src/mesa/shader/prog_statevars.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.3
   4  *
   5  * Copyright (C) 1999-2007  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 prog_statevars.c
  27  * Program state variable management.
  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 "prog_statevars.h"
  39 #include "prog_parameter.h"
  40 #include "nvvertparse.h"
  41
  42
  43 /**
  44  * Use the list of tokens in the state[] array to find global GL state
  45  * and return it in <value>.  Usually, four values are returned in <value>
  46  * but matrix queries may return as many as 16 values.
  47  * This function is used for ARB vertex/fragment programs.
  48  * The program parser will produce the state[] values.
  49  */
  50 static void
  51 _mesa_fetch_state(GLcontext *ctx, const gl_state_index state[],
  52                   GLfloat *value)
  53 {
  54    switch (state[0]) {
  55    case STATE_MATERIAL:
  56       {
  57          /* state[1] is either 0=front or 1=back side */
  58          const GLuint face = (GLuint) state[1];
  59          const struct gl_material *mat = &ctx->Light.Material;
  60          ASSERT(face == 0 || face == 1);
  61          /* we rely on tokens numbered so that _BACK_ == _FRONT_+ 1 */
  62          ASSERT(MAT_ATTRIB_FRONT_AMBIENT + 1 == MAT_ATTRIB_BACK_AMBIENT);
  63          /* XXX we could get rid of this switch entirely with a little
  64           * work in arbprogparse.c's parse_state_single_item().
  65           */
  66          /* state[2] is the material attribute */
  67          switch (state[2]) {
  68          case STATE_AMBIENT:
  69             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_AMBIENT + face]);
  70             return;
  71          case STATE_DIFFUSE:
  72             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_DIFFUSE + face]);
  73             return;
  74          case STATE_SPECULAR:
  75             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_SPECULAR + face]);
  76             return;
  77          case STATE_EMISSION:
  78             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_EMISSION + face]);
  79             return;
  80          case STATE_SHININESS:
  81             value[0] = mat->Attrib[MAT_ATTRIB_FRONT_SHININESS + face][0];
  82             value[1] = 0.0F;
  83             value[2] = 0.0F;
  84             value[3] = 1.0F;
  85             return;
  86          default:
  87             _mesa_problem(ctx, "Invalid material state in fetch_state");
  88             return;
  89          }
  90       }
  91    case STATE_LIGHT:
  92       {
  93          /* state[1] is the light number */
  94          const GLuint ln = (GLuint) state[1];
  95          /* state[2] is the light attribute */
  96          switch (state[2]) {
  97          case STATE_AMBIENT:
  98             COPY_4V(value, ctx->Light.Light[ln].Ambient);
  99             return;
 100          case STATE_DIFFUSE:
 101             COPY_4V(value, ctx->Light.Light[ln].Diffuse);
 102             return;
 103          case STATE_SPECULAR:
 104             COPY_4V(value, ctx->Light.Light[ln].Specular);
 105             return;
 106          case STATE_POSITION:
 107             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 108             return;
 109          case STATE_ATTENUATION:
 110             value[0] = ctx->Light.Light[ln].ConstantAttenuation;
 111             value[1] = ctx->Light.Light[ln].LinearAttenuation;
 112             value[2] = ctx->Light.Light[ln].QuadraticAttenuation;
 113             value[3] = ctx->Light.Light[ln].SpotExponent;
 114             return;
 115          case STATE_SPOT_DIRECTION:
 116             COPY_3V(value, ctx->Light.Light[ln].EyeDirection);
 117             value[3] = ctx->Light.Light[ln]._CosCutoff;
 118             return;
 119          case STATE_SPOT_CUTOFF:
 120             value[0] = ctx->Light.Light[ln].SpotCutoff;
 121             return;
 122          case STATE_HALF_VECTOR:
 123             {
 124                GLfloat eye_z[] = {0, 0, 1};
 125
 126                /* Compute infinite half angle vector:
 127                 *   half-vector = light_position + (0, 0, 1)
 128                 * and then normalize.  w = 0
 129                 *
 130                 * light.EyePosition.w should be 0 for infinite lights.
 131                 */
 132                ADD_3V(value, eye_z, ctx->Light.Light[ln].EyePosition);
 133                NORMALIZE_3FV(value);
 134                value[3] = 0;
 135             }
 136             return;
 137          case STATE_POSITION_NORMALIZED:
 138             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 139             NORMALIZE_3FV( value );
 140             return;
 141          default:
 142             _mesa_problem(ctx, "Invalid light state in fetch_state");
 143             return;
 144          }
 145       }
 146    case STATE_LIGHTMODEL_AMBIENT:
 147       COPY_4V(value, ctx->Light.Model.Ambient);
 148       return;
 149    case STATE_LIGHTMODEL_SCENECOLOR:
 150       if (state[1] == 0) {
 151          /* front */
 152          GLint i;
 153          for (i = 0; i < 3; i++) {
 154             value[i] = ctx->Light.Model.Ambient[i]
 155                * ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT][i]
 156                + ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION][i];
 157          }
 158          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
 159       }
 160       else {
 161          /* back */
 162          GLint i;
 163          for (i = 0; i < 3; i++) {
 164             value[i] = ctx->Light.Model.Ambient[i]
 165                * ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT][i]
 166                + ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION][i];
 167          }
 168          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
 169       }
 170       return;
 171    case STATE_LIGHTPROD:
 172       {
 173          const GLuint ln = (GLuint) state[1];
 174          const GLuint face = (GLuint) state[2];
 175          GLint i;
 176          ASSERT(face == 0 || face == 1);
 177          switch (state[3]) {
 178             case STATE_AMBIENT:
 179                for (i = 0; i < 3; i++) {
 180                   value[i] = ctx->Light.Light[ln].Ambient[i] *
 181                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][i];
 182                }
 183                /* [3] = material alpha */
 184                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 185                return;
 186             case STATE_DIFFUSE:
 187                for (i = 0; i < 3; i++) {
 188                   value[i] = ctx->Light.Light[ln].Diffuse[i] *
 189                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][i];
 190                }
 191                /* [3] = material alpha */
 192                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 193                return;
 194             case STATE_SPECULAR:
 195                for (i = 0; i < 3; i++) {
 196                   value[i] = ctx->Light.Light[ln].Specular[i] *
 197                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][i];
 198                }
 199                /* [3] = material alpha */
 200                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 201                return;
 202             default:
 203                _mesa_problem(ctx, "Invalid lightprod state in fetch_state");
 204                return;
 205          }
 206       }
 207    case STATE_TEXGEN:
 208       {
 209          /* state[1] is the texture unit */
 210          const GLuint unit = (GLuint) state[1];
 211          /* state[2] is the texgen attribute */
 212          switch (state[2]) {
 213          case STATE_TEXGEN_EYE_S:
 214             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneS);
 215             return;
 216          case STATE_TEXGEN_EYE_T:
 217             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneT);
 218             return;
 219          case STATE_TEXGEN_EYE_R:
 220             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneR);
 221             return;
 222          case STATE_TEXGEN_EYE_Q:
 223             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneQ);
 224             return;
 225          case STATE_TEXGEN_OBJECT_S:
 226             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneS);
 227             return;
 228          case STATE_TEXGEN_OBJECT_T:
 229             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneT);
 230             return;
 231          case STATE_TEXGEN_OBJECT_R:
 232             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneR);
 233             return;
 234          case STATE_TEXGEN_OBJECT_Q:
 235             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneQ);
 236             return;
 237          default:
 238             _mesa_problem(ctx, "Invalid texgen state in fetch_state");
 239             return;
 240          }
 241       }
 242    case STATE_TEXENV_COLOR:
 243       {
 244          /* state[1] is the texture unit */
 245          const GLuint unit = (GLuint) state[1];
 246          COPY_4V(value, ctx->Texture.Unit[unit].EnvColor);
 247       }
 248       return;
 249    case STATE_FOG:
 250       if (state[1] == STATE_FOG_COLOR) {
 251          COPY_4V(value, ctx->Fog.Color);
 252       }
 253       else {
 254          ASSERT(state[1] == STATE_FOG_PARAMS);
 255          value[0] = ctx->Fog.Density;
 256          value[1] = ctx->Fog.Start;
 257          value[2] = ctx->Fog.End;
 258          value[3] = 1.0F / (ctx->Fog.End - ctx->Fog.Start);
 259       }
 260       return;
 261    case STATE_CLIPPLANE:
 262       {
 263          const GLuint plane = (GLuint) state[1];
 264          COPY_4V(value, ctx->Transform.EyeUserPlane[plane]);
 265       }
 266       return;
 267    case STATE_POINT:
 268       if (state[1] == STATE_POINT_SIZE) {
 269          value[0] = ctx->Point.Size;
 270          value[1] = ctx->Point.MinSize;
 271          value[2] = ctx->Point.MaxSize;
 272          value[3] = ctx->Point.Threshold;
 273       }
 274       else {
 275          ASSERT(state[1] == STATE_POINT_ATTENUATION);
 276          value[0] = ctx->Point.Params[0];
 277          value[1] = ctx->Point.Params[1];
 278          value[2] = ctx->Point.Params[2];
 279          value[3] = 1.0F;
 280       }
 281       return;
 282    case STATE_MODELVIEW_MATRIX:
 283    case STATE_PROJECTION_MATRIX:
 284    case STATE_MVP_MATRIX:
 285    case STATE_TEXTURE_MATRIX:
 286    case STATE_PROGRAM_MATRIX:
 287       /*case STATE_MATRIX:*/
 288       {
 289          /* state[1] = modelview, projection, texture, etc. */
 290          /* state[2] = which texture matrix or program matrix */
 291          /* state[3] = first row to fetch */
 292          /* state[4] = last row to fetch */
 293          /* state[5] = transpose, inverse or invtrans */
 294
 295          const GLmatrix *matrix;
 296 #if 0
 297          const gl_state_index mat = state[1];
 298          const GLuint index = (GLuint) state[2];
 299          const GLuint firstRow = (GLuint) state[3];
 300          const GLuint lastRow = (GLuint) state[4];
 301          const gl_state_index modifier = state[5];
 302 #else
 303          const gl_state_index mat = state[0];
 304          const GLuint index = (GLuint) state[1];
 305          const GLuint firstRow = (GLuint) state[2];
 306          const GLuint lastRow = (GLuint) state[3];
 307          const gl_state_index modifier = state[4];
 308 #endif
 309          const GLfloat *m;
 310          GLuint row, i;
 311          ASSERT(firstRow >= 0);
 312          ASSERT(firstRow < 4);
 313          ASSERT(lastRow >= 0);
 314          ASSERT(lastRow < 4);
 315          if (mat == STATE_MODELVIEW_MATRIX) {
 316             matrix = ctx->ModelviewMatrixStack.Top;
 317          }
 318          else if (mat == STATE_PROJECTION_MATRIX) {
 319             matrix = ctx->ProjectionMatrixStack.Top;
 320          }
 321          else if (mat == STATE_MVP_MATRIX) {
 322             matrix = &ctx->_ModelProjectMatrix;
 323          }
 324          else if (mat == STATE_TEXTURE_MATRIX) {
 325             matrix = ctx->TextureMatrixStack[index].Top;
 326          }
 327          else if (mat == STATE_PROGRAM_MATRIX) {
 328             matrix = ctx->ProgramMatrixStack[index].Top;
 329          }
 330          else {
 331             _mesa_problem(ctx, "Bad matrix name in _mesa_fetch_state()");
 332             return;
 333          }
 334          if (modifier == STATE_MATRIX_INVERSE ||
 335              modifier == STATE_MATRIX_INVTRANS) {
 336             /* Be sure inverse is up to date:
 337              */
 338             _math_matrix_alloc_inv( (GLmatrix *) matrix );
 339             _math_matrix_analyse( (GLmatrix*) matrix );
 340             m = matrix->inv;
 341          }
 342          else {
 343             m = matrix->m;
 344          }
 345          if (modifier == STATE_MATRIX_TRANSPOSE ||
 346              modifier == STATE_MATRIX_INVTRANS) {
 347             for (i = 0, row = firstRow; row <= lastRow; row++) {
 348                value[i++] = m[row * 4 + 0];
 349                value[i++] = m[row * 4 + 1];
 350                value[i++] = m[row * 4 + 2];
 351                value[i++] = m[row * 4 + 3];
 352             }
 353          }
 354          else {
 355             for (i = 0, row = firstRow; row <= lastRow; row++) {
 356                value[i++] = m[row + 0];
 357                value[i++] = m[row + 4];
 358                value[i++] = m[row + 8];
 359                value[i++] = m[row + 12];
 360             }
 361          }
 362       }
 363       return;
 364    case STATE_DEPTH_RANGE:
 365       value[0] = ctx->Viewport.Near;                     /* near       */
 366       value[1] = ctx->Viewport.Far;                      /* far        */
 367       value[2] = ctx->Viewport.Far - ctx->Viewport.Near; /* far - near */
 368       value[3] = 0;
 369       return;
 370    case STATE_FRAGMENT_PROGRAM:
 371       {
 372          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 373          /* state[2] = parameter index          */
 374          const int idx = (int) state[2];
 375          switch (state[1]) {
 376             case STATE_ENV:
 377                COPY_4V(value, ctx->FragmentProgram.Parameters[idx]);
 378                break;
 379             case STATE_LOCAL:
 380                COPY_4V(value, ctx->FragmentProgram.Current->Base.LocalParams[idx]);
 381                break;
 382             default:
 383                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 384                return;
 385          }
 386       }
 387       return;
 388
 389    case STATE_VERTEX_PROGRAM:
 390       {
 391          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 392          /* state[2] = parameter index          */
 393          const int idx = (int) state[2];
 394          switch (state[1]) {
 395             case STATE_ENV:
 396                COPY_4V(value, ctx->VertexProgram.Parameters[idx]);
 397                break;
 398             case STATE_LOCAL:
 399                COPY_4V(value, ctx->VertexProgram.Current->Base.LocalParams[idx]);
 400                break;
 401             default:
 402                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 403                return;
 404          }
 405       }
 406       return;
 407
 408    case STATE_NORMAL_SCALE:
 409       ASSIGN_4V(value, ctx->_ModelViewInvScale, 0, 0, 1);
 410       return;
 411
 412    case STATE_INTERNAL:
 413       {
 414          switch (state[1]) {
 415             case STATE_TEXRECT_SCALE: {
 416                const int unit = (int) state[2];
 417                const struct gl_texture_object *texObj = ctx->Texture.Unit[unit]._Current;
 418                if (texObj) {
 419                   struct gl_texture_image *texImage = texObj->Image[0][0];
 420                   ASSIGN_4V(value, 1.0 / texImage->Width, 1.0 / texImage->Height, 0, 1);
 421                }
 422                break;
 423             }
 424             default:
 425                /* unknown state indexes are silently ignored
 426                *  should be handled by the driver.
 427                */
 428                return;
 429          }
 430       }
 431       return;
 432
 433    default:
 434       _mesa_problem(ctx, "Invalid state in _mesa_fetch_state");
 435       return;
 436    }
 437 }
 438
 439
 440 /**
 441  * Return a bitmask of the Mesa state flags (_NEW_* values) which would
 442  * indicate that the given context state may have changed.
 443  * The bitmask is used during validation to determine if we need to update
 444  * vertex/fragment program parameters (like "state.material.color") when
 445  * some GL state has changed.
 446  */
 447 GLbitfield
 448 _mesa_program_state_flags(const GLint state[STATE_LENGTH])
 449 {
 450    switch (state[0]) {
 451    case STATE_MATERIAL:
 452    case STATE_LIGHT:
 453    case STATE_LIGHTMODEL_AMBIENT:
 454    case STATE_LIGHTMODEL_SCENECOLOR:
 455    case STATE_LIGHTPROD:
 456       return _NEW_LIGHT;
 457
 458    case STATE_TEXGEN:
 459    case STATE_TEXENV_COLOR:
 460       return _NEW_TEXTURE;
 461
 462    case STATE_FOG:
 463 #if 0
 464    case STATE_FOG_COLOR:
 465    case STATE_FOG_PARAMS:
 466 #endif
 467       return _NEW_FOG;
 468
 469    case STATE_CLIPPLANE:
 470       return _NEW_TRANSFORM;
 471
 472    case STATE_POINT:
 473       return _NEW_POINT;
 474
 475    case STATE_MODELVIEW_MATRIX:
 476       return _NEW_MODELVIEW;
 477    case STATE_PROJECTION_MATRIX:
 478       return _NEW_PROJECTION;
 479    case STATE_MVP_MATRIX:
 480       return _NEW_MODELVIEW | _NEW_PROJECTION;
 481    case STATE_TEXTURE_MATRIX:
 482       return _NEW_TEXTURE_MATRIX;
 483    case STATE_PROGRAM_MATRIX:
 484       return _NEW_TRACK_MATRIX;
 485
 486    case STATE_DEPTH_RANGE:
 487       return _NEW_VIEWPORT;
 488
 489    case STATE_FRAGMENT_PROGRAM:
 490    case STATE_VERTEX_PROGRAM:
 491       return _NEW_PROGRAM;
 492
 493    case STATE_NORMAL_SCALE:
 494       return _NEW_MODELVIEW;
 495
 496    case STATE_INTERNAL:
 497       switch (state[1]) {
 498       case STATE_TEXRECT_SCALE:
 499          return _NEW_TEXTURE;
 500       default:
 501          /* unknown state indexes are silently ignored and
 502          *  no flag set, since it is handled by the driver.
 503          */
 504          return 0;
 505       }
 506
 507    default:
 508       _mesa_problem(NULL, "unexpected state[0] in make_state_flags()");
 509       return 0;
 510    }
 511 }
 512
 513
 514 static void
 515 append(char *dst, const char *src)
 516 {
 517    while (*dst)
 518       dst++;
 519    while (*src)
 520      *dst++ = *src++;
 521    *dst = 0;
 522 }
 523
 524
 525 static void
 526 append_token(char *dst, gl_state_index k)
 527 {
 528    switch (k) {
 529    case STATE_MATERIAL:
 530       append(dst, "material");
 531       break;
 532    case STATE_LIGHT:
 533       append(dst, "light");
 534       break;
 535    case STATE_LIGHTMODEL_AMBIENT:
 536       append(dst, "lightmodel.ambient");
 537       break;
 538    case STATE_LIGHTMODEL_SCENECOLOR:
 539       break;
 540    case STATE_LIGHTPROD:
 541       append(dst, "lightprod");
 542       break;
 543    case STATE_TEXGEN:
 544       append(dst, "texgen");
 545       break;
 546    case STATE_FOG:
 547       append(dst, "fog");
 548       break;
 549    case STATE_FOG_COLOR:
 550       append(dst, ".color");
 551       break;
 552    case STATE_FOG_PARAMS:
 553       append(dst, ".params");
 554       break;
 555    case STATE_CLIPPLANE:
 556       append(dst, "clip");
 557       break;
 558    case STATE_POINT:
 559       append(dst, "point");
 560       break;
 561    case STATE_POINT_SIZE:
 562       append(dst, "size");
 563       break;
 564    case STATE_POINT_ATTENUATION:
 565       append(dst, "attenuation");
 566       break;
 567    case STATE_MODELVIEW_MATRIX:
 568       append(dst, "matrix.modelview");
 569       break;
 570    case STATE_PROJECTION_MATRIX:
 571       append(dst, "matrix.projection");
 572       break;
 573    case STATE_MVP_MATRIX:
 574       append(dst, "matrix.mvp");
 575       break;
 576    case STATE_TEXTURE_MATRIX:
 577       append(dst, "matrix.texture");
 578       break;
 579    case STATE_PROGRAM_MATRIX:
 580       append(dst, "matrix.program");
 581       break;
 582    case STATE_MATRIX_INVERSE:
 583       append(dst, ".inverse");
 584       break;
 585    case STATE_MATRIX_TRANSPOSE:
 586       append(dst, ".transpose");
 587       break;
 588    case STATE_MATRIX_INVTRANS:
 589       append(dst, ".invtrans");
 590       break;
 591    case STATE_AMBIENT:
 592       append(dst, ".ambient");
 593       break;
 594    case STATE_DIFFUSE:
 595       append(dst, ".diffuse");
 596       break;
 597    case STATE_SPECULAR:
 598       append(dst, ".specular");
 599       break;
 600    case STATE_EMISSION:
 601       append(dst, ".emission");
 602       break;
 603    case STATE_SHININESS:
 604       append(dst, "lshininess");
 605       break;
 606    case STATE_HALF_VECTOR:
 607       append(dst, ".half");
 608       break;
 609    case STATE_POSITION:
 610       append(dst, ".position");
 611       break;
 612    case STATE_ATTENUATION:
 613       append(dst, ".attenuation");
 614       break;
 615    case STATE_SPOT_DIRECTION:
 616       append(dst, ".spot.direction");
 617       break;
 618    case STATE_SPOT_CUTOFF:
 619       append(dst, ".spot.cutoff");
 620       break;
 621    case STATE_TEXGEN_EYE_S:
 622       append(dst, "eye.s");
 623       break;
 624    case STATE_TEXGEN_EYE_T:
 625       append(dst, "eye.t");
 626       break;
 627    case STATE_TEXGEN_EYE_R:
 628       append(dst, "eye.r");
 629       break;
 630    case STATE_TEXGEN_EYE_Q:
 631       append(dst, "eye.q");
 632       break;
 633    case STATE_TEXGEN_OBJECT_S:
 634       append(dst, "object.s");
 635       break;
 636    case STATE_TEXGEN_OBJECT_T:
 637       append(dst, "object.t");
 638       break;
 639    case STATE_TEXGEN_OBJECT_R:
 640       append(dst, "object.r");
 641       break;
 642    case STATE_TEXGEN_OBJECT_Q:
 643       append(dst, "object.q");
 644       break;
 645    case STATE_TEXENV_COLOR:
 646       append(dst, "texenv");
 647       break;
 648    case STATE_DEPTH_RANGE:
 649       append(dst, "depth.range");
 650       break;
 651    case STATE_VERTEX_PROGRAM:
 652    case STATE_FRAGMENT_PROGRAM:
 653       break;
 654    case STATE_ENV:
 655       append(dst, "env");
 656       break;
 657    case STATE_LOCAL:
 658       append(dst, "local");
 659       break;
 660    case STATE_NORMAL_SCALE:
 661       append(dst, "normalScale");
 662       break;
 663    case STATE_INTERNAL:
 664    case STATE_POSITION_NORMALIZED:
 665       append(dst, "(internal)");
 666       break;
 667    default:
 668       ;
 669    }
 670 }
 671
 672 static void
 673 append_face(char *dst, GLint face)
 674 {
 675    if (face == 0)
 676       append(dst, "front.");
 677    else
 678       append(dst, "back.");
 679 }
 680
 681 static void
 682 append_index(char *dst, GLint index)
 683 {
 684    char s[20];
 685    _mesa_sprintf(s, "[%d]", index);
 686    append(dst, s);
 687 }
 688
 689 /**
 690  * Make a string from the given state vector.
 691  * For example, return "state.matrix.texture[2].inverse".
 692  * Use _mesa_free() to deallocate the string.
 693  */
 694 const char *
 695 _mesa_program_state_string(const GLint state[STATE_LENGTH])
 696 {
 697    char str[1000] = "";
 698    char tmp[30];
 699
 700    append(str, "state.");
 701    append_token(str, (gl_state_index) state[0]);
 702
 703    switch (state[0]) {
 704    case STATE_MATERIAL:
 705       append_face(str, state[1]);
 706       append_token(str, (gl_state_index) state[2]);
 707       break;
 708    case STATE_LIGHT:
 709       append_index(str, state[1]); /* light number [i]. */
 710       append_token(str, (gl_state_index) state[2]); /* coefficients */
 711       break;
 712    case STATE_LIGHTMODEL_AMBIENT:
 713       append(str, "lightmodel.ambient");
 714       break;
 715    case STATE_LIGHTMODEL_SCENECOLOR:
 716       if (state[1] == 0) {
 717          append(str, "lightmodel.front.scenecolor");
 718       }
 719       else {
 720          append(str, "lightmodel.back.scenecolor");
 721       }
 722       break;
 723    case STATE_LIGHTPROD:
 724       append_index(str, state[1]); /* light number [i]. */
 725       append_face(str, state[2]);
 726       append_token(str, (gl_state_index) state[3]);
 727       break;
 728    case STATE_TEXGEN:
 729       append_index(str, state[1]); /* tex unit [i] */
 730       append_token(str, (gl_state_index) state[2]); /* plane coef */
 731       break;
 732    case STATE_TEXENV_COLOR:
 733       append_index(str, state[1]); /* tex unit [i] */
 734       append(str, "color");
 735       break;
 736    case STATE_FOG:
 737       append(str, "fog");
 738       append_token(str, (gl_state_index) state[1]); /* color or params */
 739       break;
 740    case STATE_CLIPPLANE:
 741       append_index(str, state[1]); /* plane [i] */
 742       append(str, ".plane");
 743       break;
 744    case STATE_POINT:
 745       append_token(str, state[1]);
 746       break;
 747    case STATE_MODELVIEW_MATRIX:
 748    case STATE_PROJECTION_MATRIX:
 749    case STATE_MVP_MATRIX:
 750    case STATE_TEXTURE_MATRIX:
 751    case STATE_PROGRAM_MATRIX:
 752       {
 753          /* state[0] = modelview, projection, texture, etc. */
 754          /* state[1] = which texture matrix or program matrix */
 755          /* state[2] = first row to fetch */
 756          /* state[3] = last row to fetch */
 757          /* state[4] = transpose, inverse or invtrans */
 758          const gl_state_index mat = (gl_state_index) state[0];
 759          const GLuint index = (GLuint) state[1];
 760          const GLuint firstRow = (GLuint) state[2];
 761          const GLuint lastRow = (GLuint) state[3];
 762          const gl_state_index modifier = (gl_state_index) state[4];
 763          if (index ||
 764              mat == STATE_TEXTURE_MATRIX ||
 765              mat == STATE_PROGRAM_MATRIX)
 766             append_index(str, index);
 767          if (modifier)
 768             append_token(str, modifier);
 769          if (firstRow == lastRow)
 770             _mesa_sprintf(tmp, ".row[%d]", firstRow);
 771          else
 772             _mesa_sprintf(tmp, ".row[%d..%d]", firstRow, lastRow);
 773          append(str, tmp);
 774       }
 775       break;
 776    case STATE_DEPTH_RANGE:
 777       break;
 778    case STATE_FRAGMENT_PROGRAM:
 779    case STATE_VERTEX_PROGRAM:
 780       /* state[1] = {STATE_ENV, STATE_LOCAL} */
 781       /* state[2] = parameter index          */
 782       append_token(str, (gl_state_index) state[1]);
 783       append_index(str, state[2]);
 784       break;
 785    case STATE_INTERNAL:
 786       break;
 787    default:
 788       _mesa_problem(NULL, "Invalid state in _mesa_program_state_string");
 789       break;
 790    }
 791
 792    return _mesa_strdup(str);
 793 }
 794
 795
 796 /**
 797  * Loop over all the parameters in a parameter list.  If the parameter
 798  * is a GL state reference, look up the current value of that state
 799  * variable and put it into the parameter's Value[4] array.
 800  * This would be called at glBegin time when using a fragment program.
 801  */
 802 void
 803 _mesa_load_state_parameters(GLcontext *ctx,
 804                             struct gl_program_parameter_list *paramList)
 805 {
 806    GLuint i;
 807
 808    if (!paramList)
 809       return;
 810
 811    for (i = 0; i < paramList->NumParameters; i++) {
 812       if (paramList->Parameters[i].Type == PROGRAM_STATE_VAR) {
 813          _mesa_fetch_state(ctx,
 814                            (gl_state_index *) paramList->Parameters[i].StateIndexes,
 815                            paramList->ParameterValues[i]);
 816       }
 817    }
 818 }
 819