src/mesa/shader/prog_statevars.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.1
   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
  41
  42 /**
  43  * Use the list of tokens in the state[] array to find global GL state
  44  * and return it in <value>.  Usually, four values are returned in <value>
  45  * but matrix queries may return as many as 16 values.
  46  * This function is used for ARB vertex/fragment programs.
  47  * The program parser will produce the state[] values.
  48  */
  49 static void
  50 _mesa_fetch_state(GLcontext *ctx, const gl_state_index state[],
  51                   GLfloat *value)
  52 {
  53    switch (state[0]) {
  54    case STATE_MATERIAL:
  55       {
  56          /* state[1] is either 0=front or 1=back side */
  57          const GLuint face = (GLuint) state[1];
  58          const struct gl_material *mat = &ctx->Light.Material;
  59          ASSERT(face == 0 || face == 1);
  60          /* we rely on tokens numbered so that _BACK_ == _FRONT_+ 1 */
  61          ASSERT(MAT_ATTRIB_FRONT_AMBIENT + 1 == MAT_ATTRIB_BACK_AMBIENT);
  62          /* XXX we could get rid of this switch entirely with a little
  63           * work in arbprogparse.c's parse_state_single_item().
  64           */
  65          /* state[2] is the material attribute */
  66          switch (state[2]) {
  67          case STATE_AMBIENT:
  68             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_AMBIENT + face]);
  69             return;
  70          case STATE_DIFFUSE:
  71             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_DIFFUSE + face]);
  72             return;
  73          case STATE_SPECULAR:
  74             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_SPECULAR + face]);
  75             return;
  76          case STATE_EMISSION:
  77             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_EMISSION + face]);
  78             return;
  79          case STATE_SHININESS:
  80             value[0] = mat->Attrib[MAT_ATTRIB_FRONT_SHININESS + face][0];
  81             value[1] = 0.0F;
  82             value[2] = 0.0F;
  83             value[3] = 1.0F;
  84             return;
  85          default:
  86             _mesa_problem(ctx, "Invalid material state in fetch_state");
  87             return;
  88          }
  89       }
  90    case STATE_LIGHT:
  91       {
  92          /* state[1] is the light number */
  93          const GLuint ln = (GLuint) state[1];
  94          /* state[2] is the light attribute */
  95          switch (state[2]) {
  96          case STATE_AMBIENT:
  97             COPY_4V(value, ctx->Light.Light[ln].Ambient);
  98             return;
  99          case STATE_DIFFUSE:
 100             COPY_4V(value, ctx->Light.Light[ln].Diffuse);
 101             return;
 102          case STATE_SPECULAR:
 103             COPY_4V(value, ctx->Light.Light[ln].Specular);
 104             return;
 105          case STATE_POSITION:
 106             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 107             return;
 108          case STATE_ATTENUATION:
 109             value[0] = ctx->Light.Light[ln].ConstantAttenuation;
 110             value[1] = ctx->Light.Light[ln].LinearAttenuation;
 111             value[2] = ctx->Light.Light[ln].QuadraticAttenuation;
 112             value[3] = ctx->Light.Light[ln].SpotExponent;
 113             return;
 114          case STATE_SPOT_DIRECTION:
 115             COPY_3V(value, ctx->Light.Light[ln].EyeDirection);
 116             value[3] = ctx->Light.Light[ln]._CosCutoff;
 117             return;
 118          case STATE_SPOT_CUTOFF:
 119             value[0] = ctx->Light.Light[ln].SpotCutoff;
 120             return;
 121          case STATE_HALF_VECTOR:
 122             {
 123                static const GLfloat eye_z[] = {0, 0, 1};
 124                GLfloat p[3];
 125                /* Compute infinite half angle vector:
 126                 *   halfVector = normalize(normalize(lightPos) + (0, 0, 1))
 127                 * light.EyePosition.w should be 0 for infinite lights.
 128                 */
 129                COPY_3V(p, ctx->Light.Light[ln].EyePosition);
 130                NORMALIZE_3FV(p);
 131                ADD_3V(value, p, eye_z);
 132                NORMALIZE_3FV(value);
 133                value[3] = 1.0;
 134             }
 135             return;
 136          default:
 137             _mesa_problem(ctx, "Invalid light state in fetch_state");
 138             return;
 139          }
 140       }
 141    case STATE_LIGHTMODEL_AMBIENT:
 142       COPY_4V(value, ctx->Light.Model.Ambient);
 143       return;
 144    case STATE_LIGHTMODEL_SCENECOLOR:
 145       if (state[1] == 0) {
 146          /* front */
 147          GLint i;
 148          for (i = 0; i < 3; i++) {
 149             value[i] = ctx->Light.Model.Ambient[i]
 150                * ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT][i]
 151                + ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION][i];
 152          }
 153          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
 154       }
 155       else {
 156          /* back */
 157          GLint i;
 158          for (i = 0; i < 3; i++) {
 159             value[i] = ctx->Light.Model.Ambient[i]
 160                * ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT][i]
 161                + ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION][i];
 162          }
 163          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
 164       }
 165       return;
 166    case STATE_LIGHTPROD:
 167       {
 168          const GLuint ln = (GLuint) state[1];
 169          const GLuint face = (GLuint) state[2];
 170          GLint i;
 171          ASSERT(face == 0 || face == 1);
 172          switch (state[3]) {
 173             case STATE_AMBIENT:
 174                for (i = 0; i < 3; i++) {
 175                   value[i] = ctx->Light.Light[ln].Ambient[i] *
 176                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][i];
 177                }
 178                /* [3] = material alpha */
 179                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][3];
 180                return;
 181             case STATE_DIFFUSE:
 182                for (i = 0; i < 3; i++) {
 183                   value[i] = ctx->Light.Light[ln].Diffuse[i] *
 184                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][i];
 185                }
 186                /* [3] = material alpha */
 187                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 188                return;
 189             case STATE_SPECULAR:
 190                for (i = 0; i < 3; i++) {
 191                   value[i] = ctx->Light.Light[ln].Specular[i] *
 192                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][i];
 193                }
 194                /* [3] = material alpha */
 195                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][3];
 196                return;
 197             default:
 198                _mesa_problem(ctx, "Invalid lightprod state in fetch_state");
 199                return;
 200          }
 201       }
 202    case STATE_TEXGEN:
 203       {
 204          /* state[1] is the texture unit */
 205          const GLuint unit = (GLuint) state[1];
 206          /* state[2] is the texgen attribute */
 207          switch (state[2]) {
 208          case STATE_TEXGEN_EYE_S:
 209             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneS);
 210             return;
 211          case STATE_TEXGEN_EYE_T:
 212             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneT);
 213             return;
 214          case STATE_TEXGEN_EYE_R:
 215             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneR);
 216             return;
 217          case STATE_TEXGEN_EYE_Q:
 218             COPY_4V(value, ctx->Texture.Unit[unit].EyePlaneQ);
 219             return;
 220          case STATE_TEXGEN_OBJECT_S:
 221             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneS);
 222             return;
 223          case STATE_TEXGEN_OBJECT_T:
 224             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneT);
 225             return;
 226          case STATE_TEXGEN_OBJECT_R:
 227             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneR);
 228             return;
 229          case STATE_TEXGEN_OBJECT_Q:
 230             COPY_4V(value, ctx->Texture.Unit[unit].ObjectPlaneQ);
 231             return;
 232          default:
 233             _mesa_problem(ctx, "Invalid texgen state in fetch_state");
 234             return;
 235          }
 236       }
 237    case STATE_TEXENV_COLOR:
 238       {
 239          /* state[1] is the texture unit */
 240          const GLuint unit = (GLuint) state[1];
 241          COPY_4V(value, ctx->Texture.Unit[unit].EnvColor);
 242       }
 243       return;
 244    case STATE_FOG_COLOR:
 245       COPY_4V(value, ctx->Fog.Color);
 246       return;
 247    case STATE_FOG_PARAMS:
 248       value[0] = ctx->Fog.Density;
 249       value[1] = ctx->Fog.Start;
 250       value[2] = ctx->Fog.End;
 251       value[3] = (ctx->Fog.End == ctx->Fog.Start)
 252          ? 1.0f : (GLfloat)(1.0 / (ctx->Fog.End - ctx->Fog.Start));
 253       return;
 254    case STATE_CLIPPLANE:
 255       {
 256          const GLuint plane = (GLuint) state[1];
 257          COPY_4V(value, ctx->Transform.EyeUserPlane[plane]);
 258       }
 259       return;
 260    case STATE_POINT_SIZE:
 261       value[0] = ctx->Point.Size;
 262       value[1] = ctx->Point.MinSize;
 263       value[2] = ctx->Point.MaxSize;
 264       value[3] = ctx->Point.Threshold;
 265       return;
 266    case STATE_POINT_ATTENUATION:
 267       value[0] = ctx->Point.Params[0];
 268       value[1] = ctx->Point.Params[1];
 269       value[2] = ctx->Point.Params[2];
 270       value[3] = 1.0F;
 271       return;
 272    case STATE_MODELVIEW_MATRIX:
 273    case STATE_PROJECTION_MATRIX:
 274    case STATE_MVP_MATRIX:
 275    case STATE_TEXTURE_MATRIX:
 276    case STATE_PROGRAM_MATRIX:
 277    case STATE_COLOR_MATRIX:
 278       {
 279          /* state[0] = modelview, projection, texture, etc. */
 280          /* state[1] = which texture matrix or program matrix */
 281          /* state[2] = first row to fetch */
 282          /* state[3] = last row to fetch */
 283          /* state[4] = transpose, inverse or invtrans */
 284          const GLmatrix *matrix;
 285          const gl_state_index mat = state[0];
 286          const GLuint index = (GLuint) state[1];
 287          const GLuint firstRow = (GLuint) state[2];
 288          const GLuint lastRow = (GLuint) state[3];
 289          const gl_state_index modifier = state[4];
 290          const GLfloat *m;
 291          GLuint row, i;
 292          ASSERT(firstRow >= 0);
 293          ASSERT(firstRow < 4);
 294          ASSERT(lastRow >= 0);
 295          ASSERT(lastRow < 4);
 296          if (mat == STATE_MODELVIEW_MATRIX) {
 297             matrix = ctx->ModelviewMatrixStack.Top;
 298          }
 299          else if (mat == STATE_PROJECTION_MATRIX) {
 300             matrix = ctx->ProjectionMatrixStack.Top;
 301          }
 302          else if (mat == STATE_MVP_MATRIX) {
 303             matrix = &ctx->_ModelProjectMatrix;
 304          }
 305          else if (mat == STATE_TEXTURE_MATRIX) {
 306             matrix = ctx->TextureMatrixStack[index].Top;
 307          }
 308          else if (mat == STATE_PROGRAM_MATRIX) {
 309             matrix = ctx->ProgramMatrixStack[index].Top;
 310          }
 311          else if (mat == STATE_COLOR_MATRIX) {
 312             matrix = ctx->ColorMatrixStack.Top;
 313          }
 314          else {
 315             _mesa_problem(ctx, "Bad matrix name in _mesa_fetch_state()");
 316             return;
 317          }
 318          if (modifier == STATE_MATRIX_INVERSE ||
 319              modifier == STATE_MATRIX_INVTRANS) {
 320             /* Be sure inverse is up to date:
 321              */
 322             _math_matrix_alloc_inv( (GLmatrix *) matrix );
 323             _math_matrix_analyse( (GLmatrix*) matrix );
 324             m = matrix->inv;
 325          }
 326          else {
 327             m = matrix->m;
 328          }
 329          if (modifier == STATE_MATRIX_TRANSPOSE ||
 330              modifier == STATE_MATRIX_INVTRANS) {
 331             for (i = 0, row = firstRow; row <= lastRow; row++) {
 332                value[i++] = m[row * 4 + 0];
 333                value[i++] = m[row * 4 + 1];
 334                value[i++] = m[row * 4 + 2];
 335                value[i++] = m[row * 4 + 3];
 336             }
 337          }
 338          else {
 339             for (i = 0, row = firstRow; row <= lastRow; row++) {
 340                value[i++] = m[row + 0];
 341                value[i++] = m[row + 4];
 342                value[i++] = m[row + 8];
 343                value[i++] = m[row + 12];
 344             }
 345          }
 346       }
 347       return;
 348    case STATE_DEPTH_RANGE:
 349       value[0] = ctx->Viewport.Near;                     /* near       */
 350       value[1] = ctx->Viewport.Far;                      /* far        */
 351       value[2] = ctx->Viewport.Far - ctx->Viewport.Near; /* far - near */
 352       value[3] = 1.0;
 353       return;
 354    case STATE_FRAGMENT_PROGRAM:
 355       {
 356          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 357          /* state[2] = parameter index          */
 358          const int idx = (int) state[2];
 359          switch (state[1]) {
 360             case STATE_ENV:
 361                COPY_4V(value, ctx->FragmentProgram.Parameters[idx]);
 362                break;
 363             case STATE_LOCAL:
 364                COPY_4V(value, ctx->FragmentProgram.Current->Base.LocalParams[idx]);
 365                break;
 366             default:
 367                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 368                return;
 369          }
 370       }
 371       return;
 372
 373    case STATE_VERTEX_PROGRAM:
 374       {
 375          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 376          /* state[2] = parameter index          */
 377          const int idx = (int) state[2];
 378          switch (state[1]) {
 379             case STATE_ENV:
 380                COPY_4V(value, ctx->VertexProgram.Parameters[idx]);
 381                break;
 382             case STATE_LOCAL:
 383                COPY_4V(value, ctx->VertexProgram.Current->Base.LocalParams[idx]);
 384                break;
 385             default:
 386                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 387                return;
 388          }
 389       }
 390       return;
 391
 392    case STATE_NORMAL_SCALE:
 393       ASSIGN_4V(value, ctx->_ModelViewInvScale, 0, 0, 1);
 394       return;
 395
 396    case STATE_INTERNAL:
 397       switch (state[1]) {
 398       case STATE_NORMAL_SCALE:
 399          ASSIGN_4V(value,
 400                    ctx->_ModelViewInvScale,
 401                    ctx->_ModelViewInvScale,
 402                    ctx->_ModelViewInvScale,
 403                    1);
 404          return;
 405       case STATE_TEXRECT_SCALE:
 406          {
 407             const int unit = (int) state[2];
 408             const struct gl_texture_object *texObj
 409                = ctx->Texture.Unit[unit]._Current;
 410             if (texObj) {
 411                struct gl_texture_image *texImage = texObj->Image[0][0];
 412                ASSIGN_4V(value, (GLfloat) (1.0 / texImage->Width),
 413                          (GLfloat)(1.0 / texImage->Height),
 414                          0.0f, 1.0f);
 415             }
 416          }
 417          return;
 418       case STATE_FOG_PARAMS_OPTIMIZED:
 419          /* for simpler per-vertex/pixel fog calcs. POW (for EXP/EXP2 fog)
 420           * might be more expensive than EX2 on some hw, plus it needs
 421           * another constant (e) anyway. Linear fog can now be done with a
 422           * single MAD.
 423           * linear: fogcoord * -1/(end-start) + end/(end-start)
 424           * exp: 2^-(density/ln(2) * fogcoord)
 425           * exp2: 2^-((density/(ln(2)^2) * fogcoord)^2)
 426           */
 427          value[0] = (ctx->Fog.End == ctx->Fog.Start)
 428             ? 1.0f : (GLfloat)(-1.0F / (ctx->Fog.End - ctx->Fog.Start));
 429          value[1] = ctx->Fog.End * -value[0];
 430          value[2] = (GLfloat)(ctx->Fog.Density * ONE_DIV_LN2);
 431          value[3] = (GLfloat)(ctx->Fog.Density * ONE_DIV_SQRT_LN2);
 432          return;
 433
 434       case STATE_LIGHT_SPOT_DIR_NORMALIZED: {
 435          /* here, state[2] is the light number */
 436          /* pre-normalize spot dir */
 437          const GLuint ln = (GLuint) state[2];
 438          COPY_3V(value, ctx->Light.Light[ln]._NormDirection);
 439          value[3] = ctx->Light.Light[ln]._CosCutoff;
 440          return;
 441       }
 442
 443       case STATE_LIGHT_POSITION: {
 444          const GLuint ln = (GLuint) state[2];
 445          COPY_4V(value, ctx->Light.Light[ln]._Position);
 446          return;
 447       }
 448
 449       case STATE_LIGHT_POSITION_NORMALIZED: {
 450          const GLuint ln = (GLuint) state[2];
 451          COPY_4V(value, ctx->Light.Light[ln]._Position);
 452          NORMALIZE_3FV( value );
 453          return;
 454       }
 455
 456       case STATE_LIGHT_HALF_VECTOR: {
 457          const GLuint ln = (GLuint) state[2];
 458          GLfloat p[3];
 459          /* Compute infinite half angle vector:
 460           *   halfVector = normalize(normalize(lightPos) + (0, 0, 1))
 461           * light.EyePosition.w should be 0 for infinite lights.
 462           */
 463          COPY_3V(p, ctx->Light.Light[ln]._Position);
 464          NORMALIZE_3FV(p);
 465          ADD_3V(value, p, ctx->_EyeZDir);
 466          NORMALIZE_3FV(value);
 467          value[3] = 1.0;
 468          return;
 469       }
 470
 471
 472
 473       case STATE_PT_SCALE:
 474          value[0] = ctx->Pixel.RedScale;
 475          value[1] = ctx->Pixel.GreenScale;
 476          value[2] = ctx->Pixel.BlueScale;
 477          value[3] = ctx->Pixel.AlphaScale;
 478          break;
 479       case STATE_PT_BIAS:
 480          value[0] = ctx->Pixel.RedBias;
 481          value[1] = ctx->Pixel.GreenBias;
 482          value[2] = ctx->Pixel.BlueBias;
 483          value[3] = ctx->Pixel.AlphaBias;
 484          break;
 485       case STATE_PCM_SCALE:
 486          COPY_4V(value, ctx->Pixel.PostColorMatrixScale);
 487          break;
 488       case STATE_PCM_BIAS:
 489          COPY_4V(value, ctx->Pixel.PostColorMatrixBias);
 490          break;
 491       default:
 492          /* unknown state indexes are silently ignored
 493           *  should be handled by the driver.
 494           */
 495          return;
 496       }
 497       return;
 498
 499    default:
 500       _mesa_problem(ctx, "Invalid state in _mesa_fetch_state");
 501       return;
 502    }
 503 }
 504
 505
 506 /**
 507  * Return a bitmask of the Mesa state flags (_NEW_* values) which would
 508  * indicate that the given context state may have changed.
 509  * The bitmask is used during validation to determine if we need to update
 510  * vertex/fragment program parameters (like "state.material.color") when
 511  * some GL state has changed.
 512  */
 513 GLbitfield
 514 _mesa_program_state_flags(const gl_state_index state[STATE_LENGTH])
 515 {
 516    switch (state[0]) {
 517    case STATE_MATERIAL:
 518    case STATE_LIGHT:
 519    case STATE_LIGHTMODEL_AMBIENT:
 520    case STATE_LIGHTMODEL_SCENECOLOR:
 521    case STATE_LIGHTPROD:
 522       return _NEW_LIGHT;
 523
 524    case STATE_TEXGEN:
 525    case STATE_TEXENV_COLOR:
 526       return _NEW_TEXTURE;
 527
 528    case STATE_FOG_COLOR:
 529    case STATE_FOG_PARAMS:
 530       return _NEW_FOG;
 531
 532    case STATE_CLIPPLANE:
 533       return _NEW_TRANSFORM;
 534
 535    case STATE_POINT_SIZE:
 536    case STATE_POINT_ATTENUATION:
 537       return _NEW_POINT;
 538
 539    case STATE_MODELVIEW_MATRIX:
 540       return _NEW_MODELVIEW;
 541    case STATE_PROJECTION_MATRIX:
 542       return _NEW_PROJECTION;
 543    case STATE_MVP_MATRIX:
 544       return _NEW_MODELVIEW | _NEW_PROJECTION;
 545    case STATE_TEXTURE_MATRIX:
 546       return _NEW_TEXTURE_MATRIX;
 547    case STATE_PROGRAM_MATRIX:
 548       return _NEW_TRACK_MATRIX;
 549    case STATE_COLOR_MATRIX:
 550       return _NEW_COLOR_MATRIX;
 551
 552    case STATE_DEPTH_RANGE:
 553       return _NEW_VIEWPORT;
 554
 555    case STATE_FRAGMENT_PROGRAM:
 556    case STATE_VERTEX_PROGRAM:
 557       return _NEW_PROGRAM;
 558
 559    case STATE_NORMAL_SCALE:
 560       return _NEW_MODELVIEW;
 561
 562    case STATE_INTERNAL:
 563       switch (state[1]) {
 564       case STATE_TEXRECT_SCALE:
 565          return _NEW_TEXTURE;
 566       case STATE_FOG_PARAMS_OPTIMIZED:
 567          return _NEW_FOG;
 568       default:
 569          /* unknown state indexes are silently ignored and
 570          *  no flag set, since it is handled by the driver.
 571          */
 572          return 0;
 573       }
 574
 575    default:
 576       _mesa_problem(NULL, "unexpected state[0] in make_state_flags()");
 577       return 0;
 578    }
 579 }
 580
 581
 582 static void
 583 append(char *dst, const char *src)
 584 {
 585    while (*dst)
 586       dst++;
 587    while (*src)
 588      *dst++ = *src++;
 589    *dst = 0;
 590 }
 591
 592
 593 static void
 594 append_token(char *dst, gl_state_index k)
 595 {
 596    switch (k) {
 597    case STATE_MATERIAL:
 598       append(dst, "material");
 599       break;
 600    case STATE_LIGHT:
 601       append(dst, "light");
 602       break;
 603    case STATE_LIGHTMODEL_AMBIENT:
 604       append(dst, "lightmodel.ambient");
 605       break;
 606    case STATE_LIGHTMODEL_SCENECOLOR:
 607       break;
 608    case STATE_LIGHTPROD:
 609       append(dst, "lightprod");
 610       break;
 611    case STATE_TEXGEN:
 612       append(dst, "texgen");
 613       break;
 614    case STATE_FOG_COLOR:
 615       append(dst, "fog.color");
 616       break;
 617    case STATE_FOG_PARAMS:
 618       append(dst, "fog.params");
 619       break;
 620    case STATE_CLIPPLANE:
 621       append(dst, "clip");
 622       break;
 623    case STATE_POINT_SIZE:
 624       append(dst, "point.size");
 625       break;
 626    case STATE_POINT_ATTENUATION:
 627       append(dst, "point.attenuation");
 628       break;
 629    case STATE_MODELVIEW_MATRIX:
 630       append(dst, "matrix.modelview");
 631       break;
 632    case STATE_PROJECTION_MATRIX:
 633       append(dst, "matrix.projection");
 634       break;
 635    case STATE_MVP_MATRIX:
 636       append(dst, "matrix.mvp");
 637       break;
 638    case STATE_TEXTURE_MATRIX:
 639       append(dst, "matrix.texture");
 640       break;
 641    case STATE_PROGRAM_MATRIX:
 642       append(dst, "matrix.program");
 643       break;
 644    case STATE_COLOR_MATRIX:
 645       append(dst, "matrix.color");
 646       break;
 647    case STATE_MATRIX_INVERSE:
 648       append(dst, ".inverse");
 649       break;
 650    case STATE_MATRIX_TRANSPOSE:
 651       append(dst, ".transpose");
 652       break;
 653    case STATE_MATRIX_INVTRANS:
 654       append(dst, ".invtrans");
 655       break;
 656    case STATE_AMBIENT:
 657       append(dst, ".ambient");
 658       break;
 659    case STATE_DIFFUSE:
 660       append(dst, ".diffuse");
 661       break;
 662    case STATE_SPECULAR:
 663       append(dst, ".specular");
 664       break;
 665    case STATE_EMISSION:
 666       append(dst, ".emission");
 667       break;
 668    case STATE_SHININESS:
 669       append(dst, "lshininess");
 670       break;
 671    case STATE_HALF_VECTOR:
 672       append(dst, ".half");
 673       break;
 674    case STATE_POSITION:
 675       append(dst, ".position");
 676       break;
 677    case STATE_ATTENUATION:
 678       append(dst, ".attenuation");
 679       break;
 680    case STATE_SPOT_DIRECTION:
 681       append(dst, ".spot.direction");
 682       break;
 683    case STATE_SPOT_CUTOFF:
 684       append(dst, ".spot.cutoff");
 685       break;
 686    case STATE_TEXGEN_EYE_S:
 687       append(dst, "eye.s");
 688       break;
 689    case STATE_TEXGEN_EYE_T:
 690       append(dst, "eye.t");
 691       break;
 692    case STATE_TEXGEN_EYE_R:
 693       append(dst, "eye.r");
 694       break;
 695    case STATE_TEXGEN_EYE_Q:
 696       append(dst, "eye.q");
 697       break;
 698    case STATE_TEXGEN_OBJECT_S:
 699       append(dst, "object.s");
 700       break;
 701    case STATE_TEXGEN_OBJECT_T:
 702       append(dst, "object.t");
 703       break;
 704    case STATE_TEXGEN_OBJECT_R:
 705       append(dst, "object.r");
 706       break;
 707    case STATE_TEXGEN_OBJECT_Q:
 708       append(dst, "object.q");
 709       break;
 710    case STATE_TEXENV_COLOR:
 711       append(dst, "texenv");
 712       break;
 713    case STATE_DEPTH_RANGE:
 714       append(dst, "depth.range");
 715       break;
 716    case STATE_VERTEX_PROGRAM:
 717    case STATE_FRAGMENT_PROGRAM:
 718       break;
 719    case STATE_ENV:
 720       append(dst, "env");
 721       break;
 722    case STATE_LOCAL:
 723       append(dst, "local");
 724       break;
 725    case STATE_NORMAL_SCALE:
 726       append(dst, "normalScale");
 727       break;
 728    case STATE_INTERNAL:
 729       append(dst, "(internal)");
 730       break;
 731    case STATE_PT_SCALE:
 732       append(dst, "PTscale");
 733       break;
 734    case STATE_PT_BIAS:
 735       append(dst, "PTbias");
 736       break;
 737    case STATE_PCM_SCALE:
 738       append(dst, "PCMscale");
 739       break;
 740    case STATE_PCM_BIAS:
 741       append(dst, "PCMbias");
 742       break;
 743    default:
 744       ;
 745    }
 746 }
 747
 748 static void
 749 append_face(char *dst, GLint face)
 750 {
 751    if (face == 0)
 752       append(dst, "front.");
 753    else
 754       append(dst, "back.");
 755 }
 756
 757 static void
 758 append_index(char *dst, GLint index)
 759 {
 760    char s[20];
 761    _mesa_sprintf(s, "[%d]", index);
 762    append(dst, s);
 763 }
 764
 765 /**
 766  * Make a string from the given state vector.
 767  * For example, return "state.matrix.texture[2].inverse".
 768  * Use _mesa_free() to deallocate the string.
 769  */
 770 const char *
 771 _mesa_program_state_string(const gl_state_index state[STATE_LENGTH])
 772 {
 773    char str[1000] = "";
 774    char tmp[30];
 775
 776    append(str, "state.");
 777    append_token(str, (gl_state_index) state[0]);
 778
 779    switch (state[0]) {
 780    case STATE_MATERIAL:
 781       append_face(str, state[1]);
 782       append_token(str, (gl_state_index) state[2]);
 783       break;
 784    case STATE_LIGHT:
 785       append_index(str, state[1]); /* light number [i]. */
 786       append_token(str, (gl_state_index) state[2]); /* coefficients */
 787       break;
 788    case STATE_LIGHTMODEL_AMBIENT:
 789       append(str, "lightmodel.ambient");
 790       break;
 791    case STATE_LIGHTMODEL_SCENECOLOR:
 792       if (state[1] == 0) {
 793          append(str, "lightmodel.front.scenecolor");
 794       }
 795       else {
 796          append(str, "lightmodel.back.scenecolor");
 797       }
 798       break;
 799    case STATE_LIGHTPROD:
 800       append_index(str, state[1]); /* light number [i]. */
 801       append_face(str, state[2]);
 802       append_token(str, (gl_state_index) state[3]);
 803       break;
 804    case STATE_TEXGEN:
 805       append_index(str, state[1]); /* tex unit [i] */
 806       append_token(str, (gl_state_index) state[2]); /* plane coef */
 807       break;
 808    case STATE_TEXENV_COLOR:
 809       append_index(str, state[1]); /* tex unit [i] */
 810       append(str, "color");
 811       break;
 812    case STATE_CLIPPLANE:
 813       append_index(str, state[1]); /* plane [i] */
 814       append(str, ".plane");
 815       break;
 816    case STATE_MODELVIEW_MATRIX:
 817    case STATE_PROJECTION_MATRIX:
 818    case STATE_MVP_MATRIX:
 819    case STATE_TEXTURE_MATRIX:
 820    case STATE_PROGRAM_MATRIX:
 821    case STATE_COLOR_MATRIX:
 822       {
 823          /* state[0] = modelview, projection, texture, etc. */
 824          /* state[1] = which texture matrix or program matrix */
 825          /* state[2] = first row to fetch */
 826          /* state[3] = last row to fetch */
 827          /* state[4] = transpose, inverse or invtrans */
 828          const gl_state_index mat = (gl_state_index) state[0];
 829          const GLuint index = (GLuint) state[1];
 830          const GLuint firstRow = (GLuint) state[2];
 831          const GLuint lastRow = (GLuint) state[3];
 832          const gl_state_index modifier = (gl_state_index) state[4];
 833          if (index ||
 834              mat == STATE_TEXTURE_MATRIX ||
 835              mat == STATE_PROGRAM_MATRIX)
 836             append_index(str, index);
 837          if (modifier)
 838             append_token(str, modifier);
 839          if (firstRow == lastRow)
 840             _mesa_sprintf(tmp, ".row[%d]", firstRow);
 841          else
 842             _mesa_sprintf(tmp, ".row[%d..%d]", firstRow, lastRow);
 843          append(str, tmp);
 844       }
 845       break;
 846    case STATE_POINT_SIZE:
 847       break;
 848    case STATE_POINT_ATTENUATION:
 849       break;
 850    case STATE_FOG_PARAMS:
 851       break;
 852    case STATE_FOG_COLOR:
 853       break;
 854    case STATE_DEPTH_RANGE:
 855       break;
 856    case STATE_FRAGMENT_PROGRAM:
 857    case STATE_VERTEX_PROGRAM:
 858       /* state[1] = {STATE_ENV, STATE_LOCAL} */
 859       /* state[2] = parameter index          */
 860       append_token(str, (gl_state_index) state[1]);
 861       append_index(str, state[2]);
 862       break;
 863    case STATE_INTERNAL:
 864       break;
 865    default:
 866       _mesa_problem(NULL, "Invalid state in _mesa_program_state_string");
 867       break;
 868    }
 869
 870    return _mesa_strdup(str);
 871 }
 872
 873
 874 /**
 875  * Loop over all the parameters in a parameter list.  If the parameter
 876  * is a GL state reference, look up the current value of that state
 877  * variable and put it into the parameter's Value[4] array.
 878  * This would be called at glBegin time when using a fragment program.
 879  */
 880 void
 881 _mesa_load_state_parameters(GLcontext *ctx,
 882                             struct gl_program_parameter_list *paramList)
 883 {
 884    GLuint i;
 885
 886    if (!paramList)
 887       return;
 888
 889    /*assert(ctx->Driver.NeedFlush == 0);*/
 890
 891    for (i = 0; i < paramList->NumParameters; i++) {
 892       if (paramList->Parameters[i].Type == PROGRAM_STATE_VAR) {
 893          _mesa_fetch_state(ctx,
 894                            (gl_state_index *) paramList->Parameters[i].StateIndexes,
 895                            paramList->ParameterValues[i]);
 896       }
 897    }
 898 }
 899