src/mesa/shader/nvvertparse.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.2
   4  *
   5  * Copyright (C) 1999-2006  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 "program_instruction.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    GLbitfield inputsRead;
  66    GLbitfield 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 = (GLint)_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", "FOGC",
 292    "TEX0", "TEX1", "TEX2", "TEX3", "TEX4", "TEX5", "TEX6", "TEX7",
 293    "PSIZ", "BFC0", "BFC1", NULL
 294 };
 295
 296
 297
 298 /**
 299  * Parse a temporary register: Rnn
 300  */
 301 static GLboolean
 302 Parse_TempReg(struct parse_state *parseState, GLint *tempRegNum)
 303 {
 304    GLubyte token[100];
 305
 306    /* Should be 'R##' */
 307    if (!Parse_Token(parseState, token))
 308       RETURN_ERROR;
 309    if (token[0] != 'R')
 310       RETURN_ERROR1("Expected R##");
 311
 312    if (IsDigit(token[1])) {
 313       GLint reg = _mesa_atoi((char *) (token + 1));
 314       if (reg >= MAX_NV_VERTEX_PROGRAM_TEMPS)
 315          RETURN_ERROR1("Bad temporary register name");
 316       *tempRegNum = reg;
 317    }
 318    else {
 319       RETURN_ERROR1("Bad temporary register name");
 320    }
 321
 322    return GL_TRUE;
 323 }
 324
 325
 326 /**
 327  * Parse address register "A0.x"
 328  */
 329 static GLboolean
 330 Parse_AddrReg(struct parse_state *parseState)
 331 {
 332    /* match 'A0' */
 333    if (!Parse_String(parseState, "A0"))
 334       RETURN_ERROR;
 335
 336    /* match '.' */
 337    if (!Parse_String(parseState, "."))
 338       RETURN_ERROR;
 339
 340    /* match 'x' */
 341    if (!Parse_String(parseState, "x"))
 342       RETURN_ERROR;
 343
 344    return GL_TRUE;
 345 }
 346
 347
 348 /**
 349  * Parse absolute program parameter register "c[##]"
 350  */
 351 static GLboolean
 352 Parse_AbsParamReg(struct parse_state *parseState, GLint *regNum)
 353 {
 354    GLubyte token[100];
 355
 356    if (!Parse_String(parseState, "c"))
 357       RETURN_ERROR;
 358
 359    if (!Parse_String(parseState, "["))
 360       RETURN_ERROR;
 361
 362    if (!Parse_Token(parseState, token))
 363       RETURN_ERROR;
 364
 365    if (IsDigit(token[0])) {
 366       /* a numbered program parameter register */
 367       GLint reg = _mesa_atoi((char *) token);
 368       if (reg >= MAX_NV_VERTEX_PROGRAM_PARAMS)
 369          RETURN_ERROR1("Bad program parameter number");
 370       *regNum = reg;
 371    }
 372    else {
 373       RETURN_ERROR;
 374    }
 375
 376    if (!Parse_String(parseState, "]"))
 377       RETURN_ERROR;
 378
 379    return GL_TRUE;
 380 }
 381
 382
 383 static GLboolean
 384 Parse_ParamReg(struct parse_state *parseState, struct prog_src_register *srcReg)
 385 {
 386    GLubyte token[100];
 387
 388    if (!Parse_String(parseState, "c"))
 389       RETURN_ERROR;
 390
 391    if (!Parse_String(parseState, "["))
 392       RETURN_ERROR;
 393
 394    if (!Peek_Token(parseState, token))
 395       RETURN_ERROR;
 396
 397    if (IsDigit(token[0])) {
 398       /* a numbered program parameter register */
 399       GLint reg;
 400       (void) Parse_Token(parseState, token);
 401       reg = _mesa_atoi((char *) token);
 402       if (reg >= MAX_NV_VERTEX_PROGRAM_PARAMS)
 403          RETURN_ERROR1("Bad program parameter number");
 404       srcReg->File = PROGRAM_ENV_PARAM;
 405       srcReg->Index = reg;
 406    }
 407    else if (_mesa_strcmp((const char *) token, "A0") == 0) {
 408       /* address register "A0.x" */
 409       if (!Parse_AddrReg(parseState))
 410          RETURN_ERROR;
 411
 412       srcReg->RelAddr = GL_TRUE;
 413       srcReg->File = PROGRAM_ENV_PARAM;
 414       /* Look for +/-N offset */
 415       if (!Peek_Token(parseState, token))
 416          RETURN_ERROR;
 417
 418       if (token[0] == '-' || token[0] == '+') {
 419          const GLubyte sign = token[0];
 420          (void) Parse_Token(parseState, token); /* consume +/- */
 421
 422          /* an integer should be next */
 423          if (!Parse_Token(parseState, token))
 424             RETURN_ERROR;
 425
 426          if (IsDigit(token[0])) {
 427             const GLint k = _mesa_atoi((char *) token);
 428             if (sign == '-') {
 429                if (k > 64)
 430                   RETURN_ERROR1("Bad address offset");
 431                srcReg->Index = -k;
 432             }
 433             else {
 434                if (k > 63)
 435                   RETURN_ERROR1("Bad address offset");
 436                srcReg->Index = k;
 437             }
 438          }
 439          else {
 440             RETURN_ERROR;
 441          }
 442       }
 443       else {
 444          /* probably got a ']', catch it below */
 445       }
 446    }
 447    else {
 448       RETURN_ERROR;
 449    }
 450
 451    /* Match closing ']' */
 452    if (!Parse_String(parseState, "]"))
 453       RETURN_ERROR;
 454
 455    return GL_TRUE;
 456 }
 457
 458
 459 /**
 460  * Parse v[#] or v[<name>]
 461  */
 462 static GLboolean
 463 Parse_AttribReg(struct parse_state *parseState, GLint *tempRegNum)
 464 {
 465    GLubyte token[100];
 466    GLint j;
 467
 468    /* Match 'v' */
 469    if (!Parse_String(parseState, "v"))
 470       RETURN_ERROR;
 471
 472    /* Match '[' */
 473    if (!Parse_String(parseState, "["))
 474       RETURN_ERROR;
 475
 476    /* match number or named register */
 477    if (!Parse_Token(parseState, token))
 478       RETURN_ERROR;
 479
 480    if (parseState->isStateProgram && token[0] != '0')
 481       RETURN_ERROR1("Only v[0] accessible in vertex state programs");
 482
 483    if (IsDigit(token[0])) {
 484       GLint reg = _mesa_atoi((char *) token);
 485       if (reg >= MAX_NV_VERTEX_PROGRAM_INPUTS)
 486          RETURN_ERROR1("Bad vertex attribute register name");
 487       *tempRegNum = reg;
 488    }
 489    else {
 490       for (j = 0; InputRegisters[j]; j++) {
 491          if (_mesa_strcmp((const char *) token, InputRegisters[j]) == 0) {
 492             *tempRegNum = j;
 493             break;
 494          }
 495       }
 496       if (!InputRegisters[j]) {
 497          /* unknown input register label */
 498          RETURN_ERROR2("Bad register name", token);
 499       }
 500    }
 501
 502    /* Match '[' */
 503    if (!Parse_String(parseState, "]"))
 504       RETURN_ERROR;
 505
 506    return GL_TRUE;
 507 }
 508
 509
 510 static GLboolean
 511 Parse_OutputReg(struct parse_state *parseState, GLint *outputRegNum)
 512 {
 513    GLubyte token[100];
 514    GLint start, j;
 515
 516    /* Match 'o' */
 517    if (!Parse_String(parseState, "o"))
 518       RETURN_ERROR;
 519
 520    /* Match '[' */
 521    if (!Parse_String(parseState, "["))
 522       RETURN_ERROR;
 523
 524    /* Get output reg name */
 525    if (!Parse_Token(parseState, token))
 526       RETURN_ERROR;
 527
 528    if (parseState->isPositionInvariant)
 529       start = 1; /* skip HPOS register name */
 530    else
 531       start = 0;
 532
 533    /* try to match an output register name */
 534    for (j = start; OutputRegisters[j]; j++) {
 535       if (_mesa_strcmp((const char *) token, OutputRegisters[j]) == 0) {
 536          *outputRegNum = j;
 537          break;
 538       }
 539    }
 540    if (!OutputRegisters[j])
 541       RETURN_ERROR1("Unrecognized output register name");
 542
 543    /* Match ']' */
 544    if (!Parse_String(parseState, "]"))
 545       RETURN_ERROR1("Expected ]");
 546
 547    return GL_TRUE;
 548 }
 549
 550
 551 static GLboolean
 552 Parse_MaskedDstReg(struct parse_state *parseState, struct prog_dst_register *dstReg)
 553 {
 554    GLubyte token[100];
 555    GLint idx;
 556
 557    /* Dst reg can be R<n> or o[n] */
 558    if (!Peek_Token(parseState, token))
 559       RETURN_ERROR;
 560
 561    if (token[0] == 'R') {
 562       /* a temporary register */
 563       dstReg->File = PROGRAM_TEMPORARY;
 564       if (!Parse_TempReg(parseState, &idx))
 565          RETURN_ERROR;
 566       dstReg->Index = idx;
 567    }
 568    else if (!parseState->isStateProgram && token[0] == 'o') {
 569       /* an output register */
 570       dstReg->File = PROGRAM_OUTPUT;
 571       if (!Parse_OutputReg(parseState, &idx))
 572          RETURN_ERROR;
 573       dstReg->Index = idx;
 574    }
 575    else if (parseState->isStateProgram && token[0] == 'c' &&
 576             parseState->isStateProgram) {
 577       /* absolute program parameter register */
 578       /* Only valid for vertex state programs */
 579       dstReg->File = PROGRAM_ENV_PARAM;
 580       if (!Parse_AbsParamReg(parseState, &idx))
 581          RETURN_ERROR;
 582       dstReg->Index = idx;
 583    }
 584    else {
 585       RETURN_ERROR1("Bad destination register name");
 586    }
 587
 588    /* Parse optional write mask */
 589    if (!Peek_Token(parseState, token))
 590       RETURN_ERROR;
 591
 592    if (token[0] == '.') {
 593       /* got a mask */
 594       GLint k = 0;
 595
 596       if (!Parse_String(parseState, "."))
 597          RETURN_ERROR;
 598
 599       if (!Parse_Token(parseState, token))
 600          RETURN_ERROR;
 601
 602       dstReg->WriteMask = 0;
 603
 604       if (token[k] == 'x') {
 605          dstReg->WriteMask |= WRITEMASK_X;
 606          k++;
 607       }
 608       if (token[k] == 'y') {
 609          dstReg->WriteMask |= WRITEMASK_Y;
 610          k++;
 611       }
 612       if (token[k] == 'z') {
 613          dstReg->WriteMask |= WRITEMASK_Z;
 614          k++;
 615       }
 616       if (token[k] == 'w') {
 617          dstReg->WriteMask |= WRITEMASK_W;
 618          k++;
 619       }
 620       if (k == 0) {
 621          RETURN_ERROR1("Bad writemask character");
 622       }
 623       return GL_TRUE;
 624    }
 625    else {
 626       dstReg->WriteMask = WRITEMASK_XYZW;
 627       return GL_TRUE;
 628    }
 629 }
 630
 631
 632 static GLboolean
 633 Parse_SwizzleSrcReg(struct parse_state *parseState, struct prog_src_register *srcReg)
 634 {
 635    GLubyte token[100];
 636    GLint idx;
 637
 638    srcReg->RelAddr = GL_FALSE;
 639
 640    /* check for '-' */
 641    if (!Peek_Token(parseState, token))
 642       RETURN_ERROR;
 643    if (token[0] == '-') {
 644       (void) Parse_String(parseState, "-");
 645       srcReg->NegateBase = NEGATE_XYZW;
 646       if (!Peek_Token(parseState, token))
 647          RETURN_ERROR;
 648    }
 649    else {
 650       srcReg->NegateBase = NEGATE_NONE;
 651    }
 652
 653    /* Src reg can be R<n>, c[n], c[n +/- offset], or a named vertex attrib */
 654    if (token[0] == 'R') {
 655       srcReg->File = PROGRAM_TEMPORARY;
 656       if (!Parse_TempReg(parseState, &idx))
 657          RETURN_ERROR;
 658       srcReg->Index = idx;
 659    }
 660    else if (token[0] == 'c') {
 661       if (!Parse_ParamReg(parseState, srcReg))
 662          RETURN_ERROR;
 663    }
 664    else if (token[0] == 'v') {
 665       srcReg->File = PROGRAM_INPUT;
 666       if (!Parse_AttribReg(parseState, &idx))
 667          RETURN_ERROR;
 668       srcReg->Index = idx;
 669    }
 670    else {
 671       RETURN_ERROR2("Bad source register name", token);
 672    }
 673
 674    /* init swizzle fields */
 675    srcReg->Swizzle = SWIZZLE_NOOP;
 676
 677    /* Look for optional swizzle suffix */
 678    if (!Peek_Token(parseState, token))
 679       RETURN_ERROR;
 680    if (token[0] == '.') {
 681       (void) Parse_String(parseState, ".");  /* consume . */
 682
 683       if (!Parse_Token(parseState, token))
 684          RETURN_ERROR;
 685
 686       if (token[1] == 0) {
 687          /* single letter swizzle */
 688          if (token[0] == 'x')
 689             srcReg->Swizzle = MAKE_SWIZZLE4(0, 0, 0, 0);
 690          else if (token[0] == 'y')
 691             srcReg->Swizzle = MAKE_SWIZZLE4(1, 1, 1, 1);
 692          else if (token[0] == 'z')
 693             srcReg->Swizzle = MAKE_SWIZZLE4(2, 2, 2, 2);
 694          else if (token[0] == 'w')
 695             srcReg->Swizzle = MAKE_SWIZZLE4(3, 3, 3, 3);
 696          else
 697             RETURN_ERROR1("Expected x, y, z, or w");
 698       }
 699       else {
 700          /* 2, 3 or 4-component swizzle */
 701          GLint k;
 702
 703          srcReg->Swizzle = 0;
 704
 705          for (k = 0; token[k] && k < 5; k++) {
 706             if (token[k] == 'x')
 707                srcReg->Swizzle |= 0 << (k*3);
 708             else if (token[k] == 'y')
 709                srcReg->Swizzle |= 1 << (k*3);
 710             else if (token[k] == 'z')
 711                srcReg->Swizzle |= 2 << (k*3);
 712             else if (token[k] == 'w')
 713                srcReg->Swizzle |= 3 << (k*3);
 714             else
 715                RETURN_ERROR;
 716          }
 717          if (k >= 5)
 718             RETURN_ERROR;
 719       }
 720    }
 721
 722    return GL_TRUE;
 723 }
 724
 725
 726 static GLboolean
 727 Parse_ScalarSrcReg(struct parse_state *parseState, struct prog_src_register *srcReg)
 728 {
 729    GLubyte token[100];
 730    GLint idx;
 731
 732    srcReg->RelAddr = GL_FALSE;
 733
 734    /* check for '-' */
 735    if (!Peek_Token(parseState, token))
 736       RETURN_ERROR;
 737    if (token[0] == '-') {
 738       srcReg->NegateBase = NEGATE_XYZW;
 739       (void) Parse_String(parseState, "-"); /* consume '-' */
 740       if (!Peek_Token(parseState, token))
 741          RETURN_ERROR;
 742    }
 743    else {
 744       srcReg->NegateBase = NEGATE_NONE;
 745    }
 746
 747    /* Src reg can be R<n>, c[n], c[n +/- offset], or a named vertex attrib */
 748    if (token[0] == 'R') {
 749       srcReg->File = PROGRAM_TEMPORARY;
 750       if (!Parse_TempReg(parseState, &idx))
 751          RETURN_ERROR;
 752       srcReg->Index = idx;
 753    }
 754    else if (token[0] == 'c') {
 755       if (!Parse_ParamReg(parseState, srcReg))
 756          RETURN_ERROR;
 757    }
 758    else if (token[0] == 'v') {
 759       srcReg->File = PROGRAM_INPUT;
 760       if (!Parse_AttribReg(parseState, &idx))
 761          RETURN_ERROR;
 762       srcReg->Index = idx;
 763    }
 764    else {
 765       RETURN_ERROR2("Bad source register name", token);
 766    }
 767
 768    /* Look for .[xyzw] suffix */
 769    if (!Parse_String(parseState, "."))
 770       RETURN_ERROR;
 771
 772    if (!Parse_Token(parseState, token))
 773       RETURN_ERROR;
 774
 775    if (token[0] == 'x' && token[1] == 0) {
 776       srcReg->Swizzle = 0;
 777    }
 778    else if (token[0] == 'y' && token[1] == 0) {
 779       srcReg->Swizzle = 1;
 780    }
 781    else if (token[0] == 'z' && token[1] == 0) {
 782       srcReg->Swizzle = 2;
 783    }
 784    else if (token[0] == 'w' && token[1] == 0) {
 785       srcReg->Swizzle = 3;
 786    }
 787    else {
 788       RETURN_ERROR1("Bad scalar source suffix");
 789    }
 790
 791    return GL_TRUE;
 792 }
 793
 794
 795 static GLint
 796 Parse_UnaryOpInstruction(struct parse_state *parseState,
 797                          struct prog_instruction *inst,
 798                          enum prog_opcode opcode)
 799 {
 800    if (opcode == OPCODE_ABS && !parseState->isVersion1_1)
 801       RETURN_ERROR1("ABS illegal for vertex program 1.0");
 802
 803    inst->Opcode = opcode;
 804    inst->StringPos = parseState->curLine - parseState->start;
 805
 806    /* dest reg */
 807    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 808       RETURN_ERROR;
 809
 810    /* comma */
 811    if (!Parse_String(parseState, ","))
 812       RETURN_ERROR;
 813
 814    /* src arg */
 815    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[0]))
 816       RETURN_ERROR;
 817
 818    /* semicolon */
 819    if (!Parse_String(parseState, ";"))
 820       RETURN_ERROR;
 821
 822    return GL_TRUE;
 823 }
 824
 825
 826 static GLboolean
 827 Parse_BiOpInstruction(struct parse_state *parseState,
 828                       struct prog_instruction *inst,
 829                       enum prog_opcode opcode)
 830 {
 831    if (opcode == OPCODE_DPH && !parseState->isVersion1_1)
 832       RETURN_ERROR1("DPH illegal for vertex program 1.0");
 833    if (opcode == OPCODE_SUB && !parseState->isVersion1_1)
 834       RETURN_ERROR1("SUB illegal for vertex program 1.0");
 835
 836    inst->Opcode = opcode;
 837    inst->StringPos = parseState->curLine - parseState->start;
 838
 839    /* dest reg */
 840    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 841       RETURN_ERROR;
 842
 843    /* comma */
 844    if (!Parse_String(parseState, ","))
 845       RETURN_ERROR;
 846
 847    /* first src arg */
 848    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[0]))
 849       RETURN_ERROR;
 850
 851    /* comma */
 852    if (!Parse_String(parseState, ","))
 853       RETURN_ERROR;
 854
 855    /* second src arg */
 856    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[1]))
 857       RETURN_ERROR;
 858
 859    /* semicolon */
 860    if (!Parse_String(parseState, ";"))
 861       RETURN_ERROR;
 862
 863    /* make sure we don't reference more than one program parameter register */
 864    if (inst->SrcReg[0].File == PROGRAM_ENV_PARAM &&
 865        inst->SrcReg[1].File == PROGRAM_ENV_PARAM &&
 866        inst->SrcReg[0].Index != inst->SrcReg[1].Index)
 867       RETURN_ERROR1("Can't reference two program parameter registers");
 868
 869    /* make sure we don't reference more than one vertex attribute register */
 870    if (inst->SrcReg[0].File == PROGRAM_INPUT &&
 871        inst->SrcReg[1].File == PROGRAM_INPUT &&
 872        inst->SrcReg[0].Index != inst->SrcReg[1].Index)
 873       RETURN_ERROR1("Can't reference two vertex attribute registers");
 874
 875    return GL_TRUE;
 876 }
 877
 878
 879 static GLboolean
 880 Parse_TriOpInstruction(struct parse_state *parseState,
 881                        struct prog_instruction *inst,
 882                        enum prog_opcode opcode)
 883 {
 884    inst->Opcode = opcode;
 885    inst->StringPos = parseState->curLine - parseState->start;
 886
 887    /* dest reg */
 888    if (!Parse_MaskedDstReg(parseState, &inst->DstReg))
 889       RETURN_ERROR;
 890
 891    /* comma */
 892    if (!Parse_String(parseState, ","))
 893       RETURN_ERROR;
 894
 895    /* first src arg */
 896    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[0]))
 897       RETURN_ERROR;
 898
 899    /* comma */
 900    if (!Parse_String(parseState, ","))
 901       RETURN_ERROR;
 902
 903    /* second src arg */
 904    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[1]))
 905       RETURN_ERROR;
 906
 907    /* comma */
 908    if (!Parse_String(parseState, ","))
 909       RETURN_ERROR;
 910
 911    /* third src arg */
 912    if (!Parse_SwizzleSrcReg(parseState, &inst->SrcReg[2]))
 913       RETURN_ERROR;
 914
 915    /* semicolon */
 916    if (!Parse_String(parseState, ";"))
 917       RETURN_ERROR;
 918
 919    /* make sure we don't reference more than one program parameter register */
 920    if ((inst->SrcReg[0].File == PROGRAM_ENV_PARAM &&
 921         inst->SrcReg[1].File == PROGRAM_ENV_PARAM &&
 922         inst->SrcReg[0].Index != inst->SrcReg[1].Index) ||
 923        (inst->SrcReg[0].File == PROGRAM_ENV_PARAM &&
 924         inst->SrcReg[2].File == PROGRAM_ENV_PARAM &&
 925         inst->SrcReg[0].Index != inst->SrcReg[2].Index) ||
 926        (inst->SrcReg[1].File == PROGRAM_ENV_PARAM &&
 927         inst->SrcReg[2].File == PROGRAM_ENV_PARAM &&
 928         inst->SrcReg[1].Index != inst->SrcReg[2].Index))
 929       RETURN_ERROR1("Can only reference one program register");
 930
 931    /* make sure we don't reference more than one vertex attribute register */
 932    if ((inst->SrcReg[0].File == PROGRAM_INPUT &&
 933         inst->SrcReg[1].File == PROGRAM_INPUT &&
 934         inst->SrcReg[0].Index != inst->SrcReg[1].Index) ||
 935        (inst->SrcReg[0].File == PROGRAM_INPUT &&
 936         inst->SrcReg[2].File == PROGRAM_INPUT &&
 937         inst->SrcReg[0].Index != inst->SrcReg[2].Index) ||
 938        (inst->SrcReg[1].File == PROGRAM_INPUT &&
 939         inst->SrcReg[2].File == PROGRAM_INPUT &&
 940         inst->SrcReg[1].Index != inst->SrcReg[2].Index))
 941       RETURN_ERROR1("Can only reference one input register");
 942
 943    return GL_TRUE;
 944 }
 945
 946
 947 static GLboolean
 948 Parse_ScalarInstruction(struct parse_state *parseState,
 949                         struct prog_instruction *inst,
 950                         enum prog_opcode opcode)
 951 {
 952    if (opcode == 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 prog_instruction *inst)
 980 {
 981    inst->Opcode = OPCODE_ARL;
 982    inst->StringPos = parseState->curLine - parseState->start;
 983
 984    /* Make ARB_vp backends happy */
 985    inst->DstReg.File = PROGRAM_ADDRESS;
 986    inst->DstReg.WriteMask = WRITEMASK_X;
 987    inst->DstReg.Index = 0;
 988
 989    /* dest A0 reg */
 990    if (!Parse_AddrReg(parseState))
 991       RETURN_ERROR;
 992
 993    /* comma */
 994    if (!Parse_String(parseState, ","))
 995       RETURN_ERROR;
 996
 997    /* parse src reg */
 998    if (!Parse_ScalarSrcReg(parseState, &inst->SrcReg[0]))
 999       RETURN_ERROR;
1000
1001    /* semicolon */
1002    if (!Parse_String(parseState, ";"))
1003       RETURN_ERROR;
1004
1005    return GL_TRUE;
1006 }
1007
1008
1009 static GLboolean
1010 Parse_EndInstruction(struct parse_state *parseState, struct prog_instruction *inst)
1011 {
1012    GLubyte token[100];
1013
1014    inst->Opcode = OPCODE_END;
1015    inst->StringPos = parseState->curLine - parseState->start;
1016
1017    /* this should fail! */
1018    if (Parse_Token(parseState, token))
1019       RETURN_ERROR2("Unexpected token after END:", token);
1020    else
1021       return GL_TRUE;
1022 }
1023
1024
1025 /**
1026  * The PRINT instruction is Mesa-specific and is meant as a debugging aid for
1027  * the vertex program developer.
1028  * The NV_vertex_program extension grammar is modified as follows:
1029  *
1030  *  <instruction>        ::= <ARL-instruction>
1031  *                         | ...
1032  *                         | <PRINT-instruction>
1033  *
1034  *  <PRINT-instruction>  ::= "PRINT" <string literal>
1035  *                         | "PRINT" <string literal> "," <srcReg>
1036  *                         | "PRINT" <string literal> "," <dstReg>
1037  */
1038 static GLboolean
1039 Parse_PrintInstruction(struct parse_state *parseState, struct prog_instruction *inst)
1040 {
1041    const GLubyte *str;
1042    GLubyte *msg;
1043    GLuint len;
1044    GLubyte token[100];
1045    struct prog_src_register *srcReg = &inst->SrcReg[0];
1046    GLint idx;
1047
1048    inst->Opcode = OPCODE_PRINT;
1049    inst->StringPos = parseState->curLine - parseState->start;
1050
1051    /* The first argument is a literal string 'just like this' */
1052    if (!Parse_String(parseState, "'"))
1053       RETURN_ERROR;
1054
1055    str = parseState->pos;
1056    for (len = 0; str[len] != '\''; len++) /* find closing quote */
1057       ;
1058    parseState->pos += len + 1;
1059    msg = (GLubyte*) _mesa_malloc(len + 1);
1060
1061    _mesa_memcpy(msg, str, len);
1062    msg[len] = 0;
1063    inst->Data = msg;
1064
1065    /* comma */
1066    if (Parse_String(parseState, ",")) {
1067
1068       /* The second argument is a register name */
1069       if (!Peek_Token(parseState, token))
1070          RETURN_ERROR;
1071
1072       srcReg->RelAddr = GL_FALSE;
1073       srcReg->NegateBase = NEGATE_NONE;
1074       srcReg->Swizzle = SWIZZLE_NOOP;
1075
1076       /* Register can be R<n>, c[n], c[n +/- offset], a named vertex attrib,
1077        * or an o[n] output register.
1078        */
1079       if (token[0] == 'R') {
1080          srcReg->File = PROGRAM_TEMPORARY;
1081          if (!Parse_TempReg(parseState, &idx))
1082             RETURN_ERROR;
1083          srcReg->Index = idx;
1084       }
1085       else if (token[0] == 'c') {
1086          srcReg->File = PROGRAM_ENV_PARAM;
1087          if (!Parse_ParamReg(parseState, srcReg))
1088             RETURN_ERROR;
1089       }
1090       else if (token[0] == 'v') {
1091          srcReg->File = PROGRAM_INPUT;
1092          if (!Parse_AttribReg(parseState, &idx))
1093             RETURN_ERROR;
1094          srcReg->Index = idx;
1095       }
1096       else if (token[0] == 'o') {
1097          srcReg->File = PROGRAM_OUTPUT;
1098          if (!Parse_OutputReg(parseState, &idx))
1099             RETURN_ERROR;
1100          srcReg->Index = idx;
1101       }
1102       else {
1103          RETURN_ERROR2("Bad source register name", token);
1104       }
1105    }
1106    else {
1107       srcReg->File = 0;
1108    }
1109
1110    /* semicolon */
1111    if (!Parse_String(parseState, ";"))
1112       RETURN_ERROR;
1113
1114    return GL_TRUE;
1115 }
1116
1117
1118 static GLboolean
1119 Parse_OptionSequence(struct parse_state *parseState,
1120                      struct prog_instruction program[])
1121 {
1122    (void) program;
1123    while (1) {
1124       if (!Parse_String(parseState, "OPTION"))
1125          return GL_TRUE;  /* ok, not an OPTION statement */
1126       if (Parse_String(parseState, "NV_position_invariant")) {
1127          parseState->isPositionInvariant = GL_TRUE;
1128       }
1129       else {
1130          RETURN_ERROR1("unexpected OPTION statement");
1131       }
1132       if (!Parse_String(parseState, ";"))
1133          return GL_FALSE;
1134    }
1135 }
1136
1137
1138 static GLboolean
1139 Parse_InstructionSequence(struct parse_state *parseState,
1140                           struct prog_instruction program[])
1141 {
1142    while (1) {
1143       struct prog_instruction *inst = program + parseState->numInst;
1144
1145       /* Initialize the instruction */
1146       _mesa_init_instructions(inst, 1);
1147
1148       if (Parse_String(parseState, "MOV")) {
1149          if (!Parse_UnaryOpInstruction(parseState, inst, OPCODE_MOV))
1150             RETURN_ERROR;
1151       }
1152       else if (Parse_String(parseState, "LIT")) {
1153          if (!Parse_UnaryOpInstruction(parseState, inst, OPCODE_LIT))
1154             RETURN_ERROR;
1155       }
1156       else if (Parse_String(parseState, "ABS")) {
1157          if (!Parse_UnaryOpInstruction(parseState, inst, OPCODE_ABS))
1158             RETURN_ERROR;
1159       }
1160       else if (Parse_String(parseState, "MUL")) {
1161          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_MUL))
1162             RETURN_ERROR;
1163       }
1164       else if (Parse_String(parseState, "ADD")) {
1165          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_ADD))
1166             RETURN_ERROR;
1167       }
1168       else if (Parse_String(parseState, "DP3")) {
1169          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_DP3))
1170             RETURN_ERROR;
1171       }
1172       else if (Parse_String(parseState, "DP4")) {
1173          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_DP4))
1174             RETURN_ERROR;
1175       }
1176       else if (Parse_String(parseState, "DST")) {
1177          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_DST))
1178             RETURN_ERROR;
1179       }
1180       else if (Parse_String(parseState, "MIN")) {
1181          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_MIN))
1182             RETURN_ERROR;
1183       }
1184       else if (Parse_String(parseState, "MAX")) {
1185          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_MAX))
1186             RETURN_ERROR;
1187       }
1188       else if (Parse_String(parseState, "SLT")) {
1189          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_SLT))
1190             RETURN_ERROR;
1191       }
1192       else if (Parse_String(parseState, "SGE")) {
1193          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_SGE))
1194             RETURN_ERROR;
1195       }
1196       else if (Parse_String(parseState, "DPH")) {
1197          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_DPH))
1198             RETURN_ERROR;
1199       }
1200       else if (Parse_String(parseState, "SUB")) {
1201          if (!Parse_BiOpInstruction(parseState, inst, OPCODE_SUB))
1202             RETURN_ERROR;
1203       }
1204       else if (Parse_String(parseState, "MAD")) {
1205          if (!Parse_TriOpInstruction(parseState, inst, OPCODE_MAD))
1206             RETURN_ERROR;
1207       }
1208       else if (Parse_String(parseState, "RCP")) {
1209          if (!Parse_ScalarInstruction(parseState, inst, OPCODE_RCP))
1210             RETURN_ERROR;
1211       }
1212       else if (Parse_String(parseState, "RSQ")) {
1213          if (!Parse_ScalarInstruction(parseState, inst, OPCODE_RSQ))
1214             RETURN_ERROR;
1215       }
1216       else if (Parse_String(parseState, "EXP")) {
1217          if (!Parse_ScalarInstruction(parseState, inst, OPCODE_EXP))
1218             RETURN_ERROR;
1219       }
1220       else if (Parse_String(parseState, "LOG")) {
1221          if (!Parse_ScalarInstruction(parseState, inst, OPCODE_LOG))
1222             RETURN_ERROR;
1223       }
1224       else if (Parse_String(parseState, "RCC")) {
1225          if (!Parse_ScalarInstruction(parseState, inst, OPCODE_RCC))
1226             RETURN_ERROR;
1227       }
1228       else if (Parse_String(parseState, "ARL")) {
1229          if (!Parse_AddressInstruction(parseState, inst))
1230             RETURN_ERROR;
1231       }
1232       else if (Parse_String(parseState, "PRINT")) {
1233          if (!Parse_PrintInstruction(parseState, inst))
1234             RETURN_ERROR;
1235       }
1236       else if (Parse_String(parseState, "END")) {
1237          if (!Parse_EndInstruction(parseState, inst))
1238             RETURN_ERROR;
1239          else {
1240             parseState->numInst++;
1241             return GL_TRUE;  /* all done */
1242          }
1243       }
1244       else {
1245          /* bad instruction name */
1246          RETURN_ERROR1("Unexpected token");
1247       }
1248
1249       /* examine input/output registers */
1250       if (inst->DstReg.File == PROGRAM_OUTPUT)
1251          parseState->outputsWritten |= (1 << inst->DstReg.Index);
1252       else if (inst->DstReg.File == PROGRAM_ENV_PARAM)
1253          parseState->anyProgRegsWritten = GL_TRUE;
1254
1255       if (inst->SrcReg[0].File == PROGRAM_INPUT)
1256          parseState->inputsRead |= (1 << inst->SrcReg[0].Index);
1257       if (inst->SrcReg[1].File == PROGRAM_INPUT)
1258          parseState->inputsRead |= (1 << inst->SrcReg[1].Index);
1259       if (inst->SrcReg[2].File == PROGRAM_INPUT)
1260          parseState->inputsRead |= (1 << inst->SrcReg[2].Index);
1261
1262       parseState->numInst++;
1263
1264       if (parseState->numInst >= MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS)
1265          RETURN_ERROR1("Program too long");
1266    }
1267
1268    RETURN_ERROR;
1269 }
1270
1271
1272 static GLboolean
1273 Parse_Program(struct parse_state *parseState,
1274               struct prog_instruction instBuffer[])
1275 {
1276    if (parseState->isVersion1_1) {
1277       if (!Parse_OptionSequence(parseState, instBuffer)) {
1278          return GL_FALSE;
1279       }
1280    }
1281    return Parse_InstructionSequence(parseState, instBuffer);
1282 }
1283
1284
1285 /**
1286  * Parse/compile the 'str' returning the compiled 'program'.
1287  * ctx->Program.ErrorPos will be -1 if successful.  Otherwise, ErrorPos
1288  * indicates the position of the error in 'str'.
1289  */
1290 void
1291 _mesa_parse_nv_vertex_program(GLcontext *ctx, GLenum dstTarget,
1292                               const GLubyte *str, GLsizei len,
1293                               struct gl_vertex_program *program)
1294 {
1295    struct parse_state parseState;
1296    struct prog_instruction instBuffer[MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS];
1297    struct prog_instruction *newInst;
1298    GLenum target;
1299    GLubyte *programString;
1300
1301    /* Make a null-terminated copy of the program string */
1302    programString = (GLubyte *) MALLOC(len + 1);
1303    if (!programString) {
1304       _mesa_error(ctx, GL_OUT_OF_MEMORY, "glLoadProgramNV");
1305       return;
1306    }
1307    MEMCPY(programString, str, len);
1308    programString[len] = 0;
1309
1310    /* Get ready to parse */
1311    parseState.ctx = ctx;
1312    parseState.start = programString;
1313    parseState.isPositionInvariant = GL_FALSE;
1314    parseState.isVersion1_1 = GL_FALSE;
1315    parseState.numInst = 0;
1316    parseState.inputsRead = 0;
1317    parseState.outputsWritten = 0;
1318    parseState.anyProgRegsWritten = GL_FALSE;
1319
1320    /* Reset error state */
1321    _mesa_set_program_error(ctx, -1, NULL);
1322
1323    /* check the program header */
1324    if (_mesa_strncmp((const char *) programString, "!!VP1.0", 7) == 0) {
1325       target = GL_VERTEX_PROGRAM_NV;
1326       parseState.pos = programString + 7;
1327       parseState.isStateProgram = GL_FALSE;
1328    }
1329    else if (_mesa_strncmp((const char *) programString, "!!VP1.1", 7) == 0) {
1330       target = GL_VERTEX_PROGRAM_NV;
1331       parseState.pos = programString + 7;
1332       parseState.isStateProgram = GL_FALSE;
1333       parseState.isVersion1_1 = GL_TRUE;
1334    }
1335    else if (_mesa_strncmp((const char *) programString, "!!VSP1.0", 8) == 0) {
1336       target = GL_VERTEX_STATE_PROGRAM_NV;
1337       parseState.pos = programString + 8;
1338       parseState.isStateProgram = GL_TRUE;
1339    }
1340    else {
1341       /* invalid header */
1342       ctx->Program.ErrorPos = 0;
1343       _mesa_error(ctx, GL_INVALID_OPERATION, "glLoadProgramNV(bad header)");
1344       return;
1345    }
1346
1347    /* make sure target and header match */
1348    if (target != dstTarget) {
1349       _mesa_error(ctx, GL_INVALID_OPERATION,
1350                   "glLoadProgramNV(target mismatch)");
1351       return;
1352    }
1353
1354
1355    if (Parse_Program(&parseState, instBuffer)) {
1356       /* successful parse! */
1357
1358       if (parseState.isStateProgram) {
1359          if (!parseState.anyProgRegsWritten) {
1360             _mesa_error(ctx, GL_INVALID_OPERATION,
1361                         "glLoadProgramNV(c[#] not written)");
1362             return;
1363          }
1364       }
1365       else {
1366          if (!parseState.isPositionInvariant &&
1367              !(parseState.outputsWritten & (1 << VERT_RESULT_HPOS))) {
1368             /* bit 1 = HPOS register */
1369             _mesa_error(ctx, GL_INVALID_OPERATION,
1370                         "glLoadProgramNV(HPOS not written)");
1371             return;
1372          }
1373       }
1374
1375       /* copy the compiled instructions */
1376       assert(parseState.numInst <= MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS);
1377       newInst = _mesa_alloc_instructions(parseState.numInst);
1378       if (!newInst) {
1379          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glLoadProgramNV");
1380          _mesa_free(programString);
1381          return;  /* out of memory */
1382       }
1383       _mesa_memcpy(newInst, instBuffer,
1384                    parseState.numInst * sizeof(struct prog_instruction));
1385
1386       /* install the program */
1387       program->Base.Target = target;
1388       if (program->Base.String) {
1389          _mesa_free(program->Base.String);
1390       }
1391       program->Base.String = programString;
1392       program->Base.Format = GL_PROGRAM_FORMAT_ASCII_ARB;
1393       if (program->Base.Instructions) {
1394          _mesa_free(program->Base.Instructions);
1395       }
1396       program->Base.Instructions = newInst;
1397       program->Base.InputsRead = parseState.inputsRead;
1398       if (parseState.isPositionInvariant)
1399          program->Base.InputsRead |= VERT_BIT_POS;
1400       program->Base.NumInstructions = parseState.numInst;
1401       program->Base.OutputsWritten = parseState.outputsWritten;
1402       program->IsPositionInvariant = parseState.isPositionInvariant;
1403       program->IsNVProgram = GL_TRUE;
1404
1405 #ifdef DEBUG_foo
1406       _mesa_printf("--- glLoadProgramNV result ---\n");
1407       _mesa_print_nv_vertex_program(program);
1408       _mesa_printf("------------------------------\n");
1409 #endif
1410    }
1411    else {
1412       /* Error! */
1413       _mesa_error(ctx, GL_INVALID_OPERATION, "glLoadProgramNV");
1414       /* NOTE: _mesa_set_program_error would have been called already */
1415       /* GL_NV_vertex_program isn't supposed to set the error string
1416        * so we reset it here.
1417        */
1418       _mesa_set_program_error(ctx, ctx->Program.ErrorPos, NULL);
1419    }
1420 }
1421
1422
1423 static void
1424 PrintSrcReg(const struct prog_src_register *src)
1425 {
1426    static const char comps[5] = "xyzw";
1427    if (src->NegateBase)
1428       _mesa_printf("-");
1429    if (src->RelAddr) {
1430       if (src->Index > 0)
1431          _mesa_printf("c[A0.x + %d]", src->Index);
1432       else if (src->Index < 0)
1433          _mesa_printf("c[A0.x - %d]", -src->Index);
1434       else
1435          _mesa_printf("c[A0.x]");
1436    }
1437    else if (src->File == PROGRAM_OUTPUT) {
1438       _mesa_printf("o[%s]", OutputRegisters[src->Index]);
1439    }
1440    else if (src->File == PROGRAM_INPUT) {
1441       _mesa_printf("v[%s]", InputRegisters[src->Index]);
1442    }
1443    else if (src->File == PROGRAM_ENV_PARAM) {
1444       _mesa_printf("c[%d]", src->Index);
1445    }
1446    else {
1447       ASSERT(src->File == PROGRAM_TEMPORARY);
1448       _mesa_printf("R%d", src->Index);
1449    }
1450
1451    if (GET_SWZ(src->Swizzle, 0) == GET_SWZ(src->Swizzle, 1) &&
1452        GET_SWZ(src->Swizzle, 0) == GET_SWZ(src->Swizzle, 2) &&
1453        GET_SWZ(src->Swizzle, 0) == GET_SWZ(src->Swizzle, 3)) {
1454       _mesa_printf(".%c", comps[GET_SWZ(src->Swizzle, 0)]);
1455    }
1456    else if (src->Swizzle != SWIZZLE_NOOP) {
1457       _mesa_printf(".%c%c%c%c",
1458              comps[GET_SWZ(src->Swizzle, 0)],
1459              comps[GET_SWZ(src->Swizzle, 1)],
1460              comps[GET_SWZ(src->Swizzle, 2)],
1461              comps[GET_SWZ(src->Swizzle, 3)]);
1462    }
1463 }
1464
1465
1466 static void
1467 PrintDstReg(const struct prog_dst_register *dst)
1468 {
1469    if (dst->File == PROGRAM_OUTPUT) {
1470       _mesa_printf("o[%s]", OutputRegisters[dst->Index]);
1471    }
1472    else if (dst->File == PROGRAM_INPUT) {
1473       _mesa_printf("v[%s]", InputRegisters[dst->Index]);
1474    }
1475    else if (dst->File == PROGRAM_ENV_PARAM) {
1476       _mesa_printf("c[%d]", dst->Index);
1477    }
1478    else {
1479       ASSERT(dst->File == PROGRAM_TEMPORARY);
1480       _mesa_printf("R%d", dst->Index);
1481    }
1482
1483    if (dst->WriteMask != 0 && dst->WriteMask != WRITEMASK_XYZW) {
1484       _mesa_printf(".");
1485       if (dst->WriteMask & WRITEMASK_X)
1486          _mesa_printf("x");
1487       if (dst->WriteMask & WRITEMASK_Y)
1488          _mesa_printf("y");
1489       if (dst->WriteMask & WRITEMASK_Z)
1490          _mesa_printf("z");
1491       if (dst->WriteMask & WRITEMASK_W)
1492          _mesa_printf("w");
1493    }
1494 }
1495
1496
1497 /**
1498  * Print a single NVIDIA vertex program instruction.
1499  */
1500 void
1501 _mesa_print_nv_vertex_instruction(const struct prog_instruction *inst)
1502 {
1503    GLuint i, n;
1504
1505    switch (inst->Opcode) {
1506       case OPCODE_MOV:
1507       case OPCODE_LIT:
1508       case OPCODE_RCP:
1509       case OPCODE_RSQ:
1510       case OPCODE_EXP:
1511       case OPCODE_LOG:
1512       case OPCODE_RCC:
1513       case OPCODE_ABS:
1514       case OPCODE_MUL:
1515       case OPCODE_ADD:
1516       case OPCODE_DP3:
1517       case OPCODE_DP4:
1518       case OPCODE_DST:
1519       case OPCODE_MIN:
1520       case OPCODE_MAX:
1521       case OPCODE_SLT:
1522       case OPCODE_SGE:
1523       case OPCODE_DPH:
1524       case OPCODE_SUB:
1525       case OPCODE_MAD:
1526          _mesa_printf("%s ", _mesa_opcode_string(inst->Opcode));
1527          PrintDstReg(&inst->DstReg);
1528          _mesa_printf(", ");
1529          n = _mesa_num_inst_src_regs(inst->Opcode);
1530          for (i = 0; i < n; i++) {
1531             PrintSrcReg(&inst->SrcReg[i]);
1532             if (i + 1 < n)
1533                _mesa_printf(", ");
1534          }
1535          _mesa_printf(";\n");
1536          break;
1537       case OPCODE_ARL:
1538          _mesa_printf("ARL A0.x, ");
1539          PrintSrcReg(&inst->SrcReg[0]);
1540          _mesa_printf(";\n");
1541          break;
1542       case OPCODE_PRINT:
1543          _mesa_printf("PRINT '%s'", inst->Data);
1544          if (inst->SrcReg[0].File != PROGRAM_UNDEFINED) {
1545             _mesa_printf(", ");
1546             PrintSrcReg(&inst->SrcReg[0]);
1547             _mesa_printf(";\n");
1548          }
1549          else {
1550             _mesa_printf("\n");
1551          }
1552          break;
1553       case OPCODE_END:
1554          _mesa_printf("END\n");
1555          break;
1556       default:
1557          _mesa_printf("BAD INSTRUCTION\n");
1558    }
1559 }
1560
1561
1562 /**
1563  * Print (unparse) the given vertex program.  Just for debugging.
1564  */
1565 void
1566 _mesa_print_nv_vertex_program(const struct gl_vertex_program *program)
1567 {
1568    const struct prog_instruction *inst;
1569
1570    for (inst = program->Base.Instructions; ; inst++) {
1571       _mesa_print_nv_vertex_instruction(inst);
1572       if (inst->Opcode == OPCODE_END)
1573          return;
1574    }
1575 }
1576
1577
1578 const char *
1579 _mesa_nv_vertex_input_register_name(GLuint i)
1580 {
1581    ASSERT(i < MAX_NV_VERTEX_PROGRAM_INPUTS);
1582    return InputRegisters[i];
1583 }
1584
1585
1586 const char *
1587 _mesa_nv_vertex_output_register_name(GLuint i)
1588 {
1589    ASSERT(i < MAX_NV_VERTEX_PROGRAM_OUTPUTS);
1590    return OutputRegisters[i];
1591 }
1592