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    _mesa_free(paramList->ParameterValues);
 357    _mesa_free(paramList);
 358    paramList->Parameters = NULL;
 359    paramList->ParameterValues = NULL;
 360 }
 361
 362
 363 /**
 364  * Free all the parameters in the given list, but don't free the
 365  * paramList structure itself.
 366  */
 367 void
 368 _mesa_free_parameters(struct program_parameter_list *paramList)
 369 {
 370    GLuint i;
 371    for (i = 0; i < paramList->NumParameters; i++) {
 372       if (paramList->Parameters[i].Name)
 373          _mesa_free((void *) paramList->Parameters[i].Name);
 374    }
 375    paramList->NumParameters = 0;
 376 }
 377
 378
 379 /**
 380  * Helper function used by the functions below.
 381  */
 382 static GLint
 383 add_parameter(struct program_parameter_list *paramList,
 384               const char *name, const GLfloat values[4],
 385               enum parameter_type type)
 386 {
 387    const GLuint n = paramList->NumParameters;
 388
 389    if (n == paramList->Size) {
 390       paramList->Size *= 2;
 391       if (!paramList->Size)
 392          paramList->Size = 4;
 393
 394       paramList->Parameters = (struct program_parameter *)
 395          _mesa_realloc(paramList->Parameters,
 396                        n * sizeof(struct program_parameter),
 397                        paramList->Size * sizeof(struct program_parameter));
 398       paramList->ParameterValues = (GLfloat (*)[4])
 399          _mesa_realloc(paramList->ParameterValues,
 400                        n * 4 * sizeof(GLfloat),
 401                        paramList->Size * 4 * sizeof(GLfloat));
 402    }
 403
 404    if (!paramList->Parameters ||
 405        !paramList->ParameterValues) {
 406       /* out of memory */
 407       paramList->NumParameters = 0;
 408       paramList->Size = 0;
 409       return -1;
 410    }
 411    else {
 412       paramList->NumParameters = n + 1;
 413       paramList->Parameters[n].Name = name ? _mesa_strdup(name) : NULL;
 414       paramList->Parameters[n].Type = type;
 415       if (values)
 416          COPY_4V(paramList->ParameterValues[n], values);
 417       return (GLint) n;
 418    }
 419 }
 420
 421
 422 /**
 423  * Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
 424  * \return index of the new entry in the parameter list
 425  */
 426 GLint
 427 _mesa_add_named_parameter(struct program_parameter_list *paramList,
 428                           const char *name, const GLfloat values[4])
 429 {
 430    return add_parameter(paramList, name, values, NAMED_PARAMETER);
 431 }
 432
 433
 434 /**
 435  * Add a new unnamed constant to the parameter list.
 436  * \param paramList - the parameter list
 437  * \param values - four float values
 438  * \return index of the new parameter.
 439  */
 440 GLint
 441 _mesa_add_named_constant(struct program_parameter_list *paramList,
 442                          const char *name, const GLfloat values[4])
 443 {
 444    return add_parameter(paramList, name, values, CONSTANT);
 445 }
 446
 447
 448 /**
 449  * Add a new unnamed constant to the parameter list.
 450  * \param paramList - the parameter list
 451  * \param values - four float values
 452  * \return index of the new parameter.
 453  */
 454 GLint
 455 _mesa_add_unnamed_constant(struct program_parameter_list *paramList,
 456                            const GLfloat values[4])
 457 {
 458    return add_parameter(paramList, NULL, values, CONSTANT);
 459 }
 460
 461
 462 /**
 463  * Add a new state reference to the parameter list.
 464  * \param paramList - the parameter list
 465  * \param state     - an array of 6 state tokens
 466  *
 467  * \return index of the new parameter.
 468  */
 469 GLint
 470 _mesa_add_state_reference(struct program_parameter_list *paramList,
 471                           GLint *stateTokens)
 472 {
 473    /* XXX Should we parse <stateString> here and produce the parameter's
 474     * list of STATE_* tokens here, or in the parser?
 475     */
 476    GLint a, idx;
 477
 478    idx = add_parameter(paramList, NULL, NULL, STATE);
 479
 480    for (a=0; a<6; a++)
 481       paramList->Parameters[idx].StateIndexes[a] = (enum state_index) stateTokens[a];
 482
 483    return idx;
 484 }
 485
 486
 487 /**
 488  * Lookup a parameter value by name in the given parameter list.
 489  * \return pointer to the float[4] values.
 490  */
 491 GLfloat *
 492 _mesa_lookup_parameter_value(struct program_parameter_list *paramList,
 493                              GLsizei nameLen, const char *name)
 494 {
 495    GLuint i;
 496
 497    if (!paramList)
 498       return NULL;
 499
 500    if (nameLen == -1) {
 501       /* name is null-terminated */
 502       for (i = 0; i < paramList->NumParameters; i++) {
 503          if (paramList->Parameters[i].Name &&
 504              _mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 505             return paramList->ParameterValues[i];
 506       }
 507    }
 508    else {
 509       /* name is not null-terminated, use nameLen */
 510       for (i = 0; i < paramList->NumParameters; i++) {
 511          if (paramList->Parameters[i].Name &&
 512              _mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 513              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 514             return paramList->ParameterValues[i];
 515       }
 516    }
 517    return NULL;
 518 }
 519
 520
 521 /**
 522  * Lookup a parameter index by name in the given parameter list.
 523  * \return index of parameter in the list.
 524  */
 525 GLint
 526 _mesa_lookup_parameter_index(struct program_parameter_list *paramList,
 527                              GLsizei nameLen, const char *name)
 528 {
 529    GLint i;
 530
 531    if (!paramList)
 532       return -1;
 533
 534    if (nameLen == -1) {
 535       /* name is null-terminated */
 536       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 537          if (paramList->Parameters[i].Name &&
 538              _mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 539             return i;
 540       }
 541    }
 542    else {
 543       /* name is not null-terminated, use nameLen */
 544       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 545          if (paramList->Parameters[i].Name &&
 546              _mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 547              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 548             return i;
 549       }
 550    }
 551    return -1;
 552 }
 553
 554
 555 /**
 556  * Use the list of tokens in the state[] array to find global GL state
 557  * and return it in <value>.  Usually, four values are returned in <value>
 558  * but matrix queries may return as many as 16 values.
 559  * This function is used for ARB vertex/fragment programs.
 560  * The program parser will produce the state[] values.
 561  */
 562 static void
 563 _mesa_fetch_state(GLcontext *ctx, const enum state_index state[],
 564                   GLfloat *value)
 565 {
 566    switch (state[0]) {
 567    case STATE_MATERIAL:
 568       {
 569          /* state[1] is either 0=front or 1=back side */
 570          const GLuint face = (GLuint) state[1];
 571          /* state[2] is the material attribute */
 572          switch (state[2]) {
 573          case STATE_AMBIENT:
 574             if (face == 0)
 575                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT]);
 576             else
 577                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT]);
 578             return;
 579          case STATE_DIFFUSE:
 580             if (face == 0)
 581                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE]);
 582             else
 583                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE]);
 584             return;
 585          case STATE_SPECULAR:
 586             if (face == 0)
 587                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR]);
 588             else
 589                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SPECULAR]);
 590             return;
 591          case STATE_EMISSION:
 592             if (face == 0)
 593                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION]);
 594             else
 595                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION]);
 596             return;
 597          case STATE_SHININESS:
 598             if (face == 0)
 599                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SHININESS][0];
 600             else
 601                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SHININESS][0];
 602             value[1] = 0.0F;
 603             value[2] = 0.0F;
 604             value[3] = 1.0F;
 605             return;
 606          default:
 607             _mesa_problem(ctx, "Invalid material state in fetch_state");
 608             return;
 609          }
 610       }
 611    case STATE_LIGHT:
 612       {
 613          /* state[1] is the light number */
 614          const GLuint ln = (GLuint) state[1];
 615          /* state[2] is the light attribute */
 616          switch (state[2]) {
 617          case STATE_AMBIENT:
 618             COPY_4V(value, ctx->Light.Light[ln].Ambient);
 619             return;
 620          case STATE_DIFFUSE:
 621             COPY_4V(value, ctx->Light.Light[ln].Diffuse);
 622             return;
 623          case STATE_SPECULAR:
 624             COPY_4V(value, ctx->Light.Light[ln].Specular);
 625             return;
 626          case STATE_POSITION:
 627             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 628             return;
 629          case STATE_ATTENUATION:
 630             value[0] = ctx->Light.Light[ln].ConstantAttenuation;
 631             value[1] = ctx->Light.Light[ln].LinearAttenuation;
 632             value[2] = ctx->Light.Light[ln].QuadraticAttenuation;
 633             value[3] = ctx->Light.Light[ln].SpotExponent;
 634             return;
 635          case STATE_SPOT_DIRECTION:
 636             COPY_3V(value, ctx->Light.Light[ln].EyeDirection);
 637             value[3] = ctx->Light.Light[ln]._CosCutoff;
 638             return;
 639          case STATE_HALF:
 640             {
 641                GLfloat eye_z[] = {0, 0, 1};
 642
 643                /* Compute infinite half angle vector:
 644                 *   half-vector = light_position + (0, 0, 1)
 645                 * and then normalize.  w = 0
 646                 *
 647                 * light.EyePosition.w should be 0 for infinite lights.
 648                 */
 649                ADD_3V(value, eye_z, ctx->Light.Light[ln].EyePosition);
 650                NORMALIZE_3FV(value);
 651                value[3] = 0;
 652             }
 653             return;
 654          case STATE_POSITION_NORMALIZED:
 655             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 656             NORMALIZE_3FV( value );
 657             return;
 658          default:
 659             _mesa_problem(ctx, "Invalid light state in fetch_state");
 660             return;
 661          }
 662       }
 663    case STATE_LIGHTMODEL_AMBIENT:
 664       COPY_4V(value, ctx->Light.Model.Ambient);
 665       return;
 666    case STATE_LIGHTMODEL_SCENECOLOR:
 667       if (state[1] == 0) {
 668          /* front */
 669          GLint i;
 670          for (i = 0; i < 3; i++) {
 671             value[i] = ctx->Light.Model.Ambient[i]
 672                * ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT][i]
 673                + ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION][i];
 674          }
 675          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
 676       }
 677       else {
 678          /* back */
 679          GLint i;
 680          for (i = 0; i < 3; i++) {
 681             value[i] = ctx->Light.Model.Ambient[i]
 682                * ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT][i]
 683                + ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION][i];
 684          }
 685          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
 686       }
 687       return;
 688    case STATE_LIGHTPROD:
 689       {
 690          const GLuint ln = (GLuint) state[1];
 691          const GLuint face = (GLuint) state[2];
 692          GLint i;
 693          ASSERT(face == 0 || face == 1);
 694          switch (state[3]) {
 695             case STATE_AMBIENT:
 696                for (i = 0; i < 3; i++) {
 697                   value[i] = ctx->Light.Light[ln].Ambient[i] *
 698                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][i];
 699                }
 700                /* [3] = material alpha */
 701                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 702                return;
 703             case STATE_DIFFUSE:
 704                for (i = 0; i < 3; i++) {
 705                   value[i] = ctx->Light.Light[ln].Diffuse[i] *
 706                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][i];
 707                }
 708                /* [3] = material alpha */
 709                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 710                return;
 711             case STATE_SPECULAR:
 712                for (i = 0; i < 3; i++) {
 713                   value[i] = ctx->Light.Light[ln].Specular[i] *
 714                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][i];
 715                }
 716                /* [3] = material alpha */
 717                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 718                return;
 719             default:
 720                _mesa_problem(ctx, "Invalid lightprod state in fetch_state");
 721                return;
 722          }
 723       }
 724    case STATE_TEXGEN:
 725       {
 726          /* state[1] is the texture unit */
 727          const GLuint unit = (GLuint) state[1];
 728          /* state[2] is the texgen attribute */
 729          switch (state[2]) {
 730          case STATE_TEXGEN_EYE_S:
 731             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneS);
 732             return;
 733          case STATE_TEXGEN_EYE_T:
 734             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneT);
 735             return;
 736          case STATE_TEXGEN_EYE_R:
 737             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneR);
 738             return;
 739          case STATE_TEXGEN_EYE_Q:
 740             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneQ);
 741             return;
 742          case STATE_TEXGEN_OBJECT_S:
 743             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneS);
 744             return;
 745          case STATE_TEXGEN_OBJECT_T:
 746             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneT);
 747             return;
 748          case STATE_TEXGEN_OBJECT_R:
 749             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneR);
 750             return;
 751          case STATE_TEXGEN_OBJECT_Q:
 752             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneQ);
 753             return;
 754          default:
 755             _mesa_problem(ctx, "Invalid texgen state in fetch_state");
 756             return;
 757          }
 758       }
 759    case STATE_TEXENV_COLOR:
 760       {
 761          /* state[1] is the texture unit */
 762          const GLuint unit = (GLuint) state[1];
 763          COPY_4V(value, ctx->Texture.Unit[unit].EnvColor);
 764       }
 765       return;
 766    case STATE_FOG_COLOR:
 767       COPY_4V(value, ctx->Fog.Color);
 768       return;
 769    case STATE_FOG_PARAMS:
 770       value[0] = ctx->Fog.Density;
 771       value[1] = ctx->Fog.Start;
 772       value[2] = ctx->Fog.End;
 773       value[3] = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
 774       return;
 775    case STATE_CLIPPLANE:
 776       {
 777          const GLuint plane = (GLuint) state[1];
 778          COPY_4V(value, ctx->Transform.EyeUserPlane[plane]);
 779       }
 780       return;
 781    case STATE_POINT_SIZE:
 782       value[0] = ctx->Point.Size;
 783       value[1] = ctx->Point.MinSize;
 784       value[2] = ctx->Point.MaxSize;
 785       value[3] = ctx->Point.Threshold;
 786       return;
 787    case STATE_POINT_ATTENUATION:
 788       value[0] = ctx->Point.Params[0];
 789       value[1] = ctx->Point.Params[1];
 790       value[2] = ctx->Point.Params[2];
 791       value[3] = 1.0F;
 792       return;
 793    case STATE_MATRIX:
 794       {
 795          /* state[1] = modelview, projection, texture, etc. */
 796          /* state[2] = which texture matrix or program matrix */
 797          /* state[3] = first column to fetch */
 798          /* state[4] = last column to fetch */
 799          /* state[5] = transpose, inverse or invtrans */
 800
 801          const GLmatrix *matrix;
 802          const enum state_index mat = state[1];
 803          const GLuint index = (GLuint) state[2];
 804          const GLuint first = (GLuint) state[3];
 805          const GLuint last = (GLuint) state[4];
 806          const enum state_index modifier = state[5];
 807          const GLfloat *m;
 808          GLuint row, i;
 809          if (mat == STATE_MODELVIEW) {
 810             matrix = ctx->ModelviewMatrixStack.Top;
 811          }
 812          else if (mat == STATE_PROJECTION) {
 813             matrix = ctx->ProjectionMatrixStack.Top;
 814          }
 815          else if (mat == STATE_MVP) {
 816             matrix = &ctx->_ModelProjectMatrix;
 817          }
 818          else if (mat == STATE_TEXTURE) {
 819             matrix = ctx->TextureMatrixStack[index].Top;
 820          }
 821          else if (mat == STATE_PROGRAM) {
 822             matrix = ctx->ProgramMatrixStack[index].Top;
 823          }
 824          else {
 825             _mesa_problem(ctx, "Bad matrix name in _mesa_fetch_state()");
 826             return;
 827          }
 828          if (modifier == STATE_MATRIX_INVERSE ||
 829              modifier == STATE_MATRIX_INVTRANS) {
 830             /* Be sure inverse is up to date:
 831              */
 832             _math_matrix_analyse( (GLmatrix*) matrix );
 833             m = matrix->inv;
 834          }
 835          else {
 836             m = matrix->m;
 837          }
 838          if (modifier == STATE_MATRIX_TRANSPOSE ||
 839              modifier == STATE_MATRIX_INVTRANS) {
 840             for (i = 0, row = first; row <= last; row++) {
 841                value[i++] = m[row * 4 + 0];
 842                value[i++] = m[row * 4 + 1];
 843                value[i++] = m[row * 4 + 2];
 844                value[i++] = m[row * 4 + 3];
 845             }
 846          }
 847          else {
 848             for (i = 0, row = first; row <= last; row++) {
 849                value[i++] = m[row + 0];
 850                value[i++] = m[row + 4];
 851                value[i++] = m[row + 8];
 852                value[i++] = m[row + 12];
 853             }
 854          }
 855       }
 856       return;
 857    case STATE_DEPTH_RANGE:
 858       value[0] = ctx->Viewport.Near;                     /* near       */
 859       value[1] = ctx->Viewport.Far;                      /* far        */
 860       value[2] = ctx->Viewport.Far - ctx->Viewport.Near; /* far - near */
 861       value[3] = 0;
 862       return;
 863    case STATE_FRAGMENT_PROGRAM:
 864       {
 865          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 866          /* state[2] = parameter index          */
 867          const int idx = (int) state[2];
 868          switch (state[1]) {
 869             case STATE_ENV:
 870                COPY_4V(value, ctx->FragmentProgram.Parameters[idx]);
 871                break;
 872             case STATE_LOCAL:
 873                COPY_4V(value, ctx->FragmentProgram.Current->Base.LocalParams[idx]);
 874                break;
 875             default:
 876                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 877                return;
 878          }
 879       }
 880       return;
 881
 882    case STATE_VERTEX_PROGRAM:
 883       {
 884          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 885          /* state[2] = parameter index          */
 886          const int idx = (int) state[2];
 887          switch (state[1]) {
 888             case STATE_ENV:
 889                COPY_4V(value, ctx->VertexProgram.Parameters[idx]);
 890                break;
 891             case STATE_LOCAL:
 892                COPY_4V(value, ctx->VertexProgram.Current->Base.LocalParams[idx]);
 893                break;
 894             default:
 895                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 896                return;
 897          }
 898       }
 899       return;
 900
 901    case STATE_INTERNAL:
 902       {
 903          switch (state[1]) {
 904             case STATE_NORMAL_SCALE:
 905                ASSIGN_4V(value, ctx->_ModelViewInvScale, 0, 0, 1);
 906                break;
 907             default:
 908                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 909                return;
 910          }
 911       }
 912       return;
 913
 914    default:
 915       _mesa_problem(ctx, "Invalid state in _mesa_fetch_state");
 916       return;
 917    }
 918 }
 919
 920
 921 /**
 922  * Loop over all the parameters in a parameter list.  If the parameter
 923  * is a GL state reference, look up the current value of that state
 924  * variable and put it into the parameter's Value[4] array.
 925  * This would be called at glBegin time when using a fragment program.
 926  */
 927 void
 928 _mesa_load_state_parameters(GLcontext *ctx,
 929                             struct program_parameter_list *paramList)
 930 {
 931    GLuint i;
 932
 933    if (!paramList)
 934       return;
 935
 936    for (i = 0; i < paramList->NumParameters; i++) {
 937       if (paramList->Parameters[i].Type == STATE) {
 938          _mesa_fetch_state(ctx,
 939                            paramList->Parameters[i].StateIndexes,
 940                            paramList->ParameterValues[i]);
 941       }
 942    }
 943 }
 944
 945
 946
 947 /**********************************************************************/
 948 /* API functions                                                      */
 949 /**********************************************************************/
 950
 951
 952 /**
 953  * Bind a program (make it current)
 954  * \note Called from the GL API dispatcher by both glBindProgramNV
 955  * and glBindProgramARB.
 956  */
 957 void GLAPIENTRY
 958 _mesa_BindProgram(GLenum target, GLuint id)
 959 {
 960    struct program *prog;
 961    GET_CURRENT_CONTEXT(ctx);
 962    ASSERT_OUTSIDE_BEGIN_END(ctx);
 963
 964    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 965
 966    if ((target == GL_VERTEX_PROGRAM_NV
 967         && ctx->Extensions.NV_vertex_program) ||
 968        (target == GL_VERTEX_PROGRAM_ARB
 969         && ctx->Extensions.ARB_vertex_program)) {
 970       /*** Vertex program binding ***/
 971       struct vertex_program *curProg = ctx->VertexProgram.Current;
 972       if (curProg->Base.Id == id) {
 973          /* binding same program - no change */
 974          return;
 975       }
 976       if (curProg->Base.Id != 0) {
 977          /* decrement refcount on previously bound vertex program */
 978          curProg->Base.RefCount--;
 979          /* and delete if refcount goes below one */
 980          if (curProg->Base.RefCount <= 0) {
 981             /* the program ID was already removed from the hash table */
 982             ctx->Driver.DeleteProgram(ctx, &(curProg->Base));
 983          }
 984       }
 985    }
 986    else if ((target == GL_FRAGMENT_PROGRAM_NV
 987              && ctx->Extensions.NV_fragment_program) ||
 988             (target == GL_FRAGMENT_PROGRAM_ARB
 989              && ctx->Extensions.ARB_fragment_program)) {
 990       /*** Fragment program binding ***/
 991       struct fragment_program *curProg = ctx->FragmentProgram.Current;
 992       if (curProg->Base.Id == id) {
 993          /* binding same program - no change */
 994          return;
 995       }
 996       if (curProg->Base.Id != 0) {
 997          /* decrement refcount on previously bound fragment program */
 998          curProg->Base.RefCount--;
 999          /* and delete if refcount goes below one */
1000          if (curProg->Base.RefCount <= 0) {
1001             /* the program ID was already removed from the hash table */
1002             ctx->Driver.DeleteProgram(ctx, &(curProg->Base));
1003          }
1004       }
1005    }
1006    else {
1007       _mesa_error(ctx, GL_INVALID_ENUM, "glBindProgramNV/ARB(target)");
1008       return;
1009    }
1010
1011    /* NOTE: binding to a non-existant program is not an error.
1012     * That's supposed to be caught in glBegin.
1013     */
1014    if (id == 0) {
1015       /* Bind default program */
1016       prog = NULL;
1017       if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB)
1018          prog = ctx->Shared->DefaultVertexProgram;
1019       else
1020          prog = ctx->Shared->DefaultFragmentProgram;
1021    }
1022    else {
1023       /* Bind user program */
1024       prog = (struct program *) _mesa_HashLookup(ctx->Shared->Programs, id);
1025       if (!prog || prog == &_mesa_DummyProgram) {
1026          /* allocate a new program now */
1027          prog = ctx->Driver.NewProgram(ctx, target, id);
1028          if (!prog) {
1029             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindProgramNV/ARB");
1030             return;
1031          }
1032          _mesa_HashInsert(ctx->Shared->Programs, id, prog);
1033       }
1034       else if (prog->Target != target) {
1035          _mesa_error(ctx, GL_INVALID_OPERATION,
1036                      "glBindProgramNV/ARB(target mismatch)");
1037          return;
1038       }
1039    }
1040
1041    /* bind now */
1042    if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB) {
1043       ctx->VertexProgram.Current = (struct vertex_program *) prog;
1044    }
1045    else if (target == GL_FRAGMENT_PROGRAM_NV || target == GL_FRAGMENT_PROGRAM_ARB) {
1046       ctx->FragmentProgram.Current = (struct fragment_program *) prog;
1047    }
1048
1049    /* Never null pointers */
1050    ASSERT(ctx->VertexProgram.Current);
1051    ASSERT(ctx->FragmentProgram.Current);
1052
1053    if (prog)
1054       prog->RefCount++;
1055
1056    if (ctx->Driver.BindProgram)
1057       ctx->Driver.BindProgram(ctx, target, prog);
1058 }
1059
1060
1061 /**
1062  * Delete a list of programs.
1063  * \note Not compiled into display lists.
1064  * \note Called by both glDeleteProgramsNV and glDeleteProgramsARB.
1065  */
1066 void GLAPIENTRY
1067 _mesa_DeletePrograms(GLsizei n, const GLuint *ids)
1068 {
1069    GLint i;
1070    GET_CURRENT_CONTEXT(ctx);
1071    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1072
1073    if (n < 0) {
1074       _mesa_error( ctx, GL_INVALID_VALUE, "glDeleteProgramsNV" );
1075       return;
1076    }
1077
1078    for (i = 0; i < n; i++) {
1079       if (ids[i] != 0) {
1080          struct program *prog = (struct program *)
1081             _mesa_HashLookup(ctx->Shared->Programs, ids[i]);
1082          if (prog == &_mesa_DummyProgram) {
1083             _mesa_HashRemove(ctx->Shared->Programs, ids[i]);
1084          }
1085          else if (prog) {
1086             /* Unbind program if necessary */
1087             if (prog->Target == GL_VERTEX_PROGRAM_NV ||
1088                 prog->Target == GL_VERTEX_STATE_PROGRAM_NV) {
1089                if (ctx->VertexProgram.Current &&
1090                    ctx->VertexProgram.Current->Base.Id == ids[i]) {
1091                   /* unbind this currently bound program */
1092                   _mesa_BindProgram(prog->Target, 0);
1093                }
1094             }
1095             else if (prog->Target == GL_FRAGMENT_PROGRAM_NV ||
1096                      prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
1097                if (ctx->FragmentProgram.Current &&
1098                    ctx->FragmentProgram.Current->Base.Id == ids[i]) {
1099                   /* unbind this currently bound program */
1100                   _mesa_BindProgram(prog->Target, 0);
1101                }
1102             }
1103             else {
1104                _mesa_problem(ctx, "bad target in glDeleteProgramsNV");
1105                return;
1106             }
1107             /* The ID is immediately available for re-use now */
1108             _mesa_HashRemove(ctx->Shared->Programs, ids[i]);
1109             prog->RefCount--;
1110             if (prog->RefCount <= 0) {
1111                ctx->Driver.DeleteProgram(ctx, prog);
1112             }
1113          }
1114       }
1115    }
1116 }
1117
1118
1119 /**
1120  * Generate a list of new program identifiers.
1121  * \note Not compiled into display lists.
1122  * \note Called by both glGenProgramsNV and glGenProgramsARB.
1123  */
1124 void GLAPIENTRY
1125 _mesa_GenPrograms(GLsizei n, GLuint *ids)
1126 {
1127    GLuint first;
1128    GLuint i;
1129    GET_CURRENT_CONTEXT(ctx);
1130    ASSERT_OUTSIDE_BEGIN_END(ctx);
1131
1132    if (n < 0) {
1133       _mesa_error(ctx, GL_INVALID_VALUE, "glGenPrograms");
1134       return;
1135    }
1136
1137    if (!ids)
1138       return;
1139
1140    first = _mesa_HashFindFreeKeyBlock(ctx->Shared->Programs, n);
1141
1142    /* Insert pointer to dummy program as placeholder */
1143    for (i = 0; i < (GLuint) n; i++) {
1144       _mesa_HashInsert(ctx->Shared->Programs, first + i, &_mesa_DummyProgram);
1145    }
1146
1147    /* Return the program names */
1148    for (i = 0; i < (GLuint) n; i++) {
1149       ids[i] = first + i;
1150    }
1151 }
1152
1153
1154 /**
1155  * Determine if id names a vertex or fragment program.
1156  * \note Not compiled into display lists.
1157  * \note Called from both glIsProgramNV and glIsProgramARB.
1158  * \param id is the program identifier
1159  * \return GL_TRUE if id is a program, else GL_FALSE.
1160  */
1161 GLboolean GLAPIENTRY
1162 _mesa_IsProgram(GLuint id)
1163 {
1164    GET_CURRENT_CONTEXT(ctx);
1165    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
1166
1167    if (id == 0)
1168       return GL_FALSE;
1169
1170    if (_mesa_HashLookup(ctx->Shared->Programs, id))
1171       return GL_TRUE;
1172    else
1173       return GL_FALSE;
1174 }
1175
1176
1177
1178 /**********************************************************************/
1179 /* GL_MESA_program_debug extension                                    */
1180 /**********************************************************************/
1181
1182
1183 /* XXX temporary */
1184 GLAPI void GLAPIENTRY
1185 glProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
1186                       GLvoid *data)
1187 {
1188    _mesa_ProgramCallbackMESA(target, callback, data);
1189 }
1190
1191
1192 void
1193 _mesa_ProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
1194                           GLvoid *data)
1195 {
1196    GET_CURRENT_CONTEXT(ctx);
1197
1198    switch (target) {
1199       case GL_FRAGMENT_PROGRAM_ARB:
1200          if (!ctx->Extensions.ARB_fragment_program) {
1201             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1202             return;
1203          }
1204          ctx->FragmentProgram.Callback = callback;
1205          ctx->FragmentProgram.CallbackData = data;
1206          break;
1207       case GL_FRAGMENT_PROGRAM_NV:
1208          if (!ctx->Extensions.NV_fragment_program) {
1209             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1210             return;
1211          }
1212          ctx->FragmentProgram.Callback = callback;
1213          ctx->FragmentProgram.CallbackData = data;
1214          break;
1215       case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
1216          if (!ctx->Extensions.ARB_vertex_program &&
1217              !ctx->Extensions.NV_vertex_program) {
1218             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1219             return;
1220          }
1221          ctx->VertexProgram.Callback = callback;
1222          ctx->VertexProgram.CallbackData = data;
1223          break;
1224       default:
1225          _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1226          return;
1227    }
1228 }
1229
1230
1231 /* XXX temporary */
1232 GLAPI void GLAPIENTRY
1233 glGetProgramRegisterfvMESA(GLenum target,
1234                            GLsizei len, const GLubyte *registerName,
1235                            GLfloat *v)
1236 {
1237    _mesa_GetProgramRegisterfvMESA(target, len, registerName, v);
1238 }
1239
1240
1241 void
1242 _mesa_GetProgramRegisterfvMESA(GLenum target,
1243                                GLsizei len, const GLubyte *registerName,
1244                                GLfloat *v)
1245 {
1246    char reg[1000];
1247    GET_CURRENT_CONTEXT(ctx);
1248
1249    /* We _should_ be inside glBegin/glEnd */
1250 #if 0
1251    if (ctx->Driver.CurrentExecPrimitive == PRIM_OUTSIDE_BEGIN_END) {
1252       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetProgramRegisterfvMESA");
1253       return;
1254    }
1255 #endif
1256
1257    /* make null-terminated copy of registerName */
1258    len = MIN2((unsigned int) len, sizeof(reg) - 1);
1259    _mesa_memcpy(reg, registerName, len);
1260    reg[len] = 0;
1261
1262    switch (target) {
1263       case GL_VERTEX_PROGRAM_NV:
1264          if (!ctx->Extensions.ARB_vertex_program &&
1265              !ctx->Extensions.NV_vertex_program) {
1266             _mesa_error(ctx, GL_INVALID_ENUM,
1267                         "glGetProgramRegisterfvMESA(target)");
1268             return;
1269          }
1270          if (!ctx->VertexProgram._Enabled) {
1271             _mesa_error(ctx, GL_INVALID_OPERATION,
1272                         "glGetProgramRegisterfvMESA");
1273             return;
1274          }
1275          /* GL_NV_vertex_program */
1276          if (reg[0] == 'R') {
1277             /* Temp register */
1278             GLint i = _mesa_atoi(reg + 1);
1279             if (i >= (GLint)ctx->Const.MaxVertexProgramTemps) {
1280                _mesa_error(ctx, GL_INVALID_VALUE,
1281                            "glGetProgramRegisterfvMESA(registerName)");
1282                return;
1283             }
1284             COPY_4V(v, ctx->VertexProgram.Temporaries[i]);
1285          }
1286          else if (reg[0] == 'v' && reg[1] == '[') {
1287             /* Vertex Input attribute */
1288             GLuint i;
1289             for (i = 0; i < ctx->Const.MaxVertexProgramAttribs; i++) {
1290                const char *name = _mesa_nv_vertex_input_register_name(i);
1291                char number[10];
1292                sprintf(number, "%d", i);
1293                if (_mesa_strncmp(reg + 2, name, 4) == 0 ||
1294                    _mesa_strncmp(reg + 2, number, _mesa_strlen(number)) == 0) {
1295                   COPY_4V(v, ctx->VertexProgram.Inputs[i]);
1296                   return;
1297                }
1298             }
1299             _mesa_error(ctx, GL_INVALID_VALUE,
1300                         "glGetProgramRegisterfvMESA(registerName)");
1301             return;
1302          }
1303          else if (reg[0] == 'o' && reg[1] == '[') {
1304             /* Vertex output attribute */
1305          }
1306          /* GL_ARB_vertex_program */
1307          else if (_mesa_strncmp(reg, "vertex.", 7) == 0) {
1308
1309          }
1310          else {
1311             _mesa_error(ctx, GL_INVALID_VALUE,
1312                         "glGetProgramRegisterfvMESA(registerName)");
1313             return;
1314          }
1315          break;
1316       case GL_FRAGMENT_PROGRAM_ARB:
1317          if (!ctx->Extensions.ARB_fragment_program) {
1318             _mesa_error(ctx, GL_INVALID_ENUM,
1319                         "glGetProgramRegisterfvMESA(target)");
1320             return;
1321          }
1322          if (!ctx->FragmentProgram._Enabled) {
1323             _mesa_error(ctx, GL_INVALID_OPERATION,
1324                         "glGetProgramRegisterfvMESA");
1325             return;
1326          }
1327          /* XXX to do */
1328          break;
1329       case GL_FRAGMENT_PROGRAM_NV:
1330          if (!ctx->Extensions.NV_fragment_program) {
1331             _mesa_error(ctx, GL_INVALID_ENUM,
1332                         "glGetProgramRegisterfvMESA(target)");
1333             return;
1334          }
1335          if (!ctx->FragmentProgram._Enabled) {
1336             _mesa_error(ctx, GL_INVALID_OPERATION,
1337                         "glGetProgramRegisterfvMESA");
1338             return;
1339          }
1340          if (reg[0] == 'R') {
1341             /* Temp register */
1342             GLint i = _mesa_atoi(reg + 1);
1343             if (i >= (GLint)ctx->Const.MaxFragmentProgramTemps) {
1344                _mesa_error(ctx, GL_INVALID_VALUE,
1345                            "glGetProgramRegisterfvMESA(registerName)");
1346                return;
1347             }
1348             COPY_4V(v, ctx->FragmentProgram.Machine.Temporaries[i]);
1349          }
1350          else if (reg[0] == 'f' && reg[1] == '[') {
1351             /* Fragment input attribute */
1352             GLuint i;
1353             for (i = 0; i < ctx->Const.MaxFragmentProgramAttribs; i++) {
1354                const char *name = _mesa_nv_fragment_input_register_name(i);
1355                if (_mesa_strncmp(reg + 2, name, 4) == 0) {
1356                   COPY_4V(v, ctx->FragmentProgram.Machine.Inputs[i]);
1357                   return;
1358                }
1359             }
1360             _mesa_error(ctx, GL_INVALID_VALUE,
1361                         "glGetProgramRegisterfvMESA(registerName)");
1362             return;
1363          }
1364          else if (_mesa_strcmp(reg, "o[COLR]") == 0) {
1365             /* Fragment output color */
1366             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLR]);
1367          }
1368          else if (_mesa_strcmp(reg, "o[COLH]") == 0) {
1369             /* Fragment output color */
1370             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLH]);
1371          }
1372          else if (_mesa_strcmp(reg, "o[DEPR]") == 0) {
1373             /* Fragment output depth */
1374             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_DEPR]);
1375          }
1376          else {
1377             /* try user-defined identifiers */
1378             const GLfloat *value = _mesa_lookup_parameter_value(
1379                        ctx->FragmentProgram.Current->Parameters, -1, reg);
1380             if (value) {
1381                COPY_4V(v, value);
1382             }
1383             else {
1384                _mesa_error(ctx, GL_INVALID_VALUE,
1385                            "glGetProgramRegisterfvMESA(registerName)");
1386                return;
1387             }
1388          }
1389          break;
1390       default:
1391          _mesa_error(ctx, GL_INVALID_ENUM,
1392                      "glGetProgramRegisterfvMESA(target)");
1393          return;
1394    }
1395
1396 }