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 "mfeatures.h"
  37 #include "mtypes.h"
  38 #include "enums.h"
  39 #include "api_arrayelt.h"
  40 #include "texstate.h"
  41
  42
  43
  44 #define CHECK_EXTENSION(EXTNAME, CAP)                                   \
  45    if (!ctx->Extensions.EXTNAME) {                                      \
  46       goto invalid_enum_error;                                          \
  47    }
  48
  49
  50 /**
  51  * Helper to enable/disable client-side state.
  52  */
  53 static void
  54 client_state(struct gl_context *ctx, GLenum cap, GLboolean state)
  55 {
  56    struct gl_array_object *arrayObj = ctx->Array.ArrayObj;
  57    GLuint flag;
  58    GLboolean *var;
  59
  60    switch (cap) {
  61       case GL_VERTEX_ARRAY:
  62          var = &arrayObj->Vertex.Enabled;
  63          flag = _NEW_ARRAY_VERTEX;
  64          break;
  65       case GL_NORMAL_ARRAY:
  66          var = &arrayObj->Normal.Enabled;
  67          flag = _NEW_ARRAY_NORMAL;
  68          break;
  69       case GL_COLOR_ARRAY:
  70          var = &arrayObj->Color.Enabled;
  71          flag = _NEW_ARRAY_COLOR0;
  72          break;
  73       case GL_INDEX_ARRAY:
  74          var = &arrayObj->Index.Enabled;
  75          flag = _NEW_ARRAY_INDEX;
  76          break;
  77       case GL_TEXTURE_COORD_ARRAY:
  78          var = &arrayObj->TexCoord[ctx->Array.ActiveTexture].Enabled;
  79          flag = _NEW_ARRAY_TEXCOORD(ctx->Array.ActiveTexture);
  80          break;
  81       case GL_EDGE_FLAG_ARRAY:
  82          var = &arrayObj->EdgeFlag.Enabled;
  83          flag = _NEW_ARRAY_EDGEFLAG;
  84          break;
  85       case GL_FOG_COORDINATE_ARRAY_EXT:
  86          var = &arrayObj->FogCoord.Enabled;
  87          flag = _NEW_ARRAY_FOGCOORD;
  88          break;
  89       case GL_SECONDARY_COLOR_ARRAY_EXT:
  90          var = &arrayObj->SecondaryColor.Enabled;
  91          flag = _NEW_ARRAY_COLOR1;
  92          break;
  93
  94 #if FEATURE_point_size_array
  95       case GL_POINT_SIZE_ARRAY_OES:
  96          var = &arrayObj->PointSize.Enabled;
  97          flag = _NEW_ARRAY_POINT_SIZE;
  98          break;
  99 #endif
 100
 101 #if FEATURE_NV_vertex_program
 102       case GL_VERTEX_ATTRIB_ARRAY0_NV:
 103       case GL_VERTEX_ATTRIB_ARRAY1_NV:
 104       case GL_VERTEX_ATTRIB_ARRAY2_NV:
 105       case GL_VERTEX_ATTRIB_ARRAY3_NV:
 106       case GL_VERTEX_ATTRIB_ARRAY4_NV:
 107       case GL_VERTEX_ATTRIB_ARRAY5_NV:
 108       case GL_VERTEX_ATTRIB_ARRAY6_NV:
 109       case GL_VERTEX_ATTRIB_ARRAY7_NV:
 110       case GL_VERTEX_ATTRIB_ARRAY8_NV:
 111       case GL_VERTEX_ATTRIB_ARRAY9_NV:
 112       case GL_VERTEX_ATTRIB_ARRAY10_NV:
 113       case GL_VERTEX_ATTRIB_ARRAY11_NV:
 114       case GL_VERTEX_ATTRIB_ARRAY12_NV:
 115       case GL_VERTEX_ATTRIB_ARRAY13_NV:
 116       case GL_VERTEX_ATTRIB_ARRAY14_NV:
 117       case GL_VERTEX_ATTRIB_ARRAY15_NV:
 118          CHECK_EXTENSION(NV_vertex_program, cap);
 119          {
 120             GLint n = (GLint) cap - GL_VERTEX_ATTRIB_ARRAY0_NV;
 121             ASSERT(n < Elements(ctx->Array.ArrayObj->VertexAttrib));
 122             var = &arrayObj->VertexAttrib[n].Enabled;
 123             flag = _NEW_ARRAY_ATTRIB(n);
 124          }
 125          break;
 126 #endif /* FEATURE_NV_vertex_program */
 127
 128       /* GL_NV_primitive_restart */
 129       case GL_PRIMITIVE_RESTART_NV:
 130          if (!ctx->Extensions.NV_primitive_restart) {
 131             goto invalid_enum_error;
 132          }
 133          var = &ctx->Array.PrimitiveRestart;
 134          flag = 0;
 135          break;
 136
 137       default:
 138          goto invalid_enum_error;
 139    }
 140
 141    if (*var == state)
 142       return;
 143
 144    FLUSH_VERTICES(ctx, _NEW_ARRAY);
 145    ctx->Array.NewState |= flag;
 146
 147    _ae_invalidate_state(ctx, _NEW_ARRAY);
 148
 149    *var = state;
 150
 151    if (state)
 152       ctx->Array.ArrayObj->_Enabled |= flag;
 153    else
 154       ctx->Array.ArrayObj->_Enabled &= ~flag;
 155
 156    if (ctx->Driver.Enable) {
 157       ctx->Driver.Enable( ctx, cap, state );
 158    }
 159
 160    return;
 161
 162 invalid_enum_error:
 163    _mesa_error(ctx, GL_INVALID_ENUM, "gl%sClientState(0x%x)",
 164                state ? "Enable" : "Disable", cap);
 165 }
 166
 167
 168 /**
 169  * Enable GL capability.
 170  * \param cap  state to enable/disable.
 171  *
 172  * Get's the current context, assures that we're outside glBegin()/glEnd() and
 173  * calls client_state().
 174  */
 175 void GLAPIENTRY
 176 _mesa_EnableClientState( GLenum cap )
 177 {
 178    GET_CURRENT_CONTEXT(ctx);
 179    ASSERT_OUTSIDE_BEGIN_END(ctx);
 180    client_state( ctx, cap, GL_TRUE );
 181 }
 182
 183
 184 /**
 185  * Disable GL capability.
 186  * \param cap  state to enable/disable.
 187  *
 188  * Get's the current context, assures that we're outside glBegin()/glEnd() and
 189  * calls client_state().
 190  */
 191 void GLAPIENTRY
 192 _mesa_DisableClientState( GLenum cap )
 193 {
 194    GET_CURRENT_CONTEXT(ctx);
 195    ASSERT_OUTSIDE_BEGIN_END(ctx);
 196    client_state( ctx, cap, GL_FALSE );
 197 }
 198
 199
 200 #undef CHECK_EXTENSION
 201 #define CHECK_EXTENSION(EXTNAME, CAP)                                   \
 202    if (!ctx->Extensions.EXTNAME) {                                      \
 203       goto invalid_enum_error;                                          \
 204    }
 205
 206 #define CHECK_EXTENSION2(EXT1, EXT2, CAP)                               \
 207    if (!ctx->Extensions.EXT1 && !ctx->Extensions.EXT2) {                \
 208       goto invalid_enum_error;                                          \
 209    }
 210
 211
 212
 213 /**
 214  * Return pointer to current texture unit for setting/getting coordinate
 215  * state.
 216  * Note that we'll set GL_INVALID_OPERATION if the active texture unit is
 217  * higher than the number of supported coordinate units.  And we'll return NULL.
 218  */
 219 static struct gl_texture_unit *
 220 get_texcoord_unit(struct gl_context *ctx)
 221 {
 222    if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
 223       _mesa_error(ctx, GL_INVALID_OPERATION, "glEnable/Disable(texcoord unit)");
 224       return NULL;
 225    }
 226    else {
 227       return &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
 228    }
 229 }
 230
 231
 232 /**
 233  * Helper function to enable or disable a texture target.
 234  * \param bit  one of the TEXTURE_x_BIT values
 235  * \return GL_TRUE if state is changing or GL_FALSE if no change
 236  */
 237 static GLboolean
 238 enable_texture(struct gl_context *ctx, GLboolean state, GLbitfield texBit)
 239 {
 240    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 241    const GLbitfield newenabled = state
 242       ? (texUnit->Enabled | texBit) : (texUnit->Enabled & ~texBit);
 243
 244    if (texUnit->Enabled == newenabled)
 245        return GL_FALSE;
 246
 247    FLUSH_VERTICES(ctx, _NEW_TEXTURE);
 248    texUnit->Enabled = newenabled;
 249    return GL_TRUE;
 250 }
 251
 252
 253 /**
 254  * Helper function to enable or disable state.
 255  *
 256  * \param ctx GL context.
 257  * \param cap  the state to enable/disable
 258  * \param state whether to enable or disable the specified capability.
 259  *
 260  * Updates the current context and flushes the vertices as needed. For
 261  * capabilities associated with extensions it verifies that those extensions
 262  * are effectivly present before updating. Notifies the driver via
 263  * dd_function_table::Enable.
 264  */
 265 void
 266 _mesa_set_enable(struct gl_context *ctx, GLenum cap, GLboolean state)
 267 {
 268    if (MESA_VERBOSE & VERBOSE_API)
 269       _mesa_debug(ctx, "%s %s (newstate is %x)\n",
 270                   state ? "glEnable" : "glDisable",
 271                   _mesa_lookup_enum_by_nr(cap),
 272                   ctx->NewState);
 273
 274    switch (cap) {
 275       case GL_ALPHA_TEST:
 276          if (ctx->Color.AlphaEnabled == state)
 277             return;
 278          FLUSH_VERTICES(ctx, _NEW_COLOR);
 279          ctx->Color.AlphaEnabled = state;
 280          break;
 281       case GL_AUTO_NORMAL:
 282          if (ctx->Eval.AutoNormal == state)
 283             return;
 284          FLUSH_VERTICES(ctx, _NEW_EVAL);
 285          ctx->Eval.AutoNormal = state;
 286          break;
 287       case GL_BLEND:
 288          {
 289             GLbitfield newEnabled = state * ((1 << ctx->Const.MaxDrawBuffers) - 1);
 290             if (newEnabled != ctx->Color.BlendEnabled) {
 291                FLUSH_VERTICES(ctx, _NEW_COLOR);
 292                ctx->Color.BlendEnabled = newEnabled;
 293             }
 294          }
 295          break;
 296 #if FEATURE_userclip
 297       case GL_CLIP_PLANE0:
 298       case GL_CLIP_PLANE1:
 299       case GL_CLIP_PLANE2:
 300       case GL_CLIP_PLANE3:
 301       case GL_CLIP_PLANE4:
 302       case GL_CLIP_PLANE5:
 303          {
 304             const GLuint p = cap - GL_CLIP_PLANE0;
 305
 306             if ((ctx->Transform.ClipPlanesEnabled & (1 << p)) == ((GLuint) state << p))
 307                return;
 308
 309             FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 310
 311             if (state) {
 312                ctx->Transform.ClipPlanesEnabled |= (1 << p);
 313
 314                if (_math_matrix_is_dirty(ctx->ProjectionMatrixStack.Top))
 315                   _math_matrix_analyse( ctx->ProjectionMatrixStack.Top );
 316
 317                /* This derived state also calculated in clip.c and
 318                 * from _mesa_update_state() on changes to EyeUserPlane
 319                 * and ctx->ProjectionMatrix respectively.
 320                 */
 321                _mesa_transform_vector( ctx->Transform._ClipUserPlane[p],
 322                                     ctx->Transform.EyeUserPlane[p],
 323                                     ctx->ProjectionMatrixStack.Top->inv );
 324             }
 325             else {
 326                ctx->Transform.ClipPlanesEnabled &= ~(1 << p);
 327             }
 328          }
 329          break;
 330 #endif
 331       case GL_COLOR_MATERIAL:
 332          if (ctx->Light.ColorMaterialEnabled == state)
 333             return;
 334          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 335          FLUSH_CURRENT(ctx, 0);
 336          ctx->Light.ColorMaterialEnabled = state;
 337          if (state) {
 338             _mesa_update_color_material( ctx,
 339                                   ctx->Current.Attrib[VERT_ATTRIB_COLOR0] );
 340          }
 341          break;
 342       case GL_CULL_FACE:
 343          if (ctx->Polygon.CullFlag == state)
 344             return;
 345          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 346          ctx->Polygon.CullFlag = state;
 347          break;
 348       case GL_DEPTH_TEST:
 349          if (ctx->Depth.Test == state)
 350             return;
 351          FLUSH_VERTICES(ctx, _NEW_DEPTH);
 352          ctx->Depth.Test = state;
 353          break;
 354       case GL_DITHER:
 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.  Note: this enum is different from
 956        * GL_PRIMITIVE_RESTART_NV (which is client state).
 957        */
 958       case GL_PRIMITIVE_RESTART:
 959          if (ctx->VersionMajor * 10 + ctx->VersionMinor < 31) {
 960             goto invalid_enum_error;
 961          }
 962          if (ctx->Array.PrimitiveRestart != state) {
 963             FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 964             ctx->Array.PrimitiveRestart = state;
 965          }
 966          break;
 967
 968       /* GL3.0 - GL_framebuffer_sRGB */
 969       case GL_FRAMEBUFFER_SRGB_EXT:
 970          CHECK_EXTENSION(EXT_framebuffer_sRGB, cap);
 971          FLUSH_VERTICES(ctx, _NEW_BUFFERS);
 972          ctx->Color.sRGBEnabled = state;
 973          break;
 974
 975       default:
 976          goto invalid_enum_error;
 977    }
 978
 979    if (ctx->Driver.Enable) {
 980       ctx->Driver.Enable( ctx, cap, state );
 981    }
 982
 983    return;
 984
 985 invalid_enum_error:
 986    _mesa_error(ctx, GL_INVALID_ENUM, "gl%s(0x%x)",
 987                state ? "Enable" : "Disable", cap);
 988 }
 989
 990
 991 /**
 992  * Enable GL capability.  Called by glEnable()
 993  * \param cap  state to enable.
 994  */
 995 void GLAPIENTRY
 996 _mesa_Enable( GLenum cap )
 997 {
 998    GET_CURRENT_CONTEXT(ctx);
 999    ASSERT_OUTSIDE_BEGIN_END(ctx);
1000
1001    _mesa_set_enable( ctx, cap, GL_TRUE );
1002 }
1003
1004
1005 /**
1006  * Disable GL capability.  Called by glDisable()
1007  * \param cap  state to disable.
1008  */
1009 void GLAPIENTRY
1010 _mesa_Disable( GLenum cap )
1011 {
1012    GET_CURRENT_CONTEXT(ctx);
1013    ASSERT_OUTSIDE_BEGIN_END(ctx);
1014
1015    _mesa_set_enable( ctx, cap, GL_FALSE );
1016 }
1017
1018
1019
1020 /**
1021  * Enable/disable an indexed state var.
1022  */
1023 void
1024 _mesa_set_enablei(struct gl_context *ctx, GLenum cap, GLuint index, GLboolean state)
1025 {
1026    ASSERT(state == 0 || state == 1);
1027    switch (cap) {
1028    case GL_BLEND:
1029       if (!ctx->Extensions.EXT_draw_buffers2) {
1030          goto invalid_enum_error;
1031       }
1032       if (index >= ctx->Const.MaxDrawBuffers) {
1033          _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%u)",
1034                      state ? "glEnableIndexed" : "glDisableIndexed", index);
1035          return;
1036       }
1037       if (((ctx->Color.BlendEnabled >> index) & 1) != state) {
1038          FLUSH_VERTICES(ctx, _NEW_COLOR);
1039          if (state)
1040             ctx->Color.BlendEnabled |= (1 << index);
1041          else
1042             ctx->Color.BlendEnabled &= ~(1 << index);
1043       }
1044       break;
1045    default:
1046       goto invalid_enum_error;
1047    }
1048    return;
1049
1050 invalid_enum_error:
1051     _mesa_error(ctx, GL_INVALID_ENUM, "%s(cap=%s)",
1052                 state ? "glEnablei" : "glDisablei",
1053                 _mesa_lookup_enum_by_nr(cap));
1054 }
1055
1056
1057 void GLAPIENTRY
1058 _mesa_DisableIndexed( GLenum cap, GLuint index )
1059 {
1060    GET_CURRENT_CONTEXT(ctx);
1061    ASSERT_OUTSIDE_BEGIN_END(ctx);
1062    _mesa_set_enablei(ctx, cap, index, GL_FALSE);
1063 }
1064
1065
1066 void GLAPIENTRY
1067 _mesa_EnableIndexed( GLenum cap, GLuint index )
1068 {
1069    GET_CURRENT_CONTEXT(ctx);
1070    ASSERT_OUTSIDE_BEGIN_END(ctx);
1071    _mesa_set_enablei(ctx, cap, index, GL_TRUE);
1072 }
1073
1074
1075 GLboolean GLAPIENTRY
1076 _mesa_IsEnabledIndexed( GLenum cap, GLuint index )
1077 {
1078    GET_CURRENT_CONTEXT(ctx);
1079    switch (cap) {
1080    case GL_BLEND:
1081       if (index >= ctx->Const.MaxDrawBuffers) {
1082          _mesa_error(ctx, GL_INVALID_VALUE, "glIsEnabledIndexed(index=%u)",
1083                      index);
1084          return GL_FALSE;
1085       }
1086       return (ctx->Color.BlendEnabled >> index) & 1;
1087    default:
1088       _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabledIndexed(cap=%s)",
1089                   _mesa_lookup_enum_by_nr(cap));
1090       return GL_FALSE;
1091    }
1092 }
1093
1094
1095
1096
1097 #undef CHECK_EXTENSION
1098 #define CHECK_EXTENSION(EXTNAME)                        \
1099    if (!ctx->Extensions.EXTNAME) {                      \
1100       goto invalid_enum_error;                          \
1101    }
1102
1103 #undef CHECK_EXTENSION2
1104 #define CHECK_EXTENSION2(EXT1, EXT2)                            \
1105    if (!ctx->Extensions.EXT1 && !ctx->Extensions.EXT2) {        \
1106       goto invalid_enum_error;                                  \
1107    }
1108
1109
1110 /**
1111  * Helper function to determine whether a texture target is enabled.
1112  */
1113 static GLboolean
1114 is_texture_enabled(struct gl_context *ctx, GLbitfield bit)
1115 {
1116    const struct gl_texture_unit *const texUnit =
1117        &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
1118    return (texUnit->Enabled & bit) ? GL_TRUE : GL_FALSE;
1119 }
1120
1121
1122 /**
1123  * Return simple enable/disable state.
1124  *
1125  * \param cap  state variable to query.
1126  *
1127  * Returns the state of the specified capability from the current GL context.
1128  * For the capabilities associated with extensions verifies that those
1129  * extensions are effectively present before reporting.
1130  */
1131 GLboolean GLAPIENTRY
1132 _mesa_IsEnabled( GLenum cap )
1133 {
1134    GET_CURRENT_CONTEXT(ctx);
1135    switch (cap) {
1136       case GL_ALPHA_TEST:
1137          return ctx->Color.AlphaEnabled;
1138       case GL_AUTO_NORMAL:
1139          return ctx->Eval.AutoNormal;
1140       case GL_BLEND:
1141          return ctx->Color.BlendEnabled & 1;  /* return state for buffer[0] */
1142       case GL_CLIP_PLANE0:
1143       case GL_CLIP_PLANE1:
1144       case GL_CLIP_PLANE2:
1145       case GL_CLIP_PLANE3:
1146       case GL_CLIP_PLANE4:
1147       case GL_CLIP_PLANE5:
1148          return (ctx->Transform.ClipPlanesEnabled >> (cap - GL_CLIP_PLANE0)) & 1;
1149       case GL_COLOR_MATERIAL:
1150          return ctx->Light.ColorMaterialEnabled;
1151       case GL_CULL_FACE:
1152          return ctx->Polygon.CullFlag;
1153       case GL_DEPTH_TEST:
1154          return ctx->Depth.Test;
1155       case GL_DITHER:
1156          return ctx->Color.DitherFlag;
1157       case GL_FOG:
1158          return ctx->Fog.Enabled;
1159       case GL_LIGHTING:
1160          return ctx->Light.Enabled;
1161       case GL_LIGHT0:
1162       case GL_LIGHT1:
1163       case GL_LIGHT2:
1164       case GL_LIGHT3:
1165       case GL_LIGHT4:
1166       case GL_LIGHT5:
1167       case GL_LIGHT6:
1168       case GL_LIGHT7:
1169          return ctx->Light.Light[cap-GL_LIGHT0].Enabled;
1170       case GL_LINE_SMOOTH:
1171          return ctx->Line.SmoothFlag;
1172       case GL_LINE_STIPPLE:
1173          return ctx->Line.StippleFlag;
1174       case GL_INDEX_LOGIC_OP:
1175          return ctx->Color.IndexLogicOpEnabled;
1176       case GL_COLOR_LOGIC_OP:
1177          return ctx->Color.ColorLogicOpEnabled;
1178       case GL_MAP1_COLOR_4:
1179          return ctx->Eval.Map1Color4;
1180       case GL_MAP1_INDEX:
1181          return ctx->Eval.Map1Index;
1182       case GL_MAP1_NORMAL:
1183          return ctx->Eval.Map1Normal;
1184       case GL_MAP1_TEXTURE_COORD_1:
1185          return ctx->Eval.Map1TextureCoord1;
1186       case GL_MAP1_TEXTURE_COORD_2:
1187          return ctx->Eval.Map1TextureCoord2;
1188       case GL_MAP1_TEXTURE_COORD_3:
1189          return ctx->Eval.Map1TextureCoord3;
1190       case GL_MAP1_TEXTURE_COORD_4:
1191          return ctx->Eval.Map1TextureCoord4;
1192       case GL_MAP1_VERTEX_3:
1193          return ctx->Eval.Map1Vertex3;
1194       case GL_MAP1_VERTEX_4:
1195          return ctx->Eval.Map1Vertex4;
1196       case GL_MAP2_COLOR_4:
1197          return ctx->Eval.Map2Color4;
1198       case GL_MAP2_INDEX:
1199          return ctx->Eval.Map2Index;
1200       case GL_MAP2_NORMAL:
1201          return ctx->Eval.Map2Normal;
1202       case GL_MAP2_TEXTURE_COORD_1:
1203          return ctx->Eval.Map2TextureCoord1;
1204       case GL_MAP2_TEXTURE_COORD_2:
1205          return ctx->Eval.Map2TextureCoord2;
1206       case GL_MAP2_TEXTURE_COORD_3:
1207          return ctx->Eval.Map2TextureCoord3;
1208       case GL_MAP2_TEXTURE_COORD_4:
1209          return ctx->Eval.Map2TextureCoord4;
1210       case GL_MAP2_VERTEX_3:
1211          return ctx->Eval.Map2Vertex3;
1212       case GL_MAP2_VERTEX_4:
1213          return ctx->Eval.Map2Vertex4;
1214       case GL_NORMALIZE:
1215          return ctx->Transform.Normalize;
1216       case GL_POINT_SMOOTH:
1217          return ctx->Point.SmoothFlag;
1218       case GL_POLYGON_SMOOTH:
1219          return ctx->Polygon.SmoothFlag;
1220       case GL_POLYGON_STIPPLE:
1221          return ctx->Polygon.StippleFlag;
1222       case GL_POLYGON_OFFSET_POINT:
1223          return ctx->Polygon.OffsetPoint;
1224       case GL_POLYGON_OFFSET_LINE:
1225          return ctx->Polygon.OffsetLine;
1226       case GL_POLYGON_OFFSET_FILL:
1227       /*case GL_POLYGON_OFFSET_EXT:*/
1228          return ctx->Polygon.OffsetFill;
1229       case GL_RESCALE_NORMAL_EXT:
1230          return ctx->Transform.RescaleNormals;
1231       case GL_SCISSOR_TEST:
1232          return ctx->Scissor.Enabled;
1233       case GL_SHARED_TEXTURE_PALETTE_EXT:
1234          return ctx->Texture.SharedPalette;
1235       case GL_STENCIL_TEST:
1236          return ctx->Stencil.Enabled;
1237       case GL_TEXTURE_1D:
1238          return is_texture_enabled(ctx, TEXTURE_1D_BIT);
1239       case GL_TEXTURE_2D:
1240          return is_texture_enabled(ctx, TEXTURE_2D_BIT);
1241       case GL_TEXTURE_3D:
1242          return is_texture_enabled(ctx, TEXTURE_3D_BIT);
1243       case GL_TEXTURE_GEN_Q:
1244          {
1245             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1246             if (texUnit) {
1247                return (texUnit->TexGenEnabled & Q_BIT) ? GL_TRUE : GL_FALSE;
1248             }
1249          }
1250          return GL_FALSE;
1251       case GL_TEXTURE_GEN_R:
1252          {
1253             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1254             if (texUnit) {
1255                return (texUnit->TexGenEnabled & R_BIT) ? GL_TRUE : GL_FALSE;
1256             }
1257          }
1258          return GL_FALSE;
1259       case GL_TEXTURE_GEN_S:
1260          {
1261             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1262             if (texUnit) {
1263                return (texUnit->TexGenEnabled & S_BIT) ? GL_TRUE : GL_FALSE;
1264             }
1265          }
1266          return GL_FALSE;
1267       case GL_TEXTURE_GEN_T:
1268          {
1269             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1270             if (texUnit) {
1271                return (texUnit->TexGenEnabled & T_BIT) ? GL_TRUE : GL_FALSE;
1272             }
1273          }
1274          return GL_FALSE;
1275 #if FEATURE_ES1
1276       case GL_TEXTURE_GEN_STR_OES:
1277          {
1278             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1279             if (texUnit) {
1280                     return (texUnit->TexGenEnabled & STR_BITS) == STR_BITS ? GL_TRUE : GL_FALSE;
1281             }
1282          }
1283 #endif
1284
1285       /*
1286        * CLIENT STATE!!!
1287        */
1288       case GL_VERTEX_ARRAY:
1289          return (ctx->Array.ArrayObj->Vertex.Enabled != 0);
1290       case GL_NORMAL_ARRAY:
1291          return (ctx->Array.ArrayObj->Normal.Enabled != 0);
1292       case GL_COLOR_ARRAY:
1293          return (ctx->Array.ArrayObj->Color.Enabled != 0);
1294       case GL_INDEX_ARRAY:
1295          return (ctx->Array.ArrayObj->Index.Enabled != 0);
1296       case GL_TEXTURE_COORD_ARRAY:
1297          return (ctx->Array.ArrayObj->TexCoord[ctx->Array.ActiveTexture].Enabled != 0);
1298       case GL_EDGE_FLAG_ARRAY:
1299          return (ctx->Array.ArrayObj->EdgeFlag.Enabled != 0);
1300       case GL_FOG_COORDINATE_ARRAY_EXT:
1301          CHECK_EXTENSION(EXT_fog_coord);
1302          return (ctx->Array.ArrayObj->FogCoord.Enabled != 0);
1303       case GL_SECONDARY_COLOR_ARRAY_EXT:
1304          CHECK_EXTENSION(EXT_secondary_color);
1305          return (ctx->Array.ArrayObj->SecondaryColor.Enabled != 0);
1306 #if FEATURE_point_size_array
1307       case GL_POINT_SIZE_ARRAY_OES:
1308          return (ctx->Array.ArrayObj->PointSize.Enabled != 0);
1309 #endif
1310
1311       /* GL_SGI_texture_color_table */
1312       case GL_TEXTURE_COLOR_TABLE_SGI:
1313          CHECK_EXTENSION(SGI_texture_color_table);
1314          return ctx->Texture.Unit[ctx->Texture.CurrentUnit].ColorTableEnabled;
1315
1316       /* GL_ARB_texture_cube_map */
1317       case GL_TEXTURE_CUBE_MAP_ARB:
1318          CHECK_EXTENSION(ARB_texture_cube_map);
1319          return is_texture_enabled(ctx, TEXTURE_CUBE_BIT);
1320
1321       /* GL_EXT_secondary_color */
1322       case GL_COLOR_SUM_EXT:
1323          CHECK_EXTENSION2(EXT_secondary_color, ARB_vertex_program);
1324          return ctx->Fog.ColorSumEnabled;
1325
1326       /* GL_ARB_multisample */
1327       case GL_MULTISAMPLE_ARB:
1328          return ctx->Multisample.Enabled;
1329       case GL_SAMPLE_ALPHA_TO_COVERAGE_ARB:
1330          return ctx->Multisample.SampleAlphaToCoverage;
1331       case GL_SAMPLE_ALPHA_TO_ONE_ARB:
1332          return ctx->Multisample.SampleAlphaToOne;
1333       case GL_SAMPLE_COVERAGE_ARB:
1334          return ctx->Multisample.SampleCoverage;
1335       case GL_SAMPLE_COVERAGE_INVERT_ARB:
1336          return ctx->Multisample.SampleCoverageInvert;
1337
1338       /* GL_IBM_rasterpos_clip */
1339       case GL_RASTER_POSITION_UNCLIPPED_IBM:
1340          CHECK_EXTENSION(IBM_rasterpos_clip);
1341          return ctx->Transform.RasterPositionUnclipped;
1342
1343       /* GL_NV_point_sprite */
1344       case GL_POINT_SPRITE_NV:
1345          CHECK_EXTENSION2(NV_point_sprite, ARB_point_sprite)
1346          return ctx->Point.PointSprite;
1347
1348 #if FEATURE_NV_vertex_program || FEATURE_ARB_vertex_program
1349       case GL_VERTEX_PROGRAM_ARB:
1350          CHECK_EXTENSION2(ARB_vertex_program, NV_vertex_program);
1351          return ctx->VertexProgram.Enabled;
1352       case GL_VERTEX_PROGRAM_POINT_SIZE_ARB:
1353          CHECK_EXTENSION2(ARB_vertex_program, NV_vertex_program);
1354          return ctx->VertexProgram.PointSizeEnabled;
1355       case GL_VERTEX_PROGRAM_TWO_SIDE_ARB:
1356          CHECK_EXTENSION2(ARB_vertex_program, NV_vertex_program);
1357          return ctx->VertexProgram.TwoSideEnabled;
1358 #endif
1359 #if FEATURE_NV_vertex_program
1360       case GL_VERTEX_ATTRIB_ARRAY0_NV:
1361       case GL_VERTEX_ATTRIB_ARRAY1_NV:
1362       case GL_VERTEX_ATTRIB_ARRAY2_NV:
1363       case GL_VERTEX_ATTRIB_ARRAY3_NV:
1364       case GL_VERTEX_ATTRIB_ARRAY4_NV:
1365       case GL_VERTEX_ATTRIB_ARRAY5_NV:
1366       case GL_VERTEX_ATTRIB_ARRAY6_NV:
1367       case GL_VERTEX_ATTRIB_ARRAY7_NV:
1368       case GL_VERTEX_ATTRIB_ARRAY8_NV:
1369       case GL_VERTEX_ATTRIB_ARRAY9_NV:
1370       case GL_VERTEX_ATTRIB_ARRAY10_NV:
1371       case GL_VERTEX_ATTRIB_ARRAY11_NV:
1372       case GL_VERTEX_ATTRIB_ARRAY12_NV:
1373       case GL_VERTEX_ATTRIB_ARRAY13_NV:
1374       case GL_VERTEX_ATTRIB_ARRAY14_NV:
1375       case GL_VERTEX_ATTRIB_ARRAY15_NV:
1376          CHECK_EXTENSION(NV_vertex_program);
1377          {
1378             GLint n = (GLint) cap - GL_VERTEX_ATTRIB_ARRAY0_NV;
1379             ASSERT(n < Elements(ctx->Array.ArrayObj->VertexAttrib));
1380             return (ctx->Array.ArrayObj->VertexAttrib[n].Enabled != 0);
1381          }
1382       case GL_MAP1_VERTEX_ATTRIB0_4_NV:
1383       case GL_MAP1_VERTEX_ATTRIB1_4_NV:
1384       case GL_MAP1_VERTEX_ATTRIB2_4_NV:
1385       case GL_MAP1_VERTEX_ATTRIB3_4_NV:
1386       case GL_MAP1_VERTEX_ATTRIB4_4_NV:
1387       case GL_MAP1_VERTEX_ATTRIB5_4_NV:
1388       case GL_MAP1_VERTEX_ATTRIB6_4_NV:
1389       case GL_MAP1_VERTEX_ATTRIB7_4_NV:
1390       case GL_MAP1_VERTEX_ATTRIB8_4_NV:
1391       case GL_MAP1_VERTEX_ATTRIB9_4_NV:
1392       case GL_MAP1_VERTEX_ATTRIB10_4_NV:
1393       case GL_MAP1_VERTEX_ATTRIB11_4_NV:
1394       case GL_MAP1_VERTEX_ATTRIB12_4_NV:
1395       case GL_MAP1_VERTEX_ATTRIB13_4_NV:
1396       case GL_MAP1_VERTEX_ATTRIB14_4_NV:
1397       case GL_MAP1_VERTEX_ATTRIB15_4_NV:
1398          CHECK_EXTENSION(NV_vertex_program);
1399          {
1400             const GLuint map = (GLuint) (cap - GL_MAP1_VERTEX_ATTRIB0_4_NV);
1401             return ctx->Eval.Map1Attrib[map];
1402          }
1403       case GL_MAP2_VERTEX_ATTRIB0_4_NV:
1404       case GL_MAP2_VERTEX_ATTRIB1_4_NV:
1405       case GL_MAP2_VERTEX_ATTRIB2_4_NV:
1406       case GL_MAP2_VERTEX_ATTRIB3_4_NV:
1407       case GL_MAP2_VERTEX_ATTRIB4_4_NV:
1408       case GL_MAP2_VERTEX_ATTRIB5_4_NV:
1409       case GL_MAP2_VERTEX_ATTRIB6_4_NV:
1410       case GL_MAP2_VERTEX_ATTRIB7_4_NV:
1411       case GL_MAP2_VERTEX_ATTRIB8_4_NV:
1412       case GL_MAP2_VERTEX_ATTRIB9_4_NV:
1413       case GL_MAP2_VERTEX_ATTRIB10_4_NV:
1414       case GL_MAP2_VERTEX_ATTRIB11_4_NV:
1415       case GL_MAP2_VERTEX_ATTRIB12_4_NV:
1416       case GL_MAP2_VERTEX_ATTRIB13_4_NV:
1417       case GL_MAP2_VERTEX_ATTRIB14_4_NV:
1418       case GL_MAP2_VERTEX_ATTRIB15_4_NV:
1419          CHECK_EXTENSION(NV_vertex_program);
1420          {
1421             const GLuint map = (GLuint) (cap - GL_MAP2_VERTEX_ATTRIB0_4_NV);
1422             return ctx->Eval.Map2Attrib[map];
1423          }
1424 #endif /* FEATURE_NV_vertex_program */
1425
1426 #if FEATURE_NV_fragment_program
1427       case GL_FRAGMENT_PROGRAM_NV:
1428          CHECK_EXTENSION(NV_fragment_program);
1429          return ctx->FragmentProgram.Enabled;
1430 #endif /* FEATURE_NV_fragment_program */
1431
1432       /* GL_NV_texture_rectangle */
1433       case GL_TEXTURE_RECTANGLE_NV:
1434          CHECK_EXTENSION(NV_texture_rectangle);
1435          return is_texture_enabled(ctx, TEXTURE_RECT_BIT);
1436
1437       /* GL_EXT_stencil_two_side */
1438       case GL_STENCIL_TEST_TWO_SIDE_EXT:
1439          CHECK_EXTENSION(EXT_stencil_two_side);
1440          return ctx->Stencil.TestTwoSide;
1441
1442 #if FEATURE_ARB_fragment_program
1443       case GL_FRAGMENT_PROGRAM_ARB:
1444          return ctx->FragmentProgram.Enabled;
1445 #endif /* FEATURE_ARB_fragment_program */
1446
1447       /* GL_EXT_depth_bounds_test */
1448       case GL_DEPTH_BOUNDS_TEST_EXT:
1449          CHECK_EXTENSION(EXT_depth_bounds_test);
1450          return ctx->Depth.BoundsTest;
1451
1452       /* GL_ARB_depth_clamp */
1453       case GL_DEPTH_CLAMP:
1454          CHECK_EXTENSION(ARB_depth_clamp);
1455          return ctx->Transform.DepthClamp;
1456
1457 #if FEATURE_ATI_fragment_shader
1458       case GL_FRAGMENT_SHADER_ATI:
1459          CHECK_EXTENSION(ATI_fragment_shader);
1460          return ctx->ATIFragmentShader.Enabled;
1461 #endif /* FEATURE_ATI_fragment_shader */
1462
1463       case GL_TEXTURE_CUBE_MAP_SEAMLESS:
1464          CHECK_EXTENSION(ARB_seamless_cube_map);
1465          return ctx->Texture.CubeMapSeamless;
1466
1467 #if FEATURE_EXT_transform_feedback
1468       case GL_RASTERIZER_DISCARD:
1469          CHECK_EXTENSION(EXT_transform_feedback);
1470          return ctx->TransformFeedback.RasterDiscard;
1471 #endif
1472
1473       /* GL_NV_primitive_restart */
1474       case GL_PRIMITIVE_RESTART_NV:
1475          if (!ctx->Extensions.NV_primitive_restart) {
1476             goto invalid_enum_error;
1477          }
1478          return ctx->Array.PrimitiveRestart;
1479
1480       /* GL 3.1 primitive restart */
1481       case GL_PRIMITIVE_RESTART:
1482          if (ctx->VersionMajor * 10 + ctx->VersionMinor < 31) {
1483             goto invalid_enum_error;
1484          }
1485          return ctx->Array.PrimitiveRestart;
1486
1487       /* GL3.0 - GL_framebuffer_sRGB */
1488       case GL_FRAMEBUFFER_SRGB_EXT:
1489          CHECK_EXTENSION(EXT_framebuffer_sRGB);
1490          return ctx->Color.sRGBEnabled;
1491
1492       default:
1493          goto invalid_enum_error;
1494    }
1495
1496    return GL_FALSE;
1497
1498 invalid_enum_error:
1499    _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabled(0x%x)", (int) cap);
1500    return GL_FALSE;
1501 }