reactos/dll/opengl/mesa/main/enable.c

   1 /**
   2  * \file enable.c
   3  * Enable/disable/query GL capabilities.
   4  */
   5
   6 /*
   7  * Mesa 3-D graphics library
   8  *
   9  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included
  19  * in all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  22  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  24  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  25  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  26  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27  */
  28
  29
  30 #include <precomp.h>
  31
  32 #define CHECK_EXTENSION(EXTNAME, CAP)                                   \
  33    if (!ctx->Extensions.EXTNAME) {                                      \
  34       goto invalid_enum_error;                                          \
  35    }
  36
  37
  38 /**
  39  * Helper to enable/disable client-side state.
  40  */
  41 static void
  42 client_state(struct gl_context *ctx, GLenum cap, GLboolean state)
  43 {
  44    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
  45    GLbitfield64 flag;
  46    GLboolean *var;
  47
  48    switch (cap) {
  49       case GL_VERTEX_ARRAY:
  50          var = &arrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled;
  51          flag = VERT_BIT_POS;
  52          break;
  53       case GL_NORMAL_ARRAY:
  54          var = &arrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled;
  55          flag = VERT_BIT_NORMAL;
  56          break;
  57       case GL_COLOR_ARRAY:
  58          var = &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled;
  59          flag = VERT_BIT_COLOR0;
  60          break;
  61       case GL_INDEX_ARRAY:
  62          var = &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled;
  63          flag = VERT_BIT_COLOR_INDEX;
  64          break;
  65       case GL_TEXTURE_COORD_ARRAY:
  66          var = &arrayObj->VertexAttrib[VERT_ATTRIB_TEX].Enabled;
  67          flag = VERT_BIT_TEX;
  68          break;
  69       case GL_EDGE_FLAG_ARRAY:
  70          var = &arrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled;
  71          flag = VERT_BIT_EDGEFLAG;
  72          break;
  73       case GL_FOG_COORDINATE_ARRAY_EXT:
  74          var = &arrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled;
  75          flag = VERT_BIT_FOG;
  76          break;
  77       case GL_SECONDARY_COLOR_ARRAY_EXT:
  78          var = &arrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled;
  79          flag = VERT_BIT_COLOR1;
  80          break;
  81
  82 #if FEATURE_point_size_array
  83       case GL_POINT_SIZE_ARRAY_OES:
  84          var = &arrayObj->VertexAttrib[VERT_ATTRIB_POINT_SIZE].Enabled;
  85          flag = VERT_BIT_POINT_SIZE;
  86          break;
  87 #endif
  88
  89 #if FEATURE_NV_vertex_program
  90       case GL_VERTEX_ATTRIB_ARRAY0_NV:
  91       case GL_VERTEX_ATTRIB_ARRAY1_NV:
  92       case GL_VERTEX_ATTRIB_ARRAY2_NV:
  93       case GL_VERTEX_ATTRIB_ARRAY3_NV:
  94       case GL_VERTEX_ATTRIB_ARRAY4_NV:
  95       case GL_VERTEX_ATTRIB_ARRAY5_NV:
  96       case GL_VERTEX_ATTRIB_ARRAY6_NV:
  97       case GL_VERTEX_ATTRIB_ARRAY7_NV:
  98       case GL_VERTEX_ATTRIB_ARRAY8_NV:
  99       case GL_VERTEX_ATTRIB_ARRAY9_NV:
 100       case GL_VERTEX_ATTRIB_ARRAY10_NV:
 101       case GL_VERTEX_ATTRIB_ARRAY11_NV:
 102       case GL_VERTEX_ATTRIB_ARRAY12_NV:
 103       case GL_VERTEX_ATTRIB_ARRAY13_NV:
 104       case GL_VERTEX_ATTRIB_ARRAY14_NV:
 105       case GL_VERTEX_ATTRIB_ARRAY15_NV:
 106          CHECK_EXTENSION(NV_vertex_program, cap);
 107          {
 108             GLint n = (GLint) cap - GL_VERTEX_ATTRIB_ARRAY0_NV;
 109             ASSERT(VERT_ATTRIB_GENERIC(n) < Elements(ctx->Array.ArrayObj->VertexAttrib));
 110             var = &arrayObj->VertexAttrib[VERT_ATTRIB_GENERIC(n)].Enabled;
 111             flag = VERT_BIT_GENERIC(n);
 112          }
 113          break;
 114 #endif /* FEATURE_NV_vertex_program */
 115
 116       default:
 117          goto invalid_enum_error;
 118    }
 119
 120    if (*var == state)
 121       return;
 122
 123    FLUSH_VERTICES(ctx, _NEW_ARRAY);
 124    ctx->Array.NewState |= flag;
 125
 126    _ae_invalidate_state(ctx, _NEW_ARRAY);
 127
 128    *var = state;
 129
 130    if (state)
 131       ctx->Array.ArrayObj->_Enabled |= flag;
 132    else
 133       ctx->Array.ArrayObj->_Enabled &= ~flag;
 134
 135    if (ctx->Driver.Enable) {
 136       ctx->Driver.Enable( ctx, cap, state );
 137    }
 138
 139    return;
 140
 141 invalid_enum_error:
 142    _mesa_error(ctx, GL_INVALID_ENUM, "gl%sClientState(0x%x)",
 143                state ? "Enable" : "Disable", cap);
 144 }
 145
 146
 147 /**
 148  * Enable GL capability.
 149  * \param cap  state to enable/disable.
 150  *
 151  * Get's the current context, assures that we're outside glBegin()/glEnd() and
 152  * calls client_state().
 153  */
 154 void GLAPIENTRY
 155 _mesa_EnableClientState( GLenum cap )
 156 {
 157    GET_CURRENT_CONTEXT(ctx);
 158    ASSERT_OUTSIDE_BEGIN_END(ctx);
 159    client_state( ctx, cap, GL_TRUE );
 160 }
 161
 162
 163 /**
 164  * Disable GL capability.
 165  * \param cap  state to enable/disable.
 166  *
 167  * Get's the current context, assures that we're outside glBegin()/glEnd() and
 168  * calls client_state().
 169  */
 170 void GLAPIENTRY
 171 _mesa_DisableClientState( GLenum cap )
 172 {
 173    GET_CURRENT_CONTEXT(ctx);
 174    ASSERT_OUTSIDE_BEGIN_END(ctx);
 175    client_state( ctx, cap, GL_FALSE );
 176 }
 177
 178
 179 #undef CHECK_EXTENSION
 180 #define CHECK_EXTENSION(EXTNAME, CAP)                                   \
 181    if (!ctx->Extensions.EXTNAME) {                                      \
 182       goto invalid_enum_error;                                          \
 183    }
 184
 185 #define CHECK_EXTENSION2(EXT1, EXT2, CAP)                               \
 186    if (!ctx->Extensions.EXT1 && !ctx->Extensions.EXT2) {                \
 187       goto invalid_enum_error;                                          \
 188    }
 189
 190
 191
 192 /**
 193  * Return pointer to current texture unit for setting/getting coordinate
 194  * state.
 195  * Note that we'll set GL_INVALID_OPERATION and return NULL if the active
 196  * texture unit is higher than the number of supported coordinate units.
 197  */
 198 static inline struct gl_texture_unit *
 199 get_texcoord_unit(struct gl_context *ctx)
 200 {
 201    return &ctx->Texture.Unit;
 202 }
 203
 204
 205 /**
 206  * Helper function to enable or disable a texture target.
 207  * \param bit  one of the TEXTURE_x_BIT values
 208  * \return GL_TRUE if state is changing or GL_FALSE if no change
 209  */
 210 static GLboolean
 211 enable_texture(struct gl_context *ctx, GLboolean state, GLbitfield texBit)
 212 {
 213    struct gl_texture_unit *texUnit = &ctx->Texture.Unit;
 214    const GLbitfield newenabled = state
 215       ? (texUnit->Enabled | texBit) : (texUnit->Enabled & ~texBit);
 216
 217    if (texUnit->Enabled == newenabled)
 218        return GL_FALSE;
 219
 220    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 221    texUnit->Enabled = newenabled;
 222    return GL_TRUE;
 223 }
 224
 225
 226 /**
 227  * Helper function to enable or disable state.
 228  *
 229  * \param ctx GL context.
 230  * \param cap  the state to enable/disable
 231  * \param state whether to enable or disable the specified capability.
 232  *
 233  * Updates the current context and flushes the vertices as needed. For
 234  * capabilities associated with extensions it verifies that those extensions
 235  * are effectivly present before updating. Notifies the driver via
 236  * dd_function_table::Enable.
 237  */
 238 void
 239 _mesa_set_enable(struct gl_context *ctx, GLenum cap, GLboolean state)
 240 {
 241    if (MESA_VERBOSE & VERBOSE_API)
 242       _mesa_debug(ctx, "%s %s (newstate is %x)\n",
 243                   state ? "glEnable" : "glDisable",
 244                   _mesa_lookup_enum_by_nr(cap),
 245                   ctx->NewState);
 246
 247    switch (cap) {
 248       case GL_ALPHA_TEST:
 249          if (ctx->Color.AlphaEnabled == state)
 250             return;
 251          FLUSH_VERTICES(ctx, _NEW_COLOR);
 252          ctx->Color.AlphaEnabled = state;
 253          break;
 254       case GL_AUTO_NORMAL:
 255          if (ctx->Eval.AutoNormal == state)
 256             return;
 257          FLUSH_VERTICES(ctx, _NEW_EVAL);
 258          ctx->Eval.AutoNormal = state;
 259          break;
 260       case GL_BLEND:
 261          {
 262             if (state != ctx->Color.BlendEnabled) {
 263                FLUSH_VERTICES(ctx, _NEW_COLOR);
 264                ctx->Color.BlendEnabled = state;
 265             }
 266          }
 267          break;
 268 #if FEATURE_userclip
 269       case GL_CLIP_DISTANCE0:
 270       case GL_CLIP_DISTANCE1:
 271       case GL_CLIP_DISTANCE2:
 272       case GL_CLIP_DISTANCE3:
 273       case GL_CLIP_DISTANCE4:
 274       case GL_CLIP_DISTANCE5:
 275       case GL_CLIP_DISTANCE6:
 276       case GL_CLIP_DISTANCE7:
 277          {
 278             const GLuint p = cap - GL_CLIP_DISTANCE0;
 279
 280             if (p >= ctx->Const.MaxClipPlanes)
 281                goto invalid_enum_error;
 282
 283             if ((ctx->Transform.ClipPlanesEnabled & (1 << p))
 284                 == ((GLuint) state << p))
 285                return;
 286
 287             FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 288
 289             if (state) {
 290                ctx->Transform.ClipPlanesEnabled |= (1 << p);
 291                _mesa_update_clip_plane(ctx, p);
 292             }
 293             else {
 294                ctx->Transform.ClipPlanesEnabled &= ~(1 << p);
 295             }
 296          }
 297          break;
 298 #endif
 299       case GL_COLOR_MATERIAL:
 300          if (ctx->Light.ColorMaterialEnabled == state)
 301             return;
 302          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 303          FLUSH_CURRENT(ctx, 0);
 304          ctx->Light.ColorMaterialEnabled = state;
 305          if (state) {
 306             _mesa_update_color_material( ctx,
 307                                   ctx->Current.Attrib[VERT_ATTRIB_COLOR0] );
 308          }
 309          break;
 310       case GL_CULL_FACE:
 311          if (ctx->Polygon.CullFlag == state)
 312             return;
 313          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 314          ctx->Polygon.CullFlag = state;
 315          break;
 316       case GL_DEPTH_TEST:
 317          if (ctx->Depth.Test == state)
 318             return;
 319          FLUSH_VERTICES(ctx, _NEW_DEPTH);
 320          ctx->Depth.Test = state;
 321          break;
 322       case GL_DITHER:
 323          if (ctx->Color.DitherFlag == state)
 324             return;
 325          FLUSH_VERTICES(ctx, _NEW_COLOR);
 326          ctx->Color.DitherFlag = state;
 327          break;
 328       case GL_FOG:
 329          if (ctx->Fog.Enabled == state)
 330             return;
 331          FLUSH_VERTICES(ctx, _NEW_FOG);
 332          ctx->Fog.Enabled = state;
 333          break;
 334       case GL_LIGHT0:
 335       case GL_LIGHT1:
 336       case GL_LIGHT2:
 337       case GL_LIGHT3:
 338       case GL_LIGHT4:
 339       case GL_LIGHT5:
 340       case GL_LIGHT6:
 341       case GL_LIGHT7:
 342          if (ctx->Light.Light[cap-GL_LIGHT0].Enabled == state)
 343             return;
 344          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 345          ctx->Light.Light[cap-GL_LIGHT0].Enabled = state;
 346          if (state) {
 347             insert_at_tail(&ctx->Light.EnabledList,
 348                            &ctx->Light.Light[cap-GL_LIGHT0]);
 349          }
 350          else {
 351             remove_from_list(&ctx->Light.Light[cap-GL_LIGHT0]);
 352          }
 353          break;
 354       case GL_LIGHTING:
 355          if (ctx->Light.Enabled == state)
 356             return;
 357          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 358          ctx->Light.Enabled = state;
 359          if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 360             ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 361          else
 362             ctx->_TriangleCaps &= ~DD_TRI_LIGHT_TWOSIDE;
 363          break;
 364       case GL_LINE_SMOOTH:
 365          if (ctx->Line.SmoothFlag == state)
 366             return;
 367          FLUSH_VERTICES(ctx, _NEW_LINE);
 368          ctx->Line.SmoothFlag = state;
 369          ctx->_TriangleCaps ^= DD_LINE_SMOOTH;
 370          break;
 371       case GL_LINE_STIPPLE:
 372          if (ctx->Line.StippleFlag == state)
 373             return;
 374          FLUSH_VERTICES(ctx, _NEW_LINE);
 375          ctx->Line.StippleFlag = state;
 376          ctx->_TriangleCaps ^= DD_LINE_STIPPLE;
 377          break;
 378       case GL_INDEX_LOGIC_OP:
 379          if (ctx->Color.IndexLogicOpEnabled == state)
 380             return;
 381          FLUSH_VERTICES(ctx, _NEW_COLOR);
 382          ctx->Color.IndexLogicOpEnabled = state;
 383          break;
 384       case GL_COLOR_LOGIC_OP:
 385          if (ctx->Color.ColorLogicOpEnabled == state)
 386             return;
 387          FLUSH_VERTICES(ctx, _NEW_COLOR);
 388          ctx->Color.ColorLogicOpEnabled = state;
 389          break;
 390       case GL_MAP1_COLOR_4:
 391          if (ctx->Eval.Map1Color4 == state)
 392             return;
 393          FLUSH_VERTICES(ctx, _NEW_EVAL);
 394          ctx->Eval.Map1Color4 = state;
 395          break;
 396       case GL_MAP1_INDEX:
 397          if (ctx->Eval.Map1Index == state)
 398             return;
 399          FLUSH_VERTICES(ctx, _NEW_EVAL);
 400          ctx->Eval.Map1Index = state;
 401          break;
 402       case GL_MAP1_NORMAL:
 403          if (ctx->Eval.Map1Normal == state)
 404             return;
 405          FLUSH_VERTICES(ctx, _NEW_EVAL);
 406          ctx->Eval.Map1Normal = state;
 407          break;
 408       case GL_MAP1_TEXTURE_COORD_1:
 409          if (ctx->Eval.Map1TextureCoord1 == state)
 410             return;
 411          FLUSH_VERTICES(ctx, _NEW_EVAL);
 412          ctx->Eval.Map1TextureCoord1 = state;
 413          break;
 414       case GL_MAP1_TEXTURE_COORD_2:
 415          if (ctx->Eval.Map1TextureCoord2 == state)
 416             return;
 417          FLUSH_VERTICES(ctx, _NEW_EVAL);
 418          ctx->Eval.Map1TextureCoord2 = state;
 419          break;
 420       case GL_MAP1_TEXTURE_COORD_3:
 421          if (ctx->Eval.Map1TextureCoord3 == state)
 422             return;
 423          FLUSH_VERTICES(ctx, _NEW_EVAL);
 424          ctx->Eval.Map1TextureCoord3 = state;
 425          break;
 426       case GL_MAP1_TEXTURE_COORD_4:
 427          if (ctx->Eval.Map1TextureCoord4 == state)
 428             return;
 429          FLUSH_VERTICES(ctx, _NEW_EVAL);
 430          ctx->Eval.Map1TextureCoord4 = state;
 431          break;
 432       case GL_MAP1_VERTEX_3:
 433          if (ctx->Eval.Map1Vertex3 == state)
 434             return;
 435          FLUSH_VERTICES(ctx, _NEW_EVAL);
 436          ctx->Eval.Map1Vertex3 = state;
 437          break;
 438       case GL_MAP1_VERTEX_4:
 439          if (ctx->Eval.Map1Vertex4 == state)
 440             return;
 441          FLUSH_VERTICES(ctx, _NEW_EVAL);
 442          ctx->Eval.Map1Vertex4 = state;
 443          break;
 444       case GL_MAP2_COLOR_4:
 445          if (ctx->Eval.Map2Color4 == state)
 446             return;
 447          FLUSH_VERTICES(ctx, _NEW_EVAL);
 448          ctx->Eval.Map2Color4 = state;
 449          break;
 450       case GL_MAP2_INDEX:
 451          if (ctx->Eval.Map2Index == state)
 452             return;
 453          FLUSH_VERTICES(ctx, _NEW_EVAL);
 454          ctx->Eval.Map2Index = state;
 455          break;
 456       case GL_MAP2_NORMAL:
 457          if (ctx->Eval.Map2Normal == state)
 458             return;
 459          FLUSH_VERTICES(ctx, _NEW_EVAL);
 460          ctx->Eval.Map2Normal = state;
 461          break;
 462       case GL_MAP2_TEXTURE_COORD_1:
 463          if (ctx->Eval.Map2TextureCoord1 == state)
 464             return;
 465          FLUSH_VERTICES(ctx, _NEW_EVAL);
 466          ctx->Eval.Map2TextureCoord1 = state;
 467          break;
 468       case GL_MAP2_TEXTURE_COORD_2:
 469          if (ctx->Eval.Map2TextureCoord2 == state)
 470             return;
 471          FLUSH_VERTICES(ctx, _NEW_EVAL);
 472          ctx->Eval.Map2TextureCoord2 = state;
 473          break;
 474       case GL_MAP2_TEXTURE_COORD_3:
 475          if (ctx->Eval.Map2TextureCoord3 == state)
 476             return;
 477          FLUSH_VERTICES(ctx, _NEW_EVAL);
 478          ctx->Eval.Map2TextureCoord3 = state;
 479          break;
 480       case GL_MAP2_TEXTURE_COORD_4:
 481          if (ctx->Eval.Map2TextureCoord4 == state)
 482             return;
 483          FLUSH_VERTICES(ctx, _NEW_EVAL);
 484          ctx->Eval.Map2TextureCoord4 = state;
 485          break;
 486       case GL_MAP2_VERTEX_3:
 487          if (ctx->Eval.Map2Vertex3 == state)
 488             return;
 489          FLUSH_VERTICES(ctx, _NEW_EVAL);
 490          ctx->Eval.Map2Vertex3 = state;
 491          break;
 492       case GL_MAP2_VERTEX_4:
 493          if (ctx->Eval.Map2Vertex4 == state)
 494             return;
 495          FLUSH_VERTICES(ctx, _NEW_EVAL);
 496          ctx->Eval.Map2Vertex4 = state;
 497          break;
 498       case GL_NORMALIZE:
 499          if (ctx->Transform.Normalize == state)
 500             return;
 501          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 502          ctx->Transform.Normalize = state;
 503          break;
 504       case GL_POINT_SMOOTH:
 505          if (ctx->Point.SmoothFlag == state)
 506             return;
 507          FLUSH_VERTICES(ctx, _NEW_POINT);
 508          ctx->Point.SmoothFlag = state;
 509          ctx->_TriangleCaps ^= DD_POINT_SMOOTH;
 510          break;
 511       case GL_POLYGON_SMOOTH:
 512          if (ctx->Polygon.SmoothFlag == state)
 513             return;
 514          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 515          ctx->Polygon.SmoothFlag = state;
 516          ctx->_TriangleCaps ^= DD_TRI_SMOOTH;
 517          break;
 518       case GL_POLYGON_STIPPLE:
 519          if (ctx->Polygon.StippleFlag == state)
 520             return;
 521          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 522          ctx->Polygon.StippleFlag = state;
 523          ctx->_TriangleCaps ^= DD_TRI_STIPPLE;
 524          break;
 525       case GL_POLYGON_OFFSET_POINT:
 526          if (ctx->Polygon.OffsetPoint == state)
 527             return;
 528          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 529          ctx->Polygon.OffsetPoint = state;
 530          break;
 531       case GL_POLYGON_OFFSET_LINE:
 532          if (ctx->Polygon.OffsetLine == state)
 533             return;
 534          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 535          ctx->Polygon.OffsetLine = state;
 536          break;
 537       case GL_POLYGON_OFFSET_FILL:
 538          if (ctx->Polygon.OffsetFill == state)
 539             return;
 540          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 541          ctx->Polygon.OffsetFill = state;
 542          break;
 543       case GL_RESCALE_NORMAL_EXT:
 544          if (ctx->Transform.RescaleNormals == state)
 545             return;
 546          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 547          ctx->Transform.RescaleNormals = state;
 548          break;
 549       case GL_SCISSOR_TEST:
 550          if (ctx->Scissor.Enabled == state)
 551             return;
 552          FLUSH_VERTICES(ctx, _NEW_SCISSOR);
 553          ctx->Scissor.Enabled = state;
 554          break;
 555       case GL_STENCIL_TEST:
 556          if (ctx->Stencil.Enabled == state)
 557             return;
 558          FLUSH_VERTICES(ctx, _NEW_STENCIL);
 559          ctx->Stencil.Enabled = state;
 560          break;
 561       case GL_TEXTURE_1D:
 562          if (!enable_texture(ctx, state, TEXTURE_1D_BIT)) {
 563             return;
 564          }
 565          break;
 566       case GL_TEXTURE_2D:
 567          if (!enable_texture(ctx, state, TEXTURE_2D_BIT)) {
 568             return;
 569          }
 570          break;
 571       case GL_TEXTURE_GEN_S:
 572       case GL_TEXTURE_GEN_T:
 573       case GL_TEXTURE_GEN_R:
 574       case GL_TEXTURE_GEN_Q:
 575          {
 576             struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 577             if (texUnit) {
 578                GLbitfield coordBit = S_BIT << (cap - GL_TEXTURE_GEN_S);
 579                GLbitfield newenabled = texUnit->TexGenEnabled & ~coordBit;
 580                if (state)
 581                   newenabled |= coordBit;
 582                if (texUnit->TexGenEnabled == newenabled)
 583                   return;
 584                FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 585                texUnit->TexGenEnabled = newenabled;
 586             }
 587          }
 588          break;
 589
 590 #if FEATURE_ES1
 591       case GL_TEXTURE_GEN_STR_OES:
 592          /* disable S, T, and R at the same time */
 593          {
 594             struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 595             if (texUnit) {
 596                GLuint newenabled =
 597                   texUnit->TexGenEnabled & ~STR_BITS;
 598                if (state)
 599                   newenabled |= STR_BITS;
 600                if (texUnit->TexGenEnabled == newenabled)
 601                   return;
 602                FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 603                texUnit->TexGenEnabled = newenabled;
 604             }
 605          }
 606          break;
 607 #endif
 608
 609       /* client-side state */
 610       case GL_VERTEX_ARRAY:
 611       case GL_NORMAL_ARRAY:
 612       case GL_COLOR_ARRAY:
 613       case GL_INDEX_ARRAY:
 614       case GL_TEXTURE_COORD_ARRAY:
 615       case GL_EDGE_FLAG_ARRAY:
 616       case GL_FOG_COORDINATE_ARRAY_EXT:
 617       case GL_SECONDARY_COLOR_ARRAY_EXT:
 618       case GL_POINT_SIZE_ARRAY_OES:
 619          client_state( ctx, cap, state );
 620          return;
 621
 622       /* GL_ARB_texture_cube_map */
 623       case GL_TEXTURE_CUBE_MAP_ARB:
 624          CHECK_EXTENSION(ARB_texture_cube_map, cap);
 625          if (!enable_texture(ctx, state, TEXTURE_CUBE_BIT)) {
 626             return;
 627          }
 628          break;
 629
 630       /* GL_ARB_multisample */
 631       case GL_MULTISAMPLE_ARB:
 632          if (ctx->Multisample.Enabled == state)
 633             return;
 634          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 635          ctx->Multisample.Enabled = state;
 636          break;
 637       case GL_SAMPLE_ALPHA_TO_COVERAGE_ARB:
 638          if (ctx->Multisample.SampleAlphaToCoverage == state)
 639             return;
 640          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 641          ctx->Multisample.SampleAlphaToCoverage = state;
 642          break;
 643       case GL_SAMPLE_ALPHA_TO_ONE_ARB:
 644          if (ctx->Multisample.SampleAlphaToOne == state)
 645             return;
 646          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 647          ctx->Multisample.SampleAlphaToOne = state;
 648          break;
 649       case GL_SAMPLE_COVERAGE_ARB:
 650          if (ctx->Multisample.SampleCoverage == state)
 651             return;
 652          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 653          ctx->Multisample.SampleCoverage = state;
 654          break;
 655       case GL_SAMPLE_COVERAGE_INVERT_ARB:
 656          if (ctx->Multisample.SampleCoverageInvert == state)
 657             return;
 658          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 659          ctx->Multisample.SampleCoverageInvert = state;
 660          break;
 661
 662       /* GL_IBM_rasterpos_clip */
 663       case GL_RASTER_POSITION_UNCLIPPED_IBM:
 664          CHECK_EXTENSION(IBM_rasterpos_clip, cap);
 665          if (ctx->Transform.RasterPositionUnclipped == state)
 666             return;
 667          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 668          ctx->Transform.RasterPositionUnclipped = state;
 669          break;
 670
 671       /* GL_NV_point_sprite */
 672       case GL_POINT_SPRITE_NV:
 673          CHECK_EXTENSION2(NV_point_sprite, ARB_point_sprite, cap);
 674          if (ctx->Point.PointSprite == state)
 675             return;
 676          FLUSH_VERTICES(ctx, _NEW_POINT);
 677          ctx->Point.PointSprite = state;
 678          break;
 679
 680       /* GL_EXT_depth_bounds_test */
 681       case GL_DEPTH_BOUNDS_TEST_EXT:
 682          CHECK_EXTENSION(EXT_depth_bounds_test, cap);
 683          if (ctx->Depth.BoundsTest == state)
 684             return;
 685          FLUSH_VERTICES(ctx, _NEW_DEPTH);
 686          ctx->Depth.BoundsTest = state;
 687          break;
 688
 689       default:
 690          goto invalid_enum_error;
 691    }
 692
 693    if (ctx->Driver.Enable) {
 694       ctx->Driver.Enable( ctx, cap, state );
 695    }
 696
 697    return;
 698
 699 invalid_enum_error:
 700    _mesa_error(ctx, GL_INVALID_ENUM, "gl%s(0x%x)",
 701                state ? "Enable" : "Disable", cap);
 702 }
 703
 704
 705 /**
 706  * Enable GL capability.  Called by glEnable()
 707  * \param cap  state to enable.
 708  */
 709 void GLAPIENTRY
 710 _mesa_Enable( GLenum cap )
 711 {
 712    GET_CURRENT_CONTEXT(ctx);
 713    ASSERT_OUTSIDE_BEGIN_END(ctx);
 714
 715    _mesa_set_enable( ctx, cap, GL_TRUE );
 716 }
 717
 718
 719 /**
 720  * Disable GL capability.  Called by glDisable()
 721  * \param cap  state to disable.
 722  */
 723 void GLAPIENTRY
 724 _mesa_Disable( GLenum cap )
 725 {
 726    GET_CURRENT_CONTEXT(ctx);
 727    ASSERT_OUTSIDE_BEGIN_END(ctx);
 728
 729    _mesa_set_enable( ctx, cap, GL_FALSE );
 730 }
 731
 732
 733 #undef CHECK_EXTENSION
 734 #define CHECK_EXTENSION(EXTNAME)                        \
 735    if (!ctx->Extensions.EXTNAME) {                      \
 736       goto invalid_enum_error;                          \
 737    }
 738
 739 #undef CHECK_EXTENSION2
 740 #define CHECK_EXTENSION2(EXT1, EXT2)                            \
 741    if (!ctx->Extensions.EXT1 && !ctx->Extensions.EXT2) {        \
 742       goto invalid_enum_error;                                  \
 743    }
 744
 745
 746 /**
 747  * Helper function to determine whether a texture target is enabled.
 748  */
 749 static GLboolean
 750 is_texture_enabled(struct gl_context *ctx, GLbitfield bit)
 751 {
 752    const struct gl_texture_unit *const texUnit =
 753        &ctx->Texture.Unit;
 754    return (texUnit->Enabled & bit) ? GL_TRUE : GL_FALSE;
 755 }
 756
 757
 758 /**
 759  * Return simple enable/disable state.
 760  *
 761  * \param cap  state variable to query.
 762  *
 763  * Returns the state of the specified capability from the current GL context.
 764  * For the capabilities associated with extensions verifies that those
 765  * extensions are effectively present before reporting.
 766  */
 767 GLboolean GLAPIENTRY
 768 _mesa_IsEnabled( GLenum cap )
 769 {
 770    GET_CURRENT_CONTEXT(ctx);
 771    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
 772
 773    switch (cap) {
 774       case GL_ALPHA_TEST:
 775          return ctx->Color.AlphaEnabled;
 776       case GL_AUTO_NORMAL:
 777          return ctx->Eval.AutoNormal;
 778       case GL_BLEND:
 779          return ctx->Color.BlendEnabled & 1;  /* return state for buffer[0] */
 780       case GL_CLIP_DISTANCE0:
 781       case GL_CLIP_DISTANCE1:
 782       case GL_CLIP_DISTANCE2:
 783       case GL_CLIP_DISTANCE3:
 784       case GL_CLIP_DISTANCE4:
 785       case GL_CLIP_DISTANCE5:
 786       case GL_CLIP_DISTANCE6:
 787       case GL_CLIP_DISTANCE7: {
 788          const GLuint p = cap - GL_CLIP_DISTANCE0;
 789
 790          if (p >= ctx->Const.MaxClipPlanes)
 791             goto invalid_enum_error;
 792
 793          return (ctx->Transform.ClipPlanesEnabled >> p) & 1;
 794       }
 795       case GL_COLOR_MATERIAL:
 796          return ctx->Light.ColorMaterialEnabled;
 797       case GL_CULL_FACE:
 798          return ctx->Polygon.CullFlag;
 799       case GL_DEPTH_TEST:
 800          return ctx->Depth.Test;
 801       case GL_DITHER:
 802          return ctx->Color.DitherFlag;
 803       case GL_FOG:
 804          return ctx->Fog.Enabled;
 805       case GL_LIGHTING:
 806          return ctx->Light.Enabled;
 807       case GL_LIGHT0:
 808       case GL_LIGHT1:
 809       case GL_LIGHT2:
 810       case GL_LIGHT3:
 811       case GL_LIGHT4:
 812       case GL_LIGHT5:
 813       case GL_LIGHT6:
 814       case GL_LIGHT7:
 815          return ctx->Light.Light[cap-GL_LIGHT0].Enabled;
 816       case GL_LINE_SMOOTH:
 817          return ctx->Line.SmoothFlag;
 818       case GL_LINE_STIPPLE:
 819          return ctx->Line.StippleFlag;
 820       case GL_INDEX_LOGIC_OP:
 821          return ctx->Color.IndexLogicOpEnabled;
 822       case GL_COLOR_LOGIC_OP:
 823          return ctx->Color.ColorLogicOpEnabled;
 824       case GL_MAP1_COLOR_4:
 825          return ctx->Eval.Map1Color4;
 826       case GL_MAP1_INDEX:
 827          return ctx->Eval.Map1Index;
 828       case GL_MAP1_NORMAL:
 829          return ctx->Eval.Map1Normal;
 830       case GL_MAP1_TEXTURE_COORD_1:
 831          return ctx->Eval.Map1TextureCoord1;
 832       case GL_MAP1_TEXTURE_COORD_2:
 833          return ctx->Eval.Map1TextureCoord2;
 834       case GL_MAP1_TEXTURE_COORD_3:
 835          return ctx->Eval.Map1TextureCoord3;
 836       case GL_MAP1_TEXTURE_COORD_4:
 837          return ctx->Eval.Map1TextureCoord4;
 838       case GL_MAP1_VERTEX_3:
 839          return ctx->Eval.Map1Vertex3;
 840       case GL_MAP1_VERTEX_4:
 841          return ctx->Eval.Map1Vertex4;
 842       case GL_MAP2_COLOR_4:
 843          return ctx->Eval.Map2Color4;
 844       case GL_MAP2_INDEX:
 845          return ctx->Eval.Map2Index;
 846       case GL_MAP2_NORMAL:
 847          return ctx->Eval.Map2Normal;
 848       case GL_MAP2_TEXTURE_COORD_1:
 849          return ctx->Eval.Map2TextureCoord1;
 850       case GL_MAP2_TEXTURE_COORD_2:
 851          return ctx->Eval.Map2TextureCoord2;
 852       case GL_MAP2_TEXTURE_COORD_3:
 853          return ctx->Eval.Map2TextureCoord3;
 854       case GL_MAP2_TEXTURE_COORD_4:
 855          return ctx->Eval.Map2TextureCoord4;
 856       case GL_MAP2_VERTEX_3:
 857          return ctx->Eval.Map2Vertex3;
 858       case GL_MAP2_VERTEX_4:
 859          return ctx->Eval.Map2Vertex4;
 860       case GL_NORMALIZE:
 861          return ctx->Transform.Normalize;
 862       case GL_POINT_SMOOTH:
 863          return ctx->Point.SmoothFlag;
 864       case GL_POLYGON_SMOOTH:
 865          return ctx->Polygon.SmoothFlag;
 866       case GL_POLYGON_STIPPLE:
 867          return ctx->Polygon.StippleFlag;
 868       case GL_POLYGON_OFFSET_POINT:
 869          return ctx->Polygon.OffsetPoint;
 870       case GL_POLYGON_OFFSET_LINE:
 871          return ctx->Polygon.OffsetLine;
 872       case GL_POLYGON_OFFSET_FILL:
 873          return ctx->Polygon.OffsetFill;
 874       case GL_RESCALE_NORMAL_EXT:
 875          return ctx->Transform.RescaleNormals;
 876       case GL_SCISSOR_TEST:
 877          return ctx->Scissor.Enabled;
 878       case GL_STENCIL_TEST:
 879          return ctx->Stencil.Enabled;
 880       case GL_TEXTURE_1D:
 881          return is_texture_enabled(ctx, TEXTURE_1D_BIT);
 882       case GL_TEXTURE_2D:
 883          return is_texture_enabled(ctx, TEXTURE_2D_BIT);
 884       case GL_TEXTURE_GEN_S:
 885       case GL_TEXTURE_GEN_T:
 886       case GL_TEXTURE_GEN_R:
 887       case GL_TEXTURE_GEN_Q:
 888          {
 889             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 890             if (texUnit) {
 891                GLbitfield coordBit = S_BIT << (cap - GL_TEXTURE_GEN_S);
 892                return (texUnit->TexGenEnabled & coordBit) ? GL_TRUE : GL_FALSE;
 893             }
 894          }
 895          return GL_FALSE;
 896 #if FEATURE_ES1
 897       case GL_TEXTURE_GEN_STR_OES:
 898          {
 899             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 900             if (texUnit) {
 901                return (texUnit->TexGenEnabled & STR_BITS) == STR_BITS
 902                   ? GL_TRUE : GL_FALSE;
 903             }
 904          }
 905 #endif
 906
 907       /* client-side state */
 908       case GL_VERTEX_ARRAY:
 909          return (ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_POS].Enabled != 0);
 910       case GL_NORMAL_ARRAY:
 911          return (ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled != 0);
 912       case GL_COLOR_ARRAY:
 913          return (ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled != 0);
 914       case GL_INDEX_ARRAY:
 915          return (ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled != 0);
 916       case GL_TEXTURE_COORD_ARRAY:
 917          return (ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_TEX]
 918                  .Enabled != 0);
 919       case GL_EDGE_FLAG_ARRAY:
 920          return (ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled != 0);
 921       case GL_FOG_COORDINATE_ARRAY_EXT:
 922          CHECK_EXTENSION(EXT_fog_coord);
 923          return (ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_FOG].Enabled != 0);
 924       case GL_SECONDARY_COLOR_ARRAY_EXT:
 925          CHECK_EXTENSION(EXT_secondary_color);
 926          return (ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled != 0);
 927 #if FEATURE_point_size_array
 928       case GL_POINT_SIZE_ARRAY_OES:
 929          return (ctx->Array.ArrayObj->VertexAttrib[VERT_ATTRIB_POINT_SIZE].Enabled != 0);
 930 #endif
 931
 932       /* GL_ARB_texture_cube_map */
 933       case GL_TEXTURE_CUBE_MAP_ARB:
 934          CHECK_EXTENSION(ARB_texture_cube_map);
 935          return is_texture_enabled(ctx, TEXTURE_CUBE_BIT);
 936
 937       /* GL_ARB_multisample */
 938       case GL_MULTISAMPLE_ARB:
 939          return ctx->Multisample.Enabled;
 940       case GL_SAMPLE_ALPHA_TO_COVERAGE_ARB:
 941          return ctx->Multisample.SampleAlphaToCoverage;
 942       case GL_SAMPLE_ALPHA_TO_ONE_ARB:
 943          return ctx->Multisample.SampleAlphaToOne;
 944       case GL_SAMPLE_COVERAGE_ARB:
 945          return ctx->Multisample.SampleCoverage;
 946       case GL_SAMPLE_COVERAGE_INVERT_ARB:
 947          return ctx->Multisample.SampleCoverageInvert;
 948
 949       /* GL_IBM_rasterpos_clip */
 950       case GL_RASTER_POSITION_UNCLIPPED_IBM:
 951          CHECK_EXTENSION(IBM_rasterpos_clip);
 952          return ctx->Transform.RasterPositionUnclipped;
 953
 954       /* GL_NV_point_sprite */
 955       case GL_POINT_SPRITE_NV:
 956          CHECK_EXTENSION2(NV_point_sprite, ARB_point_sprite)
 957          return ctx->Point.PointSprite;
 958
 959       /* GL_EXT_depth_bounds_test */
 960       case GL_DEPTH_BOUNDS_TEST_EXT:
 961          CHECK_EXTENSION(EXT_depth_bounds_test);
 962          return ctx->Depth.BoundsTest;
 963
 964       default:
 965          goto invalid_enum_error;
 966    }
 967
 968    return GL_FALSE;
 969
 970 invalid_enum_error:
 971    _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabled(0x%x)", (int) cap);
 972    return GL_FALSE;
 973 }