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nir: Add interp_var_at_offset flipping.

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The Y-offset needs flipping as well, similar to ddy.

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 03:30:58 -07:00
parent 287f099db1
commit c9192fcbd2
1 changed files with 21 additions and 0 deletions
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21
src/compiler/nir/nir_lower_wpos_ytransform.c
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@@ -257,6 +257,25 @@ lower_fddy(lower_wpos_ytransform_state *state, nir_alu_instr *fddy)
fddy->src[0].swizzle[i] = MIN2(i, pt->num_components - 1);
}
/* Multiply interp_var_at_offset's offset by transform.x to flip it. */
static void
lower_interp_var_at_offset(lower_wpos_ytransform_state *state,
nir_intrinsic_instr *interp)
{
nir_builder *b = &state->b;
nir_ssa_def *offset;
nir_ssa_def *flip_y;
b->cursor = nir_before_instr(&interp->instr);
offset = nir_ssa_for_src(b, interp->src[0], 2);
flip_y = nir_fmul(b, nir_channel(b, offset, 1),
nir_channel(b, get_transform(state), 0));
nir_instr_rewrite_src(&interp->instr, &interp->src[0],
nir_src_for_ssa(nir_vec2(b, nir_channel(b, offset, 0),
flip_y)));
}
static bool
lower_wpos_ytransform_block(lower_wpos_ytransform_state *state, nir_block *block)
{
@@ -272,6 +291,8 @@ lower_wpos_ytransform_block(lower_wpos_ytransform_state *state, nir_block *block
assert(dvar->deref.child == NULL);
lower_fragcoord(state, intr);
}
} else if (intr->intrinsic == nir_intrinsic_interp_var_at_offset) {
lower_interp_var_at_offset(state, intr);
}
} else if (instr->type == nir_instr_type_alu) {
nir_alu_instr *alu = nir_instr_as_alu(instr);