1 /*
2 * Copyright (c) 2019 Zodiac Inflight Innovations
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, sub license,
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 (including the
12 * next paragraph) shall be included in all copies or substantial portions
13 * of the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Jonathan Marek <jonathan@marek.ca>
25 */
26
27 #include "etnaviv_nir.h"
28
29 /* io related lowering
30 * run after lower_int_to_float because it adds i2f/f2i ops
31 */
32 void
etna_lower_io(nir_shader * shader,struct etna_shader_variant * v)33 etna_lower_io(nir_shader *shader, struct etna_shader_variant *v)
34 {
35 nir_foreach_function(function, shader) {
36 nir_builder b;
37 nir_builder_init(&b, function->impl);
38
39 nir_foreach_block(block, function->impl) {
40 nir_foreach_instr_safe(instr, block) {
41 if (instr->type == nir_instr_type_intrinsic) {
42 nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
43
44 switch (intr->intrinsic) {
45 case nir_intrinsic_load_front_face: {
46 /* HW front_face is 0.0/1.0, not 0/~0u for bool
47 * lower with a comparison with 0
48 */
49 intr->dest.ssa.bit_size = 32;
50
51 b.cursor = nir_after_instr(instr);
52
53 nir_ssa_def *ssa = nir_ine(&b, &intr->dest.ssa, nir_imm_int(&b, 0));
54 if (v->key.front_ccw)
55 nir_instr_as_alu(ssa->parent_instr)->op = nir_op_ieq;
56
57 nir_ssa_def_rewrite_uses_after(&intr->dest.ssa,
58 ssa,
59 ssa->parent_instr);
60 } break;
61 case nir_intrinsic_store_deref: {
62 nir_deref_instr *deref = nir_src_as_deref(intr->src[0]);
63 if (shader->info.stage != MESA_SHADER_FRAGMENT || !v->key.frag_rb_swap)
64 break;
65
66 assert(deref->deref_type == nir_deref_type_var);
67
68 if (deref->var->data.location != FRAG_RESULT_COLOR &&
69 deref->var->data.location != FRAG_RESULT_DATA0)
70 break;
71
72 b.cursor = nir_before_instr(instr);
73
74 nir_ssa_def *ssa = nir_mov(&b, intr->src[1].ssa);
75 nir_alu_instr *alu = nir_instr_as_alu(ssa->parent_instr);
76 alu->src[0].swizzle[0] = 2;
77 alu->src[0].swizzle[2] = 0;
78 nir_instr_rewrite_src(instr, &intr->src[1], nir_src_for_ssa(ssa));
79 } break;
80 case nir_intrinsic_load_vertex_id:
81 case nir_intrinsic_load_instance_id:
82 /* detect use of vertex_id/instance_id */
83 v->vs_id_in_reg = v->infile.num_reg;
84 break;
85 default:
86 break;
87 }
88 }
89
90 if (instr->type != nir_instr_type_tex)
91 continue;
92
93 nir_tex_instr *tex = nir_instr_as_tex(instr);
94 nir_src *coord = NULL;
95 nir_src *lod_bias = NULL;
96 unsigned lod_bias_idx;
97
98 assert(tex->sampler_index == tex->texture_index);
99
100 for (unsigned i = 0; i < tex->num_srcs; i++) {
101 switch (tex->src[i].src_type) {
102 case nir_tex_src_coord:
103 coord = &tex->src[i].src;
104 break;
105 case nir_tex_src_bias:
106 case nir_tex_src_lod:
107 assert(!lod_bias);
108 lod_bias = &tex->src[i].src;
109 lod_bias_idx = i;
110 break;
111 case nir_tex_src_comparator:
112 break;
113 default:
114 assert(0);
115 break;
116 }
117 }
118
119 /* pre HALTI5 needs texture sources in a single source */
120
121 if (!lod_bias || v->shader->specs->halti >= 5)
122 continue;
123
124 assert(coord && lod_bias && tex->coord_components < 4);
125
126 nir_alu_instr *vec = nir_alu_instr_create(shader, nir_op_vec4);
127 for (unsigned i = 0; i < tex->coord_components; i++) {
128 vec->src[i].src = nir_src_for_ssa(coord->ssa);
129 vec->src[i].swizzle[0] = i;
130 }
131 for (unsigned i = tex->coord_components; i < 4; i++)
132 vec->src[i].src = nir_src_for_ssa(lod_bias->ssa);
133
134 vec->dest.write_mask = 0xf;
135 nir_ssa_dest_init(&vec->instr, &vec->dest.dest, 4, 32, NULL);
136
137 nir_tex_instr_remove_src(tex, lod_bias_idx);
138 nir_instr_rewrite_src(&tex->instr, coord, nir_src_for_ssa(&vec->dest.dest.ssa));
139 tex->coord_components = 4;
140
141 nir_instr_insert_before(&tex->instr, &vec->instr);
142 }
143 }
144 }
145 }
146
147 static void
etna_lower_alu_impl(nir_function_impl * impl,bool has_new_transcendentals)148 etna_lower_alu_impl(nir_function_impl *impl, bool has_new_transcendentals)
149 {
150 nir_shader *shader = impl->function->shader;
151
152 nir_builder b;
153 nir_builder_init(&b, impl);
154
155 /* in a seperate loop so we can apply the multiple-uniform logic to the new fmul */
156 nir_foreach_block(block, impl) {
157 nir_foreach_instr_safe(instr, block) {
158 if (instr->type != nir_instr_type_alu)
159 continue;
160
161 nir_alu_instr *alu = nir_instr_as_alu(instr);
162 /* multiply sin/cos src by constant
163 * TODO: do this earlier (but it breaks const_prop opt)
164 */
165 if (alu->op == nir_op_fsin || alu->op == nir_op_fcos) {
166 b.cursor = nir_before_instr(instr);
167
168 nir_ssa_def *imm = has_new_transcendentals ?
169 nir_imm_float(&b, 1.0 / M_PI) :
170 nir_imm_float(&b, 2.0 / M_PI);
171
172 nir_instr_rewrite_src(instr, &alu->src[0].src,
173 nir_src_for_ssa(nir_fmul(&b, alu->src[0].src.ssa, imm)));
174 }
175
176 /* change transcendental ops to vec2 and insert vec1 mul for the result
177 * TODO: do this earlier (but it breaks with optimizations)
178 */
179 if (has_new_transcendentals && (
180 alu->op == nir_op_fdiv || alu->op == nir_op_flog2 ||
181 alu->op == nir_op_fsin || alu->op == nir_op_fcos)) {
182 nir_ssa_def *ssa = &alu->dest.dest.ssa;
183
184 assert(ssa->num_components == 1);
185
186 nir_alu_instr *mul = nir_alu_instr_create(shader, nir_op_fmul);
187 mul->src[0].src = mul->src[1].src = nir_src_for_ssa(ssa);
188 mul->src[1].swizzle[0] = 1;
189
190 mul->dest.write_mask = 1;
191 nir_ssa_dest_init(&mul->instr, &mul->dest.dest, 1, 32, NULL);
192
193 ssa->num_components = 2;
194
195 mul->dest.saturate = alu->dest.saturate;
196 alu->dest.saturate = 0;
197
198 nir_instr_insert_after(instr, &mul->instr);
199
200 nir_ssa_def_rewrite_uses_after(ssa, &mul->dest.dest.ssa,
201 &mul->instr);
202 }
203 }
204 }
205 }
206
207 void
etna_lower_alu(nir_shader * shader,bool has_new_transcendentals)208 etna_lower_alu(nir_shader *shader, bool has_new_transcendentals)
209 {
210 nir_foreach_function(function, shader) {
211 if (function->impl)
212 etna_lower_alu_impl(function->impl, has_new_transcendentals);
213 }
214 }
215