[Bug 101572] glMemoryBarrier is backwards

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101572

Nicolai Hähnle <nhaehnle at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTOURBUG

--- Comment #1 from Nicolai Hähnle <nhaehnle at gmail.com> ---
You're misinterpreting the spec.

glMemoryBarrier ensures that **writes from shaders** are visible to whatever
consumer you indicate with the given flag bits.

What you seem to be trying to do is ensure that **writes via the framebuffer**
are visible in subsequent compute shader invocations. For that, you need to
either:

(1) Bind a different framebuffer, or (probably more appropriate to what you're
trying to do)
(2) use glTextureBarrier.

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