src/mesa/program/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 struct gl_program_parameter_list *
  48 _mesa_new_parameter_list_sized(unsigned size)
  49 {
  50    struct gl_program_parameter_list *p = _mesa_new_parameter_list();
  51
  52    if ((p != NULL) && (size != 0)) {
  53       p->Size = size;
  54
  55       /* alloc arrays */
  56       p->Parameters = (struct gl_program_parameter *)
  57          calloc(1, size * sizeof(struct gl_program_parameter));
  58
  59       p->ParameterValues = (GLfloat (*)[4])
  60          _mesa_align_malloc(size * 4 *sizeof(GLfloat), 16);
  61
  62
  63       if ((p->Parameters == NULL) || (p->ParameterValues == NULL)) {
  64          free(p->Parameters);
  65          _mesa_align_free(p->ParameterValues);
  66          free(p);
  67          p = NULL;
  68       }
  69    }
  70
  71    return p;
  72 }
  73
  74
  75 /**
  76  * Free a parameter list and all its parameters
  77  */
  78 void
  79 _mesa_free_parameter_list(struct gl_program_parameter_list *paramList)
  80 {
  81    GLuint i;
  82    for (i = 0; i < paramList->NumParameters; i++) {
  83       if (paramList->Parameters[i].Name)
  84          free((void *) paramList->Parameters[i].Name);
  85    }
  86    free(paramList->Parameters);
  87    if (paramList->ParameterValues)
  88       _mesa_align_free(paramList->ParameterValues);
  89    free(paramList);
  90 }
  91
  92
  93 /**
  94  * Add a new parameter to a parameter list.
  95  * Note that parameter values are usually 4-element GLfloat vectors.
  96  * When size > 4 we'll allocate a sequential block of parameters to
  97  * store all the values (in blocks of 4).
  98  *
  99  * \param paramList  the list to add the parameter to
 100  * \param type  type of parameter, such as
 101  * \param name  the parameter name, will be duplicated/copied!
 102  * \param size  number of elements in 'values' vector (1..4, or more)
 103  * \param datatype  GL_FLOAT, GL_FLOAT_VECx, GL_INT, GL_INT_VECx or GL_NONE.
 104  * \param values  initial parameter value, up to 4 GLfloats, or NULL
 105  * \param state  state indexes, or NULL
 106  * \return  index of new parameter in the list, or -1 if error (out of mem)
 107  */
 108 GLint
 109 _mesa_add_parameter(struct gl_program_parameter_list *paramList,
 110                     gl_register_file type, const char *name,
 111                     GLuint size, GLenum datatype, const GLfloat *values,
 112                     const gl_state_index state[STATE_LENGTH],
 113                     GLbitfield flags)
 114 {
 115    const GLuint oldNum = paramList->NumParameters;
 116    const GLuint sz4 = (size + 3) / 4; /* no. of new param slots needed */
 117
 118    assert(size > 0);
 119
 120    if (oldNum + sz4 > paramList->Size) {
 121       /* Need to grow the parameter list array (alloc some extra) */
 122       paramList->Size = paramList->Size + 4 * sz4;
 123
 124       /* realloc arrays */
 125       paramList->Parameters = (struct gl_program_parameter *)
 126          _mesa_realloc(paramList->Parameters,
 127                        oldNum * sizeof(struct gl_program_parameter),
 128                        paramList->Size * sizeof(struct gl_program_parameter));
 129
 130       paramList->ParameterValues = (GLfloat (*)[4])
 131          _mesa_align_realloc(paramList->ParameterValues,         /* old buf */
 132                              oldNum * 4 * sizeof(GLfloat),      /* old size */
 133                              paramList->Size * 4 *sizeof(GLfloat), /* new sz */
 134                              16);
 135    }
 136
 137    if (!paramList->Parameters ||
 138        !paramList->ParameterValues) {
 139       /* out of memory */
 140       paramList->NumParameters = 0;
 141       paramList->Size = 0;
 142       return -1;
 143    }
 144    else {
 145       GLuint i;
 146
 147       paramList->NumParameters = oldNum + sz4;
 148
 149       memset(&paramList->Parameters[oldNum], 0,
 150              sz4 * sizeof(struct gl_program_parameter));
 151
 152       for (i = 0; i < sz4; i++) {
 153          struct gl_program_parameter *p = paramList->Parameters + oldNum + i;
 154          p->Name = name ? _mesa_strdup(name) : NULL;
 155          p->Type = type;
 156          p->Size = size;
 157          p->DataType = datatype;
 158          p->Flags = flags;
 159          if (values) {
 160             COPY_4V(paramList->ParameterValues[oldNum + i], values);
 161             values += 4;
 162             p->Initialized = GL_TRUE;
 163          }
 164          else {
 165             /* silence valgrind */
 166             ASSIGN_4V(paramList->ParameterValues[oldNum + i], 0, 0, 0, 0);
 167          }
 168          size -= 4;
 169       }
 170
 171       if (state) {
 172          for (i = 0; i < STATE_LENGTH; i++)
 173             paramList->Parameters[oldNum].StateIndexes[i] = state[i];
 174       }
 175
 176       return (GLint) oldNum;
 177    }
 178 }
 179
 180
 181 /**
 182  * Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
 183  * \return index of the new entry in the parameter list
 184  */
 185 GLint
 186 _mesa_add_named_parameter(struct gl_program_parameter_list *paramList,
 187                           const char *name, const GLfloat values[4])
 188 {
 189    return _mesa_add_parameter(paramList, PROGRAM_NAMED_PARAM, name,
 190                               4, GL_NONE, values, NULL, 0x0);
 191
 192 }
 193
 194
 195 /**
 196  * Add a new named constant to the parameter list.
 197  * This will be used when the program contains something like this:
 198  *    PARAM myVals = { 0, 1, 2, 3 };
 199  *
 200  * \param paramList  the parameter list
 201  * \param name  the name for the constant
 202  * \param values  four float values
 203  * \return index/position of the new parameter in the parameter list
 204  */
 205 GLint
 206 _mesa_add_named_constant(struct gl_program_parameter_list *paramList,
 207                          const char *name, const GLfloat values[4],
 208                          GLuint size)
 209 {
 210    /* first check if this is a duplicate constant */
 211    GLint pos;
 212    for (pos = 0; pos < (GLint)paramList->NumParameters; pos++) {
 213       const GLfloat *pvals = paramList->ParameterValues[pos];
 214       if (pvals[0] == values[0] &&
 215           pvals[1] == values[1] &&
 216           pvals[2] == values[2] &&
 217           pvals[3] == values[3] &&
 218           strcmp(paramList->Parameters[pos].Name, name) == 0) {
 219          /* Same name and value is already in the param list - reuse it */
 220          return pos;
 221       }
 222    }
 223    /* not found, add new parameter */
 224    return _mesa_add_parameter(paramList, PROGRAM_CONSTANT, name,
 225                               size, GL_NONE, values, NULL, 0x0);
 226 }
 227
 228
 229 /**
 230  * Add a new unnamed constant to the parameter list.  This will be used
 231  * when a fragment/vertex program contains something like this:
 232  *    MOV r, { 0, 1, 2, 3 };
 233  * If swizzleOut is non-null we'll search the parameter list for an
 234  * existing instance of the constant which matches with a swizzle.
 235  *
 236  * \param paramList  the parameter list
 237  * \param values  four float values
 238  * \param swizzleOut  returns swizzle mask for accessing the constant
 239  * \return index/position of the new parameter in the parameter list.
 240  */
 241 GLint
 242 _mesa_add_unnamed_constant(struct gl_program_parameter_list *paramList,
 243                            const GLfloat values[4], GLuint size,
 244                            GLuint *swizzleOut)
 245 {
 246    GLint pos;
 247    ASSERT(size >= 1);
 248    ASSERT(size <= 4);
 249
 250    if (swizzleOut &&
 251        _mesa_lookup_parameter_constant(paramList, values,
 252                                        size, &pos, swizzleOut)) {
 253       return pos;
 254    }
 255
 256    /* Look for empty space in an already unnamed constant parameter
 257     * to add this constant.  This will only work for single-element
 258     * constants because we rely on smearing (i.e. .yyyy or .zzzz).
 259     */
 260    if (size == 1 && swizzleOut) {
 261       for (pos = 0; pos < (GLint) paramList->NumParameters; pos++) {
 262          struct gl_program_parameter *p = paramList->Parameters + pos;
 263          if (p->Type == PROGRAM_CONSTANT && p->Size + size <= 4) {
 264             /* ok, found room */
 265             GLfloat *pVal = paramList->ParameterValues[pos];
 266             GLuint swz = p->Size; /* 1, 2 or 3 for Y, Z, W */
 267             pVal[p->Size] = values[0];
 268             p->Size++;
 269             *swizzleOut = MAKE_SWIZZLE4(swz, swz, swz, swz);
 270             return pos;
 271          }
 272       }
 273    }
 274
 275    /* add a new parameter to store this constant */
 276    pos = _mesa_add_parameter(paramList, PROGRAM_CONSTANT, NULL,
 277                              size, GL_NONE, values, NULL, 0x0);
 278    if (pos >= 0 && swizzleOut) {
 279       if (size == 1)
 280          *swizzleOut = SWIZZLE_XXXX;
 281       else
 282          *swizzleOut = SWIZZLE_NOOP;
 283    }
 284    return pos;
 285 }
 286
 287
 288 /**
 289  * Add a uniform to the parameter list.
 290  * Note that if the uniform is an array, size may be greater than
 291  * what's implied by the datatype.
 292  * \param name  uniform's name
 293  * \param size  number of floats to allocate
 294  * \param datatype  GL_FLOAT_VEC3, GL_FLOAT_MAT4, etc.
 295  */
 296 GLint
 297 _mesa_add_uniform(struct gl_program_parameter_list *paramList,
 298                   const char *name, GLuint size, GLenum datatype,
 299                   const GLfloat *values)
 300 {
 301    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 302    ASSERT(datatype != GL_NONE);
 303    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_UNIFORM) {
 304       ASSERT(paramList->Parameters[i].Size == size);
 305       ASSERT(paramList->Parameters[i].DataType == datatype);
 306       /* already in list */
 307       return i;
 308    }
 309    else {
 310       i = _mesa_add_parameter(paramList, PROGRAM_UNIFORM, name,
 311                               size, datatype, values, NULL, 0x0);
 312       return i;
 313    }
 314 }
 315
 316
 317 /**
 318  * Mark the named uniform as 'used'.
 319  */
 320 void
 321 _mesa_use_uniform(struct gl_program_parameter_list *paramList,
 322                   const char *name)
 323 {
 324    GLuint i;
 325    for (i = 0; i < paramList->NumParameters; i++) {
 326       struct gl_program_parameter *p = paramList->Parameters + i;
 327       if ((p->Type == PROGRAM_UNIFORM || p->Type == PROGRAM_SAMPLER) &&
 328           strcmp(p->Name, name) == 0) {
 329          p->Used = GL_TRUE;
 330          /* Note that large uniforms may occupy several slots so we're
 331           * not done searching yet.
 332           */
 333       }
 334    }
 335 }
 336
 337
 338 /**
 339  * Add a sampler to the parameter list.
 340  * \param name  uniform's name
 341  * \param datatype  GL_SAMPLER_2D, GL_SAMPLER_2D_RECT_ARB, etc.
 342  * \param index  the sampler number (as seen in TEX instructions)
 343  * \return  sampler index (starting at zero) or -1 if error
 344  */
 345 GLint
 346 _mesa_add_sampler(struct gl_program_parameter_list *paramList,
 347                   const char *name, GLenum datatype, int array_length)
 348 {
 349    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 350    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_SAMPLER) {
 351       ASSERT(paramList->Parameters[i].Size == 4 * array_length);
 352       ASSERT(paramList->Parameters[i].DataType == datatype);
 353       /* already in list */
 354       return (GLint) paramList->ParameterValues[i][0];
 355    }
 356    else {
 357       GLuint i;
 358        /* One integer texture unit number goes in each parameter location. */
 359       const GLint size = 4 * array_length;
 360       GLfloat value[4];
 361       GLint numSamplers = 0;
 362       for (i = 0; i < paramList->NumParameters; i++) {
 363          if (paramList->Parameters[i].Type == PROGRAM_SAMPLER)
 364             numSamplers++;
 365       }
 366       value[0] = (GLfloat) numSamplers;
 367       value[1] = value[2] = value[3] = 0.0F;
 368       (void) _mesa_add_parameter(paramList, PROGRAM_SAMPLER, name,
 369                                  size, datatype, value, NULL, 0x0);
 370       return numSamplers;
 371    }
 372 }
 373
 374
 375 /**
 376  * Add parameter representing a varying variable.
 377  */
 378 GLint
 379 _mesa_add_varying(struct gl_program_parameter_list *paramList,
 380                   const char *name, GLuint size, GLenum datatype,
 381                   GLbitfield flags)
 382 {
 383    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 384    if (i >= 0 && paramList->Parameters[i].Type == PROGRAM_VARYING) {
 385       /* already in list */
 386       return i;
 387    }
 388    else {
 389       /*assert(size == 4);*/
 390       i = _mesa_add_parameter(paramList, PROGRAM_VARYING, name,
 391                               size, datatype, NULL, NULL, flags);
 392       return i;
 393    }
 394 }
 395
 396
 397 /**
 398  * Add parameter representing a vertex program attribute.
 399  * \param size  size of attribute (in floats), may be -1 if unknown
 400  * \param attrib  the attribute index, or -1 if unknown
 401  */
 402 GLint
 403 _mesa_add_attribute(struct gl_program_parameter_list *paramList,
 404                     const char *name, GLint size, GLenum datatype, GLint attrib)
 405 {
 406    GLint i = _mesa_lookup_parameter_index(paramList, -1, name);
 407    if (i >= 0) {
 408       /* replace */
 409       if (attrib < 0)
 410          attrib = i;
 411       paramList->Parameters[i].StateIndexes[0] = attrib;
 412    }
 413    else {
 414       /* add */
 415       gl_state_index state[STATE_LENGTH];
 416       state[0] = (gl_state_index) attrib;
 417       if (size < 0)
 418          size = 4;
 419       i = _mesa_add_parameter(paramList, PROGRAM_INPUT, name,
 420                               size, datatype, NULL, state, 0x0);
 421    }
 422    return i;
 423 }
 424
 425
 426
 427 #if 0 /* not used yet */
 428 /**
 429  * Returns the number of 4-component registers needed to store a piece
 430  * of GL state.  For matrices this may be as many as 4 registers,
 431  * everything else needs
 432  * just 1 register.
 433  */
 434 static GLuint
 435 sizeof_state_reference(const GLint *stateTokens)
 436 {
 437    if (stateTokens[0] == STATE_MATRIX) {
 438       GLuint rows = stateTokens[4] - stateTokens[3] + 1;
 439       assert(rows >= 1);
 440       assert(rows <= 4);
 441       return rows;
 442    }
 443    else {
 444       return 1;
 445    }
 446 }
 447 #endif
 448
 449
 450 /**
 451  * Add a new state reference to the parameter list.
 452  * This will be used when the program contains something like this:
 453  *    PARAM ambient = state.material.front.ambient;
 454  *
 455  * \param paramList  the parameter list
 456  * \param stateTokens  an array of 5 (STATE_LENGTH) state tokens
 457  * \return index of the new parameter.
 458  */
 459 GLint
 460 _mesa_add_state_reference(struct gl_program_parameter_list *paramList,
 461                           const gl_state_index stateTokens[STATE_LENGTH])
 462 {
 463    const GLuint size = 4; /* XXX fix */
 464    char *name;
 465    GLint index;
 466
 467    /* Check if the state reference is already in the list */
 468    for (index = 0; index < (GLint) paramList->NumParameters; index++) {
 469       GLuint i, match = 0;
 470       for (i = 0; i < STATE_LENGTH; i++) {
 471          if (paramList->Parameters[index].StateIndexes[i] == stateTokens[i]) {
 472             match++;
 473          }
 474          else {
 475             break;
 476          }
 477       }
 478       if (match == STATE_LENGTH) {
 479          /* this state reference is already in the parameter list */
 480          return index;
 481       }
 482    }
 483
 484    name = _mesa_program_state_string(stateTokens);
 485    index = _mesa_add_parameter(paramList, PROGRAM_STATE_VAR, name,
 486                                size, GL_NONE,
 487                                NULL, (gl_state_index *) stateTokens, 0x0);
 488    paramList->StateFlags |= _mesa_program_state_flags(stateTokens);
 489
 490    /* free name string here since we duplicated it in add_parameter() */
 491    free(name);
 492
 493    return index;
 494 }
 495
 496
 497 /**
 498  * Lookup a parameter value by name in the given parameter list.
 499  * \return pointer to the float[4] values.
 500  */
 501 GLfloat *
 502 _mesa_lookup_parameter_value(const struct gl_program_parameter_list *paramList,
 503                              GLsizei nameLen, const char *name)
 504 {
 505    GLint i = _mesa_lookup_parameter_index(paramList, nameLen, name);
 506    if (i < 0)
 507       return NULL;
 508    else
 509       return paramList->ParameterValues[i];
 510 }
 511
 512
 513 /**
 514  * Given a program parameter name, find its position in the list of parameters.
 515  * \param paramList  the parameter list to search
 516  * \param nameLen  length of name (in chars).
 517  *                 If length is negative, assume that name is null-terminated.
 518  * \param name  the name to search for
 519  * \return index of parameter in the list.
 520  */
 521 GLint
 522 _mesa_lookup_parameter_index(const struct gl_program_parameter_list *paramList,
 523                              GLsizei nameLen, const char *name)
 524 {
 525    GLint i;
 526
 527    if (!paramList)
 528       return -1;
 529
 530    if (nameLen == -1) {
 531       /* name is null-terminated */
 532       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 533          if (paramList->Parameters[i].Name &&
 534              strcmp(paramList->Parameters[i].Name, name) == 0)
 535             return i;
 536       }
 537    }
 538    else {
 539       /* name is not null-terminated, use nameLen */
 540       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 541          if (paramList->Parameters[i].Name &&
 542              strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 543              && strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 544             return i;
 545       }
 546    }
 547    return -1;
 548 }
 549
 550
 551 /**
 552  * Look for a float vector in the given parameter list.  The float vector
 553  * may be of length 1, 2, 3 or 4.  If swizzleOut is non-null, we'll try
 554  * swizzling to find a match.
 555  * \param list  the parameter list to search
 556  * \param v  the float vector to search for
 557  * \param vSize  number of element in v
 558  * \param posOut  returns the position of the constant, if found
 559  * \param swizzleOut  returns a swizzle mask describing location of the
 560  *                    vector elements if found.
 561  * \return GL_TRUE if found, GL_FALSE if not found
 562  */
 563 GLboolean
 564 _mesa_lookup_parameter_constant(const struct gl_program_parameter_list *list,
 565                                 const GLfloat v[], GLuint vSize,
 566                                 GLint *posOut, GLuint *swizzleOut)
 567 {
 568    GLuint i;
 569
 570    assert(vSize >= 1);
 571    assert(vSize <= 4);
 572
 573    if (!list)
 574       return -1;
 575
 576    for (i = 0; i < list->NumParameters; i++) {
 577       if (list->Parameters[i].Type == PROGRAM_CONSTANT) {
 578          if (!swizzleOut) {
 579             /* swizzle not allowed */
 580             GLuint j, match = 0;
 581             for (j = 0; j < vSize; j++) {
 582                if (v[j] == list->ParameterValues[i][j])
 583                   match++;
 584             }
 585             if (match == vSize) {
 586                *posOut = i;
 587                return GL_TRUE;
 588             }
 589          }
 590          else {
 591             /* try matching w/ swizzle */
 592              if (vSize == 1) {
 593                 /* look for v[0] anywhere within float[4] value */
 594                 GLuint j;
 595                 for (j = 0; j < list->Parameters[i].Size; j++) {
 596                    if (list->ParameterValues[i][j] == v[0]) {
 597                       /* found it */
 598                       *posOut = i;
 599                       *swizzleOut = MAKE_SWIZZLE4(j, j, j, j);
 600                       return GL_TRUE;
 601                    }
 602                 }
 603              }
 604              else if (vSize <= list->Parameters[i].Size) {
 605                 /* see if we can match this constant (with a swizzle) */
 606                 GLuint swz[4];
 607                 GLuint match = 0, j, k;
 608                 for (j = 0; j < vSize; j++) {
 609                    if (v[j] == list->ParameterValues[i][j]) {
 610                       swz[j] = j;
 611                       match++;
 612                    }
 613                    else {
 614                       for (k = 0; k < list->Parameters[i].Size; k++) {
 615                          if (v[j] == list->ParameterValues[i][k]) {
 616                             swz[j] = k;
 617                             match++;
 618                             break;
 619                          }
 620                       }
 621                    }
 622                 }
 623                 /* smear last value to remaining positions */
 624                 for (; j < 4; j++)
 625                    swz[j] = swz[j-1];
 626
 627                 if (match == vSize) {
 628                    *posOut = i;
 629                    *swizzleOut = MAKE_SWIZZLE4(swz[0], swz[1], swz[2], swz[3]);
 630                    return GL_TRUE;
 631                 }
 632              }
 633          }
 634       }
 635    }
 636
 637    *posOut = -1;
 638    return GL_FALSE;
 639 }
 640
 641
 642 struct gl_program_parameter_list *
 643 _mesa_clone_parameter_list(const struct gl_program_parameter_list *list)
 644 {
 645    struct gl_program_parameter_list *clone;
 646    GLuint i;
 647
 648    clone = _mesa_new_parameter_list();
 649    if (!clone)
 650       return NULL;
 651
 652    /** Not too efficient, but correct */
 653    for (i = 0; i < list->NumParameters; i++) {
 654       struct gl_program_parameter *p = list->Parameters + i;
 655       struct gl_program_parameter *pCopy;
 656       GLuint size = MIN2(p->Size, 4);
 657       GLint j = _mesa_add_parameter(clone, p->Type, p->Name, size, p->DataType,
 658                                     list->ParameterValues[i], NULL, 0x0);
 659       ASSERT(j >= 0);
 660       pCopy = clone->Parameters + j;
 661       pCopy->Used = p->Used;
 662       pCopy->Flags = p->Flags;
 663       /* copy state indexes */
 664       if (p->Type == PROGRAM_STATE_VAR) {
 665          GLint k;
 666          for (k = 0; k < STATE_LENGTH; k++) {
 667             pCopy->StateIndexes[k] = p->StateIndexes[k];
 668          }
 669       }
 670       else {
 671          clone->Parameters[j].Size = p->Size;
 672       }
 673
 674    }
 675
 676    clone->StateFlags = list->StateFlags;
 677
 678    return clone;
 679 }
 680
 681
 682 /**
 683  * Return a new parameter list which is listA + listB.
 684  */
 685 struct gl_program_parameter_list *
 686 _mesa_combine_parameter_lists(const struct gl_program_parameter_list *listA,
 687                               const struct gl_program_parameter_list *listB)
 688 {
 689    struct gl_program_parameter_list *list;
 690
 691    if (listA) {
 692       list = _mesa_clone_parameter_list(listA);
 693       if (list && listB) {
 694          GLuint i;
 695          for (i = 0; i < listB->NumParameters; i++) {
 696             struct gl_program_parameter *param = listB->Parameters + i;
 697             _mesa_add_parameter(list, param->Type, param->Name, param->Size,
 698                                 param->DataType,
 699                                 listB->ParameterValues[i],
 700                                 param->StateIndexes,
 701                                 param->Flags);
 702          }
 703       }
 704    }
 705    else if (listB) {
 706       list = _mesa_clone_parameter_list(listB);
 707    }
 708    else {
 709       list = NULL;
 710    }
 711    return list;
 712 }
 713
 714
 715
 716 /**
 717  * Find longest name of all uniform parameters in list.
 718  */
 719 GLuint
 720 _mesa_longest_parameter_name(const struct gl_program_parameter_list *list,
 721                              gl_register_file type)
 722 {
 723    GLuint i, maxLen = 0;
 724    if (!list)
 725       return 0;
 726    for (i = 0; i < list->NumParameters; i++) {
 727       if (list->Parameters[i].Type == type) {
 728          GLuint len = strlen(list->Parameters[i].Name);
 729          if (len > maxLen)
 730             maxLen = len;
 731       }
 732    }
 733    return maxLen;
 734 }
 735
 736
 737 /**
 738  * Count the number of parameters in the last that match the given type.
 739  */
 740 GLuint
 741 _mesa_num_parameters_of_type(const struct gl_program_parameter_list *list,
 742                              gl_register_file type)
 743 {
 744    GLuint i, count = 0;
 745    if (list) {
 746       for (i = 0; i < list->NumParameters; i++) {
 747          if (list->Parameters[i].Type == type)
 748             count++;
 749       }
 750    }
 751    return count;
 752 }