glFlush man page on DigitalUNIX

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glFlush(3G)							   glFlush(3G)

NAME
       glFlush - force execution of GL commands in finite time

SYNOPSIS
       void glFlush(
	       void );

DESCRIPTION
       Different GL implementations buffer commands in several different loca‐
       tions, 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(3)

								   glFlush(3G)
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