... cause the CPU to wait for the gl command buffer to clear?
Indeed it would. It doesn't cause the entire GPU pipeline to drain
(like glReadPixels, for example) but would require the command buffers
in the server to be processed before you get your answer.
I advocate shadowing the state you'd be querying via glGet*,
glIsEnabled(), etc. whenever you can. But in cases where these calls
are necessary, try to group them temporally so there's only one
meaningful "drain" point. Having them sprinkled around the frame is a
worse hit.
Allan
___________
Allan Schaffer
Graphics Evangelist
Worldwide Developer Relations
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