NAME

       glTextureBarrier - controls the ordering of reads and writes to rendered fragments across
       drawing commands

C SPECIFICATION

       void glTextureBarrier(void);

DESCRIPTION

       The values of rendered fragments are undefined when a shader stage fetches texels and the
       same texels are written via fragment shader outputs, even if the reads and writes are not
       in the same drawing command. To safely read the result of a written texel via a texel
       fetch in a subsequent drawing command, call glTextureBarrier between the two drawing
       commands to guarantee that writes have completed and caches have been invalidated before
       subsequent drawing commands are executed.

NOTES

       The situation described above is referred to as a rendering feedback loop and is discussed
       in more detail in section 9.3 of the OpenGL 4.5 Specification.

ERRORS

       None.

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             │     │     │     │     │     │     │     │     │     │     │     │     │
       ├─────────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │glTextureBarrier │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  ✔  │
       └─────────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘

SEE ALSO

       glMemoryBarrier()

COPYRIGHT

       Copyright © 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 © 2014 Khronos Group

[FIXME: source]                             07/22/2015                       GLTEXTUREBARRIER(3G)