[Mesa-dev] [rfc/r600g] add support for primitive id without geom shader

[Dave Airlie]

Hey,

This didn't look like it should be too difficult, however I have
two worries about my approach

a) the prereq change to move the pixel shader selector,
   I should probably move more code, but it might not matter,
   but I worry this could have side effects though the ps key
   doesn't depend on vs/gs shaders.

b) the spi_sid addition to they key is 8-bits which is a
   sizeable key increase, maybe I could avoid this,

Advice on either of these welcome,

This seems to solve:
https://bugs.freedesktop.org/show_bug.cgi?id=78951

Dave.