glFinish - block until all GL execution is complete
glFinish() does not return until the effects of all previously
called GL commands are complete. Such effects
include all changes to GL state, all changes to connection
state, and all changes to the frame buffer contents.
glFinish() requires a round trip to the server.
GL_INVALID_OPERATION is generated if glFinish() is executed
between the execution of glBegin() and the corresponding
execution of glEnd().
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