[Mesa-dev] intel: FS compile failed: no register to spill

[Eric Anholt]

Johannes Stezenbach <js at sig21.net> writes:

> Hi,
>
> I'm experimenting with texture interpolation and seeing this error:
>
>   Mesa 8.0.4 implementation error: Failed to compile fragment shader: FS compile failed: no register to spill
>
>   Please report at bugs.freedesktop.org
>
> It seems the issue is already known, I found
> https://bugs.freedesktop.org/show_bug.cgi?id=48375
> and
> http://code.google.com/p/chromium-os/issues/detail?id=28524
>
> I'm using Debian unstable amd64 on Sandy Bridge Core i5-2400S.
>
> It seems the fix for the chromium-os issue is in Mesa 9.0 but not in 8.0.4,
> thus I fetched the Debian source package and recompiled with the fix
> applied, but it did not help in my case.
> http://cgit.freedesktop.org/mesa/mesa/commit/?id=8890c759513597903997f519c69e9db30790b6f4

That commit is a change for debug printfs.  If you just applied that, it
wouldn't help.  You should try Mesa master.

> Attached is a (stripped-down) Python-OpenGL script and fragment shader
> which demonstrates the issue.  The shader code is taken from 
> http://www.codeproject.com/Articles/236394/Bi-Cubic-and-Bi-Linear-Interpolation-with-GLSL
> (shader coding style ugliness is from the original source)
> The script doesn't do anything useful, in the ideal case it
> would just print "now" and "end" without throwing an error.
>
> BTW, the compile error is thrown at glutSwapBuffers() not at
> glCompileShaderARB() time.  Is there a way to force the error
> to show up earlier?

Ask for the shader's compile status and then the program's link status.
Take a look at piglit/tests/util/.

> Is that the current state of affairs that using loops in GLSL is
> basically broken on Intel?  Any hope to get it fixed?

Works fine on current Mesa.
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