Signature
Parameters
| Variables | Description |
|---|---|
| condition |
Specifies the condition that must be met to set the sync object's state to signaled.
condition
must be
GL_SYNC_GPU_COMMANDS_COMPLETE
.
|
| flags |
Description
glFenceSync
creates a new fence sync object, inserts a fence command into the GL command stream and
associates it with that sync object, and returns a non-zero name corresponding to the sync object.
When the specified
condition
of the sync object is satisfied by the fence command, the sync object
is signaled by the GL, causing any
glWaitSync
,
glClientWaitSync
commands blocking in
sync
to
unblock
. No other state is affected by
glFenceSync
or by the execution
of the associated fence command.
condition
must be
GL_SYNC_GPU_COMMANDS_COMPLETE
. This condition is satisfied by
completion of the fence command corresponding to the sync object and all preceding commands in the same command stream.
The sync object will not be signaled until all effects from these commands on GL client and server state and the
framebuffer are fully realized. Note that completion of the fence command occurs once the state of the corresponding sync
object has been changed, but commands waiting on that sync object may not be unblocked until after the fence command completes.
Notes
glFenceSync
is only supported if the GL version is 3.2 or greater, or if
the
ARB_sync
extension is supported.
Errors
GL_INVALID_VALUE
is generated if
flags
is not zero.
Additionally, if
glFenceSync
fails, it will return zero.
Version Support
| glFenceSync |
See Also
Copyright
Copyright
2010-2014 Khronos Group.
This material may be distributed subject to the terms and conditions set forth in
the Open Publication License, v 1.0, 8 June 1999.
http://opencontent.org/openpub/
.
Sample Code References
The following code samples have been found which appear to reference the functions described here. Take care that the code may be old, broken or not even use PyOpenGL.
glFenceSync