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)