src/broadcom/compiler/v3d40_tex.c

   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_v41_pack.h"
  32
  33 static void
  34 vir_TMU_WRITE(struct v3d_compile *c, enum v3d_qpu_waddr waddr, struct qreg val,
  35               int *tmu_writes)
  36 {
  37         /* XXX perf: We should figure out how to merge ALU operations
  38          * producing the val with this MOV, when possible.
  39          */
  40         vir_MOV_dest(c, vir_reg(QFILE_MAGIC, waddr), val);
  41
  42         (*tmu_writes)++;
  43 }
  44
  45 static void
  46 vir_WRTMUC(struct v3d_compile *c, enum quniform_contents contents, uint32_t data)
  47 {
  48         struct qinst *inst = vir_NOP(c);
  49         inst->qpu.sig.wrtmuc = true;
  50         inst->has_implicit_uniform = true;
  51         inst->src[0] = vir_uniform(c, contents, data);
  52 }
  53
  54 void
  55 v3d40_vir_emit_tex(struct v3d_compile *c, nir_tex_instr *instr)
  56 {
  57         unsigned unit = instr->texture_index;
  58         int tmu_writes = 0;
  59         static const struct V3D41_TMU_CONFIG_PARAMETER_2 p2_unpacked_default = {
  60                 .op = V3D_TMU_OP_REGULAR,
  61         };
  62
  63         struct V3D41_TMU_CONFIG_PARAMETER_0 p0_unpacked = {
  64         };
  65
  66         struct V3D41_TMU_CONFIG_PARAMETER_1 p1_unpacked = {
  67                 .output_type_32_bit = (c->key->tex[unit].return_size == 32 &&
  68                                        !instr->is_shadow),
  69
  70                 .unnormalized_coordinates = (instr->sampler_dim ==
  71                                              GLSL_SAMPLER_DIM_RECT),
  72         };
  73
  74         struct V3D41_TMU_CONFIG_PARAMETER_2 p2_unpacked = {
  75                 .op = V3D_TMU_OP_REGULAR,
  76
  77                 .gather_mode = instr->op == nir_texop_tg4,
  78                 .gather_component = instr->component,
  79
  80                 .coefficient_mode = instr->op == nir_texop_txd,
  81         };
  82
  83         int non_array_components = instr->coord_components - instr->is_array;
  84         struct qreg s;
  85
  86         for (unsigned i = 0; i < instr->num_srcs; i++) {
  87                 switch (instr->src[i].src_type) {
  88                 case nir_tex_src_coord:
  89                         /* S triggers the lookup, so save it for the end. */
  90                         s = ntq_get_src(c, instr->src[i].src, 0);
  91
  92                         if (non_array_components > 1) {
  93                                 vir_TMU_WRITE(c, V3D_QPU_WADDR_TMUT,
  94                                               ntq_get_src(c, instr->src[i].src,
  95                                                           1), &tmu_writes);
  96                         }
  97                         if (non_array_components > 2) {
  98                                 vir_TMU_WRITE(c, V3D_QPU_WADDR_TMUR,
  99                                               ntq_get_src(c, instr->src[i].src,
 100                                                           2), &tmu_writes);
 101                         }
 102
 103                         if (instr->is_array) {
 104                                 vir_TMU_WRITE(c, V3D_QPU_WADDR_TMUI,
 105                                               ntq_get_src(c, instr->src[i].src,
 106                                                           instr->coord_components - 1),
 107                                               &tmu_writes);
 108                         }
 109                         break;
 110
 111                 case nir_tex_src_bias:
 112                         vir_TMU_WRITE(c, V3D_QPU_WADDR_TMUB,
 113                                       ntq_get_src(c, instr->src[i].src, 0),
 114                                       &tmu_writes);
 115                         break;
 116
 117                 case nir_tex_src_lod:
 118                         vir_TMU_WRITE(c, V3D_QPU_WADDR_TMUB,
 119                                       ntq_get_src(c, instr->src[i].src, 0),
 120                                       &tmu_writes);
 121
 122                         if (instr->op != nir_texop_txf &&
 123                             instr->op != nir_texop_tg4) {
 124                                 p2_unpacked.disable_autolod = true;
 125                         }
 126                         break;
 127
 128                 case nir_tex_src_comparator:
 129                         vir_TMU_WRITE(c, V3D_QPU_WADDR_TMUDREF,
 130                                       ntq_get_src(c, instr->src[i].src, 0),
 131                                       &tmu_writes);
 132                         break;
 133
 134                 case nir_tex_src_offset: {
 135                         nir_const_value *offset =
 136                                 nir_src_as_const_value(instr->src[i].src);
 137
 138                         p2_unpacked.offset_s = offset->i32[0];
 139                         if (instr->coord_components >= 2)
 140                                 p2_unpacked.offset_t = offset->i32[1];
 141                         if (instr->coord_components >= 3)
 142                                 p2_unpacked.offset_r = offset->i32[2];
 143                         break;
 144                 }
 145
 146                 default:
 147                         unreachable("unknown texture source");
 148                 }
 149         }
 150
 151         /* Limit the number of channels returned to both how many the NIR
 152          * instruction writes and how many the instruction could produce.
 153          *
 154          * XXX perf: Can we also limit to the number of channels that are
 155          * actually read by the users of this NIR dest, so that we don't need
 156          * to emit unused LDTMUs?
 157          */
 158         uint32_t instr_return_channels = nir_tex_instr_dest_size(instr);
 159         if (!p1_unpacked.output_type_32_bit)
 160                 instr_return_channels = (instr_return_channels + 1) / 2;
 161
 162         p0_unpacked.return_words_of_texture_data =
 163                 (1 << MIN2(instr_return_channels,
 164                            c->key->tex[unit].return_channels)) - 1;
 165
 166         /* Word enables can't ask for more channels than the output type could
 167          * provide (2 for f16, 4 for 32-bit).
 168          */
 169         assert(!p1_unpacked.output_type_32_bit ||
 170                p0_unpacked.return_words_of_texture_data < (1 << 4));
 171         assert(p1_unpacked.output_type_32_bit ||
 172                p0_unpacked.return_words_of_texture_data < (1 << 2));
 173
 174         uint32_t p0_packed;
 175         V3D41_TMU_CONFIG_PARAMETER_0_pack(NULL,
 176                                           (uint8_t *)&p0_packed,
 177                                           &p0_unpacked);
 178
 179         uint32_t p1_packed;
 180         V3D41_TMU_CONFIG_PARAMETER_1_pack(NULL,
 181                                           (uint8_t *)&p1_packed,
 182                                           &p1_unpacked);
 183
 184         uint32_t p2_packed;
 185         V3D41_TMU_CONFIG_PARAMETER_2_pack(NULL,
 186                                           (uint8_t *)&p2_packed,
 187                                           &p2_unpacked);
 188
 189         /* Load unit number into the high bits of the texture or sampler
 190          * address field, which will be be used by the driver to decide which
 191          * texture to put in the actual address field.
 192          */
 193         p0_packed |= unit << 24;
 194         p1_packed |= unit << 24;
 195
 196         vir_WRTMUC(c, QUNIFORM_TMU_CONFIG_P0, p0_packed);
 197         /* XXX perf: Can we skip p1 setup for txf ops? */
 198         vir_WRTMUC(c, QUNIFORM_TMU_CONFIG_P1, p1_packed);
 199         if (memcmp(&p2_unpacked, &p2_unpacked_default, sizeof(p2_unpacked)) != 0)
 200                 vir_WRTMUC(c, QUNIFORM_CONSTANT, p2_packed);
 201
 202         if (instr->op == nir_texop_txf) {
 203                 assert(instr->sampler_dim != GLSL_SAMPLER_DIM_CUBE);
 204                 vir_TMU_WRITE(c, V3D_QPU_WADDR_TMUSF, s, &tmu_writes);
 205         } else if (instr->sampler_dim == GLSL_SAMPLER_DIM_CUBE) {
 206                 vir_TMU_WRITE(c, V3D_QPU_WADDR_TMUSCM, s, &tmu_writes);
 207         } else {
 208                 vir_TMU_WRITE(c, V3D_QPU_WADDR_TMUS, s, &tmu_writes);
 209         }
 210
 211         vir_emit_thrsw(c);
 212
 213         /* The input FIFO has 16 slots across all threads, so make sure we
 214          * don't overfill our allocation.
 215          */
 216         while (tmu_writes > 16 / c->threads)
 217                 c->threads /= 2;
 218
 219         struct qreg return_values[4];
 220         for (int i = 0; i < 4; i++) {
 221                 /* Swizzling .zw of an RG texture should give undefined
 222                  * results, not crash the compiler.
 223                  */
 224                 if (p0_unpacked.return_words_of_texture_data & (1 << i))
 225                         return_values[i] = vir_LDTMU(c);
 226                 else
 227                         return_values[i] = c->undef;
 228         }
 229
 230         for (int i = 0; i < nir_tex_instr_dest_size(instr); i++) {
 231                 struct qreg chan;
 232
 233                 if (!p1_unpacked.output_type_32_bit) {
 234                         STATIC_ASSERT(PIPE_SWIZZLE_X == 0);
 235                         chan = return_values[i / 2];
 236
 237                         /* XXX perf: We should move this unpacking into NIR.
 238                          * That would give us exposure of these types to NIR
 239                          * optimization, so that (for example) a repacking of
 240                          * half-float samples to the half-float render target
 241                          * could be eliminated.
 242                          */
 243                         if (nir_alu_type_get_base_type(instr->dest_type) ==
 244                             nir_type_float) {
 245                                 enum v3d_qpu_input_unpack unpack;
 246                                 if (i & 1)
 247                                         unpack = V3D_QPU_UNPACK_H;
 248                                 else
 249                                         unpack = V3D_QPU_UNPACK_L;
 250
 251                                 chan = vir_FMOV(c, chan);
 252                                 vir_set_unpack(c->defs[chan.index], 0, unpack);
 253                         } else {
 254                                 /* If we're unpacking the low field, shift it
 255                                  * up to the top first.
 256                                  */
 257                                 if ((i & 1) == 0) {
 258                                         chan = vir_SHL(c, chan,
 259                                                        vir_uniform_ui(c, 16));
 260                                 }
 261
 262                                 /* Do proper sign extension to a 32-bit int. */
 263                                 if (nir_alu_type_get_base_type(instr->dest_type) ==
 264                                     nir_type_int) {
 265                                         chan = vir_ASR(c, chan,
 266                                                        vir_uniform_ui(c, 16));
 267                                 } else {
 268                                         chan = vir_SHR(c, chan,
 269                                                        vir_uniform_ui(c, 16));
 270                                 }
 271                         }
 272                 } else {
 273                         chan = vir_MOV(c, return_values[i]);
 274                 }
 275                 ntq_store_dest(c, &instr->dest, i, chan);
 276         }
 277 }