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<body><span class="vcard"><a class="email" href="mailto:apinheiro@igalia.com" title="Alejandro Piņeiro (freenode IRC: apinheiro) <apinheiro@igalia.com>"> <span class="fn">Alejandro Piņeiro (freenode IRC: apinheiro)</span></a>
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<a class="bz_bug_link
bz_status_NEW "
title="NEW - Mesa's compiler should warn about undefined values"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94129">bug 94129</a>
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<td>apinheiro@igalia.com
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Mesa's compiler should warn about undefined values"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94129#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Mesa's compiler should warn about undefined values"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94129">bug 94129</a>
from <span class="vcard"><a class="email" href="mailto:apinheiro@igalia.com" title="Alejandro Piņeiro (freenode IRC: apinheiro) <apinheiro@igalia.com>"> <span class="fn">Alejandro Piņeiro (freenode IRC: apinheiro)</span></a>
</span></b>
<pre>(In reply to Kenneth Graunke from <a href="show_bug.cgi?id=94129#c0">comment #0</a>)
<span class="quote">> Many WebGL programs accidentally use undefined values, expecting them to be
> zero initialized (which is not required). NVidia apparently issues a
> compiler warning in this case. </span >
FWIW, although it is true that NVIDIA driver seems more verbose with respect to
warnings, I have just tested on GL_VERSION = 4.5.0 NVIDIA 352.55, and I didn't
see any warning on a shader like this:
#version 130
in vec3 color;
out vec4 outColor;
void main() {
vec4 undefined;
outColor = vec4(color, 1.0) + undefined;
}
That shows a lot of crap on string.
<span class="quote">> We should too.</span >
If you don't mind I will take a look to this bug.
<span class="quote">> This is fairly easy to detect in NIR - see if ssa_undefs are used. </span >
Will start looking here.
<span class="quote">> But,
> it's not clear whether we can issue warnings from that level.</span >
Ok.</pre>
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