1 /*
2 * Copyright 2023 Valve Corporation
3 * SPDX-License-Identifier: MIT
4 */
5
6 #include "compiler/nir/nir.h"
7 #include "compiler/nir/nir_builder.h"
8 #include "agx_nir.h"
9
10 static bool
lower(nir_builder * b,nir_intrinsic_instr * intr,UNUSED void * data)11 lower(nir_builder *b, nir_intrinsic_instr *intr, UNUSED void *data)
12 {
13 if (intr->intrinsic != nir_intrinsic_store_output)
14 return false;
15
16 nir_io_semantics sem = nir_intrinsic_io_semantics(intr);
17 if (sem.location != VARYING_SLOT_CLIP_DIST0)
18 return false;
19
20 nir_instr *clone = nir_instr_clone(b->shader, &intr->instr);
21 nir_intrinsic_instr *lowered = nir_instr_as_intrinsic(clone);
22
23 b->cursor = nir_after_instr(&intr->instr);
24 nir_builder_instr_insert(b, clone);
25
26 nir_io_semantics new_sem = sem;
27 new_sem.no_varying = true;
28 nir_intrinsic_set_io_semantics(lowered, new_sem);
29
30 sem.no_sysval_output = true;
31 nir_intrinsic_set_io_semantics(intr, sem);
32 return true;
33 }
34
35 bool
agx_nir_lower_clip_distance(nir_shader * s)36 agx_nir_lower_clip_distance(nir_shader *s)
37 {
38 assert(s->info.outputs_written & VARYING_BIT_CLIP_DIST0);
39
40 return nir_shader_intrinsics_pass(
41 s, lower, nir_metadata_block_index | nir_metadata_dominance, NULL);
42 }
43