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 values - four float values
 333  * \return index of the new parameter.
 334  */
 335 GLint
 336 _mesa_add_state_reference(struct program_parameter_list *paramList,
 337                           const char *stateString)
 338 {
 339    /* XXX Should we parse <stateString> here and produce the parameter's
 340     * list of STATE_* tokens here, or in the parser?
 341     */
 342    return add_parameter(paramList, stateString, NULL, STATE);
 343 }
 344
 345
 346 /**
 347  * Lookup a parameter value by name in the given parameter list.
 348  * \return pointer to the float[4] values.
 349  */
 350 GLfloat *
 351 _mesa_lookup_parameter_value(struct program_parameter_list *paramList,
 352                              GLsizei nameLen, const char *name)
 353 {
 354    GLuint i;
 355
 356    if (nameLen == -1) {
 357       /* name is null-terminated */
 358       for (i = 0; i < paramList->NumParameters; i++) {
 359          if (_mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 360             return paramList->Parameters[i].Values;
 361       }
 362    }
 363    else {
 364       /* name is not null-terminated, use nameLen */
 365       for (i = 0; i < paramList->NumParameters; i++) {
 366          if (_mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 367              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 368             return paramList->Parameters[i].Values;
 369       }
 370    }
 371    return NULL;
 372 }
 373
 374
 375 /**
 376  * Lookup a parameter index by name in the given parameter list.
 377  * \return index of parameter in the list.
 378  */
 379 GLint
 380 _mesa_lookup_parameter_index(struct program_parameter_list *paramList,
 381                              GLsizei nameLen, const char *name)
 382 {
 383    GLint i;
 384
 385    if (nameLen == -1) {
 386       /* name is null-terminated */
 387       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 388          if (_mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 389             return i;
 390       }
 391    }
 392    else {
 393       /* name is not null-terminated, use nameLen */
 394       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 395          if (_mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 396              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 397             return i;
 398       }
 399    }
 400    return -1;
 401 }
 402
 403
 404 /**
 405  * Use the list of tokens in the state[] array to find global GL state
 406  * and return it in <value>.  Usually, four values are returned in <value>
 407  * but matrix queries may return as many as 16 values.
 408  * This function is used for ARB vertex/fragment programs.
 409  * The program parser will produce the state[] values.
 410  */
 411 static void
 412 _mesa_fetch_state(GLcontext *ctx, const enum state_index state[],
 413                   GLfloat *value)
 414 {
 415    switch (state[0]) {
 416    case STATE_MATERIAL:
 417       {
 418          /* state[1] is either 0=front or 1=back side */
 419          const GLuint face = (GLuint) state[1];
 420          /* state[2] is the material attribute */
 421          switch (state[2]) {
 422          case STATE_AMBIENT:
 423             if (face == 0)
 424                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT]);
 425             else
 426                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT]);
 427             return;
 428          case STATE_DIFFUSE:
 429             if (face == 0)
 430                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE]);
 431             else
 432                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE]);
 433             return;
 434          case STATE_SPECULAR:
 435             if (face == 0)
 436                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR]);
 437             else
 438                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SPECULAR]);
 439             return;
 440          case STATE_EMISSION:
 441             if (face == 0)
 442                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION]);
 443             else
 444                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION]);
 445             return;
 446          case STATE_SHININESS:
 447             if (face == 0)
 448                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SHININESS][0];
 449             else
 450                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SHININESS][0];
 451             value[1] = 0.0F;
 452             value[2] = 0.0F;
 453             value[3] = 1.0F;
 454             return;
 455          default:
 456             _mesa_problem(ctx, "Invalid material state in fetch_state");
 457             return;
 458          }
 459       };
 460       return;
 461    case STATE_LIGHT:
 462       {
 463          /* state[1] is the light number */
 464          const GLuint ln = (GLuint) state[1];
 465          /* state[2] is the light attribute */
 466          switch (state[2]) {
 467          case STATE_AMBIENT:
 468             COPY_4V(value, ctx->Light.Light[ln].Ambient);
 469             return;
 470          case STATE_DIFFUSE:
 471             COPY_4V(value, ctx->Light.Light[ln].Diffuse);
 472             return;
 473          case STATE_SPECULAR:
 474             COPY_4V(value, ctx->Light.Light[ln].Specular);
 475             return;
 476          case STATE_POSITION:
 477             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 478             return;
 479          case STATE_ATTENUATION:
 480             value[0] = ctx->Light.Light[ln].ConstantAttenuation;
 481             value[1] = ctx->Light.Light[ln].LinearAttenuation;
 482             value[2] = ctx->Light.Light[ln].QuadraticAttenuation;
 483             value[3] = ctx->Light.Light[ln].SpotExponent;
 484             return;
 485          case STATE_SPOT_DIRECTION:
 486             COPY_4V(value, ctx->Light.Light[ln].EyeDirection);
 487             return;
 488          default:
 489             _mesa_problem(ctx, "Invalid light state in fetch_state");
 490             return;
 491          }
 492       }
 493       return;
 494    case STATE_LIGHTMODEL_AMBIENT:
 495       COPY_4V(value, ctx->Light.Model.Ambient);
 496       return;
 497    case STATE_LIGHTMODEL_SCENECOLOR:
 498       if (state[1] == 0) {
 499          /* front */
 500          GLint i;
 501          for (i = 0; i < 4; i++) {
 502             value[i] = ctx->Light.Model.Ambient[i]
 503                * ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT][i]
 504                + ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION][i];
 505          }
 506       }
 507       else {
 508          /* back */
 509          GLint i;
 510          for (i = 0; i < 4; i++) {
 511             value[i] = ctx->Light.Model.Ambient[i]
 512                * ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT][i]
 513                + ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION][i];
 514          }
 515       }
 516       return;
 517    case STATE_LIGHTPROD:
 518       {
 519          const GLuint ln = (GLuint) state[1];
 520          const GLuint face = (GLuint) state[2];
 521          GLint i;
 522          ASSERT(face == 0 || face == 1);
 523          switch (state[3]) {
 524             case STATE_AMBIENT:
 525                for (i = 0; i < 3; i++) {
 526                   value[i] = ctx->Light.Light[ln].Ambient[i] *
 527                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][i];
 528                }
 529                /* [3] = material alpha */
 530                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 531                return;
 532             case STATE_DIFFUSE:
 533                for (i = 0; i < 3; i++) {
 534                   value[i] = ctx->Light.Light[ln].Diffuse[i] *
 535                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][i];
 536                }
 537                /* [3] = material alpha */
 538                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 539                return;
 540             case STATE_SPECULAR:
 541                for (i = 0; i < 3; i++) {
 542                   value[i] = ctx->Light.Light[ln].Specular[i] *
 543                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][i];
 544                }
 545                /* [3] = material alpha */
 546                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 547                return;
 548             default:
 549                _mesa_problem(ctx, "Invalid lightprod state in fetch_state");
 550                return;
 551          }
 552       }
 553       return;
 554    case STATE_TEXGEN:
 555       {
 556          /* state[1] is the texture unit */
 557          const GLuint unit = (GLuint) state[1];
 558          /* state[2] is the texgen attribute */
 559          switch (state[2]) {
 560          case STATE_TEXGEN_EYE_S:
 561             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneS);
 562             return;
 563          case STATE_TEXGEN_EYE_T:
 564             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneT);
 565             return;
 566          case STATE_TEXGEN_EYE_R:
 567             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneR);
 568             return;
 569          case STATE_TEXGEN_EYE_Q:
 570             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneQ);
 571             return;
 572          case STATE_TEXGEN_OBJECT_S:
 573             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneS);
 574             return;
 575          case STATE_TEXGEN_OBJECT_T:
 576             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneT);
 577             return;
 578          case STATE_TEXGEN_OBJECT_R:
 579             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneR);
 580             return;
 581          case STATE_TEXGEN_OBJECT_Q:
 582             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneQ);
 583             return;
 584          default:
 585             _mesa_problem(ctx, "Invalid texgen state in fetch_state");
 586             return;
 587          }
 588       }
 589       return;
 590    case STATE_FOG_COLOR:
 591       COPY_4V(value, ctx->Fog.Color);
 592       return;
 593    case STATE_FOG_PARAMS:
 594       value[0] = ctx->Fog.Density;
 595       value[1] = ctx->Fog.Start;
 596       value[2] = ctx->Fog.End;
 597       value[3] = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
 598       return;
 599    case STATE_CLIPPLANE:
 600       {
 601          const GLuint plane = (GLuint) state[1];
 602          COPY_4V(value, ctx->Transform.EyeUserPlane[plane]);
 603       }
 604       return;
 605    case STATE_POINT_SIZE:
 606       value[0] = ctx->Point.Size;
 607       value[1] = ctx->Point.MinSize;
 608       value[2] = ctx->Point.MaxSize;
 609       value[3] = ctx->Point.Threshold;
 610       return;
 611    case STATE_POINT_ATTENUATION:
 612       value[0] = ctx->Point.Params[0];
 613       value[1] = ctx->Point.Params[1];
 614       value[2] = ctx->Point.Params[2];
 615       value[3] = 1.0F;
 616       return;
 617    case STATE_MATRIX:
 618       {
 619          /* state[1] = modelview, projection, texture, etc. */
 620          /* state[2] = which texture matrix or program matrix */
 621          /* state[3] = first column to fetch */
 622          /* state[4] = last column to fetch */
 623          /* state[5] = transpose, inverse or invtrans */
 624
 625          const GLmatrix *matrix;
 626          const enum state_index mat = state[1];
 627          const GLuint index = (GLuint) state[2];
 628          const GLuint first = (GLuint) state[3];
 629          const GLuint last = (GLuint) state[4];
 630          const enum state_index modifier = state[5];
 631          const GLfloat *m;
 632          GLuint row, i;
 633          if (mat == STATE_MODELVIEW) {
 634             matrix = ctx->ModelviewMatrixStack.Top;
 635          }
 636          else if (mat == STATE_PROJECTION) {
 637             matrix = ctx->ProjectionMatrixStack.Top;
 638          }
 639          else if (mat == STATE_MVP) {
 640             matrix = &ctx->_ModelProjectMatrix;
 641          }
 642          else if (mat == STATE_TEXTURE) {
 643             matrix = ctx->TextureMatrixStack[index].Top;
 644          }
 645          else if (mat == STATE_PROGRAM) {
 646             matrix = ctx->ProgramMatrixStack[index].Top;
 647          }
 648          else {
 649             _mesa_problem(ctx, "Bad matrix name in _mesa_fetch_state()");
 650             return;
 651          }
 652          if (modifier == STATE_MATRIX_INVERSE ||
 653              modifier == STATE_MATRIX_INVTRANS) {
 654             /* XXX be sure inverse is up to date */
 655             m = matrix->inv;
 656          }
 657          else {
 658             m = matrix->m;
 659          }
 660          if (modifier == STATE_MATRIX_TRANSPOSE ||
 661              modifier == STATE_MATRIX_INVTRANS) {
 662             for (i = 0, row = first; row <= last; row++) {
 663                value[i++] = m[row * 4 + 0];
 664                value[i++] = m[row * 4 + 1];
 665                value[i++] = m[row * 4 + 2];
 666                value[i++] = m[row * 4 + 3];
 667             }
 668          }
 669          else {
 670             for (i = 0, row = first; row <= last; row++) {
 671                value[i++] = m[row + 0];
 672                value[i++] = m[row + 4];
 673                value[i++] = m[row + 8];
 674                value[i++] = m[row + 12];
 675             }
 676          }
 677       }
 678       return;
 679    default:
 680       _mesa_problem(ctx, "Invalid state in fetch_state");
 681       return;
 682    }
 683 }
 684
 685
 686 /**
 687  * Loop over all the parameters in a parameter list.  If the parameter
 688  * is a GL state reference, look up the current value of that state
 689  * variable and put it into the parameter's Value[4] array.
 690  * This would be called at glBegin time when using a fragment program.
 691  */
 692 void
 693 _mesa_load_state_parameters(GLcontext *ctx,
 694                             struct program_parameter_list *paramList)
 695 {
 696    GLuint i;
 697    for (i = 0; i < paramList->NumParameters; i++) {
 698       if (paramList->Parameters[i].Type == STATE) {
 699          _mesa_fetch_state(ctx, paramList->Parameters[i].StateIndexes,
 700                            paramList->Parameters[i].Values);
 701       }
 702    }
 703 }
 704
 705
 706
 707 /**********************************************************************/
 708 /* API functions                                                      */
 709 /**********************************************************************/
 710
 711
 712 /**
 713  * Bind a program (make it current)
 714  * \note Called from the GL API dispatcher by both glBindProgramNV
 715  * and glBindProgramARB.
 716  */
 717 void
 718 _mesa_BindProgram(GLenum target, GLuint id)
 719 {
 720    struct program *prog;
 721    GET_CURRENT_CONTEXT(ctx);
 722    ASSERT_OUTSIDE_BEGIN_END(ctx);
 723
 724    if ((target == GL_VERTEX_PROGRAM_NV
 725         && ctx->Extensions.NV_vertex_program) ||
 726        (target == GL_VERTEX_PROGRAM_ARB
 727         && ctx->Extensions.ARB_vertex_program)) {
 728       if (ctx->VertexProgram.Current &&
 729           ctx->VertexProgram.Current->Base.Id == id)
 730          return;
 731       /* decrement refcount on previously bound vertex program */
 732       if (ctx->VertexProgram.Current) {
 733          ctx->VertexProgram.Current->Base.RefCount--;
 734          /* and delete if refcount goes below one */
 735          if (ctx->VertexProgram.Current->Base.RefCount <= 0) {
 736             _mesa_delete_program(ctx, &(ctx->VertexProgram.Current->Base));
 737             _mesa_HashRemove(ctx->Shared->Programs, id);
 738          }
 739       }
 740    }
 741    else if ((target == GL_FRAGMENT_PROGRAM_NV
 742              && ctx->Extensions.NV_fragment_program) ||
 743             (target == GL_FRAGMENT_PROGRAM_ARB
 744              && ctx->Extensions.ARB_fragment_program)) {
 745       if (ctx->FragmentProgram.Current &&
 746           ctx->FragmentProgram.Current->Base.Id == id)
 747          return;
 748       /* decrement refcount on previously bound fragment program */
 749       if (ctx->FragmentProgram.Current) {
 750          ctx->FragmentProgram.Current->Base.RefCount--;
 751          /* and delete if refcount goes below one */
 752          if (ctx->FragmentProgram.Current->Base.RefCount <= 0) {
 753             _mesa_delete_program(ctx, &(ctx->FragmentProgram.Current->Base));
 754             _mesa_HashRemove(ctx->Shared->Programs, id);
 755          }
 756       }
 757    }
 758    else {
 759       _mesa_error(ctx, GL_INVALID_ENUM, "glBindProgramNV/ARB(target)");
 760       return;
 761    }
 762
 763    /* NOTE: binding to a non-existant program is not an error.
 764     * That's supposed to be caught in glBegin.
 765     */
 766    if (id == 0) {
 767       /* default program */
 768       prog = NULL;
 769       if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB)
 770          prog = ctx->Shared->DefaultVertexProgram;
 771       else
 772          prog = ctx->Shared->DefaultFragmentProgram;
 773    }
 774    else {
 775       prog = (struct program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 776       if (prog) {
 777          if (prog->Target == 0) {
 778             /* prog was allocated with glGenProgramsNV */
 779             prog->Target = target;
 780          }
 781          else if (prog->Target != target) {
 782             _mesa_error(ctx, GL_INVALID_OPERATION,
 783                         "glBindProgramNV/ARB(target mismatch)");
 784             return;
 785          }
 786       }
 787       else {
 788          /* allocate a new program now */
 789          prog = _mesa_alloc_program(ctx, target, id);
 790          if (!prog) {
 791             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindProgramNV/ARB");
 792             return;
 793          }
 794          prog->Id = id;
 795          prog->Target = target;
 796          prog->Resident = GL_TRUE;
 797          prog->RefCount = 1;
 798          _mesa_HashInsert(ctx->Shared->Programs, id, prog);
 799       }
 800    }
 801
 802    /* bind now */
 803    if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB) {
 804       ctx->VertexProgram.Current = (struct vertex_program *) prog;
 805    }
 806    else if (target == GL_FRAGMENT_PROGRAM_NV || target == GL_FRAGMENT_PROGRAM_ARB) {
 807       ctx->FragmentProgram.Current = (struct fragment_program *) prog;
 808    }
 809
 810    if (prog)
 811       prog->RefCount++;
 812 }
 813
 814
 815 /**
 816  * Delete a list of programs.
 817  * \note Not compiled into display lists.
 818  * \note Called by both glDeleteProgramsNV and glDeleteProgramsARB.
 819  */
 820 void
 821 _mesa_DeletePrograms(GLsizei n, const GLuint *ids)
 822 {
 823    GLint i;
 824    GET_CURRENT_CONTEXT(ctx);
 825    ASSERT_OUTSIDE_BEGIN_END(ctx);
 826
 827    if (n < 0) {
 828       _mesa_error( ctx, GL_INVALID_VALUE, "glDeleteProgramsNV" );
 829       return;
 830    }
 831
 832    for (i = 0; i < n; i++) {
 833       if (ids[i] != 0) {
 834          struct program *prog = (struct program *)
 835             _mesa_HashLookup(ctx->Shared->Programs, ids[i]);
 836          if (prog) {
 837             if (prog->Target == GL_VERTEX_PROGRAM_NV ||
 838                 prog->Target == GL_VERTEX_STATE_PROGRAM_NV) {
 839                if (ctx->VertexProgram.Current &&
 840                    ctx->VertexProgram.Current->Base.Id == ids[i]) {
 841                   /* unbind this currently bound program */
 842                   _mesa_BindProgram(prog->Target, 0);
 843                }
 844             }
 845             else if (prog->Target == GL_FRAGMENT_PROGRAM_NV) {
 846                if (ctx->FragmentProgram.Current &&
 847                    ctx->FragmentProgram.Current->Base.Id == ids[i]) {
 848                   /* unbind this currently bound program */
 849                   _mesa_BindProgram(prog->Target, 0);
 850                }
 851             }
 852             else {
 853                _mesa_problem(ctx, "bad target in glDeleteProgramsNV");
 854                return;
 855             }
 856             prog->RefCount--;
 857             if (prog->RefCount <= 0) {
 858                _mesa_delete_program(ctx, prog);
 859             }
 860          }
 861       }
 862    }
 863 }
 864
 865
 866 /**
 867  * Generate a list of new program identifiers.
 868  * \note Not compiled into display lists.
 869  * \note Called by both glGenProgramsNV and glGenProgramsARB.
 870  */
 871 void
 872 _mesa_GenPrograms(GLsizei n, GLuint *ids)
 873 {
 874    GLuint first;
 875    GLuint i;
 876    GET_CURRENT_CONTEXT(ctx);
 877    ASSERT_OUTSIDE_BEGIN_END(ctx);
 878
 879    if (n < 0) {
 880       _mesa_error(ctx, GL_INVALID_VALUE, "glGenPrograms");
 881       return;
 882    }
 883
 884    if (!ids)
 885       return;
 886
 887    first = _mesa_HashFindFreeKeyBlock(ctx->Shared->Programs, n);
 888
 889    for (i = 0; i < (GLuint) n; i++) {
 890       const int bytes = MAX2(sizeof(struct vertex_program),
 891                              sizeof(struct fragment_program));
 892       struct program *prog = (struct program *) _mesa_calloc(bytes);
 893       if (!prog) {
 894          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenPrograms");
 895          return;
 896       }
 897       prog->RefCount = 1;
 898       prog->Id = first + i;
 899       _mesa_HashInsert(ctx->Shared->Programs, first + i, prog);
 900    }
 901
 902    /* Return the program names */
 903    for (i = 0; i < (GLuint) n; i++) {
 904       ids[i] = first + i;
 905    }
 906 }
 907
 908
 909 /**
 910  * Determine if id names a program.
 911  * \note Not compiled into display lists.
 912  * \note Called from both glIsProgramNV and glIsProgramARB.
 913  * \param id is the program identifier
 914  * \return GL_TRUE if id is a program, else GL_FALSE.
 915  */
 916 GLboolean
 917 _mesa_IsProgram(GLuint id)
 918 {
 919    struct program *prog;
 920    GET_CURRENT_CONTEXT(ctx);
 921    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
 922
 923    if (id == 0)
 924       return GL_FALSE;
 925
 926    prog = (struct program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 927    if (prog && prog->Target)
 928       return GL_TRUE;
 929    else
 930       return GL_FALSE;
 931 }
 932
 933
 934
 935 /**********************************************************************/
 936 /* GL_MESA_program_debug extension                                    */
 937 /**********************************************************************/
 938
 939
 940 /* XXX temporary */
 941 void
 942 glProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
 943                       GLvoid *data)
 944 {
 945    _mesa_ProgramCallbackMESA(target, callback, data);
 946 }
 947
 948
 949 void
 950 _mesa_ProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
 951                           GLvoid *data)
 952 {
 953    GET_CURRENT_CONTEXT(ctx);
 954
 955    switch (target) {
 956       case GL_FRAGMENT_PROGRAM_ARB:
 957          if (!ctx->Extensions.ARB_fragment_program) {
 958             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
 959             return;
 960          }
 961          ctx->FragmentProgram.Callback = callback;
 962          ctx->FragmentProgram.CallbackData = data;
 963          break;
 964       case GL_FRAGMENT_PROGRAM_NV:
 965          if (!ctx->Extensions.NV_fragment_program) {
 966             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
 967             return;
 968          }
 969          ctx->FragmentProgram.Callback = callback;
 970          ctx->FragmentProgram.CallbackData = data;
 971          break;
 972       case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
 973          if (!ctx->Extensions.ARB_vertex_program &&
 974              !ctx->Extensions.NV_vertex_program) {
 975             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
 976             return;
 977          }
 978          ctx->VertexProgram.Callback = callback;
 979          ctx->VertexProgram.CallbackData = data;
 980          break;
 981       default:
 982          _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
 983          return;
 984    }
 985 }
 986
 987
 988 /* XXX temporary */
 989 void
 990 glGetProgramRegisterfvMESA(GLenum target,
 991                            GLsizei len, const GLubyte *registerName,
 992                            GLfloat *v)
 993 {
 994    _mesa_GetProgramRegisterfvMESA(target, len, registerName, v);
 995 }
 996
 997
 998 void
 999 _mesa_GetProgramRegisterfvMESA(GLenum target,
1000                                GLsizei len, const GLubyte *registerName,
1001                                GLfloat *v)
1002 {
1003    char reg[1000];
1004    GET_CURRENT_CONTEXT(ctx);
1005
1006    /* We _should_ be inside glBegin/glEnd */
1007 #if 0
1008    if (ctx->Driver.CurrentExecPrimitive == PRIM_OUTSIDE_BEGIN_END) {
1009       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetProgramRegisterfvMESA");
1010       return;
1011    }
1012 #endif
1013
1014    /* make null-terminated copy of registerName */
1015    len = MIN2((unsigned int) len, sizeof(reg) - 1);
1016    _mesa_memcpy(reg, registerName, len);
1017    reg[len] = 0;
1018
1019    switch (target) {
1020       case GL_VERTEX_PROGRAM_NV:
1021          if (!ctx->Extensions.ARB_vertex_program &&
1022              !ctx->Extensions.NV_vertex_program) {
1023             _mesa_error(ctx, GL_INVALID_ENUM,
1024                         "glGetProgramRegisterfvMESA(target)");
1025             return;
1026          }
1027          if (!ctx->VertexProgram.Enabled) {
1028             _mesa_error(ctx, GL_INVALID_OPERATION,
1029                         "glGetProgramRegisterfvMESA");
1030             return;
1031          }
1032          /* GL_NV_vertex_program */
1033          if (reg[0] == 'R') {
1034             /* Temp register */
1035             GLint i = _mesa_atoi(reg + 1);
1036             if (i >= (GLint)ctx->Const.MaxVertexProgramTemps) {
1037                _mesa_error(ctx, GL_INVALID_VALUE,
1038                            "glGetProgramRegisterfvMESA(registerName)");
1039                return;
1040             }
1041             COPY_4V(v, ctx->VertexProgram.Temporaries[i]);
1042          }
1043          else if (reg[0] == 'v' && reg[1] == '[') {
1044             /* Vertex Input attribute */
1045             GLuint i;
1046             for (i = 0; i < ctx->Const.MaxVertexProgramAttribs; i++) {
1047                const char *name = _mesa_nv_vertex_input_register_name(i);
1048                char number[10];
1049                sprintf(number, "%d", i);
1050                if (_mesa_strncmp(reg + 2, name, 4) == 0 ||
1051                    _mesa_strncmp(reg + 2, number, _mesa_strlen(number)) == 0) {
1052                   COPY_4V(v, ctx->VertexProgram.Inputs[i]);
1053                   return;
1054                }
1055             }
1056             _mesa_error(ctx, GL_INVALID_VALUE,
1057                         "glGetProgramRegisterfvMESA(registerName)");
1058             return;
1059          }
1060          else if (reg[0] == 'o' && reg[1] == '[') {
1061             /* Vertex output attribute */
1062          }
1063          /* GL_ARB_vertex_program */
1064          else if (_mesa_strncmp(reg, "vertex.", 7) == 0) {
1065
1066          }
1067          else {
1068             _mesa_error(ctx, GL_INVALID_VALUE,
1069                         "glGetProgramRegisterfvMESA(registerName)");
1070             return;
1071          }
1072          break;
1073       case GL_FRAGMENT_PROGRAM_ARB:
1074          if (!ctx->Extensions.ARB_fragment_program) {
1075             _mesa_error(ctx, GL_INVALID_ENUM,
1076                         "glGetProgramRegisterfvMESA(target)");
1077             return;
1078          }
1079          if (!ctx->FragmentProgram.Enabled) {
1080             _mesa_error(ctx, GL_INVALID_OPERATION,
1081                         "glGetProgramRegisterfvMESA");
1082             return;
1083          }
1084          /* XXX to do */
1085          break;
1086       case GL_FRAGMENT_PROGRAM_NV:
1087          if (!ctx->Extensions.NV_fragment_program) {
1088             _mesa_error(ctx, GL_INVALID_ENUM,
1089                         "glGetProgramRegisterfvMESA(target)");
1090             return;
1091          }
1092          if (!ctx->FragmentProgram.Enabled) {
1093             _mesa_error(ctx, GL_INVALID_OPERATION,
1094                         "glGetProgramRegisterfvMESA");
1095             return;
1096          }
1097          if (reg[0] == 'R') {
1098             /* Temp register */
1099             GLint i = _mesa_atoi(reg + 1);
1100             if (i >= (GLint)ctx->Const.MaxFragmentProgramTemps) {
1101                _mesa_error(ctx, GL_INVALID_VALUE,
1102                            "glGetProgramRegisterfvMESA(registerName)");
1103                return;
1104             }
1105             COPY_4V(v, ctx->FragmentProgram.Machine.Temporaries[i]);
1106          }
1107          else if (reg[0] == 'f' && reg[1] == '[') {
1108             /* Fragment input attribute */
1109             GLuint i;
1110             for (i = 0; i < ctx->Const.MaxFragmentProgramAttribs; i++) {
1111                const char *name = _mesa_nv_fragment_input_register_name(i);
1112                if (_mesa_strncmp(reg + 2, name, 4) == 0) {
1113                   COPY_4V(v, ctx->FragmentProgram.Machine.Inputs[i]);
1114                   return;
1115                }
1116             }
1117             _mesa_error(ctx, GL_INVALID_VALUE,
1118                         "glGetProgramRegisterfvMESA(registerName)");
1119             return;
1120          }
1121          else if (_mesa_strcmp(reg, "o[COLR]") == 0) {
1122             /* Fragment output color */
1123             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLR]);
1124          }
1125          else if (_mesa_strcmp(reg, "o[COLH]") == 0) {
1126             /* Fragment output color */
1127             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLH]);
1128          }
1129          else if (_mesa_strcmp(reg, "o[DEPR]") == 0) {
1130             /* Fragment output depth */
1131             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_DEPR]);
1132          }
1133          else {
1134             /* try user-defined identifiers */
1135             const GLfloat *value = _mesa_lookup_parameter_value(
1136                        ctx->FragmentProgram.Current->Parameters, -1, reg);
1137             if (value) {
1138                COPY_4V(v, value);
1139             }
1140             else {
1141                _mesa_error(ctx, GL_INVALID_VALUE,
1142                            "glGetProgramRegisterfvMESA(registerName)");
1143                return;
1144             }
1145          }
1146          break;
1147       default:
1148          _mesa_error(ctx, GL_INVALID_ENUM,
1149                      "glGetProgramRegisterfvMESA(target)");
1150          return;
1151    }
1152
1153 }