src/mesa/shader/prog_parameter.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.3
   4  *
   5  * Copyright (C) 1999-2007  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 prog_parameter.c
  27  * Program parameter lists and functions.
  28  * \author Brian Paul
  29  */
  30
  31
  32 #include "glheader.h"
  33 #include "imports.h"
  34 #include "macros.h"
  35 #include "prog_instruction.h"
  36 #include "prog_parameter.h"
  37 #include "prog_statevars.h"
  38
  39
  40 struct gl_program_parameter_list *
  41 _mesa_new_parameter_list(void)
  42 {
  43    return CALLOC_STRUCT(gl_program_parameter_list);
  44 }
  45
  46
  47 /**
  48  * Free a parameter list and all its parameters
  49  */
  50 void
  51 _mesa_free_parameter_list(struct gl_program_parameter_list *paramList)
  52 {
  53    GLuint i;
  54    for (i = 0; i < paramList->NumParameters; i++) {
  55       if (paramList->Parameters[i].Name)
  56          _mesa_free((void *) paramList->Parameters[i].Name);
  57    }
  58    _mesa_free(paramList->Parameters);
  59    if (paramList->ParameterValues)
  60       _mesa_align_free(paramList->ParameterValues);
  61    _mesa_free(paramList);
  62 }
  63
  64
  65 /**
  66  * Add a new parameter to a parameter list.
  67  * Note that parameter values are usually 4-element GLfloat vectors.
  68  * When size > 4 we'll allocate a sequential block of parameters to
  69  * store all the values (in blocks of 4).
  70  *
  71  * \param paramList  the list to add the parameter to
  72  * \param type  type of parameter, such as
  73  * \param name  the parameter name, will be duplicated/copied!
  74  * \param size  number of elements in 'values' vector (1..4, or more)
  75  * \param values  initial parameter value, up to 4 GLfloats, or NULL
  76  * \param state  state indexes, or NULL
  77  * \return  index of new parameter in the list, or -1 if error (out of mem)
  78  */
  79 GLint
  80 _mesa_add_parameter(struct gl_program_parameter_list *paramList,
  81                     enum register_file type, const char *name,
  82                     GLuint size, GLenum datatype, const GLfloat *values,
  83                     const gl_state_index state[STATE_LENGTH])
  84 {
  85    const GLuint oldNum = paramList->NumParameters;
  86    const GLuint sz4 = (size + 3) / 4; /* no. of new param slots needed */
  87
  88    assert(size > 0);
  89
  90    if (oldNum + sz4 > paramList->Size) {
  91       /* Need to grow the parameter list array (alloc some extra) */
  92       paramList->Size = paramList->Size + 4 * sz4;
  93
  94       /* realloc arrays */
  95       paramList->Parameters = (struct gl_program_parameter *)
  96          _mesa_realloc(paramList->Parameters,
  97                        oldNum * sizeof(struct gl_program_parameter),
  98                        paramList->Size * sizeof(struct gl_program_parameter));
  99
 100       paramList->ParameterValues = (GLfloat (*)[4])
 101          _mesa_align_realloc(paramList->ParameterValues,         /* old buf */
 102                              oldNum * 4 * sizeof(GLfloat),      /* old size */
 103                              paramList->Size * 4 *sizeof(GLfloat), /* new sz */
 104                              16);
 105    }
 106
 107    if (!paramList->Parameters ||
 108        !paramList->ParameterValues) {
 109       /* out of memory */
 110       paramList->NumParameters = 0;
 111       paramList->Size = 0;
 112       return -1;
 113    }
 114    else {
 115       GLuint i;
 116
 117       paramList->NumParameters = oldNum + sz4;
 118
 119       _mesa_memset(&paramList->Parameters[oldNum], 0,
 120                    sz4 * sizeof(struct gl_program_parameter));
 121
 122       for (i = 0; i < sz4; i++) {
 123          struct gl_program_parameter *p = paramList->Parameters + oldNum + i;
 124          p->Name = name ? _mesa_strdup(name) : NULL;
 125          p->Type = type;
 126          p->Size = size;
 127          p->DataType = datatype;
 128          if (values) {
 129             COPY_4V(paramList->ParameterValues[oldNum + i], values);
 130             values += 4;
 131          }
 132          else {
 133             /* silence valgrind */
 134             ASSIGN_4V(paramList->ParameterValues[oldNum + i], 0, 0, 0, 0);
 135          }
 136          size -= 4;
 137       }
 138
 139       if (state) {
 140          for (i = 0; i < STATE_LENGTH; i++)
 141             paramList->Parameters[oldNum].StateIndexes[i] = state[i];
 142       }
 143
 144       return (GLint) oldNum;
 145    }
 146 }
 147
 148
 149 /**
 150  * Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
 151  * \return index of the new entry in the parameter list
 152  */
 153 GLint
 154 _mesa_add_named_parameter(struct gl_program_parameter_list *paramList,
 155                           const char *name, const GLfloat values[4])
 156 {
 157    return _mesa_add_parameter(paramList, PROGRAM_NAMED_PARAM, name,
 158                               4, GL_NONE, values, NULL);
 159
 160 }
 161
 162
 163 /**
 164  * Add a new named constant to the parameter list.
 165  * This will be used when the program contains something like this:
 166  *    PARAM myVals = { 0, 1, 2, 3 };
 167  *
 168  * \param paramList  the parameter list
 169  * \param name  the name for the constant
 170  * \param values  four float values
 171  * \return index/position of the new parameter in the parameter list
 172  */
 173 GLint
 174 _mesa_add_named_constant(struct gl_program_parameter_list *paramList,
 175                          const char *name, const GLfloat values[4],
 176                          GLuint size)
 177 {
 178 #if 0 /* disable this for now -- we need to save the name! */
 179    GLint pos;
 180    GLuint swizzle;
 181    ASSERT(size == 4); /* XXX future feature */
 182    /* check if we already have this constant */
 183    if (_mesa_lookup_parameter_constant(paramList, values, 4, &pos, &swizzle)) {
 184       return pos;
 185    }
 186 #endif
 187    size = 4; /** XXX fix */
 188    return _mesa_add_parameter(paramList, PROGRAM_CONSTANT, name,
 189                               size, GL_NONE, values, NULL);
 190 }
 191
 192
 193 /**
 194  * Add a new unnamed constant to the parameter list.  This will be used
 195  * when a fragment/vertex program contains something like this:
 196  *    MOV r, { 0, 1, 2, 3 };
 197  * We'll search the parameter list for an existing instance of the
 198  * constant.  If swizzleOut is non-null, we'll try swizzling when
 199  * looking for a match.
 200  *
 201  * \param paramList  the parameter list
 202  * \param values  four float values
 203  * \param swizzleOut  returns swizzle mask for accessing the constant
 204  * \return index/position of the new parameter in the parameter list.
 205  */
 206 GLint
 207 _mesa_add_unnamed_constant(struct gl_program_parameter_list *paramList,
 208                            const GLfloat values[4], GLuint size,
 209                            GLuint *swizzleOut)
 210 {
 211    GLint pos;
 212    ASSERT(size >= 1);
 213    ASSERT(size <= 4);
 214
 215    if (_mesa_lookup_parameter_constant(paramList, values,
 216                                        size, &pos, swizzleOut)) {
 217       return pos;
 218    }
 219
 220    /* Look for empty space in an already unnamed constant parameter
 221     * to add this constant.  This will only work for single-element
 222     * constants because we rely on smearing (i.e. .yyyy or .zzzz).
 223     */
 224    if (size == 1 && swizzleOut) {
 225       for (pos = 0; pos < (GLint) paramList->NumParameters; pos++) {
 226          struct gl_program_parameter *p = paramList->Parameters + pos;
 227          if (p->Type == PROGRAM_CONSTANT && p->Size + size <= 4) {
 228             /* ok, found room */
 229             GLfloat *pVal = paramList->ParameterValues[pos];
 230             GLuint swz = p->Size; /* 1, 2 or 3 for Y, Z, W */
 231             pVal[p->Size] = values[0];
 232             p->Size++;
 233             *swizzleOut = MAKE_SWIZZLE4(swz, swz, swz, swz);
 234             return pos;
 235          }
 236       }
 237    }
 238
 239    /* add a new parameter to store this constant */
 240    pos = _mesa_add_parameter(paramList, PROGRAM_CONSTANT, NULL,
 241                              size, GL_NONE, values, NULL);
 242    if (pos >= 0 && swizzleOut) {
 243       if (size == 1)
 244          *swizzleOut = SWIZZLE_XXXX;
 245       else
 246          *swizzleOut = SWIZZLE_NOOP;
 247    }
 248    return pos;
 249 }
 250
 251
 252 /**
 253  * Add a uniform to the parameter list.
 254  * Note that if the uniform is an array, size may be greater than
 255  * what's implied by the datatype.
 256  * \param name  uniform's name
 257  * \param size  number of floats to allocate
 258  * \param datatype  GL_FLOAT_VEC3, GL_FLOAT_MAT4, etc.
 259  */
 260 GLint
 261 _mesa_add_uniform(struct gl_program_parameter_list *paramList,
 262                   const char *name, GLuint size, GLenum datatype)
 263 {
 264    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 265    ASSERT(datatype != GL_NONE);
 266    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_UNIFORM) {
 267       ASSERT(paramList->Parameters[i].Size == size);
 268       ASSERT(paramList->Parameters[i].DataType == datatype);
 269       /* already in list */
 270       return i;
 271    }
 272    else {
 273       i = _mesa_add_parameter(paramList, PROGRAM_UNIFORM, name,
 274                               size, datatype, NULL, NULL);
 275       return i;
 276    }
 277 }
 278
 279
 280 /**
 281  * Add a sampler to the parameter list.
 282  * \param name  uniform's name
 283  * \param datatype  GL_SAMPLER_2D, GL_SAMPLER_2D_RECT_ARB, etc.
 284  * \param index  the sampler number (as seen in TEX instructions)
 285  * \return  sampler index (starting at zero) or -1 if error
 286  */
 287 GLint
 288 _mesa_add_sampler(struct gl_program_parameter_list *paramList,
 289                   const char *name, GLenum datatype)
 290 {
 291    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 292    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_SAMPLER) {
 293       ASSERT(paramList->Parameters[i].Size == 1);
 294       ASSERT(paramList->Parameters[i].DataType == datatype);
 295       /* already in list */
 296       return (GLint) paramList->ParameterValues[i][0];
 297    }
 298    else {
 299       const GLint size = 1; /* a sampler is basically a texture unit number */
 300       GLfloat value;
 301       GLint numSamplers = 0;
 302       for (i = 0; i < paramList->NumParameters; i++) {
 303          if (paramList->Parameters[i].Type == PROGRAM_SAMPLER)
 304             numSamplers++;
 305       }
 306       value = (GLfloat) numSamplers;
 307       (void) _mesa_add_parameter(paramList, PROGRAM_SAMPLER, name,
 308                                  size, datatype, &value, NULL);
 309       return numSamplers;
 310    }
 311 }
 312
 313
 314 /**
 315  * Add parameter representing a varying variable.
 316  */
 317 GLint
 318 _mesa_add_varying(struct gl_program_parameter_list *paramList,
 319                   const char *name, GLuint size)
 320 {
 321    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 322    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_VARYING) {
 323       /* already in list */
 324       return i;
 325    }
 326    else {
 327       /*assert(size == 4);*/
 328       i = _mesa_add_parameter(paramList, PROGRAM_VARYING, name,
 329                               size, GL_NONE, NULL, NULL);
 330       return i;
 331    }
 332 }
 333
 334
 335 /**
 336  * Add parameter representing a vertex program attribute.
 337  * \param size  size of attribute (in floats), may be -1 if unknown
 338  * \param attrib  the attribute index, or -1 if unknown
 339  */
 340 GLint
 341 _mesa_add_attribute(struct gl_program_parameter_list *paramList,
 342                     const char *name, GLint size, GLenum datatype, GLint attrib)
 343 {
 344    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 345    if (i >= 0) {
 346       /* replace */
 347       if (attrib < 0)
 348          attrib = i;
 349       paramList->Parameters[i].StateIndexes[0] = attrib;
 350    }
 351    else {
 352       /* add */
 353       gl_state_index state[STATE_LENGTH];
 354       state[0] = (gl_state_index) attrib;
 355       if (size < 0)
 356          size = 4;
 357       i = _mesa_add_parameter(paramList, PROGRAM_INPUT, name,
 358                               size, datatype, NULL, state);
 359    }
 360    return i;
 361 }
 362
 363
 364
 365 #if 0 /* not used yet */
 366 /**
 367  * Returns the number of 4-component registers needed to store a piece
 368  * of GL state.  For matrices this may be as many as 4 registers,
 369  * everything else needs
 370  * just 1 register.
 371  */
 372 static GLuint
 373 sizeof_state_reference(const GLint *stateTokens)
 374 {
 375    if (stateTokens[0] == STATE_MATRIX) {
 376       GLuint rows = stateTokens[4] - stateTokens[3] + 1;
 377       assert(rows >= 1);
 378       assert(rows <= 4);
 379       return rows;
 380    }
 381    else {
 382       return 1;
 383    }
 384 }
 385 #endif
 386
 387
 388 /**
 389  * Add a new state reference to the parameter list.
 390  * This will be used when the program contains something like this:
 391  *    PARAM ambient = state.material.front.ambient;
 392  *
 393  * \param paramList  the parameter list
 394  * \param stateTokens  an array of 5 (STATE_LENGTH) state tokens
 395  * \return index of the new parameter.
 396  */
 397 GLint
 398 _mesa_add_state_reference(struct gl_program_parameter_list *paramList,
 399                           const gl_state_index stateTokens[STATE_LENGTH])
 400 {
 401    const GLuint size = 4; /* XXX fix */
 402    const char *name;
 403    GLint index;
 404
 405    /* Check if the state reference is already in the list */
 406    for (index = 0; index < (GLint) paramList->NumParameters; index++) {
 407       GLuint i, match = 0;
 408       for (i = 0; i < STATE_LENGTH; i++) {
 409          if (paramList->Parameters[index].StateIndexes[i] == stateTokens[i]) {
 410             match++;
 411          }
 412          else {
 413             break;
 414          }
 415       }
 416       if (match == STATE_LENGTH) {
 417          /* this state reference is already in the parameter list */
 418          return index;
 419       }
 420    }
 421
 422    name = _mesa_program_state_string(stateTokens);
 423    index = _mesa_add_parameter(paramList, PROGRAM_STATE_VAR, name,
 424                                size, GL_NONE,
 425                                NULL, (gl_state_index *) stateTokens);
 426    paramList->StateFlags |= _mesa_program_state_flags(stateTokens);
 427
 428    /* free name string here since we duplicated it in add_parameter() */
 429    _mesa_free((void *) name);
 430
 431    return index;
 432 }
 433
 434
 435 /**
 436  * Lookup a parameter value by name in the given parameter list.
 437  * \return pointer to the float[4] values.
 438  */
 439 GLfloat *
 440 _mesa_lookup_parameter_value(const struct gl_program_parameter_list *paramList,
 441                              GLsizei nameLen, const char *name)
 442 {
 443    GLuint i = _mesa_lookup_parameter_index(paramList, nameLen, name);
 444    if (i < 0)
 445       return NULL;
 446    else
 447       return paramList->ParameterValues[i];
 448 }
 449
 450
 451 /**
 452  * Given a program parameter name, find its position in the list of parameters.
 453  * \param paramList  the parameter list to search
 454  * \param nameLen  length of name (in chars).
 455  *                 If length is negative, assume that name is null-terminated.
 456  * \param name  the name to search for
 457  * \return index of parameter in the list.
 458  */
 459 GLint
 460 _mesa_lookup_parameter_index(const struct gl_program_parameter_list *paramList,
 461                              GLsizei nameLen, const char *name)
 462 {
 463    GLint i;
 464
 465    if (!paramList)
 466       return -1;
 467
 468    if (nameLen == -1) {
 469       /* name is null-terminated */
 470       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 471          if (paramList->Parameters[i].Name &&
 472              _mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 473             return i;
 474       }
 475    }
 476    else {
 477       /* name is not null-terminated, use nameLen */
 478       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 479          if (paramList->Parameters[i].Name &&
 480              _mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 481              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 482             return i;
 483       }
 484    }
 485    return -1;
 486 }
 487
 488
 489 /**
 490  * Look for a float vector in the given parameter list.  The float vector
 491  * may be of length 1, 2, 3 or 4.  If swizzleOut is non-null, we'll try
 492  * swizzling to find a match.
 493  * \param list  the parameter list to search
 494  * \param v  the float vector to search for
 495  * \param size  number of element in v
 496  * \param posOut  returns the position of the constant, if found
 497  * \param swizzleOut  returns a swizzle mask describing location of the
 498  *                    vector elements if found.
 499  * \return GL_TRUE if found, GL_FALSE if not found
 500  */
 501 GLboolean
 502 _mesa_lookup_parameter_constant(const struct gl_program_parameter_list *list,
 503                                 const GLfloat v[], GLuint vSize,
 504                                 GLint *posOut, GLuint *swizzleOut)
 505 {
 506    GLuint i;
 507
 508    assert(vSize >= 1);
 509    assert(vSize <= 4);
 510
 511    if (!list)
 512       return -1;
 513
 514    for (i = 0; i < list->NumParameters; i++) {
 515       if (list->Parameters[i].Type == PROGRAM_CONSTANT) {
 516          if (!swizzleOut) {
 517             /* swizzle not allowed */
 518             GLuint j, match = 0;
 519             for (j = 0; j < vSize; j++) {
 520                if (v[j] == list->ParameterValues[i][j])
 521                   match++;
 522             }
 523             if (match == vSize) {
 524                *posOut = i;
 525                return GL_TRUE;
 526             }
 527          }
 528          else {
 529             /* try matching w/ swizzle */
 530              if (vSize == 1) {
 531                 /* look for v[0] anywhere within float[4] value */
 532                 GLuint j;
 533                 for (j = 0; j < 4; j++) {
 534                    if (list->ParameterValues[i][j] == v[0]) {
 535                       /* found it */
 536                       *posOut = i;
 537                       *swizzleOut = MAKE_SWIZZLE4(j, j, j, j);
 538                       return GL_TRUE;
 539                    }
 540                 }
 541              }
 542              else if (vSize <= list->Parameters[i].Size) {
 543                 /* see if we can match this constant (with a swizzle) */
 544                 GLuint swz[4];
 545                 GLuint match = 0, j, k;
 546                 for (j = 0; j < vSize; j++) {
 547                    if (v[j] == list->ParameterValues[i][j]) {
 548                       swz[j] = j;
 549                       match++;
 550                    }
 551                    else {
 552                       for (k = 0; k < list->Parameters[i].Size; k++) {
 553                          if (v[j] == list->ParameterValues[i][k]) {
 554                             swz[j] = k;
 555                             match++;
 556                             break;
 557                          }
 558                       }
 559                    }
 560                 }
 561                 /* smear last value to remaining positions */
 562                 for (; j < 4; j++)
 563                    swz[j] = swz[j-1];
 564
 565                 if (match == vSize) {
 566                    *posOut = i;
 567                    *swizzleOut = MAKE_SWIZZLE4(swz[0], swz[1], swz[2], swz[3]);
 568                    return GL_TRUE;
 569                 }
 570              }
 571          }
 572       }
 573    }
 574
 575    *posOut = -1;
 576    return GL_FALSE;
 577 }
 578
 579
 580 struct gl_program_parameter_list *
 581 _mesa_clone_parameter_list(const struct gl_program_parameter_list *list)
 582 {
 583    struct gl_program_parameter_list *clone;
 584    GLuint i;
 585
 586    clone = _mesa_new_parameter_list();
 587    if (!clone)
 588       return NULL;
 589
 590    /** Not too efficient, but correct */
 591    for (i = 0; i < list->NumParameters; i++) {
 592       struct gl_program_parameter *p = list->Parameters + i;
 593       GLuint size = MIN2(p->Size, 4);
 594       GLint j = _mesa_add_parameter(clone, p->Type, p->Name, size, p->DataType,
 595                                     list->ParameterValues[i], NULL);
 596       ASSERT(j >= 0);
 597       /* copy state indexes */
 598       if (p->Type == PROGRAM_STATE_VAR) {
 599          GLint k;
 600          struct gl_program_parameter *q = clone->Parameters + j;
 601          for (k = 0; k < STATE_LENGTH; k++) {
 602             q->StateIndexes[k] = p->StateIndexes[k];
 603          }
 604       }
 605       else {
 606          clone->Parameters[j].Size = p->Size;
 607       }
 608    }
 609
 610    clone->StateFlags = list->StateFlags;
 611
 612    return clone;
 613 }
 614
 615
 616 /**
 617  * Return a new parameter list which is listA + listB.
 618  */
 619 struct gl_program_parameter_list *
 620 _mesa_combine_parameter_lists(const struct gl_program_parameter_list *listA,
 621                               const struct gl_program_parameter_list *listB)
 622 {
 623    struct gl_program_parameter_list *list;
 624
 625    if (listA) {
 626       list = _mesa_clone_parameter_list(listA);
 627       if (list && listB) {
 628          GLuint i;
 629          for (i = 0; i < listB->NumParameters; i++) {
 630             struct gl_program_parameter *param = listB->Parameters + i;
 631             _mesa_add_parameter(list, param->Type, param->Name, param->Size,
 632                                 param->DataType,
 633                                 listB->ParameterValues[i],
 634                                 param->StateIndexes);
 635          }
 636       }
 637    }
 638    else if (listB) {
 639       list = _mesa_clone_parameter_list(listB);
 640    }
 641    else {
 642       list = NULL;
 643    }
 644    return list;
 645 }
 646
 647
 648
 649 /**
 650  * Find longest name of all uniform parameters in list.
 651  */
 652 GLuint
 653 _mesa_longest_parameter_name(const struct gl_program_parameter_list *list,
 654                              enum register_file type)
 655 {
 656    GLuint i, maxLen = 0;
 657    if (!list)
 658       return 0;
 659    for (i = 0; i < list->NumParameters; i++) {
 660       if (list->Parameters[i].Type == type) {
 661          GLuint len = _mesa_strlen(list->Parameters[i].Name);
 662          if (len > maxLen)
 663             maxLen = len;
 664       }
 665    }
 666    return maxLen;
 667 }
 668
 669
 670 /**
 671  * Count the number of parameters in the last that match the given type.
 672  */
 673 GLuint
 674 _mesa_num_parameters_of_type(const struct gl_program_parameter_list *list,
 675                              enum register_file type)
 676 {
 677    GLuint i, count = 0;
 678    if (list) {
 679       for (i = 0; i < list->NumParameters; i++) {
 680          if (list->Parameters[i].Type == type)
 681             count++;
 682       }
 683    }
 684    return count;
 685 }