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 "tgsi/tgsi_from_mesa.h"
24 #include "st_nir.h"
25
26 #include "compiler/nir/nir_builder.h"
27 #include "compiler/glsl/gl_nir.h"
28 #include "nir/nir_to_tgsi.h"
29 #include "tgsi/tgsi_parse.h"
30
31 struct pipe_shader_state *
st_nir_finish_builtin_shader(struct st_context * st,nir_shader * nir,const char * name)32 st_nir_finish_builtin_shader(struct st_context *st,
33 nir_shader *nir,
34 const char *name)
35 {
36 struct pipe_context *pipe = st->pipe;
37 struct pipe_screen *screen = pipe->screen;
38 gl_shader_stage stage = nir->info.stage;
39 enum pipe_shader_type sh = pipe_shader_type_from_mesa(stage);
40
41 nir->info.name = ralloc_strdup(nir, name);
42 nir->info.separate_shader = true;
43 if (stage == MESA_SHADER_FRAGMENT)
44 nir->info.fs.untyped_color_outputs = true;
45
46 NIR_PASS_V(nir, nir_lower_global_vars_to_local);
47 NIR_PASS_V(nir, nir_split_var_copies);
48 NIR_PASS_V(nir, nir_lower_var_copies);
49 NIR_PASS_V(nir, nir_lower_system_values);
50 NIR_PASS_V(nir, nir_lower_compute_system_values, NULL);
51
52 if (nir->options->lower_to_scalar) {
53 nir_variable_mode mask =
54 (stage > MESA_SHADER_VERTEX ? nir_var_shader_in : 0) |
55 (stage < MESA_SHADER_FRAGMENT ? nir_var_shader_out : 0);
56
57 NIR_PASS_V(nir, nir_lower_io_to_scalar_early, mask);
58 }
59
60 nir_shader_gather_info(nir, nir_shader_get_entrypoint(nir));
61
62 st_nir_assign_vs_in_locations(nir);
63 st_nir_assign_varying_locations(st, nir);
64
65 st_nir_lower_samplers(screen, nir, NULL, NULL);
66 st_nir_lower_uniforms(st, nir);
67 if (!screen->get_param(screen, PIPE_CAP_NIR_IMAGES_AS_DEREF))
68 NIR_PASS_V(nir, gl_nir_lower_images, false);
69
70 if (screen->finalize_nir)
71 screen->finalize_nir(screen, nir, true);
72 else
73 st_nir_opts(nir);
74
75 struct pipe_shader_state state = {
76 .type = PIPE_SHADER_IR_NIR,
77 .ir.nir = nir,
78 };
79
80 if (PIPE_SHADER_IR_NIR !=
81 screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_PREFERRED_IR)) {
82 state.type = PIPE_SHADER_IR_TGSI;
83 state.tokens = nir_to_tgsi(nir, screen);
84 ralloc_free(nir);
85 }
86
87 struct pipe_shader_state *shader;
88 switch (stage) {
89 case MESA_SHADER_VERTEX:
90 shader = pipe->create_vs_state(pipe, &state);
91 break;
92 case MESA_SHADER_TESS_CTRL:
93 shader = pipe->create_tcs_state(pipe, &state);
94 break;
95 case MESA_SHADER_TESS_EVAL:
96 shader = pipe->create_tes_state(pipe, &state);
97 break;
98 case MESA_SHADER_GEOMETRY:
99 shader = pipe->create_gs_state(pipe, &state);
100 break;
101 case MESA_SHADER_FRAGMENT:
102 shader = pipe->create_fs_state(pipe, &state);
103 break;
104 default:
105 unreachable("unsupported shader stage");
106 return NULL;
107 }
108
109 if (state.type == PIPE_SHADER_IR_TGSI)
110 tgsi_free_tokens(state.tokens);
111
112 return shader;
113 }
114
115 /**
116 * Make a simple shader that copies inputs to corresponding outputs.
117 */
118 struct pipe_shader_state *
st_nir_make_passthrough_shader(struct st_context * st,const char * shader_name,gl_shader_stage stage,unsigned num_vars,unsigned * input_locations,unsigned * output_locations,unsigned * interpolation_modes,unsigned sysval_mask)119 st_nir_make_passthrough_shader(struct st_context *st,
120 const char *shader_name,
121 gl_shader_stage stage,
122 unsigned num_vars,
123 unsigned *input_locations,
124 unsigned *output_locations,
125 unsigned *interpolation_modes,
126 unsigned sysval_mask)
127 {
128 struct nir_builder b;
129 const struct glsl_type *vec4 = glsl_vec4_type();
130 const nir_shader_compiler_options *options =
131 st_get_nir_compiler_options(st, stage);
132
133 nir_builder_init_simple_shader(&b, NULL, stage, options);
134
135 char var_name[15];
136
137 for (unsigned i = 0; i < num_vars; i++) {
138 nir_variable *in;
139 if (sysval_mask & (1 << i)) {
140 snprintf(var_name, sizeof(var_name), "sys_%u", input_locations[i]);
141 in = nir_variable_create(b.shader, nir_var_system_value,
142 glsl_int_type(), var_name);
143 } else {
144 snprintf(var_name, sizeof(var_name), "in_%u", input_locations[i]);
145 in = nir_variable_create(b.shader, nir_var_shader_in, vec4, var_name);
146 }
147 in->data.location = input_locations[i];
148 if (interpolation_modes)
149 in->data.interpolation = interpolation_modes[i];
150
151 snprintf(var_name, sizeof(var_name), "out_%u", output_locations[i]);
152 nir_variable *out =
153 nir_variable_create(b.shader, nir_var_shader_out, in->type, var_name);
154 out->data.location = output_locations[i];
155 out->data.interpolation = in->data.interpolation;
156
157 nir_copy_var(&b, out, in);
158 }
159
160 return st_nir_finish_builtin_shader(st, b.shader, shader_name);
161 }
162