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gallium/aux: reorder vertex attributes in triangle fans according to PV

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With triangle fans when "first vertex convention" is active the
provoking vertex is actually the second vertex so that the different
triangle can have different colors with flat shading. Take this into
account when re-ordering the vertex indices (as proposed by Erik)

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5976>
This commit is contained in:
Gert Wollny 2020-07-14 15:28:00 +02:00 • committed by Marge Bot
parent f5cce8929a
commit fcc7a1e7b6
1 changed files with 5 additions and 1 deletions
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6
src/gallium/auxiliary/indices/u_indices_gen.py
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@ -294,7 +294,11 @@ def trifan(intype, outtype, inpv, outpv, pr):
print(' start = i;')
prim_restart(3, 3, 1, close_func)
do_tri( intype, outtype, 'out+j', 'start', 'i+1', 'i+2', inpv, outpv );
if inpv == FIRST:
do_tri( intype, outtype, 'out+j', 'i+1', 'i+2', 'start', inpv, outpv );
else:
do_tri( intype, outtype, 'out+j', 'start', 'i+1', 'i+2', inpv, outpv );
print(' }')
postamble()