GLFLUSH

Section: Misc. Reference Manual Pages (3G)
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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)