workbench/libs/mesa/src/gallium/auxiliary/tgsi/tgsi_util.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "util/u_debug.h"
  29 #include "pipe/p_shader_tokens.h"
  30 #include "tgsi_parse.h"
  31 #include "tgsi_util.h"
  32
  33 union pointer_hack
  34 {
  35    void *pointer;
  36    uint64_t uint64;
  37 };
  38
  39 void *
  40 tgsi_align_128bit(
  41    void *unaligned )
  42 {
  43    union pointer_hack ph;
  44
  45    ph.uint64 = 0;
  46    ph.pointer = unaligned;
  47    ph.uint64 = (ph.uint64 + 15) & ~15;
  48    return ph.pointer;
  49 }
  50
  51 unsigned
  52 tgsi_util_get_src_register_swizzle(
  53    const struct tgsi_src_register *reg,
  54    unsigned component )
  55 {
  56    switch( component ) {
  57    case 0:
  58       return reg->SwizzleX;
  59    case 1:
  60       return reg->SwizzleY;
  61    case 2:
  62       return reg->SwizzleZ;
  63    case 3:
  64       return reg->SwizzleW;
  65    default:
  66       assert( 0 );
  67    }
  68    return 0;
  69 }
  70
  71
  72 unsigned
  73 tgsi_util_get_full_src_register_swizzle(
  74    const struct tgsi_full_src_register  *reg,
  75    unsigned component )
  76 {
  77    return tgsi_util_get_src_register_swizzle(
  78       &reg->Register,
  79       component );
  80 }
  81
  82 void
  83 tgsi_util_set_src_register_swizzle(
  84    struct tgsi_src_register *reg,
  85    unsigned swizzle,
  86    unsigned component )
  87 {
  88    switch( component ) {
  89    case 0:
  90       reg->SwizzleX = swizzle;
  91       break;
  92    case 1:
  93       reg->SwizzleY = swizzle;
  94       break;
  95    case 2:
  96       reg->SwizzleZ = swizzle;
  97       break;
  98    case 3:
  99       reg->SwizzleW = swizzle;
 100       break;
 101    default:
 102       assert( 0 );
 103    }
 104 }
 105
 106 unsigned
 107 tgsi_util_get_full_src_register_sign_mode(
 108    const struct  tgsi_full_src_register *reg,
 109    unsigned component )
 110 {
 111    unsigned sign_mode;
 112
 113    if( reg->Register.Absolute ) {
 114       /* Consider only the post-abs negation. */
 115
 116       if( reg->Register.Negate ) {
 117          sign_mode = TGSI_UTIL_SIGN_SET;
 118       }
 119       else {
 120          sign_mode = TGSI_UTIL_SIGN_CLEAR;
 121       }
 122    }
 123    else {
 124       if( reg->Register.Negate ) {
 125          sign_mode = TGSI_UTIL_SIGN_TOGGLE;
 126       }
 127       else {
 128          sign_mode = TGSI_UTIL_SIGN_KEEP;
 129       }
 130    }
 131
 132    return sign_mode;
 133 }
 134
 135 void
 136 tgsi_util_set_full_src_register_sign_mode(
 137    struct tgsi_full_src_register *reg,
 138    unsigned sign_mode )
 139 {
 140    switch (sign_mode)
 141    {
 142    case TGSI_UTIL_SIGN_CLEAR:
 143       reg->Register.Negate = 0;
 144       reg->Register.Absolute = 1;
 145       break;
 146
 147    case TGSI_UTIL_SIGN_SET:
 148       reg->Register.Absolute = 1;
 149       reg->Register.Negate = 1;
 150       break;
 151
 152    case TGSI_UTIL_SIGN_TOGGLE:
 153       reg->Register.Negate = 1;
 154       reg->Register.Absolute = 0;
 155       break;
 156
 157    case TGSI_UTIL_SIGN_KEEP:
 158       reg->Register.Negate = 0;
 159       reg->Register.Absolute = 0;
 160       break;
 161
 162    default:
 163       assert( 0 );
 164    }
 165 }
 166
 167 /**
 168  * Determine which channels of the specificed src register are effectively
 169  * used by this instruction.
 170  */
 171 unsigned
 172 tgsi_util_get_inst_usage_mask(const struct tgsi_full_instruction *inst,
 173                               unsigned src_idx)
 174 {
 175    const struct tgsi_full_src_register *src = &inst->Src[src_idx];
 176    unsigned write_mask = inst->Dst[0].Register.WriteMask;
 177    unsigned read_mask;
 178    unsigned usage_mask;
 179    unsigned chan;
 180
 181    switch (inst->Instruction.Opcode) {
 182    case TGSI_OPCODE_MOV:
 183    case TGSI_OPCODE_ARL:
 184    case TGSI_OPCODE_ARR:
 185    case TGSI_OPCODE_RCP:
 186    case TGSI_OPCODE_MUL:
 187    case TGSI_OPCODE_DIV:
 188    case TGSI_OPCODE_ADD:
 189    case TGSI_OPCODE_MIN:
 190    case TGSI_OPCODE_MAX:
 191    case TGSI_OPCODE_SLT:
 192    case TGSI_OPCODE_SGE:
 193    case TGSI_OPCODE_MAD:
 194    case TGSI_OPCODE_SUB:
 195    case TGSI_OPCODE_LRP:
 196    case TGSI_OPCODE_CND:
 197    case TGSI_OPCODE_FRC:
 198    case TGSI_OPCODE_CEIL:
 199    case TGSI_OPCODE_CLAMP:
 200    case TGSI_OPCODE_FLR:
 201    case TGSI_OPCODE_ROUND:
 202    case TGSI_OPCODE_POW:
 203    case TGSI_OPCODE_ABS:
 204    case TGSI_OPCODE_COS:
 205    case TGSI_OPCODE_SIN:
 206    case TGSI_OPCODE_DDX:
 207    case TGSI_OPCODE_DDY:
 208    case TGSI_OPCODE_SEQ:
 209    case TGSI_OPCODE_SGT:
 210    case TGSI_OPCODE_SLE:
 211    case TGSI_OPCODE_SNE:
 212    case TGSI_OPCODE_SSG:
 213    case TGSI_OPCODE_CMP:
 214    case TGSI_OPCODE_TRUNC:
 215    case TGSI_OPCODE_NOT:
 216    case TGSI_OPCODE_AND:
 217    case TGSI_OPCODE_OR:
 218    case TGSI_OPCODE_XOR:
 219    case TGSI_OPCODE_SAD:
 220       /* Channel-wise operations */
 221       read_mask = write_mask;
 222       break;
 223
 224    case TGSI_OPCODE_EX2:
 225    case TGSI_OPCODE_LG2:
 226    case TGSI_OPCODE_RCC:
 227       read_mask = TGSI_WRITEMASK_X;
 228       break;
 229
 230    case TGSI_OPCODE_SCS:
 231       read_mask = write_mask & TGSI_WRITEMASK_XY ? TGSI_WRITEMASK_X : 0;
 232       break;
 233
 234    case TGSI_OPCODE_EXP:
 235    case TGSI_OPCODE_LOG:
 236       read_mask = write_mask & TGSI_WRITEMASK_XYZ ? TGSI_WRITEMASK_X : 0;
 237       break;
 238
 239    case TGSI_OPCODE_DP2A:
 240       read_mask = src_idx == 2 ? TGSI_WRITEMASK_X : TGSI_WRITEMASK_XY;
 241       break;
 242
 243    case TGSI_OPCODE_DP2:
 244       read_mask = TGSI_WRITEMASK_XY;
 245       break;
 246
 247    case TGSI_OPCODE_DP3:
 248       read_mask = TGSI_WRITEMASK_XYZ;
 249       break;
 250
 251    case TGSI_OPCODE_DP4:
 252       read_mask = TGSI_WRITEMASK_XYZW;
 253       break;
 254
 255    case TGSI_OPCODE_DPH:
 256       read_mask = src_idx == 0 ? TGSI_WRITEMASK_XYZ : TGSI_WRITEMASK_XYZW;
 257       break;
 258
 259    case TGSI_OPCODE_TEX:
 260    case TGSI_OPCODE_TXD:
 261    case TGSI_OPCODE_TXB:
 262    case TGSI_OPCODE_TXL:
 263    case TGSI_OPCODE_TXP:
 264       if (src_idx == 0) {
 265          /* Note that the SHADOW variants use the Z component too */
 266          switch (inst->Texture.Texture) {
 267          case TGSI_TEXTURE_1D:
 268             read_mask = TGSI_WRITEMASK_X;
 269             break;
 270          case TGSI_TEXTURE_SHADOW1D:
 271             read_mask = TGSI_WRITEMASK_XZ;
 272             break;
 273          case TGSI_TEXTURE_2D:
 274          case TGSI_TEXTURE_RECT:
 275             read_mask = TGSI_WRITEMASK_XY;
 276             break;
 277          case TGSI_TEXTURE_SHADOW2D:
 278          case TGSI_TEXTURE_SHADOWRECT:
 279          case TGSI_TEXTURE_3D:
 280          case TGSI_TEXTURE_CUBE:
 281             read_mask = TGSI_WRITEMASK_XYZ;
 282             break;
 283          case TGSI_TEXTURE_1D_ARRAY:
 284             read_mask = TGSI_WRITEMASK_XY;
 285             break;
 286          case TGSI_TEXTURE_2D_ARRAY:
 287             read_mask = TGSI_WRITEMASK_XYZ;
 288             break;
 289          default:
 290             assert(0);
 291             read_mask = 0;
 292          }
 293
 294          if (inst->Instruction.Opcode != TGSI_OPCODE_TEX) {
 295             read_mask |= TGSI_WRITEMASK_W;
 296          }
 297       } else {
 298          /* A safe approximation */
 299          read_mask = TGSI_WRITEMASK_XYZW;
 300       }
 301       break;
 302
 303    default:
 304       /* Assume all channels are read */
 305       read_mask = TGSI_WRITEMASK_XYZW;
 306       break;
 307    }
 308
 309    usage_mask = 0;
 310    for (chan = 0; chan < 4; ++chan) {
 311       if (read_mask & (1 << chan)) {
 312          usage_mask |= 1 << tgsi_util_get_full_src_register_swizzle(src, chan);
 313       }
 314    }
 315
 316    return usage_mask;
 317 }