glFlush man page on OpenBSD

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GLFLUSH(3G)							   GLFLUSH(3G)

NAME
       glFlush - force execution of GL commands in finite time

C SPECIFICATION
       void glFlush( void )

DESCRIPTION
       Different GL implementations buffer commands in several different
       locations, including network buffers and the graphics accelerator
       itself.	glFlush empties all of these buffers, causing all issued
       commands to be executed as quickly as they are accepted by the actual
       rendering engine.  Though this execution may not be completed in any
       particular time period, it does complete in finite time.

       Because any GL program might be executed over a network, or on an
       accelerator that buffers commands, all programs should call glFlush
       whenever they count on having all of their previously issued commands
       completed.  For example, call glFlush before waiting for user input
       that depends on the generated image.

NOTES
       glFlush can return at any time.	It does not wait until the execution
       of all previously issued GL commands is complete.

ERRORS
       GL_INVALID_OPERATION is generated if glFlush is executed between the
       execution of glBegin and the corresponding execution of glEnd.

SEE ALSO
       glFinish(3G)

								 March 1, 2011
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