xlib

Chapter 1 17

mixing of OpenGL and Xlib

The OpenGL implementation conforms to the specification definition for

mixing of Xlib and OpenGL rendering to the same drawable. The

following points should be considered when mixing Xlib and OpenGL:

• OpenGL and Xlib renderers are implemented through separate

pipelines and control streams, thus, rendering synchronization must

be performed as necessary by the user’s application via the GLX

glXWaitX() and glXWaitGL() function calls.

• Xlib rendering does not affect the Z-buffer, so rendering in X and

then OpenGL would result in the OpenGL rendering replacing the

Xlib rendering. This is true if the last OpenGL rendering to the

Z-buffer at that location resulted in the depth test passing.

Note that mixing Xlib rendering with OpenGL rendering as well as with

VMD, when using alpha buffers, can produce unexpected side effects and

should be avoided.

OGLImp.book Page 17 Tuesday, February 14, 2006 9:15 AM

HP j6700 Supplementary Guide

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