Provided by: opengl-4-man-doc_1.0~svn33624-1_all 
NAME
glFenceSync - create a new sync object and insert it into the GL command stream
C SPECIFICATION
GLsync glFenceSync(GLenum condition, GLbitfield flags);
PARAMETERS
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
Specifies a bitwise combination of flags controlling the behavior of the sync object. No flags are
presently defined for this operation and flags must be zero.[1]
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_ENUM is generated if condition is not GL_SYNC_GPU_COMMANDS_COMPLETE.
GL_INVALID_VALUE is generated if flags is not zero.
Additionally, if glFenceSync fails, it will return zero.
VERSION SUPPORT
┌────────────┬───────────────────────────────────────────────────────────────────────┐
│ │ OpenGL Version │
├────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
│Function │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
│/ │ │ │ │ │ │ │ │ │ │ │ │ │
│Feature │ │ │ │ │ │ │ │ │ │ │ │ │
│Name │ │ │ │ │ │ │ │ │ │ │ │ │
├────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glFenceSync │ - │ - │ - │ - │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
└────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘
SEE ALSO
glDeleteSync(), glGetSync(), glWaitSync(), glClientWaitSync()
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/.
COPYRIGHT
Copyright © 2010-2014 Khronos Group
NOTES
1. flags is a placeholder for anticipated future extensions of fence sync object capabilities. [FIXME: source] 01/03/2018 GLFENCESYNC(3G)