[Bug 78951] gl_PrimitiveID is zero if no geometry shader is present

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78951

--- Comment #5 from Ian Romanick <idr at freedesktop.org> ---
(In reply to pavol from comment #4)
> I do not have radeonsi supported device. How does Intel driver support this?
> I think this is really useful for picking algorithm.

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.

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