src/mesa/main/program.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.0
   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
  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 static struct program * _mesa_init_program_struct( GLcontext *ctx,
 142                                                    struct program *prog,
 143                                                    GLenum target, GLuint id)
 144 {
 145    if (prog) {
 146       prog->Id = id;
 147       prog->Target = target;
 148       prog->Resident = GL_TRUE;
 149       prog->RefCount = 1;
 150    }
 151
 152    return prog;
 153 }
 154
 155 struct program * _mesa_init_fragment_program( GLcontext *ctx,
 156                                               struct fragment_program *prog,
 157                                               GLenum target, GLuint id)
 158 {
 159    if (prog)
 160       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 161    else
 162       return NULL;
 163 }
 164
 165 struct program * _mesa_init_vertex_program( GLcontext *ctx,
 166                                             struct vertex_program *prog,
 167                                             GLenum target, GLuint id)
 168 {
 169    if (prog)
 170       return _mesa_init_program_struct( ctx, &prog->Base, target, id );
 171    else
 172       return NULL;
 173 }
 174
 175
 176 /**
 177  * Allocate and initialize a new fragment/vertex program object but
 178  * don't put it into the program hash table.  Called via
 179  * ctx->Driver.NewProgram.  May be overridden (ie. replaced) by a
 180  * device driver function to implement OO deriviation with additional
 181  * types not understood by this function.
 182  *
 183  * \param ctx  context
 184  * \param id   program id/number
 185  * \param target  program target/type
 186  * \return  pointer to new program object
 187  */
 188 struct program *
 189 _mesa_new_program(GLcontext *ctx, GLenum target, GLuint id)
 190 {
 191    switch (target) {
 192    case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
 193       return _mesa_init_vertex_program( ctx, CALLOC_STRUCT(vertex_program),
 194                                         target, id );
 195
 196    case GL_FRAGMENT_PROGRAM_NV:
 197    case GL_FRAGMENT_PROGRAM_ARB:
 198       return _mesa_init_fragment_program( ctx, CALLOC_STRUCT(fragment_program),
 199                                           target, id );
 200
 201    default:
 202       _mesa_problem(ctx, "bad target in _mesa_new_program");
 203       return NULL;
 204    }
 205 }
 206
 207
 208 /**
 209  * Delete a program and remove it from the hash table, ignoring the
 210  * reference count.
 211  * Called via ctx->Driver.DeleteProgram.  May be wrapped (OO deriviation)
 212  * by a device driver function.
 213  */
 214 void
 215 _mesa_delete_program(GLcontext *ctx, struct program *prog)
 216 {
 217    ASSERT(prog);
 218
 219    if (prog->String)
 220       _mesa_free(prog->String);
 221    if (prog->Target == GL_VERTEX_PROGRAM_NV ||
 222        prog->Target == GL_VERTEX_STATE_PROGRAM_NV) {
 223       struct vertex_program *vprog = (struct vertex_program *) prog;
 224       if (vprog->Instructions)
 225          _mesa_free(vprog->Instructions);
 226    }
 227    else if (prog->Target == GL_FRAGMENT_PROGRAM_NV ||
 228             prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
 229       struct fragment_program *fprog = (struct fragment_program *) prog;
 230       if (fprog->Instructions)
 231          _mesa_free(fprog->Instructions);
 232       if (fprog->Parameters) {
 233          _mesa_free_parameter_list(fprog->Parameters);
 234       }
 235    }
 236    _mesa_free(prog);
 237 }
 238
 239
 240
 241 /**********************************************************************/
 242 /* Program parameter functions                                        */
 243 /**********************************************************************/
 244
 245 struct program_parameter_list *
 246 _mesa_new_parameter_list(void)
 247 {
 248    return (struct program_parameter_list *)
 249       _mesa_calloc(sizeof(struct program_parameter_list));
 250 }
 251
 252
 253 /**
 254  * Free a parameter list and all its parameters
 255  */
 256 void
 257 _mesa_free_parameter_list(struct program_parameter_list *paramList)
 258 {
 259    _mesa_free_parameters(paramList);
 260    _mesa_free(paramList);
 261 }
 262
 263
 264 /**
 265  * Free all the parameters in the given list, but don't free the
 266  * paramList structure itself.
 267  */
 268 void
 269 _mesa_free_parameters(struct program_parameter_list *paramList)
 270 {
 271    GLuint i;
 272    for (i = 0; i < paramList->NumParameters; i++) {
 273       _mesa_free((void *) paramList->Parameters[i].Name);
 274    }
 275    _mesa_free(paramList->Parameters);
 276    paramList->NumParameters = 0;
 277    paramList->Parameters = NULL;
 278 }
 279
 280
 281 /**
 282  * Helper function used by the functions below.
 283  */
 284 static GLint
 285 add_parameter(struct program_parameter_list *paramList,
 286               const char *name, const GLfloat values[4],
 287               enum parameter_type type)
 288 {
 289    const GLuint n = paramList->NumParameters;
 290
 291    paramList->Parameters = (struct program_parameter *)
 292       _mesa_realloc(paramList->Parameters,
 293                     n * sizeof(struct program_parameter),
 294                     (n + 1) * sizeof(struct program_parameter));
 295    if (!paramList->Parameters) {
 296       /* out of memory */
 297       paramList->NumParameters = 0;
 298       return -1;
 299    }
 300    else {
 301       paramList->NumParameters = n + 1;
 302       paramList->Parameters[n].Name = _mesa_strdup(name);
 303       paramList->Parameters[n].Type = type;
 304       if (values)
 305          COPY_4V(paramList->Parameters[n].Values, values);
 306       return (GLint) n;
 307    }
 308 }
 309
 310
 311 /**
 312  * Add a new named program parameter (Ex: NV_fragment_program DEFINE statement)
 313  * \return index of the new entry in the parameter list
 314  */
 315 GLint
 316 _mesa_add_named_parameter(struct program_parameter_list *paramList,
 317                           const char *name, const GLfloat values[4])
 318 {
 319    return add_parameter(paramList, name, values, NAMED_PARAMETER);
 320 }
 321
 322
 323 /**
 324  * Add a new unnamed constant to the parameter list.
 325  * \param paramList - the parameter list
 326  * \param values - four float values
 327  * \return index of the new parameter.
 328  */
 329 GLint
 330 _mesa_add_named_constant(struct program_parameter_list *paramList,
 331                          const char *name, const GLfloat values[4])
 332 {
 333    return add_parameter(paramList, name, values, CONSTANT);
 334 }
 335
 336
 337 /**
 338  * Add a new unnamed constant to the parameter list.
 339  * \param paramList - the parameter list
 340  * \param values - four float values
 341  * \return index of the new parameter.
 342  */
 343 GLint
 344 _mesa_add_unnamed_constant(struct program_parameter_list *paramList,
 345                            const GLfloat values[4])
 346 {
 347    /* generate a new dummy name */
 348    static GLuint n = 0;
 349    char name[20];
 350    _mesa_sprintf(name, "constant%d", n);
 351    n++;
 352    /* store it */
 353    return add_parameter(paramList, name, values, CONSTANT);
 354 }
 355
 356
 357 /**
 358  * Add a new state reference to the parameter list.
 359  * \param paramList - the parameter list
 360  * \param state     - an array of 6 state tokens
 361  *
 362  * \return index of the new parameter.
 363  */
 364 GLint
 365 _mesa_add_state_reference(struct program_parameter_list *paramList,
 366                           GLint *stateTokens)
 367 {
 368    /* XXX Should we parse <stateString> here and produce the parameter's
 369     * list of STATE_* tokens here, or in the parser?
 370     */
 371    GLint a, idx;
 372
 373    idx = add_parameter(paramList, "Some State", NULL, STATE);
 374
 375    for (a=0; a<6; a++)
 376       paramList->Parameters[idx].StateIndexes[a] = (enum state_index) stateTokens[a];
 377
 378    return idx;
 379 }
 380
 381
 382 /**
 383  * Lookup a parameter value by name in the given parameter list.
 384  * \return pointer to the float[4] values.
 385  */
 386 GLfloat *
 387 _mesa_lookup_parameter_value(struct program_parameter_list *paramList,
 388                              GLsizei nameLen, const char *name)
 389 {
 390    GLuint i;
 391
 392    if (!paramList)
 393       return NULL;
 394
 395    if (nameLen == -1) {
 396       /* name is null-terminated */
 397       for (i = 0; i < paramList->NumParameters; i++) {
 398          if (_mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 399             return paramList->Parameters[i].Values;
 400       }
 401    }
 402    else {
 403       /* name is not null-terminated, use nameLen */
 404       for (i = 0; i < paramList->NumParameters; i++) {
 405          if (_mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 406              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 407             return paramList->Parameters[i].Values;
 408       }
 409    }
 410    return NULL;
 411 }
 412
 413
 414 /**
 415  * Lookup a parameter index by name in the given parameter list.
 416  * \return index of parameter in the list.
 417  */
 418 GLint
 419 _mesa_lookup_parameter_index(struct program_parameter_list *paramList,
 420                              GLsizei nameLen, const char *name)
 421 {
 422    GLint i;
 423
 424    if (!paramList)
 425       return -1;
 426
 427    if (nameLen == -1) {
 428       /* name is null-terminated */
 429       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 430          if (_mesa_strcmp(paramList->Parameters[i].Name, name) == 0)
 431             return i;
 432       }
 433    }
 434    else {
 435       /* name is not null-terminated, use nameLen */
 436       for (i = 0; i < (GLint) paramList->NumParameters; i++) {
 437          if (_mesa_strncmp(paramList->Parameters[i].Name, name, nameLen) == 0
 438              && _mesa_strlen(paramList->Parameters[i].Name) == (size_t)nameLen)
 439             return i;
 440       }
 441    }
 442    return -1;
 443 }
 444
 445
 446 /**
 447  * Use the list of tokens in the state[] array to find global GL state
 448  * and return it in <value>.  Usually, four values are returned in <value>
 449  * but matrix queries may return as many as 16 values.
 450  * This function is used for ARB vertex/fragment programs.
 451  * The program parser will produce the state[] values.
 452  */
 453 static void
 454 _mesa_fetch_state(GLcontext *ctx, const enum state_index state[],
 455                   GLfloat *value)
 456 {
 457    switch (state[0]) {
 458    case STATE_MATERIAL:
 459       {
 460          /* state[1] is either 0=front or 1=back side */
 461          const GLuint face = (GLuint) state[1];
 462          /* state[2] is the material attribute */
 463          switch (state[2]) {
 464          case STATE_AMBIENT:
 465             if (face == 0)
 466                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT]);
 467             else
 468                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT]);
 469             return;
 470          case STATE_DIFFUSE:
 471             if (face == 0)
 472                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE]);
 473             else
 474                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE]);
 475             return;
 476          case STATE_SPECULAR:
 477             if (face == 0)
 478                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR]);
 479             else
 480                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SPECULAR]);
 481             return;
 482          case STATE_EMISSION:
 483             if (face == 0)
 484                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION]);
 485             else
 486                COPY_4V(value, ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION]);
 487             return;
 488          case STATE_SHININESS:
 489             if (face == 0)
 490                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SHININESS][0];
 491             else
 492                value[0] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_SHININESS][0];
 493             value[1] = 0.0F;
 494             value[2] = 0.0F;
 495             value[3] = 1.0F;
 496             return;
 497          default:
 498             _mesa_problem(ctx, "Invalid material state in fetch_state");
 499             return;
 500          }
 501       };
 502       return;
 503    case STATE_LIGHT:
 504       {
 505          /* state[1] is the light number */
 506          const GLuint ln = (GLuint) state[1];
 507          /* state[2] is the light attribute */
 508          switch (state[2]) {
 509          case STATE_AMBIENT:
 510             COPY_4V(value, ctx->Light.Light[ln].Ambient);
 511             return;
 512          case STATE_DIFFUSE:
 513             COPY_4V(value, ctx->Light.Light[ln].Diffuse);
 514             return;
 515          case STATE_SPECULAR:
 516             COPY_4V(value, ctx->Light.Light[ln].Specular);
 517             return;
 518          case STATE_POSITION:
 519             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 520             return;
 521          case STATE_ATTENUATION:
 522             value[0] = ctx->Light.Light[ln].ConstantAttenuation;
 523             value[1] = ctx->Light.Light[ln].LinearAttenuation;
 524             value[2] = ctx->Light.Light[ln].QuadraticAttenuation;
 525             value[3] = ctx->Light.Light[ln].SpotExponent;
 526             return;
 527          case STATE_SPOT_DIRECTION:
 528             COPY_4V(value, ctx->Light.Light[ln].EyeDirection);
 529             return;
 530          case STATE_HALF:
 531             {
 532                GLfloat eye_z[] = {0, 0, 1};
 533
 534                /* Compute infinite half angle vector:
 535                 *   half-vector = light_position + (0, 0, 1)
 536                 * and then normalize.  w = 0
 537                                          *
 538                                          * light.EyePosition.w should be 0 for infinite lights.
 539                 */
 540                                         ADD_3V(value, eye_z, ctx->Light.Light[ln].EyePosition);
 541                                         NORMALIZE_3FV(value);
 542                                         value[3] = 0;
 543             }
 544             return;
 545          default:
 546             _mesa_problem(ctx, "Invalid light state in fetch_state");
 547             return;
 548          }
 549       }
 550       return;
 551    case STATE_LIGHTMODEL_AMBIENT:
 552       COPY_4V(value, ctx->Light.Model.Ambient);
 553       return;
 554    case STATE_LIGHTMODEL_SCENECOLOR:
 555       if (state[1] == 0) {
 556          /* front */
 557          GLint i;
 558          for (i = 0; i < 4; i++) {
 559             value[i] = ctx->Light.Model.Ambient[i]
 560                * ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT][i]
 561                + ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION][i];
 562          }
 563       }
 564       else {
 565          /* back */
 566          GLint i;
 567          for (i = 0; i < 4; i++) {
 568             value[i] = ctx->Light.Model.Ambient[i]
 569                * ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT][i]
 570                + ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION][i];
 571          }
 572       }
 573       return;
 574    case STATE_LIGHTPROD:
 575       {
 576          const GLuint ln = (GLuint) state[1];
 577          const GLuint face = (GLuint) state[2];
 578          GLint i;
 579          ASSERT(face == 0 || face == 1);
 580          switch (state[3]) {
 581             case STATE_AMBIENT:
 582                for (i = 0; i < 3; i++) {
 583                   value[i] = ctx->Light.Light[ln].Ambient[i] *
 584                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][i];
 585                }
 586                /* [3] = material alpha */
 587                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 588                return;
 589             case STATE_DIFFUSE:
 590                for (i = 0; i < 3; i++) {
 591                   value[i] = ctx->Light.Light[ln].Diffuse[i] *
 592                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][i];
 593                }
 594                /* [3] = material alpha */
 595                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 596                return;
 597             case STATE_SPECULAR:
 598                for (i = 0; i < 3; i++) {
 599                   value[i] = ctx->Light.Light[ln].Specular[i] *
 600                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][i];
 601                }
 602                /* [3] = material alpha */
 603                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 604                return;
 605             default:
 606                _mesa_problem(ctx, "Invalid lightprod state in fetch_state");
 607                return;
 608          }
 609       }
 610       return;
 611    case STATE_TEXGEN:
 612       {
 613          /* state[1] is the texture unit */
 614          const GLuint unit = (GLuint) state[1];
 615          /* state[2] is the texgen attribute */
 616          switch (state[2]) {
 617          case STATE_TEXGEN_EYE_S:
 618             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneS);
 619             return;
 620          case STATE_TEXGEN_EYE_T:
 621             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneT);
 622             return;
 623          case STATE_TEXGEN_EYE_R:
 624             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneR);
 625             return;
 626          case STATE_TEXGEN_EYE_Q:
 627             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneQ);
 628             return;
 629          case STATE_TEXGEN_OBJECT_S:
 630             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneS);
 631             return;
 632          case STATE_TEXGEN_OBJECT_T:
 633             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneT);
 634             return;
 635          case STATE_TEXGEN_OBJECT_R:
 636             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneR);
 637             return;
 638          case STATE_TEXGEN_OBJECT_Q:
 639             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneQ);
 640             return;
 641          default:
 642             _mesa_problem(ctx, "Invalid texgen state in fetch_state");
 643             return;
 644          }
 645       }
 646       return;
 647    case STATE_TEXENV_COLOR:
 648       {
 649          /* state[1] is the texture unit */
 650          const GLuint unit = (GLuint) state[1];
 651          COPY_4V(value, ctx->Texture.Unit[unit].EnvColor);
 652       }
 653       return;
 654    case STATE_FOG_COLOR:
 655       COPY_4V(value, ctx->Fog.Color);
 656       return;
 657    case STATE_FOG_PARAMS:
 658       value[0] = ctx->Fog.Density;
 659       value[1] = ctx->Fog.Start;
 660       value[2] = ctx->Fog.End;
 661       value[3] = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
 662       return;
 663    case STATE_CLIPPLANE:
 664       {
 665          const GLuint plane = (GLuint) state[1];
 666          COPY_4V(value, ctx->Transform.EyeUserPlane[plane]);
 667       }
 668       return;
 669    case STATE_POINT_SIZE:
 670       value[0] = ctx->Point.Size;
 671       value[1] = ctx->Point.MinSize;
 672       value[2] = ctx->Point.MaxSize;
 673       value[3] = ctx->Point.Threshold;
 674       return;
 675    case STATE_POINT_ATTENUATION:
 676       value[0] = ctx->Point.Params[0];
 677       value[1] = ctx->Point.Params[1];
 678       value[2] = ctx->Point.Params[2];
 679       value[3] = 1.0F;
 680       return;
 681    case STATE_MATRIX:
 682       {
 683          /* state[1] = modelview, projection, texture, etc. */
 684          /* state[2] = which texture matrix or program matrix */
 685          /* state[3] = first column to fetch */
 686          /* state[4] = last column to fetch */
 687          /* state[5] = transpose, inverse or invtrans */
 688
 689          const GLmatrix *matrix;
 690          const enum state_index mat = state[1];
 691          const GLuint index = (GLuint) state[2];
 692          const GLuint first = (GLuint) state[3];
 693          const GLuint last = (GLuint) state[4];
 694          const enum state_index modifier = state[5];
 695          const GLfloat *m;
 696          GLuint row, i;
 697          if (mat == STATE_MODELVIEW) {
 698             matrix = ctx->ModelviewMatrixStack.Top;
 699          }
 700          else if (mat == STATE_PROJECTION) {
 701             matrix = ctx->ProjectionMatrixStack.Top;
 702          }
 703          else if (mat == STATE_MVP) {
 704             matrix = &ctx->_ModelProjectMatrix;
 705          }
 706          else if (mat == STATE_TEXTURE) {
 707             matrix = ctx->TextureMatrixStack[index].Top;
 708          }
 709          else if (mat == STATE_PROGRAM) {
 710             matrix = ctx->ProgramMatrixStack[index].Top;
 711          }
 712          else {
 713             _mesa_problem(ctx, "Bad matrix name in _mesa_fetch_state()");
 714             return;
 715          }
 716          if (modifier == STATE_MATRIX_INVERSE ||
 717              modifier == STATE_MATRIX_INVTRANS) {
 718             /* XXX be sure inverse is up to date */
 719             m = matrix->inv;
 720          }
 721          else {
 722             m = matrix->m;
 723          }
 724          if (modifier == STATE_MATRIX_TRANSPOSE ||
 725              modifier == STATE_MATRIX_INVTRANS) {
 726             for (i = 0, row = first; row <= last; row++) {
 727                value[i++] = m[row * 4 + 0];
 728                value[i++] = m[row * 4 + 1];
 729                value[i++] = m[row * 4 + 2];
 730                value[i++] = m[row * 4 + 3];
 731             }
 732          }
 733          else {
 734             for (i = 0, row = first; row <= last; row++) {
 735                value[i++] = m[row + 0];
 736                value[i++] = m[row + 4];
 737                value[i++] = m[row + 8];
 738                value[i++] = m[row + 12];
 739             }
 740          }
 741       }
 742       return;
 743    case STATE_DEPTH_RANGE:
 744       value[0] = ctx->Viewport.Near;                     /* near       */
 745       value[1] = ctx->Viewport.Far;                      /* far        */
 746       value[2] = ctx->Viewport.Far - ctx->Viewport.Near; /* far - near */
 747       value[3] = 0;
 748       return;
 749    case STATE_FRAGMENT_PROGRAM:
 750       {
 751          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 752          /* state[2] = parameter index          */
 753          int idx = state[2];
 754
 755          switch (state[1]) {
 756             case STATE_ENV:
 757                COPY_4V(value, ctx->FragmentProgram.Parameters[idx]);
 758                break;
 759
 760             case STATE_LOCAL:
 761                COPY_4V(value, ctx->FragmentProgram.Current->Base.LocalParams[idx]);
 762                break;
 763             default:
 764                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 765                return;
 766          }
 767       }
 768       return;
 769
 770    case STATE_VERTEX_PROGRAM:
 771       {
 772          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 773          /* state[2] = parameter index          */
 774          int idx = state[2];
 775
 776          switch (state[1]) {
 777             case STATE_ENV:
 778                COPY_4V(value, ctx->VertexProgram.Parameters[idx]);
 779                break;
 780
 781             case STATE_LOCAL:
 782                COPY_4V(value, ctx->VertexProgram.Current->Base.LocalParams[idx]);
 783                break;
 784             default:
 785                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 786                return;
 787          }
 788       }
 789       return;
 790    default:
 791       _mesa_problem(ctx, "Invalid state in fetch_state");
 792       return;
 793    }
 794 }
 795
 796
 797 /**
 798  * Loop over all the parameters in a parameter list.  If the parameter
 799  * is a GL state reference, look up the current value of that state
 800  * variable and put it into the parameter's Value[4] array.
 801  * This would be called at glBegin time when using a fragment program.
 802  */
 803 void
 804 _mesa_load_state_parameters(GLcontext *ctx,
 805                             struct program_parameter_list *paramList)
 806 {
 807    GLuint i;
 808
 809    if (!paramList)
 810       return;
 811
 812    for (i = 0; i < paramList->NumParameters; i++) {
 813       if (paramList->Parameters[i].Type == STATE) {
 814          _mesa_fetch_state(ctx, paramList->Parameters[i].StateIndexes,
 815                            paramList->Parameters[i].Values);
 816       }
 817    }
 818 }
 819
 820
 821
 822 /**********************************************************************/
 823 /* API functions                                                      */
 824 /**********************************************************************/
 825
 826
 827 /**
 828  * Bind a program (make it current)
 829  * \note Called from the GL API dispatcher by both glBindProgramNV
 830  * and glBindProgramARB.
 831  */
 832 void GLAPIENTRY
 833 _mesa_BindProgram(GLenum target, GLuint id)
 834 {
 835    struct program *prog;
 836    GET_CURRENT_CONTEXT(ctx);
 837    ASSERT_OUTSIDE_BEGIN_END(ctx);
 838
 839    FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 840
 841    if ((target == GL_VERTEX_PROGRAM_NV
 842         && ctx->Extensions.NV_vertex_program) ||
 843        (target == GL_VERTEX_PROGRAM_ARB
 844         && ctx->Extensions.ARB_vertex_program)) {
 845       if (ctx->VertexProgram.Current &&
 846           ctx->VertexProgram.Current->Base.Id == id)
 847          return;
 848       /* decrement refcount on previously bound vertex program */
 849       if (ctx->VertexProgram.Current) {
 850          ctx->VertexProgram.Current->Base.RefCount--;
 851          /* and delete if refcount goes below one */
 852          if (ctx->VertexProgram.Current->Base.RefCount <= 0) {
 853             ctx->Driver.DeleteProgram(ctx, &(ctx->VertexProgram.Current->Base));
 854             _mesa_HashRemove(ctx->Shared->Programs, id);
 855          }
 856       }
 857    }
 858    else if ((target == GL_FRAGMENT_PROGRAM_NV
 859              && ctx->Extensions.NV_fragment_program) ||
 860             (target == GL_FRAGMENT_PROGRAM_ARB
 861              && ctx->Extensions.ARB_fragment_program)) {
 862       if (ctx->FragmentProgram.Current &&
 863           ctx->FragmentProgram.Current->Base.Id == id)
 864          return;
 865       /* decrement refcount on previously bound fragment program */
 866       if (ctx->FragmentProgram.Current) {
 867          ctx->FragmentProgram.Current->Base.RefCount--;
 868          /* and delete if refcount goes below one */
 869          if (ctx->FragmentProgram.Current->Base.RefCount <= 0) {
 870             ctx->Driver.DeleteProgram(ctx, &(ctx->FragmentProgram.Current->Base));
 871             _mesa_HashRemove(ctx->Shared->Programs, id);
 872          }
 873       }
 874    }
 875    else {
 876       _mesa_error(ctx, GL_INVALID_ENUM, "glBindProgramNV/ARB(target)");
 877       return;
 878    }
 879
 880    /* NOTE: binding to a non-existant program is not an error.
 881     * That's supposed to be caught in glBegin.
 882     */
 883    if (id == 0) {
 884       /* default program */
 885       prog = NULL;
 886       if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB)
 887          prog = ctx->Shared->DefaultVertexProgram;
 888       else
 889          prog = ctx->Shared->DefaultFragmentProgram;
 890    }
 891    else {
 892       prog = (struct program *) _mesa_HashLookup(ctx->Shared->Programs, id);
 893       if (prog) {
 894          if (prog->Target == 0) {
 895             /* prog was allocated with glGenProgramsNV */
 896             prog->Target = target;
 897          }
 898          else if (prog->Target != target) {
 899             _mesa_error(ctx, GL_INVALID_OPERATION,
 900                         "glBindProgramNV/ARB(target mismatch)");
 901             return;
 902          }
 903       }
 904       else {
 905          /* allocate a new program now */
 906          prog = ctx->Driver.NewProgram(ctx, target, id);
 907          if (!prog) {
 908             _mesa_error(ctx, GL_OUT_OF_MEMORY, "glBindProgramNV/ARB");
 909             return;
 910          }
 911          prog->Id = id;
 912          prog->Target = target;
 913          prog->Resident = GL_TRUE;
 914          prog->RefCount = 1;
 915          _mesa_HashInsert(ctx->Shared->Programs, id, prog);
 916       }
 917    }
 918
 919    /* bind now */
 920    if (target == GL_VERTEX_PROGRAM_NV || target == GL_VERTEX_PROGRAM_ARB) {
 921       ctx->VertexProgram.Current = (struct vertex_program *) prog;
 922    }
 923    else if (target == GL_FRAGMENT_PROGRAM_NV || target == GL_FRAGMENT_PROGRAM_ARB) {
 924       ctx->FragmentProgram.Current = (struct fragment_program *) prog;
 925    }
 926
 927    if (prog)
 928       prog->RefCount++;
 929
 930    if (ctx->Driver.BindProgram)
 931       ctx->Driver.BindProgram(ctx, target, prog);
 932 }
 933
 934
 935 /**
 936  * Delete a list of programs.
 937  * \note Not compiled into display lists.
 938  * \note Called by both glDeleteProgramsNV and glDeleteProgramsARB.
 939  */
 940 void GLAPIENTRY
 941 _mesa_DeletePrograms(GLsizei n, const GLuint *ids)
 942 {
 943    GLint i;
 944    GET_CURRENT_CONTEXT(ctx);
 945    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
 946
 947    if (n < 0) {
 948       _mesa_error( ctx, GL_INVALID_VALUE, "glDeleteProgramsNV" );
 949       return;
 950    }
 951
 952    for (i = 0; i < n; i++) {
 953       if (ids[i] != 0) {
 954          struct program *prog = (struct program *)
 955             _mesa_HashLookup(ctx->Shared->Programs, ids[i]);
 956          if (prog) {
 957             if (prog->Target == GL_VERTEX_PROGRAM_NV ||
 958                 prog->Target == GL_VERTEX_STATE_PROGRAM_NV) {
 959                if (ctx->VertexProgram.Current &&
 960                    ctx->VertexProgram.Current->Base.Id == ids[i]) {
 961                   /* unbind this currently bound program */
 962                   _mesa_BindProgram(prog->Target, 0);
 963                }
 964             }
 965             else if (prog->Target == GL_FRAGMENT_PROGRAM_NV ||
 966                      prog->Target == GL_FRAGMENT_PROGRAM_ARB) {
 967                if (ctx->FragmentProgram.Current &&
 968                    ctx->FragmentProgram.Current->Base.Id == ids[i]) {
 969                   /* unbind this currently bound program */
 970                   _mesa_BindProgram(prog->Target, 0);
 971                }
 972             }
 973             else {
 974                _mesa_problem(ctx, "bad target in glDeleteProgramsNV");
 975                return;
 976             }
 977             prog->RefCount--;
 978             if (prog->RefCount <= 0) {
 979                ctx->Driver.DeleteProgram(ctx, prog);
 980             }
 981          }
 982          else {
 983             /* This is necessary as we can't tell from HashLookup
 984              * whether the entry exists with data == 0, or if it
 985              * doesn't exist at all.  As GenPrograms creates the first
 986              * case below, need to call Remove() to avoid memory leak:
 987              */
 988             _mesa_HashRemove(ctx->Shared->Programs, ids[i]);
 989          }
 990       }
 991    }
 992 }
 993
 994
 995 /**
 996  * Generate a list of new program identifiers.
 997  * \note Not compiled into display lists.
 998  * \note Called by both glGenProgramsNV and glGenProgramsARB.
 999  */
1000 void GLAPIENTRY
1001 _mesa_GenPrograms(GLsizei n, GLuint *ids)
1002 {
1003    GLuint first;
1004    GLuint i;
1005    GET_CURRENT_CONTEXT(ctx);
1006    ASSERT_OUTSIDE_BEGIN_END(ctx);
1007
1008    if (n < 0) {
1009       _mesa_error(ctx, GL_INVALID_VALUE, "glGenPrograms");
1010       return;
1011    }
1012
1013    if (!ids)
1014       return;
1015
1016    first = _mesa_HashFindFreeKeyBlock(ctx->Shared->Programs, n);
1017
1018    for (i = 0; i < (GLuint) n; i++) {
1019       _mesa_HashInsert(ctx->Shared->Programs, first + i, 0);
1020    }
1021
1022    /* Return the program names */
1023    for (i = 0; i < (GLuint) n; i++) {
1024       ids[i] = first + i;
1025    }
1026 }
1027
1028
1029 /**
1030  * Determine if id names a program.
1031  * \note Not compiled into display lists.
1032  * \note Called from both glIsProgramNV and glIsProgramARB.
1033  * \param id is the program identifier
1034  * \return GL_TRUE if id is a program, else GL_FALSE.
1035  */
1036 GLboolean GLAPIENTRY
1037 _mesa_IsProgram(GLuint id)
1038 {
1039    GET_CURRENT_CONTEXT(ctx);
1040    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, GL_FALSE);
1041
1042    if (id == 0)
1043       return GL_FALSE;
1044
1045    if (_mesa_HashLookup(ctx->Shared->Programs, id))
1046       return GL_TRUE;
1047    else
1048       return GL_FALSE;
1049 }
1050
1051
1052
1053 /**********************************************************************/
1054 /* GL_MESA_program_debug extension                                    */
1055 /**********************************************************************/
1056
1057
1058 /* XXX temporary */
1059 void
1060 glProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
1061                       GLvoid *data)
1062 {
1063    _mesa_ProgramCallbackMESA(target, callback, data);
1064 }
1065
1066
1067 void
1068 _mesa_ProgramCallbackMESA(GLenum target, GLprogramcallbackMESA callback,
1069                           GLvoid *data)
1070 {
1071    GET_CURRENT_CONTEXT(ctx);
1072
1073    switch (target) {
1074       case GL_FRAGMENT_PROGRAM_ARB:
1075          if (!ctx->Extensions.ARB_fragment_program) {
1076             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1077             return;
1078          }
1079          ctx->FragmentProgram.Callback = callback;
1080          ctx->FragmentProgram.CallbackData = data;
1081          break;
1082       case GL_FRAGMENT_PROGRAM_NV:
1083          if (!ctx->Extensions.NV_fragment_program) {
1084             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1085             return;
1086          }
1087          ctx->FragmentProgram.Callback = callback;
1088          ctx->FragmentProgram.CallbackData = data;
1089          break;
1090       case GL_VERTEX_PROGRAM_ARB: /* == GL_VERTEX_PROGRAM_NV */
1091          if (!ctx->Extensions.ARB_vertex_program &&
1092              !ctx->Extensions.NV_vertex_program) {
1093             _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1094             return;
1095          }
1096          ctx->VertexProgram.Callback = callback;
1097          ctx->VertexProgram.CallbackData = data;
1098          break;
1099       default:
1100          _mesa_error(ctx, GL_INVALID_ENUM, "glProgramCallbackMESA(target)");
1101          return;
1102    }
1103 }
1104
1105
1106 /* XXX temporary */
1107 void
1108 glGetProgramRegisterfvMESA(GLenum target,
1109                            GLsizei len, const GLubyte *registerName,
1110                            GLfloat *v)
1111 {
1112    _mesa_GetProgramRegisterfvMESA(target, len, registerName, v);
1113 }
1114
1115
1116 void
1117 _mesa_GetProgramRegisterfvMESA(GLenum target,
1118                                GLsizei len, const GLubyte *registerName,
1119                                GLfloat *v)
1120 {
1121    char reg[1000];
1122    GET_CURRENT_CONTEXT(ctx);
1123
1124    /* We _should_ be inside glBegin/glEnd */
1125 #if 0
1126    if (ctx->Driver.CurrentExecPrimitive == PRIM_OUTSIDE_BEGIN_END) {
1127       _mesa_error(ctx, GL_INVALID_OPERATION, "glGetProgramRegisterfvMESA");
1128       return;
1129    }
1130 #endif
1131
1132    /* make null-terminated copy of registerName */
1133    len = MIN2((unsigned int) len, sizeof(reg) - 1);
1134    _mesa_memcpy(reg, registerName, len);
1135    reg[len] = 0;
1136
1137    switch (target) {
1138       case GL_VERTEX_PROGRAM_NV:
1139          if (!ctx->Extensions.ARB_vertex_program &&
1140              !ctx->Extensions.NV_vertex_program) {
1141             _mesa_error(ctx, GL_INVALID_ENUM,
1142                         "glGetProgramRegisterfvMESA(target)");
1143             return;
1144          }
1145          if (!ctx->VertexProgram.Enabled) {
1146             _mesa_error(ctx, GL_INVALID_OPERATION,
1147                         "glGetProgramRegisterfvMESA");
1148             return;
1149          }
1150          /* GL_NV_vertex_program */
1151          if (reg[0] == 'R') {
1152             /* Temp register */
1153             GLint i = _mesa_atoi(reg + 1);
1154             if (i >= (GLint)ctx->Const.MaxVertexProgramTemps) {
1155                _mesa_error(ctx, GL_INVALID_VALUE,
1156                            "glGetProgramRegisterfvMESA(registerName)");
1157                return;
1158             }
1159             COPY_4V(v, ctx->VertexProgram.Temporaries[i]);
1160          }
1161          else if (reg[0] == 'v' && reg[1] == '[') {
1162             /* Vertex Input attribute */
1163             GLuint i;
1164             for (i = 0; i < ctx->Const.MaxVertexProgramAttribs; i++) {
1165                const char *name = _mesa_nv_vertex_input_register_name(i);
1166                char number[10];
1167                sprintf(number, "%d", i);
1168                if (_mesa_strncmp(reg + 2, name, 4) == 0 ||
1169                    _mesa_strncmp(reg + 2, number, _mesa_strlen(number)) == 0) {
1170                   COPY_4V(v, ctx->VertexProgram.Inputs[i]);
1171                   return;
1172                }
1173             }
1174             _mesa_error(ctx, GL_INVALID_VALUE,
1175                         "glGetProgramRegisterfvMESA(registerName)");
1176             return;
1177          }
1178          else if (reg[0] == 'o' && reg[1] == '[') {
1179             /* Vertex output attribute */
1180          }
1181          /* GL_ARB_vertex_program */
1182          else if (_mesa_strncmp(reg, "vertex.", 7) == 0) {
1183
1184          }
1185          else {
1186             _mesa_error(ctx, GL_INVALID_VALUE,
1187                         "glGetProgramRegisterfvMESA(registerName)");
1188             return;
1189          }
1190          break;
1191       case GL_FRAGMENT_PROGRAM_ARB:
1192          if (!ctx->Extensions.ARB_fragment_program) {
1193             _mesa_error(ctx, GL_INVALID_ENUM,
1194                         "glGetProgramRegisterfvMESA(target)");
1195             return;
1196          }
1197          if (!ctx->FragmentProgram.Enabled) {
1198             _mesa_error(ctx, GL_INVALID_OPERATION,
1199                         "glGetProgramRegisterfvMESA");
1200             return;
1201          }
1202          /* XXX to do */
1203          break;
1204       case GL_FRAGMENT_PROGRAM_NV:
1205          if (!ctx->Extensions.NV_fragment_program) {
1206             _mesa_error(ctx, GL_INVALID_ENUM,
1207                         "glGetProgramRegisterfvMESA(target)");
1208             return;
1209          }
1210          if (!ctx->FragmentProgram.Enabled) {
1211             _mesa_error(ctx, GL_INVALID_OPERATION,
1212                         "glGetProgramRegisterfvMESA");
1213             return;
1214          }
1215          if (reg[0] == 'R') {
1216             /* Temp register */
1217             GLint i = _mesa_atoi(reg + 1);
1218             if (i >= (GLint)ctx->Const.MaxFragmentProgramTemps) {
1219                _mesa_error(ctx, GL_INVALID_VALUE,
1220                            "glGetProgramRegisterfvMESA(registerName)");
1221                return;
1222             }
1223             COPY_4V(v, ctx->FragmentProgram.Machine.Temporaries[i]);
1224          }
1225          else if (reg[0] == 'f' && reg[1] == '[') {
1226             /* Fragment input attribute */
1227             GLuint i;
1228             for (i = 0; i < ctx->Const.MaxFragmentProgramAttribs; i++) {
1229                const char *name = _mesa_nv_fragment_input_register_name(i);
1230                if (_mesa_strncmp(reg + 2, name, 4) == 0) {
1231                   COPY_4V(v, ctx->FragmentProgram.Machine.Inputs[i]);
1232                   return;
1233                }
1234             }
1235             _mesa_error(ctx, GL_INVALID_VALUE,
1236                         "glGetProgramRegisterfvMESA(registerName)");
1237             return;
1238          }
1239          else if (_mesa_strcmp(reg, "o[COLR]") == 0) {
1240             /* Fragment output color */
1241             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLR]);
1242          }
1243          else if (_mesa_strcmp(reg, "o[COLH]") == 0) {
1244             /* Fragment output color */
1245             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_COLH]);
1246          }
1247          else if (_mesa_strcmp(reg, "o[DEPR]") == 0) {
1248             /* Fragment output depth */
1249             COPY_4V(v, ctx->FragmentProgram.Machine.Outputs[FRAG_OUTPUT_DEPR]);
1250          }
1251          else {
1252             /* try user-defined identifiers */
1253             const GLfloat *value = _mesa_lookup_parameter_value(
1254                        ctx->FragmentProgram.Current->Parameters, -1, reg);
1255             if (value) {
1256                COPY_4V(v, value);
1257             }
1258             else {
1259                _mesa_error(ctx, GL_INVALID_VALUE,
1260                            "glGetProgramRegisterfvMESA(registerName)");
1261                return;
1262             }
1263          }
1264          break;
1265       default:
1266          _mesa_error(ctx, GL_INVALID_ENUM,
1267                      "glGetProgramRegisterfvMESA(target)");
1268          return;
1269    }
1270
1271 }