src/mesa/shader/prog_parameter.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.3
   4  *
   5  * Copyright (C) 1999-2008  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 "main/glheader.h"
  33 #include "main/imports.h"
  34 #include "main/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                     GLbitfield flags)
  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          p->Flags = flags;
 130          if (values) {
 131             COPY_4V(paramList->ParameterValues[oldNum + i], values);
 132             values += 4;
 133             p->Initialized = GL_TRUE;
 134          }
 135          else {
 136             /* silence valgrind */
 137             ASSIGN_4V(paramList->ParameterValues[oldNum + i], 0, 0, 0, 0);
 138          }
 139          size -= 4;
 140       }
 141
 142       if (state) {
 143          for (i = 0; i < STATE_LENGTH; i++)
 144             paramList->Parameters[oldNum].StateIndexes[i] = state[i];
 145       }
 146
 147       return (GLint) oldNum;
 148    }
 149 }
 150
 151
 152 /**
 153  * Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
 154  * \return index of the new entry in the parameter list
 155  */
 156 GLint
 157 _mesa_add_named_parameter(struct gl_program_parameter_list *paramList,
 158                           const char *name, const GLfloat values[4])
 159 {
 160    return _mesa_add_parameter(paramList, PROGRAM_NAMED_PARAM, name,
 161                               4, GL_NONE, values, NULL, 0x0);
 162
 163 }
 164
 165
 166 /**
 167  * Add a new named constant to the parameter list.
 168  * This will be used when the program contains something like this:
 169  *    PARAM myVals = { 0, 1, 2, 3 };
 170  *
 171  * \param paramList  the parameter list
 172  * \param name  the name for the constant
 173  * \param values  four float values
 174  * \return index/position of the new parameter in the parameter list
 175  */
 176 GLint
 177 _mesa_add_named_constant(struct gl_program_parameter_list *paramList,
 178                          const char *name, const GLfloat values[4],
 179                          GLuint size)
 180 {
 181 #if 0 /* disable this for now -- we need to save the name! */
 182    GLint pos;
 183    GLuint swizzle;
 184    ASSERT(size == 4); /* XXX future feature */
 185    /* check if we already have this constant */
 186    if (_mesa_lookup_parameter_constant(paramList, values, 4, &pos, &swizzle)) {
 187       return pos;
 188    }
 189 #endif
 190    return _mesa_add_parameter(paramList, PROGRAM_CONSTANT, name,
 191                               size, GL_NONE, values, NULL, 0x0);
 192 }
 193
 194
 195 /**
 196  * Add a new unnamed constant to the parameter list.  This will be used
 197  * when a fragment/vertex program contains something like this:
 198  *    MOV r, { 0, 1, 2, 3 };
 199  * We'll search the parameter list for an existing instance of the
 200  * constant.  If swizzleOut is non-null, we'll try swizzling when
 201  * looking for a match.
 202  *
 203  * \param paramList  the parameter list
 204  * \param values  four float values
 205  * \param swizzleOut  returns swizzle mask for accessing the constant
 206  * \return index/position of the new parameter in the parameter list.
 207  */
 208 GLint
 209 _mesa_add_unnamed_constant(struct gl_program_parameter_list *paramList,
 210                            const GLfloat values[4], GLuint size,
 211                            GLuint *swizzleOut)
 212 {
 213    GLint pos;
 214    ASSERT(size >= 1);
 215    ASSERT(size <= 4);
 216
 217    if (_mesa_lookup_parameter_constant(paramList, values,
 218                                        size, &pos, swizzleOut)) {
 219       return pos;
 220    }
 221
 222    /* Look for empty space in an already unnamed constant parameter
 223     * to add this constant.  This will only work for single-element
 224     * constants because we rely on smearing (i.e. .yyyy or .zzzz).
 225     */
 226    if (size == 1 && swizzleOut) {
 227       for (pos = 0; pos < (GLint) paramList->NumParameters; pos++) {
 228          struct gl_program_parameter *p = paramList->Parameters + pos;
 229          if (p->Type == PROGRAM_CONSTANT && p->Size + size <= 4) {
 230             /* ok, found room */
 231             GLfloat *pVal = paramList->ParameterValues[pos];
 232             GLuint swz = p->Size; /* 1, 2 or 3 for Y, Z, W */
 233             pVal[p->Size] = values[0];
 234             p->Size++;
 235             *swizzleOut = MAKE_SWIZZLE4(swz, swz, swz, swz);
 236             return pos;
 237          }
 238       }
 239    }
 240
 241    /* add a new parameter to store this constant */
 242    pos = _mesa_add_parameter(paramList, PROGRAM_CONSTANT, NULL,
 243                              size, GL_NONE, values, NULL, 0x0);
 244    if (pos >= 0 && swizzleOut) {
 245       if (size == 1)
 246          *swizzleOut = SWIZZLE_XXXX;
 247       else
 248          *swizzleOut = SWIZZLE_NOOP;
 249    }
 250    return pos;
 251 }
 252
 253
 254 /**
 255  * Add a uniform to the parameter list.
 256  * Note that if the uniform is an array, size may be greater than
 257  * what's implied by the datatype.
 258  * \param name  uniform's name
 259  * \param size  number of floats to allocate
 260  * \param datatype  GL_FLOAT_VEC3, GL_FLOAT_MAT4, etc.
 261  */
 262 GLint
 263 _mesa_add_uniform(struct gl_program_parameter_list *paramList,
 264                   const char *name, GLuint size, GLenum datatype,
 265                   const GLfloat *values)
 266 {
 267    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 268    ASSERT(datatype != GL_NONE);
 269    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_UNIFORM) {
 270       ASSERT(paramList->Parameters[i].Size == size);
 271       ASSERT(paramList->Parameters[i].DataType == datatype);
 272       /* already in list */
 273       return i;
 274    }
 275    else {
 276       i = _mesa_add_parameter(paramList, PROGRAM_UNIFORM, name,
 277                               size, datatype, values, NULL, 0x0);
 278       return i;
 279    }
 280 }
 281
 282
 283 /**
 284  * Mark the named uniform as 'used'.
 285  */
 286 void
 287 _mesa_use_uniform(struct gl_program_parameter_list *paramList,
 288                   const char *name)
 289 {
 290    GLuint i;
 291    for (i = 0; i < paramList->NumParameters; i++) {
 292       struct gl_program_parameter *p = paramList->Parameters + i;
 293       if (p->Type == PROGRAM_UNIFORM && _mesa_strcmp(p->Name, name) == 0) {
 294          p->Used = GL_TRUE;
 295          /* Note that large uniforms may occupy several slots so we're
 296           * not done searching yet.
 297           */
 298       }
 299    }
 300 }
 301
 302
 303 /**
 304  * Add a sampler to the parameter list.
 305  * \param name  uniform's name
 306  * \param datatype  GL_SAMPLER_2D, GL_SAMPLER_2D_RECT_ARB, etc.
 307  * \param index  the sampler number (as seen in TEX instructions)
 308  * \return  sampler index (starting at zero) or -1 if error
 309  */
 310 GLint
 311 _mesa_add_sampler(struct gl_program_parameter_list *paramList,
 312                   const char *name, GLenum datatype)
 313 {
 314    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 315    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_SAMPLER) {
 316       ASSERT(paramList->Parameters[i].Size == 1);
 317       ASSERT(paramList->Parameters[i].DataType == datatype);
 318       /* already in list */
 319       return (GLint) paramList->ParameterValues[i][0];
 320    }
 321    else {
 322       GLuint i;
 323       const GLint size = 1; /* a sampler is basically a texture unit number */
 324       GLfloat value;
 325       GLint numSamplers = 0;
 326       for (i = 0; i < paramList->NumParameters; i++) {
 327          if (paramList->Parameters[i].Type == PROGRAM_SAMPLER)
 328             numSamplers++;
 329       }
 330       value = (GLfloat) numSamplers;
 331       (void) _mesa_add_parameter(paramList, PROGRAM_SAMPLER, name,
 332                                  size, datatype, &value, NULL, 0x0);
 333       return numSamplers;
 334    }
 335 }
 336
 337
 338 /**
 339  * Add parameter representing a varying variable.
 340  */
 341 GLint
 342 _mesa_add_varying(struct gl_program_parameter_list *paramList,
 343                   const char *name, GLuint size, GLbitfield flags)
 344 {
 345    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 346    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_VARYING) {
 347       /* already in list */
 348       return i;
 349    }
 350    else {
 351       /*assert(size == 4);*/
 352       i = _mesa_add_parameter(paramList, PROGRAM_VARYING, name,
 353                               size, GL_NONE, NULL, NULL, flags);
 354       return i;
 355    }
 356 }
 357
 358
 359 /**
 360  * Add parameter representing a vertex program attribute.
 361  * \param size  size of attribute (in floats), may be -1 if unknown
 362  * \param attrib  the attribute index, or -1 if unknown
 363  */
 364 GLint
 365 _mesa_add_attribute(struct gl_program_parameter_list *paramList,
 366                     const char *name, GLint size, GLenum datatype, GLint attrib)
 367 {
 368    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 369    if (i >= 0) {
 370       /* replace */
 371       if (attrib < 0)
 372          attrib = i;
 373       paramList->Parameters[i].StateIndexes[0] = attrib;
 374    }
 375    else {
 376       /* add */
 377       gl_state_index state[STATE_LENGTH];
 378       state[0] = (gl_state_index) attrib;
 379       if (size < 0)
 380          size = 4;
 381       i = _mesa_add_parameter(paramList, PROGRAM_INPUT, name,
 382                               size, datatype, NULL, state, 0x0);
 383    }
 384    return i;
 385 }
 386
 387
 388
 389 #if 0 /* not used yet */
 390 /**
 391  * Returns the number of 4-component registers needed to store a piece
 392  * of GL state.  For matrices this may be as many as 4 registers,
 393  * everything else needs
 394  * just 1 register.
 395  */
 396 static GLuint
 397 sizeof_state_reference(const GLint *stateTokens)
 398 {
 399    if (stateTokens[0] == STATE_MATRIX) {
 400       GLuint rows = stateTokens[4] - stateTokens[3] + 1;
 401       assert(rows >= 1);
 402       assert(rows <= 4);
 403       return rows;
 404    }
 405    else {
 406       return 1;
 407    }
 408 }
 409 #endif
 410
 411
 412 /**
 413  * Add a new state reference to the parameter list.
 414  * This will be used when the program contains something like this:
 415  *    PARAM ambient = state.material.front.ambient;
 416  *
 417  * \param paramList  the parameter list
 418  * \param stateTokens  an array of 5 (STATE_LENGTH) state tokens
 419  * \return index of the new parameter.
 420  */
 421 GLint
 422 _mesa_add_state_reference(struct gl_program_parameter_list *paramList,
 423                           const gl_state_index stateTokens[STATE_LENGTH])
 424 {
 425    const GLuint size = 4; /* XXX fix */
 426    char *name;
 427    GLint index;
 428
 429    /* Check if the state reference is already in the list */
 430    for (index = 0; index < (GLint) paramList->NumParameters; index++) {
 431       GLuint i, match = 0;
 432       for (i = 0; i < STATE_LENGTH; i++) {
 433          if (paramList->Parameters[index].StateIndexes[i] == stateTokens[i]) {
 434             match++;
 435          }
 436          else {
 437             break;
 438          }
 439       }
 440       if (match == STATE_LENGTH) {
 441          /* this state reference is already in the parameter list */
 442          return index;
 443       }
 444    }
 445
 446    name = _mesa_program_state_string(stateTokens);
 447    index = _mesa_add_parameter(paramList, PROGRAM_STATE_VAR, name,
 448                                size, GL_NONE,
 449                                NULL, (gl_state_index *) stateTokens, 0x0);
 450    paramList->StateFlags |= _mesa_program_state_flags(stateTokens);
 451
 452    /* free name string here since we duplicated it in add_parameter() */
 453    _mesa_free(name);
 454
 455    return index;
 456 }
 457
 458
 459 /**
 460  * Lookup a parameter value by name in the given parameter list.
 461  * \return pointer to the float[4] values.
 462  */
 463 GLfloat *
 464 _mesa_lookup_parameter_value(const struct gl_program_parameter_list *paramList,
 465                              GLsizei nameLen, const char *name)
 466 {
 467    GLuint i = _mesa_lookup_parameter_index(paramList, nameLen, name);
 468    if (i < 0)
 469       return NULL;
 470    else
 471       return paramList->ParameterValues[i];
 472 }
 473
 474
 475 /**
 476  * Given a program parameter name, find its position in the list of parameters.
 477  * \param paramList  the parameter list to search
 478  * \param nameLen  length of name (in chars).
 479  *                 If length is negative, assume that name is null-terminated.
 480  * \param name  the name to search for
 481  * \return index of parameter in the list.
 482  */
 483 GLint
 484 _mesa_lookup_parameter_index(const struct gl_program_parameter_list *paramList,
 485                              GLsizei nameLen, const char *name)
 486 {
 487    GLint i;
 488
 489    if (!paramList)
 490       return -1;
 491
 492    if (nameLen == -1) {
 493       /* name is null-terminated */
 494       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 495          if (paramList->Parameters[i].Name &&
 496              _mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 497             return i;
 498       }
 499    }
 500    else {
 501       /* name is not null-terminated, use nameLen */
 502       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 503          if (paramList->Parameters[i].Name &&
 504              _mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 505              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 506             return i;
 507       }
 508    }
 509    return -1;
 510 }
 511
 512
 513 /**
 514  * Look for a float vector in the given parameter list.  The float vector
 515  * may be of length 1, 2, 3 or 4.  If swizzleOut is non-null, we'll try
 516  * swizzling to find a match.
 517  * \param list  the parameter list to search
 518  * \param v  the float vector to search for
 519  * \param size  number of element in v
 520  * \param posOut  returns the position of the constant, if found
 521  * \param swizzleOut  returns a swizzle mask describing location of the
 522  *                    vector elements if found.
 523  * \return GL_TRUE if found, GL_FALSE if not found
 524  */
 525 GLboolean
 526 _mesa_lookup_parameter_constant(const struct gl_program_parameter_list *list,
 527                                 const GLfloat v[], GLuint vSize,
 528                                 GLint *posOut, GLuint *swizzleOut)
 529 {
 530    GLuint i;
 531
 532    assert(vSize >= 1);
 533    assert(vSize <= 4);
 534
 535    if (!list)
 536       return -1;
 537
 538    for (i = 0; i < list->NumParameters; i++) {
 539       if (list->Parameters[i].Type == PROGRAM_CONSTANT) {
 540          if (!swizzleOut) {
 541             /* swizzle not allowed */
 542             GLuint j, match = 0;
 543             for (j = 0; j < vSize; j++) {
 544                if (v[j] == list->ParameterValues[i][j])
 545                   match++;
 546             }
 547             if (match == vSize) {
 548                *posOut = i;
 549                return GL_TRUE;
 550             }
 551          }
 552          else {
 553             /* try matching w/ swizzle */
 554              if (vSize == 1) {
 555                 /* look for v[0] anywhere within float[4] value */
 556                 GLuint j;
 557                 for (j = 0; j < 4; j++) {
 558                    if (list->ParameterValues[i][j] == v[0]) {
 559                       /* found it */
 560                       *posOut = i;
 561                       *swizzleOut = MAKE_SWIZZLE4(j, j, j, j);
 562                       return GL_TRUE;
 563                    }
 564                 }
 565              }
 566              else if (vSize <= list->Parameters[i].Size) {
 567                 /* see if we can match this constant (with a swizzle) */
 568                 GLuint swz[4];
 569                 GLuint match = 0, j, k;
 570                 for (j = 0; j < vSize; j++) {
 571                    if (v[j] == list->ParameterValues[i][j]) {
 572                       swz[j] = j;
 573                       match++;
 574                    }
 575                    else {
 576                       for (k = 0; k < list->Parameters[i].Size; k++) {
 577                          if (v[j] == list->ParameterValues[i][k]) {
 578                             swz[j] = k;
 579                             match++;
 580                             break;
 581                          }
 582                       }
 583                    }
 584                 }
 585                 /* smear last value to remaining positions */
 586                 for (; j < 4; j++)
 587                    swz[j] = swz[j-1];
 588
 589                 if (match == vSize) {
 590                    *posOut = i;
 591                    *swizzleOut = MAKE_SWIZZLE4(swz[0], swz[1], swz[2], swz[3]);
 592                    return GL_TRUE;
 593                 }
 594              }
 595          }
 596       }
 597    }
 598
 599    *posOut = -1;
 600    return GL_FALSE;
 601 }
 602
 603
 604 struct gl_program_parameter_list *
 605 _mesa_clone_parameter_list(const struct gl_program_parameter_list *list)
 606 {
 607    struct gl_program_parameter_list *clone;
 608    GLuint i;
 609
 610    clone = _mesa_new_parameter_list();
 611    if (!clone)
 612       return NULL;
 613
 614    /** Not too efficient, but correct */
 615    for (i = 0; i < list->NumParameters; i++) {
 616       struct gl_program_parameter *p = list->Parameters + i;
 617       struct gl_program_parameter *pCopy;
 618       GLuint size = MIN2(p->Size, 4);
 619       GLint j = _mesa_add_parameter(clone, p->Type, p->Name, size, p->DataType,
 620                                     list->ParameterValues[i], NULL, 0x0);
 621       ASSERT(j >= 0);
 622       pCopy = clone->Parameters + j;
 623       pCopy->Used = p->Used;
 624       pCopy->Flags = p->Flags;
 625       /* copy state indexes */
 626       if (p->Type == PROGRAM_STATE_VAR) {
 627          GLint k;
 628          for (k = 0; k < STATE_LENGTH; k++) {
 629             pCopy->StateIndexes[k] = p->StateIndexes[k];
 630          }
 631       }
 632       else {
 633          clone->Parameters[j].Size = p->Size;
 634       }
 635
 636    }
 637
 638    clone->StateFlags = list->StateFlags;
 639
 640    return clone;
 641 }
 642
 643
 644 /**
 645  * Return a new parameter list which is listA + listB.
 646  */
 647 struct gl_program_parameter_list *
 648 _mesa_combine_parameter_lists(const struct gl_program_parameter_list *listA,
 649                               const struct gl_program_parameter_list *listB)
 650 {
 651    struct gl_program_parameter_list *list;
 652
 653    if (listA) {
 654       list = _mesa_clone_parameter_list(listA);
 655       if (list && listB) {
 656          GLuint i;
 657          for (i = 0; i < listB->NumParameters; i++) {
 658             struct gl_program_parameter *param = listB->Parameters + i;
 659             _mesa_add_parameter(list, param->Type, param->Name, param->Size,
 660                                 param->DataType,
 661                                 listB->ParameterValues[i],
 662                                 param->StateIndexes,
 663                                 param->Flags);
 664          }
 665       }
 666    }
 667    else if (listB) {
 668       list = _mesa_clone_parameter_list(listB);
 669    }
 670    else {
 671       list = NULL;
 672    }
 673    return list;
 674 }
 675
 676
 677
 678 /**
 679  * Find longest name of all uniform parameters in list.
 680  */
 681 GLuint
 682 _mesa_longest_parameter_name(const struct gl_program_parameter_list *list,
 683                              enum register_file type)
 684 {
 685    GLuint i, maxLen = 0;
 686    if (!list)
 687       return 0;
 688    for (i = 0; i < list->NumParameters; i++) {
 689       if (list->Parameters[i].Type == type) {
 690          GLuint len = _mesa_strlen(list->Parameters[i].Name);
 691          if (len > maxLen)
 692             maxLen = len;
 693       }
 694    }
 695    return maxLen;
 696 }
 697
 698
 699 /**
 700  * Count the number of parameters in the last that match the given type.
 701  */
 702 GLuint
 703 _mesa_num_parameters_of_type(const struct gl_program_parameter_list *list,
 704                              enum register_file type)
 705 {
 706    GLuint i, count = 0;
 707    if (list) {
 708       for (i = 0; i < list->NumParameters; i++) {
 709          if (list->Parameters[i].Type == type)
 710             count++;
 711       }
 712    }
 713    return count;
 714 }