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nir: Fix fddy swizzles in nir_lower_wpos_ytransform().

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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 <kenneth@whitecape.org>
Reviewed-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Kenneth Graunke 2016-05-17 23:16:14 -07:00
parent 7fe9a19302
commit 287f099db1
1 changed files with 3 additions and 0 deletions
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3
src/compiler/nir/nir_lower_wpos_ytransform.c
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@ -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