Mixing Of Opengl And Xlib - HP b2600 Supplementary Manual

Chapter 1

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.
overview of OpenGL
mixing of OpenGL and Xlib
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