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nir: lower load_barycentric_at_offset in lower_wpos_ytransform

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so that we can run this pass on lowered IO.

Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21861>
This commit is contained in:
Marek Olšák 2023-02-28 17:24:08 -05:00 • committed by Marge Bot
parent ace8a7068e
commit bd9ea4b5bc
1 changed files with 13 additions and 9 deletions
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22
src/compiler/nir/nir_lower_wpos_ytransform.c
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@ -33,8 +33,6 @@
*
* This is based on the logic in emit_wpos()/emit_wpos_adjustment() in TGSI
* compiler.
*
* Run before nir_lower_io.
*/
typedef struct {
@ -256,25 +254,29 @@ lower_fddy(lower_wpos_ytransform_state *state, nir_alu_instr *fddy)
fddy->src[0].swizzle[i] = MIN2(i, pt->num_components - 1);
}
/* Multiply interp_deref_at_offset's offset by transform.x to flip it. */
/* Multiply interp_deref_at_offset's or load_barycentric_at_offset's offset
* by transform.x to flip it.
*/
static void
lower_interp_deref_at_offset(lower_wpos_ytransform_state *state,
nir_intrinsic_instr *interp)
lower_interp_deref_or_load_baryc_at_offset(lower_wpos_ytransform_state *state,
nir_intrinsic_instr *intr,
unsigned offset_src)
{
nir_builder *b = &state->b;
nir_ssa_def *offset;
nir_ssa_def *flip_y;
b->cursor = nir_before_instr(&interp->instr);
b->cursor = nir_before_instr(&intr->instr);
offset = nir_ssa_for_src(b, interp->src[1], 2);
offset = nir_ssa_for_src(b, intr->src[offset_src], 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[1],
nir_instr_rewrite_src(&intr->instr, &intr->src[offset_src],
nir_src_for_ssa(nir_vec2(b, nir_channel(b, offset, 0),
flip_y)));
}
static void
lower_load_sample_pos(lower_wpos_ytransform_state *state,
nir_intrinsic_instr *intr)
@ -320,7 +322,9 @@ lower_wpos_ytransform_block(lower_wpos_ytransform_state *state, nir_block *block
} else if (intr->intrinsic == nir_intrinsic_load_sample_pos) {
lower_load_sample_pos(state, intr);
} else if (intr->intrinsic == nir_intrinsic_interp_deref_at_offset) {
lower_interp_deref_at_offset(state, intr);
lower_interp_deref_or_load_baryc_at_offset(state, intr, 1);
} else if (intr->intrinsic == nir_intrinsic_load_barycentric_at_offset) {
lower_interp_deref_or_load_baryc_at_offset(state, intr, 0);
}
} else if (instr->type == nir_instr_type_alu) {
nir_alu_instr *alu = nir_instr_as_alu(instr);