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Man Pages


Manual Reference Pages  -  GLFLUSH (3)

NAME

glFlush - force execution of GL commands in finite time

CONTENTS

C Specification
Description
Notes
Errors
See Also

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
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GLFLUSH (-->)

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