[Mesa-dev] [PATCH 00/13] Fix gl_VertexID on i965

[Kenneth Graunke]

On Sunday, June 22, 2014 03:59:01 AM Marek Olšák wrote:
> That's right. A uniform won't work with ARB_draw_indirect unless you
> lower it to direct draws, which would be very bad if it was applied to
> all drivers.
> 
> Radeonsi indeed supports BaseVertex and BaseInstance as system values
> in the vertex shader. Well, vertex fetching has to be done in the
> vertex shader on that hardware, so the system values are kinda
> required there.
> 
> Marek

FWIW, I've thrown together some patches for i965 which make gl_BaseVertex available as a system value, which I think is the right thing to do.  I've tested the indirect draw case, and it seems to work fine.

basevertex-v5 of my tree.  It needs cleaning up and testing, but the hard part is in place.  It mostly reuses Ian's existing GLSL IR lowering pass, too.

--Ken
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