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 || p->Type == PROGRAM_SAMPLER) &&
 294           _mesa_strcmp(p->Name, name) == 0) {
 295          p->Used = GL_TRUE;
 296          /* Note that large uniforms may occupy several slots so we're
 297           * not done searching yet.
 298           */
 299       }
 300    }
 301 }
 302
 303
 304 /**
 305  * Add a sampler to the parameter list.
 306  * \param name  uniform's name
 307  * \param datatype  GL_SAMPLER_2D, GL_SAMPLER_2D_RECT_ARB, etc.
 308  * \param index  the sampler number (as seen in TEX instructions)
 309  * \return  sampler index (starting at zero) or -1 if error
 310  */
 311 GLint
 312 _mesa_add_sampler(struct gl_program_parameter_list *paramList,
 313                   const char *name, GLenum datatype)
 314 {
 315    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 316    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_SAMPLER) {
 317       ASSERT(paramList->Parameters[i].Size == 1);
 318       ASSERT(paramList->Parameters[i].DataType == datatype);
 319       /* already in list */
 320       return (GLint) paramList->ParameterValues[i][0];
 321    }
 322    else {
 323       GLuint i;
 324       const GLint size = 1; /* a sampler is basically a texture unit number */
 325       GLfloat value;
 326       GLint numSamplers = 0;
 327       for (i = 0; i < paramList->NumParameters; i++) {
 328          if (paramList->Parameters[i].Type == PROGRAM_SAMPLER)
 329             numSamplers++;
 330       }
 331       value = (GLfloat) numSamplers;
 332       (void) _mesa_add_parameter(paramList, PROGRAM_SAMPLER, name,
 333                                  size, datatype, &value, NULL, 0x0);
 334       return numSamplers;
 335    }
 336 }
 337
 338
 339 /**
 340  * Add parameter representing a varying variable.
 341  */
 342 GLint
 343 _mesa_add_varying(struct gl_program_parameter_list *paramList,
 344                   const char *name, GLuint size, GLbitfield flags)
 345 {
 346    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 347    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_VARYING) {
 348       /* already in list */
 349       return i;
 350    }
 351    else {
 352       /*assert(size == 4);*/
 353       i = _mesa_add_parameter(paramList, PROGRAM_VARYING, name,
 354                               size, GL_NONE, NULL, NULL, flags);
 355       return i;
 356    }
 357 }
 358
 359
 360 /**
 361  * Add parameter representing a vertex program attribute.
 362  * \param size  size of attribute (in floats), may be -1 if unknown
 363  * \param attrib  the attribute index, or -1 if unknown
 364  */
 365 GLint
 366 _mesa_add_attribute(struct gl_program_parameter_list *paramList,
 367                     const char *name, GLint size, GLenum datatype, GLint attrib)
 368 {
 369    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 370    if (i >= 0) {
 371       /* replace */
 372       if (attrib < 0)
 373          attrib = i;
 374       paramList->Parameters[i].StateIndexes[0] = attrib;
 375    }
 376    else {
 377       /* add */
 378       gl_state_index state[STATE_LENGTH];
 379       state[0] = (gl_state_index) attrib;
 380       if (size < 0)
 381          size = 4;
 382       i = _mesa_add_parameter(paramList, PROGRAM_INPUT, name,
 383                               size, datatype, NULL, state, 0x0);
 384    }
 385    return i;
 386 }
 387
 388
 389
 390 #if 0 /* not used yet */
 391 /**
 392  * Returns the number of 4-component registers needed to store a piece
 393  * of GL state.  For matrices this may be as many as 4 registers,
 394  * everything else needs
 395  * just 1 register.
 396  */
 397 static GLuint
 398 sizeof_state_reference(const GLint *stateTokens)
 399 {
 400    if (stateTokens[0] == STATE_MATRIX) {
 401       GLuint rows = stateTokens[4] - stateTokens[3] + 1;
 402       assert(rows >= 1);
 403       assert(rows <= 4);
 404       return rows;
 405    }
 406    else {
 407       return 1;
 408    }
 409 }
 410 #endif
 411
 412
 413 /**
 414  * Add a new state reference to the parameter list.
 415  * This will be used when the program contains something like this:
 416  *    PARAM ambient = state.material.front.ambient;
 417  *
 418  * \param paramList  the parameter list
 419  * \param stateTokens  an array of 5 (STATE_LENGTH) state tokens
 420  * \return index of the new parameter.
 421  */
 422 GLint
 423 _mesa_add_state_reference(struct gl_program_parameter_list *paramList,
 424                           const gl_state_index stateTokens[STATE_LENGTH])
 425 {
 426    const GLuint size = 4; /* XXX fix */
 427    char *name;
 428    GLint index;
 429
 430    /* Check if the state reference is already in the list */
 431    for (index = 0; index < (GLint) paramList->NumParameters; index++) {
 432       GLuint i, match = 0;
 433       for (i = 0; i < STATE_LENGTH; i++) {
 434          if (paramList->Parameters[index].StateIndexes[i] == stateTokens[i]) {
 435             match++;
 436          }
 437          else {
 438             break;
 439          }
 440       }
 441       if (match == STATE_LENGTH) {
 442          /* this state reference is already in the parameter list */
 443          return index;
 444       }
 445    }
 446
 447    name = _mesa_program_state_string(stateTokens);
 448    index = _mesa_add_parameter(paramList, PROGRAM_STATE_VAR, name,
 449                                size, GL_NONE,
 450                                NULL, (gl_state_index *) stateTokens, 0x0);
 451    paramList->StateFlags |= _mesa_program_state_flags(stateTokens);
 452
 453    /* free name string here since we duplicated it in add_parameter() */
 454    _mesa_free(name);
 455
 456    return index;
 457 }
 458
 459
 460 /**
 461  * Lookup a parameter value by name in the given parameter list.
 462  * \return pointer to the float[4] values.
 463  */
 464 GLfloat *
 465 _mesa_lookup_parameter_value(const struct gl_program_parameter_list *paramList,
 466                              GLsizei nameLen, const char *name)
 467 {
 468    GLuint i = _mesa_lookup_parameter_index(paramList, nameLen, name);
 469    if (i < 0)
 470       return NULL;
 471    else
 472       return paramList->ParameterValues[i];
 473 }
 474
 475
 476 /**
 477  * Given a program parameter name, find its position in the list of parameters.
 478  * \param paramList  the parameter list to search
 479  * \param nameLen  length of name (in chars).
 480  *                 If length is negative, assume that name is null-terminated.
 481  * \param name  the name to search for
 482  * \return index of parameter in the list.
 483  */
 484 GLint
 485 _mesa_lookup_parameter_index(const struct gl_program_parameter_list *paramList,
 486                              GLsizei nameLen, const char *name)
 487 {
 488    GLint i;
 489
 490    if (!paramList)
 491       return -1;
 492
 493    if (nameLen == -1) {
 494       /* name is null-terminated */
 495       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 496          if (paramList->Parameters[i].Name &&
 497              _mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 498             return i;
 499       }
 500    }
 501    else {
 502       /* name is not null-terminated, use nameLen */
 503       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 504          if (paramList->Parameters[i].Name &&
 505              _mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 506              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 507             return i;
 508       }
 509    }
 510    return -1;
 511 }
 512
 513
 514 /**
 515  * Look for a float vector in the given parameter list.  The float vector
 516  * may be of length 1, 2, 3 or 4.  If swizzleOut is non-null, we'll try
 517  * swizzling to find a match.
 518  * \param list  the parameter list to search
 519  * \param v  the float vector to search for
 520  * \param size  number of element in v
 521  * \param posOut  returns the position of the constant, if found
 522  * \param swizzleOut  returns a swizzle mask describing location of the
 523  *                    vector elements if found.
 524  * \return GL_TRUE if found, GL_FALSE if not found
 525  */
 526 GLboolean
 527 _mesa_lookup_parameter_constant(const struct gl_program_parameter_list *list,
 528                                 const GLfloat v[], GLuint vSize,
 529                                 GLint *posOut, GLuint *swizzleOut)
 530 {
 531    GLuint i;
 532
 533    assert(vSize >= 1);
 534    assert(vSize <= 4);
 535
 536    if (!list)
 537       return -1;
 538
 539    for (i = 0; i < list->NumParameters; i++) {
 540       if (list->Parameters[i].Type == PROGRAM_CONSTANT) {
 541          if (!swizzleOut) {
 542             /* swizzle not allowed */
 543             GLuint j, match = 0;
 544             for (j = 0; j < vSize; j++) {
 545                if (v[j] == list->ParameterValues[i][j])
 546                   match++;
 547             }
 548             if (match == vSize) {
 549                *posOut = i;
 550                return GL_TRUE;
 551             }
 552          }
 553          else {
 554             /* try matching w/ swizzle */
 555              if (vSize == 1) {
 556                 /* look for v[0] anywhere within float[4] value */
 557                 GLuint j;
 558                 for (j = 0; j < 4; j++) {
 559                    if (list->ParameterValues[i][j] == v[0]) {
 560                       /* found it */
 561                       *posOut = i;
 562                       *swizzleOut = MAKE_SWIZZLE4(j, j, j, j);
 563                       return GL_TRUE;
 564                    }
 565                 }
 566              }
 567              else if (vSize <= list->Parameters[i].Size) {
 568                 /* see if we can match this constant (with a swizzle) */
 569                 GLuint swz[4];
 570                 GLuint match = 0, j, k;
 571                 for (j = 0; j < vSize; j++) {
 572                    if (v[j] == list->ParameterValues[i][j]) {
 573                       swz[j] = j;
 574                       match++;
 575                    }
 576                    else {
 577                       for (k = 0; k < list->Parameters[i].Size; k++) {
 578                          if (v[j] == list->ParameterValues[i][k]) {
 579                             swz[j] = k;
 580                             match++;
 581                             break;
 582                          }
 583                       }
 584                    }
 585                 }
 586                 /* smear last value to remaining positions */
 587                 for (; j < 4; j++)
 588                    swz[j] = swz[j-1];
 589
 590                 if (match == vSize) {
 591                    *posOut = i;
 592                    *swizzleOut = MAKE_SWIZZLE4(swz[0], swz[1], swz[2], swz[3]);
 593                    return GL_TRUE;
 594                 }
 595              }
 596          }
 597       }
 598    }
 599
 600    *posOut = -1;
 601    return GL_FALSE;
 602 }
 603
 604
 605 struct gl_program_parameter_list *
 606 _mesa_clone_parameter_list(const struct gl_program_parameter_list *list)
 607 {
 608    struct gl_program_parameter_list *clone;
 609    GLuint i;
 610
 611    clone = _mesa_new_parameter_list();
 612    if (!clone)
 613       return NULL;
 614
 615    /** Not too efficient, but correct */
 616    for (i = 0; i < list->NumParameters; i++) {
 617       struct gl_program_parameter *p = list->Parameters + i;
 618       struct gl_program_parameter *pCopy;
 619       GLuint size = MIN2(p->Size, 4);
 620       GLint j = _mesa_add_parameter(clone, p->Type, p->Name, size, p->DataType,
 621                                     list->ParameterValues[i], NULL, 0x0);
 622       ASSERT(j >= 0);
 623       pCopy = clone->Parameters + j;
 624       pCopy->Used = p->Used;
 625       pCopy->Flags = p->Flags;
 626       /* copy state indexes */
 627       if (p->Type == PROGRAM_STATE_VAR) {
 628          GLint k;
 629          for (k = 0; k < STATE_LENGTH; k++) {
 630             pCopy->StateIndexes[k] = p->StateIndexes[k];
 631          }
 632       }
 633       else {
 634          clone->Parameters[j].Size = p->Size;
 635       }
 636
 637    }
 638
 639    clone->StateFlags = list->StateFlags;
 640
 641    return clone;
 642 }
 643
 644
 645 /**
 646  * Return a new parameter list which is listA + listB.
 647  */
 648 struct gl_program_parameter_list *
 649 _mesa_combine_parameter_lists(const struct gl_program_parameter_list *listA,
 650                               const struct gl_program_parameter_list *listB)
 651 {
 652    struct gl_program_parameter_list *list;
 653
 654    if (listA) {
 655       list = _mesa_clone_parameter_list(listA);
 656       if (list && listB) {
 657          GLuint i;
 658          for (i = 0; i < listB->NumParameters; i++) {
 659             struct gl_program_parameter *param = listB->Parameters + i;
 660             _mesa_add_parameter(list, param->Type, param->Name, param->Size,
 661                                 param->DataType,
 662                                 listB->ParameterValues[i],
 663                                 param->StateIndexes,
 664                                 param->Flags);
 665          }
 666       }
 667    }
 668    else if (listB) {
 669       list = _mesa_clone_parameter_list(listB);
 670    }
 671    else {
 672       list = NULL;
 673    }
 674    return list;
 675 }
 676
 677
 678
 679 /**
 680  * Find longest name of all uniform parameters in list.
 681  */
 682 GLuint
 683 _mesa_longest_parameter_name(const struct gl_program_parameter_list *list,
 684                              enum register_file type)
 685 {
 686    GLuint i, maxLen = 0;
 687    if (!list)
 688       return 0;
 689    for (i = 0; i < list->NumParameters; i++) {
 690       if (list->Parameters[i].Type == type) {
 691          GLuint len = _mesa_strlen(list->Parameters[i].Name);
 692          if (len > maxLen)
 693             maxLen = len;
 694       }
 695    }
 696    return maxLen;
 697 }
 698
 699
 700 /**
 701  * Count the number of parameters in the last that match the given type.
 702  */
 703 GLuint
 704 _mesa_num_parameters_of_type(const struct gl_program_parameter_list *list,
 705                              enum register_file type)
 706 {
 707    GLuint i, count = 0;
 708    if (list) {
 709       for (i = 0; i < list->NumParameters; i++) {
 710          if (list->Parameters[i].Type == type)
 711             count++;
 712       }
 713    }
 714    return count;
 715 }