1/*
2 * Copyright © 2022 Imagination Technologies Ltd.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to deal
6 * in the Software without restriction, including without limitation the rights
7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8 * copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24#include "nir/nir.h"
25#include "nir/nir_builder.h"
26#include "nir/nir_search_helpers.h"
27#include "rogue_nir.h"
28
29static void insert_pfo(nir_builder *b,
30                       nir_intrinsic_instr *store_output,
31                       nir_src *output_src)
32{
33   /* TODO: Support complex PFO with blending. */
34   /* TODO: Verify type is vec4. */
35
36   /* Pack the output color components into U8888 format. */
37   nir_ssa_def *new_output_src_ssa = nir_pack_unorm_4x8(b, output_src->ssa);
38   nir_src new_output_src = nir_src_for_ssa(new_output_src_ssa);
39
40   /* Update the store_output intrinsic. */
41   nir_instr_rewrite_src(&store_output->instr, output_src, new_output_src);
42   nir_intrinsic_set_write_mask(store_output, 1);
43   store_output->num_components = 1;
44   nir_intrinsic_set_src_type(store_output, nir_type_uint32);
45}
46
47void rogue_nir_pfo(nir_shader *shader)
48{
49   nir_function_impl *impl = nir_shader_get_entrypoint(shader);
50   nir_builder b;
51
52   /* Only apply to fragment shaders. */
53   if (shader->info.stage != MESA_SHADER_FRAGMENT)
54      return;
55
56   nir_builder_init(&b, impl);
57
58   nir_foreach_block (block, impl) {
59      nir_foreach_instr_safe (instr, block) {
60         if (instr->type == nir_instr_type_intrinsic) {
61            /* Find the store_output intrinsic and pack the output value. */
62            nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
63
64            if (intr->intrinsic != nir_intrinsic_store_output)
65               continue;
66
67            b.cursor = nir_before_instr(&intr->instr);
68            insert_pfo(&b, intr, &intr->src[0]);
69         } else if (instr->type == nir_instr_type_deref) {
70            /* Find variable derefs and update their type. */
71            nir_deref_instr *deref = nir_instr_as_deref(instr);
72
73            if (!nir_deref_mode_is(deref, nir_var_shader_out))
74               continue;
75
76            if (deref->deref_type != nir_deref_type_var)
77               continue;
78
79            nir_variable *out = nir_deref_instr_get_variable(deref);
80
81            deref->type = glsl_uintN_t_type(32);
82            out->type = glsl_uintN_t_type(32);
83         }
84      }
85   }
86}
87