Both the glXCreateGLXPbufferSGIX and glXCreatePbuffer requests require a core X11 pixmap to be created that is the same depth as the desired Pbuffer. That makes it impossible to make use of Pbuffers that have depth greater than 32bits since that is the limit imposed by core X11 for things like foreground, background and planemasks. These core X11 limits should not be imposed upon GLX.
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