src/mesa/program/prog_statevars.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * 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 "main/glheader.h"
  33 #include "main/context.h"
  34 #include "main/blend.h"
  35 #include "main/imports.h"
  36 #include "main/macros.h"
  37 #include "main/mtypes.h"
  38 #include "main/fbobject.h"
  39 #include "prog_statevars.h"
  40 #include "prog_parameter.h"
  41 #include "main/samplerobj.h"
  42
  43
  44 /**
  45  * Use the list of tokens in the state[] array to find global GL state
  46  * and return it in <value>.  Usually, four values are returned in <value>
  47  * but matrix queries may return as many as 16 values.
  48  * This function is used for ARB vertex/fragment programs.
  49  * The program parser will produce the state[] values.
  50  */
  51 static void
  52 _mesa_fetch_state(struct gl_context *ctx, const gl_state_index state[],
  53                   GLfloat *value)
  54 {
  55    switch (state[0]) {
  56    case STATE_MATERIAL:
  57       {
  58          /* state[1] is either 0=front or 1=back side */
  59          const GLuint face = (GLuint) state[1];
  60          const struct gl_material *mat = &ctx->Light.Material;
  61          ASSERT(face == 0 || face == 1);
  62          /* we rely on tokens numbered so that _BACK_ == _FRONT_+ 1 */
  63          ASSERT(MAT_ATTRIB_FRONT_AMBIENT + 1 == MAT_ATTRIB_BACK_AMBIENT);
  64          /* XXX we could get rid of this switch entirely with a little
  65           * work in arbprogparse.c's parse_state_single_item().
  66           */
  67          /* state[2] is the material attribute */
  68          switch (state[2]) {
  69          case STATE_AMBIENT:
  70             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_AMBIENT + face]);
  71             return;
  72          case STATE_DIFFUSE:
  73             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_DIFFUSE + face]);
  74             return;
  75          case STATE_SPECULAR:
  76             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_SPECULAR + face]);
  77             return;
  78          case STATE_EMISSION:
  79             COPY_4V(value, mat->Attrib[MAT_ATTRIB_FRONT_EMISSION + face]);
  80             return;
  81          case STATE_SHININESS:
  82             value[0] = mat->Attrib[MAT_ATTRIB_FRONT_SHININESS + face][0];
  83             value[1] = 0.0F;
  84             value[2] = 0.0F;
  85             value[3] = 1.0F;
  86             return;
  87          default:
  88             _mesa_problem(ctx, "Invalid material state in fetch_state");
  89             return;
  90          }
  91       }
  92    case STATE_LIGHT:
  93       {
  94          /* state[1] is the light number */
  95          const GLuint ln = (GLuint) state[1];
  96          /* state[2] is the light attribute */
  97          switch (state[2]) {
  98          case STATE_AMBIENT:
  99             COPY_4V(value, ctx->Light.Light[ln].Ambient);
 100             return;
 101          case STATE_DIFFUSE:
 102             COPY_4V(value, ctx->Light.Light[ln].Diffuse);
 103             return;
 104          case STATE_SPECULAR:
 105             COPY_4V(value, ctx->Light.Light[ln].Specular);
 106             return;
 107          case STATE_POSITION:
 108             COPY_4V(value, ctx->Light.Light[ln].EyePosition);
 109             return;
 110          case STATE_ATTENUATION:
 111             value[0] = ctx->Light.Light[ln].ConstantAttenuation;
 112             value[1] = ctx->Light.Light[ln].LinearAttenuation;
 113             value[2] = ctx->Light.Light[ln].QuadraticAttenuation;
 114             value[3] = ctx->Light.Light[ln].SpotExponent;
 115             return;
 116          case STATE_SPOT_DIRECTION:
 117             COPY_3V(value, ctx->Light.Light[ln].SpotDirection);
 118             value[3] = ctx->Light.Light[ln]._CosCutoff;
 119             return;
 120          case STATE_SPOT_CUTOFF:
 121             value[0] = ctx->Light.Light[ln].SpotCutoff;
 122             return;
 123          case STATE_HALF_VECTOR:
 124             {
 125                static const GLfloat eye_z[] = {0, 0, 1};
 126                GLfloat p[3];
 127                /* Compute infinite half angle vector:
 128                 *   halfVector = normalize(normalize(lightPos) + (0, 0, 1))
 129                 * light.EyePosition.w should be 0 for infinite lights.
 130                 */
 131                COPY_3V(p, ctx->Light.Light[ln].EyePosition);
 132                NORMALIZE_3FV(p);
 133                ADD_3V(value, p, eye_z);
 134                NORMALIZE_3FV(value);
 135                value[3] = 1.0;
 136             }
 137             return;
 138          default:
 139             _mesa_problem(ctx, "Invalid light state in fetch_state");
 140             return;
 141          }
 142       }
 143    case STATE_LIGHTMODEL_AMBIENT:
 144       COPY_4V(value, ctx->Light.Model.Ambient);
 145       return;
 146    case STATE_LIGHTMODEL_SCENECOLOR:
 147       if (state[1] == 0) {
 148          /* front */
 149          GLint i;
 150          for (i = 0; i < 3; i++) {
 151             value[i] = ctx->Light.Model.Ambient[i]
 152                * ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT][i]
 153                + ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_EMISSION][i];
 154          }
 155          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE][3];
 156       }
 157       else {
 158          /* back */
 159          GLint i;
 160          for (i = 0; i < 3; i++) {
 161             value[i] = ctx->Light.Model.Ambient[i]
 162                * ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_AMBIENT][i]
 163                + ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_EMISSION][i];
 164          }
 165          value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_BACK_DIFFUSE][3];
 166       }
 167       return;
 168    case STATE_LIGHTPROD:
 169       {
 170          const GLuint ln = (GLuint) state[1];
 171          const GLuint face = (GLuint) state[2];
 172          GLint i;
 173          ASSERT(face == 0 || face == 1);
 174          switch (state[3]) {
 175             case STATE_AMBIENT:
 176                for (i = 0; i < 3; i++) {
 177                   value[i] = ctx->Light.Light[ln].Ambient[i] *
 178                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][i];
 179                }
 180                /* [3] = material alpha */
 181                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_AMBIENT+face][3];
 182                return;
 183             case STATE_DIFFUSE:
 184                for (i = 0; i < 3; i++) {
 185                   value[i] = ctx->Light.Light[ln].Diffuse[i] *
 186                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][i];
 187                }
 188                /* [3] = material alpha */
 189                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_DIFFUSE+face][3];
 190                return;
 191             case STATE_SPECULAR:
 192                for (i = 0; i < 3; i++) {
 193                   value[i] = ctx->Light.Light[ln].Specular[i] *
 194                      ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][i];
 195                }
 196                /* [3] = material alpha */
 197                value[3] = ctx->Light.Material.Attrib[MAT_ATTRIB_FRONT_SPECULAR+face][3];
 198                return;
 199             default:
 200                _mesa_problem(ctx, "Invalid lightprod state in fetch_state");
 201                return;
 202          }
 203       }
 204    case STATE_TEXGEN:
 205       {
 206          /* state[1] is the texture unit */
 207          const GLuint unit = (GLuint) state[1];
 208          /* state[2] is the texgen attribute */
 209          switch (state[2]) {
 210          case STATE_TEXGEN_EYE_S:
 211             COPY_4V(value, ctx->Texture.Unit[unit].GenS.EyePlane);
 212             return;
 213          case STATE_TEXGEN_EYE_T:
 214             COPY_4V(value, ctx->Texture.Unit[unit].GenT.EyePlane);
 215             return;
 216          case STATE_TEXGEN_EYE_R:
 217             COPY_4V(value, ctx->Texture.Unit[unit].GenR.EyePlane);
 218             return;
 219          case STATE_TEXGEN_EYE_Q:
 220             COPY_4V(value, ctx->Texture.Unit[unit].GenQ.EyePlane);
 221             return;
 222          case STATE_TEXGEN_OBJECT_S:
 223             COPY_4V(value, ctx->Texture.Unit[unit].GenS.ObjectPlane);
 224             return;
 225          case STATE_TEXGEN_OBJECT_T:
 226             COPY_4V(value, ctx->Texture.Unit[unit].GenT.ObjectPlane);
 227             return;
 228          case STATE_TEXGEN_OBJECT_R:
 229             COPY_4V(value, ctx->Texture.Unit[unit].GenR.ObjectPlane);
 230             return;
 231          case STATE_TEXGEN_OBJECT_Q:
 232             COPY_4V(value, ctx->Texture.Unit[unit].GenQ.ObjectPlane);
 233             return;
 234          default:
 235             _mesa_problem(ctx, "Invalid texgen state in fetch_state");
 236             return;
 237          }
 238       }
 239    case STATE_TEXENV_COLOR:
 240       {
 241          /* state[1] is the texture unit */
 242          const GLuint unit = (GLuint) state[1];
 243          if (_mesa_get_clamp_fragment_color(ctx))
 244             COPY_4V(value, ctx->Texture.Unit[unit].EnvColor);
 245          else
 246             COPY_4V(value, ctx->Texture.Unit[unit].EnvColorUnclamped);
 247       }
 248       return;
 249    case STATE_FOG_COLOR:
 250       if (_mesa_get_clamp_fragment_color(ctx))
 251          COPY_4V(value, ctx->Fog.Color);
 252       else
 253          COPY_4V(value, ctx->Fog.ColorUnclamped);
 254       return;
 255    case STATE_FOG_PARAMS:
 256       value[0] = ctx->Fog.Density;
 257       value[1] = ctx->Fog.Start;
 258       value[2] = ctx->Fog.End;
 259       value[3] = 1.0f / (ctx->Fog.End - ctx->Fog.Start);
 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_SIZE:
 268       value[0] = ctx->Point.Size;
 269       value[1] = ctx->Point.MinSize;
 270       value[2] = ctx->Point.MaxSize;
 271       value[3] = ctx->Point.Threshold;
 272       return;
 273    case STATE_POINT_ATTENUATION:
 274       value[0] = ctx->Point.Params[0];
 275       value[1] = ctx->Point.Params[1];
 276       value[2] = ctx->Point.Params[2];
 277       value[3] = 1.0F;
 278       return;
 279    case STATE_MODELVIEW_MATRIX:
 280    case STATE_PROJECTION_MATRIX:
 281    case STATE_MVP_MATRIX:
 282    case STATE_TEXTURE_MATRIX:
 283    case STATE_PROGRAM_MATRIX:
 284       {
 285          /* state[0] = modelview, projection, texture, etc. */
 286          /* state[1] = which texture matrix or program matrix */
 287          /* state[2] = first row to fetch */
 288          /* state[3] = last row to fetch */
 289          /* state[4] = transpose, inverse or invtrans */
 290          const GLmatrix *matrix;
 291          const gl_state_index mat = state[0];
 292          const GLuint index = (GLuint) state[1];
 293          const GLuint firstRow = (GLuint) state[2];
 294          const GLuint lastRow = (GLuint) state[3];
 295          const gl_state_index modifier = state[4];
 296          const GLfloat *m;
 297          GLuint row, i;
 298          ASSERT(firstRow >= 0);
 299          ASSERT(firstRow < 4);
 300          ASSERT(lastRow >= 0);
 301          ASSERT(lastRow < 4);
 302          if (mat == STATE_MODELVIEW_MATRIX) {
 303             matrix = ctx->ModelviewMatrixStack.Top;
 304          }
 305          else if (mat == STATE_PROJECTION_MATRIX) {
 306             matrix = ctx->ProjectionMatrixStack.Top;
 307          }
 308          else if (mat == STATE_MVP_MATRIX) {
 309             matrix = &ctx->_ModelProjectMatrix;
 310          }
 311          else if (mat == STATE_TEXTURE_MATRIX) {
 312             ASSERT(index < Elements(ctx->TextureMatrixStack));
 313             matrix = ctx->TextureMatrixStack[index].Top;
 314          }
 315          else if (mat == STATE_PROGRAM_MATRIX) {
 316             ASSERT(index < Elements(ctx->ProgramMatrixStack));
 317             matrix = ctx->ProgramMatrixStack[index].Top;
 318          }
 319          else {
 320             _mesa_problem(ctx, "Bad matrix name in _mesa_fetch_state()");
 321             return;
 322          }
 323          if (modifier == STATE_MATRIX_INVERSE ||
 324              modifier == STATE_MATRIX_INVTRANS) {
 325             /* Be sure inverse is up to date:
 326              */
 327             _math_matrix_analyse( (GLmatrix*) matrix );
 328             m = matrix->inv;
 329          }
 330          else {
 331             m = matrix->m;
 332          }
 333          if (modifier == STATE_MATRIX_TRANSPOSE ||
 334              modifier == STATE_MATRIX_INVTRANS) {
 335             for (i = 0, row = firstRow; row <= lastRow; row++) {
 336                value[i++] = m[row * 4 + 0];
 337                value[i++] = m[row * 4 + 1];
 338                value[i++] = m[row * 4 + 2];
 339                value[i++] = m[row * 4 + 3];
 340             }
 341          }
 342          else {
 343             for (i = 0, row = firstRow; row <= lastRow; row++) {
 344                value[i++] = m[row + 0];
 345                value[i++] = m[row + 4];
 346                value[i++] = m[row + 8];
 347                value[i++] = m[row + 12];
 348             }
 349          }
 350       }
 351       return;
 352    case STATE_NUM_SAMPLES:
 353       ((int *)value)[0] = ctx->DrawBuffer->Visual.samples;
 354       return;
 355    case STATE_DEPTH_RANGE:
 356       value[0] = ctx->ViewportArray[0].Near;                /* near       */
 357       value[1] = ctx->ViewportArray[0].Far;                 /* far        */
 358       value[2] = ctx->ViewportArray[0].Far - ctx->ViewportArray[0].Near; /* far - near */
 359       value[3] = 1.0;
 360       return;
 361    case STATE_FRAGMENT_PROGRAM:
 362       {
 363          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 364          /* state[2] = parameter index          */
 365          const int idx = (int) state[2];
 366          switch (state[1]) {
 367             case STATE_ENV:
 368                COPY_4V(value, ctx->FragmentProgram.Parameters[idx]);
 369                return;
 370             case STATE_LOCAL:
 371                if (!ctx->FragmentProgram.Current->Base.LocalParams) {
 372                   ctx->FragmentProgram.Current->Base.LocalParams =
 373                      calloc(MAX_PROGRAM_LOCAL_PARAMS, sizeof(float[4]));
 374                   if (!ctx->FragmentProgram.Current->Base.LocalParams)
 375                      return;
 376                }
 377
 378                COPY_4V(value, ctx->FragmentProgram.Current->Base.LocalParams[idx]);
 379                return;
 380             default:
 381                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 382                return;
 383          }
 384       }
 385       return;
 386
 387    case STATE_VERTEX_PROGRAM:
 388       {
 389          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 390          /* state[2] = parameter index          */
 391          const int idx = (int) state[2];
 392          switch (state[1]) {
 393             case STATE_ENV:
 394                COPY_4V(value, ctx->VertexProgram.Parameters[idx]);
 395                return;
 396             case STATE_LOCAL:
 397                if (!ctx->VertexProgram.Current->Base.LocalParams) {
 398                   ctx->VertexProgram.Current->Base.LocalParams =
 399                      calloc(MAX_PROGRAM_LOCAL_PARAMS, sizeof(float[4]));
 400                   if (!ctx->VertexProgram.Current->Base.LocalParams)
 401                      return;
 402                }
 403
 404                COPY_4V(value, ctx->VertexProgram.Current->Base.LocalParams[idx]);
 405                return;
 406             default:
 407                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 408                return;
 409          }
 410       }
 411       return;
 412
 413    case STATE_NORMAL_SCALE:
 414       ASSIGN_4V(value, ctx->_ModelViewInvScale, 0, 0, 1);
 415       return;
 416
 417    case STATE_INTERNAL:
 418       switch (state[1]) {
 419       case STATE_CURRENT_ATTRIB:
 420          {
 421             const GLuint idx = (GLuint) state[2];
 422             COPY_4V(value, ctx->Current.Attrib[idx]);
 423          }
 424          return;
 425
 426       case STATE_CURRENT_ATTRIB_MAYBE_VP_CLAMPED:
 427          {
 428             const GLuint idx = (GLuint) state[2];
 429             if(ctx->Light._ClampVertexColor &&
 430                (idx == VERT_ATTRIB_COLOR0 ||
 431                 idx == VERT_ATTRIB_COLOR1)) {
 432                value[0] = CLAMP(ctx->Current.Attrib[idx][0], 0.0f, 1.0f);
 433                value[1] = CLAMP(ctx->Current.Attrib[idx][1], 0.0f, 1.0f);
 434                value[2] = CLAMP(ctx->Current.Attrib[idx][2], 0.0f, 1.0f);
 435                value[3] = CLAMP(ctx->Current.Attrib[idx][3], 0.0f, 1.0f);
 436             }
 437             else
 438                COPY_4V(value, ctx->Current.Attrib[idx]);
 439          }
 440          return;
 441
 442       case STATE_NORMAL_SCALE:
 443          ASSIGN_4V(value,
 444                    ctx->_ModelViewInvScale,
 445                    ctx->_ModelViewInvScale,
 446                    ctx->_ModelViewInvScale,
 447                    1);
 448          return;
 449
 450       case STATE_TEXRECT_SCALE:
 451          /* Value = { 1/texWidth, 1/texHeight, 0, 1 }.
 452           * Used to convert unnormalized texcoords to normalized texcoords.
 453           */
 454          {
 455             const int unit = (int) state[2];
 456             const struct gl_texture_object *texObj
 457                = ctx->Texture.Unit[unit]._Current;
 458             if (texObj) {
 459                struct gl_texture_image *texImage = texObj->Image[0][0];
 460                ASSIGN_4V(value,
 461                          (GLfloat) (1.0 / texImage->Width),
 462                          (GLfloat) (1.0 / texImage->Height),
 463                          0.0f, 1.0f);
 464             }
 465          }
 466          return;
 467
 468       case STATE_FOG_PARAMS_OPTIMIZED:
 469          /* for simpler per-vertex/pixel fog calcs. POW (for EXP/EXP2 fog)
 470           * might be more expensive than EX2 on some hw, plus it needs
 471           * another constant (e) anyway. Linear fog can now be done with a
 472           * single MAD.
 473           * linear: fogcoord * -1/(end-start) + end/(end-start)
 474           * exp: 2^-(density/ln(2) * fogcoord)
 475           * exp2: 2^-((density/(ln(2)^2) * fogcoord)^2)
 476           */
 477          value[0] = (ctx->Fog.End == ctx->Fog.Start)
 478             ? 1.0f : (GLfloat)(-1.0F / (ctx->Fog.End - ctx->Fog.Start));
 479          value[1] = ctx->Fog.End * -value[0];
 480          value[2] = (GLfloat)(ctx->Fog.Density * M_LOG2E); /* M_LOG2E == 1/ln(2) */
 481          value[3] = (GLfloat)(ctx->Fog.Density * ONE_DIV_SQRT_LN2);
 482          return;
 483
 484       case STATE_POINT_SIZE_CLAMPED:
 485          {
 486            /* this includes implementation dependent limits, to avoid
 487             * another potentially necessary clamp.
 488             * Note: for sprites, point smooth (point AA) is ignored
 489             * and we'll clamp to MinPointSizeAA and MaxPointSize, because we
 490             * expect drivers will want to say their minimum for AA size is 0.0
 491             * but for non-AA it's 1.0 (because normal points with size below 1.0
 492             * need to get rounded up to 1.0, hence never disappear). GL does
 493             * not specify max clamp size for sprites, other than it needs to be
 494             * at least as large as max AA size, hence use non-AA size there.
 495             */
 496             GLfloat minImplSize;
 497             GLfloat maxImplSize;
 498             if (ctx->Point.PointSprite) {
 499                minImplSize = ctx->Const.MinPointSizeAA;
 500                maxImplSize = ctx->Const.MaxPointSize;
 501             }
 502             else if (ctx->Point.SmoothFlag || ctx->Multisample._Enabled) {
 503                minImplSize = ctx->Const.MinPointSizeAA;
 504                maxImplSize = ctx->Const.MaxPointSizeAA;
 505             }
 506             else {
 507                minImplSize = ctx->Const.MinPointSize;
 508                maxImplSize = ctx->Const.MaxPointSize;
 509             }
 510             value[0] = ctx->Point.Size;
 511             value[1] = ctx->Point.MinSize >= minImplSize ? ctx->Point.MinSize : minImplSize;
 512             value[2] = ctx->Point.MaxSize <= maxImplSize ? ctx->Point.MaxSize : maxImplSize;
 513             value[3] = ctx->Point.Threshold;
 514          }
 515          return;
 516       case STATE_LIGHT_SPOT_DIR_NORMALIZED:
 517          {
 518             /* here, state[2] is the light number */
 519             /* pre-normalize spot dir */
 520             const GLuint ln = (GLuint) state[2];
 521             COPY_3V(value, ctx->Light.Light[ln]._NormSpotDirection);
 522             value[3] = ctx->Light.Light[ln]._CosCutoff;
 523          }
 524          return;
 525
 526       case STATE_LIGHT_POSITION:
 527          {
 528             const GLuint ln = (GLuint) state[2];
 529             COPY_4V(value, ctx->Light.Light[ln]._Position);
 530          }
 531          return;
 532
 533       case STATE_LIGHT_POSITION_NORMALIZED:
 534          {
 535             const GLuint ln = (GLuint) state[2];
 536             COPY_4V(value, ctx->Light.Light[ln]._Position);
 537             NORMALIZE_3FV( value );
 538          }
 539          return;
 540
 541       case STATE_LIGHT_HALF_VECTOR:
 542          {
 543             const GLuint ln = (GLuint) state[2];
 544             GLfloat p[3];
 545             /* Compute infinite half angle vector:
 546              *   halfVector = normalize(normalize(lightPos) + (0, 0, 1))
 547              * light.EyePosition.w should be 0 for infinite lights.
 548              */
 549             COPY_3V(p, ctx->Light.Light[ln]._Position);
 550             NORMALIZE_3FV(p);
 551             ADD_3V(value, p, ctx->_EyeZDir);
 552             NORMALIZE_3FV(value);
 553             value[3] = 1.0;
 554          }
 555          return;
 556
 557       case STATE_PT_SCALE:
 558          value[0] = ctx->Pixel.RedScale;
 559          value[1] = ctx->Pixel.GreenScale;
 560          value[2] = ctx->Pixel.BlueScale;
 561          value[3] = ctx->Pixel.AlphaScale;
 562          return;
 563
 564       case STATE_PT_BIAS:
 565          value[0] = ctx->Pixel.RedBias;
 566          value[1] = ctx->Pixel.GreenBias;
 567          value[2] = ctx->Pixel.BlueBias;
 568          value[3] = ctx->Pixel.AlphaBias;
 569          return;
 570
 571       case STATE_FB_SIZE:
 572          value[0] = (GLfloat) (ctx->DrawBuffer->Width - 1);
 573          value[1] = (GLfloat) (ctx->DrawBuffer->Height - 1);
 574          value[2] = 0.0F;
 575          value[3] = 0.0F;
 576          return;
 577
 578       case STATE_FB_WPOS_Y_TRANSFORM:
 579          /* A driver may negate this conditional by using ZW swizzle
 580           * instead of XY (based on e.g. some other state). */
 581          if (_mesa_is_user_fbo(ctx->DrawBuffer)) {
 582             /* Identity (XY) followed by flipping Y upside down (ZW). */
 583             value[0] = 1.0F;
 584             value[1] = 0.0F;
 585             value[2] = -1.0F;
 586             value[3] = (GLfloat) ctx->DrawBuffer->Height;
 587          } else {
 588             /* Flipping Y upside down (XY) followed by identity (ZW). */
 589             value[0] = -1.0F;
 590             value[1] = (GLfloat) ctx->DrawBuffer->Height;
 591             value[2] = 1.0F;
 592             value[3] = 0.0F;
 593          }
 594          return;
 595
 596       /* XXX: make sure new tokens added here are also handled in the
 597        * _mesa_program_state_flags() switch, below.
 598        */
 599       default:
 600          /* Unknown state indexes are silently ignored here.
 601           * Drivers may do something special.
 602           */
 603          return;
 604       }
 605       return;
 606
 607    default:
 608       _mesa_problem(ctx, "Invalid state in _mesa_fetch_state");
 609       return;
 610    }
 611 }
 612
 613
 614 /**
 615  * Return a bitmask of the Mesa state flags (_NEW_* values) which would
 616  * indicate that the given context state may have changed.
 617  * The bitmask is used during validation to determine if we need to update
 618  * vertex/fragment program parameters (like "state.material.color") when
 619  * some GL state has changed.
 620  */
 621 GLbitfield
 622 _mesa_program_state_flags(const gl_state_index state[STATE_LENGTH])
 623 {
 624    switch (state[0]) {
 625    case STATE_MATERIAL:
 626    case STATE_LIGHTPROD:
 627    case STATE_LIGHTMODEL_SCENECOLOR:
 628       /* these can be effected by glColor when colormaterial mode is used */
 629       return _NEW_LIGHT | _NEW_CURRENT_ATTRIB;
 630
 631    case STATE_LIGHT:
 632    case STATE_LIGHTMODEL_AMBIENT:
 633       return _NEW_LIGHT;
 634
 635    case STATE_TEXGEN:
 636       return _NEW_TEXTURE;
 637    case STATE_TEXENV_COLOR:
 638       return _NEW_TEXTURE | _NEW_BUFFERS | _NEW_FRAG_CLAMP;
 639
 640    case STATE_FOG_COLOR:
 641       return _NEW_FOG | _NEW_BUFFERS | _NEW_FRAG_CLAMP;
 642    case STATE_FOG_PARAMS:
 643       return _NEW_FOG;
 644
 645    case STATE_CLIPPLANE:
 646       return _NEW_TRANSFORM;
 647
 648    case STATE_POINT_SIZE:
 649    case STATE_POINT_ATTENUATION:
 650       return _NEW_POINT;
 651
 652    case STATE_MODELVIEW_MATRIX:
 653       return _NEW_MODELVIEW;
 654    case STATE_PROJECTION_MATRIX:
 655       return _NEW_PROJECTION;
 656    case STATE_MVP_MATRIX:
 657       return _NEW_MODELVIEW | _NEW_PROJECTION;
 658    case STATE_TEXTURE_MATRIX:
 659       return _NEW_TEXTURE_MATRIX;
 660    case STATE_PROGRAM_MATRIX:
 661       return _NEW_TRACK_MATRIX;
 662
 663    case STATE_NUM_SAMPLES:
 664       return _NEW_BUFFERS;
 665
 666    case STATE_DEPTH_RANGE:
 667       return _NEW_VIEWPORT;
 668
 669    case STATE_FRAGMENT_PROGRAM:
 670    case STATE_VERTEX_PROGRAM:
 671       return _NEW_PROGRAM;
 672
 673    case STATE_NORMAL_SCALE:
 674       return _NEW_MODELVIEW;
 675
 676    case STATE_INTERNAL:
 677       switch (state[1]) {
 678       case STATE_CURRENT_ATTRIB:
 679          return _NEW_CURRENT_ATTRIB;
 680       case STATE_CURRENT_ATTRIB_MAYBE_VP_CLAMPED:
 681          return _NEW_CURRENT_ATTRIB | _NEW_LIGHT | _NEW_BUFFERS;
 682
 683       case STATE_NORMAL_SCALE:
 684          return _NEW_MODELVIEW;
 685
 686       case STATE_TEXRECT_SCALE:
 687          return _NEW_TEXTURE;
 688       case STATE_FOG_PARAMS_OPTIMIZED:
 689          return _NEW_FOG;
 690       case STATE_POINT_SIZE_CLAMPED:
 691          return _NEW_POINT | _NEW_MULTISAMPLE;
 692       case STATE_LIGHT_SPOT_DIR_NORMALIZED:
 693       case STATE_LIGHT_POSITION:
 694       case STATE_LIGHT_POSITION_NORMALIZED:
 695       case STATE_LIGHT_HALF_VECTOR:
 696          return _NEW_LIGHT;
 697
 698       case STATE_PT_SCALE:
 699       case STATE_PT_BIAS:
 700          return _NEW_PIXEL;
 701
 702       case STATE_FB_SIZE:
 703       case STATE_FB_WPOS_Y_TRANSFORM:
 704          return _NEW_BUFFERS;
 705
 706       default:
 707          /* unknown state indexes are silently ignored and
 708          *  no flag set, since it is handled by the driver.
 709          */
 710          return 0;
 711       }
 712
 713    default:
 714       _mesa_problem(NULL, "unexpected state[0] in make_state_flags()");
 715       return 0;
 716    }
 717 }
 718
 719
 720 static void
 721 append(char *dst, const char *src)
 722 {
 723    while (*dst)
 724       dst++;
 725    while (*src)
 726      *dst++ = *src++;
 727    *dst = 0;
 728 }
 729
 730
 731 /**
 732  * Convert token 'k' to a string, append it onto 'dst' string.
 733  */
 734 static void
 735 append_token(char *dst, gl_state_index k)
 736 {
 737    switch (k) {
 738    case STATE_MATERIAL:
 739       append(dst, "material");
 740       break;
 741    case STATE_LIGHT:
 742       append(dst, "light");
 743       break;
 744    case STATE_LIGHTMODEL_AMBIENT:
 745       append(dst, "lightmodel.ambient");
 746       break;
 747    case STATE_LIGHTMODEL_SCENECOLOR:
 748       break;
 749    case STATE_LIGHTPROD:
 750       append(dst, "lightprod");
 751       break;
 752    case STATE_TEXGEN:
 753       append(dst, "texgen");
 754       break;
 755    case STATE_FOG_COLOR:
 756       append(dst, "fog.color");
 757       break;
 758    case STATE_FOG_PARAMS:
 759       append(dst, "fog.params");
 760       break;
 761    case STATE_CLIPPLANE:
 762       append(dst, "clip");
 763       break;
 764    case STATE_POINT_SIZE:
 765       append(dst, "point.size");
 766       break;
 767    case STATE_POINT_ATTENUATION:
 768       append(dst, "point.attenuation");
 769       break;
 770    case STATE_MODELVIEW_MATRIX:
 771       append(dst, "matrix.modelview");
 772       break;
 773    case STATE_PROJECTION_MATRIX:
 774       append(dst, "matrix.projection");
 775       break;
 776    case STATE_MVP_MATRIX:
 777       append(dst, "matrix.mvp");
 778       break;
 779    case STATE_TEXTURE_MATRIX:
 780       append(dst, "matrix.texture");
 781       break;
 782    case STATE_PROGRAM_MATRIX:
 783       append(dst, "matrix.program");
 784       break;
 785    case STATE_MATRIX_INVERSE:
 786       append(dst, ".inverse");
 787       break;
 788    case STATE_MATRIX_TRANSPOSE:
 789       append(dst, ".transpose");
 790       break;
 791    case STATE_MATRIX_INVTRANS:
 792       append(dst, ".invtrans");
 793       break;
 794    case STATE_AMBIENT:
 795       append(dst, ".ambient");
 796       break;
 797    case STATE_DIFFUSE:
 798       append(dst, ".diffuse");
 799       break;
 800    case STATE_SPECULAR:
 801       append(dst, ".specular");
 802       break;
 803    case STATE_EMISSION:
 804       append(dst, ".emission");
 805       break;
 806    case STATE_SHININESS:
 807       append(dst, "lshininess");
 808       break;
 809    case STATE_HALF_VECTOR:
 810       append(dst, ".half");
 811       break;
 812    case STATE_POSITION:
 813       append(dst, ".position");
 814       break;
 815    case STATE_ATTENUATION:
 816       append(dst, ".attenuation");
 817       break;
 818    case STATE_SPOT_DIRECTION:
 819       append(dst, ".spot.direction");
 820       break;
 821    case STATE_SPOT_CUTOFF:
 822       append(dst, ".spot.cutoff");
 823       break;
 824    case STATE_TEXGEN_EYE_S:
 825       append(dst, ".eye.s");
 826       break;
 827    case STATE_TEXGEN_EYE_T:
 828       append(dst, ".eye.t");
 829       break;
 830    case STATE_TEXGEN_EYE_R:
 831       append(dst, ".eye.r");
 832       break;
 833    case STATE_TEXGEN_EYE_Q:
 834       append(dst, ".eye.q");
 835       break;
 836    case STATE_TEXGEN_OBJECT_S:
 837       append(dst, ".object.s");
 838       break;
 839    case STATE_TEXGEN_OBJECT_T:
 840       append(dst, ".object.t");
 841       break;
 842    case STATE_TEXGEN_OBJECT_R:
 843       append(dst, ".object.r");
 844       break;
 845    case STATE_TEXGEN_OBJECT_Q:
 846       append(dst, ".object.q");
 847       break;
 848    case STATE_TEXENV_COLOR:
 849       append(dst, "texenv");
 850       break;
 851    case STATE_NUM_SAMPLES:
 852       append(dst, "numsamples");
 853       break;
 854    case STATE_DEPTH_RANGE:
 855       append(dst, "depth.range");
 856       break;
 857    case STATE_VERTEX_PROGRAM:
 858    case STATE_FRAGMENT_PROGRAM:
 859       break;
 860    case STATE_ENV:
 861       append(dst, "env");
 862       break;
 863    case STATE_LOCAL:
 864       append(dst, "local");
 865       break;
 866    /* BEGIN internal state vars */
 867    case STATE_INTERNAL:
 868       append(dst, ".internal.");
 869       break;
 870    case STATE_CURRENT_ATTRIB:
 871       append(dst, "current");
 872       break;
 873    case STATE_CURRENT_ATTRIB_MAYBE_VP_CLAMPED:
 874       append(dst, "currentAttribMaybeVPClamped");
 875       break;
 876    case STATE_NORMAL_SCALE:
 877       append(dst, "normalScale");
 878       break;
 879    case STATE_TEXRECT_SCALE:
 880       append(dst, "texrectScale");
 881       break;
 882    case STATE_FOG_PARAMS_OPTIMIZED:
 883       append(dst, "fogParamsOptimized");
 884       break;
 885    case STATE_POINT_SIZE_CLAMPED:
 886       append(dst, "pointSizeClamped");
 887       break;
 888    case STATE_LIGHT_SPOT_DIR_NORMALIZED:
 889       append(dst, "lightSpotDirNormalized");
 890       break;
 891    case STATE_LIGHT_POSITION:
 892       append(dst, "lightPosition");
 893       break;
 894    case STATE_LIGHT_POSITION_NORMALIZED:
 895       append(dst, "light.position.normalized");
 896       break;
 897    case STATE_LIGHT_HALF_VECTOR:
 898       append(dst, "lightHalfVector");
 899       break;
 900    case STATE_PT_SCALE:
 901       append(dst, "PTscale");
 902       break;
 903    case STATE_PT_BIAS:
 904       append(dst, "PTbias");
 905       break;
 906    case STATE_FB_SIZE:
 907       append(dst, "FbSize");
 908       break;
 909    case STATE_FB_WPOS_Y_TRANSFORM:
 910       append(dst, "FbWposYTransform");
 911       break;
 912    default:
 913       /* probably STATE_INTERNAL_DRIVER+i (driver private state) */
 914       append(dst, "driverState");
 915    }
 916 }
 917
 918 static void
 919 append_face(char *dst, GLint face)
 920 {
 921    if (face == 0)
 922       append(dst, "front.");
 923    else
 924       append(dst, "back.");
 925 }
 926
 927 static void
 928 append_index(char *dst, GLint index)
 929 {
 930    char s[20];
 931    sprintf(s, "[%d]", index);
 932    append(dst, s);
 933 }
 934
 935 /**
 936  * Make a string from the given state vector.
 937  * For example, return "state.matrix.texture[2].inverse".
 938  * Use free() to deallocate the string.
 939  */
 940 char *
 941 _mesa_program_state_string(const gl_state_index state[STATE_LENGTH])
 942 {
 943    char str[1000] = "";
 944    char tmp[30];
 945
 946    append(str, "state.");
 947    append_token(str, state[0]);
 948
 949    switch (state[0]) {
 950    case STATE_MATERIAL:
 951       append_face(str, state[1]);
 952       append_token(str, state[2]);
 953       break;
 954    case STATE_LIGHT:
 955       append_index(str, state[1]); /* light number [i]. */
 956       append_token(str, state[2]); /* coefficients */
 957       break;
 958    case STATE_LIGHTMODEL_AMBIENT:
 959       append(str, "lightmodel.ambient");
 960       break;
 961    case STATE_LIGHTMODEL_SCENECOLOR:
 962       if (state[1] == 0) {
 963          append(str, "lightmodel.front.scenecolor");
 964       }
 965       else {
 966          append(str, "lightmodel.back.scenecolor");
 967       }
 968       break;
 969    case STATE_LIGHTPROD:
 970       append_index(str, state[1]); /* light number [i]. */
 971       append_face(str, state[2]);
 972       append_token(str, state[3]);
 973       break;
 974    case STATE_TEXGEN:
 975       append_index(str, state[1]); /* tex unit [i] */
 976       append_token(str, state[2]); /* plane coef */
 977       break;
 978    case STATE_TEXENV_COLOR:
 979       append_index(str, state[1]); /* tex unit [i] */
 980       append(str, "color");
 981       break;
 982    case STATE_CLIPPLANE:
 983       append_index(str, state[1]); /* plane [i] */
 984       append(str, ".plane");
 985       break;
 986    case STATE_MODELVIEW_MATRIX:
 987    case STATE_PROJECTION_MATRIX:
 988    case STATE_MVP_MATRIX:
 989    case STATE_TEXTURE_MATRIX:
 990    case STATE_PROGRAM_MATRIX:
 991       {
 992          /* state[0] = modelview, projection, texture, etc. */
 993          /* state[1] = which texture matrix or program matrix */
 994          /* state[2] = first row to fetch */
 995          /* state[3] = last row to fetch */
 996          /* state[4] = transpose, inverse or invtrans */
 997          const gl_state_index mat = state[0];
 998          const GLuint index = (GLuint) state[1];
 999          const GLuint firstRow = (GLuint) state[2];
1000          const GLuint lastRow = (GLuint) state[3];
1001          const gl_state_index modifier = state[4];
1002          if (index ||
1003              mat == STATE_TEXTURE_MATRIX ||
1004              mat == STATE_PROGRAM_MATRIX)
1005             append_index(str, index);
1006          if (modifier)
1007             append_token(str, modifier);
1008          if (firstRow == lastRow)
1009             sprintf(tmp, ".row[%d]", firstRow);
1010          else
1011             sprintf(tmp, ".row[%d..%d]", firstRow, lastRow);
1012          append(str, tmp);
1013       }
1014       break;
1015    case STATE_POINT_SIZE:
1016       break;
1017    case STATE_POINT_ATTENUATION:
1018       break;
1019    case STATE_FOG_PARAMS:
1020       break;
1021    case STATE_FOG_COLOR:
1022       break;
1023    case STATE_NUM_SAMPLES:
1024       break;
1025    case STATE_DEPTH_RANGE:
1026       break;
1027    case STATE_FRAGMENT_PROGRAM:
1028    case STATE_VERTEX_PROGRAM:
1029       /* state[1] = {STATE_ENV, STATE_LOCAL} */
1030       /* state[2] = parameter index          */
1031       append_token(str, state[1]);
1032       append_index(str, state[2]);
1033       break;
1034    case STATE_NORMAL_SCALE:
1035       break;
1036    case STATE_INTERNAL:
1037       append_token(str, state[1]);
1038       if (state[1] == STATE_CURRENT_ATTRIB)
1039          append_index(str, state[2]);
1040        break;
1041    default:
1042       _mesa_problem(NULL, "Invalid state in _mesa_program_state_string");
1043       break;
1044    }
1045
1046    return _mesa_strdup(str);
1047 }
1048
1049
1050 /**
1051  * Loop over all the parameters in a parameter list.  If the parameter
1052  * is a GL state reference, look up the current value of that state
1053  * variable and put it into the parameter's Value[4] array.
1054  * Other parameter types never change or are explicitly set by the user
1055  * with glUniform() or glProgramParameter(), etc.
1056  * This would be called at glBegin time.
1057  */
1058 void
1059 _mesa_load_state_parameters(struct gl_context *ctx,
1060                             struct gl_program_parameter_list *paramList)
1061 {
1062    GLuint i;
1063
1064    if (!paramList)
1065       return;
1066
1067    for (i = 0; i < paramList->NumParameters; i++) {
1068       if (paramList->Parameters[i].Type == PROGRAM_STATE_VAR) {
1069          _mesa_fetch_state(ctx,
1070                            paramList->Parameters[i].StateIndexes,
1071                            &paramList->ParameterValues[i][0].f);
1072       }
1073    }
1074 }