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 < 4);
 299          assert(lastRow < 4);
 300          if (mat == STATE_MODELVIEW_MATRIX) {
 301             matrix = ctx->ModelviewMatrixStack.Top;
 302          }
 303          else if (mat == STATE_PROJECTION_MATRIX) {
 304             matrix = ctx->ProjectionMatrixStack.Top;
 305          }
 306          else if (mat == STATE_MVP_MATRIX) {
 307             matrix = &ctx->_ModelProjectMatrix;
 308          }
 309          else if (mat == STATE_TEXTURE_MATRIX) {
 310             assert(index < Elements(ctx->TextureMatrixStack));
 311             matrix = ctx->TextureMatrixStack[index].Top;
 312          }
 313          else if (mat == STATE_PROGRAM_MATRIX) {
 314             assert(index < Elements(ctx->ProgramMatrixStack));
 315             matrix = ctx->ProgramMatrixStack[index].Top;
 316          }
 317          else {
 318             _mesa_problem(ctx, "Bad matrix name in _mesa_fetch_state()");
 319             return;
 320          }
 321          if (modifier == STATE_MATRIX_INVERSE ||
 322              modifier == STATE_MATRIX_INVTRANS) {
 323             /* Be sure inverse is up to date:
 324              */
 325             _math_matrix_analyse( (GLmatrix*) matrix );
 326             m = matrix->inv;
 327          }
 328          else {
 329             m = matrix->m;
 330          }
 331          if (modifier == STATE_MATRIX_TRANSPOSE ||
 332              modifier == STATE_MATRIX_INVTRANS) {
 333             for (i = 0, row = firstRow; row <= lastRow; row++) {
 334                value[i++] = m[row * 4 + 0];
 335                value[i++] = m[row * 4 + 1];
 336                value[i++] = m[row * 4 + 2];
 337                value[i++] = m[row * 4 + 3];
 338             }
 339          }
 340          else {
 341             for (i = 0, row = firstRow; row <= lastRow; row++) {
 342                value[i++] = m[row + 0];
 343                value[i++] = m[row + 4];
 344                value[i++] = m[row + 8];
 345                value[i++] = m[row + 12];
 346             }
 347          }
 348       }
 349       return;
 350    case STATE_NUM_SAMPLES:
 351       ((int *)value)[0] = ctx->DrawBuffer->Visual.samples;
 352       return;
 353    case STATE_DEPTH_RANGE:
 354       value[0] = ctx->ViewportArray[0].Near;                /* near       */
 355       value[1] = ctx->ViewportArray[0].Far;                 /* far        */
 356       value[2] = ctx->ViewportArray[0].Far - ctx->ViewportArray[0].Near; /* far - near */
 357       value[3] = 1.0;
 358       return;
 359    case STATE_FRAGMENT_PROGRAM:
 360       {
 361          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 362          /* state[2] = parameter index          */
 363          const int idx = (int) state[2];
 364          switch (state[1]) {
 365             case STATE_ENV:
 366                COPY_4V(value, ctx->FragmentProgram.Parameters[idx]);
 367                return;
 368             case STATE_LOCAL:
 369                if (!ctx->FragmentProgram.Current->Base.LocalParams) {
 370                   ctx->FragmentProgram.Current->Base.LocalParams =
 371                      calloc(MAX_PROGRAM_LOCAL_PARAMS, sizeof(float[4]));
 372                   if (!ctx->FragmentProgram.Current->Base.LocalParams)
 373                      return;
 374                }
 375
 376                COPY_4V(value, ctx->FragmentProgram.Current->Base.LocalParams[idx]);
 377                return;
 378             default:
 379                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 380                return;
 381          }
 382       }
 383       return;
 384
 385    case STATE_VERTEX_PROGRAM:
 386       {
 387          /* state[1] = {STATE_ENV, STATE_LOCAL} */
 388          /* state[2] = parameter index          */
 389          const int idx = (int) state[2];
 390          switch (state[1]) {
 391             case STATE_ENV:
 392                COPY_4V(value, ctx->VertexProgram.Parameters[idx]);
 393                return;
 394             case STATE_LOCAL:
 395                if (!ctx->VertexProgram.Current->Base.LocalParams) {
 396                   ctx->VertexProgram.Current->Base.LocalParams =
 397                      calloc(MAX_PROGRAM_LOCAL_PARAMS, sizeof(float[4]));
 398                   if (!ctx->VertexProgram.Current->Base.LocalParams)
 399                      return;
 400                }
 401
 402                COPY_4V(value, ctx->VertexProgram.Current->Base.LocalParams[idx]);
 403                return;
 404             default:
 405                _mesa_problem(ctx, "Bad state switch in _mesa_fetch_state()");
 406                return;
 407          }
 408       }
 409       return;
 410
 411    case STATE_NORMAL_SCALE:
 412       ASSIGN_4V(value, ctx->_ModelViewInvScale, 0, 0, 1);
 413       return;
 414
 415    case STATE_INTERNAL:
 416       switch (state[1]) {
 417       case STATE_CURRENT_ATTRIB:
 418          {
 419             const GLuint idx = (GLuint) state[2];
 420             COPY_4V(value, ctx->Current.Attrib[idx]);
 421          }
 422          return;
 423
 424       case STATE_CURRENT_ATTRIB_MAYBE_VP_CLAMPED:
 425          {
 426             const GLuint idx = (GLuint) state[2];
 427             if(ctx->Light._ClampVertexColor &&
 428                (idx == VERT_ATTRIB_COLOR0 ||
 429                 idx == VERT_ATTRIB_COLOR1)) {
 430                value[0] = CLAMP(ctx->Current.Attrib[idx][0], 0.0f, 1.0f);
 431                value[1] = CLAMP(ctx->Current.Attrib[idx][1], 0.0f, 1.0f);
 432                value[2] = CLAMP(ctx->Current.Attrib[idx][2], 0.0f, 1.0f);
 433                value[3] = CLAMP(ctx->Current.Attrib[idx][3], 0.0f, 1.0f);
 434             }
 435             else
 436                COPY_4V(value, ctx->Current.Attrib[idx]);
 437          }
 438          return;
 439
 440       case STATE_NORMAL_SCALE:
 441          ASSIGN_4V(value,
 442                    ctx->_ModelViewInvScale,
 443                    ctx->_ModelViewInvScale,
 444                    ctx->_ModelViewInvScale,
 445                    1);
 446          return;
 447
 448       case STATE_TEXRECT_SCALE:
 449          /* Value = { 1/texWidth, 1/texHeight, 0, 1 }.
 450           * Used to convert unnormalized texcoords to normalized texcoords.
 451           */
 452          {
 453             const int unit = (int) state[2];
 454             const struct gl_texture_object *texObj
 455                = ctx->Texture.Unit[unit]._Current;
 456             if (texObj) {
 457                struct gl_texture_image *texImage = texObj->Image[0][0];
 458                ASSIGN_4V(value,
 459                          (GLfloat) (1.0 / texImage->Width),
 460                          (GLfloat) (1.0 / texImage->Height),
 461                          0.0f, 1.0f);
 462             }
 463          }
 464          return;
 465
 466       case STATE_FOG_PARAMS_OPTIMIZED:
 467          /* for simpler per-vertex/pixel fog calcs. POW (for EXP/EXP2 fog)
 468           * might be more expensive than EX2 on some hw, plus it needs
 469           * another constant (e) anyway. Linear fog can now be done with a
 470           * single MAD.
 471           * linear: fogcoord * -1/(end-start) + end/(end-start)
 472           * exp: 2^-(density/ln(2) * fogcoord)
 473           * exp2: 2^-((density/(ln(2)^2) * fogcoord)^2)
 474           */
 475          value[0] = (ctx->Fog.End == ctx->Fog.Start)
 476             ? 1.0f : (GLfloat)(-1.0F / (ctx->Fog.End - ctx->Fog.Start));
 477          value[1] = ctx->Fog.End * -value[0];
 478          value[2] = (GLfloat)(ctx->Fog.Density * M_LOG2E); /* M_LOG2E == 1/ln(2) */
 479          value[3] = (GLfloat)(ctx->Fog.Density * ONE_DIV_SQRT_LN2);
 480          return;
 481
 482       case STATE_POINT_SIZE_CLAMPED:
 483          {
 484            /* this includes implementation dependent limits, to avoid
 485             * another potentially necessary clamp.
 486             * Note: for sprites, point smooth (point AA) is ignored
 487             * and we'll clamp to MinPointSizeAA and MaxPointSize, because we
 488             * expect drivers will want to say their minimum for AA size is 0.0
 489             * but for non-AA it's 1.0 (because normal points with size below 1.0
 490             * need to get rounded up to 1.0, hence never disappear). GL does
 491             * not specify max clamp size for sprites, other than it needs to be
 492             * at least as large as max AA size, hence use non-AA size there.
 493             */
 494             GLfloat minImplSize;
 495             GLfloat maxImplSize;
 496             if (ctx->Point.PointSprite) {
 497                minImplSize = ctx->Const.MinPointSizeAA;
 498                maxImplSize = ctx->Const.MaxPointSize;
 499             }
 500             else if (ctx->Point.SmoothFlag || ctx->Multisample._Enabled) {
 501                minImplSize = ctx->Const.MinPointSizeAA;
 502                maxImplSize = ctx->Const.MaxPointSizeAA;
 503             }
 504             else {
 505                minImplSize = ctx->Const.MinPointSize;
 506                maxImplSize = ctx->Const.MaxPointSize;
 507             }
 508             value[0] = ctx->Point.Size;
 509             value[1] = ctx->Point.MinSize >= minImplSize ? ctx->Point.MinSize : minImplSize;
 510             value[2] = ctx->Point.MaxSize <= maxImplSize ? ctx->Point.MaxSize : maxImplSize;
 511             value[3] = ctx->Point.Threshold;
 512          }
 513          return;
 514       case STATE_LIGHT_SPOT_DIR_NORMALIZED:
 515          {
 516             /* here, state[2] is the light number */
 517             /* pre-normalize spot dir */
 518             const GLuint ln = (GLuint) state[2];
 519             COPY_3V(value, ctx->Light.Light[ln]._NormSpotDirection);
 520             value[3] = ctx->Light.Light[ln]._CosCutoff;
 521          }
 522          return;
 523
 524       case STATE_LIGHT_POSITION:
 525          {
 526             const GLuint ln = (GLuint) state[2];
 527             COPY_4V(value, ctx->Light.Light[ln]._Position);
 528          }
 529          return;
 530
 531       case STATE_LIGHT_POSITION_NORMALIZED:
 532          {
 533             const GLuint ln = (GLuint) state[2];
 534             COPY_4V(value, ctx->Light.Light[ln]._Position);
 535             NORMALIZE_3FV( value );
 536          }
 537          return;
 538
 539       case STATE_LIGHT_HALF_VECTOR:
 540          {
 541             const GLuint ln = (GLuint) state[2];
 542             GLfloat p[3];
 543             /* Compute infinite half angle vector:
 544              *   halfVector = normalize(normalize(lightPos) + (0, 0, 1))
 545              * light.EyePosition.w should be 0 for infinite lights.
 546              */
 547             COPY_3V(p, ctx->Light.Light[ln]._Position);
 548             NORMALIZE_3FV(p);
 549             ADD_3V(value, p, ctx->_EyeZDir);
 550             NORMALIZE_3FV(value);
 551             value[3] = 1.0;
 552          }
 553          return;
 554
 555       case STATE_PT_SCALE:
 556          value[0] = ctx->Pixel.RedScale;
 557          value[1] = ctx->Pixel.GreenScale;
 558          value[2] = ctx->Pixel.BlueScale;
 559          value[3] = ctx->Pixel.AlphaScale;
 560          return;
 561
 562       case STATE_PT_BIAS:
 563          value[0] = ctx->Pixel.RedBias;
 564          value[1] = ctx->Pixel.GreenBias;
 565          value[2] = ctx->Pixel.BlueBias;
 566          value[3] = ctx->Pixel.AlphaBias;
 567          return;
 568
 569       case STATE_FB_SIZE:
 570          value[0] = (GLfloat) (ctx->DrawBuffer->Width - 1);
 571          value[1] = (GLfloat) (ctx->DrawBuffer->Height - 1);
 572          value[2] = 0.0F;
 573          value[3] = 0.0F;
 574          return;
 575
 576       case STATE_FB_WPOS_Y_TRANSFORM:
 577          /* A driver may negate this conditional by using ZW swizzle
 578           * instead of XY (based on e.g. some other state). */
 579          if (_mesa_is_user_fbo(ctx->DrawBuffer)) {
 580             /* Identity (XY) followed by flipping Y upside down (ZW). */
 581             value[0] = 1.0F;
 582             value[1] = 0.0F;
 583             value[2] = -1.0F;
 584             value[3] = (GLfloat) ctx->DrawBuffer->Height;
 585          } else {
 586             /* Flipping Y upside down (XY) followed by identity (ZW). */
 587             value[0] = -1.0F;
 588             value[1] = (GLfloat) ctx->DrawBuffer->Height;
 589             value[2] = 1.0F;
 590             value[3] = 0.0F;
 591          }
 592          return;
 593
 594       /* XXX: make sure new tokens added here are also handled in the
 595        * _mesa_program_state_flags() switch, below.
 596        */
 597       default:
 598          /* Unknown state indexes are silently ignored here.
 599           * Drivers may do something special.
 600           */
 601          return;
 602       }
 603       return;
 604
 605    default:
 606       _mesa_problem(ctx, "Invalid state in _mesa_fetch_state");
 607       return;
 608    }
 609 }
 610
 611
 612 /**
 613  * Return a bitmask of the Mesa state flags (_NEW_* values) which would
 614  * indicate that the given context state may have changed.
 615  * The bitmask is used during validation to determine if we need to update
 616  * vertex/fragment program parameters (like "state.material.color") when
 617  * some GL state has changed.
 618  */
 619 GLbitfield
 620 _mesa_program_state_flags(const gl_state_index state[STATE_LENGTH])
 621 {
 622    switch (state[0]) {
 623    case STATE_MATERIAL:
 624    case STATE_LIGHTPROD:
 625    case STATE_LIGHTMODEL_SCENECOLOR:
 626       /* these can be effected by glColor when colormaterial mode is used */
 627       return _NEW_LIGHT | _NEW_CURRENT_ATTRIB;
 628
 629    case STATE_LIGHT:
 630    case STATE_LIGHTMODEL_AMBIENT:
 631       return _NEW_LIGHT;
 632
 633    case STATE_TEXGEN:
 634       return _NEW_TEXTURE;
 635    case STATE_TEXENV_COLOR:
 636       return _NEW_TEXTURE | _NEW_BUFFERS | _NEW_FRAG_CLAMP;
 637
 638    case STATE_FOG_COLOR:
 639       return _NEW_FOG | _NEW_BUFFERS | _NEW_FRAG_CLAMP;
 640    case STATE_FOG_PARAMS:
 641       return _NEW_FOG;
 642
 643    case STATE_CLIPPLANE:
 644       return _NEW_TRANSFORM;
 645
 646    case STATE_POINT_SIZE:
 647    case STATE_POINT_ATTENUATION:
 648       return _NEW_POINT;
 649
 650    case STATE_MODELVIEW_MATRIX:
 651       return _NEW_MODELVIEW;
 652    case STATE_PROJECTION_MATRIX:
 653       return _NEW_PROJECTION;
 654    case STATE_MVP_MATRIX:
 655       return _NEW_MODELVIEW | _NEW_PROJECTION;
 656    case STATE_TEXTURE_MATRIX:
 657       return _NEW_TEXTURE_MATRIX;
 658    case STATE_PROGRAM_MATRIX:
 659       return _NEW_TRACK_MATRIX;
 660
 661    case STATE_NUM_SAMPLES:
 662       return _NEW_BUFFERS;
 663
 664    case STATE_DEPTH_RANGE:
 665       return _NEW_VIEWPORT;
 666
 667    case STATE_FRAGMENT_PROGRAM:
 668    case STATE_VERTEX_PROGRAM:
 669       return _NEW_PROGRAM;
 670
 671    case STATE_NORMAL_SCALE:
 672       return _NEW_MODELVIEW;
 673
 674    case STATE_INTERNAL:
 675       switch (state[1]) {
 676       case STATE_CURRENT_ATTRIB:
 677          return _NEW_CURRENT_ATTRIB;
 678       case STATE_CURRENT_ATTRIB_MAYBE_VP_CLAMPED:
 679          return _NEW_CURRENT_ATTRIB | _NEW_LIGHT | _NEW_BUFFERS;
 680
 681       case STATE_NORMAL_SCALE:
 682          return _NEW_MODELVIEW;
 683
 684       case STATE_TEXRECT_SCALE:
 685          return _NEW_TEXTURE;
 686       case STATE_FOG_PARAMS_OPTIMIZED:
 687          return _NEW_FOG;
 688       case STATE_POINT_SIZE_CLAMPED:
 689          return _NEW_POINT | _NEW_MULTISAMPLE;
 690       case STATE_LIGHT_SPOT_DIR_NORMALIZED:
 691       case STATE_LIGHT_POSITION:
 692       case STATE_LIGHT_POSITION_NORMALIZED:
 693       case STATE_LIGHT_HALF_VECTOR:
 694          return _NEW_LIGHT;
 695
 696       case STATE_PT_SCALE:
 697       case STATE_PT_BIAS:
 698          return _NEW_PIXEL;
 699
 700       case STATE_FB_SIZE:
 701       case STATE_FB_WPOS_Y_TRANSFORM:
 702          return _NEW_BUFFERS;
 703
 704       default:
 705          /* unknown state indexes are silently ignored and
 706          *  no flag set, since it is handled by the driver.
 707          */
 708          return 0;
 709       }
 710
 711    default:
 712       _mesa_problem(NULL, "unexpected state[0] in make_state_flags()");
 713       return 0;
 714    }
 715 }
 716
 717
 718 static void
 719 append(char *dst, const char *src)
 720 {
 721    while (*dst)
 722       dst++;
 723    while (*src)
 724      *dst++ = *src++;
 725    *dst = 0;
 726 }
 727
 728
 729 /**
 730  * Convert token 'k' to a string, append it onto 'dst' string.
 731  */
 732 static void
 733 append_token(char *dst, gl_state_index k)
 734 {
 735    switch (k) {
 736    case STATE_MATERIAL:
 737       append(dst, "material");
 738       break;
 739    case STATE_LIGHT:
 740       append(dst, "light");
 741       break;
 742    case STATE_LIGHTMODEL_AMBIENT:
 743       append(dst, "lightmodel.ambient");
 744       break;
 745    case STATE_LIGHTMODEL_SCENECOLOR:
 746       break;
 747    case STATE_LIGHTPROD:
 748       append(dst, "lightprod");
 749       break;
 750    case STATE_TEXGEN:
 751       append(dst, "texgen");
 752       break;
 753    case STATE_FOG_COLOR:
 754       append(dst, "fog.color");
 755       break;
 756    case STATE_FOG_PARAMS:
 757       append(dst, "fog.params");
 758       break;
 759    case STATE_CLIPPLANE:
 760       append(dst, "clip");
 761       break;
 762    case STATE_POINT_SIZE:
 763       append(dst, "point.size");
 764       break;
 765    case STATE_POINT_ATTENUATION:
 766       append(dst, "point.attenuation");
 767       break;
 768    case STATE_MODELVIEW_MATRIX:
 769       append(dst, "matrix.modelview");
 770       break;
 771    case STATE_PROJECTION_MATRIX:
 772       append(dst, "matrix.projection");
 773       break;
 774    case STATE_MVP_MATRIX:
 775       append(dst, "matrix.mvp");
 776       break;
 777    case STATE_TEXTURE_MATRIX:
 778       append(dst, "matrix.texture");
 779       break;
 780    case STATE_PROGRAM_MATRIX:
 781       append(dst, "matrix.program");
 782       break;
 783    case STATE_MATRIX_INVERSE:
 784       append(dst, ".inverse");
 785       break;
 786    case STATE_MATRIX_TRANSPOSE:
 787       append(dst, ".transpose");
 788       break;
 789    case STATE_MATRIX_INVTRANS:
 790       append(dst, ".invtrans");
 791       break;
 792    case STATE_AMBIENT:
 793       append(dst, ".ambient");
 794       break;
 795    case STATE_DIFFUSE:
 796       append(dst, ".diffuse");
 797       break;
 798    case STATE_SPECULAR:
 799       append(dst, ".specular");
 800       break;
 801    case STATE_EMISSION:
 802       append(dst, ".emission");
 803       break;
 804    case STATE_SHININESS:
 805       append(dst, "lshininess");
 806       break;
 807    case STATE_HALF_VECTOR:
 808       append(dst, ".half");
 809       break;
 810    case STATE_POSITION:
 811       append(dst, ".position");
 812       break;
 813    case STATE_ATTENUATION:
 814       append(dst, ".attenuation");
 815       break;
 816    case STATE_SPOT_DIRECTION:
 817       append(dst, ".spot.direction");
 818       break;
 819    case STATE_SPOT_CUTOFF:
 820       append(dst, ".spot.cutoff");
 821       break;
 822    case STATE_TEXGEN_EYE_S:
 823       append(dst, ".eye.s");
 824       break;
 825    case STATE_TEXGEN_EYE_T:
 826       append(dst, ".eye.t");
 827       break;
 828    case STATE_TEXGEN_EYE_R:
 829       append(dst, ".eye.r");
 830       break;
 831    case STATE_TEXGEN_EYE_Q:
 832       append(dst, ".eye.q");
 833       break;
 834    case STATE_TEXGEN_OBJECT_S:
 835       append(dst, ".object.s");
 836       break;
 837    case STATE_TEXGEN_OBJECT_T:
 838       append(dst, ".object.t");
 839       break;
 840    case STATE_TEXGEN_OBJECT_R:
 841       append(dst, ".object.r");
 842       break;
 843    case STATE_TEXGEN_OBJECT_Q:
 844       append(dst, ".object.q");
 845       break;
 846    case STATE_TEXENV_COLOR:
 847       append(dst, "texenv");
 848       break;
 849    case STATE_NUM_SAMPLES:
 850       append(dst, "numsamples");
 851       break;
 852    case STATE_DEPTH_RANGE:
 853       append(dst, "depth.range");
 854       break;
 855    case STATE_VERTEX_PROGRAM:
 856    case STATE_FRAGMENT_PROGRAM:
 857       break;
 858    case STATE_ENV:
 859       append(dst, "env");
 860       break;
 861    case STATE_LOCAL:
 862       append(dst, "local");
 863       break;
 864    /* BEGIN internal state vars */
 865    case STATE_INTERNAL:
 866       append(dst, ".internal.");
 867       break;
 868    case STATE_CURRENT_ATTRIB:
 869       append(dst, "current");
 870       break;
 871    case STATE_CURRENT_ATTRIB_MAYBE_VP_CLAMPED:
 872       append(dst, "currentAttribMaybeVPClamped");
 873       break;
 874    case STATE_NORMAL_SCALE:
 875       append(dst, "normalScale");
 876       break;
 877    case STATE_TEXRECT_SCALE:
 878       append(dst, "texrectScale");
 879       break;
 880    case STATE_FOG_PARAMS_OPTIMIZED:
 881       append(dst, "fogParamsOptimized");
 882       break;
 883    case STATE_POINT_SIZE_CLAMPED:
 884       append(dst, "pointSizeClamped");
 885       break;
 886    case STATE_LIGHT_SPOT_DIR_NORMALIZED:
 887       append(dst, "lightSpotDirNormalized");
 888       break;
 889    case STATE_LIGHT_POSITION:
 890       append(dst, "lightPosition");
 891       break;
 892    case STATE_LIGHT_POSITION_NORMALIZED:
 893       append(dst, "light.position.normalized");
 894       break;
 895    case STATE_LIGHT_HALF_VECTOR:
 896       append(dst, "lightHalfVector");
 897       break;
 898    case STATE_PT_SCALE:
 899       append(dst, "PTscale");
 900       break;
 901    case STATE_PT_BIAS:
 902       append(dst, "PTbias");
 903       break;
 904    case STATE_FB_SIZE:
 905       append(dst, "FbSize");
 906       break;
 907    case STATE_FB_WPOS_Y_TRANSFORM:
 908       append(dst, "FbWposYTransform");
 909       break;
 910    default:
 911       /* probably STATE_INTERNAL_DRIVER+i (driver private state) */
 912       append(dst, "driverState");
 913    }
 914 }
 915
 916 static void
 917 append_face(char *dst, GLint face)
 918 {
 919    if (face == 0)
 920       append(dst, "front.");
 921    else
 922       append(dst, "back.");
 923 }
 924
 925 static void
 926 append_index(char *dst, GLint index)
 927 {
 928    char s[20];
 929    sprintf(s, "[%d]", index);
 930    append(dst, s);
 931 }
 932
 933 /**
 934  * Make a string from the given state vector.
 935  * For example, return "state.matrix.texture[2].inverse".
 936  * Use free() to deallocate the string.
 937  */
 938 char *
 939 _mesa_program_state_string(const gl_state_index state[STATE_LENGTH])
 940 {
 941    char str[1000] = "";
 942    char tmp[30];
 943
 944    append(str, "state.");
 945    append_token(str, state[0]);
 946
 947    switch (state[0]) {
 948    case STATE_MATERIAL:
 949       append_face(str, state[1]);
 950       append_token(str, state[2]);
 951       break;
 952    case STATE_LIGHT:
 953       append_index(str, state[1]); /* light number [i]. */
 954       append_token(str, state[2]); /* coefficients */
 955       break;
 956    case STATE_LIGHTMODEL_AMBIENT:
 957       append(str, "lightmodel.ambient");
 958       break;
 959    case STATE_LIGHTMODEL_SCENECOLOR:
 960       if (state[1] == 0) {
 961          append(str, "lightmodel.front.scenecolor");
 962       }
 963       else {
 964          append(str, "lightmodel.back.scenecolor");
 965       }
 966       break;
 967    case STATE_LIGHTPROD:
 968       append_index(str, state[1]); /* light number [i]. */
 969       append_face(str, state[2]);
 970       append_token(str, state[3]);
 971       break;
 972    case STATE_TEXGEN:
 973       append_index(str, state[1]); /* tex unit [i] */
 974       append_token(str, state[2]); /* plane coef */
 975       break;
 976    case STATE_TEXENV_COLOR:
 977       append_index(str, state[1]); /* tex unit [i] */
 978       append(str, "color");
 979       break;
 980    case STATE_CLIPPLANE:
 981       append_index(str, state[1]); /* plane [i] */
 982       append(str, ".plane");
 983       break;
 984    case STATE_MODELVIEW_MATRIX:
 985    case STATE_PROJECTION_MATRIX:
 986    case STATE_MVP_MATRIX:
 987    case STATE_TEXTURE_MATRIX:
 988    case STATE_PROGRAM_MATRIX:
 989       {
 990          /* state[0] = modelview, projection, texture, etc. */
 991          /* state[1] = which texture matrix or program matrix */
 992          /* state[2] = first row to fetch */
 993          /* state[3] = last row to fetch */
 994          /* state[4] = transpose, inverse or invtrans */
 995          const gl_state_index mat = state[0];
 996          const GLuint index = (GLuint) state[1];
 997          const GLuint firstRow = (GLuint) state[2];
 998          const GLuint lastRow = (GLuint) state[3];
 999          const gl_state_index modifier = state[4];
1000          if (index ||
1001              mat == STATE_TEXTURE_MATRIX ||
1002              mat == STATE_PROGRAM_MATRIX)
1003             append_index(str, index);
1004          if (modifier)
1005             append_token(str, modifier);
1006          if (firstRow == lastRow)
1007             sprintf(tmp, ".row[%d]", firstRow);
1008          else
1009             sprintf(tmp, ".row[%d..%d]", firstRow, lastRow);
1010          append(str, tmp);
1011       }
1012       break;
1013    case STATE_POINT_SIZE:
1014       break;
1015    case STATE_POINT_ATTENUATION:
1016       break;
1017    case STATE_FOG_PARAMS:
1018       break;
1019    case STATE_FOG_COLOR:
1020       break;
1021    case STATE_NUM_SAMPLES:
1022       break;
1023    case STATE_DEPTH_RANGE:
1024       break;
1025    case STATE_FRAGMENT_PROGRAM:
1026    case STATE_VERTEX_PROGRAM:
1027       /* state[1] = {STATE_ENV, STATE_LOCAL} */
1028       /* state[2] = parameter index          */
1029       append_token(str, state[1]);
1030       append_index(str, state[2]);
1031       break;
1032    case STATE_NORMAL_SCALE:
1033       break;
1034    case STATE_INTERNAL:
1035       append_token(str, state[1]);
1036       if (state[1] == STATE_CURRENT_ATTRIB)
1037          append_index(str, state[2]);
1038        break;
1039    default:
1040       _mesa_problem(NULL, "Invalid state in _mesa_program_state_string");
1041       break;
1042    }
1043
1044    return _mesa_strdup(str);
1045 }
1046
1047
1048 /**
1049  * Loop over all the parameters in a parameter list.  If the parameter
1050  * is a GL state reference, look up the current value of that state
1051  * variable and put it into the parameter's Value[4] array.
1052  * Other parameter types never change or are explicitly set by the user
1053  * with glUniform() or glProgramParameter(), etc.
1054  * This would be called at glBegin time.
1055  */
1056 void
1057 _mesa_load_state_parameters(struct gl_context *ctx,
1058                             struct gl_program_parameter_list *paramList)
1059 {
1060    GLuint i;
1061
1062    if (!paramList)
1063       return;
1064
1065    for (i = 0; i < paramList->NumParameters; i++) {
1066       if (paramList->Parameters[i].Type == PROGRAM_STATE_VAR) {
1067          _mesa_fetch_state(ctx,
1068                            paramList->Parameters[i].StateIndexes,
1069                            &paramList->ParameterValues[i][0].f);
1070       }
1071    }
1072 }