Manual Reference Pages - GLFINISH (3)
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.
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