glFinish: block until all GL execution is complete.
C Specification |
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.