src/mesa/main/nvvertparse.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  5.1
   4  *
   5  * Copyright (C) 1999-2003  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       /* absolute program parameter register */
 583       dstReg->File = PROGRAM_ENV_PARAM;
 584       if (!Parse_AbsParamReg(parseState, &dstReg->Index))
 585          RETURN_ERROR;
 586    }
 587    else {
 588       RETURN_ERROR1("Bad destination register name");
 589    }
 590
 591    /* Parse optional write mask */
 592    if (!Peek_Token(parseState, token))
 593       RETURN_ERROR;
 594
 595    if (token[0] == '.') {
 596       /* got a mask */
 597       GLint k = 0;
 598
 599       if (!Parse_String(parseState, "."))
 600          RETURN_ERROR;
 601
 602       if (!Parse_Token(parseState, token))
 603          RETURN_ERROR;
 604
 605       dstReg->WriteMask[0] = GL_FALSE;
 606       dstReg->WriteMask[1] = GL_FALSE;
 607       dstReg->WriteMask[2] = GL_FALSE;
 608       dstReg->WriteMask[3] = GL_FALSE;
 609
 610       if (token[k] == 'x') {
 611          dstReg->WriteMask[0] = GL_TRUE;
 612          k++;
 613       }
 614       if (token[k] == 'y') {
 615          dstReg->WriteMask[1] = GL_TRUE;
 616          k++;
 617       }
 618       if (token[k] == 'z') {
 619          dstReg->WriteMask[2] = GL_TRUE;
 620          k++;
 621       }
 622       if (token[k] == 'w') {
 623          dstReg->WriteMask[3] = GL_TRUE;
 624          k++;
 625       }
 626       if (k == 0) {
 627          RETURN_ERROR1("Bad writemask character");
 628       }
 629       return GL_TRUE;
 630    }
 631    else {
 632       dstReg->WriteMask[0] = GL_TRUE;
 633       dstReg->WriteMask[1] = GL_TRUE;
 634       dstReg->WriteMask[2] = GL_TRUE;
 635       dstReg->WriteMask[3] = GL_TRUE;
 636       return GL_TRUE;
 637    }
 638 }
 639
 640
 641 static GLboolean
 642 Parse_SwizzleSrcReg(struct parse_state *parseState, struct vp_src_register *srcReg)
 643 {
 644    GLubyte token[100];
 645
 646    srcReg->RelAddr = GL_FALSE;
 647
 648    /* check for '-' */
 649    if (!Peek_Token(parseState, token))
 650       RETURN_ERROR;
 651    if (token[0] == '-') {
 652       (void) Parse_String(parseState, "-");
 653       srcReg->Negate = GL_TRUE;
 654       if (!Peek_Token(parseState, token))
 655          RETURN_ERROR;
 656    }
 657    else {
 658       srcReg->Negate = GL_FALSE;
 659    }
 660
 661    /* Src reg can be R<n>, c[n], c[n +/- offset], or a named vertex attrib */
 662    if (token[0] == 'R') {
 663       srcReg->File = PROGRAM_TEMPORARY;
 664       if (!Parse_TempReg(parseState, &srcReg->Index))
 665          RETURN_ERROR;
 666    }
 667    else if (token[0] == 'c') {
 668       if (!Parse_ParamReg(parseState, srcReg))
 669          RETURN_ERROR;
 670    }
 671    else if (token[0] == 'v') {
 672       srcReg->File = PROGRAM_INPUT;
 673       if (!Parse_AttribReg(parseState, &srcReg->Index))
 674          RETURN_ERROR;
 675    }
 676    else {
 677       RETURN_ERROR2("Bad source register name", token);
 678    }
 679
 680    /* init swizzle fields */
 681    srcReg->Swizzle[0] = 0;
 682    srcReg->Swizzle[1] = 1;
 683    srcReg->Swizzle[2] = 2;
 684    srcReg->Swizzle[3] = 3;
 685
 686    /* Look for optional swizzle suffix */
 687    if (!Peek_Token(parseState, token))
 688       RETURN_ERROR;
 689    if (token[0] == '.') {
 690       (void) Parse_String(parseState, ".");  /* consume . */
 691
 692       if (!Parse_Token(parseState, token))
 693          RETURN_ERROR;
 694
 695       if (token[1] == 0) {
 696          /* single letter swizzle */
 697          if (token[0] == 'x')
 698             ASSIGN_4V(srcReg->Swizzle, 0, 0, 0, 0);
 699          else if (token[0] == 'y')
 700             ASSIGN_4V(srcReg->Swizzle, 1, 1, 1, 1);
 701          else if (token[0] == 'z')
 702             ASSIGN_4V(srcReg->Swizzle, 2, 2, 2, 2);
 703          else if (token[0] == 'w')
 704             ASSIGN_4V(srcReg->Swizzle, 3, 3, 3, 3);
 705          else
 706             RETURN_ERROR1("Expected x, y, z, or w");
 707       }
 708       else {
 709          /* 2, 3 or 4-component swizzle */
 710          GLint k;
 711          for (k = 0; token[k] && k < 5; k++) {
 712             if (token[k] == 'x')
 713                srcReg->Swizzle[k] = 0;
 714             else if (token[k] == 'y')
 715                srcReg->Swizzle[k] = 1;
 716             else if (token[k] == 'z')
 717                srcReg->Swizzle[k] = 2;
 718             else if (token[k] == 'w')
 719                srcReg->Swizzle[k] = 3;
 720             else
 721                RETURN_ERROR;
 722          }
 723          if (k >= 5)
 724             RETURN_ERROR;
 725       }
 726    }
 727
 728    return GL_TRUE;
 729 }
 730
 731
 732 static GLboolean
 733 Parse_ScalarSrcReg(struct parse_state *parseState, struct vp_src_register *srcReg)
 734 {
 735    GLubyte token[100];
 736
 737    srcReg->RelAddr = GL_FALSE;
 738
 739    /* check for '-' */
 740    if (!Peek_Token(parseState, token))
 741       RETURN_ERROR;
 742    if (token[0] == '-') {
 743       srcReg->Negate = GL_TRUE;
 744       (void) Parse_String(parseState, "-"); /* consume '-' */
 745       if (!Peek_Token(parseState, token))
 746          RETURN_ERROR;
 747    }
 748    else {
 749       srcReg->Negate = GL_FALSE;
 750    }
 751
 752    /* Src reg can be R<n>, c[n], c[n +/- offset], or a named vertex attrib */
 753    if (token[0] == 'R') {
 754       srcReg->File = PROGRAM_TEMPORARY;
 755       if (!Parse_TempReg(parseState, &srcReg->Index))
 756          RETURN_ERROR;
 757    }
 758    else if (token[0] == 'c') {
 759       if (!Parse_ParamReg(parseState, srcReg))
 760          RETURN_ERROR;
 761    }
 762    else if (token[0] == 'v') {
 763       srcReg->File = PROGRAM_INPUT;
 764       if (!Parse_AttribReg(parseState, &srcReg->Index))
 765          RETURN_ERROR;
 766    }
 767    else {
 768       RETURN_ERROR2("Bad source register name", token);
 769    }
 770
 771    /* Look for .[xyzw] suffix */
 772    if (!Parse_String(parseState, "."))
 773       RETURN_ERROR;
 774
 775    if (!Parse_Token(parseState, token))
 776       RETURN_ERROR;
 777
 778    if (token[0] == 'x' && token[1] == 0) {
 779       srcReg->Swizzle[0] = 0;
 780    }
 781    else if (token[0] == 'y' && token[1] == 0) {
 782       srcReg->Swizzle[0] = 1;
 783    }
 784    else if (token[0] == 'z' && token[1] == 0) {
 785       srcReg->Swizzle[0] = 2;
 786    }
 787    else if (token[0] == 'w' && token[1] == 0) {
 788       srcReg->Swizzle[0] = 3;
 789    }
 790    else {
 791       RETURN_ERROR1("Bad scalar source suffix");
 792    }
 793    srcReg->Swizzle[1] = srcReg->Swizzle[2] = srcReg->Swizzle[3] = 0;
 794
 795    return GL_TRUE;
 796 }
 797
 798
 799 static GLint
 800 Parse_UnaryOpInstruction(struct parse_state *parseState,
 801                          struct vp_instruction *inst, enum vp_opcode opcode)
 802 {
 803    if (opcode == VP_OPCODE_ABS && !parseState->isVersion1_1)
 804       RETURN_ERROR1("ABS illegal for vertex program 1.0");
 805
 806    inst->Opcode = opcode;
 807    inst->StringPos = parseState->curLine - parseState->start;
 808
 809    /* dest reg */
 810    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 811       RETURN_ERROR;
 812
 813    /* comma */
 814    if (!Parse_String(parseState, ","))
 815       RETURN_ERROR;
 816
 817    /* src arg */
 818    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[0]))
 819       RETURN_ERROR;
 820
 821    /* semicolon */
 822    if (!Parse_String(parseState, ";"))
 823       RETURN_ERROR;
 824
 825    return GL_TRUE;
 826 }
 827
 828
 829 static GLboolean
 830 Parse_BiOpInstruction(struct parse_state *parseState,
 831                       struct vp_instruction *inst, enum vp_opcode opcode)
 832 {
 833    if (opcode == VP_OPCODE_DPH && !parseState->isVersion1_1)
 834       RETURN_ERROR1("DPH illegal for vertex program 1.0");
 835    if (opcode == VP_OPCODE_SUB && !parseState->isVersion1_1)
 836       RETURN_ERROR1("SUB illegal for vertex program 1.0");
 837
 838    inst->Opcode = opcode;
 839    inst->StringPos = parseState->curLine - parseState->start;
 840
 841    /* dest reg */
 842    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 843       RETURN_ERROR;
 844
 845    /* comma */
 846    if (!Parse_String(parseState, ","))
 847       RETURN_ERROR;
 848
 849    /* first src arg */
 850    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[0]))
 851       RETURN_ERROR;
 852
 853    /* comma */
 854    if (!Parse_String(parseState, ","))
 855       RETURN_ERROR;
 856
 857    /* second src arg */
 858    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[1]))
 859       RETURN_ERROR;
 860
 861    /* semicolon */
 862    if (!Parse_String(parseState, ";"))
 863       RETURN_ERROR;
 864
 865    /* make sure we don't reference more than one program parameter register */
 866    if (inst->SrcReg[0].File == PROGRAM_ENV_PARAM &&
 867        inst->SrcReg[1].File == PROGRAM_ENV_PARAM &&
 868        inst->SrcReg[0].Index != inst->SrcReg[1].Index)
 869       RETURN_ERROR1("Can't reference two program parameter registers");
 870
 871    /* make sure we don't reference more than one vertex attribute register */
 872    if (inst->SrcReg[0].File == PROGRAM_INPUT &&
 873        inst->SrcReg[1].File == PROGRAM_INPUT &&
 874        inst->SrcReg[0].Index != inst->SrcReg[1].Index)
 875       RETURN_ERROR1("Can't reference two vertex attribute registers");
 876
 877    return GL_TRUE;
 878 }
 879
 880
 881 static GLboolean
 882 Parse_TriOpInstruction(struct parse_state *parseState,
 883                        struct vp_instruction *inst, enum vp_opcode opcode)
 884 {
 885    inst->Opcode = opcode;
 886    inst->StringPos = parseState->curLine - parseState->start;
 887
 888    /* dest reg */
 889    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 890       RETURN_ERROR;
 891
 892    /* comma */
 893    if (!Parse_String(parseState, ","))
 894       RETURN_ERROR;
 895
 896    /* first src arg */
 897    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[0]))
 898       RETURN_ERROR;
 899
 900    /* comma */
 901    if (!Parse_String(parseState, ","))
 902       RETURN_ERROR;
 903
 904    /* second src arg */
 905    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[1]))
 906       RETURN_ERROR;
 907
 908    /* comma */
 909    if (!Parse_String(parseState, ","))
 910       RETURN_ERROR;
 911
 912    /* third src arg */
 913    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[2]))
 914       RETURN_ERROR;
 915
 916    /* semicolon */
 917    if (!Parse_String(parseState, ";"))
 918       RETURN_ERROR;
 919
 920    /* make sure we don't reference more than one program parameter register */
 921    if ((inst->SrcReg[0].File == PROGRAM_ENV_PARAM &&
 922         inst->SrcReg[1].File == PROGRAM_ENV_PARAM &&
 923         inst->SrcReg[0].Index != inst->SrcReg[1].Index) ||
 924        (inst->SrcReg[0].File == PROGRAM_ENV_PARAM &&
 925         inst->SrcReg[2].File == PROGRAM_ENV_PARAM &&
 926         inst->SrcReg[0].Index != inst->SrcReg[2].Index) ||
 927        (inst->SrcReg[1].File == PROGRAM_ENV_PARAM &&
 928         inst->SrcReg[2].File == PROGRAM_ENV_PARAM &&
 929         inst->SrcReg[1].Index != inst->SrcReg[2].Index))
 930       RETURN_ERROR1("Can only reference one program register");
 931
 932    /* make sure we don't reference more than one vertex attribute register */
 933    if ((inst->SrcReg[0].File == PROGRAM_INPUT &&
 934         inst->SrcReg[1].File == PROGRAM_INPUT &&
 935         inst->SrcReg[0].Index != inst->SrcReg[1].Index) ||
 936        (inst->SrcReg[0].File == PROGRAM_INPUT &&
 937         inst->SrcReg[2].File == PROGRAM_INPUT &&
 938         inst->SrcReg[0].Index != inst->SrcReg[2].Index) ||
 939        (inst->SrcReg[1].File == PROGRAM_INPUT &&
 940         inst->SrcReg[2].File == PROGRAM_INPUT &&
 941         inst->SrcReg[1].Index != inst->SrcReg[2].Index))
 942       RETURN_ERROR1("Can only reference one input register");
 943
 944    return GL_TRUE;
 945 }
 946
 947
 948 static GLboolean
 949 Parse_ScalarInstruction(struct parse_state *parseState,
 950                         struct vp_instruction *inst, enum vp_opcode opcode)
 951 {
 952    if (opcode == VP_OPCODE_RCC && !parseState->isVersion1_1)
 953       RETURN_ERROR1("RCC illegal for vertex program 1.0");
 954
 955    inst->Opcode = opcode;
 956    inst->StringPos = parseState->curLine - parseState->start;
 957
 958    /* dest reg */
 959    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 960       RETURN_ERROR;
 961
 962    /* comma */
 963    if (!Parse_String(parseState, ","))
 964       RETURN_ERROR;
 965
 966    /* first src arg */
 967    if (!Parse_ScalarSrcReg(parseState, &inst->SrcReg[0]))
 968       RETURN_ERROR;
 969
 970    /* semicolon */
 971    if (!Parse_String(parseState, ";"))
 972       RETURN_ERROR;
 973
 974    return GL_TRUE;
 975 }
 976
 977
 978 static GLboolean
 979 Parse_AddressInstruction(struct parse_state *parseState, struct vp_instruction *inst)
 980 {
 981    inst->Opcode = VP_OPCODE_ARL;
 982    inst->StringPos = parseState->curLine - parseState->start;
 983
 984    /* dest A0 reg */
 985    if (!Parse_AddrReg(parseState))
 986       RETURN_ERROR;
 987
 988    /* comma */
 989    if (!Parse_String(parseState, ","))
 990       RETURN_ERROR;
 991
 992    /* parse src reg */
 993    if (!Parse_ScalarSrcReg(parseState, &inst->SrcReg[0]))
 994       RETURN_ERROR;
 995
 996    /* semicolon */
 997    if (!Parse_String(parseState, ";"))
 998       RETURN_ERROR;
 999
1000    return GL_TRUE;
1001 }
1002
1003
1004 static GLboolean
1005 Parse_EndInstruction(struct parse_state *parseState, struct vp_instruction *inst)
1006 {
1007    GLubyte token[100];
1008
1009    inst->Opcode = VP_OPCODE_END;
1010    inst->StringPos = parseState->curLine - parseState->start;
1011
1012    /* this should fail! */
1013    if (Parse_Token(parseState, token))
1014       RETURN_ERROR2("Unexpected token after END:", token);
1015    else
1016       return GL_TRUE;
1017 }
1018
1019
1020 static GLboolean
1021 Parse_OptionSequence(struct parse_state *parseState,
1022                      struct vp_instruction program[])
1023 {
1024    while (1) {
1025       if (!Parse_String(parseState, "OPTION"))
1026          return GL_TRUE;  /* ok, not an OPTION statement */
1027       if (Parse_String(parseState, "NV_position_invariant")) {
1028          parseState->isPositionInvariant = GL_TRUE;
1029       }
1030       else {
1031          RETURN_ERROR1("unexpected OPTION statement");
1032       }
1033       if (!Parse_String(parseState, ";"))
1034          return GL_FALSE;
1035    }
1036 }
1037
1038
1039 static GLboolean
1040 Parse_InstructionSequence(struct parse_state *parseState,
1041                           struct vp_instruction program[])
1042 {
1043    while (1) {
1044       struct vp_instruction *inst = program + parseState->numInst;
1045
1046       /* Initialize the instruction */
1047       inst->SrcReg[0].File = (enum register_file) -1;
1048       inst->SrcReg[1].File = (enum register_file) -1;
1049       inst->SrcReg[2].File = (enum register_file) -1;
1050       inst->DstReg.File = (enum register_file) -1;
1051
1052       if (Parse_String(parseState, "MOV")) {
1053          if (!Parse_UnaryOpInstruction(parseState, inst, VP_OPCODE_MOV))
1054             RETURN_ERROR;
1055       }
1056       else if (Parse_String(parseState, "LIT")) {
1057          if (!Parse_UnaryOpInstruction(parseState, inst, VP_OPCODE_LIT))
1058             RETURN_ERROR;
1059       }
1060       else if (Parse_String(parseState, "ABS")) {
1061          if (!Parse_UnaryOpInstruction(parseState, inst, VP_OPCODE_ABS))
1062             RETURN_ERROR;
1063       }
1064       else if (Parse_String(parseState, "MUL")) {
1065          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_MUL))
1066             RETURN_ERROR;
1067       }
1068       else if (Parse_String(parseState, "ADD")) {
1069          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_ADD))
1070             RETURN_ERROR;
1071       }
1072       else if (Parse_String(parseState, "DP3")) {
1073          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_DP3))
1074             RETURN_ERROR;
1075       }
1076       else if (Parse_String(parseState, "DP4")) {
1077          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_DP4))
1078             RETURN_ERROR;
1079       }
1080       else if (Parse_String(parseState, "DST")) {
1081          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_DST))
1082             RETURN_ERROR;
1083       }
1084       else if (Parse_String(parseState, "MIN")) {
1085          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_MIN))
1086             RETURN_ERROR;
1087       }
1088       else if (Parse_String(parseState, "MAX")) {
1089          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_MAX))
1090             RETURN_ERROR;
1091       }
1092       else if (Parse_String(parseState, "SLT")) {
1093          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_SLT))
1094             RETURN_ERROR;
1095       }
1096       else if (Parse_String(parseState, "SGE")) {
1097          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_SGE))
1098             RETURN_ERROR;
1099       }
1100       else if (Parse_String(parseState, "DPH")) {
1101          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_DPH))
1102             RETURN_ERROR;
1103       }
1104       else if (Parse_String(parseState, "SUB")) {
1105          if (!Parse_BiOpInstruction(parseState, inst, VP_OPCODE_SUB))
1106             RETURN_ERROR;
1107       }
1108       else if (Parse_String(parseState, "MAD")) {
1109          if (!Parse_TriOpInstruction(parseState, inst, VP_OPCODE_MAD))
1110             RETURN_ERROR;
1111       }
1112       else if (Parse_String(parseState, "RCP")) {
1113          if (!Parse_ScalarInstruction(parseState, inst, VP_OPCODE_RCP))
1114             RETURN_ERROR;
1115       }
1116       else if (Parse_String(parseState, "RSQ")) {
1117          if (!Parse_ScalarInstruction(parseState, inst, VP_OPCODE_RSQ))
1118             RETURN_ERROR;
1119       }
1120       else if (Parse_String(parseState, "EXP")) {
1121          if (!Parse_ScalarInstruction(parseState, inst, VP_OPCODE_EXP))
1122             RETURN_ERROR;
1123       }
1124       else if (Parse_String(parseState, "LOG")) {
1125          if (!Parse_ScalarInstruction(parseState, inst, VP_OPCODE_LOG))
1126             RETURN_ERROR;
1127       }
1128       else if (Parse_String(parseState, "RCC")) {
1129          if (!Parse_ScalarInstruction(parseState, inst, VP_OPCODE_RCC))
1130             RETURN_ERROR;
1131       }
1132       else if (Parse_String(parseState, "ARL")) {
1133          if (!Parse_AddressInstruction(parseState, inst))
1134             RETURN_ERROR;
1135       }
1136       else if (Parse_String(parseState, "END")) {
1137          if (!Parse_EndInstruction(parseState, inst))
1138             RETURN_ERROR;
1139          else {
1140             parseState->numInst++;
1141             return GL_TRUE;  /* all done */
1142          }
1143       }
1144       else {
1145          /* bad instruction name */
1146          RETURN_ERROR1("Unexpected token");
1147       }
1148
1149       /* examine input/output registers */
1150       if (inst->DstReg.File == PROGRAM_OUTPUT)
1151          parseState->outputsWritten |= (1 << inst->DstReg.Index);
1152       else if (inst->DstReg.File == PROGRAM_ENV_PARAM)
1153          parseState->anyProgRegsWritten = GL_TRUE;
1154
1155       if (inst->SrcReg[0].File == PROGRAM_INPUT)
1156          parseState->inputsRead |= (1 << inst->SrcReg[0].Index);
1157       if (inst->SrcReg[1].File == PROGRAM_INPUT)
1158          parseState->inputsRead |= (1 << inst->SrcReg[1].Index);
1159       if (inst->SrcReg[2].File == PROGRAM_INPUT)
1160          parseState->inputsRead |= (1 << inst->SrcReg[2].Index);
1161
1162       parseState->numInst++;
1163
1164       if (parseState->numInst >= MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS)
1165          RETURN_ERROR1("Program too long");
1166    }
1167
1168    RETURN_ERROR;
1169 }
1170
1171
1172 static GLboolean
1173 Parse_Program(struct parse_state *parseState,
1174               struct vp_instruction instBuffer[])
1175 {
1176    if (parseState->isVersion1_1) {
1177       if (!Parse_OptionSequence(parseState, instBuffer)) {
1178          return GL_FALSE;
1179       }
1180    }
1181    return Parse_InstructionSequence(parseState, instBuffer);
1182 }
1183
1184
1185 /**
1186  * Parse/compile the 'str' returning the compiled 'program'.
1187  * ctx->Program.ErrorPos will be -1 if successful.  Otherwise, ErrorPos
1188  * indicates the position of the error in 'str'.
1189  */
1190 void
1191 _mesa_parse_nv_vertex_program(GLcontext *ctx, GLenum dstTarget,
1192                               const GLubyte *str, GLsizei len,
1193                               struct vertex_program *program)
1194 {
1195    struct parse_state parseState;
1196    struct vp_instruction instBuffer[MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS];
1197    struct vp_instruction *newInst;
1198    GLenum target;
1199    GLubyte *programString;
1200
1201    /* Make a null-terminated copy of the program string */
1202    programString = (GLubyte *) MALLOC(len + 1);
1203    if (!programString) {
1204       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glLoadProgramNV");
1205       return;
1206    }
1207    MEMCPY(programString, str, len);
1208    programString[len] = 0;
1209
1210    /* Get ready to parse */
1211    parseState.ctx = ctx;
1212    parseState.start = programString;
1213    parseState.isPositionInvariant = GL_FALSE;
1214    parseState.isVersion1_1 = GL_FALSE;
1215    parseState.numInst = 0;
1216    parseState.inputsRead = 0;
1217    parseState.outputsWritten = 0;
1218    parseState.anyProgRegsWritten = GL_FALSE;
1219
1220    /* Reset error state */
1221    _mesa_set_program_error(ctx, -1, NULL);
1222
1223    /* check the program header */
1224    if (_mesa_strncmp((const char *) programString, "!!VP1.0", 7) == 0) {
1225       target = GL_VERTEX_PROGRAM_NV;
1226       parseState.pos = programString + 7;
1227       parseState.isStateProgram = GL_FALSE;
1228    }
1229    else if (_mesa_strncmp((const char *) programString, "!!VP1.1", 7) == 0) {
1230       target = GL_VERTEX_PROGRAM_NV;
1231       parseState.pos = programString + 7;
1232       parseState.isStateProgram = GL_FALSE;
1233       parseState.isVersion1_1 = GL_TRUE;
1234    }
1235    else if (_mesa_strncmp((const char *) programString, "!!VSP1.0", 8) == 0) {
1236       target = GL_VERTEX_STATE_PROGRAM_NV;
1237       parseState.pos = programString + 8;
1238       parseState.isStateProgram = GL_TRUE;
1239    }
1240    else {
1241       /* invalid header */
1242       ctx->Program.ErrorPos = 0;
1243       _mesa_error(ctx, GL_INVALID_OPERATION, "glLoadProgramNV(bad header)");
1244       return;
1245    }
1246
1247    /* make sure target and header match */
1248    if (target != dstTarget) {
1249       _mesa_error(ctx, GL_INVALID_OPERATION,
1250                   "glLoadProgramNV(target mismatch)");
1251       return;
1252    }
1253
1254
1255    if (Parse_Program(&parseState, instBuffer)) {
1256       /* successful parse! */
1257
1258       if (parseState.isStateProgram) {
1259          if (!parseState.anyProgRegsWritten) {
1260             _mesa_error(ctx, GL_INVALID_OPERATION,
1261                         "glLoadProgramNV(c[#] not written)");
1262             return;
1263          }
1264       }
1265       else {
1266          if (!parseState.isPositionInvariant &&
1267              !(parseState.outputsWritten & 1)) {
1268             /* bit 1 = HPOS register */
1269             _mesa_error(ctx, GL_INVALID_OPERATION,
1270                         "glLoadProgramNV(HPOS not written)");
1271             return;
1272          }
1273       }
1274
1275       /* copy the compiled instructions */
1276       assert(parseState.numInst <= MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS);
1277       newInst = (struct vp_instruction *)
1278          MALLOC(parseState.numInst * sizeof(struct vp_instruction));
1279       if (!newInst) {
1280          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glLoadProgramNV");
1281          FREE(programString);
1282          return;  /* out of memory */
1283       }
1284       MEMCPY(newInst, instBuffer,
1285              parseState.numInst * sizeof(struct vp_instruction));
1286
1287       /* install the program */
1288       program->Base.Target = target;
1289       if (program->Base.String) {
1290          FREE(program->Base.String);
1291       }
1292       program->Base.String = programString;
1293       program->Base.Format = GL_PROGRAM_FORMAT_ASCII_ARB;
1294       if (program->Instructions) {
1295          FREE(program->Instructions);
1296       }
1297       program->Instructions = newInst;
1298       program->InputsRead = parseState.inputsRead;
1299       program->OutputsWritten = parseState.outputsWritten;
1300       program->IsPositionInvariant = parseState.isPositionInvariant;
1301
1302 #ifdef DEBUG
1303       _mesa_printf("--- glLoadProgramNV result ---\n");
1304       _mesa_print_nv_vertex_program(program);
1305       _mesa_printf("------------------------------\n");
1306 #endif
1307    }
1308    else {
1309       /* Error! */
1310       _mesa_error(ctx, GL_INVALID_OPERATION, "glLoadProgramNV");
1311       /* NOTE: _mesa_set_program_error would have been called already */
1312       /* GL_NV_vertex_program isn't supposed to set the error string
1313        * so we reset it here.
1314        */
1315       _mesa_set_program_error(ctx, ctx->Program.ErrorPos, NULL);
1316    }
1317 }
1318
1319
1320 static void
1321 PrintSrcReg(const struct vp_src_register *src)
1322 {
1323    static const char comps[5] = "xyzw";
1324    if (src->Negate)
1325       _mesa_printf("-");
1326    if (src->RelAddr) {
1327       if (src->Index > 0)
1328          _mesa_printf("c[A0.x + %d]", src->Index);
1329       else if (src->Index < 0)
1330          _mesa_printf("c[A0.x - %d]", -src->Index);
1331       else
1332          _mesa_printf("c[A0.x]");
1333    }
1334    else if (src->File == PROGRAM_OUTPUT) {
1335       _mesa_printf("o[%s]", OutputRegisters[src->Index]);
1336    }
1337    else if (src->File == PROGRAM_INPUT) {
1338       _mesa_printf("v[%s]", InputRegisters[src->Index]);
1339    }
1340    else if (src->File == PROGRAM_ENV_PARAM) {
1341       _mesa_printf("c[%d]", src->Index);
1342    }
1343    else {
1344       ASSERT(src->File == PROGRAM_TEMPORARY);
1345       _mesa_printf("R%d", src->Index);
1346    }
1347
1348    if (src->Swizzle[0] == src->Swizzle[1] &&
1349        src->Swizzle[0] == src->Swizzle[2] &&
1350        src->Swizzle[0] == src->Swizzle[3]) {
1351       _mesa_printf(".%c", comps[src->Swizzle[0]]);
1352    }
1353    else if (src->Swizzle[0] != 0 ||
1354             src->Swizzle[1] != 1 ||
1355             src->Swizzle[2] != 2 ||
1356             src->Swizzle[3] != 3) {
1357       _mesa_printf(".%c%c%c%c",
1358              comps[src->Swizzle[0]],
1359              comps[src->Swizzle[1]],
1360              comps[src->Swizzle[2]],
1361              comps[src->Swizzle[3]]);
1362    }
1363 }
1364
1365
1366 static void
1367 PrintDstReg(const struct vp_dst_register *dst)
1368 {
1369    GLint w = dst->WriteMask[0] + dst->WriteMask[1]
1370            + dst->WriteMask[2] + dst->WriteMask[3];
1371
1372    if (dst->File == PROGRAM_OUTPUT) {
1373       _mesa_printf("o[%s]", OutputRegisters[dst->Index]);
1374    }
1375    else if (dst->File == PROGRAM_INPUT) {
1376       _mesa_printf("v[%s]", InputRegisters[dst->Index]);
1377    }
1378    else if (dst->File == PROGRAM_ENV_PARAM) {
1379       _mesa_printf("c[%d]", dst->Index);
1380    }
1381    else {
1382       ASSERT(dst->File == PROGRAM_TEMPORARY);
1383       _mesa_printf("R%d", dst->Index);
1384    }
1385
1386    if (w != 0 && w != 4) {
1387       _mesa_printf(".");
1388       if (dst->WriteMask[0])
1389          _mesa_printf("x");
1390       if (dst->WriteMask[1])
1391          _mesa_printf("y");
1392       if (dst->WriteMask[2])
1393          _mesa_printf("z");
1394       if (dst->WriteMask[3])
1395          _mesa_printf("w");
1396    }
1397 }
1398
1399
1400 /**
1401  * Print a single NVIDIA vertex program instruction.
1402  */
1403 void
1404 _mesa_print_nv_vertex_instruction(const struct vp_instruction *inst)
1405 {
1406    switch (inst->Opcode) {
1407       case VP_OPCODE_MOV:
1408       case VP_OPCODE_LIT:
1409       case VP_OPCODE_RCP:
1410       case VP_OPCODE_RSQ:
1411       case VP_OPCODE_EXP:
1412       case VP_OPCODE_LOG:
1413       case VP_OPCODE_RCC:
1414       case VP_OPCODE_ABS:
1415          _mesa_printf("%s ", Opcodes[(int) inst->Opcode]);
1416          PrintDstReg(&inst->DstReg);
1417          _mesa_printf(", ");
1418          PrintSrcReg(&inst->SrcReg[0]);
1419          _mesa_printf(";\n");
1420          break;
1421       case VP_OPCODE_MUL:
1422       case VP_OPCODE_ADD:
1423       case VP_OPCODE_DP3:
1424       case VP_OPCODE_DP4:
1425       case VP_OPCODE_DST:
1426       case VP_OPCODE_MIN:
1427       case VP_OPCODE_MAX:
1428       case VP_OPCODE_SLT:
1429       case VP_OPCODE_SGE:
1430       case VP_OPCODE_DPH:
1431       case VP_OPCODE_SUB:
1432          _mesa_printf("%s ", Opcodes[(int) inst->Opcode]);
1433          PrintDstReg(&inst->DstReg);
1434          _mesa_printf(", ");
1435          PrintSrcReg(&inst->SrcReg[0]);
1436          _mesa_printf(", ");
1437          PrintSrcReg(&inst->SrcReg[1]);
1438          _mesa_printf(";\n");
1439          break;
1440       case VP_OPCODE_MAD:
1441          _mesa_printf("MAD ");
1442          PrintDstReg(&inst->DstReg);
1443          _mesa_printf(", ");
1444          PrintSrcReg(&inst->SrcReg[0]);
1445          _mesa_printf(", ");
1446          PrintSrcReg(&inst->SrcReg[1]);
1447          _mesa_printf(", ");
1448          PrintSrcReg(&inst->SrcReg[2]);
1449          _mesa_printf(";\n");
1450          break;
1451       case VP_OPCODE_ARL:
1452          _mesa_printf("ARL A0.x, ");
1453          PrintSrcReg(&inst->SrcReg[0]);
1454          _mesa_printf(";\n");
1455          break;
1456       case VP_OPCODE_END:
1457          _mesa_printf("END\n");
1458          break;
1459       default:
1460          _mesa_printf("BAD INSTRUCTION\n");
1461    }
1462 }
1463
1464
1465 /**
1466  * Print (unparse) the given vertex program.  Just for debugging.
1467  */
1468 void
1469 _mesa_print_nv_vertex_program(const struct vertex_program *program)
1470 {
1471    const struct vp_instruction *inst;
1472
1473    for (inst = program->Instructions; ; inst++) {
1474       _mesa_print_nv_vertex_instruction(inst);
1475       if (inst->Opcode == VP_OPCODE_END)
1476          return;
1477    }
1478 }
1479
1480
1481 const char *
1482 _mesa_nv_vertex_input_register_name(GLuint i)
1483 {
1484    ASSERT(i < MAX_NV_VERTEX_PROGRAM_INPUTS);
1485    return InputRegisters[i];
1486 }
1487
1488
1489 const char *
1490 _mesa_nv_vertex_output_register_name(GLuint i)
1491 {
1492    ASSERT(i < MAX_NV_VERTEX_PROGRAM_OUTPUTS);
1493    return OutputRegisters[i];
1494 }