src/mesa/main/light.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.5
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26
  27 #include "glheader.h"
  28 #include "imports.h"
  29 #include "context.h"
  30 #include "enums.h"
  31 #include "light.h"
  32 #include "macros.h"
  33 #include "simple_list.h"
  34 #include "mtypes.h"
  35 #include "math/m_matrix.h"
  36
  37
  38 void GLAPIENTRY
  39 _mesa_ShadeModel( GLenum mode )
  40 {
  41    GET_CURRENT_CONTEXT(ctx);
  42    ASSERT_OUTSIDE_BEGIN_END(ctx);
  43
  44    if (MESA_VERBOSE & VERBOSE_API)
  45       _mesa_debug(ctx, "glShadeModel %s\n", _mesa_lookup_enum_by_nr(mode));
  46
  47    if (mode != GL_FLAT && mode != GL_SMOOTH) {
  48       _mesa_error(ctx, GL_INVALID_ENUM, "glShadeModel");
  49       return;
  50    }
  51
  52    if (ctx->Light.ShadeModel == mode)
  53       return;
  54
  55    FLUSH_VERTICES(ctx, _NEW_LIGHT);
  56    ctx->Light.ShadeModel = mode;
  57
  58    if (ctx->Driver.ShadeModel)
  59       ctx->Driver.ShadeModel( ctx, mode );
  60 }
  61
  62
  63 /**
  64  * Set the provoking vertex (the vertex which specifies the prim's
  65  * color when flat shading) to either the first or last vertex of the
  66  * triangle or line.
  67  */
  68 void GLAPIENTRY
  69 _mesa_ProvokingVertexEXT(GLenum mode)
  70 {
  71    GET_CURRENT_CONTEXT(ctx);
  72    ASSERT_OUTSIDE_BEGIN_END(ctx);
  73
  74    if (MESA_VERBOSE&VERBOSE_API)
  75       _mesa_debug(ctx, "glProvokingVertexEXT 0x%x\n", mode);
  76
  77    switch (mode) {
  78    case GL_FIRST_VERTEX_CONVENTION_EXT:
  79    case GL_LAST_VERTEX_CONVENTION_EXT:
  80       break;
  81    default:
  82       _mesa_error(ctx, GL_INVALID_ENUM, "glProvokingVertexEXT(0x%x)", mode);
  83       return;
  84    }
  85
  86    if (ctx->Light.ProvokingVertex == mode)
  87       return;
  88
  89    FLUSH_VERTICES(ctx, _NEW_LIGHT);
  90    ctx->Light.ProvokingVertex = mode;
  91 }
  92
  93
  94 /**
  95  * Helper function called by _mesa_Lightfv and _mesa_PopAttrib to set
  96  * per-light state.
  97  * For GL_POSITION and GL_SPOT_DIRECTION the params position/direction
  98  * will have already been transformed by the modelview matrix!
  99  * Also, all error checking should have already been done.
 100  */
 101 void
 102 _mesa_light(struct gl_context *ctx, GLuint lnum, GLenum pname, const GLfloat *params)
 103 {
 104    struct gl_light *light;
 105
 106    ASSERT(lnum < MAX_LIGHTS);
 107    light = &ctx->Light.Light[lnum];
 108
 109    switch (pname) {
 110    case GL_AMBIENT:
 111       if (TEST_EQ_4V(light->Ambient, params))
 112          return;
 113       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 114       COPY_4V( light->Ambient, params );
 115       break;
 116    case GL_DIFFUSE:
 117       if (TEST_EQ_4V(light->Diffuse, params))
 118          return;
 119       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 120       COPY_4V( light->Diffuse, params );
 121       break;
 122    case GL_SPECULAR:
 123       if (TEST_EQ_4V(light->Specular, params))
 124          return;
 125       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 126       COPY_4V( light->Specular, params );
 127       break;
 128    case GL_POSITION:
 129       /* NOTE: position has already been transformed by ModelView! */
 130       if (TEST_EQ_4V(light->EyePosition, params))
 131          return;
 132       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 133       COPY_4V(light->EyePosition, params);
 134       if (light->EyePosition[3] != 0.0F)
 135          light->_Flags |= LIGHT_POSITIONAL;
 136       else
 137          light->_Flags &= ~LIGHT_POSITIONAL;
 138       break;
 139    case GL_SPOT_DIRECTION:
 140       /* NOTE: Direction already transformed by inverse ModelView! */
 141       if (TEST_EQ_3V(light->SpotDirection, params))
 142          return;
 143       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 144       COPY_3V(light->SpotDirection, params);
 145       break;
 146    case GL_SPOT_EXPONENT:
 147       ASSERT(params[0] >= 0.0);
 148       ASSERT(params[0] <= ctx->Const.MaxSpotExponent);
 149       if (light->SpotExponent == params[0])
 150          return;
 151       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 152       light->SpotExponent = params[0];
 153       break;
 154    case GL_SPOT_CUTOFF:
 155       ASSERT(params[0] == 180.0 || (params[0] >= 0.0 && params[0] <= 90.0));
 156       if (light->SpotCutoff == params[0])
 157          return;
 158       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 159       light->SpotCutoff = params[0];
 160       light->_CosCutoff = (GLfloat) (cos(light->SpotCutoff * DEG2RAD));
 161       if (light->_CosCutoff < 0)
 162          light->_CosCutoff = 0;
 163       if (light->SpotCutoff != 180.0F)
 164          light->_Flags |= LIGHT_SPOT;
 165       else
 166          light->_Flags &= ~LIGHT_SPOT;
 167       break;
 168    case GL_CONSTANT_ATTENUATION:
 169       ASSERT(params[0] >= 0.0);
 170       if (light->ConstantAttenuation == params[0])
 171          return;
 172       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 173       light->ConstantAttenuation = params[0];
 174       break;
 175    case GL_LINEAR_ATTENUATION:
 176       ASSERT(params[0] >= 0.0);
 177       if (light->LinearAttenuation == params[0])
 178          return;
 179       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 180       light->LinearAttenuation = params[0];
 181       break;
 182    case GL_QUADRATIC_ATTENUATION:
 183       ASSERT(params[0] >= 0.0);
 184       if (light->QuadraticAttenuation == params[0])
 185          return;
 186       FLUSH_VERTICES(ctx, _NEW_LIGHT);
 187       light->QuadraticAttenuation = params[0];
 188       break;
 189    default:
 190       _mesa_problem(ctx, "Unexpected pname in _mesa_light()");
 191       return;
 192    }
 193
 194    if (ctx->Driver.Lightfv)
 195       ctx->Driver.Lightfv( ctx, GL_LIGHT0 + lnum, pname, params );
 196 }
 197
 198
 199 void GLAPIENTRY
 200 _mesa_Lightf( GLenum light, GLenum pname, GLfloat param )
 201 {
 202    GLfloat fparam[4];
 203    fparam[0] = param;
 204    fparam[1] = fparam[2] = fparam[3] = 0.0F;
 205    _mesa_Lightfv( light, pname, fparam );
 206 }
 207
 208
 209 void GLAPIENTRY
 210 _mesa_Lightfv( GLenum light, GLenum pname, const GLfloat *params )
 211 {
 212    GET_CURRENT_CONTEXT(ctx);
 213    GLint i = (GLint) (light - GL_LIGHT0);
 214    GLfloat temp[4];
 215    ASSERT_OUTSIDE_BEGIN_END(ctx);
 216
 217    if (i < 0 || i >= (GLint) ctx->Const.MaxLights) {
 218       _mesa_error( ctx, GL_INVALID_ENUM, "glLight(light=0x%x)", light );
 219       return;
 220    }
 221
 222    /* do particular error checks, transformations */
 223    switch (pname) {
 224    case GL_AMBIENT:
 225    case GL_DIFFUSE:
 226    case GL_SPECULAR:
 227       /* nothing */
 228       break;
 229    case GL_POSITION:
 230       /* transform position by ModelView matrix */
 231       TRANSFORM_POINT(temp, ctx->ModelviewMatrixStack.Top->m, params);
 232       params = temp;
 233       break;
 234    case GL_SPOT_DIRECTION:
 235       /* transform direction by inverse modelview */
 236       if (_math_matrix_is_dirty(ctx->ModelviewMatrixStack.Top)) {
 237          _math_matrix_analyse(ctx->ModelviewMatrixStack.Top);
 238       }
 239       TRANSFORM_DIRECTION(temp, params, ctx->ModelviewMatrixStack.Top->m);
 240       params = temp;
 241       break;
 242    case GL_SPOT_EXPONENT:
 243       if (params[0] < 0.0 || params[0] > ctx->Const.MaxSpotExponent) {
 244          _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
 245          return;
 246       }
 247       break;
 248    case GL_SPOT_CUTOFF:
 249       if ((params[0] < 0.0 || params[0] > 90.0) && params[0] != 180.0) {
 250          _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
 251          return;
 252       }
 253       break;
 254    case GL_CONSTANT_ATTENUATION:
 255       if (params[0] < 0.0) {
 256          _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
 257          return;
 258       }
 259       break;
 260    case GL_LINEAR_ATTENUATION:
 261       if (params[0] < 0.0) {
 262          _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
 263          return;
 264       }
 265       break;
 266    case GL_QUADRATIC_ATTENUATION:
 267       if (params[0] < 0.0) {
 268          _mesa_error(ctx, GL_INVALID_VALUE, "glLight");
 269          return;
 270       }
 271       break;
 272    default:
 273       _mesa_error(ctx, GL_INVALID_ENUM, "glLight(pname=0x%x)", pname);
 274       return;
 275    }
 276
 277    _mesa_light(ctx, i, pname, params);
 278 }
 279
 280
 281 void GLAPIENTRY
 282 _mesa_Lighti( GLenum light, GLenum pname, GLint param )
 283 {
 284    GLint iparam[4];
 285    iparam[0] = param;
 286    iparam[1] = iparam[2] = iparam[3] = 0;
 287    _mesa_Lightiv( light, pname, iparam );
 288 }
 289
 290
 291 void GLAPIENTRY
 292 _mesa_Lightiv( GLenum light, GLenum pname, const GLint *params )
 293 {
 294    GLfloat fparam[4];
 295
 296    switch (pname) {
 297       case GL_AMBIENT:
 298       case GL_DIFFUSE:
 299       case GL_SPECULAR:
 300          fparam[0] = INT_TO_FLOAT( params[0] );
 301          fparam[1] = INT_TO_FLOAT( params[1] );
 302          fparam[2] = INT_TO_FLOAT( params[2] );
 303          fparam[3] = INT_TO_FLOAT( params[3] );
 304          break;
 305       case GL_POSITION:
 306          fparam[0] = (GLfloat) params[0];
 307          fparam[1] = (GLfloat) params[1];
 308          fparam[2] = (GLfloat) params[2];
 309          fparam[3] = (GLfloat) params[3];
 310          break;
 311       case GL_SPOT_DIRECTION:
 312          fparam[0] = (GLfloat) params[0];
 313          fparam[1] = (GLfloat) params[1];
 314          fparam[2] = (GLfloat) params[2];
 315          break;
 316       case GL_SPOT_EXPONENT:
 317       case GL_SPOT_CUTOFF:
 318       case GL_CONSTANT_ATTENUATION:
 319       case GL_LINEAR_ATTENUATION:
 320       case GL_QUADRATIC_ATTENUATION:
 321          fparam[0] = (GLfloat) params[0];
 322          break;
 323       default:
 324          /* error will be caught later in gl_Lightfv */
 325          ;
 326    }
 327
 328    _mesa_Lightfv( light, pname, fparam );
 329 }
 330
 331
 332
 333 void GLAPIENTRY
 334 _mesa_GetLightfv( GLenum light, GLenum pname, GLfloat *params )
 335 {
 336    GET_CURRENT_CONTEXT(ctx);
 337    GLint l = (GLint) (light - GL_LIGHT0);
 338    ASSERT_OUTSIDE_BEGIN_END(ctx);
 339
 340    if (l < 0 || l >= (GLint) ctx->Const.MaxLights) {
 341       _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
 342       return;
 343    }
 344
 345    switch (pname) {
 346       case GL_AMBIENT:
 347          COPY_4V( params, ctx->Light.Light[l].Ambient );
 348          break;
 349       case GL_DIFFUSE:
 350          COPY_4V( params, ctx->Light.Light[l].Diffuse );
 351          break;
 352       case GL_SPECULAR:
 353          COPY_4V( params, ctx->Light.Light[l].Specular );
 354          break;
 355       case GL_POSITION:
 356          COPY_4V( params, ctx->Light.Light[l].EyePosition );
 357          break;
 358       case GL_SPOT_DIRECTION:
 359          COPY_3V( params, ctx->Light.Light[l].SpotDirection );
 360          break;
 361       case GL_SPOT_EXPONENT:
 362          params[0] = ctx->Light.Light[l].SpotExponent;
 363          break;
 364       case GL_SPOT_CUTOFF:
 365          params[0] = ctx->Light.Light[l].SpotCutoff;
 366          break;
 367       case GL_CONSTANT_ATTENUATION:
 368          params[0] = ctx->Light.Light[l].ConstantAttenuation;
 369          break;
 370       case GL_LINEAR_ATTENUATION:
 371          params[0] = ctx->Light.Light[l].LinearAttenuation;
 372          break;
 373       case GL_QUADRATIC_ATTENUATION:
 374          params[0] = ctx->Light.Light[l].QuadraticAttenuation;
 375          break;
 376       default:
 377          _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightfv" );
 378          break;
 379    }
 380 }
 381
 382
 383 void GLAPIENTRY
 384 _mesa_GetLightiv( GLenum light, GLenum pname, GLint *params )
 385 {
 386    GET_CURRENT_CONTEXT(ctx);
 387    GLint l = (GLint) (light - GL_LIGHT0);
 388    ASSERT_OUTSIDE_BEGIN_END(ctx);
 389
 390    if (l < 0 || l >= (GLint) ctx->Const.MaxLights) {
 391       _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
 392       return;
 393    }
 394
 395    switch (pname) {
 396       case GL_AMBIENT:
 397          params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[0]);
 398          params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[1]);
 399          params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[2]);
 400          params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Ambient[3]);
 401          break;
 402       case GL_DIFFUSE:
 403          params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[0]);
 404          params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[1]);
 405          params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[2]);
 406          params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Diffuse[3]);
 407          break;
 408       case GL_SPECULAR:
 409          params[0] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[0]);
 410          params[1] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[1]);
 411          params[2] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[2]);
 412          params[3] = FLOAT_TO_INT(ctx->Light.Light[l].Specular[3]);
 413          break;
 414       case GL_POSITION:
 415          params[0] = (GLint) ctx->Light.Light[l].EyePosition[0];
 416          params[1] = (GLint) ctx->Light.Light[l].EyePosition[1];
 417          params[2] = (GLint) ctx->Light.Light[l].EyePosition[2];
 418          params[3] = (GLint) ctx->Light.Light[l].EyePosition[3];
 419          break;
 420       case GL_SPOT_DIRECTION:
 421          params[0] = (GLint) ctx->Light.Light[l].SpotDirection[0];
 422          params[1] = (GLint) ctx->Light.Light[l].SpotDirection[1];
 423          params[2] = (GLint) ctx->Light.Light[l].SpotDirection[2];
 424          break;
 425       case GL_SPOT_EXPONENT:
 426          params[0] = (GLint) ctx->Light.Light[l].SpotExponent;
 427          break;
 428       case GL_SPOT_CUTOFF:
 429          params[0] = (GLint) ctx->Light.Light[l].SpotCutoff;
 430          break;
 431       case GL_CONSTANT_ATTENUATION:
 432          params[0] = (GLint) ctx->Light.Light[l].ConstantAttenuation;
 433          break;
 434       case GL_LINEAR_ATTENUATION:
 435          params[0] = (GLint) ctx->Light.Light[l].LinearAttenuation;
 436          break;
 437       case GL_QUADRATIC_ATTENUATION:
 438          params[0] = (GLint) ctx->Light.Light[l].QuadraticAttenuation;
 439          break;
 440       default:
 441          _mesa_error( ctx, GL_INVALID_ENUM, "glGetLightiv" );
 442          break;
 443    }
 444 }
 445
 446
 447
 448 /**********************************************************************/
 449 /***                        Light Model                             ***/
 450 /**********************************************************************/
 451
 452
 453 void GLAPIENTRY
 454 _mesa_LightModelfv( GLenum pname, const GLfloat *params )
 455 {
 456    GLenum newenum;
 457    GLboolean newbool;
 458    GET_CURRENT_CONTEXT(ctx);
 459    ASSERT_OUTSIDE_BEGIN_END(ctx);
 460
 461    switch (pname) {
 462       case GL_LIGHT_MODEL_AMBIENT:
 463          if (TEST_EQ_4V( ctx->Light.Model.Ambient, params ))
 464             return;
 465          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 466          COPY_4V( ctx->Light.Model.Ambient, params );
 467          break;
 468       case GL_LIGHT_MODEL_LOCAL_VIEWER:
 469          newbool = (params[0]!=0.0);
 470          if (ctx->Light.Model.LocalViewer == newbool)
 471             return;
 472          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 473          ctx->Light.Model.LocalViewer = newbool;
 474          break;
 475       case GL_LIGHT_MODEL_TWO_SIDE:
 476          newbool = (params[0]!=0.0);
 477          if (ctx->Light.Model.TwoSide == newbool)
 478             return;
 479          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 480          ctx->Light.Model.TwoSide = newbool;
 481          if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 482             ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 483          else
 484             ctx->_TriangleCaps &= ~DD_TRI_LIGHT_TWOSIDE;
 485          break;
 486       case GL_LIGHT_MODEL_COLOR_CONTROL:
 487          if (params[0] == (GLfloat) GL_SINGLE_COLOR)
 488             newenum = GL_SINGLE_COLOR;
 489          else if (params[0] == (GLfloat) GL_SEPARATE_SPECULAR_COLOR)
 490             newenum = GL_SEPARATE_SPECULAR_COLOR;
 491          else {
 492             _mesa_error( ctx, GL_INVALID_ENUM, "glLightModel(param=0x0%x)",
 493                          (GLint) params[0] );
 494             return;
 495          }
 496          if (ctx->Light.Model.ColorControl == newenum)
 497             return;
 498          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 499          ctx->Light.Model.ColorControl = newenum;
 500          break;
 501       default:
 502          _mesa_error( ctx, GL_INVALID_ENUM, "glLightModel(pname=0x%x)", pname );
 503          break;
 504    }
 505
 506    if (ctx->Driver.LightModelfv)
 507       ctx->Driver.LightModelfv( ctx, pname, params );
 508 }
 509
 510
 511 void GLAPIENTRY
 512 _mesa_LightModeliv( GLenum pname, const GLint *params )
 513 {
 514    GLfloat fparam[4];
 515
 516    switch (pname) {
 517       case GL_LIGHT_MODEL_AMBIENT:
 518          fparam[0] = INT_TO_FLOAT( params[0] );
 519          fparam[1] = INT_TO_FLOAT( params[1] );
 520          fparam[2] = INT_TO_FLOAT( params[2] );
 521          fparam[3] = INT_TO_FLOAT( params[3] );
 522          break;
 523       case GL_LIGHT_MODEL_LOCAL_VIEWER:
 524       case GL_LIGHT_MODEL_TWO_SIDE:
 525       case GL_LIGHT_MODEL_COLOR_CONTROL:
 526          fparam[0] = (GLfloat) params[0];
 527          break;
 528       default:
 529          /* Error will be caught later in gl_LightModelfv */
 530          ASSIGN_4V(fparam, 0.0F, 0.0F, 0.0F, 0.0F);
 531    }
 532    _mesa_LightModelfv( pname, fparam );
 533 }
 534
 535
 536 void GLAPIENTRY
 537 _mesa_LightModeli( GLenum pname, GLint param )
 538 {
 539    GLint iparam[4];
 540    iparam[0] = param;
 541    iparam[1] = iparam[2] = iparam[3] = 0;
 542    _mesa_LightModeliv( pname, iparam );
 543 }
 544
 545
 546 void GLAPIENTRY
 547 _mesa_LightModelf( GLenum pname, GLfloat param )
 548 {
 549    GLfloat fparam[4];
 550    fparam[0] = param;
 551    fparam[1] = fparam[2] = fparam[3] = 0.0F;
 552    _mesa_LightModelfv( pname, fparam );
 553 }
 554
 555
 556
 557 /********** MATERIAL **********/
 558
 559
 560 /*
 561  * Given a face and pname value (ala glColorMaterial), compute a bitmask
 562  * of the targeted material values.
 563  */
 564 GLuint
 565 _mesa_material_bitmask( struct gl_context *ctx, GLenum face, GLenum pname,
 566                         GLuint legal, const char *where )
 567 {
 568    GLuint bitmask = 0;
 569
 570    /* Make a bitmask indicating what material attribute(s) we're updating */
 571    switch (pname) {
 572       case GL_EMISSION:
 573          bitmask |= MAT_BIT_FRONT_EMISSION | MAT_BIT_BACK_EMISSION;
 574          break;
 575       case GL_AMBIENT:
 576          bitmask |= MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT;
 577          break;
 578       case GL_DIFFUSE:
 579          bitmask |= MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE;
 580          break;
 581       case GL_SPECULAR:
 582          bitmask |= MAT_BIT_FRONT_SPECULAR | MAT_BIT_BACK_SPECULAR;
 583          break;
 584       case GL_SHININESS:
 585          bitmask |= MAT_BIT_FRONT_SHININESS | MAT_BIT_BACK_SHININESS;
 586          break;
 587       case GL_AMBIENT_AND_DIFFUSE:
 588          bitmask |= MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT;
 589          bitmask |= MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE;
 590          break;
 591       case GL_COLOR_INDEXES:
 592          bitmask |= MAT_BIT_FRONT_INDEXES  | MAT_BIT_BACK_INDEXES;
 593          break;
 594       default:
 595          _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
 596          return 0;
 597    }
 598
 599    if (face==GL_FRONT) {
 600       bitmask &= FRONT_MATERIAL_BITS;
 601    }
 602    else if (face==GL_BACK) {
 603       bitmask &= BACK_MATERIAL_BITS;
 604    }
 605    else if (face != GL_FRONT_AND_BACK) {
 606       _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
 607       return 0;
 608    }
 609
 610    if (bitmask & ~legal) {
 611       _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
 612       return 0;
 613    }
 614
 615    return bitmask;
 616 }
 617
 618
 619
 620 /* Update derived values following a change in ctx->Light.Material
 621  */
 622 void
 623 _mesa_update_material( struct gl_context *ctx, GLuint bitmask )
 624 {
 625    struct gl_light *light, *list = &ctx->Light.EnabledList;
 626    GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
 627
 628    if (MESA_VERBOSE & VERBOSE_MATERIAL)
 629       _mesa_debug(ctx, "_mesa_update_material, mask 0x%x\n", bitmask);
 630
 631    if (!bitmask)
 632       return;
 633
 634    /* update material ambience */
 635    if (bitmask & MAT_BIT_FRONT_AMBIENT) {
 636       foreach (light, list) {
 637          SCALE_3V( light->_MatAmbient[0], light->Ambient,
 638                    mat[MAT_ATTRIB_FRONT_AMBIENT]);
 639       }
 640    }
 641
 642    if (bitmask & MAT_BIT_BACK_AMBIENT) {
 643       foreach (light, list) {
 644          SCALE_3V( light->_MatAmbient[1], light->Ambient,
 645                    mat[MAT_ATTRIB_BACK_AMBIENT]);
 646       }
 647    }
 648
 649    /* update BaseColor = emission + scene's ambience * material's ambience */
 650    if (bitmask & (MAT_BIT_FRONT_EMISSION | MAT_BIT_FRONT_AMBIENT)) {
 651       COPY_3V( ctx->Light._BaseColor[0], mat[MAT_ATTRIB_FRONT_EMISSION] );
 652       ACC_SCALE_3V( ctx->Light._BaseColor[0], mat[MAT_ATTRIB_FRONT_AMBIENT],
 653                     ctx->Light.Model.Ambient );
 654    }
 655
 656    if (bitmask & (MAT_BIT_BACK_EMISSION | MAT_BIT_BACK_AMBIENT)) {
 657       COPY_3V( ctx->Light._BaseColor[1], mat[MAT_ATTRIB_BACK_EMISSION] );
 658       ACC_SCALE_3V( ctx->Light._BaseColor[1], mat[MAT_ATTRIB_BACK_AMBIENT],
 659                     ctx->Light.Model.Ambient );
 660    }
 661
 662    /* update material diffuse values */
 663    if (bitmask & MAT_BIT_FRONT_DIFFUSE) {
 664       foreach (light, list) {
 665          SCALE_3V( light->_MatDiffuse[0], light->Diffuse,
 666                    mat[MAT_ATTRIB_FRONT_DIFFUSE] );
 667       }
 668    }
 669
 670    if (bitmask & MAT_BIT_BACK_DIFFUSE) {
 671       foreach (light, list) {
 672          SCALE_3V( light->_MatDiffuse[1], light->Diffuse,
 673                    mat[MAT_ATTRIB_BACK_DIFFUSE] );
 674       }
 675    }
 676
 677    /* update material specular values */
 678    if (bitmask & MAT_BIT_FRONT_SPECULAR) {
 679       foreach (light, list) {
 680          SCALE_3V( light->_MatSpecular[0], light->Specular,
 681                    mat[MAT_ATTRIB_FRONT_SPECULAR]);
 682       }
 683    }
 684
 685    if (bitmask & MAT_BIT_BACK_SPECULAR) {
 686       foreach (light, list) {
 687          SCALE_3V( light->_MatSpecular[1], light->Specular,
 688                    mat[MAT_ATTRIB_BACK_SPECULAR]);
 689       }
 690    }
 691 }
 692
 693
 694 /*
 695  * Update the current materials from the given rgba color
 696  * according to the bitmask in _ColorMaterialBitmask, which is
 697  * set by glColorMaterial().
 698  */
 699 void
 700 _mesa_update_color_material( struct gl_context *ctx, const GLfloat color[4] )
 701 {
 702    const GLbitfield bitmask = ctx->Light._ColorMaterialBitmask;
 703    struct gl_material *mat = &ctx->Light.Material;
 704    int i;
 705
 706    for (i = 0 ; i < MAT_ATTRIB_MAX ; i++)
 707       if (bitmask & (1<<i))
 708          COPY_4FV( mat->Attrib[i], color );
 709
 710    _mesa_update_material( ctx, bitmask );
 711 }
 712
 713
 714 void GLAPIENTRY
 715 _mesa_ColorMaterial( GLenum face, GLenum mode )
 716 {
 717    GET_CURRENT_CONTEXT(ctx);
 718    GLuint bitmask;
 719    GLuint legal = (MAT_BIT_FRONT_EMISSION | MAT_BIT_BACK_EMISSION |
 720                    MAT_BIT_FRONT_SPECULAR | MAT_BIT_BACK_SPECULAR |
 721                    MAT_BIT_FRONT_DIFFUSE  | MAT_BIT_BACK_DIFFUSE  |
 722                    MAT_BIT_FRONT_AMBIENT  | MAT_BIT_BACK_AMBIENT);
 723    ASSERT_OUTSIDE_BEGIN_END(ctx);
 724
 725    if (MESA_VERBOSE&VERBOSE_API)
 726       _mesa_debug(ctx, "glColorMaterial %s %s\n",
 727                   _mesa_lookup_enum_by_nr(face),
 728                   _mesa_lookup_enum_by_nr(mode));
 729
 730    bitmask = _mesa_material_bitmask(ctx, face, mode, legal, "glColorMaterial");
 731    if (bitmask == 0)
 732       return; /* error was recorded */
 733
 734    if (ctx->Light._ColorMaterialBitmask == bitmask &&
 735        ctx->Light.ColorMaterialFace == face &&
 736        ctx->Light.ColorMaterialMode == mode)
 737       return;
 738
 739    FLUSH_VERTICES(ctx, _NEW_LIGHT);
 740    ctx->Light._ColorMaterialBitmask = bitmask;
 741    ctx->Light.ColorMaterialFace = face;
 742    ctx->Light.ColorMaterialMode = mode;
 743
 744    if (ctx->Light.ColorMaterialEnabled) {
 745       FLUSH_CURRENT( ctx, 0 );
 746       _mesa_update_color_material(ctx,ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 747    }
 748
 749    if (ctx->Driver.ColorMaterial)
 750       ctx->Driver.ColorMaterial( ctx, face, mode );
 751 }
 752
 753
 754 void GLAPIENTRY
 755 _mesa_GetMaterialfv( GLenum face, GLenum pname, GLfloat *params )
 756 {
 757    GET_CURRENT_CONTEXT(ctx);
 758    GLuint f;
 759    GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
 760    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* update materials */
 761
 762    FLUSH_CURRENT(ctx, 0); /* update ctx->Light.Material from vertex buffer */
 763
 764    if (face==GL_FRONT) {
 765       f = 0;
 766    }
 767    else if (face==GL_BACK) {
 768       f = 1;
 769    }
 770    else {
 771       _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(face)" );
 772       return;
 773    }
 774
 775    switch (pname) {
 776       case GL_AMBIENT:
 777          COPY_4FV( params, mat[MAT_ATTRIB_AMBIENT(f)] );
 778          break;
 779       case GL_DIFFUSE:
 780          COPY_4FV( params, mat[MAT_ATTRIB_DIFFUSE(f)] );
 781          break;
 782       case GL_SPECULAR:
 783          COPY_4FV( params, mat[MAT_ATTRIB_SPECULAR(f)] );
 784          break;
 785       case GL_EMISSION:
 786          COPY_4FV( params, mat[MAT_ATTRIB_EMISSION(f)] );
 787          break;
 788       case GL_SHININESS:
 789          *params = mat[MAT_ATTRIB_SHININESS(f)][0];
 790          break;
 791       case GL_COLOR_INDEXES:
 792          params[0] = mat[MAT_ATTRIB_INDEXES(f)][0];
 793          params[1] = mat[MAT_ATTRIB_INDEXES(f)][1];
 794          params[2] = mat[MAT_ATTRIB_INDEXES(f)][2];
 795          break;
 796       default:
 797          _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
 798    }
 799 }
 800
 801
 802 void GLAPIENTRY
 803 _mesa_GetMaterialiv( GLenum face, GLenum pname, GLint *params )
 804 {
 805    GET_CURRENT_CONTEXT(ctx);
 806    GLuint f;
 807    GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
 808    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* update materials */
 809
 810    FLUSH_CURRENT(ctx, 0); /* update ctx->Light.Material from vertex buffer */
 811
 812    if (face==GL_FRONT) {
 813       f = 0;
 814    }
 815    else if (face==GL_BACK) {
 816       f = 1;
 817    }
 818    else {
 819       _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialiv(face)" );
 820       return;
 821    }
 822    switch (pname) {
 823       case GL_AMBIENT:
 824          params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][0] );
 825          params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][1] );
 826          params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][2] );
 827          params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][3] );
 828          break;
 829       case GL_DIFFUSE:
 830          params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][0] );
 831          params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][1] );
 832          params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][2] );
 833          params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][3] );
 834          break;
 835       case GL_SPECULAR:
 836          params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][0] );
 837          params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][1] );
 838          params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][2] );
 839          params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][3] );
 840          break;
 841       case GL_EMISSION:
 842          params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][0] );
 843          params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][1] );
 844          params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][2] );
 845          params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][3] );
 846          break;
 847       case GL_SHININESS:
 848          *params = IROUND( mat[MAT_ATTRIB_SHININESS(f)][0] );
 849          break;
 850       case GL_COLOR_INDEXES:
 851          params[0] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][0] );
 852          params[1] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][1] );
 853          params[2] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][2] );
 854          break;
 855       default:
 856          _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
 857    }
 858 }
 859
 860
 861
 862 /**
 863  * Examine current lighting parameters to determine if the optimized lighting
 864  * function can be used.
 865  * Also, precompute some lighting values such as the products of light
 866  * source and material ambient, diffuse and specular coefficients.
 867  */
 868 void
 869 _mesa_update_lighting( struct gl_context *ctx )
 870 {
 871    GLbitfield flags = 0;
 872    struct gl_light *light;
 873    ctx->Light._NeedEyeCoords = GL_FALSE;
 874
 875    if (!ctx->Light.Enabled)
 876       return;
 877
 878    foreach(light, &ctx->Light.EnabledList) {
 879       flags |= light->_Flags;
 880    }
 881
 882    ctx->Light._NeedVertices =
 883       ((flags & (LIGHT_POSITIONAL|LIGHT_SPOT)) ||
 884        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR ||
 885        ctx->Light.Model.LocalViewer);
 886
 887    ctx->Light._NeedEyeCoords = ((flags & LIGHT_POSITIONAL) ||
 888                                 ctx->Light.Model.LocalViewer);
 889
 890    /* XXX: This test is overkill & needs to be fixed both for software and
 891     * hardware t&l drivers.  The above should be sufficient & should
 892     * be tested to verify this.
 893     */
 894    if (ctx->Light._NeedVertices)
 895       ctx->Light._NeedEyeCoords = GL_TRUE;
 896
 897    /* Precompute some shading values.  Although we reference
 898     * Light.Material here, we can get away without flushing
 899     * FLUSH_UPDATE_CURRENT, as when any outstanding material changes
 900     * are flushed, they will update the derived state at that time.
 901     */
 902    if (ctx->Light.Model.TwoSide)
 903       _mesa_update_material(ctx,
 904                             MAT_BIT_FRONT_EMISSION |
 905                             MAT_BIT_FRONT_AMBIENT |
 906                             MAT_BIT_FRONT_DIFFUSE |
 907                             MAT_BIT_FRONT_SPECULAR |
 908                             MAT_BIT_BACK_EMISSION |
 909                             MAT_BIT_BACK_AMBIENT |
 910                             MAT_BIT_BACK_DIFFUSE |
 911                             MAT_BIT_BACK_SPECULAR);
 912    else
 913       _mesa_update_material(ctx,
 914                             MAT_BIT_FRONT_EMISSION |
 915                             MAT_BIT_FRONT_AMBIENT |
 916                             MAT_BIT_FRONT_DIFFUSE |
 917                             MAT_BIT_FRONT_SPECULAR);
 918 }
 919
 920
 921 /**
 922  * Update state derived from light position, spot direction.
 923  * Called upon:
 924  *   _NEW_MODELVIEW
 925  *   _NEW_LIGHT
 926  *   _TNL_NEW_NEED_EYE_COORDS
 927  *
 928  * Update on (_NEW_MODELVIEW | _NEW_LIGHT) when lighting is enabled.
 929  * Also update on lighting space changes.
 930  */
 931 static void
 932 compute_light_positions( struct gl_context *ctx )
 933 {
 934    struct gl_light *light;
 935    static const GLfloat eye_z[3] = { 0, 0, 1 };
 936
 937    if (!ctx->Light.Enabled)
 938       return;
 939
 940    if (ctx->_NeedEyeCoords) {
 941       COPY_3V( ctx->_EyeZDir, eye_z );
 942    }
 943    else {
 944       TRANSFORM_NORMAL( ctx->_EyeZDir, eye_z, ctx->ModelviewMatrixStack.Top->m );
 945    }
 946
 947    foreach (light, &ctx->Light.EnabledList) {
 948
 949       if (ctx->_NeedEyeCoords) {
 950          /* _Position is in eye coordinate space */
 951          COPY_4FV( light->_Position, light->EyePosition );
 952       }
 953       else {
 954          /* _Position is in object coordinate space */
 955          TRANSFORM_POINT( light->_Position, ctx->ModelviewMatrixStack.Top->inv,
 956                           light->EyePosition );
 957       }
 958
 959       if (!(light->_Flags & LIGHT_POSITIONAL)) {
 960          /* VP (VP) = Normalize( Position ) */
 961          COPY_3V( light->_VP_inf_norm, light->_Position );
 962          NORMALIZE_3FV( light->_VP_inf_norm );
 963
 964          if (!ctx->Light.Model.LocalViewer) {
 965             /* _h_inf_norm = Normalize( V_to_P + <0,0,1> ) */
 966             ADD_3V( light->_h_inf_norm, light->_VP_inf_norm, ctx->_EyeZDir);
 967             NORMALIZE_3FV( light->_h_inf_norm );
 968          }
 969          light->_VP_inf_spot_attenuation = 1.0;
 970       }
 971       else {
 972          /* positional light w/ homogeneous coordinate, divide by W */
 973          GLfloat wInv = (GLfloat)1.0 / light->_Position[3];
 974          light->_Position[0] *= wInv;
 975          light->_Position[1] *= wInv;
 976          light->_Position[2] *= wInv;
 977       }
 978
 979       if (light->_Flags & LIGHT_SPOT) {
 980          /* Note: we normalize the spot direction now */
 981
 982          if (ctx->_NeedEyeCoords) {
 983             COPY_3V( light->_NormSpotDirection, light->SpotDirection );
 984             NORMALIZE_3FV( light->_NormSpotDirection );
 985          }
 986          else {
 987             GLfloat spotDir[3];
 988             COPY_3V(spotDir, light->SpotDirection);
 989             NORMALIZE_3FV(spotDir);
 990             TRANSFORM_NORMAL( light->_NormSpotDirection,
 991                               spotDir,
 992                               ctx->ModelviewMatrixStack.Top->m);
 993          }
 994
 995          NORMALIZE_3FV( light->_NormSpotDirection );
 996
 997          if (!(light->_Flags & LIGHT_POSITIONAL)) {
 998             GLfloat PV_dot_dir = - DOT3(light->_VP_inf_norm,
 999                                         light->_NormSpotDirection);
1000
1001             if (PV_dot_dir > light->_CosCutoff) {
1002                light->_VP_inf_spot_attenuation =
1003                   powf(PV_dot_dir, light->SpotExponent);
1004             }
1005             else {
1006                light->_VP_inf_spot_attenuation = 0;
1007             }
1008          }
1009       }
1010    }
1011 }
1012
1013
1014
1015 static void
1016 update_modelview_scale( struct gl_context *ctx )
1017 {
1018    ctx->_ModelViewInvScale = 1.0F;
1019    if (!_math_matrix_is_length_preserving(ctx->ModelviewMatrixStack.Top)) {
1020       const GLfloat *m = ctx->ModelviewMatrixStack.Top->inv;
1021       GLfloat f = m[2] * m[2] + m[6] * m[6] + m[10] * m[10];
1022       if (f < 1e-12) f = 1.0;
1023       if (ctx->_NeedEyeCoords)
1024          ctx->_ModelViewInvScale = (GLfloat) INV_SQRTF(f);
1025       else
1026          ctx->_ModelViewInvScale = (GLfloat) SQRTF(f);
1027    }
1028 }
1029
1030
1031 /**
1032  * Bring up to date any state that relies on _NeedEyeCoords.
1033  */
1034 void
1035 _mesa_update_tnl_spaces( struct gl_context *ctx, GLuint new_state )
1036 {
1037    const GLuint oldneedeyecoords = ctx->_NeedEyeCoords;
1038
1039    (void) new_state;
1040    ctx->_NeedEyeCoords = GL_FALSE;
1041
1042    if (ctx->_ForceEyeCoords ||
1043        (ctx->Texture._GenFlags & TEXGEN_NEED_EYE_COORD) ||
1044        ctx->Point._Attenuated ||
1045        ctx->Light._NeedEyeCoords)
1046       ctx->_NeedEyeCoords = GL_TRUE;
1047
1048    if (ctx->Light.Enabled &&
1049        !_math_matrix_is_length_preserving(ctx->ModelviewMatrixStack.Top))
1050       ctx->_NeedEyeCoords = GL_TRUE;
1051
1052    /* Check if the truth-value interpretations of the bitfields have
1053     * changed:
1054     */
1055    if (oldneedeyecoords != ctx->_NeedEyeCoords) {
1056       /* Recalculate all state that depends on _NeedEyeCoords.
1057        */
1058       update_modelview_scale(ctx);
1059       compute_light_positions( ctx );
1060
1061       if (ctx->Driver.LightingSpaceChange)
1062          ctx->Driver.LightingSpaceChange( ctx );
1063    }
1064    else {
1065       GLuint new_state2 = ctx->NewState;
1066
1067       /* Recalculate that same state only if it has been invalidated
1068        * by other statechanges.
1069        */
1070       if (new_state2 & _NEW_MODELVIEW)
1071          update_modelview_scale(ctx);
1072
1073       if (new_state2 & (_NEW_LIGHT|_NEW_MODELVIEW))
1074          compute_light_positions( ctx );
1075    }
1076 }
1077
1078
1079 /**
1080  * Drivers may need this if the hardware tnl unit doesn't support the
1081  * light-in-modelspace optimization.  It's also useful for debugging.
1082  */
1083 void
1084 _mesa_allow_light_in_model( struct gl_context *ctx, GLboolean flag )
1085 {
1086    ctx->_ForceEyeCoords = !flag;
1087    ctx->NewState |= _NEW_POINT; /* one of the bits from
1088                                  * _MESA_NEW_NEED_EYE_COORDS.
1089                                  */
1090 }
1091
1092
1093
1094 /**********************************************************************/
1095 /*****                      Initialization                        *****/
1096 /**********************************************************************/
1097
1098 /**
1099  * Initialize the n-th light data structure.
1100  *
1101  * \param l pointer to the gl_light structure to be initialized.
1102  * \param n number of the light.
1103  * \note The defaults for light 0 are different than the other lights.
1104  */
1105 static void
1106 init_light( struct gl_light *l, GLuint n )
1107 {
1108    make_empty_list( l );
1109
1110    ASSIGN_4V( l->Ambient, 0.0, 0.0, 0.0, 1.0 );
1111    if (n==0) {
1112       ASSIGN_4V( l->Diffuse, 1.0, 1.0, 1.0, 1.0 );
1113       ASSIGN_4V( l->Specular, 1.0, 1.0, 1.0, 1.0 );
1114    }
1115    else {
1116       ASSIGN_4V( l->Diffuse, 0.0, 0.0, 0.0, 1.0 );
1117       ASSIGN_4V( l->Specular, 0.0, 0.0, 0.0, 1.0 );
1118    }
1119    ASSIGN_4V( l->EyePosition, 0.0, 0.0, 1.0, 0.0 );
1120    ASSIGN_3V( l->SpotDirection, 0.0, 0.0, -1.0 );
1121    l->SpotExponent = 0.0;
1122    l->SpotCutoff = 180.0;
1123    l->_CosCutoff = 0.0;         /* KW: -ve values not admitted */
1124    l->ConstantAttenuation = 1.0;
1125    l->LinearAttenuation = 0.0;
1126    l->QuadraticAttenuation = 0.0;
1127    l->Enabled = GL_FALSE;
1128 }
1129
1130
1131 /**
1132  * Initialize the light model data structure.
1133  *
1134  * \param lm pointer to the gl_lightmodel structure to be initialized.
1135  */
1136 static void
1137 init_lightmodel( struct gl_lightmodel *lm )
1138 {
1139    ASSIGN_4V( lm->Ambient, 0.2F, 0.2F, 0.2F, 1.0F );
1140    lm->LocalViewer = GL_FALSE;
1141    lm->TwoSide = GL_FALSE;
1142    lm->ColorControl = GL_SINGLE_COLOR;
1143 }
1144
1145
1146 /**
1147  * Initialize the material data structure.
1148  *
1149  * \param m pointer to the gl_material structure to be initialized.
1150  */
1151 static void
1152 init_material( struct gl_material *m )
1153 {
1154    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_AMBIENT],  0.2F, 0.2F, 0.2F, 1.0F );
1155    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_DIFFUSE],  0.8F, 0.8F, 0.8F, 1.0F );
1156    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_SPECULAR], 0.0F, 0.0F, 0.0F, 1.0F );
1157    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_EMISSION], 0.0F, 0.0F, 0.0F, 1.0F );
1158    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_SHININESS], 0.0F, 0.0F, 0.0F, 0.0F );
1159    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_INDEXES], 0.0F, 1.0F, 1.0F, 0.0F );
1160
1161    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_AMBIENT],  0.2F, 0.2F, 0.2F, 1.0F );
1162    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_DIFFUSE],  0.8F, 0.8F, 0.8F, 1.0F );
1163    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_SPECULAR], 0.0F, 0.0F, 0.0F, 1.0F );
1164    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_EMISSION], 0.0F, 0.0F, 0.0F, 1.0F );
1165    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_SHININESS], 0.0F, 0.0F, 0.0F, 0.0F );
1166    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_INDEXES], 0.0F, 1.0F, 1.0F, 0.0F );
1167 }
1168
1169
1170 /**
1171  * Initialize all lighting state for the given context.
1172  */
1173 void
1174 _mesa_init_lighting( struct gl_context *ctx )
1175 {
1176    GLuint i;
1177
1178    /* Lighting group */
1179    for (i = 0; i < MAX_LIGHTS; i++) {
1180       init_light( &ctx->Light.Light[i], i );
1181    }
1182    make_empty_list( &ctx->Light.EnabledList );
1183
1184    init_lightmodel( &ctx->Light.Model );
1185    init_material( &ctx->Light.Material );
1186    ctx->Light.ShadeModel = GL_SMOOTH;
1187    ctx->Light.ProvokingVertex = GL_LAST_VERTEX_CONVENTION_EXT;
1188    ctx->Light.Enabled = GL_FALSE;
1189    ctx->Light.ColorMaterialFace = GL_FRONT_AND_BACK;
1190    ctx->Light.ColorMaterialMode = GL_AMBIENT_AND_DIFFUSE;
1191    ctx->Light._ColorMaterialBitmask = _mesa_material_bitmask( ctx,
1192                                                GL_FRONT_AND_BACK,
1193                                                GL_AMBIENT_AND_DIFFUSE, ~0,
1194                                                NULL );
1195
1196    ctx->Light.ColorMaterialEnabled = GL_FALSE;
1197    ctx->Light.ClampVertexColor = GL_TRUE;
1198
1199    /* Miscellaneous */
1200    ctx->Light._NeedEyeCoords = GL_FALSE;
1201    ctx->_NeedEyeCoords = GL_FALSE;
1202    ctx->_ForceEyeCoords = GL_FALSE;
1203    ctx->_ModelViewInvScale = 1.0;
1204 }
1205
1206
1207 /**
1208  * Deallocate malloc'd lighting state attached to given context.
1209  */
1210 void
1211 _mesa_free_lighting_data( struct gl_context *ctx )
1212 {
1213 }