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);
 356 }
 357
 358
 359 /**
 360  * Free all the parameters in the given list, but don't free the
 361  * paramList structure itself.
 362  */
 363 void
 364 _mesa_free_parameters(struct program_parameter_list *paramList)
 365 {
 366    GLuint i;
 367    for (i = 0; i < paramList->NumParameters; i++) {
 368       _mesa_free((void *) paramList->Parameters[i].Name);
 369    }
 370    _mesa_free(paramList->Parameters);
 371    paramList->NumParameters = 0;
 372    paramList->Parameters = NULL;
 373 }
 374
 375
 376 /**
 377  * Helper function used by the functions below.
 378  */
 379 static GLint
 380 add_parameter(struct program_parameter_list *paramList,
 381               const char *name, const GLfloat values[4],
 382               enum parameter_type type)
 383 {
 384    const GLuint n = paramList->NumParameters;
 385
 386    paramList->Parameters = (struct program_parameter *)
 387       _mesa_realloc(paramList->Parameters,
 388                     n * sizeof(struct program_parameter),
 389                     (n + 1) * sizeof(struct program_parameter));
 390    if (!paramList->Parameters) {
 391       /* out of memory */
 392       paramList->NumParameters = 0;
 393       return -1;
 394    }
 395    else {
 396       paramList->NumParameters = n + 1;
 397       paramList->Parameters[n].Name = _mesa_strdup(name);
 398       paramList->Parameters[n].Type = type;
 399       if (values)
 400          COPY_4V(paramList->Parameters[n].Values, values);
 401       return (GLint) n;
 402    }
 403 }
 404
 405
 406 /**
 407  * Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
 408  * \return index of the new entry in the parameter list
 409  */
 410 GLint
 411 _mesa_add_named_parameter(struct program_parameter_list *paramList,
 412                           const char *name, const GLfloat values[4])
 413 {
 414    return add_parameter(paramList, name, values, NAMED_PARAMETER);
 415 }
 416
 417
 418 /**
 419  * Add a new unnamed constant to the parameter list.
 420  * \param paramList - the parameter list
 421  * \param values - four float values
 422  * \return index of the new parameter.
 423  */
 424 GLint
 425 _mesa_add_named_constant(struct program_parameter_list *paramList,
 426                          const char *name, const GLfloat values[4])
 427 {
 428    return add_parameter(paramList, name, values, CONSTANT);
 429 }
 430
 431
 432 /**
 433  * Add a new unnamed constant to the parameter list.
 434  * \param paramList - the parameter list
 435  * \param values - four float values
 436  * \return index of the new parameter.
 437  */
 438 GLint
 439 _mesa_add_unnamed_constant(struct program_parameter_list *paramList,
 440                            const GLfloat values[4])
 441 {
 442    /* generate a new dummy name */
 443    static GLuint n = 0;
 444    char name[20];
 445    _mesa_sprintf(name, "constant%d", n);
 446    n++;
 447    /* store it */
 448    return add_parameter(paramList, name, values, CONSTANT);
 449 }
 450
 451
 452 /**
 453  * Add a new state reference to the parameter list.
 454  * \param paramList - the parameter list
 455  * \param state     - an array of 6 state tokens
 456  *
 457  * \return index of the new parameter.
 458  */
 459 GLint
 460 _mesa_add_state_reference(struct program_parameter_list *paramList,
 461                           GLint *stateTokens)
 462 {
 463    /* XXX Should we parse <stateString> here and produce the parameter's
 464     * list of STATE_* tokens here, or in the parser?
 465     */
 466    GLint a, idx;
 467
 468    idx = add_parameter(paramList, "Some State", NULL, STATE);
 469
 470    for (a=0; a<6; a++)
 471       paramList->Parameters[idx].StateIndexes[a] = (enum state_index) stateTokens[a];
 472
 473    return idx;
 474 }
 475
 476
 477 /**
 478  * Lookup a parameter value by name in the given parameter list.
 479  * \return pointer to the float[4] values.
 480  */
 481 GLfloat *
 482 _mesa_lookup_parameter_value(struct program_parameter_list *paramList,
 483                              GLsizei nameLen, const char *name)
 484 {
 485    GLuint i;
 486
 487    if (!paramList)
 488       return NULL;
 489
 490    if (nameLen == -1) {
 491       /* name is null-terminated */
 492       for (i = 0; i < paramList->NumParameters; i++) {
 493          if (_mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 494             return paramList->Parameters[i].Values;
 495       }
 496    }
 497    else {
 498       /* name is not null-terminated, use nameLen */
 499       for (i = 0; i < paramList->NumParameters; i++) {
 500          if (_mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 501              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 502             return paramList->Parameters[i].Values;
 503       }
 504    }
 505    return NULL;
 506 }
 507
 508
 509 /**
 510  * Lookup a parameter index by name in the given parameter list.
 511  * \return index of parameter in the list.
 512  */
 513 GLint
 514 _mesa_lookup_parameter_index(struct program_parameter_list *paramList,
 515                              GLsizei nameLen, const char *name)
 516 {
 517    GLint i;
 518
 519    if (!paramList)
 520       return -1;
 521
 522    if (nameLen == -1) {
 523       /* name is null-terminated */
 524       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 525          if (_mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 526             return i;
 527       }
 528    }
 529    else {
 530       /* name is not null-terminated, use nameLen */
 531       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 532          if (_mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 533              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 534             return i;
 535       }
 536    }
 537    return -1;
 538 }
 539
 540
 541 /**
 542  * Use the list of tokens in the state[] array to find global GL state
 543  * and return it in <value>.  Usually, four values are returned in <value>
 544  * but matrix queries may return as many as 16 values.
 545  * This function is used for ARB vertex/fragment programs.
 546  * The program parser will produce the state[] values.
 547  */
 548 static void
 549 _mesa_fetch_state(GLcontext *ctx, const enum state_index state[],
 550                   GLfloat *value)
 551 {
 552    switch (state[0]) {
 553    case STATE_MATERIAL:
 554       {
 555          /* state[1] is either 0=front or 1=back side */
 556          const GLuint face = (GLuint) state[1];
 557          /* state[2] is the material attribute */
 558          switch (state[2]) {
 559          case STATE_AMBIENT:
 560             if (face == 0)
 561                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT]);
 562             else
 563                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT]);
 564             return;
 565          case STATE_DIFFUSE:
 566             if (face == 0)
 567                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE]);
 568             else
 569                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE]);
 570             return;
 571          case STATE_SPECULAR:
 572             if (face == 0)
 573                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR]);
 574             else
 575                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SPECULAR]);
 576             return;
 577          case STATE_EMISSION:
 578             if (face == 0)
 579                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION]);
 580             else
 581                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION]);
 582             return;
 583          case STATE_SHININESS:
 584             if (face == 0)
 585                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SHININESS][0];
 586             else
 587                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SHININESS][0];
 588             value[1] = 0.0F;
 589             value[2] = 0.0F;
 590             value[3] = 1.0F;
 591             return;
 592          default:
 593             _mesa_problem(ctx, "Invalid material state in fetch_state");
 594             return;
 595          }
 596       }
 597    case STATE_LIGHT:
 598       {
 599          /* state[1] is the light number */
 600          const GLuint ln = (GLuint) state[1];
 601          /* state[2] is the light attribute */
 602          switch (state[2]) {
 603          case STATE_AMBIENT:
 604             COPY_4V(value, ctx->Light.Light[ln].Ambient);
 605             return;
 606          case STATE_DIFFUSE:
 607             COPY_4V(value, ctx->Light.Light[ln].Diffuse);
 608             return;
 609          case STATE_SPECULAR:
 610             COPY_4V(value, ctx->Light.Light[ln].Specular);
 611             return;
 612          case STATE_POSITION:
 613             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 614             return;
 615          case STATE_ATTENUATION:
 616             value[0] = ctx->Light.Light[ln].ConstantAttenuation;
 617             value[1] = ctx->Light.Light[ln].LinearAttenuation;
 618             value[2] = ctx->Light.Light[ln].QuadraticAttenuation;
 619             value[3] = ctx->Light.Light[ln].SpotExponent;
 620             return;
 621          case STATE_SPOT_DIRECTION:
 622             COPY_3V(value, ctx->Light.Light[ln].EyeDirection);
 623             value[3] = ctx->Light.Light[ln]._CosCutoff;
 624             return;
 625          case STATE_HALF:
 626             {
 627                GLfloat eye_z[] = {0, 0, 1};
 628
 629                /* Compute infinite half angle vector:
 630                 *   half-vector = light_position + (0, 0, 1)
 631                 * and then normalize.  w = 0
 632                                          *
 633                                          * light.EyePosition.w should be 0 for infinite lights.
 634                 */
 635                                         ADD_3V(value, eye_z, ctx->Light.Light[ln].EyePosition);
 636                                         NORMALIZE_3FV(value);
 637                                         value[3] = 0;
 638             }
 639             return;
 640          default:
 641             _mesa_problem(ctx, "Invalid light state in fetch_state");
 642             return;
 643          }
 644       }
 645    case STATE_LIGHTMODEL_AMBIENT:
 646       COPY_4V(value, ctx->Light.Model.Ambient);
 647       return;
 648    case STATE_LIGHTMODEL_SCENECOLOR:
 649       if (state[1] == 0) {
 650          /* front */
 651          GLint i;
 652          for (i = 0; i < 3; i++) {
 653             value[i] = ctx->Light.Model.Ambient[i]
 654                * ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT][i]
 655                + ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION][i];
 656          }
 657          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
 658       }
 659       else {
 660          /* back */
 661          GLint i;
 662          for (i = 0; i < 3; i++) {
 663             value[i] = ctx->Light.Model.Ambient[i]
 664                * ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT][i]
 665                + ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION][i];
 666          }
 667          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
 668       }
 669       return;
 670    case STATE_LIGHTPROD:
 671       {
 672          const GLuint ln = (GLuint) state[1];
 673          const GLuint face = (GLuint) state[2];
 674          GLint i;
 675          ASSERT(face == 0 || face == 1);
 676          switch (state[3]) {
 677             case STATE_AMBIENT:
 678                for (i = 0; i < 3; i++) {
 679                   value[i] = ctx->Light.Light[ln].Ambient[i] *
 680                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][i];
 681                }
 682                /* [3] = material alpha */
 683                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 684                return;
 685             case STATE_DIFFUSE:
 686                for (i = 0; i < 3; i++) {
 687                   value[i] = ctx->Light.Light[ln].Diffuse[i] *
 688                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][i];
 689                }
 690                /* [3] = material alpha */
 691                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 692                return;
 693             case STATE_SPECULAR:
 694                for (i = 0; i < 3; i++) {
 695                   value[i] = ctx->Light.Light[ln].Specular[i] *
 696                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][i];
 697                }
 698                /* [3] = material alpha */
 699                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 700                return;
 701             default:
 702                _mesa_problem(ctx, "Invalid lightprod state in fetch_state");
 703                return;
 704          }
 705       }
 706    case STATE_TEXGEN:
 707       {
 708          /* state[1] is the texture unit */
 709          const GLuint unit = (GLuint) state[1];
 710          /* state[2] is the texgen attribute */
 711          switch (state[2]) {
 712          case STATE_TEXGEN_EYE_S:
 713             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneS);
 714             return;
 715          case STATE_TEXGEN_EYE_T:
 716             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneT);
 717             return;
 718          case STATE_TEXGEN_EYE_R:
 719             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneR);
 720             return;
 721          case STATE_TEXGEN_EYE_Q:
 722             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneQ);
 723             return;
 724          case STATE_TEXGEN_OBJECT_S:
 725             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneS);
 726             return;
 727          case STATE_TEXGEN_OBJECT_T:
 728             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneT);
 729             return;
 730          case STATE_TEXGEN_OBJECT_R:
 731             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneR);
 732             return;
 733          case STATE_TEXGEN_OBJECT_Q:
 734             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneQ);
 735             return;
 736          default:
 737             _mesa_problem(ctx, "Invalid texgen state in fetch_state");
 738             return;
 739          }
 740       }
 741    case STATE_TEXENV_COLOR:
 742       {
 743          /* state[1] is the texture unit */
 744          const GLuint unit = (GLuint) state[1];
 745          COPY_4V(value, ctx->Texture.Unit[unit].EnvColor);
 746       }
 747       return;
 748    case STATE_FOG_COLOR:
 749       COPY_4V(value, ctx->Fog.Color);
 750       return;
 751    case STATE_FOG_PARAMS:
 752       value[0] = ctx->Fog.Density;
 753       value[1] = ctx->Fog.Start;
 754       value[2] = ctx->Fog.End;
 755       value[3] = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
 756       return;
 757    case STATE_CLIPPLANE:
 758       {
 759          const GLuint plane = (GLuint) state[1];
 760          COPY_4V(value, ctx->Transform.EyeUserPlane[plane]);
 761       }
 762       return;
 763    case STATE_POINT_SIZE:
 764       value[0] = ctx->Point.Size;
 765       value[1] = ctx->Point.MinSize;
 766       value[2] = ctx->Point.MaxSize;
 767       value[3] = ctx->Point.Threshold;
 768       return;
 769    case STATE_POINT_ATTENUATION:
 770       value[0] = ctx->Point.Params[0];
 771       value[1] = ctx->Point.Params[1];
 772       value[2] = ctx->Point.Params[2];
 773       value[3] = 1.0F;
 774       return;
 775    case STATE_MATRIX:
 776       {
 777          /* state[1] = modelview, projection, texture, etc. */
 778          /* state[2] = which texture matrix or program matrix */
 779          /* state[3] = first column to fetch */
 780          /* state[4] = last column to fetch */
 781          /* state[5] = transpose, inverse or invtrans */
 782
 783          const GLmatrix *matrix;
 784          const enum state_index mat = state[1];
 785          const GLuint index = (GLuint) state[2];
 786          const GLuint first = (GLuint) state[3];
 787          const GLuint last = (GLuint) state[4];
 788          const enum state_index modifier = state[5];
 789          const GLfloat *m;
 790          GLuint row, i;
 791          if (mat == STATE_MODELVIEW) {
 792             matrix = ctx->ModelviewMatrixStack.Top;
 793          }
 794          else if (mat == STATE_PROJECTION) {
 795             matrix = ctx->ProjectionMatrixStack.Top;
 796          }
 797          else if (mat == STATE_MVP) {
 798             matrix = &ctx->_ModelProjectMatrix;
 799          }
 800          else if (mat == STATE_TEXTURE) {
 801             matrix = ctx->TextureMatrixStack[index].Top;
 802          }
 803          else if (mat == STATE_PROGRAM) {
 804             matrix = ctx->ProgramMatrixStack[index].Top;
 805          }
 806          else {
 807             _mesa_problem(ctx, "Bad matrix name in _mesa_fetch_state()");
 808             return;
 809          }
 810          if (modifier == STATE_MATRIX_INVERSE ||
 811              modifier == STATE_MATRIX_INVTRANS) {
 812             /* Be sure inverse is up to date:
 813              */
 814             _math_matrix_analyse( (GLmatrix*) matrix );
 815             m = matrix->inv;
 816          }
 817          else {
 818             m = matrix->m;
 819          }
 820          if (modifier == STATE_MATRIX_TRANSPOSE ||
 821              modifier == STATE_MATRIX_INVTRANS) {
 822             for (i = 0, row = first; row <= last; row++) {
 823                value[i++] = m[row * 4 + 0];
 824                value[i++] = m[row * 4 + 1];
 825                value[i++] = m[row * 4 + 2];
 826                value[i++] = m[row * 4 + 3];
 827             }
 828          }
 829          else {
 830             for (i = 0, row = first; row <= last; row++) {
 831                value[i++] = m[row + 0];
 832                value[i++] = m[row + 4];
 833                value[i++] = m[row + 8];
 834                value[i++] = m[row + 12];
 835             }
 836          }
 837       }
 838       return;
 839    case STATE_DEPTH_RANGE:
 840       value[0] = ctx->Viewport.Near;                     /* near       */
 841       value[1] = ctx->Viewport.Far;                      /* far        */
 842       value[2] = ctx->Viewport.Far - ctx->Viewport.Near; /* far - near */
 843       value[3] = 0;
 844       return;
 845    case STATE_FRAGMENT_PROGRAM:
 846       {
 847          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 848          /* state[2] = parameter index          */
 849          const int idx = (int) state[2];
 850          switch (state[1]) {
 851             case STATE_ENV:
 852                COPY_4V(value, ctx->FragmentProgram.Parameters[idx]);
 853                break;
 854             case STATE_LOCAL:
 855                COPY_4V(value, ctx->FragmentProgram.Current->Base.LocalParams[idx]);
 856                break;
 857             default:
 858                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 859                return;
 860          }
 861       }
 862       return;
 863
 864    case STATE_VERTEX_PROGRAM:
 865       {
 866          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 867          /* state[2] = parameter index          */
 868          const int idx = (int) state[2];
 869          switch (state[1]) {
 870             case STATE_ENV:
 871                COPY_4V(value, ctx->VertexProgram.Parameters[idx]);
 872                break;
 873             case STATE_LOCAL:
 874                COPY_4V(value, ctx->VertexProgram.Current->Base.LocalParams[idx]);
 875                break;
 876             default:
 877                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 878                return;
 879          }
 880       }
 881       return;
 882    default:
 883       _mesa_problem(ctx, "Invalid state in _mesa_fetch_state");
 884       return;
 885    }
 886 }
 887
 888
 889 /**
 890  * Loop over all the parameters in a parameter list.  If the parameter
 891  * is a GL state reference, look up the current value of that state
 892  * variable and put it into the parameter's Value[4] array.
 893  * This would be called at glBegin time when using a fragment program.
 894  */
 895 void
 896 _mesa_load_state_parameters(GLcontext *ctx,
 897                             struct program_parameter_list *paramList)
 898 {
 899    GLuint i;
 900
 901    if (!paramList)
 902       return;
 903
 904    for (i = 0; i < paramList->NumParameters; i++) {
 905       if (paramList->Parameters[i].Type == STATE) {
 906          _mesa_fetch_state(ctx, paramList->Parameters[i].StateIndexes,
 907                            paramList->Parameters[i].Values);
 908       }
 909    }
 910 }
 911
 912
 913
 914 /**********************************************************************/
 915 /* API functions                                                      */
 916 /**********************************************************************/
 917
 918
 919 /**
 920  * Bind a program (make it current)
 921  * \note Called from the GL API dispatcher by both glBindProgramNV
 922  * and glBindProgramARB.
 923  */
 924 void GLAPIENTRY
 925 _mesa_BindProgram(GLenum target, GLuint id)
 926 {
 927    struct program *prog;
 928    GET_CURRENT_CONTEXT(ctx);
 929    ASSERT_OUTSIDE_BEGIN_END(ctx);
 930
 931    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 932
 933    if ((target == GL_VERTEX_PROGRAM_NV
 934         && ctx->Extensions.NV_vertex_program) ||
 935        (target == GL_VERTEX_PROGRAM_ARB
 936         && ctx->Extensions.ARB_vertex_program)) {
 937       /*** Vertex program binding ***/
 938       struct vertex_program *curProg = ctx->VertexProgram.Current;
 939       if (curProg->Base.Id == id) {
 940          /* binding same program - no change */
 941          return;
 942       }
 943       if (curProg->Base.Id != 0) {
 944          /* decrement refcount on previously bound vertex program */
 945          curProg->Base.RefCount--;
 946          /* and delete if refcount goes below one */
 947          if (curProg->Base.RefCount <= 0) {
 948             /* the program ID was already removed from the hash table */
 949             ctx->Driver.DeleteProgram(ctx, &(curProg->Base));
 950          }
 951       }
 952    }
 953    else if ((target == GL_FRAGMENT_PROGRAM_NV
 954              && ctx->Extensions.NV_fragment_program) ||
 955             (target == GL_FRAGMENT_PROGRAM_ARB
 956              && ctx->Extensions.ARB_fragment_program)) {
 957       /*** Fragment program binding ***/
 958       struct fragment_program *curProg = ctx->FragmentProgram.Current;
 959       if (curProg->Base.Id == id) {
 960          /* binding same program - no change */
 961          return;
 962       }
 963       if (curProg->Base.Id != 0) {
 964          /* decrement refcount on previously bound fragment program */
 965          curProg->Base.RefCount--;
 966          /* and delete if refcount goes below one */
 967          if (curProg->Base.RefCount <= 0) {
 968             /* the program ID was already removed from the hash table */
 969             ctx->Driver.DeleteProgram(ctx, &(curProg->Base));
 970          }
 971       }
 972    }
 973    else {
 974       _mesa_error(ctx, GL_INVALID_ENUM, "glBindProgramNV/ARB(target)");
 975       return;
 976    }
 977
 978    /* NOTE: binding to a non-existant program is not an error.
 979     * That's supposed to be caught in glBegin.
 980     */
 981    if (id == 0) {
 982       /* Bind default program */
 983       prog = NULL;
 984       if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB)
 985          prog = ctx->Shared->DefaultVertexProgram;
 986       else
 987          prog = ctx->Shared->DefaultFragmentProgram;
 988    }
 989    else {
 990       /* Bind user program */
 991       prog = (struct program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 992       if (!prog || prog == &_mesa_DummyProgram) {
 993          /* allocate a new program now */
 994          prog = ctx->Driver.NewProgram(ctx, target, id);
 995          if (!prog) {
 996             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindProgramNV/ARB");
 997             return;
 998          }
 999          _mesa_HashInsert(ctx->Shared->Programs, id, prog);
1000       }
1001       else if (prog->Target != target) {
1002          _mesa_error(ctx, GL_INVALID_OPERATION,
1003                      "glBindProgramNV/ARB(target mismatch)");
1004          return;
1005       }
1006    }
1007
1008    /* bind now */
1009    if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB) {
1010       ctx->VertexProgram.Current = (struct vertex_program *) prog;
1011    }
1012    else if (target == GL_FRAGMENT_PROGRAM_NV || target == GL_FRAGMENT_PROGRAM_ARB) {
1013       ctx->FragmentProgram.Current = (struct fragment_program *) prog;
1014    }
1015
1016    /* Never null pointers */
1017    ASSERT(ctx->VertexProgram.Current);
1018    ASSERT(ctx->FragmentProgram.Current);
1019
1020    if (prog)
1021       prog->RefCount++;
1022
1023    if (ctx->Driver.BindProgram)
1024       ctx->Driver.BindProgram(ctx, target, prog);
1025 }
1026
1027
1028 /**
1029  * Delete a list of programs.
1030  * \note Not compiled into display lists.
1031  * \note Called by both glDeleteProgramsNV and glDeleteProgramsARB.
1032  */
1033 void GLAPIENTRY
1034 _mesa_DeletePrograms(GLsizei n, const GLuint *ids)
1035 {
1036    GLint i;
1037    GET_CURRENT_CONTEXT(ctx);
1038    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
1039
1040    if (n < 0) {
1041       _mesa_error( ctx, GL_INVALID_VALUE, "glDeleteProgramsNV" );
1042       return;
1043    }
1044
1045    for (i = 0; i < n; i++) {
1046       if (ids[i] != 0) {
1047          struct program *prog = (struct program *)
1048             _mesa_HashLookup(ctx->Shared->Programs, ids[i]);
1049          if (prog == &_mesa_DummyProgram) {
1050             _mesa_HashRemove(ctx->Shared->Programs, ids[i]);
1051          }
1052          else if (prog) {
1053             /* Unbind program if necessary */
1054             if (prog->Target == GL_VERTEX_PROGRAM_NV ||
1055                 prog->Target == GL_VERTEX_STATE_PROGRAM_NV) {
1056                if (ctx->VertexProgram.Current &&
1057                    ctx->VertexProgram.Current->Base.Id == ids[i]) {
1058                   /* unbind this currently bound program */
1059                   _mesa_BindProgram(prog->Target, 0);
1060                }
1061             }
1062             else if (prog->Target == GL_FRAGMENT_PROGRAM_NV ||
1063                      prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
1064                if (ctx->FragmentProgram.Current &&
1065                    ctx->FragmentProgram.Current->Base.Id == ids[i]) {
1066                   /* unbind this currently bound program */
1067                   _mesa_BindProgram(prog->Target, 0);
1068                }
1069             }
1070             else {
1071                _mesa_problem(ctx, "bad target in glDeleteProgramsNV");
1072                return;
1073             }
1074             /* The ID is immediately available for re-use now */
1075             _mesa_HashRemove(ctx->Shared->Programs, ids[i]);
1076             prog->RefCount--;
1077             if (prog->RefCount <= 0) {
1078                ctx->Driver.DeleteProgram(ctx, prog);
1079             }
1080          }
1081       }
1082    }
1083 }
1084
1085
1086 /**
1087  * Generate a list of new program identifiers.
1088  * \note Not compiled into display lists.
1089  * \note Called by both glGenProgramsNV and glGenProgramsARB.
1090  */
1091 void GLAPIENTRY
1092 _mesa_GenPrograms(GLsizei n, GLuint *ids)
1093 {
1094    GLuint first;
1095    GLuint i;
1096    GET_CURRENT_CONTEXT(ctx);
1097    ASSERT_OUTSIDE_BEGIN_END(ctx);
1098
1099    if (n < 0) {
1100       _mesa_error(ctx, GL_INVALID_VALUE, "glGenPrograms");
1101       return;
1102    }
1103
1104    if (!ids)
1105       return;
1106
1107    first = _mesa_HashFindFreeKeyBlock(ctx->Shared->Programs, n);
1108
1109    /* Insert pointer to dummy program as placeholder */
1110    for (i = 0; i < (GLuint) n; i++) {
1111       _mesa_HashInsert(ctx->Shared->Programs, first + i, &_mesa_DummyProgram);
1112    }
1113
1114    /* Return the program names */
1115    for (i = 0; i < (GLuint) n; i++) {
1116       ids[i] = first + i;
1117    }
1118 }
1119
1120
1121 /**
1122  * Determine if id names a vertex or fragment program.
1123  * \note Not compiled into display lists.
1124  * \note Called from both glIsProgramNV and glIsProgramARB.
1125  * \param id is the program identifier
1126  * \return GL_TRUE if id is a program, else GL_FALSE.
1127  */
1128 GLboolean GLAPIENTRY
1129 _mesa_IsProgram(GLuint id)
1130 {
1131    GET_CURRENT_CONTEXT(ctx);
1132    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
1133
1134    if (id == 0)
1135       return GL_FALSE;
1136
1137    if (_mesa_HashLookup(ctx->Shared->Programs, id))
1138       return GL_TRUE;
1139    else
1140       return GL_FALSE;
1141 }
1142
1143
1144
1145 /**********************************************************************/
1146 /* GL_MESA_program_debug extension                                    */
1147 /**********************************************************************/
1148
1149
1150 /* XXX temporary */
1151 GLAPI void GLAPIENTRY
1152 glProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
1153                       GLvoid *data)
1154 {
1155    _mesa_ProgramCallbackMESA(target, callback, data);
1156 }
1157
1158
1159 void
1160 _mesa_ProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
1161                           GLvoid *data)
1162 {
1163    GET_CURRENT_CONTEXT(ctx);
1164
1165    switch (target) {
1166       case GL_FRAGMENT_PROGRAM_ARB:
1167          if (!ctx->Extensions.ARB_fragment_program) {
1168             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1169             return;
1170          }
1171          ctx->FragmentProgram.Callback = callback;
1172          ctx->FragmentProgram.CallbackData = data;
1173          break;
1174       case GL_FRAGMENT_PROGRAM_NV:
1175          if (!ctx->Extensions.NV_fragment_program) {
1176             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1177             return;
1178          }
1179          ctx->FragmentProgram.Callback = callback;
1180          ctx->FragmentProgram.CallbackData = data;
1181          break;
1182       case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
1183          if (!ctx->Extensions.ARB_vertex_program &&
1184              !ctx->Extensions.NV_vertex_program) {
1185             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1186             return;
1187          }
1188          ctx->VertexProgram.Callback = callback;
1189          ctx->VertexProgram.CallbackData = data;
1190          break;
1191       default:
1192          _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1193          return;
1194    }
1195 }
1196
1197
1198 /* XXX temporary */
1199 GLAPI void GLAPIENTRY
1200 glGetProgramRegisterfvMESA(GLenum target,
1201                            GLsizei len, const GLubyte *registerName,
1202                            GLfloat *v)
1203 {
1204    _mesa_GetProgramRegisterfvMESA(target, len, registerName, v);
1205 }
1206
1207
1208 void
1209 _mesa_GetProgramRegisterfvMESA(GLenum target,
1210                                GLsizei len, const GLubyte *registerName,
1211                                GLfloat *v)
1212 {
1213    char reg[1000];
1214    GET_CURRENT_CONTEXT(ctx);
1215
1216    /* We _should_ be inside glBegin/glEnd */
1217 #if 0
1218    if (ctx->Driver.CurrentExecPrimitive == PRIM_OUTSIDE_BEGIN_END) {
1219       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetProgramRegisterfvMESA");
1220       return;
1221    }
1222 #endif
1223
1224    /* make null-terminated copy of registerName */
1225    len = MIN2((unsigned int) len, sizeof(reg) - 1);
1226    _mesa_memcpy(reg, registerName, len);
1227    reg[len] = 0;
1228
1229    switch (target) {
1230       case GL_VERTEX_PROGRAM_NV:
1231          if (!ctx->Extensions.ARB_vertex_program &&
1232              !ctx->Extensions.NV_vertex_program) {
1233             _mesa_error(ctx, GL_INVALID_ENUM,
1234                         "glGetProgramRegisterfvMESA(target)");
1235             return;
1236          }
1237          if (!ctx->VertexProgram._Enabled) {
1238             _mesa_error(ctx, GL_INVALID_OPERATION,
1239                         "glGetProgramRegisterfvMESA");
1240             return;
1241          }
1242          /* GL_NV_vertex_program */
1243          if (reg[0] == 'R') {
1244             /* Temp register */
1245             GLint i = _mesa_atoi(reg + 1);
1246             if (i >= (GLint)ctx->Const.MaxVertexProgramTemps) {
1247                _mesa_error(ctx, GL_INVALID_VALUE,
1248                            "glGetProgramRegisterfvMESA(registerName)");
1249                return;
1250             }
1251             COPY_4V(v, ctx->VertexProgram.Temporaries[i]);
1252          }
1253          else if (reg[0] == 'v' && reg[1] == '[') {
1254             /* Vertex Input attribute */
1255             GLuint i;
1256             for (i = 0; i < ctx->Const.MaxVertexProgramAttribs; i++) {
1257                const char *name = _mesa_nv_vertex_input_register_name(i);
1258                char number[10];
1259                sprintf(number, "%d", i);
1260                if (_mesa_strncmp(reg + 2, name, 4) == 0 ||
1261                    _mesa_strncmp(reg + 2, number, _mesa_strlen(number)) == 0) {
1262                   COPY_4V(v, ctx->VertexProgram.Inputs[i]);
1263                   return;
1264                }
1265             }
1266             _mesa_error(ctx, GL_INVALID_VALUE,
1267                         "glGetProgramRegisterfvMESA(registerName)");
1268             return;
1269          }
1270          else if (reg[0] == 'o' && reg[1] == '[') {
1271             /* Vertex output attribute */
1272          }
1273          /* GL_ARB_vertex_program */
1274          else if (_mesa_strncmp(reg, "vertex.", 7) == 0) {
1275
1276          }
1277          else {
1278             _mesa_error(ctx, GL_INVALID_VALUE,
1279                         "glGetProgramRegisterfvMESA(registerName)");
1280             return;
1281          }
1282          break;
1283       case GL_FRAGMENT_PROGRAM_ARB:
1284          if (!ctx->Extensions.ARB_fragment_program) {
1285             _mesa_error(ctx, GL_INVALID_ENUM,
1286                         "glGetProgramRegisterfvMESA(target)");
1287             return;
1288          }
1289          if (!ctx->FragmentProgram._Enabled) {
1290             _mesa_error(ctx, GL_INVALID_OPERATION,
1291                         "glGetProgramRegisterfvMESA");
1292             return;
1293          }
1294          /* XXX to do */
1295          break;
1296       case GL_FRAGMENT_PROGRAM_NV:
1297          if (!ctx->Extensions.NV_fragment_program) {
1298             _mesa_error(ctx, GL_INVALID_ENUM,
1299                         "glGetProgramRegisterfvMESA(target)");
1300             return;
1301          }
1302          if (!ctx->FragmentProgram._Enabled) {
1303             _mesa_error(ctx, GL_INVALID_OPERATION,
1304                         "glGetProgramRegisterfvMESA");
1305             return;
1306          }
1307          if (reg[0] == 'R') {
1308             /* Temp register */
1309             GLint i = _mesa_atoi(reg + 1);
1310             if (i >= (GLint)ctx->Const.MaxFragmentProgramTemps) {
1311                _mesa_error(ctx, GL_INVALID_VALUE,
1312                            "glGetProgramRegisterfvMESA(registerName)");
1313                return;
1314             }
1315             COPY_4V(v, ctx->FragmentProgram.Machine.Temporaries[i]);
1316          }
1317          else if (reg[0] == 'f' && reg[1] == '[') {
1318             /* Fragment input attribute */
1319             GLuint i;
1320             for (i = 0; i < ctx->Const.MaxFragmentProgramAttribs; i++) {
1321                const char *name = _mesa_nv_fragment_input_register_name(i);
1322                if (_mesa_strncmp(reg + 2, name, 4) == 0) {
1323                   COPY_4V(v, ctx->FragmentProgram.Machine.Inputs[i]);
1324                   return;
1325                }
1326             }
1327             _mesa_error(ctx, GL_INVALID_VALUE,
1328                         "glGetProgramRegisterfvMESA(registerName)");
1329             return;
1330          }
1331          else if (_mesa_strcmp(reg, "o[COLR]") == 0) {
1332             /* Fragment output color */
1333             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLR]);
1334          }
1335          else if (_mesa_strcmp(reg, "o[COLH]") == 0) {
1336             /* Fragment output color */
1337             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLH]);
1338          }
1339          else if (_mesa_strcmp(reg, "o[DEPR]") == 0) {
1340             /* Fragment output depth */
1341             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_DEPR]);
1342          }
1343          else {
1344             /* try user-defined identifiers */
1345             const GLfloat *value = _mesa_lookup_parameter_value(
1346                        ctx->FragmentProgram.Current->Parameters, -1, reg);
1347             if (value) {
1348                COPY_4V(v, value);
1349             }
1350             else {
1351                _mesa_error(ctx, GL_INVALID_VALUE,
1352                            "glGetProgramRegisterfvMESA(registerName)");
1353                return;
1354             }
1355          }
1356          break;
1357       default:
1358          _mesa_error(ctx, GL_INVALID_ENUM,
1359                      "glGetProgramRegisterfvMESA(target)");
1360          return;
1361    }
1362
1363 }