GLFINISH(3G) GLFINISH(3G)

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