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CentOS 7.0 - man page for glflush (centos section 3g)

GLFLUSH(3G)					    OpenGL Manual					  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.
SEE ALSO
glFinish()
COPYRIGHT
Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org opengl.org 06/10/2014 GLFLUSH(3G)


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