src/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  * Version:  7.0.3
   9  *
  10  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a
  13  * copy of this software and associated documentation files (the "Software"),
  14  * to deal in the Software without restriction, including without limitation
  15  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  16  * and/or sell copies of the Software, and to permit persons to whom the
  17  * Software is furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included
  20  * in all copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  23  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  25  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  26  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  27  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28  */
  29
  30
  31 #include "glheader.h"
  32 #include "context.h"
  33 #include "enable.h"
  34 #include "light.h"
  35 #include "simple_list.h"
  36 #include "mtypes.h"
  37 #include "enums.h"
  38 #include "api_arrayelt.h"
  39 #include "texstate.h"
  40
  41
  42
  43 #define CHECK_EXTENSION(EXTNAME, CAP)                                   \
  44    if (!ctx->Extensions.EXTNAME) {                                      \
  45       goto invalid_enum_error;                                          \
  46    }
  47
  48
  49 /**
  50  * Helper to enable/disable client-side state.
  51  */
  52 static void
  53 client_state(GLcontext *ctx, GLenum cap, GLboolean state)
  54 {
  55    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
  56    GLuint flag;
  57    GLboolean *var;
  58
  59    switch (cap) {
  60       case GL_VERTEX_ARRAY:
  61          var = &arrayObj->Vertex.Enabled;
  62          flag = _NEW_ARRAY_VERTEX;
  63          break;
  64       case GL_NORMAL_ARRAY:
  65          var = &arrayObj->Normal.Enabled;
  66          flag = _NEW_ARRAY_NORMAL;
  67          break;
  68       case GL_COLOR_ARRAY:
  69          var = &arrayObj->Color.Enabled;
  70          flag = _NEW_ARRAY_COLOR0;
  71          break;
  72       case GL_INDEX_ARRAY:
  73          var = &arrayObj->Index.Enabled;
  74          flag = _NEW_ARRAY_INDEX;
  75          break;
  76       case GL_TEXTURE_COORD_ARRAY:
  77          var = &arrayObj->TexCoord[ctx->Array.ActiveTexture].Enabled;
  78          flag = _NEW_ARRAY_TEXCOORD(ctx->Array.ActiveTexture);
  79          break;
  80       case GL_EDGE_FLAG_ARRAY:
  81          var = &arrayObj->EdgeFlag.Enabled;
  82          flag = _NEW_ARRAY_EDGEFLAG;
  83          break;
  84       case GL_FOG_COORDINATE_ARRAY_EXT:
  85          var = &arrayObj->FogCoord.Enabled;
  86          flag = _NEW_ARRAY_FOGCOORD;
  87          break;
  88       case GL_SECONDARY_COLOR_ARRAY_EXT:
  89          var = &arrayObj->SecondaryColor.Enabled;
  90          flag = _NEW_ARRAY_COLOR1;
  91          break;
  92
  93 #if FEATURE_point_size_array
  94       case GL_POINT_SIZE_ARRAY_OES:
  95          var = &arrayObj->PointSize.Enabled;
  96          flag = _NEW_ARRAY_POINT_SIZE;
  97          break;
  98 #endif
  99
 100 #if FEATURE_NV_vertex_program
 101       case GL_VERTEX_ATTRIB_ARRAY0_NV:
 102       case GL_VERTEX_ATTRIB_ARRAY1_NV:
 103       case GL_VERTEX_ATTRIB_ARRAY2_NV:
 104       case GL_VERTEX_ATTRIB_ARRAY3_NV:
 105       case GL_VERTEX_ATTRIB_ARRAY4_NV:
 106       case GL_VERTEX_ATTRIB_ARRAY5_NV:
 107       case GL_VERTEX_ATTRIB_ARRAY6_NV:
 108       case GL_VERTEX_ATTRIB_ARRAY7_NV:
 109       case GL_VERTEX_ATTRIB_ARRAY8_NV:
 110       case GL_VERTEX_ATTRIB_ARRAY9_NV:
 111       case GL_VERTEX_ATTRIB_ARRAY10_NV:
 112       case GL_VERTEX_ATTRIB_ARRAY11_NV:
 113       case GL_VERTEX_ATTRIB_ARRAY12_NV:
 114       case GL_VERTEX_ATTRIB_ARRAY13_NV:
 115       case GL_VERTEX_ATTRIB_ARRAY14_NV:
 116       case GL_VERTEX_ATTRIB_ARRAY15_NV:
 117          CHECK_EXTENSION(NV_vertex_program, cap);
 118          {
 119             GLint n = (GLint) cap - GL_VERTEX_ATTRIB_ARRAY0_NV;
 120             ASSERT(n < Elements(ctx->Array.ArrayObj->VertexAttrib));
 121             var = &arrayObj->VertexAttrib[n].Enabled;
 122             flag = _NEW_ARRAY_ATTRIB(n);
 123          }
 124          break;
 125 #endif /* FEATURE_NV_vertex_program */
 126
 127       default:
 128          goto invalid_enum_error;
 129    }
 130
 131    if (*var == state)
 132       return;
 133
 134    FLUSH_VERTICES(ctx, _NEW_ARRAY);
 135    ctx->Array.NewState |= flag;
 136
 137    _ae_invalidate_state(ctx, _NEW_ARRAY);
 138
 139    *var = state;
 140
 141    if (state)
 142       ctx->Array.ArrayObj->_Enabled |= flag;
 143    else
 144       ctx->Array.ArrayObj->_Enabled &= ~flag;
 145
 146    if (ctx->Driver.Enable) {
 147       ctx->Driver.Enable( ctx, cap, state );
 148    }
 149
 150    return;
 151
 152 invalid_enum_error:
 153    _mesa_error(ctx, GL_INVALID_ENUM, "gl%sClientState(0x%x)",
 154                state ? "Enable" : "Disable", cap);
 155 }
 156
 157
 158 /**
 159  * Enable GL capability.
 160  * \param cap  state to enable/disable.
 161  *
 162  * Get's the current context, assures that we're outside glBegin()/glEnd() and
 163  * calls client_state().
 164  */
 165 void GLAPIENTRY
 166 _mesa_EnableClientState( GLenum cap )
 167 {
 168    GET_CURRENT_CONTEXT(ctx);
 169    ASSERT_OUTSIDE_BEGIN_END(ctx);
 170    client_state( ctx, cap, GL_TRUE );
 171 }
 172
 173
 174 /**
 175  * Disable GL capability.
 176  * \param cap  state to enable/disable.
 177  *
 178  * Get's the current context, assures that we're outside glBegin()/glEnd() and
 179  * calls client_state().
 180  */
 181 void GLAPIENTRY
 182 _mesa_DisableClientState( GLenum cap )
 183 {
 184    GET_CURRENT_CONTEXT(ctx);
 185    ASSERT_OUTSIDE_BEGIN_END(ctx);
 186    client_state( ctx, cap, GL_FALSE );
 187 }
 188
 189
 190 #undef CHECK_EXTENSION
 191 #define CHECK_EXTENSION(EXTNAME, CAP)                                   \
 192    if (!ctx->Extensions.EXTNAME) {                                      \
 193       goto invalid_enum_error;                                          \
 194    }
 195
 196 #define CHECK_EXTENSION2(EXT1, EXT2, CAP)                               \
 197    if (!ctx->Extensions.EXT1 && !ctx->Extensions.EXT2) {                \
 198       goto invalid_enum_error;                                          \
 199    }
 200
 201
 202
 203 /**
 204  * Return pointer to current texture unit for setting/getting coordinate
 205  * state.
 206  * Note that we'll set GL_INVALID_OPERATION if the active texture unit is
 207  * higher than the number of supported coordinate units.  And we'll return NULL.
 208  */
 209 static struct gl_texture_unit *
 210 get_texcoord_unit(GLcontext *ctx)
 211 {
 212    if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
 213       _mesa_error(ctx, GL_INVALID_OPERATION, "glEnable/Disable(texcoord unit)");
 214       return NULL;
 215    }
 216    else {
 217       return &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
 218    }
 219 }
 220
 221
 222 /**
 223  * Helper function to enable or disable a texture target.
 224  * \param bit  one of the TEXTURE_x_BIT values
 225  * \return GL_TRUE if state is changing or GL_FALSE if no change
 226  */
 227 static GLboolean
 228 enable_texture(GLcontext *ctx, GLboolean state, GLbitfield texBit)
 229 {
 230    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 231    const GLbitfield newenabled = state
 232       ? (texUnit->Enabled | texBit) : (texUnit->Enabled & ~texBit);
 233
 234    if (texUnit->Enabled == newenabled)
 235        return GL_FALSE;
 236
 237    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 238    texUnit->Enabled = newenabled;
 239    return GL_TRUE;
 240 }
 241
 242
 243 /**
 244  * Helper function to enable or disable state.
 245  *
 246  * \param ctx GL context.
 247  * \param cap  the state to enable/disable
 248  * \param state whether to enable or disable the specified capability.
 249  *
 250  * Updates the current context and flushes the vertices as needed. For
 251  * capabilities associated with extensions it verifies that those extensions
 252  * are effectivly present before updating. Notifies the driver via
 253  * dd_function_table::Enable.
 254  */
 255 void
 256 _mesa_set_enable(GLcontext *ctx, GLenum cap, GLboolean state)
 257 {
 258    if (MESA_VERBOSE & VERBOSE_API)
 259       _mesa_debug(ctx, "%s %s (newstate is %x)\n",
 260                   state ? "glEnable" : "glDisable",
 261                   _mesa_lookup_enum_by_nr(cap),
 262                   ctx->NewState);
 263
 264    switch (cap) {
 265       case GL_ALPHA_TEST:
 266          if (ctx->Color.AlphaEnabled == state)
 267             return;
 268          FLUSH_VERTICES(ctx, _NEW_COLOR);
 269          ctx->Color.AlphaEnabled = state;
 270          break;
 271       case GL_AUTO_NORMAL:
 272          if (ctx->Eval.AutoNormal == state)
 273             return;
 274          FLUSH_VERTICES(ctx, _NEW_EVAL);
 275          ctx->Eval.AutoNormal = state;
 276          break;
 277       case GL_BLEND:
 278          {
 279             GLbitfield newEnabled = state * ((1 << ctx->Const.MaxDrawBuffers) - 1);
 280             if (newEnabled != ctx->Color.BlendEnabled) {
 281                FLUSH_VERTICES(ctx, _NEW_COLOR);
 282                ctx->Color.BlendEnabled = newEnabled;
 283             }
 284          }
 285          break;
 286 #if FEATURE_userclip
 287       case GL_CLIP_PLANE0:
 288       case GL_CLIP_PLANE1:
 289       case GL_CLIP_PLANE2:
 290       case GL_CLIP_PLANE3:
 291       case GL_CLIP_PLANE4:
 292       case GL_CLIP_PLANE5:
 293          {
 294             const GLuint p = cap - GL_CLIP_PLANE0;
 295
 296             if ((ctx->Transform.ClipPlanesEnabled & (1 << p)) == ((GLuint) state << p))
 297                return;
 298
 299             FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 300
 301             if (state) {
 302                ctx->Transform.ClipPlanesEnabled |= (1 << p);
 303
 304                if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top))
 305                   _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
 306
 307                /* This derived state also calculated in clip.c and
 308                 * from _mesa_update_state() on changes to EyeUserPlane
 309                 * and ctx->ProjectionMatrix respectively.
 310                 */
 311                _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
 312                                     ctx->Transform.EyeUserPlane[p],
 313                                     ctx->ProjectionMatrixStack.Top->inv );
 314             }
 315             else {
 316                ctx->Transform.ClipPlanesEnabled &= ~(1 << p);
 317             }
 318          }
 319          break;
 320 #endif
 321       case GL_COLOR_MATERIAL:
 322          if (ctx->Light.ColorMaterialEnabled == state)
 323             return;
 324          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 325          FLUSH_CURRENT(ctx, 0);
 326          ctx->Light.ColorMaterialEnabled = state;
 327          if (state) {
 328             _mesa_update_color_material( ctx,
 329                                   ctx->Current.Attrib[VERT_ATTRIB_COLOR0] );
 330          }
 331          break;
 332       case GL_CULL_FACE:
 333          if (ctx->Polygon.CullFlag == state)
 334             return;
 335          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 336          ctx->Polygon.CullFlag = state;
 337          break;
 338       case GL_CULL_VERTEX_EXT:
 339          CHECK_EXTENSION(EXT_cull_vertex, cap);
 340          if (ctx->Transform.CullVertexFlag == state)
 341             return;
 342          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 343          ctx->Transform.CullVertexFlag = state;
 344          break;
 345       case GL_DEPTH_TEST:
 346          if (ctx->Depth.Test == state)
 347             return;
 348          FLUSH_VERTICES(ctx, _NEW_DEPTH);
 349          ctx->Depth.Test = state;
 350          break;
 351       case GL_DITHER:
 352          if (ctx->NoDither) {
 353             state = GL_FALSE; /* MESA_NO_DITHER env var */
 354          }
 355          if (ctx->Color.DitherFlag == state)
 356             return;
 357          FLUSH_VERTICES(ctx, _NEW_COLOR);
 358          ctx->Color.DitherFlag = state;
 359          break;
 360       case GL_FOG:
 361          if (ctx->Fog.Enabled == state)
 362             return;
 363          FLUSH_VERTICES(ctx, _NEW_FOG);
 364          ctx->Fog.Enabled = state;
 365          break;
 366       case GL_LIGHT0:
 367       case GL_LIGHT1:
 368       case GL_LIGHT2:
 369       case GL_LIGHT3:
 370       case GL_LIGHT4:
 371       case GL_LIGHT5:
 372       case GL_LIGHT6:
 373       case GL_LIGHT7:
 374          if (ctx->Light.Light[cap-GL_LIGHT0].Enabled == state)
 375             return;
 376          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 377          ctx->Light.Light[cap-GL_LIGHT0].Enabled = state;
 378          if (state) {
 379             insert_at_tail(&ctx->Light.EnabledList,
 380                            &ctx->Light.Light[cap-GL_LIGHT0]);
 381          }
 382          else {
 383             remove_from_list(&ctx->Light.Light[cap-GL_LIGHT0]);
 384          }
 385          break;
 386       case GL_LIGHTING:
 387          if (ctx->Light.Enabled == state)
 388             return;
 389          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 390          ctx->Light.Enabled = state;
 391          if (ctx->Light.Enabled && ctx->Light.Model.TwoSide)
 392             ctx->_TriangleCaps |= DD_TRI_LIGHT_TWOSIDE;
 393          else
 394             ctx->_TriangleCaps &= ~DD_TRI_LIGHT_TWOSIDE;
 395          break;
 396       case GL_LINE_SMOOTH:
 397          if (ctx->Line.SmoothFlag == state)
 398             return;
 399          FLUSH_VERTICES(ctx, _NEW_LINE);
 400          ctx->Line.SmoothFlag = state;
 401          ctx->_TriangleCaps ^= DD_LINE_SMOOTH;
 402          break;
 403       case GL_LINE_STIPPLE:
 404          if (ctx->Line.StippleFlag == state)
 405             return;
 406          FLUSH_VERTICES(ctx, _NEW_LINE);
 407          ctx->Line.StippleFlag = state;
 408          ctx->_TriangleCaps ^= DD_LINE_STIPPLE;
 409          break;
 410       case GL_INDEX_LOGIC_OP:
 411          if (ctx->Color.IndexLogicOpEnabled == state)
 412             return;
 413          FLUSH_VERTICES(ctx, _NEW_COLOR);
 414          ctx->Color.IndexLogicOpEnabled = state;
 415          break;
 416       case GL_COLOR_LOGIC_OP:
 417          if (ctx->Color.ColorLogicOpEnabled == state)
 418             return;
 419          FLUSH_VERTICES(ctx, _NEW_COLOR);
 420          ctx->Color.ColorLogicOpEnabled = state;
 421          break;
 422       case GL_MAP1_COLOR_4:
 423          if (ctx->Eval.Map1Color4 == state)
 424             return;
 425          FLUSH_VERTICES(ctx, _NEW_EVAL);
 426          ctx->Eval.Map1Color4 = state;
 427          break;
 428       case GL_MAP1_INDEX:
 429          if (ctx->Eval.Map1Index == state)
 430             return;
 431          FLUSH_VERTICES(ctx, _NEW_EVAL);
 432          ctx->Eval.Map1Index = state;
 433          break;
 434       case GL_MAP1_NORMAL:
 435          if (ctx->Eval.Map1Normal == state)
 436             return;
 437          FLUSH_VERTICES(ctx, _NEW_EVAL);
 438          ctx->Eval.Map1Normal = state;
 439          break;
 440       case GL_MAP1_TEXTURE_COORD_1:
 441          if (ctx->Eval.Map1TextureCoord1 == state)
 442             return;
 443          FLUSH_VERTICES(ctx, _NEW_EVAL);
 444          ctx->Eval.Map1TextureCoord1 = state;
 445          break;
 446       case GL_MAP1_TEXTURE_COORD_2:
 447          if (ctx->Eval.Map1TextureCoord2 == state)
 448             return;
 449          FLUSH_VERTICES(ctx, _NEW_EVAL);
 450          ctx->Eval.Map1TextureCoord2 = state;
 451          break;
 452       case GL_MAP1_TEXTURE_COORD_3:
 453          if (ctx->Eval.Map1TextureCoord3 == state)
 454             return;
 455          FLUSH_VERTICES(ctx, _NEW_EVAL);
 456          ctx->Eval.Map1TextureCoord3 = state;
 457          break;
 458       case GL_MAP1_TEXTURE_COORD_4:
 459          if (ctx->Eval.Map1TextureCoord4 == state)
 460             return;
 461          FLUSH_VERTICES(ctx, _NEW_EVAL);
 462          ctx->Eval.Map1TextureCoord4 = state;
 463          break;
 464       case GL_MAP1_VERTEX_3:
 465          if (ctx->Eval.Map1Vertex3 == state)
 466             return;
 467          FLUSH_VERTICES(ctx, _NEW_EVAL);
 468          ctx->Eval.Map1Vertex3 = state;
 469          break;
 470       case GL_MAP1_VERTEX_4:
 471          if (ctx->Eval.Map1Vertex4 == state)
 472             return;
 473          FLUSH_VERTICES(ctx, _NEW_EVAL);
 474          ctx->Eval.Map1Vertex4 = state;
 475          break;
 476       case GL_MAP2_COLOR_4:
 477          if (ctx->Eval.Map2Color4 == state)
 478             return;
 479          FLUSH_VERTICES(ctx, _NEW_EVAL);
 480          ctx->Eval.Map2Color4 = state;
 481          break;
 482       case GL_MAP2_INDEX:
 483          if (ctx->Eval.Map2Index == state)
 484             return;
 485          FLUSH_VERTICES(ctx, _NEW_EVAL);
 486          ctx->Eval.Map2Index = state;
 487          break;
 488       case GL_MAP2_NORMAL:
 489          if (ctx->Eval.Map2Normal == state)
 490             return;
 491          FLUSH_VERTICES(ctx, _NEW_EVAL);
 492          ctx->Eval.Map2Normal = state;
 493          break;
 494       case GL_MAP2_TEXTURE_COORD_1:
 495          if (ctx->Eval.Map2TextureCoord1 == state)
 496             return;
 497          FLUSH_VERTICES(ctx, _NEW_EVAL);
 498          ctx->Eval.Map2TextureCoord1 = state;
 499          break;
 500       case GL_MAP2_TEXTURE_COORD_2:
 501          if (ctx->Eval.Map2TextureCoord2 == state)
 502             return;
 503          FLUSH_VERTICES(ctx, _NEW_EVAL);
 504          ctx->Eval.Map2TextureCoord2 = state;
 505          break;
 506       case GL_MAP2_TEXTURE_COORD_3:
 507          if (ctx->Eval.Map2TextureCoord3 == state)
 508             return;
 509          FLUSH_VERTICES(ctx, _NEW_EVAL);
 510          ctx->Eval.Map2TextureCoord3 = state;
 511          break;
 512       case GL_MAP2_TEXTURE_COORD_4:
 513          if (ctx->Eval.Map2TextureCoord4 == state)
 514             return;
 515          FLUSH_VERTICES(ctx, _NEW_EVAL);
 516          ctx->Eval.Map2TextureCoord4 = state;
 517          break;
 518       case GL_MAP2_VERTEX_3:
 519          if (ctx->Eval.Map2Vertex3 == state)
 520             return;
 521          FLUSH_VERTICES(ctx, _NEW_EVAL);
 522          ctx->Eval.Map2Vertex3 = state;
 523          break;
 524       case GL_MAP2_VERTEX_4:
 525          if (ctx->Eval.Map2Vertex4 == state)
 526             return;
 527          FLUSH_VERTICES(ctx, _NEW_EVAL);
 528          ctx->Eval.Map2Vertex4 = state;
 529          break;
 530       case GL_NORMALIZE:
 531          if (ctx->Transform.Normalize == state)
 532             return;
 533          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 534          ctx->Transform.Normalize = state;
 535          break;
 536       case GL_POINT_SMOOTH:
 537          if (ctx->Point.SmoothFlag == state)
 538             return;
 539          FLUSH_VERTICES(ctx, _NEW_POINT);
 540          ctx->Point.SmoothFlag = state;
 541          ctx->_TriangleCaps ^= DD_POINT_SMOOTH;
 542          break;
 543       case GL_POLYGON_SMOOTH:
 544          if (ctx->Polygon.SmoothFlag == state)
 545             return;
 546          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 547          ctx->Polygon.SmoothFlag = state;
 548          ctx->_TriangleCaps ^= DD_TRI_SMOOTH;
 549          break;
 550       case GL_POLYGON_STIPPLE:
 551          if (ctx->Polygon.StippleFlag == state)
 552             return;
 553          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 554          ctx->Polygon.StippleFlag = state;
 555          ctx->_TriangleCaps ^= DD_TRI_STIPPLE;
 556          break;
 557       case GL_POLYGON_OFFSET_POINT:
 558          if (ctx->Polygon.OffsetPoint == state)
 559             return;
 560          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 561          ctx->Polygon.OffsetPoint = state;
 562          break;
 563       case GL_POLYGON_OFFSET_LINE:
 564          if (ctx->Polygon.OffsetLine == state)
 565             return;
 566          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 567          ctx->Polygon.OffsetLine = state;
 568          break;
 569       case GL_POLYGON_OFFSET_FILL:
 570          /*case GL_POLYGON_OFFSET_EXT:*/
 571          if (ctx->Polygon.OffsetFill == state)
 572             return;
 573          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 574          ctx->Polygon.OffsetFill = state;
 575          break;
 576       case GL_RESCALE_NORMAL_EXT:
 577          if (ctx->Transform.RescaleNormals == state)
 578             return;
 579          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 580          ctx->Transform.RescaleNormals = state;
 581          break;
 582       case GL_SCISSOR_TEST:
 583          if (ctx->Scissor.Enabled == state)
 584             return;
 585          FLUSH_VERTICES(ctx, _NEW_SCISSOR);
 586          ctx->Scissor.Enabled = state;
 587          break;
 588       case GL_SHARED_TEXTURE_PALETTE_EXT:
 589          if (ctx->Texture.SharedPalette == state)
 590             return;
 591          FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 592          ctx->Texture.SharedPalette = state;
 593          break;
 594       case GL_STENCIL_TEST:
 595          if (ctx->Stencil.Enabled == state)
 596             return;
 597          FLUSH_VERTICES(ctx, _NEW_STENCIL);
 598          ctx->Stencil.Enabled = state;
 599          break;
 600       case GL_TEXTURE_1D:
 601          if (!enable_texture(ctx, state, TEXTURE_1D_BIT)) {
 602             return;
 603          }
 604          break;
 605       case GL_TEXTURE_2D:
 606          if (!enable_texture(ctx, state, TEXTURE_2D_BIT)) {
 607             return;
 608          }
 609          break;
 610       case GL_TEXTURE_3D:
 611          if (!enable_texture(ctx, state, TEXTURE_3D_BIT)) {
 612             return;
 613          }
 614          break;
 615       case GL_TEXTURE_GEN_Q:
 616          {
 617             struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 618             if (texUnit) {
 619                GLuint newenabled = texUnit->TexGenEnabled & ~Q_BIT;
 620                if (state)
 621                   newenabled |= Q_BIT;
 622                if (texUnit->TexGenEnabled == newenabled)
 623                   return;
 624                FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 625                texUnit->TexGenEnabled = newenabled;
 626             }
 627          }
 628          break;
 629       case GL_TEXTURE_GEN_R:
 630          {
 631             struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 632             if (texUnit) {
 633                GLuint newenabled = texUnit->TexGenEnabled & ~R_BIT;
 634                if (state)
 635                   newenabled |= R_BIT;
 636                if (texUnit->TexGenEnabled == newenabled)
 637                   return;
 638                FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 639                texUnit->TexGenEnabled = newenabled;
 640             }
 641          }
 642          break;
 643       case GL_TEXTURE_GEN_S:
 644          {
 645             struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 646             if (texUnit) {
 647                GLuint newenabled = texUnit->TexGenEnabled & ~S_BIT;
 648                if (state)
 649                   newenabled |= S_BIT;
 650                if (texUnit->TexGenEnabled == newenabled)
 651                   return;
 652                FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 653                texUnit->TexGenEnabled = newenabled;
 654             }
 655          }
 656          break;
 657       case GL_TEXTURE_GEN_T:
 658          {
 659             struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 660             if (texUnit) {
 661                GLuint newenabled = texUnit->TexGenEnabled & ~T_BIT;
 662                if (state)
 663                   newenabled |= T_BIT;
 664                if (texUnit->TexGenEnabled == newenabled)
 665                   return;
 666                FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 667                texUnit->TexGenEnabled = newenabled;
 668             }
 669          }
 670          break;
 671
 672 #if FEATURE_ES1
 673       case GL_TEXTURE_GEN_STR_OES:
 674          /* disable S, T, and R at the same time */
 675          {
 676             struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 677             if (texUnit) {
 678                GLuint newenabled =
 679                   texUnit->TexGenEnabled & ~STR_BITS;
 680                if (state)
 681                   newenabled |= STR_BITS;
 682                if (texUnit->TexGenEnabled == newenabled)
 683                   return;
 684                FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 685                texUnit->TexGenEnabled = newenabled;
 686             }
 687          }
 688          break;
 689 #endif
 690
 691       /*
 692        * CLIENT STATE!!!
 693        */
 694       case GL_VERTEX_ARRAY:
 695       case GL_NORMAL_ARRAY:
 696       case GL_COLOR_ARRAY:
 697       case GL_INDEX_ARRAY:
 698       case GL_TEXTURE_COORD_ARRAY:
 699       case GL_EDGE_FLAG_ARRAY:
 700       case GL_FOG_COORDINATE_ARRAY_EXT:
 701       case GL_SECONDARY_COLOR_ARRAY_EXT:
 702       case GL_POINT_SIZE_ARRAY_OES:
 703          client_state( ctx, cap, state );
 704          return;
 705
 706       /* GL_SGI_texture_color_table */
 707       case GL_TEXTURE_COLOR_TABLE_SGI:
 708          CHECK_EXTENSION(SGI_texture_color_table, cap);
 709          if (ctx->Texture.Unit[ctx->Texture.CurrentUnit].ColorTableEnabled == state)
 710             return;
 711          FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 712          ctx->Texture.Unit[ctx->Texture.CurrentUnit].ColorTableEnabled = state;
 713          break;
 714
 715       /* GL_ARB_texture_cube_map */
 716       case GL_TEXTURE_CUBE_MAP_ARB:
 717          CHECK_EXTENSION(ARB_texture_cube_map, cap);
 718          if (!enable_texture(ctx, state, TEXTURE_CUBE_BIT)) {
 719             return;
 720          }
 721          break;
 722
 723       /* GL_EXT_secondary_color */
 724       case GL_COLOR_SUM_EXT:
 725          CHECK_EXTENSION2(EXT_secondary_color, ARB_vertex_program, cap);
 726          if (ctx->Fog.ColorSumEnabled == state)
 727             return;
 728          FLUSH_VERTICES(ctx, _NEW_FOG);
 729          ctx->Fog.ColorSumEnabled = state;
 730          break;
 731
 732       /* GL_ARB_multisample */
 733       case GL_MULTISAMPLE_ARB:
 734          if (ctx->Multisample.Enabled == state)
 735             return;
 736          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 737          ctx->Multisample.Enabled = state;
 738          break;
 739       case GL_SAMPLE_ALPHA_TO_COVERAGE_ARB:
 740          if (ctx->Multisample.SampleAlphaToCoverage == state)
 741             return;
 742          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 743          ctx->Multisample.SampleAlphaToCoverage = state;
 744          break;
 745       case GL_SAMPLE_ALPHA_TO_ONE_ARB:
 746          if (ctx->Multisample.SampleAlphaToOne == state)
 747             return;
 748          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 749          ctx->Multisample.SampleAlphaToOne = state;
 750          break;
 751       case GL_SAMPLE_COVERAGE_ARB:
 752          if (ctx->Multisample.SampleCoverage == state)
 753             return;
 754          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 755          ctx->Multisample.SampleCoverage = state;
 756          break;
 757       case GL_SAMPLE_COVERAGE_INVERT_ARB:
 758          if (ctx->Multisample.SampleCoverageInvert == state)
 759             return;
 760          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 761          ctx->Multisample.SampleCoverageInvert = state;
 762          break;
 763
 764       /* GL_IBM_rasterpos_clip */
 765       case GL_RASTER_POSITION_UNCLIPPED_IBM:
 766          CHECK_EXTENSION(IBM_rasterpos_clip, cap);
 767          if (ctx->Transform.RasterPositionUnclipped == state)
 768             return;
 769          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 770          ctx->Transform.RasterPositionUnclipped = state;
 771          break;
 772
 773       /* GL_NV_point_sprite */
 774       case GL_POINT_SPRITE_NV:
 775          CHECK_EXTENSION2(NV_point_sprite, ARB_point_sprite, cap);
 776          if (ctx->Point.PointSprite == state)
 777             return;
 778          FLUSH_VERTICES(ctx, _NEW_POINT);
 779          ctx->Point.PointSprite = state;
 780          break;
 781
 782 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
 783       case GL_VERTEX_PROGRAM_ARB:
 784          CHECK_EXTENSION2(ARB_vertex_program, NV_vertex_program, cap);
 785          if (ctx->VertexProgram.Enabled == state)
 786             return;
 787          FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 788          ctx->VertexProgram.Enabled = state;
 789          break;
 790       case GL_VERTEX_PROGRAM_POINT_SIZE_ARB:
 791          CHECK_EXTENSION2(ARB_vertex_program, NV_vertex_program, cap);
 792          if (ctx->VertexProgram.PointSizeEnabled == state)
 793             return;
 794          FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 795          ctx->VertexProgram.PointSizeEnabled = state;
 796          break;
 797       case GL_VERTEX_PROGRAM_TWO_SIDE_ARB:
 798          CHECK_EXTENSION2(ARB_vertex_program, NV_vertex_program, cap);
 799          if (ctx->VertexProgram.TwoSideEnabled == state)
 800             return;
 801          FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 802          ctx->VertexProgram.TwoSideEnabled = state;
 803          break;
 804 #endif
 805 #if FEATURE_NV_vertex_program
 806       case GL_MAP1_VERTEX_ATTRIB0_4_NV:
 807       case GL_MAP1_VERTEX_ATTRIB1_4_NV:
 808       case GL_MAP1_VERTEX_ATTRIB2_4_NV:
 809       case GL_MAP1_VERTEX_ATTRIB3_4_NV:
 810       case GL_MAP1_VERTEX_ATTRIB4_4_NV:
 811       case GL_MAP1_VERTEX_ATTRIB5_4_NV:
 812       case GL_MAP1_VERTEX_ATTRIB6_4_NV:
 813       case GL_MAP1_VERTEX_ATTRIB7_4_NV:
 814       case GL_MAP1_VERTEX_ATTRIB8_4_NV:
 815       case GL_MAP1_VERTEX_ATTRIB9_4_NV:
 816       case GL_MAP1_VERTEX_ATTRIB10_4_NV:
 817       case GL_MAP1_VERTEX_ATTRIB11_4_NV:
 818       case GL_MAP1_VERTEX_ATTRIB12_4_NV:
 819       case GL_MAP1_VERTEX_ATTRIB13_4_NV:
 820       case GL_MAP1_VERTEX_ATTRIB14_4_NV:
 821       case GL_MAP1_VERTEX_ATTRIB15_4_NV:
 822          CHECK_EXTENSION(NV_vertex_program, cap);
 823          {
 824             const GLuint map = (GLuint) (cap - GL_MAP1_VERTEX_ATTRIB0_4_NV);
 825             FLUSH_VERTICES(ctx, _NEW_EVAL);
 826             ctx->Eval.Map1Attrib[map] = state;
 827          }
 828          break;
 829       case GL_MAP2_VERTEX_ATTRIB0_4_NV:
 830       case GL_MAP2_VERTEX_ATTRIB1_4_NV:
 831       case GL_MAP2_VERTEX_ATTRIB2_4_NV:
 832       case GL_MAP2_VERTEX_ATTRIB3_4_NV:
 833       case GL_MAP2_VERTEX_ATTRIB4_4_NV:
 834       case GL_MAP2_VERTEX_ATTRIB5_4_NV:
 835       case GL_MAP2_VERTEX_ATTRIB6_4_NV:
 836       case GL_MAP2_VERTEX_ATTRIB7_4_NV:
 837       case GL_MAP2_VERTEX_ATTRIB8_4_NV:
 838       case GL_MAP2_VERTEX_ATTRIB9_4_NV:
 839       case GL_MAP2_VERTEX_ATTRIB10_4_NV:
 840       case GL_MAP2_VERTEX_ATTRIB11_4_NV:
 841       case GL_MAP2_VERTEX_ATTRIB12_4_NV:
 842       case GL_MAP2_VERTEX_ATTRIB13_4_NV:
 843       case GL_MAP2_VERTEX_ATTRIB14_4_NV:
 844       case GL_MAP2_VERTEX_ATTRIB15_4_NV:
 845          CHECK_EXTENSION(NV_vertex_program, cap);
 846          {
 847             const GLuint map = (GLuint) (cap - GL_MAP2_VERTEX_ATTRIB0_4_NV);
 848             FLUSH_VERTICES(ctx, _NEW_EVAL);
 849             ctx->Eval.Map2Attrib[map] = state;
 850          }
 851          break;
 852 #endif /* FEATURE_NV_vertex_program */
 853
 854 #if FEATURE_NV_fragment_program
 855       case GL_FRAGMENT_PROGRAM_NV:
 856          CHECK_EXTENSION(NV_fragment_program, cap);
 857          if (ctx->FragmentProgram.Enabled == state)
 858             return;
 859          FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 860          ctx->FragmentProgram.Enabled = state;
 861          break;
 862 #endif /* FEATURE_NV_fragment_program */
 863
 864       /* GL_NV_texture_rectangle */
 865       case GL_TEXTURE_RECTANGLE_NV:
 866          CHECK_EXTENSION(NV_texture_rectangle, cap);
 867          if (!enable_texture(ctx, state, TEXTURE_RECT_BIT)) {
 868             return;
 869          }
 870          break;
 871
 872       /* GL_EXT_stencil_two_side */
 873       case GL_STENCIL_TEST_TWO_SIDE_EXT:
 874          CHECK_EXTENSION(EXT_stencil_two_side, cap);
 875          if (ctx->Stencil.TestTwoSide == state)
 876             return;
 877          FLUSH_VERTICES(ctx, _NEW_STENCIL);
 878          ctx->Stencil.TestTwoSide = state;
 879          if (state) {
 880             ctx->Stencil._BackFace = 2;
 881             ctx->_TriangleCaps |= DD_TRI_TWOSTENCIL;
 882          } else {
 883             ctx->Stencil._BackFace = 1;
 884             ctx->_TriangleCaps &= ~DD_TRI_TWOSTENCIL;
 885          }
 886          break;
 887
 888 #if FEATURE_ARB_fragment_program
 889       case GL_FRAGMENT_PROGRAM_ARB:
 890          CHECK_EXTENSION(ARB_fragment_program, cap);
 891          if (ctx->FragmentProgram.Enabled == state)
 892             return;
 893          FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 894          ctx->FragmentProgram.Enabled = state;
 895          break;
 896 #endif /* FEATURE_ARB_fragment_program */
 897
 898       /* GL_EXT_depth_bounds_test */
 899       case GL_DEPTH_BOUNDS_TEST_EXT:
 900          CHECK_EXTENSION(EXT_depth_bounds_test, cap);
 901          if (ctx->Depth.BoundsTest == state)
 902             return;
 903          FLUSH_VERTICES(ctx, _NEW_DEPTH);
 904          ctx->Depth.BoundsTest = state;
 905          break;
 906
 907       case GL_DEPTH_CLAMP:
 908          if (ctx->Transform.DepthClamp == state)
 909             return;
 910          CHECK_EXTENSION(ARB_depth_clamp, cap);
 911          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 912          ctx->Transform.DepthClamp = state;
 913          break;
 914
 915 #if FEATURE_ATI_fragment_shader
 916       case GL_FRAGMENT_SHADER_ATI:
 917         CHECK_EXTENSION(ATI_fragment_shader, cap);
 918         if (ctx->ATIFragmentShader.Enabled == state)
 919           return;
 920         FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 921         ctx->ATIFragmentShader.Enabled = state;
 922         break;
 923 #endif
 924
 925       /* GL_MESA_texture_array */
 926       case GL_TEXTURE_1D_ARRAY_EXT:
 927          CHECK_EXTENSION(MESA_texture_array, cap);
 928          if (!enable_texture(ctx, state, TEXTURE_1D_ARRAY_BIT)) {
 929             return;
 930          }
 931          break;
 932
 933       case GL_TEXTURE_2D_ARRAY_EXT:
 934          CHECK_EXTENSION(MESA_texture_array, cap);
 935          if (!enable_texture(ctx, state, TEXTURE_2D_ARRAY_BIT)) {
 936             return;
 937          }
 938          break;
 939
 940       case GL_TEXTURE_CUBE_MAP_SEAMLESS:
 941          CHECK_EXTENSION(ARB_seamless_cube_map, cap);
 942          ctx->Texture.CubeMapSeamless = state;
 943          break;
 944
 945 #if FEATURE_EXT_transform_feedback
 946       case GL_RASTERIZER_DISCARD:
 947          CHECK_EXTENSION(EXT_transform_feedback, cap);
 948          if (ctx->TransformFeedback.RasterDiscard != state) {
 949             ctx->TransformFeedback.RasterDiscard = state;
 950             FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 951          }
 952          break;
 953 #endif
 954
 955       /* GL 3.1 primitive restart */
 956       case GL_PRIMITIVE_RESTART:
 957          if (ctx->VersionMajor * 10 + ctx->VersionMinor < 31) {
 958             goto invalid_enum_error;
 959          }
 960          if (ctx->Array.PrimitiveRestart != state) {
 961             FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 962             ctx->Array.PrimitiveRestart = state;
 963          }
 964          break;
 965
 966       default:
 967          goto invalid_enum_error;
 968    }
 969
 970    if (ctx->Driver.Enable) {
 971       ctx->Driver.Enable( ctx, cap, state );
 972    }
 973
 974    return;
 975
 976 invalid_enum_error:
 977    _mesa_error(ctx, GL_INVALID_ENUM, "gl%s(0x%x)",
 978                state ? "Enable" : "Disable", cap);
 979 }
 980
 981
 982 /**
 983  * Enable GL capability.  Called by glEnable()
 984  * \param cap  state to enable.
 985  */
 986 void GLAPIENTRY
 987 _mesa_Enable( GLenum cap )
 988 {
 989    GET_CURRENT_CONTEXT(ctx);
 990    ASSERT_OUTSIDE_BEGIN_END(ctx);
 991
 992    _mesa_set_enable( ctx, cap, GL_TRUE );
 993 }
 994
 995
 996 /**
 997  * Disable GL capability.  Called by glDisable()
 998  * \param cap  state to disable.
 999  */
1000 void GLAPIENTRY
1001 _mesa_Disable( GLenum cap )
1002 {
1003    GET_CURRENT_CONTEXT(ctx);
1004    ASSERT_OUTSIDE_BEGIN_END(ctx);
1005
1006    _mesa_set_enable( ctx, cap, GL_FALSE );
1007 }
1008
1009
1010
1011 /**
1012  * Enable/disable an indexed state var.
1013  */
1014 void
1015 _mesa_set_enablei(GLcontext *ctx, GLenum cap, GLuint index, GLboolean state)
1016 {
1017    ASSERT(state == 0 || state == 1);
1018    switch (cap) {
1019    case GL_BLEND:
1020       if (!ctx->Extensions.EXT_draw_buffers2) {
1021          goto invalid_enum_error;
1022       }
1023       if (index >= ctx->Const.MaxDrawBuffers) {
1024          _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%u)",
1025                      state ? "glEnableIndexed" : "glDisableIndexed", index);
1026          return;
1027       }
1028       if (((ctx->Color.BlendEnabled >> index) & 1) != state) {
1029          FLUSH_VERTICES(ctx, _NEW_COLOR);
1030          if (state)
1031             ctx->Color.BlendEnabled |= (1 << index);
1032          else
1033             ctx->Color.BlendEnabled &= ~(1 << index);
1034       }
1035       break;
1036    default:
1037       goto invalid_enum_error;
1038    }
1039    return;
1040
1041 invalid_enum_error:
1042     _mesa_error(ctx, GL_INVALID_ENUM, "%s(cap=%s)",
1043                 state ? "glEnablei" : "glDisablei",
1044                 _mesa_lookup_enum_by_nr(cap));
1045 }
1046
1047
1048 void GLAPIENTRY
1049 _mesa_DisableIndexed( GLenum cap, GLuint index )
1050 {
1051    GET_CURRENT_CONTEXT(ctx);
1052    ASSERT_OUTSIDE_BEGIN_END(ctx);
1053    _mesa_set_enablei(ctx, cap, index, GL_FALSE);
1054 }
1055
1056
1057 void GLAPIENTRY
1058 _mesa_EnableIndexed( GLenum cap, GLuint index )
1059 {
1060    GET_CURRENT_CONTEXT(ctx);
1061    ASSERT_OUTSIDE_BEGIN_END(ctx);
1062    _mesa_set_enablei(ctx, cap, index, GL_TRUE);
1063 }
1064
1065
1066 GLboolean GLAPIENTRY
1067 _mesa_IsEnabledIndexed( GLenum cap, GLuint index )
1068 {
1069    GET_CURRENT_CONTEXT(ctx);
1070    switch (cap) {
1071    case GL_BLEND:
1072       if (index >= ctx->Const.MaxDrawBuffers) {
1073          _mesa_error(ctx, GL_INVALID_VALUE, "glIsEnabledIndexed(index=%u)",
1074                      index);
1075          return GL_FALSE;
1076       }
1077       return (ctx->Color.BlendEnabled >> index) & 1;
1078    default:
1079       _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabledIndexed(cap=%s)",
1080                   _mesa_lookup_enum_by_nr(cap));
1081       return GL_FALSE;
1082    }
1083 }
1084
1085
1086
1087
1088 #undef CHECK_EXTENSION
1089 #define CHECK_EXTENSION(EXTNAME)                        \
1090    if (!ctx->Extensions.EXTNAME) {                      \
1091       goto invalid_enum_error;                          \
1092    }
1093
1094 #undef CHECK_EXTENSION2
1095 #define CHECK_EXTENSION2(EXT1, EXT2)                            \
1096    if (!ctx->Extensions.EXT1 && !ctx->Extensions.EXT2) {        \
1097       goto invalid_enum_error;                                  \
1098    }
1099
1100
1101 /**
1102  * Helper function to determine whether a texture target is enabled.
1103  */
1104 static GLboolean
1105 is_texture_enabled(GLcontext *ctx, GLbitfield bit)
1106 {
1107    const struct gl_texture_unit *const texUnit =
1108        &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
1109    return (texUnit->Enabled & bit) ? GL_TRUE : GL_FALSE;
1110 }
1111
1112
1113 /**
1114  * Return simple enable/disable state.
1115  *
1116  * \param cap  state variable to query.
1117  *
1118  * Returns the state of the specified capability from the current GL context.
1119  * For the capabilities associated with extensions verifies that those
1120  * extensions are effectively present before reporting.
1121  */
1122 GLboolean GLAPIENTRY
1123 _mesa_IsEnabled( GLenum cap )
1124 {
1125    GET_CURRENT_CONTEXT(ctx);
1126    switch (cap) {
1127       case GL_ALPHA_TEST:
1128          return ctx->Color.AlphaEnabled;
1129       case GL_AUTO_NORMAL:
1130          return ctx->Eval.AutoNormal;
1131       case GL_BLEND:
1132          return ctx->Color.BlendEnabled & 1;  /* return state for buffer[0] */
1133       case GL_CLIP_PLANE0:
1134       case GL_CLIP_PLANE1:
1135       case GL_CLIP_PLANE2:
1136       case GL_CLIP_PLANE3:
1137       case GL_CLIP_PLANE4:
1138       case GL_CLIP_PLANE5:
1139          return (ctx->Transform.ClipPlanesEnabled >> (cap - GL_CLIP_PLANE0)) & 1;
1140       case GL_COLOR_MATERIAL:
1141          return ctx->Light.ColorMaterialEnabled;
1142       case GL_CULL_FACE:
1143          return ctx->Polygon.CullFlag;
1144       case GL_DEPTH_TEST:
1145          return ctx->Depth.Test;
1146       case GL_DITHER:
1147          return ctx->Color.DitherFlag;
1148       case GL_FOG:
1149          return ctx->Fog.Enabled;
1150       case GL_LIGHTING:
1151          return ctx->Light.Enabled;
1152       case GL_LIGHT0:
1153       case GL_LIGHT1:
1154       case GL_LIGHT2:
1155       case GL_LIGHT3:
1156       case GL_LIGHT4:
1157       case GL_LIGHT5:
1158       case GL_LIGHT6:
1159       case GL_LIGHT7:
1160          return ctx->Light.Light[cap-GL_LIGHT0].Enabled;
1161       case GL_LINE_SMOOTH:
1162          return ctx->Line.SmoothFlag;
1163       case GL_LINE_STIPPLE:
1164          return ctx->Line.StippleFlag;
1165       case GL_INDEX_LOGIC_OP:
1166          return ctx->Color.IndexLogicOpEnabled;
1167       case GL_COLOR_LOGIC_OP:
1168          return ctx->Color.ColorLogicOpEnabled;
1169       case GL_MAP1_COLOR_4:
1170          return ctx->Eval.Map1Color4;
1171       case GL_MAP1_INDEX:
1172          return ctx->Eval.Map1Index;
1173       case GL_MAP1_NORMAL:
1174          return ctx->Eval.Map1Normal;
1175       case GL_MAP1_TEXTURE_COORD_1:
1176          return ctx->Eval.Map1TextureCoord1;
1177       case GL_MAP1_TEXTURE_COORD_2:
1178          return ctx->Eval.Map1TextureCoord2;
1179       case GL_MAP1_TEXTURE_COORD_3:
1180          return ctx->Eval.Map1TextureCoord3;
1181       case GL_MAP1_TEXTURE_COORD_4:
1182          return ctx->Eval.Map1TextureCoord4;
1183       case GL_MAP1_VERTEX_3:
1184          return ctx->Eval.Map1Vertex3;
1185       case GL_MAP1_VERTEX_4:
1186          return ctx->Eval.Map1Vertex4;
1187       case GL_MAP2_COLOR_4:
1188          return ctx->Eval.Map2Color4;
1189       case GL_MAP2_INDEX:
1190          return ctx->Eval.Map2Index;
1191       case GL_MAP2_NORMAL:
1192          return ctx->Eval.Map2Normal;
1193       case GL_MAP2_TEXTURE_COORD_1:
1194          return ctx->Eval.Map2TextureCoord1;
1195       case GL_MAP2_TEXTURE_COORD_2:
1196          return ctx->Eval.Map2TextureCoord2;
1197       case GL_MAP2_TEXTURE_COORD_3:
1198          return ctx->Eval.Map2TextureCoord3;
1199       case GL_MAP2_TEXTURE_COORD_4:
1200          return ctx->Eval.Map2TextureCoord4;
1201       case GL_MAP2_VERTEX_3:
1202          return ctx->Eval.Map2Vertex3;
1203       case GL_MAP2_VERTEX_4:
1204          return ctx->Eval.Map2Vertex4;
1205       case GL_NORMALIZE:
1206          return ctx->Transform.Normalize;
1207       case GL_POINT_SMOOTH:
1208          return ctx->Point.SmoothFlag;
1209       case GL_POLYGON_SMOOTH:
1210          return ctx->Polygon.SmoothFlag;
1211       case GL_POLYGON_STIPPLE:
1212          return ctx->Polygon.StippleFlag;
1213       case GL_POLYGON_OFFSET_POINT:
1214          return ctx->Polygon.OffsetPoint;
1215       case GL_POLYGON_OFFSET_LINE:
1216          return ctx->Polygon.OffsetLine;
1217       case GL_POLYGON_OFFSET_FILL:
1218       /*case GL_POLYGON_OFFSET_EXT:*/
1219          return ctx->Polygon.OffsetFill;
1220       case GL_RESCALE_NORMAL_EXT:
1221          return ctx->Transform.RescaleNormals;
1222       case GL_SCISSOR_TEST:
1223          return ctx->Scissor.Enabled;
1224       case GL_SHARED_TEXTURE_PALETTE_EXT:
1225          return ctx->Texture.SharedPalette;
1226       case GL_STENCIL_TEST:
1227          return ctx->Stencil.Enabled;
1228       case GL_TEXTURE_1D:
1229          return is_texture_enabled(ctx, TEXTURE_1D_BIT);
1230       case GL_TEXTURE_2D:
1231          return is_texture_enabled(ctx, TEXTURE_2D_BIT);
1232       case GL_TEXTURE_3D:
1233          return is_texture_enabled(ctx, TEXTURE_3D_BIT);
1234       case GL_TEXTURE_GEN_Q:
1235          {
1236             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1237             if (texUnit) {
1238                return (texUnit->TexGenEnabled & Q_BIT) ? GL_TRUE : GL_FALSE;
1239             }
1240          }
1241          return GL_FALSE;
1242       case GL_TEXTURE_GEN_R:
1243          {
1244             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1245             if (texUnit) {
1246                return (texUnit->TexGenEnabled & R_BIT) ? GL_TRUE : GL_FALSE;
1247             }
1248          }
1249          return GL_FALSE;
1250       case GL_TEXTURE_GEN_S:
1251          {
1252             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1253             if (texUnit) {
1254                return (texUnit->TexGenEnabled & S_BIT) ? GL_TRUE : GL_FALSE;
1255             }
1256          }
1257          return GL_FALSE;
1258       case GL_TEXTURE_GEN_T:
1259          {
1260             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1261             if (texUnit) {
1262                return (texUnit->TexGenEnabled & T_BIT) ? GL_TRUE : GL_FALSE;
1263             }
1264          }
1265          return GL_FALSE;
1266 #if FEATURE_ES1
1267       case GL_TEXTURE_GEN_STR_OES:
1268          {
1269             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1270             if (texUnit) {
1271                     return (texUnit->TexGenEnabled & STR_BITS) == STR_BITS ? GL_TRUE : GL_FALSE;
1272             }
1273          }
1274 #endif
1275
1276       /*
1277        * CLIENT STATE!!!
1278        */
1279       case GL_VERTEX_ARRAY:
1280          return (ctx->Array.ArrayObj->Vertex.Enabled != 0);
1281       case GL_NORMAL_ARRAY:
1282          return (ctx->Array.ArrayObj->Normal.Enabled != 0);
1283       case GL_COLOR_ARRAY:
1284          return (ctx->Array.ArrayObj->Color.Enabled != 0);
1285       case GL_INDEX_ARRAY:
1286          return (ctx->Array.ArrayObj->Index.Enabled != 0);
1287       case GL_TEXTURE_COORD_ARRAY:
1288          return (ctx->Array.ArrayObj->TexCoord[ctx->Array.ActiveTexture].Enabled != 0);
1289       case GL_EDGE_FLAG_ARRAY:
1290          return (ctx->Array.ArrayObj->EdgeFlag.Enabled != 0);
1291       case GL_FOG_COORDINATE_ARRAY_EXT:
1292          CHECK_EXTENSION(EXT_fog_coord);
1293          return (ctx->Array.ArrayObj->FogCoord.Enabled != 0);
1294       case GL_SECONDARY_COLOR_ARRAY_EXT:
1295          CHECK_EXTENSION(EXT_secondary_color);
1296          return (ctx->Array.ArrayObj->SecondaryColor.Enabled != 0);
1297 #if FEATURE_point_size_array
1298       case GL_POINT_SIZE_ARRAY_OES:
1299          return (ctx->Array.ArrayObj->PointSize.Enabled != 0);
1300 #endif
1301
1302       /* GL_SGI_texture_color_table */
1303       case GL_TEXTURE_COLOR_TABLE_SGI:
1304          CHECK_EXTENSION(SGI_texture_color_table);
1305          return ctx->Texture.Unit[ctx->Texture.CurrentUnit].ColorTableEnabled;
1306
1307       /* GL_ARB_texture_cube_map */
1308       case GL_TEXTURE_CUBE_MAP_ARB:
1309          CHECK_EXTENSION(ARB_texture_cube_map);
1310          return is_texture_enabled(ctx, TEXTURE_CUBE_BIT);
1311
1312       /* GL_EXT_secondary_color */
1313       case GL_COLOR_SUM_EXT:
1314          CHECK_EXTENSION2(EXT_secondary_color, ARB_vertex_program);
1315          return ctx->Fog.ColorSumEnabled;
1316
1317       /* GL_ARB_multisample */
1318       case GL_MULTISAMPLE_ARB:
1319          return ctx->Multisample.Enabled;
1320       case GL_SAMPLE_ALPHA_TO_COVERAGE_ARB:
1321          return ctx->Multisample.SampleAlphaToCoverage;
1322       case GL_SAMPLE_ALPHA_TO_ONE_ARB:
1323          return ctx->Multisample.SampleAlphaToOne;
1324       case GL_SAMPLE_COVERAGE_ARB:
1325          return ctx->Multisample.SampleCoverage;
1326       case GL_SAMPLE_COVERAGE_INVERT_ARB:
1327          return ctx->Multisample.SampleCoverageInvert;
1328
1329       /* GL_IBM_rasterpos_clip */
1330       case GL_RASTER_POSITION_UNCLIPPED_IBM:
1331          CHECK_EXTENSION(IBM_rasterpos_clip);
1332          return ctx->Transform.RasterPositionUnclipped;
1333
1334       /* GL_NV_point_sprite */
1335       case GL_POINT_SPRITE_NV:
1336          CHECK_EXTENSION2(NV_point_sprite, ARB_point_sprite)
1337          return ctx->Point.PointSprite;
1338
1339 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
1340       case GL_VERTEX_PROGRAM_ARB:
1341          CHECK_EXTENSION2(ARB_vertex_program, NV_vertex_program);
1342          return ctx->VertexProgram.Enabled;
1343       case GL_VERTEX_PROGRAM_POINT_SIZE_ARB:
1344          CHECK_EXTENSION2(ARB_vertex_program, NV_vertex_program);
1345          return ctx->VertexProgram.PointSizeEnabled;
1346       case GL_VERTEX_PROGRAM_TWO_SIDE_ARB:
1347          CHECK_EXTENSION2(ARB_vertex_program, NV_vertex_program);
1348          return ctx->VertexProgram.TwoSideEnabled;
1349 #endif
1350 #if FEATURE_NV_vertex_program
1351       case GL_VERTEX_ATTRIB_ARRAY0_NV:
1352       case GL_VERTEX_ATTRIB_ARRAY1_NV:
1353       case GL_VERTEX_ATTRIB_ARRAY2_NV:
1354       case GL_VERTEX_ATTRIB_ARRAY3_NV:
1355       case GL_VERTEX_ATTRIB_ARRAY4_NV:
1356       case GL_VERTEX_ATTRIB_ARRAY5_NV:
1357       case GL_VERTEX_ATTRIB_ARRAY6_NV:
1358       case GL_VERTEX_ATTRIB_ARRAY7_NV:
1359       case GL_VERTEX_ATTRIB_ARRAY8_NV:
1360       case GL_VERTEX_ATTRIB_ARRAY9_NV:
1361       case GL_VERTEX_ATTRIB_ARRAY10_NV:
1362       case GL_VERTEX_ATTRIB_ARRAY11_NV:
1363       case GL_VERTEX_ATTRIB_ARRAY12_NV:
1364       case GL_VERTEX_ATTRIB_ARRAY13_NV:
1365       case GL_VERTEX_ATTRIB_ARRAY14_NV:
1366       case GL_VERTEX_ATTRIB_ARRAY15_NV:
1367          CHECK_EXTENSION(NV_vertex_program);
1368          {
1369             GLint n = (GLint) cap - GL_VERTEX_ATTRIB_ARRAY0_NV;
1370             ASSERT(n < Elements(ctx->Array.ArrayObj->VertexAttrib));
1371             return (ctx->Array.ArrayObj->VertexAttrib[n].Enabled != 0);
1372          }
1373       case GL_MAP1_VERTEX_ATTRIB0_4_NV:
1374       case GL_MAP1_VERTEX_ATTRIB1_4_NV:
1375       case GL_MAP1_VERTEX_ATTRIB2_4_NV:
1376       case GL_MAP1_VERTEX_ATTRIB3_4_NV:
1377       case GL_MAP1_VERTEX_ATTRIB4_4_NV:
1378       case GL_MAP1_VERTEX_ATTRIB5_4_NV:
1379       case GL_MAP1_VERTEX_ATTRIB6_4_NV:
1380       case GL_MAP1_VERTEX_ATTRIB7_4_NV:
1381       case GL_MAP1_VERTEX_ATTRIB8_4_NV:
1382       case GL_MAP1_VERTEX_ATTRIB9_4_NV:
1383       case GL_MAP1_VERTEX_ATTRIB10_4_NV:
1384       case GL_MAP1_VERTEX_ATTRIB11_4_NV:
1385       case GL_MAP1_VERTEX_ATTRIB12_4_NV:
1386       case GL_MAP1_VERTEX_ATTRIB13_4_NV:
1387       case GL_MAP1_VERTEX_ATTRIB14_4_NV:
1388       case GL_MAP1_VERTEX_ATTRIB15_4_NV:
1389          CHECK_EXTENSION(NV_vertex_program);
1390          {
1391             const GLuint map = (GLuint) (cap - GL_MAP1_VERTEX_ATTRIB0_4_NV);
1392             return ctx->Eval.Map1Attrib[map];
1393          }
1394       case GL_MAP2_VERTEX_ATTRIB0_4_NV:
1395       case GL_MAP2_VERTEX_ATTRIB1_4_NV:
1396       case GL_MAP2_VERTEX_ATTRIB2_4_NV:
1397       case GL_MAP2_VERTEX_ATTRIB3_4_NV:
1398       case GL_MAP2_VERTEX_ATTRIB4_4_NV:
1399       case GL_MAP2_VERTEX_ATTRIB5_4_NV:
1400       case GL_MAP2_VERTEX_ATTRIB6_4_NV:
1401       case GL_MAP2_VERTEX_ATTRIB7_4_NV:
1402       case GL_MAP2_VERTEX_ATTRIB8_4_NV:
1403       case GL_MAP2_VERTEX_ATTRIB9_4_NV:
1404       case GL_MAP2_VERTEX_ATTRIB10_4_NV:
1405       case GL_MAP2_VERTEX_ATTRIB11_4_NV:
1406       case GL_MAP2_VERTEX_ATTRIB12_4_NV:
1407       case GL_MAP2_VERTEX_ATTRIB13_4_NV:
1408       case GL_MAP2_VERTEX_ATTRIB14_4_NV:
1409       case GL_MAP2_VERTEX_ATTRIB15_4_NV:
1410          CHECK_EXTENSION(NV_vertex_program);
1411          {
1412             const GLuint map = (GLuint) (cap - GL_MAP2_VERTEX_ATTRIB0_4_NV);
1413             return ctx->Eval.Map2Attrib[map];
1414          }
1415 #endif /* FEATURE_NV_vertex_program */
1416
1417 #if FEATURE_NV_fragment_program
1418       case GL_FRAGMENT_PROGRAM_NV:
1419          CHECK_EXTENSION(NV_fragment_program);
1420          return ctx->FragmentProgram.Enabled;
1421 #endif /* FEATURE_NV_fragment_program */
1422
1423       /* GL_NV_texture_rectangle */
1424       case GL_TEXTURE_RECTANGLE_NV:
1425          CHECK_EXTENSION(NV_texture_rectangle);
1426          return is_texture_enabled(ctx, TEXTURE_RECT_BIT);
1427
1428       /* GL_EXT_stencil_two_side */
1429       case GL_STENCIL_TEST_TWO_SIDE_EXT:
1430          CHECK_EXTENSION(EXT_stencil_two_side);
1431          return ctx->Stencil.TestTwoSide;
1432
1433 #if FEATURE_ARB_fragment_program
1434       case GL_FRAGMENT_PROGRAM_ARB:
1435          return ctx->FragmentProgram.Enabled;
1436 #endif /* FEATURE_ARB_fragment_program */
1437
1438       /* GL_EXT_depth_bounds_test */
1439       case GL_DEPTH_BOUNDS_TEST_EXT:
1440          CHECK_EXTENSION(EXT_depth_bounds_test);
1441          return ctx->Depth.BoundsTest;
1442
1443       /* GL_ARB_depth_clamp */
1444       case GL_DEPTH_CLAMP:
1445          CHECK_EXTENSION(ARB_depth_clamp);
1446          return ctx->Transform.DepthClamp;
1447
1448 #if FEATURE_ATI_fragment_shader
1449       case GL_FRAGMENT_SHADER_ATI:
1450          CHECK_EXTENSION(ATI_fragment_shader);
1451          return ctx->ATIFragmentShader.Enabled;
1452 #endif /* FEATURE_ATI_fragment_shader */
1453
1454       case GL_TEXTURE_CUBE_MAP_SEAMLESS:
1455          CHECK_EXTENSION(ARB_seamless_cube_map);
1456          return ctx->Texture.CubeMapSeamless;
1457
1458 #if FEATURE_EXT_transform_feedback
1459       case GL_RASTERIZER_DISCARD:
1460          CHECK_EXTENSION(EXT_transform_feedback);
1461          return ctx->TransformFeedback.RasterDiscard;
1462 #endif
1463
1464       /* GL 3.1 primitive restart */
1465       case GL_PRIMITIVE_RESTART:
1466          if (ctx->VersionMajor * 10 + ctx->VersionMinor < 31) {
1467             goto invalid_enum_error;
1468          }
1469          return ctx->Array.PrimitiveRestart;
1470
1471       default:
1472          goto invalid_enum_error;
1473    }
1474
1475    return GL_FALSE;
1476
1477 invalid_enum_error:
1478    _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabled(0x%x)", (int) cap);
1479    return GL_FALSE;
1480 }