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 /**
  67  * Add a new parameter to a parameter list.
  68  * Note that parameter values are usually 4-element GLfloat vectors.
  69  * When size > 4 we'll allocate a sequential block of parameters to
  70  * store all the values (in blocks of 4).
  71  *
  72  * \param paramList  the list to add the parameter to
  73  * \param type  type of parameter, such as
  74  * \param name  the parameter name, will be duplicated/copied!
  75  * \param size  number of elements in 'values' vector (1..4, or more)
  76  * \param values  initial parameter value, up to 4 GLfloats, or NULL
  77  * \param state  state indexes, or NULL
  78  * \return  index of new parameter in the list, or -1 if error (out of mem)
  79  */
  80 GLint
  81 _mesa_add_parameter(struct gl_program_parameter_list *paramList,
  82                     enum register_file type, const char *name,
  83                     GLuint size, GLenum datatype, const GLfloat *values,
  84                     const gl_state_index state[STATE_LENGTH])
  85 {
  86    const GLuint oldNum = paramList->NumParameters;
  87    const GLuint sz4 = (size + 3) / 4; /* no. of new param slots needed */
  88
  89    assert(size > 0);
  90
  91    if (oldNum + sz4 > paramList->Size) {
  92       /* Need to grow the parameter list array (alloc some extra) */
  93       paramList->Size = paramList->Size + 4 * sz4;
  94
  95       /* realloc arrays */
  96       paramList->Parameters = (struct gl_program_parameter *)
  97          _mesa_realloc(paramList->Parameters,
  98                        oldNum * sizeof(struct gl_program_parameter),
  99                        paramList->Size * sizeof(struct gl_program_parameter));
 100
 101       paramList->ParameterValues = (GLfloat (*)[4])
 102          _mesa_align_realloc(paramList->ParameterValues,         /* old buf */
 103                              oldNum * 4 * sizeof(GLfloat),      /* old size */
 104                              paramList->Size * 4 *sizeof(GLfloat), /* new sz */
 105                              16);
 106    }
 107
 108    if (!paramList->Parameters ||
 109        !paramList->ParameterValues) {
 110       /* out of memory */
 111       paramList->NumParameters = 0;
 112       paramList->Size = 0;
 113       return -1;
 114    }
 115    else {
 116       GLuint i;
 117
 118       paramList->NumParameters = oldNum + sz4;
 119
 120       _mesa_memset(&paramList->Parameters[oldNum], 0,
 121                    sz4 * sizeof(struct gl_program_parameter));
 122
 123       for (i = 0; i < sz4; i++) {
 124          struct gl_program_parameter *p = paramList->Parameters + oldNum + i;
 125          p->Name = name ? _mesa_strdup(name) : NULL;
 126          p->Type = type;
 127          p->Size = size;
 128          p->DataType = datatype;
 129          if (values) {
 130             COPY_4V(paramList->ParameterValues[oldNum + i], values);
 131             values += 4;
 132          }
 133          else {
 134             /* silence valgrind */
 135             ASSIGN_4V(paramList->ParameterValues[oldNum + i], 0, 0, 0, 0);
 136          }
 137          size -= 4;
 138       }
 139
 140       if (state) {
 141          for (i = 0; i < STATE_LENGTH; i++)
 142             paramList->Parameters[oldNum].StateIndexes[i] = state[i];
 143       }
 144
 145       return (GLint) oldNum;
 146    }
 147 }
 148
 149
 150 /**
 151  * Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
 152  * \return index of the new entry in the parameter list
 153  */
 154 GLint
 155 _mesa_add_named_parameter(struct gl_program_parameter_list *paramList,
 156                           const char *name, const GLfloat values[4])
 157 {
 158    return _mesa_add_parameter(paramList, PROGRAM_NAMED_PARAM, name,
 159                               4, GL_NONE, values, NULL);
 160
 161 }
 162
 163
 164 /**
 165  * Add a new named constant to the parameter list.
 166  * This will be used when the program contains something like this:
 167  *    PARAM myVals = { 0, 1, 2, 3 };
 168  *
 169  * \param paramList  the parameter list
 170  * \param name  the name for the constant
 171  * \param values  four float values
 172  * \return index/position of the new parameter in the parameter list
 173  */
 174 GLint
 175 _mesa_add_named_constant(struct gl_program_parameter_list *paramList,
 176                          const char *name, const GLfloat values[4],
 177                          GLuint size)
 178 {
 179 #if 0 /* disable this for now -- we need to save the name! */
 180    GLint pos;
 181    GLuint swizzle;
 182    ASSERT(size == 4); /* XXX future feature */
 183    /* check if we already have this constant */
 184    if (_mesa_lookup_parameter_constant(paramList, values, 4, &pos, &swizzle)) {
 185       return pos;
 186    }
 187 #endif
 188    size = 4; /** XXX fix */
 189    return _mesa_add_parameter(paramList, PROGRAM_CONSTANT, name,
 190                               size, GL_NONE, values, NULL);
 191 }
 192
 193
 194 /**
 195  * Add a new unnamed constant to the parameter list.  This will be used
 196  * when a fragment/vertex program contains something like this:
 197  *    MOV r, { 0, 1, 2, 3 };
 198  * We'll search the parameter list for an existing instance of the
 199  * constant.  If swizzleOut is non-null, we'll try swizzling when
 200  * looking for a match.
 201  *
 202  * \param paramList  the parameter list
 203  * \param values  four float values
 204  * \param swizzleOut  returns swizzle mask for accessing the constant
 205  * \return index/position of the new parameter in the parameter list.
 206  */
 207 GLint
 208 _mesa_add_unnamed_constant(struct gl_program_parameter_list *paramList,
 209                            const GLfloat values[4], GLuint size,
 210                            GLuint *swizzleOut)
 211 {
 212    GLint pos;
 213    ASSERT(size >= 1);
 214    ASSERT(size <= 4);
 215
 216    if (_mesa_lookup_parameter_constant(paramList, values,
 217                                        size, &pos, swizzleOut)) {
 218       return pos;
 219    }
 220
 221    /* Look for empty space in an already unnamed constant parameter
 222     * to add this constant.  This will only work for single-element
 223     * constants because we rely on smearing (i.e. .yyyy or .zzzz).
 224     */
 225    if (size == 1 && swizzleOut) {
 226       for (pos = 0; pos < (GLint) paramList->NumParameters; pos++) {
 227          struct gl_program_parameter *p = paramList->Parameters + pos;
 228          if (p->Type == PROGRAM_CONSTANT && p->Size + size <= 4) {
 229             /* ok, found room */
 230             GLfloat *pVal = paramList->ParameterValues[pos];
 231             GLuint swz = p->Size; /* 1, 2 or 3 for Y, Z, W */
 232             pVal[p->Size] = values[0];
 233             p->Size++;
 234             *swizzleOut = MAKE_SWIZZLE4(swz, swz, swz, swz);
 235             return pos;
 236          }
 237       }
 238    }
 239
 240    /* add a new parameter to store this constant */
 241    pos = _mesa_add_parameter(paramList, PROGRAM_CONSTANT, NULL,
 242                              size, GL_NONE, values, NULL);
 243    if (pos >= 0 && swizzleOut) {
 244       if (size == 1)
 245          *swizzleOut = SWIZZLE_XXXX;
 246       else
 247          *swizzleOut = SWIZZLE_NOOP;
 248    }
 249    return pos;
 250 }
 251
 252
 253 /**
 254  * Add a uniform to the parameter list.
 255  * Note that if the uniform is an array, size may be greater than
 256  * what's implied by the datatype.
 257  * \param name  uniform's name
 258  * \param size  number of floats to allocate
 259  * \param datatype  GL_FLOAT_VEC3, GL_FLOAT_MAT4, etc.
 260  */
 261 GLint
 262 _mesa_add_uniform(struct gl_program_parameter_list *paramList,
 263                   const char *name, GLuint size, GLenum datatype)
 264 {
 265    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 266    ASSERT(datatype != GL_NONE);
 267    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_UNIFORM) {
 268       ASSERT(paramList->Parameters[i].Size == size);
 269       ASSERT(paramList->Parameters[i].DataType == datatype);
 270       /* already in list */
 271       return i;
 272    }
 273    else {
 274       i = _mesa_add_parameter(paramList, PROGRAM_UNIFORM, name,
 275                               size, datatype, NULL, NULL);
 276       return i;
 277    }
 278 }
 279
 280
 281 /**
 282  * Add a sampler to the parameter list.
 283  * \param name  uniform's name
 284  * \param datatype  GL_SAMPLER_2D, GL_SAMPLER_2D_RECT_ARB, etc.
 285  * \param index  the sampler number (as seen in TEX instructions)
 286  * \return  sampler index (starting at zero) or -1 if error
 287  */
 288 GLint
 289 _mesa_add_sampler(struct gl_program_parameter_list *paramList,
 290                   const char *name, GLenum datatype)
 291 {
 292    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 293    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_SAMPLER) {
 294       ASSERT(paramList->Parameters[i].Size == 1);
 295       ASSERT(paramList->Parameters[i].DataType == datatype);
 296       /* already in list */
 297       return (GLint) paramList->ParameterValues[i][0];
 298    }
 299    else {
 300       const GLint size = 1; /* a sampler is basically a texture unit number */
 301       GLfloat value;
 302       GLint numSamplers = 0;
 303       for (i = 0; i < paramList->NumParameters; i++) {
 304          if (paramList->Parameters[i].Type == PROGRAM_SAMPLER)
 305             numSamplers++;
 306       }
 307       value = (GLfloat) numSamplers;
 308       (void) _mesa_add_parameter(paramList, PROGRAM_SAMPLER, name,
 309                                  size, datatype, &value, NULL);
 310       return numSamplers;
 311    }
 312 }
 313
 314
 315 /**
 316  * Add parameter representing a varying variable.
 317  */
 318 GLint
 319 _mesa_add_varying(struct gl_program_parameter_list *paramList,
 320                   const char *name, GLuint size)
 321 {
 322    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 323    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_VARYING) {
 324       /* already in list */
 325       return i;
 326    }
 327    else {
 328       assert(size == 4);
 329       i = _mesa_add_parameter(paramList, PROGRAM_VARYING, name,
 330                               size, GL_NONE, NULL, NULL);
 331       return i;
 332    }
 333 }
 334
 335
 336 /**
 337  * Add parameter representing a vertex program attribute.
 338  * \param size  size of attribute (in floats), may be -1 if unknown
 339  * \param attrib  the attribute index, or -1 if unknown
 340  */
 341 GLint
 342 _mesa_add_attribute(struct gl_program_parameter_list *paramList,
 343                     const char *name, GLint size, GLint attrib)
 344 {
 345    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 346    if (i >= 0) {
 347       /* replace */
 348       if (attrib < 0)
 349          attrib = i;
 350       paramList->Parameters[i].StateIndexes[0] = attrib;
 351    }
 352    else {
 353       /* add */
 354       gl_state_index state[STATE_LENGTH];
 355       state[0] = (gl_state_index) attrib;
 356       if (size < 0)
 357          size = 4;
 358       i = _mesa_add_parameter(paramList, PROGRAM_INPUT, name,
 359                               size, GL_NONE, NULL, state);
 360    }
 361    return i;
 362 }
 363
 364
 365
 366 #if 0 /* not used yet */
 367 /**
 368  * Returns the number of 4-component registers needed to store a piece
 369  * of GL state.  For matrices this may be as many as 4 registers,
 370  * everything else needs
 371  * just 1 register.
 372  */
 373 static GLuint
 374 sizeof_state_reference(const GLint *stateTokens)
 375 {
 376    if (stateTokens[0] == STATE_MATRIX) {
 377       GLuint rows = stateTokens[4] - stateTokens[3] + 1;
 378       assert(rows >= 1);
 379       assert(rows <= 4);
 380       return rows;
 381    }
 382    else {
 383       return 1;
 384    }
 385 }
 386 #endif
 387
 388
 389 /**
 390  * Add a new state reference to the parameter list.
 391  * This will be used when the program contains something like this:
 392  *    PARAM ambient = state.material.front.ambient;
 393  *
 394  * \param paramList  the parameter list
 395  * \param stateTokens  an array of 5 (STATE_LENGTH) state tokens
 396  * \return index of the new parameter.
 397  */
 398 GLint
 399 _mesa_add_state_reference(struct gl_program_parameter_list *paramList,
 400                           const gl_state_index stateTokens[STATE_LENGTH])
 401 {
 402    const GLuint size = 4; /* XXX fix */
 403    const char *name;
 404    GLint index;
 405
 406    /* Check if the state reference is already in the list */
 407    for (index = 0; index < (GLint) paramList->NumParameters; index++) {
 408       GLuint i, match = 0;
 409       for (i = 0; i < STATE_LENGTH; i++) {
 410          if (paramList->Parameters[index].StateIndexes[i] == stateTokens[i]) {
 411             match++;
 412          }
 413          else {
 414             break;
 415          }
 416       }
 417       if (match == STATE_LENGTH) {
 418          /* this state reference is already in the parameter list */
 419          return index;
 420       }
 421    }
 422
 423    name = _mesa_program_state_string(stateTokens);
 424    index = _mesa_add_parameter(paramList, PROGRAM_STATE_VAR, name,
 425                                size, GL_NONE,
 426                                NULL, (gl_state_index *) stateTokens);
 427    paramList->StateFlags |= _mesa_program_state_flags(stateTokens);
 428
 429    /* free name string here since we duplicated it in add_parameter() */
 430    _mesa_free((void *) name);
 431
 432    return index;
 433 }
 434
 435
 436 /**
 437  * Lookup a parameter value by name in the given parameter list.
 438  * \return pointer to the float[4] values.
 439  */
 440 GLfloat *
 441 _mesa_lookup_parameter_value(const struct gl_program_parameter_list *paramList,
 442                              GLsizei nameLen, const char *name)
 443 {
 444    GLuint i = _mesa_lookup_parameter_index(paramList, nameLen, name);
 445    if (i < 0)
 446       return NULL;
 447    else
 448       return paramList->ParameterValues[i];
 449 }
 450
 451
 452 /**
 453  * Given a program parameter name, find its position in the list of parameters.
 454  * \param paramList  the parameter list to search
 455  * \param nameLen  length of name (in chars).
 456  *                 If length is negative, assume that name is null-terminated.
 457  * \param name  the name to search for
 458  * \return index of parameter in the list.
 459  */
 460 GLint
 461 _mesa_lookup_parameter_index(const struct gl_program_parameter_list *paramList,
 462                              GLsizei nameLen, const char *name)
 463 {
 464    GLint i;
 465
 466    if (!paramList)
 467       return -1;
 468
 469    if (nameLen == -1) {
 470       /* name is null-terminated */
 471       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 472          if (paramList->Parameters[i].Name &&
 473              _mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 474             return i;
 475       }
 476    }
 477    else {
 478       /* name is not null-terminated, use nameLen */
 479       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 480          if (paramList->Parameters[i].Name &&
 481              _mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 482              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 483             return i;
 484       }
 485    }
 486    return -1;
 487 }
 488
 489
 490 /**
 491  * Look for a float vector in the given parameter list.  The float vector
 492  * may be of length 1, 2, 3 or 4.  If swizzleOut is non-null, we'll try
 493  * swizzling to find a match.
 494  * \param list  the parameter list to search
 495  * \param v  the float vector to search for
 496  * \param size  number of element in v
 497  * \param posOut  returns the position of the constant, if found
 498  * \param swizzleOut  returns a swizzle mask describing location of the
 499  *                    vector elements if found.
 500  * \return GL_TRUE if found, GL_FALSE if not found
 501  */
 502 GLboolean
 503 _mesa_lookup_parameter_constant(const struct gl_program_parameter_list *list,
 504                                 const GLfloat v[], GLuint vSize,
 505                                 GLint *posOut, GLuint *swizzleOut)
 506 {
 507    GLuint i;
 508
 509    assert(vSize >= 1);
 510    assert(vSize <= 4);
 511
 512    if (!list)
 513       return -1;
 514
 515    for (i = 0; i < list->NumParameters; i++) {
 516       if (list->Parameters[i].Type == PROGRAM_CONSTANT) {
 517          if (!swizzleOut) {
 518             /* swizzle not allowed */
 519             GLuint j, match = 0;
 520             for (j = 0; j < vSize; j++) {
 521                if (v[j] == list->ParameterValues[i][j])
 522                   match++;
 523             }
 524             if (match == vSize) {
 525                *posOut = i;
 526                return GL_TRUE;
 527             }
 528          }
 529          else {
 530             /* try matching w/ swizzle */
 531              if (vSize == 1) {
 532                 /* look for v[0] anywhere within float[4] value */
 533                 GLuint j;
 534                 for (j = 0; j < 4; j++) {
 535                    if (list->ParameterValues[i][j] == v[0]) {
 536                       /* found it */
 537                       *posOut = i;
 538                       *swizzleOut = MAKE_SWIZZLE4(j, j, j, j);
 539                       return GL_TRUE;
 540                    }
 541                 }
 542              }
 543              else if (vSize <= list->Parameters[i].Size) {
 544                 /* see if we can match this constant (with a swizzle) */
 545                 GLuint swz[4];
 546                 GLuint match = 0, j, k;
 547                 for (j = 0; j < vSize; j++) {
 548                    if (v[j] == list->ParameterValues[i][j]) {
 549                       swz[j] = j;
 550                       match++;
 551                    }
 552                    else {
 553                       for (k = 0; k < list->Parameters[i].Size; k++) {
 554                          if (v[j] == list->ParameterValues[i][k]) {
 555                             swz[j] = k;
 556                             match++;
 557                             break;
 558                          }
 559                       }
 560                    }
 561                 }
 562                 /* smear last value to remaining positions */
 563                 for (; j < 4; j++)
 564                    swz[j] = swz[j-1];
 565
 566                 if (match == vSize) {
 567                    *posOut = i;
 568                    *swizzleOut = MAKE_SWIZZLE4(swz[0], swz[1], swz[2], swz[3]);
 569                    return GL_TRUE;
 570                 }
 571              }
 572          }
 573       }
 574    }
 575
 576    *posOut = -1;
 577    return GL_FALSE;
 578 }
 579
 580
 581 struct gl_program_parameter_list *
 582 _mesa_clone_parameter_list(const struct gl_program_parameter_list *list)
 583 {
 584    struct gl_program_parameter_list *clone;
 585    GLuint i;
 586
 587    clone = _mesa_new_parameter_list();
 588    if (!clone)
 589       return NULL;
 590
 591    /** Not too efficient, but correct */
 592    for (i = 0; i < list->NumParameters; i++) {
 593       struct gl_program_parameter *p = list->Parameters + i;
 594       GLuint size = MIN2(p->Size, 4);
 595       GLint j = _mesa_add_parameter(clone, p->Type, p->Name, size, p->DataType,
 596                                     list->ParameterValues[i], NULL);
 597       ASSERT(j >= 0);
 598       /* copy state indexes */
 599       if (p->Type == PROGRAM_STATE_VAR) {
 600          GLint k;
 601          struct gl_program_parameter *q = clone->Parameters + j;
 602          for (k = 0; k < STATE_LENGTH; k++) {
 603             q->StateIndexes[k] = p->StateIndexes[k];
 604          }
 605       }
 606       else {
 607          clone->Parameters[j].Size = p->Size;
 608       }
 609    }
 610
 611    clone->StateFlags = list->StateFlags;
 612
 613    return clone;
 614 }
 615
 616
 617 /**
 618  * Return a new parameter list which is listA + listB.
 619  */
 620 struct gl_program_parameter_list *
 621 _mesa_combine_parameter_lists(const struct gl_program_parameter_list *listA,
 622                               const struct gl_program_parameter_list *listB)
 623 {
 624    struct gl_program_parameter_list *list;
 625
 626    if (listA) {
 627       list = _mesa_clone_parameter_list(listA);
 628       if (list && listB) {
 629          GLuint i;
 630          for (i = 0; i < listB->NumParameters; i++) {
 631             struct gl_program_parameter *param = listB->Parameters + i;
 632             _mesa_add_parameter(list, param->Type, param->Name, param->Size,
 633                                 param->DataType,
 634                                 listB->ParameterValues[i],
 635                                 param->StateIndexes);
 636          }
 637       }
 638    }
 639    else if (listB) {
 640       list = _mesa_clone_parameter_list(listB);
 641    }
 642    else {
 643       list = NULL;
 644    }
 645    return list;
 646 }
 647
 648
 649
 650 /**
 651  * Find longest name of all uniform parameters in list.
 652  */
 653 GLuint
 654 _mesa_longest_parameter_name(const struct gl_program_parameter_list *list,
 655                              enum register_file type)
 656 {
 657    GLuint i, maxLen = 0;
 658    if (!list)
 659       return 0;
 660    for (i = 0; i < list->NumParameters; i++) {
 661       if (list->Parameters[i].Type == type) {
 662          GLuint len = _mesa_strlen(list->Parameters[i].Name);
 663          if (len > maxLen)
 664             maxLen = len;
 665       }
 666    }
 667    return maxLen;
 668 }
 669
 670
 671 /**
 672  * Count the number of parameters in the last that match the given type.
 673  */
 674 GLuint
 675 _mesa_num_parameters_of_type(const struct gl_program_parameter_list *list,
 676                              enum register_file type)
 677 {
 678    GLuint i, count = 0;
 679    if (list) {
 680       for (i = 0; i < list->NumParameters; i++) {
 681          if (list->Parameters[i].Type == type)
 682             count++;
 683       }
 684    }
 685    return count;
 686 }