The original value might have been swizzled. That's taken care of in
the fmul source - we don't want to reswizzle it again.
Fixes validation failures in glsl-derivs-varyings on a branch of mine
which uses this pass in i965.
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/compiler/nir/nir_lower_wpos_ytransform.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/src/compiler/nir/nir_lower_wpos_ytransform.c
b/src/compiler/nir/nir_lower_wpos_ytransform.c
index 5546788..41f8554 100644
--- a/src/compiler/nir/nir_lower_wpos_ytransform.c
+++ b/src/compiler/nir/nir_lower_wpos_ytransform.c
@@ -252,6 +252,9 @@ lower_fddy(lower_wpos_ytransform_state *state,
nir_alu_instr *fddy)
nir_instr_rewrite_src(&fddy->instr,
&fddy->src[0].src,
nir_src_for_ssa(pt));
+
+ for (unsigned i = 0; i < 4; i++)
+ fddy->src[0].swizzle[i] = MIN2(i, pt->num_components - 1);
}
static bool
--
2.8.2
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