glIsAsyncMarkerSGIX(3G)	       OpenGL Reference	       glIsAsyncMarkerSGIX(3G)

NAME    [Toc]    [Back]

     glIsAsyncMarkerSGIX - determine if	a marker is reserved or	in use

C SPECIFICATION    [Toc]    [Back]

     GLboolean glIsAsyncMarkerSGIX( GLuint marker )

PARAMETERS    [Toc]    [Back]

     marker  Specifies a potential value for a reserved	or in-use marker.

DESCRIPTION    [Toc]    [Back]

     glIsAsyncMarkerSGIX is part of the	SGIX_async extension.  This extension
     provides a	framework within which particular sets of OpenGL commands can
     become "asynchronous" via specific	further	OpenGL extensions.  Currently
     the SGIX_async_pixel extension is the only	such defined extension.

     A marker for asynchronous commands	is "in use" if it is the current value
     of	GL_ASYNC_MARKER_SGIX, or if it is associated with any asynchronous
     command that has been issued but has not been queried using
     glFinishAsyncSGIX or glPollAsyncSGIX.  A marker may be "reserved" via use
     of	the glGenAsyncMarkersSGIX command.

     glIsAsyncMarkerSGIX returns 1 if marker identifies	a marker that is
     currently in use or reserved; it returns 0	otherwise.

ERRORS    [Toc]    [Back]

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


MACHINE	DEPENDENCIES
     The SGIX_async and	SGIX_async_pixel extensions are	implemented only on
     Octane2 VPro systems.

SEE ALSO    [Toc]    [Back]

     glAsyncMarkerSGIX,	glDeleteAsyncMarkersSGIX, glFinishAsyncSGIX,
     glGenAsyncMarkersSGIX, glPollAsyncSGIX, glDrawPixels, glGet,
     glReadPixels, glTexImage1D, glTexImage2D, glTexImage3D, glTexSubImage1D,
     glTexSubImage2D, glTexSubImage3D


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