src/mesa/shader/program.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.2
   4  *
   5  * Copyright (C) 1999-2004  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 program.c
  27  * Vertex and fragment program support functions.
  28  * \author Brian Paul
  29  */
  30
  31
  32 #include "glheader.h"
  33 #include "context.h"
  34 #include "hash.h"
  35 #include "imports.h"
  36 #include "macros.h"
  37 #include "mtypes.h"
  38 #include "program.h"
  39 #include "nvfragparse.h"
  40 #include "nvfragprog.h"
  41 #include "nvvertparse.h"
  42 #include "nvvertprog.h"
  43
  44
  45 /**********************************************************************/
  46 /* Utility functions                                                  */
  47 /**********************************************************************/
  48
  49
  50 /* A pointer to this dummy program is put into the hash table when
  51  * glGenPrograms is called.
  52  */
  53 struct program _mesa_DummyProgram;
  54
  55
  56 /**
  57  * Init context's vertex/fragment program state
  58  */
  59 void
  60 _mesa_init_program(GLcontext *ctx)
  61 {
  62    GLuint i;
  63
  64    ctx->Program.ErrorPos = -1;
  65    ctx->Program.ErrorString = _mesa_strdup("");
  66
  67 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
  68    ctx->VertexProgram.Enabled = GL_FALSE;
  69    ctx->VertexProgram.PointSizeEnabled = GL_FALSE;
  70    ctx->VertexProgram.TwoSideEnabled = GL_FALSE;
  71    ctx->VertexProgram.Current = (struct vertex_program *) ctx->Shared->DefaultVertexProgram;
  72    assert(ctx->VertexProgram.Current);
  73    ctx->VertexProgram.Current->Base.RefCount++;
  74    for (i = 0; i < MAX_NV_VERTEX_PROGRAM_PARAMS / 4; i++) {
  75       ctx->VertexProgram.TrackMatrix[i] = GL_NONE;
  76       ctx->VertexProgram.TrackMatrixTransform[i] = GL_IDENTITY_NV;
  77    }
  78 #endif
  79
  80 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
  81    ctx->FragmentProgram.Enabled = GL_FALSE;
  82    ctx->FragmentProgram.Current = (struct fragment_program *) ctx->Shared->DefaultFragmentProgram;
  83    assert(ctx->FragmentProgram.Current);
  84    ctx->FragmentProgram.Current->Base.RefCount++;
  85 #endif
  86
  87 #if FEATURE_ATI_fragment_shader
  88    ctx->ATIFragmentShader.Enabled = GL_FALSE;
  89    ctx->ATIFragmentShader.Current = (struct ati_fragment_shader *) ctx->Shared->DefaultFragmentShader;
  90    assert(ctx->ATIFragmentShader.Current);
  91    ctx->ATIFragmentShader.Current->Base.RefCount++;
  92 #endif
  93 }
  94
  95
  96 /**
  97  * Free a context's vertex/fragment program state
  98  */
  99 void
 100 _mesa_free_program_data(GLcontext *ctx)
 101 {
 102 #if FEATURE_NV_vertex_program
 103    if (ctx->VertexProgram.Current) {
 104       ctx->VertexProgram.Current->Base.RefCount--;
 105       if (ctx->VertexProgram.Current->Base.RefCount <= 0)
 106          ctx->Driver.DeleteProgram(ctx, &(ctx->VertexProgram.Current->Base));
 107    }
 108 #endif
 109 #if FEATURE_NV_fragment_program
 110    if (ctx->FragmentProgram.Current) {
 111       ctx->FragmentProgram.Current->Base.RefCount--;
 112       if (ctx->FragmentProgram.Current->Base.RefCount <= 0)
 113          ctx->Driver.DeleteProgram(ctx, &(ctx->FragmentProgram.Current->Base));
 114    }
 115 #endif
 116 #if FEATURE_ATI_fragment_shader
 117    if (ctx->ATIFragmentShader.Current) {
 118       ctx->ATIFragmentShader.Current->Base.RefCount--;
 119       if (ctx->ATIFragmentShader.Current->Base.RefCount <= 0)
 120         ctx->Driver.DeleteProgram(ctx, &(ctx->ATIFragmentShader.Current->Base));
 121    }
 122 #endif
 123    _mesa_free((void *) ctx->Program.ErrorString);
 124 }
 125
 126
 127
 128
 129 /**
 130  * Set the vertex/fragment program error state (position and error string).
 131  * This is generally called from within the parsers.
 132  */
 133 void
 134 _mesa_set_program_error(GLcontext *ctx, GLint pos, const char *string)
 135 {
 136    ctx->Program.ErrorPos = pos;
 137    _mesa_free((void *) ctx->Program.ErrorString);
 138    if (!string)
 139       string = "";
 140    ctx->Program.ErrorString = _mesa_strdup(string);
 141 }
 142
 143
 144 /**
 145  * Find the line number and column for 'pos' within 'string'.
 146  * Return a copy of the line which contains 'pos'.  Free the line with
 147  * _mesa_free().
 148  * \param string  the program string
 149  * \param pos     the position within the string
 150  * \param line    returns the line number corresponding to 'pos'.
 151  * \param col     returns the column number corresponding to 'pos'.
 152  * \return copy of the line containing 'pos'.
 153  */
 154 const GLubyte *
 155 _mesa_find_line_column(const GLubyte *string, const GLubyte *pos,
 156                        GLint *line, GLint *col)
 157 {
 158    const GLubyte *lineStart = string;
 159    const GLubyte *p = string;
 160    GLubyte *s;
 161    int len;
 162
 163    *line = 1;
 164
 165    while (p != pos) {
 166       if (*p == (GLubyte) '\n') {
 167          (*line)++;
 168          lineStart = p + 1;
 169       }
 170       p++;
 171    }
 172
 173    *col = (pos - lineStart) + 1;
 174
 175    /* return copy of this line */
 176    while (*p != 0 && *p != '\n')
 177       p++;
 178    len = p - lineStart;
 179    s = (GLubyte *) _mesa_malloc(len + 1);
 180    _mesa_memcpy(s, lineStart, len);
 181    s[len] = 0;
 182
 183    return s;
 184 }
 185
 186
 187 /**
 188  * Initialize a new vertex/fragment program object.
 189  */
 190 static struct program *
 191 _mesa_init_program_struct( GLcontext *ctx, struct program *prog,
 192                            GLenum target, GLuint id)
 193 {
 194    (void) ctx;
 195    if (prog) {
 196       prog->Id = id;
 197       prog->Target = target;
 198       prog->Resident = GL_TRUE;
 199       prog->RefCount = 1;
 200    }
 201
 202    return prog;
 203 }
 204
 205
 206 /**
 207  * Initialize a new fragment program object.
 208  */
 209 struct program *
 210 _mesa_init_fragment_program( GLcontext *ctx, struct fragment_program *prog,
 211                              GLenum target, GLuint id)
 212 {
 213    if (prog)
 214       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 215    else
 216       return NULL;
 217 }
 218
 219
 220 /**
 221  * Initialize a new vertex program object.
 222  */
 223 struct program *
 224 _mesa_init_vertex_program( GLcontext *ctx, struct vertex_program *prog,
 225                            GLenum target, GLuint id)
 226 {
 227    if (prog)
 228       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 229    else
 230       return NULL;
 231 }
 232
 233 /**
 234  * Initialize a new ATI fragment shader object.
 235  */
 236 struct program *
 237 _mesa_init_ati_fragment_shader( GLcontext *ctx,
 238                                 struct ati_fragment_shader *prog,
 239                                 GLenum target, GLuint id )
 240 {
 241    if (prog)
 242       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 243    else
 244       return NULL;
 245 }
 246
 247
 248
 249 /**
 250  * Allocate and initialize a new fragment/vertex program object but
 251  * don't put it into the program hash table.  Called via
 252  * ctx->Driver.NewProgram.  May be overridden (ie. replaced) by a
 253  * device driver function to implement OO deriviation with additional
 254  * types not understood by this function.
 255  *
 256  * \param ctx  context
 257  * \param id   program id/number
 258  * \param target  program target/type
 259  * \return  pointer to new program object
 260  */
 261 struct program *
 262 _mesa_new_program(GLcontext *ctx, GLenum target, GLuint id)
 263 {
 264    switch (target) {
 265    case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
 266       return _mesa_init_vertex_program( ctx, CALLOC_STRUCT(vertex_program),
 267                                         target, id );
 268    case GL_FRAGMENT_PROGRAM_NV:
 269    case GL_FRAGMENT_PROGRAM_ARB:
 270       return _mesa_init_fragment_program( ctx, CALLOC_STRUCT(fragment_program),
 271                                           target, id );
 272    case GL_FRAGMENT_SHADER_ATI:
 273       return _mesa_init_ati_fragment_shader( ctx, CALLOC_STRUCT(ati_fragment_shader),
 274                                           target, id );
 275
 276    default:
 277       _mesa_problem(ctx, "bad target in _mesa_new_program");
 278       return NULL;
 279    }
 280 }
 281
 282
 283 /**
 284  * Delete a program and remove it from the hash table, ignoring the
 285  * reference count.
 286  * Called via ctx->Driver.DeleteProgram.  May be wrapped (OO deriviation)
 287  * by a device driver function.
 288  */
 289 void
 290 _mesa_delete_program(GLcontext *ctx, struct program *prog)
 291 {
 292    (void) ctx;
 293    ASSERT(prog);
 294
 295    if (prog->String)
 296       _mesa_free(prog->String);
 297    if (prog->Target == GL_VERTEX_PROGRAM_NV ||
 298        prog->Target == GL_VERTEX_STATE_PROGRAM_NV) {
 299       struct vertex_program *vprog = (struct vertex_program *) prog;
 300       if (vprog->Instructions) {
 301          GLuint i;
 302          for (i = 0; i < vprog->Base.NumInstructions; i++) {
 303             if (vprog->Instructions[i].Data)
 304                _mesa_free(vprog->Instructions[i].Data);
 305          }
 306          _mesa_free(vprog->Instructions);
 307       }
 308       if (vprog->Parameters)
 309          _mesa_free_parameter_list(vprog->Parameters);
 310    }
 311    else if (prog->Target == GL_FRAGMENT_PROGRAM_NV ||
 312             prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
 313       struct fragment_program *fprog = (struct fragment_program *) prog;
 314       if (fprog->Instructions) {
 315          GLuint i;
 316          for (i = 0; i < fprog->Base.NumInstructions; i++) {
 317             if (fprog->Instructions[i].Data)
 318                _mesa_free(fprog->Instructions[i].Data);
 319          }
 320          _mesa_free(fprog->Instructions);
 321       }
 322       if (fprog->Parameters)
 323          _mesa_free_parameter_list(fprog->Parameters);
 324    }
 325    else if (prog->Target == GL_FRAGMENT_SHADER_ATI) {
 326       struct ati_fragment_shader *atifs = (struct ati_fragment_shader *)prog;
 327       if (atifs->Instructions)
 328          _mesa_free(atifs->Instructions);
 329    }
 330
 331    _mesa_free(prog);
 332 }
 333
 334
 335
 336 /**********************************************************************/
 337 /* Program parameter functions                                        */
 338 /**********************************************************************/
 339
 340 struct program_parameter_list *
 341 _mesa_new_parameter_list(void)
 342 {
 343    return (struct program_parameter_list *)
 344       _mesa_calloc(sizeof(struct program_parameter_list));
 345 }
 346
 347
 348 /**
 349  * Free a parameter list and all its parameters
 350  */
 351 void
 352 _mesa_free_parameter_list(struct program_parameter_list *paramList)
 353 {
 354    _mesa_free_parameters(paramList);
 355    _mesa_free(paramList->Parameters);
 356    if (paramList->ParameterValues)
 357       ALIGN_FREE(paramList->ParameterValues);
 358    _mesa_free(paramList);
 359 }
 360
 361
 362 /**
 363  * Free all the parameters in the given list, but don't free the
 364  * paramList structure itself.
 365  */
 366 void
 367 _mesa_free_parameters(struct program_parameter_list *paramList)
 368 {
 369    GLuint i;
 370    for (i = 0; i < paramList->NumParameters; i++) {
 371       if (paramList->Parameters[i].Name)
 372          _mesa_free((void *) paramList->Parameters[i].Name);
 373    }
 374    paramList->NumParameters = 0;
 375 }
 376
 377
 378 /**
 379  * Helper function used by the functions below.
 380  */
 381 static GLint
 382 add_parameter(struct program_parameter_list *paramList,
 383               const char *name, const GLfloat values[4],
 384               enum parameter_type type)
 385 {
 386    const GLuint n = paramList->NumParameters;
 387
 388    if (n == paramList->Size) {
 389       GLfloat (*tmp)[4];
 390
 391       paramList->Size *= 2;
 392       if (!paramList->Size)
 393          paramList->Size = 8;
 394
 395       paramList->Parameters = (struct program_parameter *)
 396          _mesa_realloc(paramList->Parameters,
 397                        n * sizeof(struct program_parameter),
 398                        paramList->Size * sizeof(struct program_parameter));
 399
 400       tmp = paramList->ParameterValues;
 401       paramList->ParameterValues = ALIGN_MALLOC(paramList->Size * 4 * sizeof(GLfloat), 16);
 402       if (tmp) {
 403          _mesa_memcpy(paramList->ParameterValues, tmp,
 404                       n * 4 * sizeof(GLfloat));
 405          ALIGN_FREE(tmp);
 406       }
 407    }
 408
 409    if (!paramList->Parameters ||
 410        !paramList->ParameterValues) {
 411       /* out of memory */
 412       paramList->NumParameters = 0;
 413       paramList->Size = 0;
 414       return -1;
 415    }
 416    else {
 417       paramList->NumParameters = n + 1;
 418
 419       _mesa_memset(&paramList->Parameters[n], 0,
 420                    sizeof(struct program_parameter));
 421
 422       paramList->Parameters[n].Name = name ? _mesa_strdup(name) : NULL;
 423       paramList->Parameters[n].Type = type;
 424       if (values)
 425          COPY_4V(paramList->ParameterValues[n], values);
 426       return (GLint) n;
 427    }
 428 }
 429
 430
 431 /**
 432  * Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
 433  * \return index of the new entry in the parameter list
 434  */
 435 GLint
 436 _mesa_add_named_parameter(struct program_parameter_list *paramList,
 437                           const char *name, const GLfloat values[4])
 438 {
 439    return add_parameter(paramList, name, values, NAMED_PARAMETER);
 440 }
 441
 442
 443 /**
 444  * Add a new unnamed constant to the parameter list.
 445  * \param paramList - the parameter list
 446  * \param values - four float values
 447  * \return index of the new parameter.
 448  */
 449 GLint
 450 _mesa_add_named_constant(struct program_parameter_list *paramList,
 451                          const char *name, const GLfloat values[4])
 452 {
 453    return add_parameter(paramList, name, values, CONSTANT);
 454 }
 455
 456
 457 /**
 458  * Add a new unnamed constant to the parameter list.
 459  * \param paramList - the parameter list
 460  * \param values - four float values
 461  * \return index of the new parameter.
 462  */
 463 GLint
 464 _mesa_add_unnamed_constant(struct program_parameter_list *paramList,
 465                            const GLfloat values[4])
 466 {
 467    return add_parameter(paramList, NULL, values, CONSTANT);
 468 }
 469
 470
 471 /**
 472  * Add a new state reference to the parameter list.
 473  * \param paramList - the parameter list
 474  * \param state     - an array of 6 state tokens
 475  *
 476  * \return index of the new parameter.
 477  */
 478 GLint
 479 _mesa_add_state_reference(struct program_parameter_list *paramList,
 480                           GLint *stateTokens)
 481 {
 482    /* XXX Should we parse <stateString> here and produce the parameter's
 483     * list of STATE_* tokens here, or in the parser?
 484     */
 485    GLint a, idx;
 486
 487    idx = add_parameter(paramList, NULL, NULL, STATE);
 488
 489    for (a=0; a<6; a++)
 490       paramList->Parameters[idx].StateIndexes[a] = (enum state_index) stateTokens[a];
 491
 492    return idx;
 493 }
 494
 495
 496 /**
 497  * Lookup a parameter value by name in the given parameter list.
 498  * \return pointer to the float[4] values.
 499  */
 500 GLfloat *
 501 _mesa_lookup_parameter_value(struct program_parameter_list *paramList,
 502                              GLsizei nameLen, const char *name)
 503 {
 504    GLuint i;
 505
 506    if (!paramList)
 507       return NULL;
 508
 509    if (nameLen == -1) {
 510       /* name is null-terminated */
 511       for (i = 0; i < paramList->NumParameters; i++) {
 512          if (paramList->Parameters[i].Name &&
 513              _mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 514             return paramList->ParameterValues[i];
 515       }
 516    }
 517    else {
 518       /* name is not null-terminated, use nameLen */
 519       for (i = 0; i < paramList->NumParameters; i++) {
 520          if (paramList->Parameters[i].Name &&
 521              _mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 522              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 523             return paramList->ParameterValues[i];
 524       }
 525    }
 526    return NULL;
 527 }
 528
 529
 530 /**
 531  * Lookup a parameter index by name in the given parameter list.
 532  * \return index of parameter in the list.
 533  */
 534 GLint
 535 _mesa_lookup_parameter_index(struct program_parameter_list *paramList,
 536                              GLsizei nameLen, const char *name)
 537 {
 538    GLint i;
 539
 540    if (!paramList)
 541       return -1;
 542
 543    if (nameLen == -1) {
 544       /* name is null-terminated */
 545       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 546          if (paramList->Parameters[i].Name &&
 547              _mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 548             return i;
 549       }
 550    }
 551    else {
 552       /* name is not null-terminated, use nameLen */
 553       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 554          if (paramList->Parameters[i].Name &&
 555              _mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 556              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 557             return i;
 558       }
 559    }
 560    return -1;
 561 }
 562
 563
 564 /**
 565  * Use the list of tokens in the state[] array to find global GL state
 566  * and return it in <value>.  Usually, four values are returned in <value>
 567  * but matrix queries may return as many as 16 values.
 568  * This function is used for ARB vertex/fragment programs.
 569  * The program parser will produce the state[] values.
 570  */
 571 static void
 572 _mesa_fetch_state(GLcontext *ctx, const enum state_index state[],
 573                   GLfloat *value)
 574 {
 575    switch (state[0]) {
 576    case STATE_MATERIAL:
 577       {
 578          /* state[1] is either 0=front or 1=back side */
 579          const GLuint face = (GLuint) state[1];
 580          /* state[2] is the material attribute */
 581          switch (state[2]) {
 582          case STATE_AMBIENT:
 583             if (face == 0)
 584                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT]);
 585             else
 586                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT]);
 587             return;
 588          case STATE_DIFFUSE:
 589             if (face == 0)
 590                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE]);
 591             else
 592                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE]);
 593             return;
 594          case STATE_SPECULAR:
 595             if (face == 0)
 596                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR]);
 597             else
 598                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SPECULAR]);
 599             return;
 600          case STATE_EMISSION:
 601             if (face == 0)
 602                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION]);
 603             else
 604                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION]);
 605             return;
 606          case STATE_SHININESS:
 607             if (face == 0)
 608                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SHININESS][0];
 609             else
 610                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SHININESS][0];
 611             value[1] = 0.0F;
 612             value[2] = 0.0F;
 613             value[3] = 1.0F;
 614             return;
 615          default:
 616             _mesa_problem(ctx, "Invalid material state in fetch_state");
 617             return;
 618          }
 619       }
 620    case STATE_LIGHT:
 621       {
 622          /* state[1] is the light number */
 623          const GLuint ln = (GLuint) state[1];
 624          /* state[2] is the light attribute */
 625          switch (state[2]) {
 626          case STATE_AMBIENT:
 627             COPY_4V(value, ctx->Light.Light[ln].Ambient);
 628             return;
 629          case STATE_DIFFUSE:
 630             COPY_4V(value, ctx->Light.Light[ln].Diffuse);
 631             return;
 632          case STATE_SPECULAR:
 633             COPY_4V(value, ctx->Light.Light[ln].Specular);
 634             return;
 635          case STATE_POSITION:
 636             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 637             return;
 638          case STATE_ATTENUATION:
 639             value[0] = ctx->Light.Light[ln].ConstantAttenuation;
 640             value[1] = ctx->Light.Light[ln].LinearAttenuation;
 641             value[2] = ctx->Light.Light[ln].QuadraticAttenuation;
 642             value[3] = ctx->Light.Light[ln].SpotExponent;
 643             return;
 644          case STATE_SPOT_DIRECTION:
 645             COPY_3V(value, ctx->Light.Light[ln].EyeDirection);
 646             value[3] = ctx->Light.Light[ln]._CosCutoff;
 647             return;
 648          case STATE_HALF:
 649             {
 650                GLfloat eye_z[] = {0, 0, 1};
 651
 652                /* Compute infinite half angle vector:
 653                 *   half-vector = light_position + (0, 0, 1)
 654                 * and then normalize.  w = 0
 655                 *
 656                 * light.EyePosition.w should be 0 for infinite lights.
 657                 */
 658                ADD_3V(value, eye_z, ctx->Light.Light[ln].EyePosition);
 659                NORMALIZE_3FV(value);
 660                value[3] = 0;
 661             }
 662             return;
 663          case STATE_POSITION_NORMALIZED:
 664             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 665             NORMALIZE_3FV( value );
 666             return;
 667          default:
 668             _mesa_problem(ctx, "Invalid light state in fetch_state");
 669             return;
 670          }
 671       }
 672    case STATE_LIGHTMODEL_AMBIENT:
 673       COPY_4V(value, ctx->Light.Model.Ambient);
 674       return;
 675    case STATE_LIGHTMODEL_SCENECOLOR:
 676       if (state[1] == 0) {
 677          /* front */
 678          GLint i;
 679          for (i = 0; i < 3; i++) {
 680             value[i] = ctx->Light.Model.Ambient[i]
 681                * ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT][i]
 682                + ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION][i];
 683          }
 684          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
 685       }
 686       else {
 687          /* back */
 688          GLint i;
 689          for (i = 0; i < 3; i++) {
 690             value[i] = ctx->Light.Model.Ambient[i]
 691                * ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT][i]
 692                + ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION][i];
 693          }
 694          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
 695       }
 696       return;
 697    case STATE_LIGHTPROD:
 698       {
 699          const GLuint ln = (GLuint) state[1];
 700          const GLuint face = (GLuint) state[2];
 701          GLint i;
 702          ASSERT(face == 0 || face == 1);
 703          switch (state[3]) {
 704             case STATE_AMBIENT:
 705                for (i = 0; i < 3; i++) {
 706                   value[i] = ctx->Light.Light[ln].Ambient[i] *
 707                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][i];
 708                }
 709                /* [3] = material alpha */
 710                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 711                return;
 712             case STATE_DIFFUSE:
 713                for (i = 0; i < 3; i++) {
 714                   value[i] = ctx->Light.Light[ln].Diffuse[i] *
 715                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][i];
 716                }
 717                /* [3] = material alpha */
 718                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 719                return;
 720             case STATE_SPECULAR:
 721                for (i = 0; i < 3; i++) {
 722                   value[i] = ctx->Light.Light[ln].Specular[i] *
 723                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][i];
 724                }
 725                /* [3] = material alpha */
 726                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 727                return;
 728             default:
 729                _mesa_problem(ctx, "Invalid lightprod state in fetch_state");
 730                return;
 731          }
 732       }
 733    case STATE_TEXGEN:
 734       {
 735          /* state[1] is the texture unit */
 736          const GLuint unit = (GLuint) state[1];
 737          /* state[2] is the texgen attribute */
 738          switch (state[2]) {
 739          case STATE_TEXGEN_EYE_S:
 740             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneS);
 741             return;
 742          case STATE_TEXGEN_EYE_T:
 743             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneT);
 744             return;
 745          case STATE_TEXGEN_EYE_R:
 746             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneR);
 747             return;
 748          case STATE_TEXGEN_EYE_Q:
 749             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneQ);
 750             return;
 751          case STATE_TEXGEN_OBJECT_S:
 752             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneS);
 753             return;
 754          case STATE_TEXGEN_OBJECT_T:
 755             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneT);
 756             return;
 757          case STATE_TEXGEN_OBJECT_R:
 758             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneR);
 759             return;
 760          case STATE_TEXGEN_OBJECT_Q:
 761             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneQ);
 762             return;
 763          default:
 764             _mesa_problem(ctx, "Invalid texgen state in fetch_state");
 765             return;
 766          }
 767       }
 768    case STATE_TEXENV_COLOR:
 769       {
 770          /* state[1] is the texture unit */
 771          const GLuint unit = (GLuint) state[1];
 772          COPY_4V(value, ctx->Texture.Unit[unit].EnvColor);
 773       }
 774       return;
 775    case STATE_FOG_COLOR:
 776       COPY_4V(value, ctx->Fog.Color);
 777       return;
 778    case STATE_FOG_PARAMS:
 779       value[0] = ctx->Fog.Density;
 780       value[1] = ctx->Fog.Start;
 781       value[2] = ctx->Fog.End;
 782       value[3] = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
 783       return;
 784    case STATE_CLIPPLANE:
 785       {
 786          const GLuint plane = (GLuint) state[1];
 787          COPY_4V(value, ctx->Transform.EyeUserPlane[plane]);
 788       }
 789       return;
 790    case STATE_POINT_SIZE:
 791       value[0] = ctx->Point.Size;
 792       value[1] = ctx->Point.MinSize;
 793       value[2] = ctx->Point.MaxSize;
 794       value[3] = ctx->Point.Threshold;
 795       return;
 796    case STATE_POINT_ATTENUATION:
 797       value[0] = ctx->Point.Params[0];
 798       value[1] = ctx->Point.Params[1];
 799       value[2] = ctx->Point.Params[2];
 800       value[3] = 1.0F;
 801       return;
 802    case STATE_MATRIX:
 803       {
 804          /* state[1] = modelview, projection, texture, etc. */
 805          /* state[2] = which texture matrix or program matrix */
 806          /* state[3] = first column to fetch */
 807          /* state[4] = last column to fetch */
 808          /* state[5] = transpose, inverse or invtrans */
 809
 810          const GLmatrix *matrix;
 811          const enum state_index mat = state[1];
 812          const GLuint index = (GLuint) state[2];
 813          const GLuint first = (GLuint) state[3];
 814          const GLuint last = (GLuint) state[4];
 815          const enum state_index modifier = state[5];
 816          const GLfloat *m;
 817          GLuint row, i;
 818          if (mat == STATE_MODELVIEW) {
 819             matrix = ctx->ModelviewMatrixStack.Top;
 820          }
 821          else if (mat == STATE_PROJECTION) {
 822             matrix = ctx->ProjectionMatrixStack.Top;
 823          }
 824          else if (mat == STATE_MVP) {
 825             matrix = &ctx->_ModelProjectMatrix;
 826          }
 827          else if (mat == STATE_TEXTURE) {
 828             matrix = ctx->TextureMatrixStack[index].Top;
 829          }
 830          else if (mat == STATE_PROGRAM) {
 831             matrix = ctx->ProgramMatrixStack[index].Top;
 832          }
 833          else {
 834             _mesa_problem(ctx, "Bad matrix name in _mesa_fetch_state()");
 835             return;
 836          }
 837          if (modifier == STATE_MATRIX_INVERSE ||
 838              modifier == STATE_MATRIX_INVTRANS) {
 839             /* Be sure inverse is up to date:
 840              */
 841             _math_matrix_analyse( (GLmatrix*) matrix );
 842             m = matrix->inv;
 843          }
 844          else {
 845             m = matrix->m;
 846          }
 847          if (modifier == STATE_MATRIX_TRANSPOSE ||
 848              modifier == STATE_MATRIX_INVTRANS) {
 849             for (i = 0, row = first; row <= last; row++) {
 850                value[i++] = m[row * 4 + 0];
 851                value[i++] = m[row * 4 + 1];
 852                value[i++] = m[row * 4 + 2];
 853                value[i++] = m[row * 4 + 3];
 854             }
 855          }
 856          else {
 857             for (i = 0, row = first; row <= last; row++) {
 858                value[i++] = m[row + 0];
 859                value[i++] = m[row + 4];
 860                value[i++] = m[row + 8];
 861                value[i++] = m[row + 12];
 862             }
 863          }
 864       }
 865       return;
 866    case STATE_DEPTH_RANGE:
 867       value[0] = ctx->Viewport.Near;                     /* near       */
 868       value[1] = ctx->Viewport.Far;                      /* far        */
 869       value[2] = ctx->Viewport.Far - ctx->Viewport.Near; /* far - near */
 870       value[3] = 0;
 871       return;
 872    case STATE_FRAGMENT_PROGRAM:
 873       {
 874          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 875          /* state[2] = parameter index          */
 876          const int idx = (int) state[2];
 877          switch (state[1]) {
 878             case STATE_ENV:
 879                COPY_4V(value, ctx->FragmentProgram.Parameters[idx]);
 880                break;
 881             case STATE_LOCAL:
 882                COPY_4V(value, ctx->FragmentProgram.Current->Base.LocalParams[idx]);
 883                break;
 884             default:
 885                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 886                return;
 887          }
 888       }
 889       return;
 890
 891    case STATE_VERTEX_PROGRAM:
 892       {
 893          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 894          /* state[2] = parameter index          */
 895          const int idx = (int) state[2];
 896          switch (state[1]) {
 897             case STATE_ENV:
 898                COPY_4V(value, ctx->VertexProgram.Parameters[idx]);
 899                break;
 900             case STATE_LOCAL:
 901                COPY_4V(value, ctx->VertexProgram.Current->Base.LocalParams[idx]);
 902                break;
 903             default:
 904                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 905                return;
 906          }
 907       }
 908       return;
 909
 910    case STATE_INTERNAL:
 911       {
 912          switch (state[1]) {
 913             case STATE_NORMAL_SCALE:
 914                ASSIGN_4V(value, ctx->_ModelViewInvScale, 0, 0, 1);
 915                break;
 916             default:
 917                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 918                return;
 919          }
 920       }
 921       return;
 922
 923    default:
 924       _mesa_problem(ctx, "Invalid state in _mesa_fetch_state");
 925       return;
 926    }
 927 }
 928
 929
 930 /**
 931  * Loop over all the parameters in a parameter list.  If the parameter
 932  * is a GL state reference, look up the current value of that state
 933  * variable and put it into the parameter's Value[4] array.
 934  * This would be called at glBegin time when using a fragment program.
 935  */
 936 void
 937 _mesa_load_state_parameters(GLcontext *ctx,
 938                             struct program_parameter_list *paramList)
 939 {
 940    GLuint i;
 941
 942    if (!paramList)
 943       return;
 944
 945    for (i = 0; i < paramList->NumParameters; i++) {
 946       if (paramList->Parameters[i].Type == STATE) {
 947          _mesa_fetch_state(ctx,
 948                            paramList->Parameters[i].StateIndexes,
 949                            paramList->ParameterValues[i]);
 950       }
 951    }
 952 }
 953
 954
 955
 956 /**********************************************************************/
 957 /* API functions                                                      */
 958 /**********************************************************************/
 959
 960
 961 /**
 962  * Bind a program (make it current)
 963  * \note Called from the GL API dispatcher by both glBindProgramNV
 964  * and glBindProgramARB.
 965  */
 966 void GLAPIENTRY
 967 _mesa_BindProgram(GLenum target, GLuint id)
 968 {
 969    struct program *prog;
 970    GET_CURRENT_CONTEXT(ctx);
 971    ASSERT_OUTSIDE_BEGIN_END(ctx);
 972
 973    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 974
 975    if ((target == GL_VERTEX_PROGRAM_NV
 976         && ctx->Extensions.NV_vertex_program) ||
 977        (target == GL_VERTEX_PROGRAM_ARB
 978         && ctx->Extensions.ARB_vertex_program)) {
 979       /*** Vertex program binding ***/
 980       struct vertex_program *curProg = ctx->VertexProgram.Current;
 981       if (curProg->Base.Id == id) {
 982          /* binding same program - no change */
 983          return;
 984       }
 985       if (curProg->Base.Id != 0) {
 986          /* decrement refcount on previously bound vertex program */
 987          curProg->Base.RefCount--;
 988          /* and delete if refcount goes below one */
 989          if (curProg->Base.RefCount <= 0) {
 990             /* the program ID was already removed from the hash table */
 991             ctx->Driver.DeleteProgram(ctx, &(curProg->Base));
 992          }
 993       }
 994    }
 995    else if ((target == GL_FRAGMENT_PROGRAM_NV
 996              && ctx->Extensions.NV_fragment_program) ||
 997             (target == GL_FRAGMENT_PROGRAM_ARB
 998              && ctx->Extensions.ARB_fragment_program)) {
 999       /*** Fragment program binding ***/
1000       struct fragment_program *curProg = ctx->FragmentProgram.Current;
1001       if (curProg->Base.Id == id) {
1002          /* binding same program - no change */
1003          return;
1004       }
1005       if (curProg->Base.Id != 0) {
1006          /* decrement refcount on previously bound fragment program */
1007          curProg->Base.RefCount--;
1008          /* and delete if refcount goes below one */
1009          if (curProg->Base.RefCount <= 0) {
1010             /* the program ID was already removed from the hash table */
1011             ctx->Driver.DeleteProgram(ctx, &(curProg->Base));
1012          }
1013       }
1014    }
1015    else {
1016       _mesa_error(ctx, GL_INVALID_ENUM, "glBindProgramNV/ARB(target)");
1017       return;
1018    }
1019
1020    /* NOTE: binding to a non-existant program is not an error.
1021     * That's supposed to be caught in glBegin.
1022     */
1023    if (id == 0) {
1024       /* Bind default program */
1025       prog = NULL;
1026       if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB)
1027          prog = ctx->Shared->DefaultVertexProgram;
1028       else
1029          prog = ctx->Shared->DefaultFragmentProgram;
1030    }
1031    else {
1032       /* Bind user program */
1033       prog = (struct program *) _mesa_HashLookup(ctx->Shared->Programs, id);
1034       if (!prog || prog == &_mesa_DummyProgram) {
1035          /* allocate a new program now */
1036          prog = ctx->Driver.NewProgram(ctx, target, id);
1037          if (!prog) {
1038             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindProgramNV/ARB");
1039             return;
1040          }
1041          _mesa_HashInsert(ctx->Shared->Programs, id, prog);
1042       }
1043       else if (prog->Target != target) {
1044          _mesa_error(ctx, GL_INVALID_OPERATION,
1045                      "glBindProgramNV/ARB(target mismatch)");
1046          return;
1047       }
1048    }
1049
1050    /* bind now */
1051    if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB) {
1052       ctx->VertexProgram.Current = (struct vertex_program *) prog;
1053    }
1054    else if (target == GL_FRAGMENT_PROGRAM_NV || target == GL_FRAGMENT_PROGRAM_ARB) {
1055       ctx->FragmentProgram.Current = (struct fragment_program *) prog;
1056    }
1057
1058    /* Never null pointers */
1059    ASSERT(ctx->VertexProgram.Current);
1060    ASSERT(ctx->FragmentProgram.Current);
1061
1062    if (prog)
1063       prog->RefCount++;
1064
1065    if (ctx->Driver.BindProgram)
1066       ctx->Driver.BindProgram(ctx, target, prog);
1067 }
1068
1069
1070 /**
1071  * Delete a list of programs.
1072  * \note Not compiled into display lists.
1073  * \note Called by both glDeleteProgramsNV and glDeleteProgramsARB.
1074  */
1075 void GLAPIENTRY
1076 _mesa_DeletePrograms(GLsizei n, const GLuint *ids)
1077 {
1078    GLint i;
1079    GET_CURRENT_CONTEXT(ctx);
1080    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1081
1082    if (n < 0) {
1083       _mesa_error( ctx, GL_INVALID_VALUE, "glDeleteProgramsNV" );
1084       return;
1085    }
1086
1087    for (i = 0; i < n; i++) {
1088       if (ids[i] != 0) {
1089          struct program *prog = (struct program *)
1090             _mesa_HashLookup(ctx->Shared->Programs, ids[i]);
1091          if (prog == &_mesa_DummyProgram) {
1092             _mesa_HashRemove(ctx->Shared->Programs, ids[i]);
1093          }
1094          else if (prog) {
1095             /* Unbind program if necessary */
1096             if (prog->Target == GL_VERTEX_PROGRAM_NV ||
1097                 prog->Target == GL_VERTEX_STATE_PROGRAM_NV) {
1098                if (ctx->VertexProgram.Current &&
1099                    ctx->VertexProgram.Current->Base.Id == ids[i]) {
1100                   /* unbind this currently bound program */
1101                   _mesa_BindProgram(prog->Target, 0);
1102                }
1103             }
1104             else if (prog->Target == GL_FRAGMENT_PROGRAM_NV ||
1105                      prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
1106                if (ctx->FragmentProgram.Current &&
1107                    ctx->FragmentProgram.Current->Base.Id == ids[i]) {
1108                   /* unbind this currently bound program */
1109                   _mesa_BindProgram(prog->Target, 0);
1110                }
1111             }
1112             else {
1113                _mesa_problem(ctx, "bad target in glDeleteProgramsNV");
1114                return;
1115             }
1116             /* The ID is immediately available for re-use now */
1117             _mesa_HashRemove(ctx->Shared->Programs, ids[i]);
1118             prog->RefCount--;
1119             if (prog->RefCount <= 0) {
1120                ctx->Driver.DeleteProgram(ctx, prog);
1121             }
1122          }
1123       }
1124    }
1125 }
1126
1127
1128 /**
1129  * Generate a list of new program identifiers.
1130  * \note Not compiled into display lists.
1131  * \note Called by both glGenProgramsNV and glGenProgramsARB.
1132  */
1133 void GLAPIENTRY
1134 _mesa_GenPrograms(GLsizei n, GLuint *ids)
1135 {
1136    GLuint first;
1137    GLuint i;
1138    GET_CURRENT_CONTEXT(ctx);
1139    ASSERT_OUTSIDE_BEGIN_END(ctx);
1140
1141    if (n < 0) {
1142       _mesa_error(ctx, GL_INVALID_VALUE, "glGenPrograms");
1143       return;
1144    }
1145
1146    if (!ids)
1147       return;
1148
1149    first = _mesa_HashFindFreeKeyBlock(ctx->Shared->Programs, n);
1150
1151    /* Insert pointer to dummy program as placeholder */
1152    for (i = 0; i < (GLuint) n; i++) {
1153       _mesa_HashInsert(ctx->Shared->Programs, first + i, &_mesa_DummyProgram);
1154    }
1155
1156    /* Return the program names */
1157    for (i = 0; i < (GLuint) n; i++) {
1158       ids[i] = first + i;
1159    }
1160 }
1161
1162
1163 /**
1164  * Determine if id names a vertex or fragment program.
1165  * \note Not compiled into display lists.
1166  * \note Called from both glIsProgramNV and glIsProgramARB.
1167  * \param id is the program identifier
1168  * \return GL_TRUE if id is a program, else GL_FALSE.
1169  */
1170 GLboolean GLAPIENTRY
1171 _mesa_IsProgram(GLuint id)
1172 {
1173    GET_CURRENT_CONTEXT(ctx);
1174    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
1175
1176    if (id == 0)
1177       return GL_FALSE;
1178
1179    if (_mesa_HashLookup(ctx->Shared->Programs, id))
1180       return GL_TRUE;
1181    else
1182       return GL_FALSE;
1183 }
1184
1185
1186
1187 /**********************************************************************/
1188 /* GL_MESA_program_debug extension                                    */
1189 /**********************************************************************/
1190
1191
1192 /* XXX temporary */
1193 GLAPI void GLAPIENTRY
1194 glProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
1195                       GLvoid *data)
1196 {
1197    _mesa_ProgramCallbackMESA(target, callback, data);
1198 }
1199
1200
1201 void
1202 _mesa_ProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
1203                           GLvoid *data)
1204 {
1205    GET_CURRENT_CONTEXT(ctx);
1206
1207    switch (target) {
1208       case GL_FRAGMENT_PROGRAM_ARB:
1209          if (!ctx->Extensions.ARB_fragment_program) {
1210             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1211             return;
1212          }
1213          ctx->FragmentProgram.Callback = callback;
1214          ctx->FragmentProgram.CallbackData = data;
1215          break;
1216       case GL_FRAGMENT_PROGRAM_NV:
1217          if (!ctx->Extensions.NV_fragment_program) {
1218             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1219             return;
1220          }
1221          ctx->FragmentProgram.Callback = callback;
1222          ctx->FragmentProgram.CallbackData = data;
1223          break;
1224       case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
1225          if (!ctx->Extensions.ARB_vertex_program &&
1226              !ctx->Extensions.NV_vertex_program) {
1227             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1228             return;
1229          }
1230          ctx->VertexProgram.Callback = callback;
1231          ctx->VertexProgram.CallbackData = data;
1232          break;
1233       default:
1234          _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1235          return;
1236    }
1237 }
1238
1239
1240 /* XXX temporary */
1241 GLAPI void GLAPIENTRY
1242 glGetProgramRegisterfvMESA(GLenum target,
1243                            GLsizei len, const GLubyte *registerName,
1244                            GLfloat *v)
1245 {
1246    _mesa_GetProgramRegisterfvMESA(target, len, registerName, v);
1247 }
1248
1249
1250 void
1251 _mesa_GetProgramRegisterfvMESA(GLenum target,
1252                                GLsizei len, const GLubyte *registerName,
1253                                GLfloat *v)
1254 {
1255    char reg[1000];
1256    GET_CURRENT_CONTEXT(ctx);
1257
1258    /* We _should_ be inside glBegin/glEnd */
1259 #if 0
1260    if (ctx->Driver.CurrentExecPrimitive == PRIM_OUTSIDE_BEGIN_END) {
1261       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetProgramRegisterfvMESA");
1262       return;
1263    }
1264 #endif
1265
1266    /* make null-terminated copy of registerName */
1267    len = MIN2((unsigned int) len, sizeof(reg) - 1);
1268    _mesa_memcpy(reg, registerName, len);
1269    reg[len] = 0;
1270
1271    switch (target) {
1272       case GL_VERTEX_PROGRAM_NV:
1273          if (!ctx->Extensions.ARB_vertex_program &&
1274              !ctx->Extensions.NV_vertex_program) {
1275             _mesa_error(ctx, GL_INVALID_ENUM,
1276                         "glGetProgramRegisterfvMESA(target)");
1277             return;
1278          }
1279          if (!ctx->VertexProgram._Enabled) {
1280             _mesa_error(ctx, GL_INVALID_OPERATION,
1281                         "glGetProgramRegisterfvMESA");
1282             return;
1283          }
1284          /* GL_NV_vertex_program */
1285          if (reg[0] == 'R') {
1286             /* Temp register */
1287             GLint i = _mesa_atoi(reg + 1);
1288             if (i >= (GLint)ctx->Const.MaxVertexProgramTemps) {
1289                _mesa_error(ctx, GL_INVALID_VALUE,
1290                            "glGetProgramRegisterfvMESA(registerName)");
1291                return;
1292             }
1293             COPY_4V(v, ctx->VertexProgram.Temporaries[i]);
1294          }
1295          else if (reg[0] == 'v' && reg[1] == '[') {
1296             /* Vertex Input attribute */
1297             GLuint i;
1298             for (i = 0; i < ctx->Const.MaxVertexProgramAttribs; i++) {
1299                const char *name = _mesa_nv_vertex_input_register_name(i);
1300                char number[10];
1301                sprintf(number, "%d", i);
1302                if (_mesa_strncmp(reg + 2, name, 4) == 0 ||
1303                    _mesa_strncmp(reg + 2, number, _mesa_strlen(number)) == 0) {
1304                   COPY_4V(v, ctx->VertexProgram.Inputs[i]);
1305                   return;
1306                }
1307             }
1308             _mesa_error(ctx, GL_INVALID_VALUE,
1309                         "glGetProgramRegisterfvMESA(registerName)");
1310             return;
1311          }
1312          else if (reg[0] == 'o' && reg[1] == '[') {
1313             /* Vertex output attribute */
1314          }
1315          /* GL_ARB_vertex_program */
1316          else if (_mesa_strncmp(reg, "vertex.", 7) == 0) {
1317
1318          }
1319          else {
1320             _mesa_error(ctx, GL_INVALID_VALUE,
1321                         "glGetProgramRegisterfvMESA(registerName)");
1322             return;
1323          }
1324          break;
1325       case GL_FRAGMENT_PROGRAM_ARB:
1326          if (!ctx->Extensions.ARB_fragment_program) {
1327             _mesa_error(ctx, GL_INVALID_ENUM,
1328                         "glGetProgramRegisterfvMESA(target)");
1329             return;
1330          }
1331          if (!ctx->FragmentProgram._Enabled) {
1332             _mesa_error(ctx, GL_INVALID_OPERATION,
1333                         "glGetProgramRegisterfvMESA");
1334             return;
1335          }
1336          /* XXX to do */
1337          break;
1338       case GL_FRAGMENT_PROGRAM_NV:
1339          if (!ctx->Extensions.NV_fragment_program) {
1340             _mesa_error(ctx, GL_INVALID_ENUM,
1341                         "glGetProgramRegisterfvMESA(target)");
1342             return;
1343          }
1344          if (!ctx->FragmentProgram._Enabled) {
1345             _mesa_error(ctx, GL_INVALID_OPERATION,
1346                         "glGetProgramRegisterfvMESA");
1347             return;
1348          }
1349          if (reg[0] == 'R') {
1350             /* Temp register */
1351             GLint i = _mesa_atoi(reg + 1);
1352             if (i >= (GLint)ctx->Const.MaxFragmentProgramTemps) {
1353                _mesa_error(ctx, GL_INVALID_VALUE,
1354                            "glGetProgramRegisterfvMESA(registerName)");
1355                return;
1356             }
1357             COPY_4V(v, ctx->FragmentProgram.Machine.Temporaries[i]);
1358          }
1359          else if (reg[0] == 'f' && reg[1] == '[') {
1360             /* Fragment input attribute */
1361             GLuint i;
1362             for (i = 0; i < ctx->Const.MaxFragmentProgramAttribs; i++) {
1363                const char *name = _mesa_nv_fragment_input_register_name(i);
1364                if (_mesa_strncmp(reg + 2, name, 4) == 0) {
1365                   COPY_4V(v, ctx->FragmentProgram.Machine.Inputs[i]);
1366                   return;
1367                }
1368             }
1369             _mesa_error(ctx, GL_INVALID_VALUE,
1370                         "glGetProgramRegisterfvMESA(registerName)");
1371             return;
1372          }
1373          else if (_mesa_strcmp(reg, "o[COLR]") == 0) {
1374             /* Fragment output color */
1375             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLR]);
1376          }
1377          else if (_mesa_strcmp(reg, "o[COLH]") == 0) {
1378             /* Fragment output color */
1379             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLH]);
1380          }
1381          else if (_mesa_strcmp(reg, "o[DEPR]") == 0) {
1382             /* Fragment output depth */
1383             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_DEPR]);
1384          }
1385          else {
1386             /* try user-defined identifiers */
1387             const GLfloat *value = _mesa_lookup_parameter_value(
1388                        ctx->FragmentProgram.Current->Parameters, -1, reg);
1389             if (value) {
1390                COPY_4V(v, value);
1391             }
1392             else {
1393                _mesa_error(ctx, GL_INVALID_VALUE,
1394                            "glGetProgramRegisterfvMESA(registerName)");
1395                return;
1396             }
1397          }
1398          break;
1399       default:
1400          _mesa_error(ctx, GL_INVALID_ENUM,
1401                      "glGetProgramRegisterfvMESA(target)");
1402          return;
1403    }
1404
1405 }