src/mesa/shader/nvvertparse.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.0.1
   4  *
   5  * Copyright (C) 1999-2004  Brian Paul   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 "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file nvvertparse.c
  27  * NVIDIA vertex program parser.
  28  * \author Brian Paul
  29  */
  30
  31 /*
  32  * Regarding GL_NV_vertex_program, GL_NV_vertex_program1_1:
  33  *
  34  * Portions of this software may use or implement intellectual
  35  * property owned and licensed by NVIDIA Corporation. NVIDIA disclaims
  36  * any and all warranties with respect to such intellectual property,
  37  * including any use thereof or modifications thereto.
  38  */
  39
  40 #include "glheader.h"
  41 #include "context.h"
  42 #include "hash.h"
  43 #include "imports.h"
  44 #include "macros.h"
  45 #include "mtypes.h"
  46 #include "nvprogram.h"
  47 #include "nvvertparse.h"
  48 #include "nvvertprog.h"
  49 #include "program.h"
  50
  51
  52 /**
  53  * Current parsing state.  This structure is passed among the parsing
  54  * functions and keeps track of the current parser position and various
  55  * program attributes.
  56  */
  57 struct parse_state {
  58    GLcontext *ctx;
  59    const GLubyte *start;
  60    const GLubyte *pos;
  61    const GLubyte *curLine;
  62    GLboolean isStateProgram;
  63    GLboolean isPositionInvariant;
  64    GLboolean isVersion1_1;
  65    GLuint inputsRead;
  66    GLuint outputsWritten;
  67    GLboolean anyProgRegsWritten;
  68    GLuint numInst;                 /* number of instructions parsed */
  69 };
  70
  71
  72 /*
  73  * Called whenever we find an error during parsing.
  74  */
  75 static void
  76 record_error(struct parse_state *parseState, const char *msg, int lineNo)
  77 {
  78 #ifdef DEBUG
  79    GLint line, column;
  80    const GLubyte *lineStr;
  81    lineStr = _mesa_find_line_column(parseState->start,
  82                                     parseState->pos, &line, &column);
  83    _mesa_debug(parseState->ctx,
  84                "nvfragparse.c(%d): line %d, column %d:%s (%s)\n",
  85                lineNo, line, column, (char *) lineStr, msg);
  86    _mesa_free((void *) lineStr);
  87 #else
  88    (void) lineNo;
  89 #endif
  90
  91    /* Check that no error was already recorded.  Only record the first one. */
  92    if (parseState->ctx->Program.ErrorString[0] == 0) {
  93       _mesa_set_program_error(parseState->ctx,
  94                               parseState->pos - parseState->start,
  95                               msg);
  96    }
  97 }
  98
  99
 100 #define RETURN_ERROR                                                    \
 101 do {                                                                    \
 102    record_error(parseState, "Unexpected end of input.", __LINE__);      \
 103    return GL_FALSE;                                                     \
 104 } while(0)
 105
 106 #define RETURN_ERROR1(msg)                                              \
 107 do {                                                                    \
 108    record_error(parseState, msg, __LINE__);                             \
 109    return GL_FALSE;                                                     \
 110 } while(0)
 111
 112 #define RETURN_ERROR2(msg1, msg2)                                       \
 113 do {                                                                    \
 114    char err[1000];                                                      \
 115    _mesa_sprintf(err, "%s %s", msg1, msg2);                             \
 116    record_error(parseState, err, __LINE__);                             \
 117    return GL_FALSE;                                                     \
 118 } while(0)
 119
 120
 121
 122
 123
 124 static GLboolean IsLetter(GLubyte b)
 125 {
 126    return (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z');
 127 }
 128
 129
 130 static GLboolean IsDigit(GLubyte b)
 131 {
 132    return b >= '0' && b <= '9';
 133 }
 134
 135
 136 static GLboolean IsWhitespace(GLubyte b)
 137 {
 138    return b == ' ' || b == '\t' || b == '\n' || b == '\r';
 139 }
 140
 141
 142 /**
 143  * Starting at 'str' find the next token.  A token can be an integer,
 144  * an identifier or punctuation symbol.
 145  * \return <= 0 we found an error, else, return number of characters parsed.
 146  */
 147 static GLint
 148 GetToken(struct parse_state *parseState, GLubyte *token)
 149 {
 150    const GLubyte *str = parseState->pos;
 151    GLint i = 0, j = 0;
 152
 153    token[0] = 0;
 154
 155    /* skip whitespace and comments */
 156    while (str[i] && (IsWhitespace(str[i]) || str[i] == '#')) {
 157       if (str[i] == '#') {
 158          /* skip comment */
 159          while (str[i] && (str[i] != '\n' && str[i] != '\r')) {
 160             i++;
 161          }
 162          if (str[i] == '\n' || str[i] == '\r')
 163             parseState->curLine = str + i + 1;
 164       }
 165       else {
 166          /* skip whitespace */
 167          if (str[i] == '\n' || str[i] == '\r')
 168             parseState->curLine = str + i + 1;
 169          i++;
 170       }
 171    }
 172
 173    if (str[i] == 0)
 174       return -i;
 175
 176    /* try matching an integer */
 177    while (str[i] && IsDigit(str[i])) {
 178       token[j++] = str[i++];
 179    }
 180    if (j > 0 || !str[i]) {
 181       token[j] = 0;
 182       return i;
 183    }
 184
 185    /* try matching an identifier */
 186    if (IsLetter(str[i])) {
 187       while (str[i] && (IsLetter(str[i]) || IsDigit(str[i]))) {
 188          token[j++] = str[i++];
 189       }
 190       token[j] = 0;
 191       return i;
 192    }
 193
 194    /* punctuation character */
 195    if (str[i]) {
 196       token[0] = str[i++];
 197       token[1] = 0;
 198       return i;
 199    }
 200
 201    /* end of input */
 202    token[0] = 0;
 203    return i;
 204 }
 205
 206
 207 /**
 208  * Get next token from input stream and increment stream pointer past token.
 209  */
 210 static GLboolean
 211 Parse_Token(struct parse_state *parseState, GLubyte *token)
 212 {
 213    GLint i;
 214    i = GetToken(parseState, token);
 215    if (i <= 0) {
 216       parseState->pos += (-i);
 217       return GL_FALSE;
 218    }
 219    parseState->pos += i;
 220    return GL_TRUE;
 221 }
 222
 223
 224 /**
 225  * Get next token from input stream but don't increment stream pointer.
 226  */
 227 static GLboolean
 228 Peek_Token(struct parse_state *parseState, GLubyte *token)
 229 {
 230    GLint i, len;
 231    i = GetToken(parseState, token);
 232    if (i <= 0) {
 233       parseState->pos += (-i);
 234       return GL_FALSE;
 235    }
 236    len = _mesa_strlen((const char *) token);
 237    parseState->pos += (i - len);
 238    return GL_TRUE;
 239 }
 240
 241
 242 /**
 243  * Try to match 'pattern' as the next token after any whitespace/comments.
 244  * Advance the current parsing position only if we match the pattern.
 245  * \return GL_TRUE if pattern is matched, GL_FALSE otherwise.
 246  */
 247 static GLboolean
 248 Parse_String(struct parse_state *parseState, const char *pattern)
 249 {
 250    const GLubyte *m;
 251    GLint i;
 252
 253    /* skip whitespace and comments */
 254    while (IsWhitespace(*parseState->pos) || *parseState->pos == '#') {
 255       if (*parseState->pos == '#') {
 256          while (*parseState->pos && (*parseState->pos != '\n' && *parseState->pos != '\r')) {
 257             parseState->pos += 1;
 258          }
 259          if (*parseState->pos == '\n' || *parseState->pos == '\r')
 260             parseState->curLine = parseState->pos + 1;
 261       }
 262       else {
 263          /* skip whitespace */
 264          if (*parseState->pos == '\n' || *parseState->pos == '\r')
 265             parseState->curLine = parseState->pos + 1;
 266          parseState->pos += 1;
 267       }
 268    }
 269
 270    /* Try to match the pattern */
 271    m = parseState->pos;
 272    for (i = 0; pattern[i]; i++) {
 273       if (*m != (GLubyte) pattern[i])
 274          return GL_FALSE;
 275       m += 1;
 276    }
 277    parseState->pos = m;
 278
 279    return GL_TRUE; /* success */
 280 }
 281
 282
 283 /**********************************************************************/
 284
 285 static const char *InputRegisters[MAX_NV_VERTEX_PROGRAM_INPUTS + 1] = {
 286    "OPOS", "WGHT", "NRML", "COL0", "COL1", "FOGC", "6", "7",
 287    "TEX0", "TEX1", "TEX2", "TEX3", "TEX4", "TEX5", "TEX6", "TEX7", NULL
 288 };
 289
 290 static const char *OutputRegisters[MAX_NV_VERTEX_PROGRAM_OUTPUTS + 1] = {
 291    "HPOS", "COL0", "COL1", "BFC0", "BFC1", "FOGC", "PSIZ",
 292    "TEX0", "TEX1", "TEX2", "TEX3", "TEX4", "TEX5", "TEX6", "TEX7", NULL
 293 };
 294
 295 /* NOTE: the order here must match opcodes in nvvertprog.h */
 296 static const char *Opcodes[] = {
 297    "MOV", "LIT", "RCP", "RSQ", "EXP", "LOG", "MUL", "ADD", "DP3", "DP4",
 298    "DST", "MIN", "MAX", "SLT", "SGE", "MAD", "ARL", "DPH", "RCC", "SUB",
 299    "ABS", "END",
 300    /* GL_ARB_vertex_program */
 301    "FLR", "FRC", "EX2", "LG2", "POW", "XPD", "SWZ",
 302    NULL
 303 };
 304
 305
 306
 307 /**
 308  * Parse a temporary register: Rnn
 309  */
 310 static GLboolean
 311 Parse_TempReg(struct parse_state *parseState, GLint *tempRegNum)
 312 {
 313    GLubyte token[100];
 314
 315    /* Should be 'R##' */
 316    if (!Parse_Token(parseState, token))
 317       RETURN_ERROR;
 318    if (token[0] != 'R')
 319       RETURN_ERROR1("Expected R##");
 320
 321    if (IsDigit(token[1])) {
 322       GLint reg = _mesa_atoi((char *) (token + 1));
 323       if (reg >= MAX_NV_VERTEX_PROGRAM_TEMPS)
 324          RETURN_ERROR1("Bad temporary register name");
 325       *tempRegNum = reg;
 326    }
 327    else {
 328       RETURN_ERROR1("Bad temporary register name");
 329    }
 330
 331    return GL_TRUE;
 332 }
 333
 334
 335 /**
 336  * Parse address register "A0.x"
 337  */
 338 static GLboolean
 339 Parse_AddrReg(struct parse_state *parseState)
 340 {
 341    /* match 'A0' */
 342    if (!Parse_String(parseState, "A0"))
 343       RETURN_ERROR;
 344
 345    /* match '.' */
 346    if (!Parse_String(parseState, "."))
 347       RETURN_ERROR;
 348
 349    /* match 'x' */
 350    if (!Parse_String(parseState, "x"))
 351       RETURN_ERROR;
 352
 353    return GL_TRUE;
 354 }
 355
 356
 357 /**
 358  * Parse absolute program parameter register "c[##]"
 359  */
 360 static GLboolean
 361 Parse_AbsParamReg(struct parse_state *parseState, GLint *regNum)
 362 {
 363    GLubyte token[100];
 364
 365    if (!Parse_String(parseState, "c"))
 366       RETURN_ERROR;
 367
 368    if (!Parse_String(parseState, "["))
 369       RETURN_ERROR;
 370
 371    if (!Parse_Token(parseState, token))
 372       RETURN_ERROR;
 373
 374    if (IsDigit(token[0])) {
 375       /* a numbered program parameter register */
 376       GLint reg = _mesa_atoi((char *) token);
 377       if (reg >= MAX_NV_VERTEX_PROGRAM_PARAMS)
 378          RETURN_ERROR1("Bad program parameter number");
 379       *regNum = reg;
 380    }
 381    else {
 382       RETURN_ERROR;
 383    }
 384
 385    if (!Parse_String(parseState, "]"))
 386       RETURN_ERROR;
 387
 388    return GL_TRUE;
 389 }
 390
 391
 392 static GLboolean
 393 Parse_ParamReg(struct parse_state *parseState, struct vp_src_register *srcReg)
 394 {
 395    GLubyte token[100];
 396
 397    if (!Parse_String(parseState, "c"))
 398       RETURN_ERROR;
 399
 400    if (!Parse_String(parseState, "["))
 401       RETURN_ERROR;
 402
 403    if (!Peek_Token(parseState, token))
 404       RETURN_ERROR;
 405
 406    if (IsDigit(token[0])) {
 407       /* a numbered program parameter register */
 408       GLint reg;
 409       (void) Parse_Token(parseState, token);
 410       reg = _mesa_atoi((char *) token);
 411       if (reg >= MAX_NV_VERTEX_PROGRAM_PARAMS)
 412          RETURN_ERROR1("Bad program parameter number");
 413       srcReg->File = PROGRAM_ENV_PARAM;
 414       srcReg->Index = reg;
 415    }
 416    else if (_mesa_strcmp((const char *) token, "A0") == 0) {
 417       /* address register "A0.x" */
 418       if (!Parse_AddrReg(parseState))
 419          RETURN_ERROR;
 420
 421       srcReg->RelAddr = GL_TRUE;
 422       srcReg->File = PROGRAM_ENV_PARAM;
 423       /* Look for +/-N offset */
 424       if (!Peek_Token(parseState, token))
 425          RETURN_ERROR;
 426
 427       if (token[0] == '-' || token[0] == '+') {
 428          const GLubyte sign = token[0];
 429          (void) Parse_Token(parseState, token); /* consume +/- */
 430
 431          /* an integer should be next */
 432          if (!Parse_Token(parseState, token))
 433             RETURN_ERROR;
 434
 435          if (IsDigit(token[0])) {
 436             const GLint k = _mesa_atoi((char *) token);
 437             if (sign == '-') {
 438                if (k > 64)
 439                   RETURN_ERROR1("Bad address offset");
 440                srcReg->Index = -k;
 441             }
 442             else {
 443                if (k > 63)
 444                   RETURN_ERROR1("Bad address offset");
 445                srcReg->Index = k;
 446             }
 447          }
 448          else {
 449             RETURN_ERROR;
 450          }
 451       }
 452       else {
 453          /* probably got a ']', catch it below */
 454       }
 455    }
 456    else {
 457       RETURN_ERROR;
 458    }
 459
 460    /* Match closing ']' */
 461    if (!Parse_String(parseState, "]"))
 462       RETURN_ERROR;
 463
 464    return GL_TRUE;
 465 }
 466
 467
 468 /**
 469  * Parse v[#] or v[<name>]
 470  */
 471 static GLboolean
 472 Parse_AttribReg(struct parse_state *parseState, GLint *tempRegNum)
 473 {
 474    GLubyte token[100];
 475    GLint j;
 476
 477    /* Match 'v' */
 478    if (!Parse_String(parseState, "v"))
 479       RETURN_ERROR;
 480
 481    /* Match '[' */
 482    if (!Parse_String(parseState, "["))
 483       RETURN_ERROR;
 484
 485    /* match number or named register */
 486    if (!Parse_Token(parseState, token))
 487       RETURN_ERROR;
 488
 489    if (parseState->isStateProgram && token[0] != '0')
 490       RETURN_ERROR1("Only v[0] accessible in vertex state programs");
 491
 492    if (IsDigit(token[0])) {
 493       GLint reg = _mesa_atoi((char *) token);
 494       if (reg >= MAX_NV_VERTEX_PROGRAM_INPUTS)
 495          RETURN_ERROR1("Bad vertex attribute register name");
 496       *tempRegNum = reg;
 497    }
 498    else {
 499       for (j = 0; InputRegisters[j]; j++) {
 500          if (_mesa_strcmp((const char *) token, InputRegisters[j]) == 0) {
 501             *tempRegNum = j;
 502             break;
 503          }
 504       }
 505       if (!InputRegisters[j]) {
 506          /* unknown input register label */
 507          RETURN_ERROR2("Bad register name", token);
 508       }
 509    }
 510
 511    /* Match '[' */
 512    if (!Parse_String(parseState, "]"))
 513       RETURN_ERROR;
 514
 515    return GL_TRUE;
 516 }
 517
 518
 519 static GLboolean
 520 Parse_OutputReg(struct parse_state *parseState, GLint *outputRegNum)
 521 {
 522    GLubyte token[100];
 523    GLint start, j;
 524
 525    /* Match 'o' */
 526    if (!Parse_String(parseState, "o"))
 527       RETURN_ERROR;
 528
 529    /* Match '[' */
 530    if (!Parse_String(parseState, "["))
 531       RETURN_ERROR;
 532
 533    /* Get output reg name */
 534    if (!Parse_Token(parseState, token))
 535       RETURN_ERROR;
 536
 537    if (parseState->isPositionInvariant)
 538       start = 1; /* skip HPOS register name */
 539    else
 540       start = 0;
 541
 542    /* try to match an output register name */
 543    for (j = start; OutputRegisters[j]; j++) {
 544       if (_mesa_strcmp((const char *) token, OutputRegisters[j]) == 0) {
 545          *outputRegNum = j;
 546          break;
 547       }
 548    }
 549    if (!OutputRegisters[j])
 550       RETURN_ERROR1("Unrecognized output register name");
 551
 552    /* Match ']' */
 553    if (!Parse_String(parseState, "]"))
 554       RETURN_ERROR1("Expected ]");
 555
 556    return GL_TRUE;
 557 }
 558
 559
 560 static GLboolean
 561 Parse_MaskedDstReg(struct parse_state *parseState, struct vp_dst_register *dstReg)
 562 {
 563    GLubyte token[100];
 564
 565    /* Dst reg can be R<n> or o[n] */
 566    if (!Peek_Token(parseState, token))
 567       RETURN_ERROR;
 568
 569    if (token[0] == 'R') {
 570       /* a temporary register */
 571       dstReg->File = PROGRAM_TEMPORARY;
 572       if (!Parse_TempReg(parseState, &dstReg->Index))
 573          RETURN_ERROR;
 574    }
 575    else if (!parseState->isStateProgram && token[0] == 'o') {
 576       /* an output register */
 577       dstReg->File = PROGRAM_OUTPUT;
 578       if (!Parse_OutputReg(parseState, &dstReg->Index))
 579          RETURN_ERROR;
 580    }
 581    else if (parseState->isStateProgram && token[0] == 'c' &&
 582             parseState->isStateProgram) {
 583       /* absolute program parameter register */
 584       /* Only valid for vertex state programs */
 585       dstReg->File = PROGRAM_ENV_PARAM;
 586       if (!Parse_AbsParamReg(parseState, &dstReg->Index))
 587          RETURN_ERROR;
 588    }
 589    else {
 590       RETURN_ERROR1("Bad destination register name");
 591    }
 592
 593    /* Parse optional write mask */
 594    if (!Peek_Token(parseState, token))
 595       RETURN_ERROR;
 596
 597    if (token[0] == '.') {
 598       /* got a mask */
 599       GLint k = 0;
 600
 601       if (!Parse_String(parseState, "."))
 602          RETURN_ERROR;
 603
 604       if (!Parse_Token(parseState, token))
 605          RETURN_ERROR;
 606
 607       dstReg->WriteMask[0] = GL_FALSE;
 608       dstReg->WriteMask[1] = GL_FALSE;
 609       dstReg->WriteMask[2] = GL_FALSE;
 610       dstReg->WriteMask[3] = GL_FALSE;
 611
 612       if (token[k] == 'x') {
 613          dstReg->WriteMask[0] = GL_TRUE;
 614          k++;
 615       }
 616       if (token[k] == 'y') {
 617          dstReg->WriteMask[1] = GL_TRUE;
 618          k++;
 619       }
 620       if (token[k] == 'z') {
 621          dstReg->WriteMask[2] = GL_TRUE;
 622          k++;
 623       }
 624       if (token[k] == 'w') {
 625          dstReg->WriteMask[3] = GL_TRUE;
 626          k++;
 627       }
 628       if (k == 0) {
 629          RETURN_ERROR1("Bad writemask character");
 630       }
 631       return GL_TRUE;
 632    }
 633    else {
 634       dstReg->WriteMask[0] = GL_TRUE;
 635       dstReg->WriteMask[1] = GL_TRUE;
 636       dstReg->WriteMask[2] = GL_TRUE;
 637       dstReg->WriteMask[3] = GL_TRUE;
 638       return GL_TRUE;
 639    }
 640 }
 641
 642
 643 static GLboolean
 644 Parse_SwizzleSrcReg(struct parse_state *parseState, struct vp_src_register *srcReg)
 645 {
 646    GLubyte token[100];
 647
 648    srcReg->RelAddr = GL_FALSE;
 649
 650    /* check for '-' */
 651    if (!Peek_Token(parseState, token))
 652       RETURN_ERROR;
 653    if (token[0] == '-') {
 654       (void) Parse_String(parseState, "-");
 655       srcReg->Negate = GL_TRUE;
 656       if (!Peek_Token(parseState, token))
 657          RETURN_ERROR;
 658    }
 659    else {
 660       srcReg->Negate = GL_FALSE;
 661    }
 662
 663    /* Src reg can be R<n>, c[n], c[n +/- offset], or a named vertex attrib */
 664    if (token[0] == 'R') {
 665       srcReg->File = PROGRAM_TEMPORARY;
 666       if (!Parse_TempReg(parseState, &srcReg->Index))
 667          RETURN_ERROR;
 668    }
 669    else if (token[0] == 'c') {
 670       if (!Parse_ParamReg(parseState, srcReg))
 671          RETURN_ERROR;
 672    }
 673    else if (token[0] == 'v') {
 674       srcReg->File = PROGRAM_INPUT;
 675       if (!Parse_AttribReg(parseState, &srcReg->Index))
 676          RETURN_ERROR;
 677    }
 678    else {
 679       RETURN_ERROR2("Bad source register name", token);
 680    }
 681
 682    /* init swizzle fields */
 683    srcReg->Swizzle[0] = 0;
 684    srcReg->Swizzle[1] = 1;
 685    srcReg->Swizzle[2] = 2;
 686    srcReg->Swizzle[3] = 3;
 687
 688    /* Look for optional swizzle suffix */
 689    if (!Peek_Token(parseState, token))
 690       RETURN_ERROR;
 691    if (token[0] == '.') {
 692       (void) Parse_String(parseState, ".");  /* consume . */
 693
 694       if (!Parse_Token(parseState, token))
 695          RETURN_ERROR;
 696
 697       if (token[1] == 0) {
 698          /* single letter swizzle */
 699          if (token[0] == 'x')
 700             ASSIGN_4V(srcReg->Swizzle, 0, 0, 0, 0);
 701          else if (token[0] == 'y')
 702             ASSIGN_4V(srcReg->Swizzle, 1, 1, 1, 1);
 703          else if (token[0] == 'z')
 704             ASSIGN_4V(srcReg->Swizzle, 2, 2, 2, 2);
 705          else if (token[0] == 'w')
 706             ASSIGN_4V(srcReg->Swizzle, 3, 3, 3, 3);
 707          else
 708             RETURN_ERROR1("Expected x, y, z, or w");
 709       }
 710       else {
 711          /* 2, 3 or 4-component swizzle */
 712          GLint k;
 713          for (k = 0; token[k] && k < 5; k++) {
 714             if (token[k] == 'x')
 715                srcReg->Swizzle[k] = 0;
 716             else if (token[k] == 'y')
 717                srcReg->Swizzle[k] = 1;
 718             else if (token[k] == 'z')
 719                srcReg->Swizzle[k] = 2;
 720             else if (token[k] == 'w')
 721                srcReg->Swizzle[k] = 3;
 722             else
 723                RETURN_ERROR;
 724          }
 725          if (k >= 5)
 726             RETURN_ERROR;
 727       }
 728    }
 729
 730    return GL_TRUE;
 731 }
 732
 733
 734 static GLboolean
 735 Parse_ScalarSrcReg(struct parse_state *parseState, struct vp_src_register *srcReg)
 736 {
 737    GLubyte token[100];
 738
 739    srcReg->RelAddr = GL_FALSE;
 740
 741    /* check for '-' */
 742    if (!Peek_Token(parseState, token))
 743       RETURN_ERROR;
 744    if (token[0] == '-') {
 745       srcReg->Negate = GL_TRUE;
 746       (void) Parse_String(parseState, "-"); /* consume '-' */
 747       if (!Peek_Token(parseState, token))
 748          RETURN_ERROR;
 749    }
 750    else {
 751       srcReg->Negate = GL_FALSE;
 752    }
 753
 754    /* Src reg can be R<n>, c[n], c[n +/- offset], or a named vertex attrib */
 755    if (token[0] == 'R') {
 756       srcReg->File = PROGRAM_TEMPORARY;
 757       if (!Parse_TempReg(parseState, &srcReg->Index))
 758          RETURN_ERROR;
 759    }
 760    else if (token[0] == 'c') {
 761       if (!Parse_ParamReg(parseState, srcReg))
 762          RETURN_ERROR;
 763    }
 764    else if (token[0] == 'v') {
 765       srcReg->File = PROGRAM_INPUT;
 766       if (!Parse_AttribReg(parseState, &srcReg->Index))
 767          RETURN_ERROR;
 768    }
 769    else {
 770       RETURN_ERROR2("Bad source register name", token);
 771    }
 772
 773    /* Look for .[xyzw] suffix */
 774    if (!Parse_String(parseState, "."))
 775       RETURN_ERROR;
 776
 777    if (!Parse_Token(parseState, token))
 778       RETURN_ERROR;
 779
 780    if (token[0] == 'x' && token[1] == 0) {
 781       srcReg->Swizzle[0] = 0;
 782    }
 783    else if (token[0] == 'y' && token[1] == 0) {
 784       srcReg->Swizzle[0] = 1;
 785    }
 786    else if (token[0] == 'z' && token[1] == 0) {
 787       srcReg->Swizzle[0] = 2;
 788    }
 789    else if (token[0] == 'w' && token[1] == 0) {
 790       srcReg->Swizzle[0] = 3;
 791    }
 792    else {
 793       RETURN_ERROR1("Bad scalar source suffix");
 794    }
 795    srcReg->Swizzle[1] = srcReg->Swizzle[2] = srcReg->Swizzle[3] = 0;
 796
 797    return GL_TRUE;
 798 }
 799
 800
 801 static GLint
 802 Parse_UnaryOpInstruction(struct parse_state *parseState,
 803                          struct vp_instruction *inst, enum vp_opcode opcode)
 804 {
 805    if (opcode == VP_OPCODE_ABS && !parseState->isVersion1_1)
 806       RETURN_ERROR1("ABS illegal for vertex program 1.0");
 807
 808    inst->Opcode = opcode;
 809    inst->StringPos = parseState->curLine - parseState->start;
 810
 811    /* dest reg */
 812    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 813       RETURN_ERROR;
 814
 815    /* comma */
 816    if (!Parse_String(parseState, ","))
 817       RETURN_ERROR;
 818
 819    /* src arg */
 820    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[0]))
 821       RETURN_ERROR;
 822
 823    /* semicolon */
 824    if (!Parse_String(parseState, ";"))
 825       RETURN_ERROR;
 826
 827    return GL_TRUE;
 828 }
 829
 830
 831 static GLboolean
 832 Parse_BiOpInstruction(struct parse_state *parseState,
 833                       struct vp_instruction *inst, enum vp_opcode opcode)
 834 {
 835    if (opcode == VP_OPCODE_DPH && !parseState->isVersion1_1)
 836       RETURN_ERROR1("DPH illegal for vertex program 1.0");
 837    if (opcode == VP_OPCODE_SUB && !parseState->isVersion1_1)
 838       RETURN_ERROR1("SUB illegal for vertex program 1.0");
 839
 840    inst->Opcode = opcode;
 841    inst->StringPos = parseState->curLine - parseState->start;
 842
 843    /* dest reg */
 844    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 845       RETURN_ERROR;
 846
 847    /* comma */
 848    if (!Parse_String(parseState, ","))
 849       RETURN_ERROR;
 850
 851    /* first src arg */
 852    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[0]))
 853       RETURN_ERROR;
 854
 855    /* comma */
 856    if (!Parse_String(parseState, ","))
 857       RETURN_ERROR;
 858
 859    /* second src arg */
 860    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[1]))
 861       RETURN_ERROR;
 862
 863    /* semicolon */
 864    if (!Parse_String(parseState, ";"))
 865       RETURN_ERROR;
 866
 867    /* make sure we don't reference more than one program parameter register */
 868    if (inst->SrcReg[0].File == PROGRAM_ENV_PARAM &&
 869        inst->SrcReg[1].File == PROGRAM_ENV_PARAM &&
 870        inst->SrcReg[0].Index != inst->SrcReg[1].Index)
 871       RETURN_ERROR1("Can't reference two program parameter registers");
 872
 873    /* make sure we don't reference more than one vertex attribute register */
 874    if (inst->SrcReg[0].File == PROGRAM_INPUT &&
 875        inst->SrcReg[1].File == PROGRAM_INPUT &&
 876        inst->SrcReg[0].Index != inst->SrcReg[1].Index)
 877       RETURN_ERROR1("Can't reference two vertex attribute registers");
 878
 879    return GL_TRUE;
 880 }
 881
 882
 883 static GLboolean
 884 Parse_TriOpInstruction(struct parse_state *parseState,
 885                        struct vp_instruction *inst, enum vp_opcode opcode)
 886 {
 887    inst->Opcode = opcode;
 888    inst->StringPos = parseState->curLine - parseState->start;
 889
 890    /* dest reg */
 891    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 892       RETURN_ERROR;
 893
 894    /* comma */
 895    if (!Parse_String(parseState, ","))
 896       RETURN_ERROR;
 897
 898    /* first src arg */
 899    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[0]))
 900       RETURN_ERROR;
 901
 902    /* comma */
 903    if (!Parse_String(parseState, ","))
 904       RETURN_ERROR;
 905
 906    /* second src arg */
 907    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[1]))
 908       RETURN_ERROR;
 909
 910    /* comma */
 911    if (!Parse_String(parseState, ","))
 912       RETURN_ERROR;
 913
 914    /* third src arg */
 915    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[2]))
 916       RETURN_ERROR;
 917
 918    /* semicolon */
 919    if (!Parse_String(parseState, ";"))
 920       RETURN_ERROR;
 921
 922    /* make sure we don't reference more than one program parameter register */
 923    if ((inst->SrcReg[0].File == PROGRAM_ENV_PARAM &&
 924         inst->SrcReg[1].File == PROGRAM_ENV_PARAM &&
 925         inst->SrcReg[0].Index != inst->SrcReg[1].Index) ||
 926        (inst->SrcReg[0].File == PROGRAM_ENV_PARAM &&
 927         inst->SrcReg[2].File == PROGRAM_ENV_PARAM &&
 928         inst->SrcReg[0].Index != inst->SrcReg[2].Index) ||
 929        (inst->SrcReg[1].File == PROGRAM_ENV_PARAM &&
 930         inst->SrcReg[2].File == PROGRAM_ENV_PARAM &&
 931         inst->SrcReg[1].Index != inst->SrcReg[2].Index))
 932       RETURN_ERROR1("Can only reference one program register");
 933
 934    /* make sure we don't reference more than one vertex attribute register */
 935    if ((inst->SrcReg[0].File == PROGRAM_INPUT &&
 936         inst->SrcReg[1].File == PROGRAM_INPUT &&
 937         inst->SrcReg[0].Index != inst->SrcReg[1].Index) ||
 938        (inst->SrcReg[0].File == PROGRAM_INPUT &&
 939         inst->SrcReg[2].File == PROGRAM_INPUT &&
 940         inst->SrcReg[0].Index != inst->SrcReg[2].Index) ||
 941        (inst->SrcReg[1].File == PROGRAM_INPUT &&
 942         inst->SrcReg[2].File == PROGRAM_INPUT &&
 943         inst->SrcReg[1].Index != inst->SrcReg[2].Index))
 944       RETURN_ERROR1("Can only reference one input register");
 945
 946    return GL_TRUE;
 947 }
 948
 949
 950 static GLboolean
 951 Parse_ScalarInstruction(struct parse_state *parseState,
 952                         struct vp_instruction *inst, enum vp_opcode opcode)
 953 {
 954    if (opcode == VP_OPCODE_RCC && !parseState->isVersion1_1)
 955       RETURN_ERROR1("RCC illegal for vertex program 1.0");
 956
 957    inst->Opcode = opcode;
 958    inst->StringPos = parseState->curLine - parseState->start;
 959
 960    /* dest reg */
 961    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 962       RETURN_ERROR;
 963
 964    /* comma */
 965    if (!Parse_String(parseState, ","))
 966       RETURN_ERROR;
 967
 968    /* first src arg */
 969    if (!Parse_ScalarSrcReg(parseState, &inst->SrcReg[0]))
 970       RETURN_ERROR;
 971
 972    /* semicolon */
 973    if (!Parse_String(parseState, ";"))
 974       RETURN_ERROR;
 975
 976    return GL_TRUE;
 977 }
 978
 979
 980 static GLboolean
 981 Parse_AddressInstruction(struct parse_state *parseState, struct vp_instruction *inst)
 982 {
 983    inst->Opcode = VP_OPCODE_ARL;
 984    inst->StringPos = parseState->curLine - parseState->start;
 985
 986    /* dest A0 reg */
 987    if (!Parse_AddrReg(parseState))
 988       RETURN_ERROR;
 989
 990    /* comma */
 991    if (!Parse_String(parseState, ","))
 992       RETURN_ERROR;
 993
 994    /* parse src reg */
 995    if (!Parse_ScalarSrcReg(parseState, &inst->SrcReg[0]))
 996       RETURN_ERROR;
 997
 998    /* semicolon */
 999    if (!Parse_String(parseState, ";"))
1000       RETURN_ERROR;
1001
1002    return GL_TRUE;
1003 }
1004
1005
1006 static GLboolean
1007 Parse_EndInstruction(struct parse_state *parseState, struct vp_instruction *inst)
1008 {
1009    GLubyte token[100];
1010
1011    inst->Opcode = VP_OPCODE_END;
1012    inst->StringPos = parseState->curLine - parseState->start;
1013
1014    /* this should fail! */
1015    if (Parse_Token(parseState, token))
1016       RETURN_ERROR2("Unexpected token after END:", token);
1017    else
1018       return GL_TRUE;
1019 }
1020
1021
1022 static GLboolean
1023 Parse_OptionSequence(struct parse_state *parseState,
1024                      struct vp_instruction program[])
1025 {
1026    while (1) {
1027       if (!Parse_String(parseState, "OPTION"))
1028          return GL_TRUE;  /* ok, not an OPTION statement */
1029       if (Parse_String(parseState, "NV_position_invariant")) {
1030          parseState->isPositionInvariant = GL_TRUE;
1031       }
1032       else {
1033          RETURN_ERROR1("unexpected OPTION statement");
1034       }
1035       if (!Parse_String(parseState, ";"))
1036          return GL_FALSE;
1037    }
1038 }
1039
1040
1041 static GLboolean
1042 Parse_InstructionSequence(struct parse_state *parseState,
1043                           struct vp_instruction program[])
1044 {
1045    while (1) {
1046       struct vp_instruction *inst = program + parseState->numInst;
1047
1048       /* Initialize the instruction */
1049       inst->SrcReg[0].File = (enum register_file) -1;
1050       inst->SrcReg[1].File = (enum register_file) -1;
1051       inst->SrcReg[2].File = (enum register_file) -1;
1052       inst->DstReg.File = (enum register_file) -1;
1053
1054       if (Parse_String(parseState, "MOV")) {
1055          if (!Parse_UnaryOpInstruction(parseState, inst, VP_OPCODE_MOV))
1056             RETURN_ERROR;
1057       }
1058       else if (Parse_String(parseState, "LIT")) {
1059          if (!Parse_UnaryOpInstruction(parseState, inst, VP_OPCODE_LIT))
1060             RETURN_ERROR;
1061       }
1062       else if (Parse_String(parseState, "ABS")) {
1063          if (!Parse_UnaryOpInstruction(parseState, inst, VP_OPCODE_ABS))
1064             RETURN_ERROR;
1065       }
1066       else if (Parse_String(parseState, "MUL")) {
1067          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_MUL))
1068             RETURN_ERROR;
1069       }
1070       else if (Parse_String(parseState, "ADD")) {
1071          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_ADD))
1072             RETURN_ERROR;
1073       }
1074       else if (Parse_String(parseState, "DP3")) {
1075          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_DP3))
1076             RETURN_ERROR;
1077       }
1078       else if (Parse_String(parseState, "DP4")) {
1079          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_DP4))
1080             RETURN_ERROR;
1081       }
1082       else if (Parse_String(parseState, "DST")) {
1083          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_DST))
1084             RETURN_ERROR;
1085       }
1086       else if (Parse_String(parseState, "MIN")) {
1087          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_MIN))
1088             RETURN_ERROR;
1089       }
1090       else if (Parse_String(parseState, "MAX")) {
1091          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_MAX))
1092             RETURN_ERROR;
1093       }
1094       else if (Parse_String(parseState, "SLT")) {
1095          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_SLT))
1096             RETURN_ERROR;
1097       }
1098       else if (Parse_String(parseState, "SGE")) {
1099          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_SGE))
1100             RETURN_ERROR;
1101       }
1102       else if (Parse_String(parseState, "DPH")) {
1103          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_DPH))
1104             RETURN_ERROR;
1105       }
1106       else if (Parse_String(parseState, "SUB")) {
1107          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_SUB))
1108             RETURN_ERROR;
1109       }
1110       else if (Parse_String(parseState, "MAD")) {
1111          if (!Parse_TriOpInstruction(parseState, inst, VP_OPCODE_MAD))
1112             RETURN_ERROR;
1113       }
1114       else if (Parse_String(parseState, "RCP")) {
1115          if (!Parse_ScalarInstruction(parseState, inst, VP_OPCODE_RCP))
1116             RETURN_ERROR;
1117       }
1118       else if (Parse_String(parseState, "RSQ")) {
1119          if (!Parse_ScalarInstruction(parseState, inst, VP_OPCODE_RSQ))
1120             RETURN_ERROR;
1121       }
1122       else if (Parse_String(parseState, "EXP")) {
1123          if (!Parse_ScalarInstruction(parseState, inst, VP_OPCODE_EXP))
1124             RETURN_ERROR;
1125       }
1126       else if (Parse_String(parseState, "LOG")) {
1127          if (!Parse_ScalarInstruction(parseState, inst, VP_OPCODE_LOG))
1128             RETURN_ERROR;
1129       }
1130       else if (Parse_String(parseState, "RCC")) {
1131          if (!Parse_ScalarInstruction(parseState, inst, VP_OPCODE_RCC))
1132             RETURN_ERROR;
1133       }
1134       else if (Parse_String(parseState, "ARL")) {
1135          if (!Parse_AddressInstruction(parseState, inst))
1136             RETURN_ERROR;
1137       }
1138       else if (Parse_String(parseState, "END")) {
1139          if (!Parse_EndInstruction(parseState, inst))
1140             RETURN_ERROR;
1141          else {
1142             parseState->numInst++;
1143             return GL_TRUE;  /* all done */
1144          }
1145       }
1146       else {
1147          /* bad instruction name */
1148          RETURN_ERROR1("Unexpected token");
1149       }
1150
1151       /* examine input/output registers */
1152       if (inst->DstReg.File == PROGRAM_OUTPUT)
1153          parseState->outputsWritten |= (1 << inst->DstReg.Index);
1154       else if (inst->DstReg.File == PROGRAM_ENV_PARAM)
1155          parseState->anyProgRegsWritten = GL_TRUE;
1156
1157       if (inst->SrcReg[0].File == PROGRAM_INPUT)
1158          parseState->inputsRead |= (1 << inst->SrcReg[0].Index);
1159       if (inst->SrcReg[1].File == PROGRAM_INPUT)
1160          parseState->inputsRead |= (1 << inst->SrcReg[1].Index);
1161       if (inst->SrcReg[2].File == PROGRAM_INPUT)
1162          parseState->inputsRead |= (1 << inst->SrcReg[2].Index);
1163
1164       parseState->numInst++;
1165
1166       if (parseState->numInst >= MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS)
1167          RETURN_ERROR1("Program too long");
1168    }
1169
1170    RETURN_ERROR;
1171 }
1172
1173
1174 static GLboolean
1175 Parse_Program(struct parse_state *parseState,
1176               struct vp_instruction instBuffer[])
1177 {
1178    if (parseState->isVersion1_1) {
1179       if (!Parse_OptionSequence(parseState, instBuffer)) {
1180          return GL_FALSE;
1181       }
1182    }
1183    return Parse_InstructionSequence(parseState, instBuffer);
1184 }
1185
1186
1187 /**
1188  * Parse/compile the 'str' returning the compiled 'program'.
1189  * ctx->Program.ErrorPos will be -1 if successful.  Otherwise, ErrorPos
1190  * indicates the position of the error in 'str'.
1191  */
1192 void
1193 _mesa_parse_nv_vertex_program(GLcontext *ctx, GLenum dstTarget,
1194                               const GLubyte *str, GLsizei len,
1195                               struct vertex_program *program)
1196 {
1197    struct parse_state parseState;
1198    struct vp_instruction instBuffer[MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS];
1199    struct vp_instruction *newInst;
1200    GLenum target;
1201    GLubyte *programString;
1202
1203    /* Make a null-terminated copy of the program string */
1204    programString = (GLubyte *) MALLOC(len + 1);
1205    if (!programString) {
1206       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glLoadProgramNV");
1207       return;
1208    }
1209    MEMCPY(programString, str, len);
1210    programString[len] = 0;
1211
1212    /* Get ready to parse */
1213    parseState.ctx = ctx;
1214    parseState.start = programString;
1215    parseState.isPositionInvariant = GL_FALSE;
1216    parseState.isVersion1_1 = GL_FALSE;
1217    parseState.numInst = 0;
1218    parseState.inputsRead = 0;
1219    parseState.outputsWritten = 0;
1220    parseState.anyProgRegsWritten = GL_FALSE;
1221
1222    /* Reset error state */
1223    _mesa_set_program_error(ctx, -1, NULL);
1224
1225    /* check the program header */
1226    if (_mesa_strncmp((const char *) programString, "!!VP1.0", 7) == 0) {
1227       target = GL_VERTEX_PROGRAM_NV;
1228       parseState.pos = programString + 7;
1229       parseState.isStateProgram = GL_FALSE;
1230    }
1231    else if (_mesa_strncmp((const char *) programString, "!!VP1.1", 7) == 0) {
1232       target = GL_VERTEX_PROGRAM_NV;
1233       parseState.pos = programString + 7;
1234       parseState.isStateProgram = GL_FALSE;
1235       parseState.isVersion1_1 = GL_TRUE;
1236    }
1237    else if (_mesa_strncmp((const char *) programString, "!!VSP1.0", 8) == 0) {
1238       target = GL_VERTEX_STATE_PROGRAM_NV;
1239       parseState.pos = programString + 8;
1240       parseState.isStateProgram = GL_TRUE;
1241    }
1242    else {
1243       /* invalid header */
1244       ctx->Program.ErrorPos = 0;
1245       _mesa_error(ctx, GL_INVALID_OPERATION, "glLoadProgramNV(bad header)");
1246       return;
1247    }
1248
1249    /* make sure target and header match */
1250    if (target != dstTarget) {
1251       _mesa_error(ctx, GL_INVALID_OPERATION,
1252                   "glLoadProgramNV(target mismatch)");
1253       return;
1254    }
1255
1256
1257    if (Parse_Program(&parseState, instBuffer)) {
1258       /* successful parse! */
1259
1260       if (parseState.isStateProgram) {
1261          if (!parseState.anyProgRegsWritten) {
1262             _mesa_error(ctx, GL_INVALID_OPERATION,
1263                         "glLoadProgramNV(c[#] not written)");
1264             return;
1265          }
1266       }
1267       else {
1268          if (!parseState.isPositionInvariant &&
1269              !(parseState.outputsWritten & 1)) {
1270             /* bit 1 = HPOS register */
1271             _mesa_error(ctx, GL_INVALID_OPERATION,
1272                         "glLoadProgramNV(HPOS not written)");
1273             return;
1274          }
1275       }
1276
1277       /* copy the compiled instructions */
1278       assert(parseState.numInst <= MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS);
1279       newInst = (struct vp_instruction *)
1280          MALLOC(parseState.numInst * sizeof(struct vp_instruction));
1281       if (!newInst) {
1282          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glLoadProgramNV");
1283          FREE(programString);
1284          return;  /* out of memory */
1285       }
1286       MEMCPY(newInst, instBuffer,
1287              parseState.numInst * sizeof(struct vp_instruction));
1288
1289       /* install the program */
1290       program->Base.Target = target;
1291       if (program->Base.String) {
1292          FREE(program->Base.String);
1293       }
1294       program->Base.String = programString;
1295       program->Base.Format = GL_PROGRAM_FORMAT_ASCII_ARB;
1296       if (program->Instructions) {
1297          FREE(program->Instructions);
1298       }
1299       program->Instructions = newInst;
1300       program->InputsRead = parseState.inputsRead;
1301       program->OutputsWritten = parseState.outputsWritten;
1302       program->IsPositionInvariant = parseState.isPositionInvariant;
1303       program->IsNVProgram = GL_TRUE;
1304
1305 #ifdef DEBUG
1306       _mesa_printf("--- glLoadProgramNV result ---\n");
1307       _mesa_print_nv_vertex_program(program);
1308       _mesa_printf("------------------------------\n");
1309 #endif
1310    }
1311    else {
1312       /* Error! */
1313       _mesa_error(ctx, GL_INVALID_OPERATION, "glLoadProgramNV");
1314       /* NOTE: _mesa_set_program_error would have been called already */
1315       /* GL_NV_vertex_program isn't supposed to set the error string
1316        * so we reset it here.
1317        */
1318       _mesa_set_program_error(ctx, ctx->Program.ErrorPos, NULL);
1319    }
1320 }
1321
1322
1323 static void
1324 PrintSrcReg(const struct vp_src_register *src)
1325 {
1326    static const char comps[5] = "xyzw";
1327    if (src->Negate)
1328       _mesa_printf("-");
1329    if (src->RelAddr) {
1330       if (src->Index > 0)
1331          _mesa_printf("c[A0.x + %d]", src->Index);
1332       else if (src->Index < 0)
1333          _mesa_printf("c[A0.x - %d]", -src->Index);
1334       else
1335          _mesa_printf("c[A0.x]");
1336    }
1337    else if (src->File == PROGRAM_OUTPUT) {
1338       _mesa_printf("o[%s]", OutputRegisters[src->Index]);
1339    }
1340    else if (src->File == PROGRAM_INPUT) {
1341       _mesa_printf("v[%s]", InputRegisters[src->Index]);
1342    }
1343    else if (src->File == PROGRAM_ENV_PARAM) {
1344       _mesa_printf("c[%d]", src->Index);
1345    }
1346    else {
1347       ASSERT(src->File == PROGRAM_TEMPORARY);
1348       _mesa_printf("R%d", src->Index);
1349    }
1350
1351    if (src->Swizzle[0] == src->Swizzle[1] &&
1352        src->Swizzle[0] == src->Swizzle[2] &&
1353        src->Swizzle[0] == src->Swizzle[3]) {
1354       _mesa_printf(".%c", comps[src->Swizzle[0]]);
1355    }
1356    else if (src->Swizzle[0] != 0 ||
1357             src->Swizzle[1] != 1 ||
1358             src->Swizzle[2] != 2 ||
1359             src->Swizzle[3] != 3) {
1360       _mesa_printf(".%c%c%c%c",
1361              comps[src->Swizzle[0]],
1362              comps[src->Swizzle[1]],
1363              comps[src->Swizzle[2]],
1364              comps[src->Swizzle[3]]);
1365    }
1366 }
1367
1368
1369 static void
1370 PrintDstReg(const struct vp_dst_register *dst)
1371 {
1372    GLint w = dst->WriteMask[0] + dst->WriteMask[1]
1373            + dst->WriteMask[2] + dst->WriteMask[3];
1374
1375    if (dst->File == PROGRAM_OUTPUT) {
1376       _mesa_printf("o[%s]", OutputRegisters[dst->Index]);
1377    }
1378    else if (dst->File == PROGRAM_INPUT) {
1379       _mesa_printf("v[%s]", InputRegisters[dst->Index]);
1380    }
1381    else if (dst->File == PROGRAM_ENV_PARAM) {
1382       _mesa_printf("c[%d]", dst->Index);
1383    }
1384    else {
1385       ASSERT(dst->File == PROGRAM_TEMPORARY);
1386       _mesa_printf("R%d", dst->Index);
1387    }
1388
1389    if (w != 0 && w != 4) {
1390       _mesa_printf(".");
1391       if (dst->WriteMask[0])
1392          _mesa_printf("x");
1393       if (dst->WriteMask[1])
1394          _mesa_printf("y");
1395       if (dst->WriteMask[2])
1396          _mesa_printf("z");
1397       if (dst->WriteMask[3])
1398          _mesa_printf("w");
1399    }
1400 }
1401
1402
1403 /**
1404  * Print a single NVIDIA vertex program instruction.
1405  */
1406 void
1407 _mesa_print_nv_vertex_instruction(const struct vp_instruction *inst)
1408 {
1409    switch (inst->Opcode) {
1410       case VP_OPCODE_MOV:
1411       case VP_OPCODE_LIT:
1412       case VP_OPCODE_RCP:
1413       case VP_OPCODE_RSQ:
1414       case VP_OPCODE_EXP:
1415       case VP_OPCODE_LOG:
1416       case VP_OPCODE_RCC:
1417       case VP_OPCODE_ABS:
1418          _mesa_printf("%s ", Opcodes[(int) inst->Opcode]);
1419          PrintDstReg(&inst->DstReg);
1420          _mesa_printf(", ");
1421          PrintSrcReg(&inst->SrcReg[0]);
1422          _mesa_printf(";\n");
1423          break;
1424       case VP_OPCODE_MUL:
1425       case VP_OPCODE_ADD:
1426       case VP_OPCODE_DP3:
1427       case VP_OPCODE_DP4:
1428       case VP_OPCODE_DST:
1429       case VP_OPCODE_MIN:
1430       case VP_OPCODE_MAX:
1431       case VP_OPCODE_SLT:
1432       case VP_OPCODE_SGE:
1433       case VP_OPCODE_DPH:
1434       case VP_OPCODE_SUB:
1435          _mesa_printf("%s ", Opcodes[(int) inst->Opcode]);
1436          PrintDstReg(&inst->DstReg);
1437          _mesa_printf(", ");
1438          PrintSrcReg(&inst->SrcReg[0]);
1439          _mesa_printf(", ");
1440          PrintSrcReg(&inst->SrcReg[1]);
1441          _mesa_printf(";\n");
1442          break;
1443       case VP_OPCODE_MAD:
1444          _mesa_printf("MAD ");
1445          PrintDstReg(&inst->DstReg);
1446          _mesa_printf(", ");
1447          PrintSrcReg(&inst->SrcReg[0]);
1448          _mesa_printf(", ");
1449          PrintSrcReg(&inst->SrcReg[1]);
1450          _mesa_printf(", ");
1451          PrintSrcReg(&inst->SrcReg[2]);
1452          _mesa_printf(";\n");
1453          break;
1454       case VP_OPCODE_ARL:
1455          _mesa_printf("ARL A0.x, ");
1456          PrintSrcReg(&inst->SrcReg[0]);
1457          _mesa_printf(";\n");
1458          break;
1459       case VP_OPCODE_END:
1460          _mesa_printf("END\n");
1461          break;
1462       default:
1463          _mesa_printf("BAD INSTRUCTION\n");
1464    }
1465 }
1466
1467
1468 /**
1469  * Print (unparse) the given vertex program.  Just for debugging.
1470  */
1471 void
1472 _mesa_print_nv_vertex_program(const struct vertex_program *program)
1473 {
1474    const struct vp_instruction *inst;
1475
1476    for (inst = program->Instructions; ; inst++) {
1477       _mesa_print_nv_vertex_instruction(inst);
1478       if (inst->Opcode == VP_OPCODE_END)
1479          return;
1480    }
1481 }
1482
1483
1484 const char *
1485 _mesa_nv_vertex_input_register_name(GLuint i)
1486 {
1487    ASSERT(i < MAX_NV_VERTEX_PROGRAM_INPUTS);
1488    return InputRegisters[i];
1489 }
1490
1491
1492 const char *
1493 _mesa_nv_vertex_output_register_name(GLuint i)
1494 {
1495    ASSERT(i < MAX_NV_VERTEX_PROGRAM_OUTPUTS);
1496    return OutputRegisters[i];
1497 }