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_ProvokingVertex(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          if (ctx->API != API_OPENGL)
 470             goto invalid_pname;
 471          newbool = (params[0]!=0.0);
 472          if (ctx->Light.Model.LocalViewer == newbool)
 473             return;
 474          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 475          ctx->Light.Model.LocalViewer = newbool;
 476          break;
 477       case GL_LIGHT_MODEL_TWO_SIDE:
 478          newbool = (params[0]!=0.0);
 479          if (ctx->Light.Model.TwoSide == newbool)
 480             return;
 481          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 482          ctx->Light.Model.TwoSide = newbool;
 483          if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 484             ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 485          else
 486             ctx->_TriangleCaps &= ~DD_TRI_LIGHT_TWOSIDE;
 487          break;
 488       case GL_LIGHT_MODEL_COLOR_CONTROL:
 489          if (ctx->API != API_OPENGL)
 490             goto invalid_pname;
 491          if (params[0] == (GLfloat) GL_SINGLE_COLOR)
 492             newenum = GL_SINGLE_COLOR;
 493          else if (params[0] == (GLfloat) GL_SEPARATE_SPECULAR_COLOR)
 494             newenum = GL_SEPARATE_SPECULAR_COLOR;
 495          else {
 496             _mesa_error( ctx, GL_INVALID_ENUM, "glLightModel(param=0x0%x)",
 497                          (GLint) params[0] );
 498             return;
 499          }
 500          if (ctx->Light.Model.ColorControl == newenum)
 501             return;
 502          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 503          ctx->Light.Model.ColorControl = newenum;
 504          break;
 505       default:
 506          goto invalid_pname;
 507    }
 508
 509    if (ctx->Driver.LightModelfv)
 510       ctx->Driver.LightModelfv( ctx, pname, params );
 511
 512    return;
 513
 514 invalid_pname:
 515    _mesa_error( ctx, GL_INVALID_ENUM, "glLightModel(pname=0x%x)", pname );
 516    return;
 517 }
 518
 519
 520 void GLAPIENTRY
 521 _mesa_LightModeliv( GLenum pname, const GLint *params )
 522 {
 523    GLfloat fparam[4];
 524
 525    switch (pname) {
 526       case GL_LIGHT_MODEL_AMBIENT:
 527          fparam[0] = INT_TO_FLOAT( params[0] );
 528          fparam[1] = INT_TO_FLOAT( params[1] );
 529          fparam[2] = INT_TO_FLOAT( params[2] );
 530          fparam[3] = INT_TO_FLOAT( params[3] );
 531          break;
 532       case GL_LIGHT_MODEL_LOCAL_VIEWER:
 533       case GL_LIGHT_MODEL_TWO_SIDE:
 534       case GL_LIGHT_MODEL_COLOR_CONTROL:
 535          fparam[0] = (GLfloat) params[0];
 536          break;
 537       default:
 538          /* Error will be caught later in gl_LightModelfv */
 539          ASSIGN_4V(fparam, 0.0F, 0.0F, 0.0F, 0.0F);
 540    }
 541    _mesa_LightModelfv( pname, fparam );
 542 }
 543
 544
 545 void GLAPIENTRY
 546 _mesa_LightModeli( GLenum pname, GLint param )
 547 {
 548    GLint iparam[4];
 549    iparam[0] = param;
 550    iparam[1] = iparam[2] = iparam[3] = 0;
 551    _mesa_LightModeliv( pname, iparam );
 552 }
 553
 554
 555 void GLAPIENTRY
 556 _mesa_LightModelf( GLenum pname, GLfloat param )
 557 {
 558    GLfloat fparam[4];
 559    fparam[0] = param;
 560    fparam[1] = fparam[2] = fparam[3] = 0.0F;
 561    _mesa_LightModelfv( pname, fparam );
 562 }
 563
 564
 565
 566 /********** MATERIAL **********/
 567
 568
 569 /*
 570  * Given a face and pname value (ala glColorMaterial), compute a bitmask
 571  * of the targeted material values.
 572  */
 573 GLuint
 574 _mesa_material_bitmask( struct gl_context *ctx, GLenum face, GLenum pname,
 575                         GLuint legal, const char *where )
 576 {
 577    GLuint bitmask = 0;
 578
 579    /* Make a bitmask indicating what material attribute(s) we're updating */
 580    switch (pname) {
 581       case GL_EMISSION:
 582          bitmask |= MAT_BIT_FRONT_EMISSION | MAT_BIT_BACK_EMISSION;
 583          break;
 584       case GL_AMBIENT:
 585          bitmask |= MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT;
 586          break;
 587       case GL_DIFFUSE:
 588          bitmask |= MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE;
 589          break;
 590       case GL_SPECULAR:
 591          bitmask |= MAT_BIT_FRONT_SPECULAR | MAT_BIT_BACK_SPECULAR;
 592          break;
 593       case GL_SHININESS:
 594          bitmask |= MAT_BIT_FRONT_SHININESS | MAT_BIT_BACK_SHININESS;
 595          break;
 596       case GL_AMBIENT_AND_DIFFUSE:
 597          bitmask |= MAT_BIT_FRONT_AMBIENT | MAT_BIT_BACK_AMBIENT;
 598          bitmask |= MAT_BIT_FRONT_DIFFUSE | MAT_BIT_BACK_DIFFUSE;
 599          break;
 600       case GL_COLOR_INDEXES:
 601          bitmask |= MAT_BIT_FRONT_INDEXES  | MAT_BIT_BACK_INDEXES;
 602          break;
 603       default:
 604          _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
 605          return 0;
 606    }
 607
 608    if (face==GL_FRONT) {
 609       bitmask &= FRONT_MATERIAL_BITS;
 610    }
 611    else if (face==GL_BACK) {
 612       bitmask &= BACK_MATERIAL_BITS;
 613    }
 614    else if (face != GL_FRONT_AND_BACK) {
 615       _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
 616       return 0;
 617    }
 618
 619    if (bitmask & ~legal) {
 620       _mesa_error( ctx, GL_INVALID_ENUM, "%s", where );
 621       return 0;
 622    }
 623
 624    return bitmask;
 625 }
 626
 627
 628
 629 /* Update derived values following a change in ctx->Light.Material
 630  */
 631 void
 632 _mesa_update_material( struct gl_context *ctx, GLuint bitmask )
 633 {
 634    struct gl_light *light, *list = &ctx->Light.EnabledList;
 635    GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
 636
 637    if (MESA_VERBOSE & VERBOSE_MATERIAL)
 638       _mesa_debug(ctx, "_mesa_update_material, mask 0x%x\n", bitmask);
 639
 640    if (!bitmask)
 641       return;
 642
 643    /* update material ambience */
 644    if (bitmask & MAT_BIT_FRONT_AMBIENT) {
 645       foreach (light, list) {
 646          SCALE_3V( light->_MatAmbient[0], light->Ambient,
 647                    mat[MAT_ATTRIB_FRONT_AMBIENT]);
 648       }
 649    }
 650
 651    if (bitmask & MAT_BIT_BACK_AMBIENT) {
 652       foreach (light, list) {
 653          SCALE_3V( light->_MatAmbient[1], light->Ambient,
 654                    mat[MAT_ATTRIB_BACK_AMBIENT]);
 655       }
 656    }
 657
 658    /* update BaseColor = emission + scene's ambience * material's ambience */
 659    if (bitmask & (MAT_BIT_FRONT_EMISSION | MAT_BIT_FRONT_AMBIENT)) {
 660       COPY_3V( ctx->Light._BaseColor[0], mat[MAT_ATTRIB_FRONT_EMISSION] );
 661       ACC_SCALE_3V( ctx->Light._BaseColor[0], mat[MAT_ATTRIB_FRONT_AMBIENT],
 662                     ctx->Light.Model.Ambient );
 663    }
 664
 665    if (bitmask & (MAT_BIT_BACK_EMISSION | MAT_BIT_BACK_AMBIENT)) {
 666       COPY_3V( ctx->Light._BaseColor[1], mat[MAT_ATTRIB_BACK_EMISSION] );
 667       ACC_SCALE_3V( ctx->Light._BaseColor[1], mat[MAT_ATTRIB_BACK_AMBIENT],
 668                     ctx->Light.Model.Ambient );
 669    }
 670
 671    /* update material diffuse values */
 672    if (bitmask & MAT_BIT_FRONT_DIFFUSE) {
 673       foreach (light, list) {
 674          SCALE_3V( light->_MatDiffuse[0], light->Diffuse,
 675                    mat[MAT_ATTRIB_FRONT_DIFFUSE] );
 676       }
 677    }
 678
 679    if (bitmask & MAT_BIT_BACK_DIFFUSE) {
 680       foreach (light, list) {
 681          SCALE_3V( light->_MatDiffuse[1], light->Diffuse,
 682                    mat[MAT_ATTRIB_BACK_DIFFUSE] );
 683       }
 684    }
 685
 686    /* update material specular values */
 687    if (bitmask & MAT_BIT_FRONT_SPECULAR) {
 688       foreach (light, list) {
 689          SCALE_3V( light->_MatSpecular[0], light->Specular,
 690                    mat[MAT_ATTRIB_FRONT_SPECULAR]);
 691       }
 692    }
 693
 694    if (bitmask & MAT_BIT_BACK_SPECULAR) {
 695       foreach (light, list) {
 696          SCALE_3V( light->_MatSpecular[1], light->Specular,
 697                    mat[MAT_ATTRIB_BACK_SPECULAR]);
 698       }
 699    }
 700 }
 701
 702
 703 /*
 704  * Update the current materials from the given rgba color
 705  * according to the bitmask in _ColorMaterialBitmask, which is
 706  * set by glColorMaterial().
 707  */
 708 void
 709 _mesa_update_color_material( struct gl_context *ctx, const GLfloat color[4] )
 710 {
 711    const GLbitfield bitmask = ctx->Light._ColorMaterialBitmask;
 712    struct gl_material *mat = &ctx->Light.Material;
 713    int i;
 714
 715    for (i = 0 ; i < MAT_ATTRIB_MAX ; i++)
 716       if (bitmask & (1<<i))
 717          COPY_4FV( mat->Attrib[i], color );
 718
 719    _mesa_update_material( ctx, bitmask );
 720 }
 721
 722
 723 void GLAPIENTRY
 724 _mesa_ColorMaterial( GLenum face, GLenum mode )
 725 {
 726    GET_CURRENT_CONTEXT(ctx);
 727    GLuint bitmask;
 728    GLuint legal = (MAT_BIT_FRONT_EMISSION | MAT_BIT_BACK_EMISSION |
 729                    MAT_BIT_FRONT_SPECULAR | MAT_BIT_BACK_SPECULAR |
 730                    MAT_BIT_FRONT_DIFFUSE  | MAT_BIT_BACK_DIFFUSE  |
 731                    MAT_BIT_FRONT_AMBIENT  | MAT_BIT_BACK_AMBIENT);
 732    ASSERT_OUTSIDE_BEGIN_END(ctx);
 733
 734    if (MESA_VERBOSE&VERBOSE_API)
 735       _mesa_debug(ctx, "glColorMaterial %s %s\n",
 736                   _mesa_lookup_enum_by_nr(face),
 737                   _mesa_lookup_enum_by_nr(mode));
 738
 739    bitmask = _mesa_material_bitmask(ctx, face, mode, legal, "glColorMaterial");
 740    if (bitmask == 0)
 741       return; /* error was recorded */
 742
 743    if (ctx->Light._ColorMaterialBitmask == bitmask &&
 744        ctx->Light.ColorMaterialFace == face &&
 745        ctx->Light.ColorMaterialMode == mode)
 746       return;
 747
 748    FLUSH_VERTICES(ctx, _NEW_LIGHT);
 749    ctx->Light._ColorMaterialBitmask = bitmask;
 750    ctx->Light.ColorMaterialFace = face;
 751    ctx->Light.ColorMaterialMode = mode;
 752
 753    if (ctx->Light.ColorMaterialEnabled) {
 754       FLUSH_CURRENT( ctx, 0 );
 755       _mesa_update_color_material(ctx,ctx->Current.Attrib[VERT_ATTRIB_COLOR0]);
 756    }
 757
 758    if (ctx->Driver.ColorMaterial)
 759       ctx->Driver.ColorMaterial( ctx, face, mode );
 760 }
 761
 762
 763 void GLAPIENTRY
 764 _mesa_GetMaterialfv( GLenum face, GLenum pname, GLfloat *params )
 765 {
 766    GET_CURRENT_CONTEXT(ctx);
 767    GLuint f;
 768    GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
 769    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* update materials */
 770
 771    FLUSH_CURRENT(ctx, 0); /* update ctx->Light.Material from vertex buffer */
 772
 773    if (face==GL_FRONT) {
 774       f = 0;
 775    }
 776    else if (face==GL_BACK) {
 777       f = 1;
 778    }
 779    else {
 780       _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(face)" );
 781       return;
 782    }
 783
 784    switch (pname) {
 785       case GL_AMBIENT:
 786          COPY_4FV( params, mat[MAT_ATTRIB_AMBIENT(f)] );
 787          break;
 788       case GL_DIFFUSE:
 789          COPY_4FV( params, mat[MAT_ATTRIB_DIFFUSE(f)] );
 790          break;
 791       case GL_SPECULAR:
 792          COPY_4FV( params, mat[MAT_ATTRIB_SPECULAR(f)] );
 793          break;
 794       case GL_EMISSION:
 795          COPY_4FV( params, mat[MAT_ATTRIB_EMISSION(f)] );
 796          break;
 797       case GL_SHININESS:
 798          *params = mat[MAT_ATTRIB_SHININESS(f)][0];
 799          break;
 800       case GL_COLOR_INDEXES:
 801          if (ctx->API != API_OPENGL) {
 802             _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
 803             return;
 804          }
 805          params[0] = mat[MAT_ATTRIB_INDEXES(f)][0];
 806          params[1] = mat[MAT_ATTRIB_INDEXES(f)][1];
 807          params[2] = mat[MAT_ATTRIB_INDEXES(f)][2];
 808          break;
 809       default:
 810          _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
 811    }
 812 }
 813
 814
 815 void GLAPIENTRY
 816 _mesa_GetMaterialiv( GLenum face, GLenum pname, GLint *params )
 817 {
 818    GET_CURRENT_CONTEXT(ctx);
 819    GLuint f;
 820    GLfloat (*mat)[4] = ctx->Light.Material.Attrib;
 821    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* update materials */
 822
 823    ASSERT(ctx->API == API_OPENGL);
 824
 825    FLUSH_CURRENT(ctx, 0); /* update ctx->Light.Material from vertex buffer */
 826
 827    if (face==GL_FRONT) {
 828       f = 0;
 829    }
 830    else if (face==GL_BACK) {
 831       f = 1;
 832    }
 833    else {
 834       _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialiv(face)" );
 835       return;
 836    }
 837    switch (pname) {
 838       case GL_AMBIENT:
 839          params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][0] );
 840          params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][1] );
 841          params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][2] );
 842          params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_AMBIENT(f)][3] );
 843          break;
 844       case GL_DIFFUSE:
 845          params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][0] );
 846          params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][1] );
 847          params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][2] );
 848          params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_DIFFUSE(f)][3] );
 849          break;
 850       case GL_SPECULAR:
 851          params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][0] );
 852          params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][1] );
 853          params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][2] );
 854          params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_SPECULAR(f)][3] );
 855          break;
 856       case GL_EMISSION:
 857          params[0] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][0] );
 858          params[1] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][1] );
 859          params[2] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][2] );
 860          params[3] = FLOAT_TO_INT( mat[MAT_ATTRIB_EMISSION(f)][3] );
 861          break;
 862       case GL_SHININESS:
 863          *params = IROUND( mat[MAT_ATTRIB_SHININESS(f)][0] );
 864          break;
 865       case GL_COLOR_INDEXES:
 866          params[0] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][0] );
 867          params[1] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][1] );
 868          params[2] = IROUND( mat[MAT_ATTRIB_INDEXES(f)][2] );
 869          break;
 870       default:
 871          _mesa_error( ctx, GL_INVALID_ENUM, "glGetMaterialfv(pname)" );
 872    }
 873 }
 874
 875
 876
 877 /**
 878  * Examine current lighting parameters to determine if the optimized lighting
 879  * function can be used.
 880  * Also, precompute some lighting values such as the products of light
 881  * source and material ambient, diffuse and specular coefficients.
 882  */
 883 void
 884 _mesa_update_lighting( struct gl_context *ctx )
 885 {
 886    GLbitfield flags = 0;
 887    struct gl_light *light;
 888    ctx->Light._NeedEyeCoords = GL_FALSE;
 889
 890    if (!ctx->Light.Enabled)
 891       return;
 892
 893    foreach(light, &ctx->Light.EnabledList) {
 894       flags |= light->_Flags;
 895    }
 896
 897    ctx->Light._NeedVertices =
 898       ((flags & (LIGHT_POSITIONAL|LIGHT_SPOT)) ||
 899        ctx->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR ||
 900        ctx->Light.Model.LocalViewer);
 901
 902    ctx->Light._NeedEyeCoords = ((flags & LIGHT_POSITIONAL) ||
 903                                 ctx->Light.Model.LocalViewer);
 904
 905    /* XXX: This test is overkill & needs to be fixed both for software and
 906     * hardware t&l drivers.  The above should be sufficient & should
 907     * be tested to verify this.
 908     */
 909    if (ctx->Light._NeedVertices)
 910       ctx->Light._NeedEyeCoords = GL_TRUE;
 911
 912    /* Precompute some shading values.  Although we reference
 913     * Light.Material here, we can get away without flushing
 914     * FLUSH_UPDATE_CURRENT, as when any outstanding material changes
 915     * are flushed, they will update the derived state at that time.
 916     */
 917    if (ctx->Light.Model.TwoSide)
 918       _mesa_update_material(ctx,
 919                             MAT_BIT_FRONT_EMISSION |
 920                             MAT_BIT_FRONT_AMBIENT |
 921                             MAT_BIT_FRONT_DIFFUSE |
 922                             MAT_BIT_FRONT_SPECULAR |
 923                             MAT_BIT_BACK_EMISSION |
 924                             MAT_BIT_BACK_AMBIENT |
 925                             MAT_BIT_BACK_DIFFUSE |
 926                             MAT_BIT_BACK_SPECULAR);
 927    else
 928       _mesa_update_material(ctx,
 929                             MAT_BIT_FRONT_EMISSION |
 930                             MAT_BIT_FRONT_AMBIENT |
 931                             MAT_BIT_FRONT_DIFFUSE |
 932                             MAT_BIT_FRONT_SPECULAR);
 933 }
 934
 935
 936 /**
 937  * Update state derived from light position, spot direction.
 938  * Called upon:
 939  *   _NEW_MODELVIEW
 940  *   _NEW_LIGHT
 941  *   _TNL_NEW_NEED_EYE_COORDS
 942  *
 943  * Update on (_NEW_MODELVIEW | _NEW_LIGHT) when lighting is enabled.
 944  * Also update on lighting space changes.
 945  */
 946 static void
 947 compute_light_positions( struct gl_context *ctx )
 948 {
 949    struct gl_light *light;
 950    static const GLfloat eye_z[3] = { 0, 0, 1 };
 951
 952    if (!ctx->Light.Enabled)
 953       return;
 954
 955    if (ctx->_NeedEyeCoords) {
 956       COPY_3V( ctx->_EyeZDir, eye_z );
 957    }
 958    else {
 959       TRANSFORM_NORMAL( ctx->_EyeZDir, eye_z, ctx->ModelviewMatrixStack.Top->m );
 960    }
 961
 962    foreach (light, &ctx->Light.EnabledList) {
 963
 964       if (ctx->_NeedEyeCoords) {
 965          /* _Position is in eye coordinate space */
 966          COPY_4FV( light->_Position, light->EyePosition );
 967       }
 968       else {
 969          /* _Position is in object coordinate space */
 970          TRANSFORM_POINT( light->_Position, ctx->ModelviewMatrixStack.Top->inv,
 971                           light->EyePosition );
 972       }
 973
 974       if (!(light->_Flags & LIGHT_POSITIONAL)) {
 975          /* VP (VP) = Normalize( Position ) */
 976          COPY_3V( light->_VP_inf_norm, light->_Position );
 977          NORMALIZE_3FV( light->_VP_inf_norm );
 978
 979          if (!ctx->Light.Model.LocalViewer) {
 980             /* _h_inf_norm = Normalize( V_to_P + <0,0,1> ) */
 981             ADD_3V( light->_h_inf_norm, light->_VP_inf_norm, ctx->_EyeZDir);
 982             NORMALIZE_3FV( light->_h_inf_norm );
 983          }
 984          light->_VP_inf_spot_attenuation = 1.0;
 985       }
 986       else {
 987          /* positional light w/ homogeneous coordinate, divide by W */
 988          GLfloat wInv = (GLfloat)1.0 / light->_Position[3];
 989          light->_Position[0] *= wInv;
 990          light->_Position[1] *= wInv;
 991          light->_Position[2] *= wInv;
 992       }
 993
 994       if (light->_Flags & LIGHT_SPOT) {
 995          /* Note: we normalize the spot direction now */
 996
 997          if (ctx->_NeedEyeCoords) {
 998             COPY_3V( light->_NormSpotDirection, light->SpotDirection );
 999             NORMALIZE_3FV( light->_NormSpotDirection );
1000          }
1001          else {
1002             GLfloat spotDir[3];
1003             COPY_3V(spotDir, light->SpotDirection);
1004             NORMALIZE_3FV(spotDir);
1005             TRANSFORM_NORMAL( light->_NormSpotDirection,
1006                               spotDir,
1007                               ctx->ModelviewMatrixStack.Top->m);
1008          }
1009
1010          NORMALIZE_3FV( light->_NormSpotDirection );
1011
1012          if (!(light->_Flags & LIGHT_POSITIONAL)) {
1013             GLfloat PV_dot_dir = - DOT3(light->_VP_inf_norm,
1014                                         light->_NormSpotDirection);
1015
1016             if (PV_dot_dir > light->_CosCutoff) {
1017                light->_VP_inf_spot_attenuation =
1018                   powf(PV_dot_dir, light->SpotExponent);
1019             }
1020             else {
1021                light->_VP_inf_spot_attenuation = 0;
1022             }
1023          }
1024       }
1025    }
1026 }
1027
1028
1029
1030 static void
1031 update_modelview_scale( struct gl_context *ctx )
1032 {
1033    ctx->_ModelViewInvScale = 1.0F;
1034    if (!_math_matrix_is_length_preserving(ctx->ModelviewMatrixStack.Top)) {
1035       const GLfloat *m = ctx->ModelviewMatrixStack.Top->inv;
1036       GLfloat f = m[2] * m[2] + m[6] * m[6] + m[10] * m[10];
1037       if (f < 1e-12) f = 1.0;
1038       if (ctx->_NeedEyeCoords)
1039          ctx->_ModelViewInvScale = (GLfloat) INV_SQRTF(f);
1040       else
1041          ctx->_ModelViewInvScale = (GLfloat) sqrtf(f);
1042    }
1043 }
1044
1045
1046 /**
1047  * Bring up to date any state that relies on _NeedEyeCoords.
1048  */
1049 void
1050 _mesa_update_tnl_spaces( struct gl_context *ctx, GLuint new_state )
1051 {
1052    const GLuint oldneedeyecoords = ctx->_NeedEyeCoords;
1053
1054    (void) new_state;
1055    ctx->_NeedEyeCoords = GL_FALSE;
1056
1057    if (ctx->_ForceEyeCoords ||
1058        (ctx->Texture._GenFlags & TEXGEN_NEED_EYE_COORD) ||
1059        ctx->Point._Attenuated ||
1060        ctx->Light._NeedEyeCoords)
1061       ctx->_NeedEyeCoords = GL_TRUE;
1062
1063    if (ctx->Light.Enabled &&
1064        !_math_matrix_is_length_preserving(ctx->ModelviewMatrixStack.Top))
1065       ctx->_NeedEyeCoords = GL_TRUE;
1066
1067    /* Check if the truth-value interpretations of the bitfields have
1068     * changed:
1069     */
1070    if (oldneedeyecoords != ctx->_NeedEyeCoords) {
1071       /* Recalculate all state that depends on _NeedEyeCoords.
1072        */
1073       update_modelview_scale(ctx);
1074       compute_light_positions( ctx );
1075
1076       if (ctx->Driver.LightingSpaceChange)
1077          ctx->Driver.LightingSpaceChange( ctx );
1078    }
1079    else {
1080       GLuint new_state2 = ctx->NewState;
1081
1082       /* Recalculate that same state only if it has been invalidated
1083        * by other statechanges.
1084        */
1085       if (new_state2 & _NEW_MODELVIEW)
1086          update_modelview_scale(ctx);
1087
1088       if (new_state2 & (_NEW_LIGHT|_NEW_MODELVIEW))
1089          compute_light_positions( ctx );
1090    }
1091 }
1092
1093
1094 /**
1095  * Drivers may need this if the hardware tnl unit doesn't support the
1096  * light-in-modelspace optimization.  It's also useful for debugging.
1097  */
1098 void
1099 _mesa_allow_light_in_model( struct gl_context *ctx, GLboolean flag )
1100 {
1101    ctx->_ForceEyeCoords = !flag;
1102    ctx->NewState |= _NEW_POINT; /* one of the bits from
1103                                  * _MESA_NEW_NEED_EYE_COORDS.
1104                                  */
1105 }
1106
1107
1108
1109 /**********************************************************************/
1110 /*****                      Initialization                        *****/
1111 /**********************************************************************/
1112
1113 /**
1114  * Initialize the n-th light data structure.
1115  *
1116  * \param l pointer to the gl_light structure to be initialized.
1117  * \param n number of the light.
1118  * \note The defaults for light 0 are different than the other lights.
1119  */
1120 static void
1121 init_light( struct gl_light *l, GLuint n )
1122 {
1123    make_empty_list( l );
1124
1125    ASSIGN_4V( l->Ambient, 0.0, 0.0, 0.0, 1.0 );
1126    if (n==0) {
1127       ASSIGN_4V( l->Diffuse, 1.0, 1.0, 1.0, 1.0 );
1128       ASSIGN_4V( l->Specular, 1.0, 1.0, 1.0, 1.0 );
1129    }
1130    else {
1131       ASSIGN_4V( l->Diffuse, 0.0, 0.0, 0.0, 1.0 );
1132       ASSIGN_4V( l->Specular, 0.0, 0.0, 0.0, 1.0 );
1133    }
1134    ASSIGN_4V( l->EyePosition, 0.0, 0.0, 1.0, 0.0 );
1135    ASSIGN_3V( l->SpotDirection, 0.0, 0.0, -1.0 );
1136    l->SpotExponent = 0.0;
1137    l->SpotCutoff = 180.0;
1138    l->_CosCutoff = 0.0;         /* KW: -ve values not admitted */
1139    l->ConstantAttenuation = 1.0;
1140    l->LinearAttenuation = 0.0;
1141    l->QuadraticAttenuation = 0.0;
1142    l->Enabled = GL_FALSE;
1143 }
1144
1145
1146 /**
1147  * Initialize the light model data structure.
1148  *
1149  * \param lm pointer to the gl_lightmodel structure to be initialized.
1150  */
1151 static void
1152 init_lightmodel( struct gl_lightmodel *lm )
1153 {
1154    ASSIGN_4V( lm->Ambient, 0.2F, 0.2F, 0.2F, 1.0F );
1155    lm->LocalViewer = GL_FALSE;
1156    lm->TwoSide = GL_FALSE;
1157    lm->ColorControl = GL_SINGLE_COLOR;
1158 }
1159
1160
1161 /**
1162  * Initialize the material data structure.
1163  *
1164  * \param m pointer to the gl_material structure to be initialized.
1165  */
1166 static void
1167 init_material( struct gl_material *m )
1168 {
1169    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_AMBIENT],  0.2F, 0.2F, 0.2F, 1.0F );
1170    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_DIFFUSE],  0.8F, 0.8F, 0.8F, 1.0F );
1171    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_SPECULAR], 0.0F, 0.0F, 0.0F, 1.0F );
1172    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_EMISSION], 0.0F, 0.0F, 0.0F, 1.0F );
1173    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_SHININESS], 0.0F, 0.0F, 0.0F, 0.0F );
1174    ASSIGN_4V( m->Attrib[MAT_ATTRIB_FRONT_INDEXES], 0.0F, 1.0F, 1.0F, 0.0F );
1175
1176    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_AMBIENT],  0.2F, 0.2F, 0.2F, 1.0F );
1177    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_DIFFUSE],  0.8F, 0.8F, 0.8F, 1.0F );
1178    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_SPECULAR], 0.0F, 0.0F, 0.0F, 1.0F );
1179    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_EMISSION], 0.0F, 0.0F, 0.0F, 1.0F );
1180    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_SHININESS], 0.0F, 0.0F, 0.0F, 0.0F );
1181    ASSIGN_4V( m->Attrib[MAT_ATTRIB_BACK_INDEXES], 0.0F, 1.0F, 1.0F, 0.0F );
1182 }
1183
1184
1185 /**
1186  * Initialize all lighting state for the given context.
1187  */
1188 void
1189 _mesa_init_lighting( struct gl_context *ctx )
1190 {
1191    GLuint i;
1192
1193    /* Lighting group */
1194    for (i = 0; i < MAX_LIGHTS; i++) {
1195       init_light( &ctx->Light.Light[i], i );
1196    }
1197    make_empty_list( &ctx->Light.EnabledList );
1198
1199    init_lightmodel( &ctx->Light.Model );
1200    init_material( &ctx->Light.Material );
1201    ctx->Light.ShadeModel = GL_SMOOTH;
1202    ctx->Light.ProvokingVertex = GL_LAST_VERTEX_CONVENTION_EXT;
1203    ctx->Light.Enabled = GL_FALSE;
1204    ctx->Light.ColorMaterialFace = GL_FRONT_AND_BACK;
1205    ctx->Light.ColorMaterialMode = GL_AMBIENT_AND_DIFFUSE;
1206    ctx->Light._ColorMaterialBitmask = _mesa_material_bitmask( ctx,
1207                                                GL_FRONT_AND_BACK,
1208                                                GL_AMBIENT_AND_DIFFUSE, ~0,
1209                                                NULL );
1210
1211    ctx->Light.ColorMaterialEnabled = GL_FALSE;
1212    ctx->Light.ClampVertexColor = GL_TRUE;
1213
1214    /* Miscellaneous */
1215    ctx->Light._NeedEyeCoords = GL_FALSE;
1216    ctx->_NeedEyeCoords = GL_FALSE;
1217    ctx->_ForceEyeCoords = GL_FALSE;
1218    ctx->_ModelViewInvScale = 1.0;
1219 }
1220
1221
1222 /**
1223  * Deallocate malloc'd lighting state attached to given context.
1224  */
1225 void
1226 _mesa_free_lighting_data( struct gl_context *ctx )
1227 {
1228 }