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1 /*
2  * Copyright © 2016-2018 Broadcom
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 (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
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 DEALINGS
21  * IN THE SOFTWARE.
22  */
23 
24 #include "v3d_compiler.h"
25 
26 /* We don't do any address packing. */
27 #define __gen_user_data void
28 #define __gen_address_type uint32_t
29 #define __gen_address_offset(reloc) (*reloc)
30 #define __gen_emit_reloc(cl, reloc)
31 #include "cle/v3d_packet_v33_pack.h"
32 
33 void
v3d33_vir_emit_tex(struct v3d_compile * c,nir_tex_instr * instr)34 v3d33_vir_emit_tex(struct v3d_compile *c, nir_tex_instr *instr)
35 {
36         unsigned unit = instr->texture_index;
37 
38         struct V3D33_TEXTURE_UNIFORM_PARAMETER_0_CFG_MODE1 p0_unpacked = {
39                 V3D33_TEXTURE_UNIFORM_PARAMETER_0_CFG_MODE1_header,
40 
41                 .fetch_sample_mode = instr->op == nir_texop_txf,
42         };
43 
44         struct V3D33_TEXTURE_UNIFORM_PARAMETER_1_CFG_MODE1 p1_unpacked = {
45         };
46 
47         switch (instr->sampler_dim) {
48         case GLSL_SAMPLER_DIM_1D:
49                 if (instr->is_array)
50                         p0_unpacked.lookup_type = TEXTURE_1D_ARRAY;
51                 else
52                         p0_unpacked.lookup_type = TEXTURE_1D;
53                 break;
54         case GLSL_SAMPLER_DIM_2D:
55         case GLSL_SAMPLER_DIM_RECT:
56                 if (instr->is_array)
57                         p0_unpacked.lookup_type = TEXTURE_2D_ARRAY;
58                 else
59                         p0_unpacked.lookup_type = TEXTURE_2D;
60                 break;
61         case GLSL_SAMPLER_DIM_3D:
62                 p0_unpacked.lookup_type = TEXTURE_3D;
63                 break;
64         case GLSL_SAMPLER_DIM_CUBE:
65                 p0_unpacked.lookup_type = TEXTURE_CUBE_MAP;
66                 break;
67         default:
68                 unreachable("Bad sampler type");
69         }
70 
71         struct qreg coords[5];
72         int next_coord = 0;
73         for (unsigned i = 0; i < instr->num_srcs; i++) {
74                 switch (instr->src[i].src_type) {
75                 case nir_tex_src_coord:
76                         for (int j = 0; j < instr->coord_components; j++) {
77                                 coords[next_coord++] =
78                                         ntq_get_src(c, instr->src[i].src, j);
79                         }
80                         if (instr->coord_components < 2)
81                                 coords[next_coord++] = vir_uniform_f(c, 0.5);
82                         break;
83                 case nir_tex_src_bias:
84                         coords[next_coord++] =
85                                 ntq_get_src(c, instr->src[i].src, 0);
86 
87                         p0_unpacked.bias_supplied = true;
88                         break;
89                 case nir_tex_src_lod:
90                         coords[next_coord++] =
91                                 vir_FADD(c,
92                                          ntq_get_src(c, instr->src[i].src, 0),
93                                          vir_uniform(c, QUNIFORM_TEXTURE_FIRST_LEVEL,
94                                                      unit));
95 
96                         if (instr->op != nir_texop_txf &&
97                             instr->op != nir_texop_tg4) {
98                                 p0_unpacked.disable_autolod_use_bias_only = true;
99                         }
100                         break;
101                 case nir_tex_src_comparator:
102                         coords[next_coord++] =
103                                 ntq_get_src(c, instr->src[i].src, 0);
104 
105                         p0_unpacked.shadow = true;
106                         break;
107 
108                 case nir_tex_src_offset: {
109                         p0_unpacked.texel_offset_for_s_coordinate =
110                                 nir_src_comp_as_int(instr->src[i].src, 0);
111 
112                         if (instr->coord_components >= 2)
113                                 p0_unpacked.texel_offset_for_t_coordinate =
114                                         nir_src_comp_as_int(instr->src[i].src, 1);
115 
116                         if (instr->coord_components >= 3)
117                                 p0_unpacked.texel_offset_for_r_coordinate =
118                                         nir_src_comp_as_int(instr->src[i].src, 2);
119                         break;
120                 }
121 
122                 default:
123                         unreachable("unknown texture source");
124                 }
125         }
126 
127         /* Limit the number of channels returned to both how many the NIR
128          * instruction writes and how many the instruction could produce.
129          */
130         p1_unpacked.return_words_of_texture_data =
131                 instr->dest.is_ssa ?
132                 nir_ssa_def_components_read(&instr->dest.ssa) :
133                 (1 << instr->dest.reg.reg->num_components) - 1;
134 
135         uint32_t p0_packed;
136         V3D33_TEXTURE_UNIFORM_PARAMETER_0_CFG_MODE1_pack(NULL,
137                                                          (uint8_t *)&p0_packed,
138                                                          &p0_unpacked);
139 
140         uint32_t p1_packed;
141         V3D33_TEXTURE_UNIFORM_PARAMETER_1_CFG_MODE1_pack(NULL,
142                                                          (uint8_t *)&p1_packed,
143                                                          &p1_unpacked);
144         /* Load unit number into the address field, which will be be used by
145          * the driver to decide which texture to put in the actual address
146          * field.
147          */
148         p1_packed |= unit << 5;
149 
150         /* There is no native support for GL texture rectangle coordinates, so
151          * we have to rescale from ([0, width], [0, height]) to ([0, 1], [0,
152          * 1]).
153          */
154         if (instr->sampler_dim == GLSL_SAMPLER_DIM_RECT) {
155                 coords[0] = vir_FMUL(c, coords[0],
156                                      vir_uniform(c, QUNIFORM_TEXRECT_SCALE_X,
157                                                  unit));
158                 coords[1] = vir_FMUL(c, coords[1],
159                                      vir_uniform(c, QUNIFORM_TEXRECT_SCALE_Y,
160                                                  unit));
161         }
162 
163         int texture_u[] = {
164                 vir_get_uniform_index(c, QUNIFORM_TEXTURE_CONFIG_P0_0 + unit, p0_packed),
165                 vir_get_uniform_index(c, QUNIFORM_TEXTURE_CONFIG_P1, p1_packed),
166         };
167 
168         for (int i = 0; i < next_coord; i++) {
169                 struct qreg dst;
170 
171                 if (i == next_coord - 1)
172                         dst = vir_reg(QFILE_MAGIC, V3D_QPU_WADDR_TMUL);
173                 else
174                         dst = vir_reg(QFILE_MAGIC, V3D_QPU_WADDR_TMU);
175 
176                 struct qinst *tmu = vir_MOV_dest(c, dst, coords[i]);
177 
178                 if (i < 2)
179                         tmu->uniform = texture_u[i];
180         }
181 
182         vir_emit_thrsw(c);
183 
184         for (int i = 0; i < 4; i++) {
185                 if (p1_unpacked.return_words_of_texture_data & (1 << i))
186                         ntq_store_dest(c, &instr->dest, i, vir_LDTMU(c));
187         }
188 }
189