[Mesa-users] GLSL: brw_eu.h assertion setting uniform variable

[Brian Paul]

On 05/11/2011 04:48 PM, Jason Tiller wrote:
> Hi, All, :)
>
> When trying to use a uniform value in a simple GLSL vertex shader, I
> am getting the following abort:
>
> brw_eu.h:177: brw_reg: Assertion `nr < 128' failed.
> Aborted
>
> I've tried this using raw GLUT (glGetUniformLocation/getUniform1i) as
> well as implementing this in Qt 4.7 (setUniformValue). The shader
> does dead simple Gouraud shading. I link it along with a super-simple
> passthrough fragment shader. I'm using the uniform variable to pass
> in the number of lights in the scene. I declare the variable at the
> top of my shader:
>
> uniform int numlights;
>
> If I turn the variable into a const:
>
> const int numlights = 2;
>
> then it works perfectly. Of course, I need to pass uniforms into my
> shader...
>
> Any ideas? I'm running:
>
> Kubuntu 11.04 (turned off all effects in KWin)
> KDE 4.6.3
> Qt 4.7.2
> Intel i5 430M w/i915 embedded graphics
> OpenGL 2.1, Mesa 7.10.2
> Xorg 1.10.1-1ubuntu1
>
> I'm desperate! This makes no sense at all to me, and I have no idea
> where to go from here.
>
> Thank you!
>
> ---Jason
>
> P.S. - I've tried fiddling with MESA_GLSL=... and can see my shaders
> getting compiled, the program being used, and the uniform variable
> being set... but still the abort. HELP!

You should file a bug for this.  Or, try the latest Mesa code from git.

-Brian