[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 #1 from Michel Dänzer <michel at daenzer.net> ---
AFAICT the hardware doesn't provide any way to retrieve the primitive ID
without a geometry shader, so we'd probably need to use a passthrough geometry
shader for this. Any volunteers?

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