[Bug 76323] New: GLSL compiler ignores layout(binding=N) on uniform blocks

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76323

          Priority: medium
            Bug ID: 76323
          Assignee: idr at freedesktop.org
           Summary: GLSL compiler ignores layout(binding=N) on uniform
                    blocks
        QA Contact: intel-3d-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: github at socker.lepus.uberspace.de
          Hardware: Other
            Status: NEW
           Version: 10.1
         Component: glsl-compiler
           Product: Mesa

Created attachment 96005
  --> https://bugs.freedesktop.org/attachment.cgi?id=96005&action=edit
minimal example using glfw and glm

Hi Folks,

it seems that the GLSL compiler (or maybe some other component) simply ignores
a layout(binding=N) specifier on uniform blocks. This means, no matter what you
set there, the binding is always overridden by some default value (when having
a single uniform block it seems to be always 0).

I've attached a simple test program (could be a little simpler, I just copied
stuff together from my projects) that demonstrates the bug. The program either
works when binding the uniform buffer to binding point 0, or when manually
setting the shaders bind point with glUniformBlockBinding.

Tested on a Intel HD4000 with Mesa 10.0.3 and Mesa 10.1.0 on Arch Linux. Tried
Kernels 3.13.5 and 3.13.6. The program works on a nVidia GeForce 9600 GT with
the proprietary driver (haven't tested nouveau yet).

Regards

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