src/gallium/include/pipe/p_shader_tokens.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright 2009 VMware, Inc.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29 #ifndef P_SHADER_TOKENS_H
  30 #define P_SHADER_TOKENS_H
  31
  32 #ifdef __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 #include "p_compiler.h"
  37
  38 struct tgsi_version
  39 {
  40    unsigned MajorVersion  : 8;
  41    unsigned MinorVersion  : 8;
  42    unsigned Padding       : 16;
  43 };
  44
  45 struct tgsi_header
  46 {
  47    unsigned HeaderSize : 8;
  48    unsigned BodySize   : 24;
  49 };
  50
  51 #define TGSI_PROCESSOR_FRAGMENT  0
  52 #define TGSI_PROCESSOR_VERTEX    1
  53 #define TGSI_PROCESSOR_GEOMETRY  2
  54
  55 struct tgsi_processor
  56 {
  57    unsigned Processor  : 4;  /* TGSI_PROCESSOR_ */
  58    unsigned Padding    : 28;
  59 };
  60
  61 #define TGSI_TOKEN_TYPE_DECLARATION    0
  62 #define TGSI_TOKEN_TYPE_IMMEDIATE      1
  63 #define TGSI_TOKEN_TYPE_INSTRUCTION    2
  64
  65 struct tgsi_token
  66 {
  67    unsigned Type       : 4;  /**< TGSI_TOKEN_TYPE_x */
  68    unsigned NrTokens   : 8;  /**< UINT */
  69    unsigned Padding    : 19;
  70    unsigned Extended   : 1;  /**< BOOL */
  71 };
  72
  73 enum tgsi_file_type {
  74    TGSI_FILE_NULL        =0,
  75    TGSI_FILE_CONSTANT    =1,
  76    TGSI_FILE_INPUT       =2,
  77    TGSI_FILE_OUTPUT      =3,
  78    TGSI_FILE_TEMPORARY   =4,
  79    TGSI_FILE_SAMPLER     =5,
  80    TGSI_FILE_ADDRESS     =6,
  81    TGSI_FILE_IMMEDIATE   =7,
  82    TGSI_FILE_LOOP        =8,
  83    TGSI_FILE_PREDICATE   =9,
  84    TGSI_FILE_COUNT      /**< how many TGSI_FILE_ types */
  85 };
  86
  87
  88 #define TGSI_WRITEMASK_NONE     0x00
  89 #define TGSI_WRITEMASK_X        0x01
  90 #define TGSI_WRITEMASK_Y        0x02
  91 #define TGSI_WRITEMASK_XY       0x03
  92 #define TGSI_WRITEMASK_Z        0x04
  93 #define TGSI_WRITEMASK_XZ       0x05
  94 #define TGSI_WRITEMASK_YZ       0x06
  95 #define TGSI_WRITEMASK_XYZ      0x07
  96 #define TGSI_WRITEMASK_W        0x08
  97 #define TGSI_WRITEMASK_XW       0x09
  98 #define TGSI_WRITEMASK_YW       0x0A
  99 #define TGSI_WRITEMASK_XYW      0x0B
 100 #define TGSI_WRITEMASK_ZW       0x0C
 101 #define TGSI_WRITEMASK_XZW      0x0D
 102 #define TGSI_WRITEMASK_YZW      0x0E
 103 #define TGSI_WRITEMASK_XYZW     0x0F
 104
 105 #define TGSI_INTERPOLATE_CONSTANT      0
 106 #define TGSI_INTERPOLATE_LINEAR        1
 107 #define TGSI_INTERPOLATE_PERSPECTIVE   2
 108 #define TGSI_INTERPOLATE_COUNT         3
 109
 110 struct tgsi_declaration
 111 {
 112    unsigned Type        : 4;  /**< TGSI_TOKEN_TYPE_DECLARATION */
 113    unsigned NrTokens    : 8;  /**< UINT */
 114    unsigned File        : 4;  /**< one of TGSI_FILE_x */
 115    unsigned UsageMask   : 4;  /**< bitmask of TGSI_WRITEMASK_x flags */
 116    unsigned Interpolate : 4;  /**< one of TGSI_INTERPOLATE_x */
 117    unsigned Semantic    : 1;  /**< BOOL, any semantic info? */
 118    unsigned Centroid    : 1;  /**< centroid sampling? */
 119    unsigned Invariant   : 1;  /**< invariant optimization? */
 120    unsigned Padding     : 4;
 121    unsigned Extended    : 1;  /**< BOOL */
 122 };
 123
 124 struct tgsi_declaration_range
 125 {
 126    unsigned First   : 16; /**< UINT */
 127    unsigned Last    : 16; /**< UINT */
 128 };
 129
 130 #define TGSI_SEMANTIC_POSITION 0
 131 #define TGSI_SEMANTIC_COLOR    1
 132 #define TGSI_SEMANTIC_BCOLOR   2 /**< back-face color */
 133 #define TGSI_SEMANTIC_FOG      3
 134 #define TGSI_SEMANTIC_PSIZE    4
 135 #define TGSI_SEMANTIC_GENERIC  5
 136 #define TGSI_SEMANTIC_NORMAL   6
 137 #define TGSI_SEMANTIC_FACE     7
 138 #define TGSI_SEMANTIC_COUNT    8 /**< number of semantic values */
 139
 140 struct tgsi_declaration_semantic
 141 {
 142    unsigned SemanticName   : 8;  /**< one of TGSI_SEMANTIC_x */
 143    unsigned SemanticIndex  : 16; /**< UINT */
 144    unsigned Padding        : 8;
 145 };
 146
 147 #define TGSI_IMM_FLOAT32   0
 148
 149 struct tgsi_immediate
 150 {
 151    unsigned Type       : 4;  /**< TGSI_TOKEN_TYPE_IMMEDIATE */
 152    unsigned NrTokens   : 8;  /**< UINT */
 153    unsigned DataType   : 4;  /**< one of TGSI_IMM_x */
 154    unsigned Padding    : 15;
 155    unsigned Extended   : 1;  /**< BOOL */
 156 };
 157
 158 union tgsi_immediate_data
 159 {
 160    float Float;
 161 };
 162
 163 /* TGSI opcodes.
 164  *
 165  * For more information on semantics of opcodes and
 166  * which APIs are known to use which opcodes, see
 167  * auxiliary/tgsi/tgsi-instruction-set.txt
 168  */
 169 #define TGSI_OPCODE_ARL                 0
 170 #define TGSI_OPCODE_MOV                 1
 171 #define TGSI_OPCODE_LIT                 2
 172 #define TGSI_OPCODE_RCP                 3
 173 #define TGSI_OPCODE_RSQ                 4
 174 #define TGSI_OPCODE_EXP                 5
 175 #define TGSI_OPCODE_LOG                 6
 176 #define TGSI_OPCODE_MUL                 7
 177 #define TGSI_OPCODE_ADD                 8
 178 #define TGSI_OPCODE_DP3                 9
 179 #define TGSI_OPCODE_DP4                 10
 180 #define TGSI_OPCODE_DST                 11
 181 #define TGSI_OPCODE_MIN                 12
 182 #define TGSI_OPCODE_MAX                 13
 183 #define TGSI_OPCODE_SLT                 14
 184 #define TGSI_OPCODE_SGE                 15
 185 #define TGSI_OPCODE_MAD                 16
 186 #define TGSI_OPCODE_SUB                 17
 187 #define TGSI_OPCODE_LRP                 18
 188 #define TGSI_OPCODE_CND                 19
 189                                 /* gap */
 190 #define TGSI_OPCODE_DP2A                21
 191                                 /* gap */
 192 #define TGSI_OPCODE_FRC                 24
 193 #define TGSI_OPCODE_CLAMP               25
 194 #define TGSI_OPCODE_FLR                 26
 195 #define TGSI_OPCODE_ROUND               27
 196 #define TGSI_OPCODE_EX2                 28
 197 #define TGSI_OPCODE_LG2                 29
 198 #define TGSI_OPCODE_POW                 30
 199 #define TGSI_OPCODE_XPD                 31
 200                                 /* gap */
 201 #define TGSI_OPCODE_ABS                 33
 202 #define TGSI_OPCODE_RCC                 34
 203 #define TGSI_OPCODE_DPH                 35
 204 #define TGSI_OPCODE_COS                 36
 205 #define TGSI_OPCODE_DDX                 37
 206 #define TGSI_OPCODE_DDY                 38
 207 #define TGSI_OPCODE_KILP                39  /* predicated kill */
 208 #define TGSI_OPCODE_PK2H                40
 209 #define TGSI_OPCODE_PK2US               41
 210 #define TGSI_OPCODE_PK4B                42
 211 #define TGSI_OPCODE_PK4UB               43
 212 #define TGSI_OPCODE_RFL                 44
 213 #define TGSI_OPCODE_SEQ                 45
 214 #define TGSI_OPCODE_SFL                 46
 215 #define TGSI_OPCODE_SGT                 47
 216 #define TGSI_OPCODE_SIN                 48
 217 #define TGSI_OPCODE_SLE                 49
 218 #define TGSI_OPCODE_SNE                 50
 219 #define TGSI_OPCODE_STR                 51
 220 #define TGSI_OPCODE_TEX                 52
 221 #define TGSI_OPCODE_TXD                 53
 222 #define TGSI_OPCODE_TXP                 54
 223 #define TGSI_OPCODE_UP2H                55
 224 #define TGSI_OPCODE_UP2US               56
 225 #define TGSI_OPCODE_UP4B                57
 226 #define TGSI_OPCODE_UP4UB               58
 227 #define TGSI_OPCODE_X2D                 59
 228 #define TGSI_OPCODE_ARA                 60
 229 #define TGSI_OPCODE_ARR                 61
 230 #define TGSI_OPCODE_BRA                 62
 231 #define TGSI_OPCODE_CAL                 63
 232 #define TGSI_OPCODE_RET                 64
 233 #define TGSI_OPCODE_SSG                 65 /* SGN */
 234 #define TGSI_OPCODE_CMP                 66
 235 #define TGSI_OPCODE_SCS                 67
 236 #define TGSI_OPCODE_TXB                 68
 237 #define TGSI_OPCODE_NRM                 69
 238 #define TGSI_OPCODE_DIV                 70
 239 #define TGSI_OPCODE_DP2                 71
 240 #define TGSI_OPCODE_TXL                 72
 241 #define TGSI_OPCODE_BRK                 73
 242 #define TGSI_OPCODE_IF                  74
 243 #define TGSI_OPCODE_BGNFOR              75
 244 #define TGSI_OPCODE_REP                 76
 245 #define TGSI_OPCODE_ELSE                77
 246 #define TGSI_OPCODE_ENDIF               78
 247 #define TGSI_OPCODE_ENDFOR              79
 248 #define TGSI_OPCODE_ENDREP              80
 249 #define TGSI_OPCODE_PUSHA               81
 250 #define TGSI_OPCODE_POPA                82
 251 #define TGSI_OPCODE_CEIL                83
 252 #define TGSI_OPCODE_I2F                 84
 253 #define TGSI_OPCODE_NOT                 85
 254 #define TGSI_OPCODE_TRUNC               86
 255 #define TGSI_OPCODE_SHL                 87
 256 #define TGSI_OPCODE_SHR                 88
 257 #define TGSI_OPCODE_AND                 89
 258 #define TGSI_OPCODE_OR                  90
 259 #define TGSI_OPCODE_MOD                 91
 260 #define TGSI_OPCODE_XOR                 92
 261 #define TGSI_OPCODE_SAD                 93
 262 #define TGSI_OPCODE_TXF                 94
 263 #define TGSI_OPCODE_TXQ                 95
 264 #define TGSI_OPCODE_CONT                96
 265 #define TGSI_OPCODE_EMIT                97
 266 #define TGSI_OPCODE_ENDPRIM             98
 267 #define TGSI_OPCODE_BGNLOOP             99
 268 #define TGSI_OPCODE_BGNSUB              100
 269 #define TGSI_OPCODE_ENDLOOP             101
 270 #define TGSI_OPCODE_ENDSUB              102
 271                                 /* gap */
 272 #define TGSI_OPCODE_NOP                 107
 273                                 /* gap */
 274 #define TGSI_OPCODE_NRM4                112
 275 #define TGSI_OPCODE_CALLNZ              113
 276 #define TGSI_OPCODE_IFC                 114
 277 #define TGSI_OPCODE_BREAKC              115
 278 #define TGSI_OPCODE_KIL                 116  /* conditional kill */
 279 #define TGSI_OPCODE_END                 117  /* aka HALT */
 280                                 /* gap */
 281 #define TGSI_OPCODE_LAST                119
 282
 283 #define TGSI_SAT_NONE            0  /* do not saturate */
 284 #define TGSI_SAT_ZERO_ONE        1  /* clamp to [0,1] */
 285 #define TGSI_SAT_MINUS_PLUS_ONE  2  /* clamp to [-1,1] */
 286
 287 /**
 288  * Opcode is the operation code to execute. A given operation defines the
 289  * semantics how the source registers (if any) are interpreted and what is
 290  * written to the destination registers (if any) as a result of execution.
 291  *
 292  * NumDstRegs and NumSrcRegs is the number of destination and source registers,
 293  * respectively. For a given operation code, those numbers are fixed and are
 294  * present here only for convenience.
 295  *
 296  * If Extended is TRUE, it is now executed.
 297  *
 298  * Saturate controls how are final results in destination registers modified.
 299  */
 300
 301 struct tgsi_instruction
 302 {
 303    unsigned Type       : 4;  /* TGSI_TOKEN_TYPE_INSTRUCTION */
 304    unsigned NrTokens   : 8;  /* UINT */
 305    unsigned Opcode     : 8;  /* TGSI_OPCODE_ */
 306    unsigned Saturate   : 2;  /* TGSI_SAT_ */
 307    unsigned NumDstRegs : 2;  /* UINT */
 308    unsigned NumSrcRegs : 4;  /* UINT */
 309    unsigned Padding    : 3;
 310    unsigned Extended   : 1;  /* BOOL */
 311 };
 312
 313 /*
 314  * If tgsi_instruction::Extended is TRUE, tgsi_instruction_ext follows.
 315  *
 316  * Then, tgsi_instruction::NumDstRegs of tgsi_dst_register follow.
 317  *
 318  * Then, tgsi_instruction::NumSrcRegs of tgsi_src_register follow.
 319  *
 320  * tgsi_instruction::NrTokens contains the total number of words that make the
 321  * instruction, including the instruction word.
 322  */
 323
 324 #define TGSI_INSTRUCTION_EXT_TYPE_LABEL     1
 325 #define TGSI_INSTRUCTION_EXT_TYPE_TEXTURE   2
 326 #define TGSI_INSTRUCTION_EXT_TYPE_PREDICATE 3
 327
 328 struct tgsi_instruction_ext
 329 {
 330    unsigned Type       : 4;  /* TGSI_INSTRUCTION_EXT_TYPE_ */
 331    unsigned Padding    : 27;
 332    unsigned Extended   : 1;  /* BOOL */
 333 };
 334
 335 /*
 336  * If tgsi_instruction_ext::Type is TGSI_INSTRUCTION_EXT_TYPE_LABEL, it
 337  * should be cast to tgsi_instruction_ext_label.
 338  *
 339  * If tgsi_instruction_ext::Type is TGSI_INSTRUCTION_EXT_TYPE_TEXTURE, it
 340  * should be cast to tgsi_instruction_ext_texture.
 341  *
 342  * If tgsi_instruction_ext::Type is TGSI_INSTRUCTION_EXT_TYPE_PREDICATE, it
 343  * should be cast to tgsi_instruction_ext_predicate.
 344  *
 345  * If tgsi_instruction_ext::Extended is TRUE, another tgsi_instruction_ext
 346  * follows.
 347  */
 348
 349 #define TGSI_SWIZZLE_X      0
 350 #define TGSI_SWIZZLE_Y      1
 351 #define TGSI_SWIZZLE_Z      2
 352 #define TGSI_SWIZZLE_W      3
 353
 354 struct tgsi_instruction_ext_label
 355 {
 356    unsigned Type     : 4;    /* TGSI_INSTRUCTION_EXT_TYPE_LABEL */
 357    unsigned Label    : 24;   /* UINT */
 358    unsigned Padding  : 3;
 359    unsigned Extended : 1;    /* BOOL */
 360 };
 361
 362 #define TGSI_TEXTURE_UNKNOWN        0
 363 #define TGSI_TEXTURE_1D             1
 364 #define TGSI_TEXTURE_2D             2
 365 #define TGSI_TEXTURE_3D             3
 366 #define TGSI_TEXTURE_CUBE           4
 367 #define TGSI_TEXTURE_RECT           5
 368 #define TGSI_TEXTURE_SHADOW1D       6
 369 #define TGSI_TEXTURE_SHADOW2D       7
 370 #define TGSI_TEXTURE_SHADOWRECT     8
 371 #define TGSI_TEXTURE_COUNT          9
 372
 373 struct tgsi_instruction_ext_texture
 374 {
 375    unsigned Type     : 4;    /* TGSI_INSTRUCTION_EXT_TYPE_TEXTURE */
 376    unsigned Texture  : 8;    /* TGSI_TEXTURE_ */
 377    unsigned Padding  : 19;
 378    unsigned Extended : 1;    /* BOOL */
 379 };
 380
 381 /*
 382  * For SM3, the following constraint applies.
 383  *   - Swizzle is either set to identity or replicate.
 384  */
 385 struct tgsi_instruction_ext_predicate
 386 {
 387    unsigned Type     : 4;  /* TGSI_INSTRUCTION_EXT_TYPE_PREDICATE */
 388    unsigned SwizzleX : 2;  /* TGSI_SWIZZLE_x */
 389    unsigned SwizzleY : 2;  /* TGSI_SWIZZLE_x */
 390    unsigned SwizzleZ : 2;  /* TGSI_SWIZZLE_x */
 391    unsigned SwizzleW : 2;  /* TGSI_SWIZZLE_x */
 392    unsigned Negate   : 1;  /* BOOL */
 393    unsigned SrcIndex : 8;  /* UINT */
 394    unsigned Padding  : 10;
 395    unsigned Extended : 1;  /* BOOL */
 396 };
 397
 398 /**
 399  * File specifies the register array to access.
 400  *
 401  * Index specifies the element number of a register in the register file.
 402  *
 403  * If Indirect is TRUE, Index should be offset by the X component of a source
 404  * register that follows. The register can be now fetched into local storage
 405  * for further processing.
 406  *
 407  * If Negate is TRUE, all components of the fetched register are negated.
 408  *
 409  * The fetched register components are swizzled according to SwizzleX, SwizzleY,
 410  * SwizzleZ and SwizzleW.
 411  *
 412  * If Extended is TRUE, any further modifications to the source register are
 413  * made to this temporary storage.
 414  */
 415
 416 struct tgsi_src_register
 417 {
 418    unsigned File        : 4;  /* TGSI_FILE_ */
 419    unsigned SwizzleX    : 2;  /* TGSI_SWIZZLE_ */
 420    unsigned SwizzleY    : 2;  /* TGSI_SWIZZLE_ */
 421    unsigned SwizzleZ    : 2;  /* TGSI_SWIZZLE_ */
 422    unsigned SwizzleW    : 2;  /* TGSI_SWIZZLE_ */
 423    unsigned Negate      : 1;  /* BOOL */
 424    unsigned Indirect    : 1;  /* BOOL */
 425    unsigned Dimension   : 1;  /* BOOL */
 426    int      Index       : 16; /* SINT */
 427    unsigned Extended    : 1;  /* BOOL */
 428 };
 429
 430 /**
 431  * If tgsi_src_register::Extended is TRUE, tgsi_src_register_ext follows.
 432  *
 433  * Then, if tgsi_src_register::Indirect is TRUE, another tgsi_src_register
 434  * follows.
 435  *
 436  * Then, if tgsi_src_register::Dimension is TRUE, tgsi_dimension follows.
 437  */
 438
 439 #define TGSI_SRC_REGISTER_EXT_TYPE_MOD      1
 440
 441 struct tgsi_src_register_ext
 442 {
 443    unsigned Type     : 4;    /* TGSI_SRC_REGISTER_EXT_TYPE_ */
 444    unsigned Padding  : 27;
 445    unsigned Extended : 1;    /* BOOL */
 446 };
 447
 448 /**
 449  * If tgsi_src_register_ext::Type is TGSI_SRC_REGISTER_EXT_TYPE_MOD,
 450  * it should be cast to tgsi_src_register_ext_mod.
 451  *
 452  * If tgsi_dst_register_ext::Extended is TRUE, another tgsi_dst_register_ext
 453  * follows.
 454  */
 455
 456
 457 /**
 458  * Extra src register modifiers
 459  *
 460  * If Complement is TRUE, the source register is modified by subtracting it
 461  * from 1.0.
 462  *
 463  * If Bias is TRUE, the source register is modified by subtracting 0.5 from it.
 464  *
 465  * If Scale2X is TRUE, the source register is modified by multiplying it by 2.0.
 466  *
 467  * If Absolute is TRUE, the source register is modified by removing the sign.
 468  *
 469  * If Negate is TRUE, the source register is modified by negating it.
 470  */
 471
 472 struct tgsi_src_register_ext_mod
 473 {
 474    unsigned Type         : 4;    /* TGSI_SRC_REGISTER_EXT_TYPE_MOD */
 475    unsigned Complement   : 1;    /* BOOL */
 476    unsigned Bias         : 1;    /* BOOL */
 477    unsigned Scale2X      : 1;    /* BOOL */
 478    unsigned Absolute     : 1;    /* BOOL */
 479    unsigned Negate       : 1;    /* BOOL */
 480    unsigned Padding      : 22;
 481    unsigned Extended     : 1;    /* BOOL */
 482 };
 483
 484 struct tgsi_dimension
 485 {
 486    unsigned Indirect    : 1;  /* BOOL */
 487    unsigned Dimension   : 1;  /* BOOL */
 488    unsigned Padding     : 13;
 489    int      Index       : 16; /* SINT */
 490    unsigned Extended    : 1;  /* BOOL */
 491 };
 492
 493 struct tgsi_dst_register
 494 {
 495    unsigned File        : 4;  /* TGSI_FILE_ */
 496    unsigned WriteMask   : 4;  /* TGSI_WRITEMASK_ */
 497    unsigned Indirect    : 1;  /* BOOL */
 498    unsigned Dimension   : 1;  /* BOOL */
 499    int      Index       : 16; /* SINT */
 500    unsigned Padding     : 5;
 501    unsigned Extended    : 1;  /* BOOL */
 502 };
 503
 504 /*
 505  * If tgsi_dst_register::Extended is TRUE, tgsi_dst_register_ext follows.
 506  *
 507  * Then, if tgsi_dst_register::Indirect is TRUE, tgsi_src_register follows.
 508  */
 509
 510 #define TGSI_DST_REGISTER_EXT_TYPE_MODULATE     1
 511
 512 struct tgsi_dst_register_ext
 513 {
 514    unsigned Type     : 4;    /* TGSI_DST_REGISTER_EXT_TYPE_ */
 515    unsigned Padding  : 27;
 516    unsigned Extended : 1;    /* BOOL */
 517 };
 518
 519 /**
 520  * Extra destination register modifiers
 521  *
 522  * If tgsi_dst_register_ext::Type is TGSI_DST_REGISTER_EXT_TYPE_MODULATE,
 523  * it should be cast to tgsi_dst_register_ext_modulate.
 524  *
 525  * If tgsi_dst_register_ext::Extended is TRUE, another tgsi_dst_register_ext
 526  * follows.
 527  */
 528
 529 #define TGSI_MODULATE_1X        0
 530 #define TGSI_MODULATE_2X        1
 531 #define TGSI_MODULATE_4X        2
 532 #define TGSI_MODULATE_8X        3
 533 #define TGSI_MODULATE_HALF      4
 534 #define TGSI_MODULATE_QUARTER   5
 535 #define TGSI_MODULATE_EIGHTH    6
 536 #define TGSI_MODULATE_COUNT     7
 537
 538 struct tgsi_dst_register_ext_modulate
 539 {
 540    unsigned Type     : 4;    /* TGSI_DST_REGISTER_EXT_TYPE_MODULATE */
 541    unsigned Modulate : 4;    /* TGSI_MODULATE_ */
 542    unsigned Padding  : 23;
 543    unsigned Extended : 1;    /* BOOL */
 544 };
 545
 546 #ifdef __cplusplus
 547 }
 548 #endif
 549
 550 #endif /* P_SHADER_TOKENS_H */