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.h"
28 #include "util/macros.h"
29
30 /**
31 * \file rogue_nir_pfo.c
32 *
33 * \brief Contains the rogue_nir_pfo pass.
34 */
35
insert_pfo(nir_builder * b,nir_intrinsic_instr * store_output,nir_src * output_src)36 static void insert_pfo(nir_builder *b,
37 nir_intrinsic_instr *store_output,
38 nir_src *output_src)
39 {
40 /* TODO: Support complex PFO with blending. */
41 /* TODO: Verify type is vec4. */
42
43 /* Pack the output color components into U8888 format. */
44 nir_def *new_output_src = nir_pack_unorm_4x8(b, output_src->ssa);
45
46 /* Update the store_output intrinsic. */
47 nir_src_rewrite(output_src, new_output_src);
48 nir_intrinsic_set_write_mask(store_output, 1);
49 store_output->num_components = 1;
50 nir_intrinsic_set_src_type(store_output, nir_type_uint32);
51 }
52
53 PUBLIC
rogue_nir_pfo(nir_shader * shader)54 void rogue_nir_pfo(nir_shader *shader)
55 {
56 nir_function_impl *impl = nir_shader_get_entrypoint(shader);
57 nir_builder b;
58
59 /* Only apply to fragment shaders. */
60 if (shader->info.stage != MESA_SHADER_FRAGMENT)
61 return;
62
63 b = nir_builder_create(impl);
64
65 nir_foreach_block (block, impl) {
66 nir_foreach_instr_safe (instr, block) {
67 if (instr->type == nir_instr_type_intrinsic) {
68 /* Find the store_output intrinsic and pack the output value. */
69 nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
70
71 if (intr->intrinsic != nir_intrinsic_store_output)
72 continue;
73
74 b.cursor = nir_before_instr(&intr->instr);
75 insert_pfo(&b, intr, &intr->src[0]);
76 } else if (instr->type == nir_instr_type_deref) {
77 /* Find variable derefs and update their type. */
78 nir_deref_instr *deref = nir_instr_as_deref(instr);
79
80 if (!nir_deref_mode_is(deref, nir_var_shader_out))
81 continue;
82
83 if (deref->deref_type != nir_deref_type_var)
84 continue;
85
86 nir_variable *out = nir_deref_instr_get_variable(deref);
87
88 deref->type = glsl_uintN_t_type(32);
89 out->type = glsl_uintN_t_type(32);
90 }
91 }
92 }
93 }
94