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indices: fix provoking vertex for quads/quadstrips

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This allows drivers to provide consistent flat shading for quads.
Otherwise a driver that only supported tris would have to force last
provoking vertex when drawing quads (and would have to say that quads
don't follow the provoking vertex convention).

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Rob Clark <robclark@freedesktop.org>
This commit is contained in:
Ilia Mirkin 2015-04-07 01:42:05 -04:00
parent 1cdb01d716
commit b2e871bd48
1 changed files with 10 additions and 3 deletions
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13
src/gallium/auxiliary/indices/u_indices_gen.py
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@ -142,8 +142,12 @@ def do_tri( intype, outtype, ptr, v0, v1, v2, inpv, outpv ):
tri( intype, outtype, ptr, v2, v0, v1 )
def do_quad( intype, outtype, ptr, v0, v1, v2, v3, inpv, outpv ):
do_tri( intype, outtype, ptr+'+0', v0, v1, v3, inpv, outpv );
do_tri( intype, outtype, ptr+'+3', v1, v2, v3, inpv, outpv );
if inpv == LAST:
do_tri( intype, outtype, ptr+'+0', v0, v1, v3, inpv, outpv );
do_tri( intype, outtype, ptr+'+3', v1, v2, v3, inpv, outpv );
else:
do_tri( intype, outtype, ptr+'+0', v0, v1, v2, inpv, outpv );
do_tri( intype, outtype, ptr+'+3', v0, v2, v3, inpv, outpv );
def name(intype, outtype, inpv, outpv, pr, prim):
if intype == GENERATE:
@ -331,7 +335,10 @@ def quadstrip(intype, outtype, inpv, outpv, pr):
print ' i += 4;'
print ' goto restart;'
print ' }'
do_quad( intype, outtype, 'out+j', 'i+2', 'i+0', 'i+1', 'i+3', inpv, outpv );
if inpv == LAST:
do_quad( intype, outtype, 'out+j', 'i+2', 'i+0', 'i+1', 'i+3', inpv, outpv );
else:
do_quad( intype, outtype, 'out+j', 'i+0', 'i+1', 'i+3', 'i+2', inpv, outpv );
print ' }'
postamble()