src/mesa/main/program.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  5.1
   4  *
   5  * Copyright (C) 1999-2003  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
  43
  44 /**********************************************************************/
  45 /* Utility functions                                                  */
  46 /**********************************************************************/
  47
  48
  49 /**
  50  * Init context's program state
  51  */
  52 void
  53 _mesa_init_program(GLcontext *ctx)
  54 {
  55    GLuint i;
  56
  57    ctx->Program.ErrorPos = -1;
  58    ctx->Program.ErrorString = _mesa_strdup("");
  59
  60 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
  61    ctx->VertexProgram.Enabled = GL_FALSE;
  62    ctx->VertexProgram.PointSizeEnabled = GL_FALSE;
  63    ctx->VertexProgram.TwoSideEnabled = GL_FALSE;
  64    ctx->VertexProgram.Current = NULL;
  65    ctx->VertexProgram.Current = (struct vertex_program *) ctx->Shared->DefaultVertexProgram;
  66    assert(ctx->VertexProgram.Current);
  67    ctx->VertexProgram.Current->Base.RefCount++;
  68    for (i = 0; i < MAX_NV_VERTEX_PROGRAM_PARAMS / 4; i++) {
  69       ctx->VertexProgram.TrackMatrix[i] = GL_NONE;
  70       ctx->VertexProgram.TrackMatrixTransform[i] = GL_IDENTITY_NV;
  71    }
  72 #endif
  73
  74 #if FEATURE_NV_fragment_program || FEATURE_ARB_fragment_program
  75    ctx->FragmentProgram.Enabled = GL_FALSE;
  76    ctx->FragmentProgram.Current = (struct fragment_program *) ctx->Shared->DefaultFragmentProgram;
  77    assert(ctx->FragmentProgram.Current);
  78    ctx->FragmentProgram.Current->Base.RefCount++;
  79 #endif
  80 }
  81
  82
  83 /**
  84  * Set the vertex/fragment program error state (position and error string).
  85  * This is generally called from within the parsers.
  86  */
  87 void
  88 _mesa_set_program_error(GLcontext *ctx, GLint pos, const char *string)
  89 {
  90    ctx->Program.ErrorPos = pos;
  91    _mesa_free((void *) ctx->Program.ErrorString);
  92    if (!string)
  93       string = "";
  94    ctx->Program.ErrorString = _mesa_strdup(string);
  95 }
  96
  97
  98 /**
  99  * Find the line number and column for 'pos' within 'string'.
 100  * Return a copy of the line which contains 'pos'.  Free the line with
 101  * _mesa_free().
 102  * \param string  the program string
 103  * \param pos     the position within the string
 104  * \param line    returns the line number corresponding to 'pos'.
 105  * \param col     returns the column number corresponding to 'pos'.
 106  * \return copy of the line containing 'pos'.
 107  */
 108 const GLubyte *
 109 _mesa_find_line_column(const GLubyte *string, const GLubyte *pos,
 110                        GLint *line, GLint *col)
 111 {
 112    const GLubyte *lineStart = string;
 113    const GLubyte *p = string;
 114    GLubyte *s;
 115    int len;
 116
 117    *line = 1;
 118
 119    while (p != pos) {
 120       if (*p == (GLubyte) '\n') {
 121          (*line)++;
 122          lineStart = p + 1;
 123       }
 124       p++;
 125    }
 126
 127    *col = (pos - lineStart) + 1;
 128
 129    /* return copy of this line */
 130    while (*p != 0 && *p != '\n')
 131       p++;
 132    len = p - lineStart;
 133    s = (GLubyte *) _mesa_malloc(len + 1);
 134    _mesa_memcpy(s, lineStart, len);
 135    s[len] = 0;
 136
 137    return s;
 138 }
 139
 140
 141
 142 /**
 143  * Allocate and initialize a new fragment/vertex program object
 144  * \param ctx  context
 145  * \param id   program id/number
 146  * \param target  program target/type
 147  * \return  pointer to new program object
 148  */
 149 struct program *
 150 _mesa_alloc_program(GLcontext *ctx, GLenum target, GLuint id)
 151 {
 152    struct program *prog;
 153
 154    if (target == GL_VERTEX_PROGRAM_NV
 155        || target == GL_VERTEX_PROGRAM_ARB) {
 156       struct vertex_program *vprog = CALLOC_STRUCT(vertex_program);
 157       if (!vprog) {
 158          return NULL;
 159       }
 160       prog = &(vprog->Base);
 161    }
 162    else if (target == GL_FRAGMENT_PROGRAM_NV
 163             || target == GL_FRAGMENT_PROGRAM_ARB) {
 164       struct fragment_program *fprog = CALLOC_STRUCT(fragment_program);
 165       if (!fprog) {
 166          return NULL;
 167       }
 168       prog = &(fprog->Base);
 169    }
 170    else {
 171       _mesa_problem(ctx, "bad target in _mesa_alloc_program");
 172       return NULL;
 173    }
 174    prog->Id = id;
 175    prog->Target = target;
 176    prog->Resident = GL_TRUE;
 177    prog->RefCount = 1;
 178    return prog;
 179 }
 180
 181
 182 /**
 183  * Delete a program and remove it from the hash table, ignoring the
 184  * reference count.
 185  * \note Called from the GL API dispatcher.
 186  */
 187 void
 188 _mesa_delete_program(GLcontext *ctx, struct program *prog)
 189 {
 190    ASSERT(prog);
 191
 192    if (prog->String)
 193       _mesa_free(prog->String);
 194    if (prog->Target == GL_VERTEX_PROGRAM_NV ||
 195        prog->Target == GL_VERTEX_STATE_PROGRAM_NV) {
 196       struct vertex_program *vprog = (struct vertex_program *) prog;
 197       if (vprog->Instructions)
 198          _mesa_free(vprog->Instructions);
 199    }
 200    else if (prog->Target == GL_FRAGMENT_PROGRAM_NV) {
 201       struct fragment_program *fprog = (struct fragment_program *) prog;
 202       if (fprog->Instructions)
 203          _mesa_free(fprog->Instructions);
 204       if (fprog->Parameters) {
 205          _mesa_free_parameter_list(fprog->Parameters);
 206       }
 207    }
 208    _mesa_free(prog);
 209 }
 210
 211
 212
 213 /**********************************************************************/
 214 /* Program parameter functions                                        */
 215 /**********************************************************************/
 216
 217 struct program_parameter_list *
 218 _mesa_new_parameter_list(void)
 219 {
 220    return (struct program_parameter_list *)
 221       _mesa_calloc(sizeof(struct program_parameter_list));
 222 }
 223
 224
 225 /**
 226  * Free a parameter list and all its parameters
 227  */
 228 void
 229 _mesa_free_parameter_list(struct program_parameter_list *paramList)
 230 {
 231    _mesa_free_parameters(paramList);
 232    _mesa_free(paramList);
 233 }
 234
 235
 236 /**
 237  * Free all the parameters in the given list, but don't free the
 238  * paramList structure itself.
 239  */
 240 void
 241 _mesa_free_parameters(struct program_parameter_list *paramList)
 242 {
 243    GLuint i;
 244    for (i = 0; i < paramList->NumParameters; i++) {
 245       _mesa_free((void *) paramList->Parameters[i].Name);
 246    }
 247    _mesa_free(paramList->Parameters);
 248    paramList->NumParameters = 0;
 249    paramList->Parameters = NULL;
 250 }
 251
 252
 253 /**
 254  * Helper function used by the functions below.
 255  */
 256 static GLint
 257 add_parameter(struct program_parameter_list *paramList,
 258               const char *name, const GLfloat values[4],
 259               enum parameter_type type)
 260 {
 261    const GLuint n = paramList->NumParameters;
 262
 263    paramList->Parameters = (struct program_parameter *)
 264       _mesa_realloc(paramList->Parameters,
 265                     n * sizeof(struct program_parameter),
 266                     (n + 1) * sizeof(struct program_parameter));
 267    if (!paramList->Parameters) {
 268       /* out of memory */
 269       paramList->NumParameters = 0;
 270       return -1;
 271    }
 272    else {
 273       paramList->NumParameters = n + 1;
 274       paramList->Parameters[n].Name = _mesa_strdup(name);
 275       paramList->Parameters[n].Type = type;
 276       if (values)
 277          COPY_4V(paramList->Parameters[n].Values, values);
 278       return (GLint) n;
 279    }
 280 }
 281
 282
 283 /**
 284  * Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
 285  * \return index of the new entry in the parameter list
 286  */
 287 GLint
 288 _mesa_add_named_parameter(struct program_parameter_list *paramList,
 289                           const char *name, const GLfloat values[4])
 290 {
 291    return add_parameter(paramList, name, values, NAMED_PARAMETER);
 292 }
 293
 294
 295 /**
 296  * Add a new unnamed constant to the parameter list.
 297  * \param paramList - the parameter list
 298  * \param values - four float values
 299  * \return index of the new parameter.
 300  */
 301 GLint
 302 _mesa_add_named_constant(struct program_parameter_list *paramList,
 303                          const char *name, const GLfloat values[4])
 304 {
 305    return add_parameter(paramList, name, values, CONSTANT);
 306 }
 307
 308
 309 /**
 310  * Add a new unnamed constant to the parameter list.
 311  * \param paramList - the parameter list
 312  * \param values - four float values
 313  * \return index of the new parameter.
 314  */
 315 GLint
 316 _mesa_add_unnamed_constant(struct program_parameter_list *paramList,
 317                            const GLfloat values[4])
 318 {
 319    /* generate a new dummy name */
 320    static GLuint n = 0;
 321    char name[20];
 322    _mesa_sprintf(name, "constant%d", n);
 323    n++;
 324    /* store it */
 325    return add_parameter(paramList, name, values, CONSTANT);
 326 }
 327
 328
 329 /**
 330  * Add a new state reference to the parameter list.
 331  * \param paramList - the parameter list
 332  * \param state     - an array of 6 state tokens
 333  *
 334  * \return index of the new parameter.
 335  */
 336 GLint
 337 _mesa_add_state_reference(struct program_parameter_list *paramList,
 338                           GLint *stateTokens)
 339 {
 340    /* XXX Should we parse <stateString> here and produce the parameter's
 341     * list of STATE_* tokens here, or in the parser?
 342     */
 343    GLint a, idx;
 344
 345    idx = add_parameter(paramList, "Some State", NULL, STATE);
 346
 347    for (a=0; a<6; a++)
 348       paramList->Parameters[idx].StateIndexes[a] = stateTokens[a];
 349
 350    return idx;
 351 }
 352
 353
 354 /**
 355  * Lookup a parameter value by name in the given parameter list.
 356  * \return pointer to the float[4] values.
 357  */
 358 GLfloat *
 359 _mesa_lookup_parameter_value(struct program_parameter_list *paramList,
 360                              GLsizei nameLen, const char *name)
 361 {
 362    GLuint i;
 363
 364    if (nameLen == -1) {
 365       /* name is null-terminated */
 366       for (i = 0; i < paramList->NumParameters; i++) {
 367          if (_mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 368             return paramList->Parameters[i].Values;
 369       }
 370    }
 371    else {
 372       /* name is not null-terminated, use nameLen */
 373       for (i = 0; i < paramList->NumParameters; i++) {
 374          if (_mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 375              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 376             return paramList->Parameters[i].Values;
 377       }
 378    }
 379    return NULL;
 380 }
 381
 382
 383 /**
 384  * Lookup a parameter index by name in the given parameter list.
 385  * \return index of parameter in the list.
 386  */
 387 GLint
 388 _mesa_lookup_parameter_index(struct program_parameter_list *paramList,
 389                              GLsizei nameLen, const char *name)
 390 {
 391    GLint i;
 392
 393    if (nameLen == -1) {
 394       /* name is null-terminated */
 395       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 396          if (_mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 397             return i;
 398       }
 399    }
 400    else {
 401       /* name is not null-terminated, use nameLen */
 402       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 403          if (_mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 404              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 405             return i;
 406       }
 407    }
 408    return -1;
 409 }
 410
 411
 412 /**
 413  * Use the list of tokens in the state[] array to find global GL state
 414  * and return it in <value>.  Usually, four values are returned in <value>
 415  * but matrix queries may return as many as 16 values.
 416  * This function is used for ARB vertex/fragment programs.
 417  * The program parser will produce the state[] values.
 418  */
 419 static void
 420 _mesa_fetch_state(GLcontext *ctx, const enum state_index state[],
 421                   GLfloat *value)
 422 {
 423    switch (state[0]) {
 424    case STATE_MATERIAL:
 425       {
 426          /* state[1] is either 0=front or 1=back side */
 427          const GLuint face = (GLuint) state[1];
 428          /* state[2] is the material attribute */
 429          switch (state[2]) {
 430          case STATE_AMBIENT:
 431             if (face == 0)
 432                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT]);
 433             else
 434                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT]);
 435             return;
 436          case STATE_DIFFUSE:
 437             if (face == 0)
 438                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE]);
 439             else
 440                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE]);
 441             return;
 442          case STATE_SPECULAR:
 443             if (face == 0)
 444                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR]);
 445             else
 446                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SPECULAR]);
 447             return;
 448          case STATE_EMISSION:
 449             if (face == 0)
 450                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION]);
 451             else
 452                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION]);
 453             return;
 454          case STATE_SHININESS:
 455             if (face == 0)
 456                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SHININESS][0];
 457             else
 458                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SHININESS][0];
 459             value[1] = 0.0F;
 460             value[2] = 0.0F;
 461             value[3] = 1.0F;
 462             return;
 463          default:
 464             _mesa_problem(ctx, "Invalid material state in fetch_state");
 465             return;
 466          }
 467       };
 468       return;
 469    case STATE_LIGHT:
 470       {
 471          /* state[1] is the light number */
 472          const GLuint ln = (GLuint) state[1];
 473          /* state[2] is the light attribute */
 474          switch (state[2]) {
 475          case STATE_AMBIENT:
 476             COPY_4V(value, ctx->Light.Light[ln].Ambient);
 477             return;
 478          case STATE_DIFFUSE:
 479             COPY_4V(value, ctx->Light.Light[ln].Diffuse);
 480             return;
 481          case STATE_SPECULAR:
 482             COPY_4V(value, ctx->Light.Light[ln].Specular);
 483             return;
 484          case STATE_POSITION:
 485             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 486             return;
 487          case STATE_ATTENUATION:
 488             value[0] = ctx->Light.Light[ln].ConstantAttenuation;
 489             value[1] = ctx->Light.Light[ln].LinearAttenuation;
 490             value[2] = ctx->Light.Light[ln].QuadraticAttenuation;
 491             value[3] = ctx->Light.Light[ln].SpotExponent;
 492             return;
 493          case STATE_SPOT_DIRECTION:
 494             COPY_4V(value, ctx->Light.Light[ln].EyeDirection);
 495             return;
 496          case STATE_HALF:
 497             {
 498                GLfloat eye_z[] = {0, 0, 1};
 499
 500                /* Compute infinite half angle vector:
 501                 *   half-vector = light_position + (0, 0, 1)
 502                 * and then normalize.  w = 0
 503                                          *
 504                                          * light.EyePosition.w should be 0 for infinite lights.
 505                 */
 506                                         ADD_3V(value, eye_z, ctx->Light.Light[ln].EyePosition);
 507                                         NORMALIZE_3FV(value);
 508                                         value[3] = 0;
 509             }
 510             return;
 511          default:
 512             _mesa_problem(ctx, "Invalid light state in fetch_state");
 513             return;
 514          }
 515       }
 516       return;
 517    case STATE_LIGHTMODEL_AMBIENT:
 518       COPY_4V(value, ctx->Light.Model.Ambient);
 519       return;
 520    case STATE_LIGHTMODEL_SCENECOLOR:
 521       if (state[1] == 0) {
 522          /* front */
 523          GLint i;
 524          for (i = 0; i < 4; i++) {
 525             value[i] = ctx->Light.Model.Ambient[i]
 526                * ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT][i]
 527                + ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION][i];
 528          }
 529       }
 530       else {
 531          /* back */
 532          GLint i;
 533          for (i = 0; i < 4; i++) {
 534             value[i] = ctx->Light.Model.Ambient[i]
 535                * ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT][i]
 536                + ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION][i];
 537          }
 538       }
 539       return;
 540    case STATE_LIGHTPROD:
 541       {
 542          const GLuint ln = (GLuint) state[1];
 543          const GLuint face = (GLuint) state[2];
 544          GLint i;
 545          ASSERT(face == 0 || face == 1);
 546          switch (state[3]) {
 547             case STATE_AMBIENT:
 548                for (i = 0; i < 3; i++) {
 549                   value[i] = ctx->Light.Light[ln].Ambient[i] *
 550                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][i];
 551                }
 552                /* [3] = material alpha */
 553                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 554                return;
 555             case STATE_DIFFUSE:
 556                for (i = 0; i < 3; i++) {
 557                   value[i] = ctx->Light.Light[ln].Diffuse[i] *
 558                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][i];
 559                }
 560                /* [3] = material alpha */
 561                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 562                return;
 563             case STATE_SPECULAR:
 564                for (i = 0; i < 3; i++) {
 565                   value[i] = ctx->Light.Light[ln].Specular[i] *
 566                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][i];
 567                }
 568                /* [3] = material alpha */
 569                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 570                return;
 571             default:
 572                _mesa_problem(ctx, "Invalid lightprod state in fetch_state");
 573                return;
 574          }
 575       }
 576       return;
 577    case STATE_TEXGEN:
 578       {
 579          /* state[1] is the texture unit */
 580          const GLuint unit = (GLuint) state[1];
 581          /* state[2] is the texgen attribute */
 582          switch (state[2]) {
 583          case STATE_TEXGEN_EYE_S:
 584             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneS);
 585             return;
 586          case STATE_TEXGEN_EYE_T:
 587             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneT);
 588             return;
 589          case STATE_TEXGEN_EYE_R:
 590             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneR);
 591             return;
 592          case STATE_TEXGEN_EYE_Q:
 593             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneQ);
 594             return;
 595          case STATE_TEXGEN_OBJECT_S:
 596             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneS);
 597             return;
 598          case STATE_TEXGEN_OBJECT_T:
 599             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneT);
 600             return;
 601          case STATE_TEXGEN_OBJECT_R:
 602             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneR);
 603             return;
 604          case STATE_TEXGEN_OBJECT_Q:
 605             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneQ);
 606             return;
 607          default:
 608             _mesa_problem(ctx, "Invalid texgen state in fetch_state");
 609             return;
 610          }
 611       }
 612       return;
 613    case STATE_TEXENV_COLOR:
 614       {
 615          /* state[1] is the texture unit */
 616          const GLuint unit = (GLuint) state[1];
 617          COPY_4V(value, ctx->Texture.Unit[unit].EnvColor);
 618       }
 619       return;
 620    case STATE_FOG_COLOR:
 621       COPY_4V(value, ctx->Fog.Color);
 622       return;
 623    case STATE_FOG_PARAMS:
 624       value[0] = ctx->Fog.Density;
 625       value[1] = ctx->Fog.Start;
 626       value[2] = ctx->Fog.End;
 627       value[3] = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
 628       return;
 629    case STATE_CLIPPLANE:
 630       {
 631          const GLuint plane = (GLuint) state[1];
 632          COPY_4V(value, ctx->Transform.EyeUserPlane[plane]);
 633       }
 634       return;
 635    case STATE_POINT_SIZE:
 636       value[0] = ctx->Point.Size;
 637       value[1] = ctx->Point.MinSize;
 638       value[2] = ctx->Point.MaxSize;
 639       value[3] = ctx->Point.Threshold;
 640       return;
 641    case STATE_POINT_ATTENUATION:
 642       value[0] = ctx->Point.Params[0];
 643       value[1] = ctx->Point.Params[1];
 644       value[2] = ctx->Point.Params[2];
 645       value[3] = 1.0F;
 646       return;
 647    case STATE_MATRIX:
 648       {
 649          /* state[1] = modelview, projection, texture, etc. */
 650          /* state[2] = which texture matrix or program matrix */
 651          /* state[3] = first column to fetch */
 652          /* state[4] = last column to fetch */
 653          /* state[5] = transpose, inverse or invtrans */
 654
 655          const GLmatrix *matrix;
 656          const enum state_index mat = state[1];
 657          const GLuint index = (GLuint) state[2];
 658          const GLuint first = (GLuint) state[3];
 659          const GLuint last = (GLuint) state[4];
 660          const enum state_index modifier = state[5];
 661          const GLfloat *m;
 662          GLuint row, i;
 663          if (mat == STATE_MODELVIEW) {
 664             matrix = ctx->ModelviewMatrixStack.Top;
 665          }
 666          else if (mat == STATE_PROJECTION) {
 667             matrix = ctx->ProjectionMatrixStack.Top;
 668          }
 669          else if (mat == STATE_MVP) {
 670             matrix = &ctx->_ModelProjectMatrix;
 671          }
 672          else if (mat == STATE_TEXTURE) {
 673             matrix = ctx->TextureMatrixStack[index].Top;
 674          }
 675          else if (mat == STATE_PROGRAM) {
 676             matrix = ctx->ProgramMatrixStack[index].Top;
 677          }
 678          else {
 679             _mesa_problem(ctx, "Bad matrix name in _mesa_fetch_state()");
 680             return;
 681          }
 682          if (modifier == STATE_MATRIX_INVERSE ||
 683              modifier == STATE_MATRIX_INVTRANS) {
 684             /* XXX be sure inverse is up to date */
 685             m = matrix->inv;
 686          }
 687          else {
 688             m = matrix->m;
 689          }
 690          if (modifier == STATE_MATRIX_TRANSPOSE ||
 691              modifier == STATE_MATRIX_INVTRANS) {
 692             for (i = 0, row = first; row <= last; row++) {
 693                value[i++] = m[row * 4 + 0];
 694                value[i++] = m[row * 4 + 1];
 695                value[i++] = m[row * 4 + 2];
 696                value[i++] = m[row * 4 + 3];
 697             }
 698          }
 699          else {
 700             for (i = 0, row = first; row <= last; row++) {
 701                value[i++] = m[row + 0];
 702                value[i++] = m[row + 4];
 703                value[i++] = m[row + 8];
 704                value[i++] = m[row + 12];
 705             }
 706          }
 707       }
 708       return;
 709    case STATE_DEPTH_RANGE:
 710       value[0] = ctx->Viewport.Near;                     /* near       */
 711       value[1] = ctx->Viewport.Far;                      /* far        */
 712       value[2] = ctx->Viewport.Far - ctx->Viewport.Near; /* far - near */
 713       value[3] = 0;
 714       return;
 715    case STATE_FRAGMENT_PROGRAM:
 716       {
 717          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 718          /* state[2] = parameter index          */
 719          int idx = state[2];
 720
 721          switch (state[1]) {
 722             case STATE_ENV:
 723                COPY_4V(value, ctx->FragmentProgram.Parameters[idx]);
 724                break;
 725
 726             case STATE_LOCAL:
 727                COPY_4V(value, ctx->FragmentProgram.Current->Base.LocalParams[idx]);
 728                break;
 729             default:
 730                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 731                return;
 732          }
 733       }
 734       return;
 735
 736    case STATE_VERTEX_PROGRAM:
 737       {
 738          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 739          /* state[2] = parameter index          */
 740          int idx = state[2];
 741
 742          switch (state[1]) {
 743             case STATE_ENV:
 744                COPY_4V(value, ctx->VertexProgram.Parameters[idx]);
 745                break;
 746
 747             case STATE_LOCAL:
 748                COPY_4V(value, ctx->VertexProgram.Current->Base.LocalParams[idx]);
 749                break;
 750             default:
 751                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 752                return;
 753          }
 754       }
 755       return;
 756    default:
 757       _mesa_problem(ctx, "Invalid state in fetch_state");
 758       return;
 759    }
 760 }
 761
 762
 763 /**
 764  * Loop over all the parameters in a parameter list.  If the parameter
 765  * is a GL state reference, look up the current value of that state
 766  * variable and put it into the parameter's Value[4] array.
 767  * This would be called at glBegin time when using a fragment program.
 768  */
 769 void
 770 _mesa_load_state_parameters(GLcontext *ctx,
 771                             struct program_parameter_list *paramList)
 772 {
 773    GLuint i;
 774    for (i = 0; i < paramList->NumParameters; i++) {
 775       if (paramList->Parameters[i].Type == STATE) {
 776          _mesa_fetch_state(ctx, paramList->Parameters[i].StateIndexes,
 777                            paramList->Parameters[i].Values);
 778       }
 779    }
 780 }
 781
 782
 783
 784 /**********************************************************************/
 785 /* API functions                                                      */
 786 /**********************************************************************/
 787
 788
 789 /**
 790  * Bind a program (make it current)
 791  * \note Called from the GL API dispatcher by both glBindProgramNV
 792  * and glBindProgramARB.
 793  */
 794 void GLAPIENTRY
 795 _mesa_BindProgram(GLenum target, GLuint id)
 796 {
 797    struct program *prog;
 798    GET_CURRENT_CONTEXT(ctx);
 799    ASSERT_OUTSIDE_BEGIN_END(ctx);
 800
 801    if ((target == GL_VERTEX_PROGRAM_NV
 802         && ctx->Extensions.NV_vertex_program) ||
 803        (target == GL_VERTEX_PROGRAM_ARB
 804         && ctx->Extensions.ARB_vertex_program)) {
 805       if (ctx->VertexProgram.Current &&
 806           ctx->VertexProgram.Current->Base.Id == id)
 807          return;
 808       /* decrement refcount on previously bound vertex program */
 809       if (ctx->VertexProgram.Current) {
 810          ctx->VertexProgram.Current->Base.RefCount--;
 811          /* and delete if refcount goes below one */
 812          if (ctx->VertexProgram.Current->Base.RefCount <= 0) {
 813             _mesa_delete_program(ctx, &(ctx->VertexProgram.Current->Base));
 814             _mesa_HashRemove(ctx->Shared->Programs, id);
 815          }
 816       }
 817    }
 818    else if ((target == GL_FRAGMENT_PROGRAM_NV
 819              && ctx->Extensions.NV_fragment_program) ||
 820             (target == GL_FRAGMENT_PROGRAM_ARB
 821              && ctx->Extensions.ARB_fragment_program)) {
 822       if (ctx->FragmentProgram.Current &&
 823           ctx->FragmentProgram.Current->Base.Id == id)
 824          return;
 825       /* decrement refcount on previously bound fragment program */
 826       if (ctx->FragmentProgram.Current) {
 827          ctx->FragmentProgram.Current->Base.RefCount--;
 828          /* and delete if refcount goes below one */
 829          if (ctx->FragmentProgram.Current->Base.RefCount <= 0) {
 830             _mesa_delete_program(ctx, &(ctx->FragmentProgram.Current->Base));
 831             _mesa_HashRemove(ctx->Shared->Programs, id);
 832          }
 833       }
 834    }
 835    else {
 836       _mesa_error(ctx, GL_INVALID_ENUM, "glBindProgramNV/ARB(target)");
 837       return;
 838    }
 839
 840    /* NOTE: binding to a non-existant program is not an error.
 841     * That's supposed to be caught in glBegin.
 842     */
 843    if (id == 0) {
 844       /* default program */
 845       prog = NULL;
 846       if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB)
 847          prog = ctx->Shared->DefaultVertexProgram;
 848       else
 849          prog = ctx->Shared->DefaultFragmentProgram;
 850    }
 851    else {
 852       prog = (struct program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 853       if (prog) {
 854          if (prog->Target == 0) {
 855             /* prog was allocated with glGenProgramsNV */
 856             prog->Target = target;
 857          }
 858          else if (prog->Target != target) {
 859             _mesa_error(ctx, GL_INVALID_OPERATION,
 860                         "glBindProgramNV/ARB(target mismatch)");
 861             return;
 862          }
 863       }
 864       else {
 865          /* allocate a new program now */
 866          prog = _mesa_alloc_program(ctx, target, id);
 867          if (!prog) {
 868             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindProgramNV/ARB");
 869             return;
 870          }
 871          prog->Id = id;
 872          prog->Target = target;
 873          prog->Resident = GL_TRUE;
 874          prog->RefCount = 1;
 875          _mesa_HashInsert(ctx->Shared->Programs, id, prog);
 876       }
 877    }
 878
 879    /* bind now */
 880    if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB) {
 881       ctx->VertexProgram.Current = (struct vertex_program *) prog;
 882    }
 883    else if (target == GL_FRAGMENT_PROGRAM_NV || target == GL_FRAGMENT_PROGRAM_ARB) {
 884       ctx->FragmentProgram.Current = (struct fragment_program *) prog;
 885    }
 886
 887    if (prog)
 888       prog->RefCount++;
 889 }
 890
 891
 892 /**
 893  * Delete a list of programs.
 894  * \note Not compiled into display lists.
 895  * \note Called by both glDeleteProgramsNV and glDeleteProgramsARB.
 896  */
 897 void GLAPIENTRY
 898 _mesa_DeletePrograms(GLsizei n, const GLuint *ids)
 899 {
 900    GLint i;
 901    GET_CURRENT_CONTEXT(ctx);
 902    ASSERT_OUTSIDE_BEGIN_END(ctx);
 903
 904    if (n < 0) {
 905       _mesa_error( ctx, GL_INVALID_VALUE, "glDeleteProgramsNV" );
 906       return;
 907    }
 908
 909    for (i = 0; i < n; i++) {
 910       if (ids[i] != 0) {
 911          struct program *prog = (struct program *)
 912             _mesa_HashLookup(ctx->Shared->Programs, ids[i]);
 913          if (prog) {
 914             if (prog->Target == GL_VERTEX_PROGRAM_NV ||
 915                 prog->Target == GL_VERTEX_STATE_PROGRAM_NV) {
 916                if (ctx->VertexProgram.Current &&
 917                    ctx->VertexProgram.Current->Base.Id == ids[i]) {
 918                   /* unbind this currently bound program */
 919                   _mesa_BindProgram(prog->Target, 0);
 920                }
 921             }
 922             else if (prog->Target == GL_FRAGMENT_PROGRAM_NV) {
 923                if (ctx->FragmentProgram.Current &&
 924                    ctx->FragmentProgram.Current->Base.Id == ids[i]) {
 925                   /* unbind this currently bound program */
 926                   _mesa_BindProgram(prog->Target, 0);
 927                }
 928             }
 929             else {
 930                _mesa_problem(ctx, "bad target in glDeleteProgramsNV");
 931                return;
 932             }
 933             prog->RefCount--;
 934             if (prog->RefCount <= 0) {
 935                _mesa_delete_program(ctx, prog);
 936             }
 937          }
 938       }
 939    }
 940 }
 941
 942
 943 /**
 944  * Generate a list of new program identifiers.
 945  * \note Not compiled into display lists.
 946  * \note Called by both glGenProgramsNV and glGenProgramsARB.
 947  */
 948 void GLAPIENTRY
 949 _mesa_GenPrograms(GLsizei n, GLuint *ids)
 950 {
 951    GLuint first;
 952    GLuint i;
 953    GET_CURRENT_CONTEXT(ctx);
 954    ASSERT_OUTSIDE_BEGIN_END(ctx);
 955
 956    if (n < 0) {
 957       _mesa_error(ctx, GL_INVALID_VALUE, "glGenPrograms");
 958       return;
 959    }
 960
 961    if (!ids)
 962       return;
 963
 964    first = _mesa_HashFindFreeKeyBlock(ctx->Shared->Programs, n);
 965
 966    for (i = 0; i < (GLuint) n; i++) {
 967       const int bytes = MAX2(sizeof(struct vertex_program),
 968                              sizeof(struct fragment_program));
 969       struct program *prog = (struct program *) _mesa_calloc(bytes);
 970       if (!prog) {
 971          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenPrograms");
 972          return;
 973       }
 974       prog->RefCount = 1;
 975       prog->Id = first + i;
 976       _mesa_HashInsert(ctx->Shared->Programs, first + i, prog);
 977    }
 978
 979    /* Return the program names */
 980    for (i = 0; i < (GLuint) n; i++) {
 981       ids[i] = first + i;
 982    }
 983 }
 984
 985
 986 /**
 987  * Determine if id names a program.
 988  * \note Not compiled into display lists.
 989  * \note Called from both glIsProgramNV and glIsProgramARB.
 990  * \param id is the program identifier
 991  * \return GL_TRUE if id is a program, else GL_FALSE.
 992  */
 993 GLboolean GLAPIENTRY
 994 _mesa_IsProgram(GLuint id)
 995 {
 996    struct program *prog;
 997    GET_CURRENT_CONTEXT(ctx);
 998    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 999
1000    if (id == 0)
1001       return GL_FALSE;
1002
1003    prog = (struct program *) _mesa_HashLookup(ctx->Shared->Programs, id);
1004    if (prog && prog->Target)
1005       return GL_TRUE;
1006    else
1007       return GL_FALSE;
1008 }
1009
1010
1011
1012 /**********************************************************************/
1013 /* GL_MESA_program_debug extension                                    */
1014 /**********************************************************************/
1015
1016
1017 /* XXX temporary */
1018 void
1019 glProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
1020                       GLvoid *data)
1021 {
1022    _mesa_ProgramCallbackMESA(target, callback, data);
1023 }
1024
1025
1026 void
1027 _mesa_ProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
1028                           GLvoid *data)
1029 {
1030    GET_CURRENT_CONTEXT(ctx);
1031
1032    switch (target) {
1033       case GL_FRAGMENT_PROGRAM_ARB:
1034          if (!ctx->Extensions.ARB_fragment_program) {
1035             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1036             return;
1037          }
1038          ctx->FragmentProgram.Callback = callback;
1039          ctx->FragmentProgram.CallbackData = data;
1040          break;
1041       case GL_FRAGMENT_PROGRAM_NV:
1042          if (!ctx->Extensions.NV_fragment_program) {
1043             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1044             return;
1045          }
1046          ctx->FragmentProgram.Callback = callback;
1047          ctx->FragmentProgram.CallbackData = data;
1048          break;
1049       case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
1050          if (!ctx->Extensions.ARB_vertex_program &&
1051              !ctx->Extensions.NV_vertex_program) {
1052             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1053             return;
1054          }
1055          ctx->VertexProgram.Callback = callback;
1056          ctx->VertexProgram.CallbackData = data;
1057          break;
1058       default:
1059          _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1060          return;
1061    }
1062 }
1063
1064
1065 /* XXX temporary */
1066 void
1067 glGetProgramRegisterfvMESA(GLenum target,
1068                            GLsizei len, const GLubyte *registerName,
1069                            GLfloat *v)
1070 {
1071    _mesa_GetProgramRegisterfvMESA(target, len, registerName, v);
1072 }
1073
1074
1075 void
1076 _mesa_GetProgramRegisterfvMESA(GLenum target,
1077                                GLsizei len, const GLubyte *registerName,
1078                                GLfloat *v)
1079 {
1080    char reg[1000];
1081    GET_CURRENT_CONTEXT(ctx);
1082
1083    /* We _should_ be inside glBegin/glEnd */
1084 #if 0
1085    if (ctx->Driver.CurrentExecPrimitive == PRIM_OUTSIDE_BEGIN_END) {
1086       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetProgramRegisterfvMESA");
1087       return;
1088    }
1089 #endif
1090
1091    /* make null-terminated copy of registerName */
1092    len = MIN2((unsigned int) len, sizeof(reg) - 1);
1093    _mesa_memcpy(reg, registerName, len);
1094    reg[len] = 0;
1095
1096    switch (target) {
1097       case GL_VERTEX_PROGRAM_NV:
1098          if (!ctx->Extensions.ARB_vertex_program &&
1099              !ctx->Extensions.NV_vertex_program) {
1100             _mesa_error(ctx, GL_INVALID_ENUM,
1101                         "glGetProgramRegisterfvMESA(target)");
1102             return;
1103          }
1104          if (!ctx->VertexProgram.Enabled) {
1105             _mesa_error(ctx, GL_INVALID_OPERATION,
1106                         "glGetProgramRegisterfvMESA");
1107             return;
1108          }
1109          /* GL_NV_vertex_program */
1110          if (reg[0] == 'R') {
1111             /* Temp register */
1112             GLint i = _mesa_atoi(reg + 1);
1113             if (i >= (GLint)ctx->Const.MaxVertexProgramTemps) {
1114                _mesa_error(ctx, GL_INVALID_VALUE,
1115                            "glGetProgramRegisterfvMESA(registerName)");
1116                return;
1117             }
1118             COPY_4V(v, ctx->VertexProgram.Temporaries[i]);
1119          }
1120          else if (reg[0] == 'v' && reg[1] == '[') {
1121             /* Vertex Input attribute */
1122             GLuint i;
1123             for (i = 0; i < ctx->Const.MaxVertexProgramAttribs; i++) {
1124                const char *name = _mesa_nv_vertex_input_register_name(i);
1125                char number[10];
1126                sprintf(number, "%d", i);
1127                if (_mesa_strncmp(reg + 2, name, 4) == 0 ||
1128                    _mesa_strncmp(reg + 2, number, _mesa_strlen(number)) == 0) {
1129                   COPY_4V(v, ctx->VertexProgram.Inputs[i]);
1130                   return;
1131                }
1132             }
1133             _mesa_error(ctx, GL_INVALID_VALUE,
1134                         "glGetProgramRegisterfvMESA(registerName)");
1135             return;
1136          }
1137          else if (reg[0] == 'o' && reg[1] == '[') {
1138             /* Vertex output attribute */
1139          }
1140          /* GL_ARB_vertex_program */
1141          else if (_mesa_strncmp(reg, "vertex.", 7) == 0) {
1142
1143          }
1144          else {
1145             _mesa_error(ctx, GL_INVALID_VALUE,
1146                         "glGetProgramRegisterfvMESA(registerName)");
1147             return;
1148          }
1149          break;
1150       case GL_FRAGMENT_PROGRAM_ARB:
1151          if (!ctx->Extensions.ARB_fragment_program) {
1152             _mesa_error(ctx, GL_INVALID_ENUM,
1153                         "glGetProgramRegisterfvMESA(target)");
1154             return;
1155          }
1156          if (!ctx->FragmentProgram.Enabled) {
1157             _mesa_error(ctx, GL_INVALID_OPERATION,
1158                         "glGetProgramRegisterfvMESA");
1159             return;
1160          }
1161          /* XXX to do */
1162          break;
1163       case GL_FRAGMENT_PROGRAM_NV:
1164          if (!ctx->Extensions.NV_fragment_program) {
1165             _mesa_error(ctx, GL_INVALID_ENUM,
1166                         "glGetProgramRegisterfvMESA(target)");
1167             return;
1168          }
1169          if (!ctx->FragmentProgram.Enabled) {
1170             _mesa_error(ctx, GL_INVALID_OPERATION,
1171                         "glGetProgramRegisterfvMESA");
1172             return;
1173          }
1174          if (reg[0] == 'R') {
1175             /* Temp register */
1176             GLint i = _mesa_atoi(reg + 1);
1177             if (i >= (GLint)ctx->Const.MaxFragmentProgramTemps) {
1178                _mesa_error(ctx, GL_INVALID_VALUE,
1179                            "glGetProgramRegisterfvMESA(registerName)");
1180                return;
1181             }
1182             COPY_4V(v, ctx->FragmentProgram.Machine.Temporaries[i]);
1183          }
1184          else if (reg[0] == 'f' && reg[1] == '[') {
1185             /* Fragment input attribute */
1186             GLuint i;
1187             for (i = 0; i < ctx->Const.MaxFragmentProgramAttribs; i++) {
1188                const char *name = _mesa_nv_fragment_input_register_name(i);
1189                if (_mesa_strncmp(reg + 2, name, 4) == 0) {
1190                   COPY_4V(v, ctx->FragmentProgram.Machine.Inputs[i]);
1191                   return;
1192                }
1193             }
1194             _mesa_error(ctx, GL_INVALID_VALUE,
1195                         "glGetProgramRegisterfvMESA(registerName)");
1196             return;
1197          }
1198          else if (_mesa_strcmp(reg, "o[COLR]") == 0) {
1199             /* Fragment output color */
1200             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLR]);
1201          }
1202          else if (_mesa_strcmp(reg, "o[COLH]") == 0) {
1203             /* Fragment output color */
1204             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLH]);
1205          }
1206          else if (_mesa_strcmp(reg, "o[DEPR]") == 0) {
1207             /* Fragment output depth */
1208             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_DEPR]);
1209          }
1210          else {
1211             /* try user-defined identifiers */
1212             const GLfloat *value = _mesa_lookup_parameter_value(
1213                        ctx->FragmentProgram.Current->Parameters, -1, reg);
1214             if (value) {
1215                COPY_4V(v, value);
1216             }
1217             else {
1218                _mesa_error(ctx, GL_INVALID_VALUE,
1219                            "glGetProgramRegisterfvMESA(registerName)");
1220                return;
1221             }
1222          }
1223          break;
1224       default:
1225          _mesa_error(ctx, GL_INVALID_ENUM,
1226                      "glGetProgramRegisterfvMESA(target)");
1227          return;
1228    }
1229
1230 }