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glFinish - block until all GL execution is complete
void
glFinish( void )
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.
glFlush(3G)
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