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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - gl_PrimitiveID is zero if no geometry shader is present"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78951#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - gl_PrimitiveID is zero if no geometry shader is present"
href="https://bugs.freedesktop.org/show_bug.cgi?id=78951">bug 78951</a>
from <span class="vcard"><a class="email" href="mailto:idr@freedesktop.org" title="Ian Romanick <idr@freedesktop.org>"> <span class="fn">Ian Romanick</span></a>
</span></b>
<pre>(In reply to pavol from <a href="show_bug.cgi?id=78951#c4">comment #4</a>)
<span class="quote">> I do not have radeonsi supported device. How does Intel driver support this?
> I think this is really useful for picking algorithm.</span >
The piglit test tests/spec/glsl-1.50/execution/primitive-id-no-gs.shader_test
is for this very case. That test passes at least on my Ivybridge. I don't
know what we do in the driver to make this work... or if the hardware just
sorts it out.</pre>
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