1 /*
2 * Copyright © 2018 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included
12 * in all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
20 * DEALINGS IN THE SOFTWARE.
21 */
22
23 #include "st_nir.h"
24 #include "st_program.h"
25
26 #include "compiler/nir/nir_builder.h"
27 #include "compiler/glsl/gl_nir.h"
28 #include "compiler/glsl/gl_nir_linker.h"
29
30 void
st_nir_finish_builtin_nir(struct st_context * st,nir_shader * nir)31 st_nir_finish_builtin_nir(struct st_context *st, nir_shader *nir)
32 {
33 struct pipe_screen *screen = st->screen;
34 gl_shader_stage stage = nir->info.stage;
35
36 MESA_TRACE_FUNC();
37
38 nir->info.separate_shader = true;
39 if (stage == MESA_SHADER_FRAGMENT)
40 nir->info.fs.untyped_color_outputs = true;
41
42 NIR_PASS(_, nir, nir_lower_system_values);
43
44 struct nir_lower_compute_system_values_options cs_options = {
45 .has_base_global_invocation_id = false,
46 .has_base_workgroup_id = false,
47 };
48 NIR_PASS(_, nir, nir_lower_compute_system_values, &cs_options);
49
50 if (st->lower_rect_tex) {
51 const struct nir_lower_tex_options opts = { .lower_rect = true, };
52 NIR_PASS(_, nir, nir_lower_tex, &opts);
53 }
54
55 nir_shader_gather_info(nir, nir_shader_get_entrypoint(nir));
56 nir_recompute_io_bases(nir, nir_var_shader_in | nir_var_shader_out);
57
58 st_nir_lower_samplers(screen, nir, NULL, NULL);
59 st_nir_lower_uniforms(st, nir);
60 if (!screen->caps.nir_images_as_deref)
61 NIR_PASS(_, nir, gl_nir_lower_images, false);
62
63 assert(nir->info.stage == MESA_SHADER_COMPUTE || nir->info.io_lowered);
64
65 if (nir->info.io_lowered &&
66 !(nir->options->io_options & nir_io_has_intrinsics)) {
67 NIR_PASS(_, nir, st_nir_unlower_io_to_vars);
68 gl_nir_opts(nir);
69 }
70
71 if (screen->finalize_nir) {
72 char *msg = screen->finalize_nir(screen, nir);
73 free(msg);
74 } else {
75 gl_nir_opts(nir);
76 }
77 }
78
79 void *
st_nir_finish_builtin_shader(struct st_context * st,nir_shader * nir)80 st_nir_finish_builtin_shader(struct st_context *st,
81 nir_shader *nir)
82 {
83 st_nir_finish_builtin_nir(st, nir);
84
85 struct pipe_shader_state state = {
86 .type = PIPE_SHADER_IR_NIR,
87 .ir.nir = nir,
88 };
89
90 return st_create_nir_shader(st, &state);
91 }
92
93 /**
94 * Make a simple vertex shader that copies inputs to corresponding outputs.
95 */
96 void *
st_nir_make_passthrough_vs(struct st_context * st,const char * shader_name,unsigned num_vars,const unsigned * input_locations,const gl_varying_slot * output_locations,unsigned sysval_mask)97 st_nir_make_passthrough_vs(struct st_context *st,
98 const char *shader_name,
99 unsigned num_vars,
100 const unsigned *input_locations,
101 const gl_varying_slot *output_locations,
102 unsigned sysval_mask)
103 {
104 const nir_shader_compiler_options *options =
105 st_get_nir_compiler_options(st, MESA_SHADER_VERTEX);
106
107 nir_builder b = nir_builder_init_simple_shader(MESA_SHADER_VERTEX, options,
108 "%s", shader_name);
109 b.shader->info.io_lowered = true;
110
111 for (unsigned i = 0; i < num_vars; i++) {
112 nir_def *in;
113
114 if (sysval_mask & (1 << i)) {
115 nir_variable *var =
116 nir_create_variable_with_location(b.shader, nir_var_system_value,
117 input_locations[i],
118 glsl_int_type());
119 in = nir_load_var(&b, var);
120 } else {
121 in = nir_load_input(&b, 4, 32, nir_imm_int(&b, 0),
122 .io_semantics.location = input_locations[i]);
123 }
124
125 nir_store_output(&b, in, nir_imm_int(&b, 0),
126 .src_type = output_locations[i] == VARYING_SLOT_LAYER ?
127 nir_type_int32 : nir_type_float32,
128 .io_semantics.location = output_locations[i]);
129 }
130
131 return st_nir_finish_builtin_shader(st, b.shader);
132 }
133
134 /**
135 * Make a simple shader that reads color value from a constant buffer
136 * and uses it to clear all color buffers.
137 */
138 void *
st_nir_make_clearcolor_shader(struct st_context * st)139 st_nir_make_clearcolor_shader(struct st_context *st)
140 {
141 const nir_shader_compiler_options *options =
142 st_get_nir_compiler_options(st, MESA_SHADER_FRAGMENT);
143
144 nir_builder b = nir_builder_init_simple_shader(MESA_SHADER_FRAGMENT, options,
145 "clear color FS");
146 b.shader->info.num_ubos = 1;
147 b.shader->num_outputs = 1;
148 b.shader->num_uniforms = 1;
149 b.shader->info.io_lowered = true;
150
151 /* Read clear color from constant buffer */
152 nir_def *clear_color = nir_load_uniform(&b, 4, 32, nir_imm_int(&b,0),
153 .range = 16,
154 .dest_type = nir_type_float32);
155
156 nir_store_output(&b, clear_color, nir_imm_int(&b, 0),
157 .io_semantics.location = FRAG_RESULT_COLOR);
158
159 return st_nir_finish_builtin_shader(st, b.shader);
160 }
161