Christian Gmeiner
a11501e014
If there is a FS input but no VS output the behavior is undefined
but okay. Use a register 0 (position) for such cases.
glsl-routing test triggers it with e.g. the following subtest.
Test: VS(C0 -- T0 -- T2 -- T4 T5)
FS(C0 C1 T0 T1 T2 T3 T4 T5)
This will now end with following linker debug output:
link result:
vs -> fs comps use pa_attr
t1 -> t1 xyzw 0,0,0,0 0x000002f1
t2 -> t2 xyzw 0,0,0,0 0x000002f1
t0 -> t3 xyzw 0,0,0,0 0x000002f1
t3 -> t4 xyzw 0,0,0,0 0x000002f1
t0 -> t5 xyzw 0,0,0,0 0x000002f1
t4 -> t6 xyzw 0,0,0,0 0x000002f1
t5 -> t7 xyzw 0,0,0,0 0x000002f1
Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24030>
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