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  *
   9  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included
  19  * in all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  22  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  24  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  25  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  26  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  27  * OTHER DEALINGS IN THE SOFTWARE.
  28  */
  29
  30
  31 #include "glheader.h"
  32 #include "clip.h"
  33 #include "context.h"
  34 #include "debug_output.h"
  35 #include "enable.h"
  36 #include "errors.h"
  37 #include "light.h"
  38 #include "mtypes.h"
  39 #include "enums.h"
  40 #include "api_arrayelt.h"
  41 #include "texstate.h"
  42
  43
  44
  45 #define CHECK_EXTENSION(EXTNAME, CAP)                                   \
  46    if (!ctx->Extensions.EXTNAME) {                                      \
  47       goto invalid_enum_error;                                          \
  48    }
  49
  50
  51 static void
  52 update_derived_primitive_restart_state(struct gl_context *ctx)
  53 {
  54    /* Update derived primitive restart state.
  55     */
  56    ctx->Array._PrimitiveRestart = ctx->Array.PrimitiveRestart
  57       || ctx->Array.PrimitiveRestartFixedIndex;
  58 }
  59
  60 /**
  61  * Helper to enable/disable client-side state.
  62  */
  63 static void
  64 client_state(struct gl_context *ctx, GLenum cap, GLboolean state)
  65 {
  66    struct gl_vertex_array_object *vao = ctx->Array.VAO;
  67    GLbitfield64 flag;
  68    GLboolean *var;
  69
  70    switch (cap) {
  71       case GL_VERTEX_ARRAY:
  72          var = &vao->VertexAttrib[VERT_ATTRIB_POS].Enabled;
  73          flag = VERT_BIT_POS;
  74          break;
  75       case GL_NORMAL_ARRAY:
  76          var = &vao->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled;
  77          flag = VERT_BIT_NORMAL;
  78          break;
  79       case GL_COLOR_ARRAY:
  80          var = &vao->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled;
  81          flag = VERT_BIT_COLOR0;
  82          break;
  83       case GL_INDEX_ARRAY:
  84          var = &vao->VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled;
  85          flag = VERT_BIT_COLOR_INDEX;
  86          break;
  87       case GL_TEXTURE_COORD_ARRAY:
  88          var = &vao->VertexAttrib[VERT_ATTRIB_TEX(ctx->Array.ActiveTexture)].Enabled;
  89          flag = VERT_BIT_TEX(ctx->Array.ActiveTexture);
  90          break;
  91       case GL_EDGE_FLAG_ARRAY:
  92          var = &vao->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled;
  93          flag = VERT_BIT_EDGEFLAG;
  94          break;
  95       case GL_FOG_COORDINATE_ARRAY_EXT:
  96          var = &vao->VertexAttrib[VERT_ATTRIB_FOG].Enabled;
  97          flag = VERT_BIT_FOG;
  98          break;
  99       case GL_SECONDARY_COLOR_ARRAY_EXT:
 100          var = &vao->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled;
 101          flag = VERT_BIT_COLOR1;
 102          break;
 103
 104       case GL_POINT_SIZE_ARRAY_OES:
 105          var = &vao->VertexAttrib[VERT_ATTRIB_POINT_SIZE].Enabled;
 106          flag = VERT_BIT_POINT_SIZE;
 107          FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 108          ctx->VertexProgram.PointSizeEnabled = state;
 109          break;
 110
 111       /* GL_NV_primitive_restart */
 112       case GL_PRIMITIVE_RESTART_NV:
 113          if (!ctx->Extensions.NV_primitive_restart) {
 114             goto invalid_enum_error;
 115          }
 116          var = &ctx->Array.PrimitiveRestart;
 117          flag = 0;
 118          break;
 119
 120       default:
 121          goto invalid_enum_error;
 122    }
 123
 124    if (*var == state)
 125       return;
 126
 127    FLUSH_VERTICES(ctx, _NEW_ARRAY);
 128
 129    _ae_invalidate_state(ctx, _NEW_ARRAY);
 130
 131    *var = state;
 132
 133    update_derived_primitive_restart_state(ctx);
 134
 135    if (state)
 136       vao->_Enabled |= flag;
 137    else
 138       vao->_Enabled &= ~flag;
 139
 140    vao->NewArrays |= flag;
 141
 142    if (ctx->Driver.Enable) {
 143       ctx->Driver.Enable( ctx, cap, state );
 144    }
 145
 146    return;
 147
 148 invalid_enum_error:
 149    _mesa_error(ctx, GL_INVALID_ENUM, "gl%sClientState(%s)",
 150                state ? "Enable" : "Disable", _mesa_enum_to_string(cap));
 151 }
 152
 153
 154 /**
 155  * Enable GL capability.
 156  * \param cap  state to enable/disable.
 157  *
 158  * Get's the current context, assures that we're outside glBegin()/glEnd() and
 159  * calls client_state().
 160  */
 161 void GLAPIENTRY
 162 _mesa_EnableClientState( GLenum cap )
 163 {
 164    GET_CURRENT_CONTEXT(ctx);
 165    client_state( ctx, cap, GL_TRUE );
 166 }
 167
 168
 169 /**
 170  * Disable GL capability.
 171  * \param cap  state to enable/disable.
 172  *
 173  * Get's the current context, assures that we're outside glBegin()/glEnd() and
 174  * calls client_state().
 175  */
 176 void GLAPIENTRY
 177 _mesa_DisableClientState( GLenum cap )
 178 {
 179    GET_CURRENT_CONTEXT(ctx);
 180    client_state( ctx, cap, GL_FALSE );
 181 }
 182
 183
 184 #undef CHECK_EXTENSION
 185 #define CHECK_EXTENSION(EXTNAME, CAP)                                   \
 186    if (!ctx->Extensions.EXTNAME) {                                      \
 187       goto invalid_enum_error;                                          \
 188    }
 189
 190 #define CHECK_EXTENSION2(EXT1, EXT2, CAP)                               \
 191    if (!ctx->Extensions.EXT1 && !ctx->Extensions.EXT2) {                \
 192       goto invalid_enum_error;                                          \
 193    }
 194
 195 /**
 196  * Return pointer to current texture unit for setting/getting coordinate
 197  * state.
 198  * Note that we'll set GL_INVALID_OPERATION and return NULL if the active
 199  * texture unit is higher than the number of supported coordinate units.
 200  */
 201 static struct gl_texture_unit *
 202 get_texcoord_unit(struct gl_context *ctx)
 203 {
 204    if (ctx->Texture.CurrentUnit >= ctx->Const.MaxTextureCoordUnits) {
 205       _mesa_error(ctx, GL_INVALID_OPERATION, "glEnable/Disable(texcoord unit)");
 206       return NULL;
 207    }
 208    else {
 209       return &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
 210    }
 211 }
 212
 213
 214 /**
 215  * Helper function to enable or disable a texture target.
 216  * \param bit  one of the TEXTURE_x_BIT values
 217  * \return GL_TRUE if state is changing or GL_FALSE if no change
 218  */
 219 static GLboolean
 220 enable_texture(struct gl_context *ctx, GLboolean state, GLbitfield texBit)
 221 {
 222    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 223    const GLbitfield newenabled = state
 224       ? (texUnit->Enabled | texBit) : (texUnit->Enabled & ~texBit);
 225
 226    if (texUnit->Enabled == newenabled)
 227        return GL_FALSE;
 228
 229    FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
 230    texUnit->Enabled = newenabled;
 231    return GL_TRUE;
 232 }
 233
 234
 235 /**
 236  * Helper function to enable or disable GL_MULTISAMPLE, skipping the check for
 237  * whether the API supports it (GLES doesn't).
 238  */
 239 void
 240 _mesa_set_multisample(struct gl_context *ctx, GLboolean state)
 241 {
 242    if (ctx->Multisample.Enabled == state)
 243       return;
 244    FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 245    ctx->Multisample.Enabled = state;
 246
 247    if (ctx->Driver.Enable) {
 248       ctx->Driver.Enable(ctx, GL_MULTISAMPLE, state);
 249    }
 250 }
 251
 252 /**
 253  * Helper function to enable or disable GL_FRAMEBUFFER_SRGB, skipping the
 254  * check for whether the API supports it (GLES doesn't).
 255  */
 256 void
 257 _mesa_set_framebuffer_srgb(struct gl_context *ctx, GLboolean state)
 258 {
 259    if (ctx->Color.sRGBEnabled == state)
 260       return;
 261    FLUSH_VERTICES(ctx, _NEW_BUFFERS);
 262    ctx->Color.sRGBEnabled = state;
 263
 264    if (ctx->Driver.Enable) {
 265       ctx->Driver.Enable(ctx, GL_FRAMEBUFFER_SRGB, state);
 266    }
 267 }
 268
 269 /**
 270  * Helper function to enable or disable state.
 271  *
 272  * \param ctx GL context.
 273  * \param cap  the state to enable/disable
 274  * \param state whether to enable or disable the specified capability.
 275  *
 276  * Updates the current context and flushes the vertices as needed. For
 277  * capabilities associated with extensions it verifies that those extensions
 278  * are effectivly present before updating. Notifies the driver via
 279  * dd_function_table::Enable.
 280  */
 281 void
 282 _mesa_set_enable(struct gl_context *ctx, GLenum cap, GLboolean state)
 283 {
 284    if (MESA_VERBOSE & VERBOSE_API)
 285       _mesa_debug(ctx, "%s %s (newstate is %x)\n",
 286                   state ? "glEnable" : "glDisable",
 287                   _mesa_enum_to_string(cap),
 288                   ctx->NewState);
 289
 290    switch (cap) {
 291       case GL_ALPHA_TEST:
 292          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 293             goto invalid_enum_error;
 294          if (ctx->Color.AlphaEnabled == state)
 295             return;
 296          FLUSH_VERTICES(ctx, _NEW_COLOR);
 297          ctx->Color.AlphaEnabled = state;
 298          break;
 299       case GL_AUTO_NORMAL:
 300          if (ctx->API != API_OPENGL_COMPAT)
 301             goto invalid_enum_error;
 302          if (ctx->Eval.AutoNormal == state)
 303             return;
 304          FLUSH_VERTICES(ctx, _NEW_EVAL);
 305          ctx->Eval.AutoNormal = state;
 306          break;
 307       case GL_BLEND:
 308          {
 309             GLbitfield newEnabled =
 310                state * ((1 << ctx->Const.MaxDrawBuffers) - 1);
 311             if (newEnabled != ctx->Color.BlendEnabled) {
 312                FLUSH_VERTICES(ctx, _NEW_COLOR);
 313                ctx->Color.BlendEnabled = newEnabled;
 314             }
 315          }
 316          break;
 317       case GL_CLIP_DISTANCE0: /* aka GL_CLIP_PLANE0 */
 318       case GL_CLIP_DISTANCE1:
 319       case GL_CLIP_DISTANCE2:
 320       case GL_CLIP_DISTANCE3:
 321       case GL_CLIP_DISTANCE4:
 322       case GL_CLIP_DISTANCE5:
 323       case GL_CLIP_DISTANCE6:
 324       case GL_CLIP_DISTANCE7:
 325          {
 326             const GLuint p = cap - GL_CLIP_DISTANCE0;
 327
 328             if (p >= ctx->Const.MaxClipPlanes)
 329                goto invalid_enum_error;
 330
 331             if ((ctx->Transform.ClipPlanesEnabled & (1 << p))
 332                 == ((GLuint) state << p))
 333                return;
 334
 335             FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 336
 337             if (state) {
 338                ctx->Transform.ClipPlanesEnabled |= (1 << p);
 339                _mesa_update_clip_plane(ctx, p);
 340             }
 341             else {
 342                ctx->Transform.ClipPlanesEnabled &= ~(1 << p);
 343             }
 344          }
 345          break;
 346       case GL_COLOR_MATERIAL:
 347          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 348             goto invalid_enum_error;
 349          if (ctx->Light.ColorMaterialEnabled == state)
 350             return;
 351          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 352          FLUSH_CURRENT(ctx, 0);
 353          ctx->Light.ColorMaterialEnabled = state;
 354          if (state) {
 355             _mesa_update_color_material( ctx,
 356                                   ctx->Current.Attrib[VERT_ATTRIB_COLOR0] );
 357          }
 358          break;
 359       case GL_CULL_FACE:
 360          if (ctx->Polygon.CullFlag == state)
 361             return;
 362          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 363          ctx->Polygon.CullFlag = state;
 364          break;
 365       case GL_DEPTH_TEST:
 366          if (ctx->Depth.Test == state)
 367             return;
 368          FLUSH_VERTICES(ctx, _NEW_DEPTH);
 369          ctx->Depth.Test = state;
 370          break;
 371       case GL_DEBUG_OUTPUT:
 372       case GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB:
 373          _mesa_set_debug_state_int(ctx, cap, state);
 374          break;
 375       case GL_DITHER:
 376          if (ctx->Color.DitherFlag == state)
 377             return;
 378          FLUSH_VERTICES(ctx, _NEW_COLOR);
 379          ctx->Color.DitherFlag = state;
 380          break;
 381       case GL_FOG:
 382          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 383             goto invalid_enum_error;
 384          if (ctx->Fog.Enabled == state)
 385             return;
 386          FLUSH_VERTICES(ctx, _NEW_FOG);
 387          ctx->Fog.Enabled = state;
 388          ctx->Fog._PackedEnabledMode = state ? ctx->Fog._PackedMode : FOG_NONE;
 389          break;
 390       case GL_LIGHT0:
 391       case GL_LIGHT1:
 392       case GL_LIGHT2:
 393       case GL_LIGHT3:
 394       case GL_LIGHT4:
 395       case GL_LIGHT5:
 396       case GL_LIGHT6:
 397       case GL_LIGHT7:
 398          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 399             goto invalid_enum_error;
 400          if (ctx->Light.Light[cap-GL_LIGHT0].Enabled == state)
 401             return;
 402          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 403          ctx->Light.Light[cap-GL_LIGHT0].Enabled = state;
 404          if (state) {
 405             ctx->Light._EnabledLights |= 1u << (cap - GL_LIGHT0);
 406          }
 407          else {
 408             ctx->Light._EnabledLights &= ~(1u << (cap - GL_LIGHT0));
 409          }
 410          break;
 411       case GL_LIGHTING:
 412          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 413             goto invalid_enum_error;
 414          if (ctx->Light.Enabled == state)
 415             return;
 416          FLUSH_VERTICES(ctx, _NEW_LIGHT);
 417          ctx->Light.Enabled = state;
 418          break;
 419       case GL_LINE_SMOOTH:
 420          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
 421             goto invalid_enum_error;
 422          if (ctx->Line.SmoothFlag == state)
 423             return;
 424          FLUSH_VERTICES(ctx, _NEW_LINE);
 425          ctx->Line.SmoothFlag = state;
 426          break;
 427       case GL_LINE_STIPPLE:
 428          if (ctx->API != API_OPENGL_COMPAT)
 429             goto invalid_enum_error;
 430          if (ctx->Line.StippleFlag == state)
 431             return;
 432          FLUSH_VERTICES(ctx, _NEW_LINE);
 433          ctx->Line.StippleFlag = state;
 434          break;
 435       case GL_INDEX_LOGIC_OP:
 436          if (ctx->API != API_OPENGL_COMPAT)
 437             goto invalid_enum_error;
 438          if (ctx->Color.IndexLogicOpEnabled == state)
 439             return;
 440          FLUSH_VERTICES(ctx, _NEW_COLOR);
 441          ctx->Color.IndexLogicOpEnabled = state;
 442          break;
 443       case GL_CONSERVATIVE_RASTERIZATION_INTEL:
 444          if (!_mesa_has_INTEL_conservative_rasterization(ctx))
 445             goto invalid_enum_error;
 446          if (ctx->IntelConservativeRasterization == state)
 447             return;
 448          FLUSH_VERTICES(ctx, 0);
 449          ctx->NewDriverState |=
 450             ctx->DriverFlags.NewIntelConservativeRasterization;
 451          ctx->IntelConservativeRasterization = state;
 452          break;
 453       case GL_COLOR_LOGIC_OP:
 454          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
 455             goto invalid_enum_error;
 456          if (ctx->Color.ColorLogicOpEnabled == state)
 457             return;
 458          FLUSH_VERTICES(ctx, _NEW_COLOR);
 459          ctx->Color.ColorLogicOpEnabled = state;
 460          break;
 461       case GL_MAP1_COLOR_4:
 462          if (ctx->API != API_OPENGL_COMPAT)
 463             goto invalid_enum_error;
 464          if (ctx->Eval.Map1Color4 == state)
 465             return;
 466          FLUSH_VERTICES(ctx, _NEW_EVAL);
 467          ctx->Eval.Map1Color4 = state;
 468          break;
 469       case GL_MAP1_INDEX:
 470          if (ctx->API != API_OPENGL_COMPAT)
 471             goto invalid_enum_error;
 472          if (ctx->Eval.Map1Index == state)
 473             return;
 474          FLUSH_VERTICES(ctx, _NEW_EVAL);
 475          ctx->Eval.Map1Index = state;
 476          break;
 477       case GL_MAP1_NORMAL:
 478          if (ctx->API != API_OPENGL_COMPAT)
 479             goto invalid_enum_error;
 480          if (ctx->Eval.Map1Normal == state)
 481             return;
 482          FLUSH_VERTICES(ctx, _NEW_EVAL);
 483          ctx->Eval.Map1Normal = state;
 484          break;
 485       case GL_MAP1_TEXTURE_COORD_1:
 486          if (ctx->API != API_OPENGL_COMPAT)
 487             goto invalid_enum_error;
 488          if (ctx->Eval.Map1TextureCoord1 == state)
 489             return;
 490          FLUSH_VERTICES(ctx, _NEW_EVAL);
 491          ctx->Eval.Map1TextureCoord1 = state;
 492          break;
 493       case GL_MAP1_TEXTURE_COORD_2:
 494          if (ctx->API != API_OPENGL_COMPAT)
 495             goto invalid_enum_error;
 496          if (ctx->Eval.Map1TextureCoord2 == state)
 497             return;
 498          FLUSH_VERTICES(ctx, _NEW_EVAL);
 499          ctx->Eval.Map1TextureCoord2 = state;
 500          break;
 501       case GL_MAP1_TEXTURE_COORD_3:
 502          if (ctx->API != API_OPENGL_COMPAT)
 503             goto invalid_enum_error;
 504          if (ctx->Eval.Map1TextureCoord3 == state)
 505             return;
 506          FLUSH_VERTICES(ctx, _NEW_EVAL);
 507          ctx->Eval.Map1TextureCoord3 = state;
 508          break;
 509       case GL_MAP1_TEXTURE_COORD_4:
 510          if (ctx->API != API_OPENGL_COMPAT)
 511             goto invalid_enum_error;
 512          if (ctx->Eval.Map1TextureCoord4 == state)
 513             return;
 514          FLUSH_VERTICES(ctx, _NEW_EVAL);
 515          ctx->Eval.Map1TextureCoord4 = state;
 516          break;
 517       case GL_MAP1_VERTEX_3:
 518          if (ctx->API != API_OPENGL_COMPAT)
 519             goto invalid_enum_error;
 520          if (ctx->Eval.Map1Vertex3 == state)
 521             return;
 522          FLUSH_VERTICES(ctx, _NEW_EVAL);
 523          ctx->Eval.Map1Vertex3 = state;
 524          break;
 525       case GL_MAP1_VERTEX_4:
 526          if (ctx->API != API_OPENGL_COMPAT)
 527             goto invalid_enum_error;
 528          if (ctx->Eval.Map1Vertex4 == state)
 529             return;
 530          FLUSH_VERTICES(ctx, _NEW_EVAL);
 531          ctx->Eval.Map1Vertex4 = state;
 532          break;
 533       case GL_MAP2_COLOR_4:
 534          if (ctx->API != API_OPENGL_COMPAT)
 535             goto invalid_enum_error;
 536          if (ctx->Eval.Map2Color4 == state)
 537             return;
 538          FLUSH_VERTICES(ctx, _NEW_EVAL);
 539          ctx->Eval.Map2Color4 = state;
 540          break;
 541       case GL_MAP2_INDEX:
 542          if (ctx->API != API_OPENGL_COMPAT)
 543             goto invalid_enum_error;
 544          if (ctx->Eval.Map2Index == state)
 545             return;
 546          FLUSH_VERTICES(ctx, _NEW_EVAL);
 547          ctx->Eval.Map2Index = state;
 548          break;
 549       case GL_MAP2_NORMAL:
 550          if (ctx->API != API_OPENGL_COMPAT)
 551             goto invalid_enum_error;
 552          if (ctx->Eval.Map2Normal == state)
 553             return;
 554          FLUSH_VERTICES(ctx, _NEW_EVAL);
 555          ctx->Eval.Map2Normal = state;
 556          break;
 557       case GL_MAP2_TEXTURE_COORD_1:
 558          if (ctx->API != API_OPENGL_COMPAT)
 559             goto invalid_enum_error;
 560          if (ctx->Eval.Map2TextureCoord1 == state)
 561             return;
 562          FLUSH_VERTICES(ctx, _NEW_EVAL);
 563          ctx->Eval.Map2TextureCoord1 = state;
 564          break;
 565       case GL_MAP2_TEXTURE_COORD_2:
 566          if (ctx->API != API_OPENGL_COMPAT)
 567             goto invalid_enum_error;
 568          if (ctx->Eval.Map2TextureCoord2 == state)
 569             return;
 570          FLUSH_VERTICES(ctx, _NEW_EVAL);
 571          ctx->Eval.Map2TextureCoord2 = state;
 572          break;
 573       case GL_MAP2_TEXTURE_COORD_3:
 574          if (ctx->API != API_OPENGL_COMPAT)
 575             goto invalid_enum_error;
 576          if (ctx->Eval.Map2TextureCoord3 == state)
 577             return;
 578          FLUSH_VERTICES(ctx, _NEW_EVAL);
 579          ctx->Eval.Map2TextureCoord3 = state;
 580          break;
 581       case GL_MAP2_TEXTURE_COORD_4:
 582          if (ctx->API != API_OPENGL_COMPAT)
 583             goto invalid_enum_error;
 584          if (ctx->Eval.Map2TextureCoord4 == state)
 585             return;
 586          FLUSH_VERTICES(ctx, _NEW_EVAL);
 587          ctx->Eval.Map2TextureCoord4 = state;
 588          break;
 589       case GL_MAP2_VERTEX_3:
 590          if (ctx->API != API_OPENGL_COMPAT)
 591             goto invalid_enum_error;
 592          if (ctx->Eval.Map2Vertex3 == state)
 593             return;
 594          FLUSH_VERTICES(ctx, _NEW_EVAL);
 595          ctx->Eval.Map2Vertex3 = state;
 596          break;
 597       case GL_MAP2_VERTEX_4:
 598          if (ctx->API != API_OPENGL_COMPAT)
 599             goto invalid_enum_error;
 600          if (ctx->Eval.Map2Vertex4 == state)
 601             return;
 602          FLUSH_VERTICES(ctx, _NEW_EVAL);
 603          ctx->Eval.Map2Vertex4 = state;
 604          break;
 605       case GL_NORMALIZE:
 606          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 607             goto invalid_enum_error;
 608          if (ctx->Transform.Normalize == state)
 609             return;
 610          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 611          ctx->Transform.Normalize = state;
 612          break;
 613       case GL_POINT_SMOOTH:
 614          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 615             goto invalid_enum_error;
 616          if (ctx->Point.SmoothFlag == state)
 617             return;
 618          FLUSH_VERTICES(ctx, _NEW_POINT);
 619          ctx->Point.SmoothFlag = state;
 620          break;
 621       case GL_POLYGON_SMOOTH:
 622          if (!_mesa_is_desktop_gl(ctx))
 623             goto invalid_enum_error;
 624          if (ctx->Polygon.SmoothFlag == state)
 625             return;
 626          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 627          ctx->Polygon.SmoothFlag = state;
 628          break;
 629       case GL_POLYGON_STIPPLE:
 630          if (ctx->API != API_OPENGL_COMPAT)
 631             goto invalid_enum_error;
 632          if (ctx->Polygon.StippleFlag == state)
 633             return;
 634          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 635          ctx->Polygon.StippleFlag = state;
 636          break;
 637       case GL_POLYGON_OFFSET_POINT:
 638          if (!_mesa_is_desktop_gl(ctx))
 639             goto invalid_enum_error;
 640          if (ctx->Polygon.OffsetPoint == state)
 641             return;
 642          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 643          ctx->Polygon.OffsetPoint = state;
 644          break;
 645       case GL_POLYGON_OFFSET_LINE:
 646          if (!_mesa_is_desktop_gl(ctx))
 647             goto invalid_enum_error;
 648          if (ctx->Polygon.OffsetLine == state)
 649             return;
 650          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 651          ctx->Polygon.OffsetLine = state;
 652          break;
 653       case GL_POLYGON_OFFSET_FILL:
 654          if (ctx->Polygon.OffsetFill == state)
 655             return;
 656          FLUSH_VERTICES(ctx, _NEW_POLYGON);
 657          ctx->Polygon.OffsetFill = state;
 658          break;
 659       case GL_RESCALE_NORMAL_EXT:
 660          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 661             goto invalid_enum_error;
 662          if (ctx->Transform.RescaleNormals == state)
 663             return;
 664          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 665          ctx->Transform.RescaleNormals = state;
 666          break;
 667       case GL_SCISSOR_TEST:
 668          {
 669             /* Must expand glEnable to all scissors */
 670             GLbitfield newEnabled =
 671                state * ((1 << ctx->Const.MaxViewports) - 1);
 672             if (newEnabled != ctx->Scissor.EnableFlags) {
 673                FLUSH_VERTICES(ctx, _NEW_SCISSOR);
 674                ctx->Scissor.EnableFlags = newEnabled;
 675             }
 676          }
 677          break;
 678       case GL_STENCIL_TEST:
 679          if (ctx->Stencil.Enabled == state)
 680             return;
 681          FLUSH_VERTICES(ctx, _NEW_STENCIL);
 682          ctx->Stencil.Enabled = state;
 683          break;
 684       case GL_TEXTURE_1D:
 685          if (ctx->API != API_OPENGL_COMPAT)
 686             goto invalid_enum_error;
 687          if (!enable_texture(ctx, state, TEXTURE_1D_BIT)) {
 688             return;
 689          }
 690          break;
 691       case GL_TEXTURE_2D:
 692          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 693             goto invalid_enum_error;
 694          if (!enable_texture(ctx, state, TEXTURE_2D_BIT)) {
 695             return;
 696          }
 697          break;
 698       case GL_TEXTURE_3D:
 699          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 700             goto invalid_enum_error;
 701          if (!enable_texture(ctx, state, TEXTURE_3D_BIT)) {
 702             return;
 703          }
 704          break;
 705       case GL_TEXTURE_GEN_S:
 706       case GL_TEXTURE_GEN_T:
 707       case GL_TEXTURE_GEN_R:
 708       case GL_TEXTURE_GEN_Q:
 709          {
 710             struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 711
 712             if (ctx->API != API_OPENGL_COMPAT)
 713                goto invalid_enum_error;
 714
 715             if (texUnit) {
 716                GLbitfield coordBit = S_BIT << (cap - GL_TEXTURE_GEN_S);
 717                GLbitfield newenabled = texUnit->TexGenEnabled & ~coordBit;
 718                if (state)
 719                   newenabled |= coordBit;
 720                if (texUnit->TexGenEnabled == newenabled)
 721                   return;
 722                FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
 723                texUnit->TexGenEnabled = newenabled;
 724             }
 725          }
 726          break;
 727
 728       case GL_TEXTURE_GEN_STR_OES:
 729          /* disable S, T, and R at the same time */
 730          {
 731             struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
 732
 733             if (ctx->API != API_OPENGLES)
 734                goto invalid_enum_error;
 735
 736             if (texUnit) {
 737                GLuint newenabled =
 738                   texUnit->TexGenEnabled & ~STR_BITS;
 739                if (state)
 740                   newenabled |= STR_BITS;
 741                if (texUnit->TexGenEnabled == newenabled)
 742                   return;
 743                FLUSH_VERTICES(ctx, _NEW_TEXTURE_STATE);
 744                texUnit->TexGenEnabled = newenabled;
 745             }
 746          }
 747          break;
 748
 749       /* client-side state */
 750       case GL_VERTEX_ARRAY:
 751       case GL_NORMAL_ARRAY:
 752       case GL_COLOR_ARRAY:
 753       case GL_TEXTURE_COORD_ARRAY:
 754          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 755             goto invalid_enum_error;
 756          client_state( ctx, cap, state );
 757          return;
 758       case GL_INDEX_ARRAY:
 759       case GL_EDGE_FLAG_ARRAY:
 760       case GL_FOG_COORDINATE_ARRAY_EXT:
 761       case GL_SECONDARY_COLOR_ARRAY_EXT:
 762          if (ctx->API != API_OPENGL_COMPAT)
 763             goto invalid_enum_error;
 764          client_state( ctx, cap, state );
 765          return;
 766       case GL_POINT_SIZE_ARRAY_OES:
 767          if (ctx->API != API_OPENGLES)
 768             goto invalid_enum_error;
 769          client_state( ctx, cap, state );
 770          return;
 771
 772       /* GL_ARB_texture_cube_map */
 773       case GL_TEXTURE_CUBE_MAP:
 774          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 775             goto invalid_enum_error;
 776          CHECK_EXTENSION(ARB_texture_cube_map, cap);
 777          if (!enable_texture(ctx, state, TEXTURE_CUBE_BIT)) {
 778             return;
 779          }
 780          break;
 781
 782       /* GL_EXT_secondary_color */
 783       case GL_COLOR_SUM_EXT:
 784          if (ctx->API != API_OPENGL_COMPAT)
 785             goto invalid_enum_error;
 786          if (ctx->Fog.ColorSumEnabled == state)
 787             return;
 788          FLUSH_VERTICES(ctx, _NEW_FOG);
 789          ctx->Fog.ColorSumEnabled = state;
 790          break;
 791
 792       /* GL_ARB_multisample */
 793       case GL_MULTISAMPLE_ARB:
 794          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
 795             goto invalid_enum_error;
 796          _mesa_set_multisample(ctx, state);
 797          return;
 798       case GL_SAMPLE_ALPHA_TO_COVERAGE_ARB:
 799          if (ctx->Multisample.SampleAlphaToCoverage == state)
 800             return;
 801          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 802          ctx->Multisample.SampleAlphaToCoverage = state;
 803          break;
 804       case GL_SAMPLE_ALPHA_TO_ONE_ARB:
 805          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
 806             goto invalid_enum_error;
 807          if (ctx->Multisample.SampleAlphaToOne == state)
 808             return;
 809          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 810          ctx->Multisample.SampleAlphaToOne = state;
 811          break;
 812       case GL_SAMPLE_COVERAGE_ARB:
 813          if (ctx->Multisample.SampleCoverage == state)
 814             return;
 815          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 816          ctx->Multisample.SampleCoverage = state;
 817          break;
 818       case GL_SAMPLE_COVERAGE_INVERT_ARB:
 819          if (!_mesa_is_desktop_gl(ctx))
 820             goto invalid_enum_error;
 821          if (ctx->Multisample.SampleCoverageInvert == state)
 822             return;
 823          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 824          ctx->Multisample.SampleCoverageInvert = state;
 825          break;
 826
 827       /* GL_ARB_sample_shading */
 828       case GL_SAMPLE_SHADING:
 829          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
 830             goto invalid_enum_error;
 831          CHECK_EXTENSION(ARB_sample_shading, cap);
 832          if (ctx->Multisample.SampleShading == state)
 833             return;
 834          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
 835          ctx->Multisample.SampleShading = state;
 836          break;
 837
 838       /* GL_IBM_rasterpos_clip */
 839       case GL_RASTER_POSITION_UNCLIPPED_IBM:
 840          if (ctx->API != API_OPENGL_COMPAT)
 841             goto invalid_enum_error;
 842          if (ctx->Transform.RasterPositionUnclipped == state)
 843             return;
 844          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 845          ctx->Transform.RasterPositionUnclipped = state;
 846          break;
 847
 848       /* GL_NV_point_sprite */
 849       case GL_POINT_SPRITE_NV:
 850          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
 851             goto invalid_enum_error;
 852          CHECK_EXTENSION2(NV_point_sprite, ARB_point_sprite, cap);
 853          if (ctx->Point.PointSprite == state)
 854             return;
 855          FLUSH_VERTICES(ctx, _NEW_POINT);
 856          ctx->Point.PointSprite = state;
 857          break;
 858
 859       case GL_VERTEX_PROGRAM_ARB:
 860          if (ctx->API != API_OPENGL_COMPAT)
 861             goto invalid_enum_error;
 862          CHECK_EXTENSION(ARB_vertex_program, cap);
 863          if (ctx->VertexProgram.Enabled == state)
 864             return;
 865          FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 866          ctx->VertexProgram.Enabled = state;
 867          break;
 868       case GL_VERTEX_PROGRAM_POINT_SIZE_ARB:
 869          /* This was added with ARB_vertex_program, but it is also used with
 870           * GLSL vertex shaders on desktop.
 871           */
 872          if (!_mesa_is_desktop_gl(ctx))
 873             goto invalid_enum_error;
 874          CHECK_EXTENSION(ARB_vertex_program, cap);
 875          if (ctx->VertexProgram.PointSizeEnabled == state)
 876             return;
 877          FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 878          ctx->VertexProgram.PointSizeEnabled = state;
 879          break;
 880       case GL_VERTEX_PROGRAM_TWO_SIDE_ARB:
 881          if (ctx->API != API_OPENGL_COMPAT)
 882             goto invalid_enum_error;
 883          CHECK_EXTENSION(ARB_vertex_program, cap);
 884          if (ctx->VertexProgram.TwoSideEnabled == state)
 885             return;
 886          FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 887          ctx->VertexProgram.TwoSideEnabled = state;
 888          break;
 889
 890       /* GL_NV_texture_rectangle */
 891       case GL_TEXTURE_RECTANGLE_NV:
 892          if (ctx->API != API_OPENGL_COMPAT)
 893             goto invalid_enum_error;
 894          CHECK_EXTENSION(NV_texture_rectangle, cap);
 895          if (!enable_texture(ctx, state, TEXTURE_RECT_BIT)) {
 896             return;
 897          }
 898          break;
 899
 900       /* GL_EXT_stencil_two_side */
 901       case GL_STENCIL_TEST_TWO_SIDE_EXT:
 902          if (ctx->API != API_OPENGL_COMPAT)
 903             goto invalid_enum_error;
 904          CHECK_EXTENSION(EXT_stencil_two_side, cap);
 905          if (ctx->Stencil.TestTwoSide == state)
 906             return;
 907          FLUSH_VERTICES(ctx, _NEW_STENCIL);
 908          ctx->Stencil.TestTwoSide = state;
 909          if (state) {
 910             ctx->Stencil._BackFace = 2;
 911          } else {
 912             ctx->Stencil._BackFace = 1;
 913          }
 914          break;
 915
 916       case GL_FRAGMENT_PROGRAM_ARB:
 917          if (ctx->API != API_OPENGL_COMPAT)
 918             goto invalid_enum_error;
 919          CHECK_EXTENSION(ARB_fragment_program, cap);
 920          if (ctx->FragmentProgram.Enabled == state)
 921             return;
 922          FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 923          ctx->FragmentProgram.Enabled = state;
 924          break;
 925
 926       /* GL_EXT_depth_bounds_test */
 927       case GL_DEPTH_BOUNDS_TEST_EXT:
 928          if (!_mesa_is_desktop_gl(ctx))
 929             goto invalid_enum_error;
 930          CHECK_EXTENSION(EXT_depth_bounds_test, cap);
 931          if (ctx->Depth.BoundsTest == state)
 932             return;
 933          FLUSH_VERTICES(ctx, _NEW_DEPTH);
 934          ctx->Depth.BoundsTest = state;
 935          break;
 936
 937       case GL_DEPTH_CLAMP:
 938          if (!_mesa_is_desktop_gl(ctx))
 939             goto invalid_enum_error;
 940          CHECK_EXTENSION(ARB_depth_clamp, cap);
 941          if (ctx->Transform.DepthClamp == state)
 942             return;
 943          FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 944          ctx->Transform.DepthClamp = state;
 945          break;
 946
 947       case GL_FRAGMENT_SHADER_ATI:
 948          if (ctx->API != API_OPENGL_COMPAT)
 949             goto invalid_enum_error;
 950         CHECK_EXTENSION(ATI_fragment_shader, cap);
 951         if (ctx->ATIFragmentShader.Enabled == state)
 952           return;
 953         FLUSH_VERTICES(ctx, _NEW_PROGRAM);
 954         ctx->ATIFragmentShader.Enabled = state;
 955         break;
 956
 957       case GL_TEXTURE_CUBE_MAP_SEAMLESS:
 958          if (!_mesa_is_desktop_gl(ctx))
 959             goto invalid_enum_error;
 960          CHECK_EXTENSION(ARB_seamless_cube_map, cap);
 961          if (ctx->Texture.CubeMapSeamless != state) {
 962             FLUSH_VERTICES(ctx, _NEW_TEXTURE_OBJECT);
 963             ctx->Texture.CubeMapSeamless = state;
 964          }
 965          break;
 966
 967       case GL_RASTERIZER_DISCARD:
 968          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
 969             goto invalid_enum_error;
 970          CHECK_EXTENSION(EXT_transform_feedback, cap);
 971          if (ctx->RasterDiscard != state) {
 972             FLUSH_VERTICES(ctx, 0);
 973             ctx->NewDriverState |= ctx->DriverFlags.NewRasterizerDiscard;
 974             ctx->RasterDiscard = state;
 975          }
 976          break;
 977
 978       /* GL 3.1 primitive restart.  Note: this enum is different from
 979        * GL_PRIMITIVE_RESTART_NV (which is client state).
 980        */
 981       case GL_PRIMITIVE_RESTART:
 982          if (!_mesa_is_desktop_gl(ctx) || ctx->Version < 31) {
 983             goto invalid_enum_error;
 984          }
 985          if (ctx->Array.PrimitiveRestart != state) {
 986             FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 987             ctx->Array.PrimitiveRestart = state;
 988             update_derived_primitive_restart_state(ctx);
 989          }
 990          break;
 991
 992       case GL_PRIMITIVE_RESTART_FIXED_INDEX:
 993          if (!_mesa_is_gles3(ctx) && !ctx->Extensions.ARB_ES3_compatibility)
 994             goto invalid_enum_error;
 995          if (ctx->Array.PrimitiveRestartFixedIndex != state) {
 996             FLUSH_VERTICES(ctx, _NEW_TRANSFORM);
 997             ctx->Array.PrimitiveRestartFixedIndex = state;
 998             update_derived_primitive_restart_state(ctx);
 999          }
1000          break;
1001
1002       /* GL3.0 - GL_framebuffer_sRGB */
1003       case GL_FRAMEBUFFER_SRGB_EXT:
1004          if (!_mesa_is_desktop_gl(ctx))
1005             goto invalid_enum_error;
1006          CHECK_EXTENSION(EXT_framebuffer_sRGB, cap);
1007          _mesa_set_framebuffer_srgb(ctx, state);
1008          return;
1009
1010       /* GL_OES_EGL_image_external */
1011       case GL_TEXTURE_EXTERNAL_OES:
1012          if (!_mesa_is_gles(ctx))
1013             goto invalid_enum_error;
1014          CHECK_EXTENSION(OES_EGL_image_external, cap);
1015          if (!enable_texture(ctx, state, TEXTURE_EXTERNAL_BIT)) {
1016             return;
1017          }
1018          break;
1019
1020       /* ARB_texture_multisample */
1021       case GL_SAMPLE_MASK:
1022          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles31(ctx))
1023             goto invalid_enum_error;
1024          CHECK_EXTENSION(ARB_texture_multisample, cap);
1025          if (ctx->Multisample.SampleMask == state)
1026             return;
1027          FLUSH_VERTICES(ctx, _NEW_MULTISAMPLE);
1028          ctx->Multisample.SampleMask = state;
1029          break;
1030
1031       case GL_BLEND_ADVANCED_COHERENT_KHR:
1032          CHECK_EXTENSION(KHR_blend_equation_advanced_coherent, cap);
1033          if (ctx->Color.BlendCoherent == state)
1034             return;
1035          FLUSH_VERTICES(ctx, _NEW_COLOR);
1036          ctx->Color.BlendCoherent = state;
1037          break;
1038
1039       default:
1040          goto invalid_enum_error;
1041    }
1042
1043    if (ctx->Driver.Enable) {
1044       ctx->Driver.Enable( ctx, cap, state );
1045    }
1046
1047    return;
1048
1049 invalid_enum_error:
1050    _mesa_error(ctx, GL_INVALID_ENUM, "gl%s(%s)",
1051                state ? "Enable" : "Disable", _mesa_enum_to_string(cap));
1052 }
1053
1054
1055 /**
1056  * Enable GL capability.  Called by glEnable()
1057  * \param cap  state to enable.
1058  */
1059 void GLAPIENTRY
1060 _mesa_Enable( GLenum cap )
1061 {
1062    GET_CURRENT_CONTEXT(ctx);
1063
1064    _mesa_set_enable( ctx, cap, GL_TRUE );
1065 }
1066
1067
1068 /**
1069  * Disable GL capability.  Called by glDisable()
1070  * \param cap  state to disable.
1071  */
1072 void GLAPIENTRY
1073 _mesa_Disable( GLenum cap )
1074 {
1075    GET_CURRENT_CONTEXT(ctx);
1076
1077    _mesa_set_enable( ctx, cap, GL_FALSE );
1078 }
1079
1080
1081
1082 /**
1083  * Enable/disable an indexed state var.
1084  */
1085 void
1086 _mesa_set_enablei(struct gl_context *ctx, GLenum cap,
1087                   GLuint index, GLboolean state)
1088 {
1089    assert(state == 0 || state == 1);
1090    switch (cap) {
1091    case GL_BLEND:
1092       if (!ctx->Extensions.EXT_draw_buffers2) {
1093          goto invalid_enum_error;
1094       }
1095       if (index >= ctx->Const.MaxDrawBuffers) {
1096          _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%u)",
1097                      state ? "glEnableIndexed" : "glDisableIndexed", index);
1098          return;
1099       }
1100       if (((ctx->Color.BlendEnabled >> index) & 1) != state) {
1101          FLUSH_VERTICES(ctx, _NEW_COLOR);
1102          if (state)
1103             ctx->Color.BlendEnabled |= (1 << index);
1104          else
1105             ctx->Color.BlendEnabled &= ~(1 << index);
1106       }
1107       break;
1108    case GL_SCISSOR_TEST:
1109       if (index >= ctx->Const.MaxViewports) {
1110          _mesa_error(ctx, GL_INVALID_VALUE, "%s(index=%u)",
1111                      state ? "glEnablei" : "glDisablei", index);
1112          return;
1113       }
1114       if (((ctx->Scissor.EnableFlags >> index) & 1) != state) {
1115          FLUSH_VERTICES(ctx, _NEW_SCISSOR);
1116          if (state)
1117             ctx->Scissor.EnableFlags |= (1 << index);
1118          else
1119             ctx->Scissor.EnableFlags &= ~(1 << index);
1120       }
1121       break;
1122    default:
1123       goto invalid_enum_error;
1124    }
1125    return;
1126
1127 invalid_enum_error:
1128     _mesa_error(ctx, GL_INVALID_ENUM, "%s(cap=%s)",
1129                 state ? "glEnablei" : "glDisablei",
1130                 _mesa_enum_to_string(cap));
1131 }
1132
1133
1134 void GLAPIENTRY
1135 _mesa_Disablei( GLenum cap, GLuint index )
1136 {
1137    GET_CURRENT_CONTEXT(ctx);
1138    _mesa_set_enablei(ctx, cap, index, GL_FALSE);
1139 }
1140
1141
1142 void GLAPIENTRY
1143 _mesa_Enablei( GLenum cap, GLuint index )
1144 {
1145    GET_CURRENT_CONTEXT(ctx);
1146    _mesa_set_enablei(ctx, cap, index, GL_TRUE);
1147 }
1148
1149
1150 GLboolean GLAPIENTRY
1151 _mesa_IsEnabledi( GLenum cap, GLuint index )
1152 {
1153    GET_CURRENT_CONTEXT(ctx);
1154    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
1155    switch (cap) {
1156    case GL_BLEND:
1157       if (index >= ctx->Const.MaxDrawBuffers) {
1158          _mesa_error(ctx, GL_INVALID_VALUE, "glIsEnabledIndexed(index=%u)",
1159                      index);
1160          return GL_FALSE;
1161       }
1162       return (ctx->Color.BlendEnabled >> index) & 1;
1163    case GL_SCISSOR_TEST:
1164       if (index >= ctx->Const.MaxViewports) {
1165          _mesa_error(ctx, GL_INVALID_VALUE, "glIsEnabledIndexed(index=%u)",
1166                      index);
1167          return GL_FALSE;
1168       }
1169       return (ctx->Scissor.EnableFlags >> index) & 1;
1170    default:
1171       _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabledIndexed(cap=%s)",
1172                   _mesa_enum_to_string(cap));
1173       return GL_FALSE;
1174    }
1175 }
1176
1177
1178
1179
1180 #undef CHECK_EXTENSION
1181 #define CHECK_EXTENSION(EXTNAME)                        \
1182    if (!ctx->Extensions.EXTNAME) {                      \
1183       goto invalid_enum_error;                          \
1184    }
1185
1186 #undef CHECK_EXTENSION2
1187 #define CHECK_EXTENSION2(EXT1, EXT2)                            \
1188    if (!ctx->Extensions.EXT1 && !ctx->Extensions.EXT2) {        \
1189       goto invalid_enum_error;                                  \
1190    }
1191
1192
1193 /**
1194  * Helper function to determine whether a texture target is enabled.
1195  */
1196 static GLboolean
1197 is_texture_enabled(struct gl_context *ctx, GLbitfield bit)
1198 {
1199    const struct gl_texture_unit *const texUnit =
1200        &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
1201    return (texUnit->Enabled & bit) ? GL_TRUE : GL_FALSE;
1202 }
1203
1204
1205 /**
1206  * Return simple enable/disable state.
1207  *
1208  * \param cap  state variable to query.
1209  *
1210  * Returns the state of the specified capability from the current GL context.
1211  * For the capabilities associated with extensions verifies that those
1212  * extensions are effectively present before reporting.
1213  */
1214 GLboolean GLAPIENTRY
1215 _mesa_IsEnabled( GLenum cap )
1216 {
1217    GET_CURRENT_CONTEXT(ctx);
1218    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, 0);
1219
1220    switch (cap) {
1221       case GL_ALPHA_TEST:
1222          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1223             goto invalid_enum_error;
1224          return ctx->Color.AlphaEnabled;
1225       case GL_AUTO_NORMAL:
1226          if (ctx->API != API_OPENGL_COMPAT)
1227             goto invalid_enum_error;
1228          return ctx->Eval.AutoNormal;
1229       case GL_BLEND:
1230          return ctx->Color.BlendEnabled & 1;  /* return state for buffer[0] */
1231       case GL_CLIP_DISTANCE0: /* aka GL_CLIP_PLANE0 */
1232       case GL_CLIP_DISTANCE1:
1233       case GL_CLIP_DISTANCE2:
1234       case GL_CLIP_DISTANCE3:
1235       case GL_CLIP_DISTANCE4:
1236       case GL_CLIP_DISTANCE5:
1237       case GL_CLIP_DISTANCE6:
1238       case GL_CLIP_DISTANCE7: {
1239          const GLuint p = cap - GL_CLIP_DISTANCE0;
1240
1241          if (p >= ctx->Const.MaxClipPlanes)
1242             goto invalid_enum_error;
1243
1244          return (ctx->Transform.ClipPlanesEnabled >> p) & 1;
1245       }
1246       case GL_COLOR_MATERIAL:
1247          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1248             goto invalid_enum_error;
1249          return ctx->Light.ColorMaterialEnabled;
1250       case GL_CULL_FACE:
1251          return ctx->Polygon.CullFlag;
1252       case GL_DEBUG_OUTPUT:
1253       case GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB:
1254          return (GLboolean) _mesa_get_debug_state_int(ctx, cap);
1255       case GL_DEPTH_TEST:
1256          return ctx->Depth.Test;
1257       case GL_DITHER:
1258          return ctx->Color.DitherFlag;
1259       case GL_FOG:
1260          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1261             goto invalid_enum_error;
1262          return ctx->Fog.Enabled;
1263       case GL_LIGHTING:
1264          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1265             goto invalid_enum_error;
1266          return ctx->Light.Enabled;
1267       case GL_LIGHT0:
1268       case GL_LIGHT1:
1269       case GL_LIGHT2:
1270       case GL_LIGHT3:
1271       case GL_LIGHT4:
1272       case GL_LIGHT5:
1273       case GL_LIGHT6:
1274       case GL_LIGHT7:
1275          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1276             goto invalid_enum_error;
1277          return ctx->Light.Light[cap-GL_LIGHT0].Enabled;
1278       case GL_LINE_SMOOTH:
1279          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
1280             goto invalid_enum_error;
1281          return ctx->Line.SmoothFlag;
1282       case GL_LINE_STIPPLE:
1283          if (ctx->API != API_OPENGL_COMPAT)
1284             goto invalid_enum_error;
1285          return ctx->Line.StippleFlag;
1286       case GL_INDEX_LOGIC_OP:
1287          if (ctx->API != API_OPENGL_COMPAT)
1288             goto invalid_enum_error;
1289          return ctx->Color.IndexLogicOpEnabled;
1290       case GL_COLOR_LOGIC_OP:
1291          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
1292             goto invalid_enum_error;
1293          return ctx->Color.ColorLogicOpEnabled;
1294       case GL_MAP1_COLOR_4:
1295          if (ctx->API != API_OPENGL_COMPAT)
1296             goto invalid_enum_error;
1297          return ctx->Eval.Map1Color4;
1298       case GL_MAP1_INDEX:
1299          if (ctx->API != API_OPENGL_COMPAT)
1300             goto invalid_enum_error;
1301          return ctx->Eval.Map1Index;
1302       case GL_MAP1_NORMAL:
1303          if (ctx->API != API_OPENGL_COMPAT)
1304             goto invalid_enum_error;
1305          return ctx->Eval.Map1Normal;
1306       case GL_MAP1_TEXTURE_COORD_1:
1307          if (ctx->API != API_OPENGL_COMPAT)
1308             goto invalid_enum_error;
1309          return ctx->Eval.Map1TextureCoord1;
1310       case GL_MAP1_TEXTURE_COORD_2:
1311          if (ctx->API != API_OPENGL_COMPAT)
1312             goto invalid_enum_error;
1313          return ctx->Eval.Map1TextureCoord2;
1314       case GL_MAP1_TEXTURE_COORD_3:
1315          if (ctx->API != API_OPENGL_COMPAT)
1316             goto invalid_enum_error;
1317          return ctx->Eval.Map1TextureCoord3;
1318       case GL_MAP1_TEXTURE_COORD_4:
1319          if (ctx->API != API_OPENGL_COMPAT)
1320             goto invalid_enum_error;
1321          return ctx->Eval.Map1TextureCoord4;
1322       case GL_MAP1_VERTEX_3:
1323          if (ctx->API != API_OPENGL_COMPAT)
1324             goto invalid_enum_error;
1325          return ctx->Eval.Map1Vertex3;
1326       case GL_MAP1_VERTEX_4:
1327          if (ctx->API != API_OPENGL_COMPAT)
1328             goto invalid_enum_error;
1329          return ctx->Eval.Map1Vertex4;
1330       case GL_MAP2_COLOR_4:
1331          if (ctx->API != API_OPENGL_COMPAT)
1332             goto invalid_enum_error;
1333          return ctx->Eval.Map2Color4;
1334       case GL_MAP2_INDEX:
1335          if (ctx->API != API_OPENGL_COMPAT)
1336             goto invalid_enum_error;
1337          return ctx->Eval.Map2Index;
1338       case GL_MAP2_NORMAL:
1339          if (ctx->API != API_OPENGL_COMPAT)
1340             goto invalid_enum_error;
1341          return ctx->Eval.Map2Normal;
1342       case GL_MAP2_TEXTURE_COORD_1:
1343          if (ctx->API != API_OPENGL_COMPAT)
1344             goto invalid_enum_error;
1345          return ctx->Eval.Map2TextureCoord1;
1346       case GL_MAP2_TEXTURE_COORD_2:
1347          if (ctx->API != API_OPENGL_COMPAT)
1348             goto invalid_enum_error;
1349          return ctx->Eval.Map2TextureCoord2;
1350       case GL_MAP2_TEXTURE_COORD_3:
1351          if (ctx->API != API_OPENGL_COMPAT)
1352             goto invalid_enum_error;
1353          return ctx->Eval.Map2TextureCoord3;
1354       case GL_MAP2_TEXTURE_COORD_4:
1355          if (ctx->API != API_OPENGL_COMPAT)
1356             goto invalid_enum_error;
1357          return ctx->Eval.Map2TextureCoord4;
1358       case GL_MAP2_VERTEX_3:
1359          if (ctx->API != API_OPENGL_COMPAT)
1360             goto invalid_enum_error;
1361          return ctx->Eval.Map2Vertex3;
1362       case GL_MAP2_VERTEX_4:
1363          if (ctx->API != API_OPENGL_COMPAT)
1364             goto invalid_enum_error;
1365          return ctx->Eval.Map2Vertex4;
1366       case GL_NORMALIZE:
1367          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1368             goto invalid_enum_error;
1369          return ctx->Transform.Normalize;
1370       case GL_POINT_SMOOTH:
1371          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1372             goto invalid_enum_error;
1373          return ctx->Point.SmoothFlag;
1374       case GL_POLYGON_SMOOTH:
1375          if (!_mesa_is_desktop_gl(ctx))
1376             goto invalid_enum_error;
1377          return ctx->Polygon.SmoothFlag;
1378       case GL_POLYGON_STIPPLE:
1379          if (ctx->API != API_OPENGL_COMPAT)
1380             goto invalid_enum_error;
1381          return ctx->Polygon.StippleFlag;
1382       case GL_POLYGON_OFFSET_POINT:
1383          if (!_mesa_is_desktop_gl(ctx))
1384             goto invalid_enum_error;
1385          return ctx->Polygon.OffsetPoint;
1386       case GL_POLYGON_OFFSET_LINE:
1387          if (!_mesa_is_desktop_gl(ctx))
1388             goto invalid_enum_error;
1389          return ctx->Polygon.OffsetLine;
1390       case GL_POLYGON_OFFSET_FILL:
1391          return ctx->Polygon.OffsetFill;
1392       case GL_RESCALE_NORMAL_EXT:
1393          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1394             goto invalid_enum_error;
1395          return ctx->Transform.RescaleNormals;
1396       case GL_SCISSOR_TEST:
1397          return ctx->Scissor.EnableFlags & 1;  /* return state for index 0 */
1398       case GL_STENCIL_TEST:
1399          return ctx->Stencil.Enabled;
1400       case GL_TEXTURE_1D:
1401          if (ctx->API != API_OPENGL_COMPAT)
1402             goto invalid_enum_error;
1403          return is_texture_enabled(ctx, TEXTURE_1D_BIT);
1404       case GL_TEXTURE_2D:
1405          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1406             goto invalid_enum_error;
1407          return is_texture_enabled(ctx, TEXTURE_2D_BIT);
1408       case GL_TEXTURE_3D:
1409          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1410             goto invalid_enum_error;
1411          return is_texture_enabled(ctx, TEXTURE_3D_BIT);
1412       case GL_TEXTURE_GEN_S:
1413       case GL_TEXTURE_GEN_T:
1414       case GL_TEXTURE_GEN_R:
1415       case GL_TEXTURE_GEN_Q:
1416          {
1417             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1418
1419             if (ctx->API != API_OPENGL_COMPAT)
1420                goto invalid_enum_error;
1421
1422             if (texUnit) {
1423                GLbitfield coordBit = S_BIT << (cap - GL_TEXTURE_GEN_S);
1424                return (texUnit->TexGenEnabled & coordBit) ? GL_TRUE : GL_FALSE;
1425             }
1426          }
1427          return GL_FALSE;
1428       case GL_TEXTURE_GEN_STR_OES:
1429          {
1430             const struct gl_texture_unit *texUnit = get_texcoord_unit(ctx);
1431
1432             if (ctx->API != API_OPENGLES)
1433                goto invalid_enum_error;
1434
1435             if (texUnit) {
1436                return (texUnit->TexGenEnabled & STR_BITS) == STR_BITS
1437                   ? GL_TRUE : GL_FALSE;
1438             }
1439          }
1440
1441       /* client-side state */
1442       case GL_VERTEX_ARRAY:
1443          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1444             goto invalid_enum_error;
1445          return ctx->Array.VAO->VertexAttrib[VERT_ATTRIB_POS].Enabled;
1446       case GL_NORMAL_ARRAY:
1447          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1448             goto invalid_enum_error;
1449          return ctx->Array.VAO->VertexAttrib[VERT_ATTRIB_NORMAL].Enabled;
1450       case GL_COLOR_ARRAY:
1451          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1452             goto invalid_enum_error;
1453          return ctx->Array.VAO->VertexAttrib[VERT_ATTRIB_COLOR0].Enabled;
1454       case GL_INDEX_ARRAY:
1455          if (ctx->API != API_OPENGL_COMPAT)
1456             goto invalid_enum_error;
1457          return ctx->Array.VAO->
1458             VertexAttrib[VERT_ATTRIB_COLOR_INDEX].Enabled;
1459       case GL_TEXTURE_COORD_ARRAY:
1460          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1461             goto invalid_enum_error;
1462          return ctx->Array.VAO->
1463             VertexAttrib[VERT_ATTRIB_TEX(ctx->Array.ActiveTexture)].Enabled;
1464       case GL_EDGE_FLAG_ARRAY:
1465          if (ctx->API != API_OPENGL_COMPAT)
1466             goto invalid_enum_error;
1467          return ctx->Array.VAO->VertexAttrib[VERT_ATTRIB_EDGEFLAG].Enabled;
1468       case GL_FOG_COORDINATE_ARRAY_EXT:
1469          if (ctx->API != API_OPENGL_COMPAT)
1470             goto invalid_enum_error;
1471          return ctx->Array.VAO->VertexAttrib[VERT_ATTRIB_FOG].Enabled;
1472       case GL_SECONDARY_COLOR_ARRAY_EXT:
1473          if (ctx->API != API_OPENGL_COMPAT)
1474             goto invalid_enum_error;
1475          return ctx->Array.VAO->VertexAttrib[VERT_ATTRIB_COLOR1].Enabled;
1476       case GL_POINT_SIZE_ARRAY_OES:
1477          if (ctx->API != API_OPENGLES)
1478             goto invalid_enum_error;
1479          return ctx->Array.VAO->VertexAttrib[VERT_ATTRIB_POINT_SIZE].Enabled;
1480
1481       /* GL_ARB_texture_cube_map */
1482       case GL_TEXTURE_CUBE_MAP:
1483          CHECK_EXTENSION(ARB_texture_cube_map);
1484          return is_texture_enabled(ctx, TEXTURE_CUBE_BIT);
1485
1486       /* GL_EXT_secondary_color */
1487       case GL_COLOR_SUM_EXT:
1488          if (ctx->API != API_OPENGL_COMPAT)
1489             goto invalid_enum_error;
1490          return ctx->Fog.ColorSumEnabled;
1491
1492       /* GL_ARB_multisample */
1493       case GL_MULTISAMPLE_ARB:
1494          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
1495             goto invalid_enum_error;
1496          return ctx->Multisample.Enabled;
1497       case GL_SAMPLE_ALPHA_TO_COVERAGE_ARB:
1498          return ctx->Multisample.SampleAlphaToCoverage;
1499       case GL_SAMPLE_ALPHA_TO_ONE_ARB:
1500          if (!_mesa_is_desktop_gl(ctx) && ctx->API != API_OPENGLES)
1501             goto invalid_enum_error;
1502          return ctx->Multisample.SampleAlphaToOne;
1503       case GL_SAMPLE_COVERAGE_ARB:
1504          return ctx->Multisample.SampleCoverage;
1505       case GL_SAMPLE_COVERAGE_INVERT_ARB:
1506          if (!_mesa_is_desktop_gl(ctx))
1507             goto invalid_enum_error;
1508          return ctx->Multisample.SampleCoverageInvert;
1509
1510       /* GL_IBM_rasterpos_clip */
1511       case GL_RASTER_POSITION_UNCLIPPED_IBM:
1512          if (ctx->API != API_OPENGL_COMPAT)
1513             goto invalid_enum_error;
1514          return ctx->Transform.RasterPositionUnclipped;
1515
1516       /* GL_NV_point_sprite */
1517       case GL_POINT_SPRITE_NV:
1518          if (ctx->API != API_OPENGL_COMPAT && ctx->API != API_OPENGLES)
1519             goto invalid_enum_error;
1520          CHECK_EXTENSION2(NV_point_sprite, ARB_point_sprite)
1521          return ctx->Point.PointSprite;
1522
1523       case GL_VERTEX_PROGRAM_ARB:
1524          if (ctx->API != API_OPENGL_COMPAT)
1525             goto invalid_enum_error;
1526          CHECK_EXTENSION(ARB_vertex_program);
1527          return ctx->VertexProgram.Enabled;
1528       case GL_VERTEX_PROGRAM_POINT_SIZE_ARB:
1529          /* This was added with ARB_vertex_program, but it is also used with
1530           * GLSL vertex shaders on desktop.
1531           */
1532          if (!_mesa_is_desktop_gl(ctx))
1533             goto invalid_enum_error;
1534          CHECK_EXTENSION(ARB_vertex_program);
1535          return ctx->VertexProgram.PointSizeEnabled;
1536       case GL_VERTEX_PROGRAM_TWO_SIDE_ARB:
1537          if (ctx->API != API_OPENGL_COMPAT)
1538             goto invalid_enum_error;
1539          CHECK_EXTENSION(ARB_vertex_program);
1540          return ctx->VertexProgram.TwoSideEnabled;
1541
1542       /* GL_NV_texture_rectangle */
1543       case GL_TEXTURE_RECTANGLE_NV:
1544          if (ctx->API != API_OPENGL_COMPAT)
1545             goto invalid_enum_error;
1546          CHECK_EXTENSION(NV_texture_rectangle);
1547          return is_texture_enabled(ctx, TEXTURE_RECT_BIT);
1548
1549       /* GL_EXT_stencil_two_side */
1550       case GL_STENCIL_TEST_TWO_SIDE_EXT:
1551          if (ctx->API != API_OPENGL_COMPAT)
1552             goto invalid_enum_error;
1553          CHECK_EXTENSION(EXT_stencil_two_side);
1554          return ctx->Stencil.TestTwoSide;
1555
1556       case GL_FRAGMENT_PROGRAM_ARB:
1557          if (ctx->API != API_OPENGL_COMPAT)
1558             goto invalid_enum_error;
1559          return ctx->FragmentProgram.Enabled;
1560
1561       /* GL_EXT_depth_bounds_test */
1562       case GL_DEPTH_BOUNDS_TEST_EXT:
1563          if (!_mesa_is_desktop_gl(ctx))
1564             goto invalid_enum_error;
1565          CHECK_EXTENSION(EXT_depth_bounds_test);
1566          return ctx->Depth.BoundsTest;
1567
1568       /* GL_ARB_depth_clamp */
1569       case GL_DEPTH_CLAMP:
1570          if (!_mesa_is_desktop_gl(ctx))
1571             goto invalid_enum_error;
1572          CHECK_EXTENSION(ARB_depth_clamp);
1573          return ctx->Transform.DepthClamp;
1574
1575       case GL_FRAGMENT_SHADER_ATI:
1576          if (ctx->API != API_OPENGL_COMPAT)
1577             goto invalid_enum_error;
1578          CHECK_EXTENSION(ATI_fragment_shader);
1579          return ctx->ATIFragmentShader.Enabled;
1580
1581       case GL_TEXTURE_CUBE_MAP_SEAMLESS:
1582          if (!_mesa_is_desktop_gl(ctx))
1583             goto invalid_enum_error;
1584          CHECK_EXTENSION(ARB_seamless_cube_map);
1585          return ctx->Texture.CubeMapSeamless;
1586
1587       case GL_RASTERIZER_DISCARD:
1588          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
1589             goto invalid_enum_error;
1590          CHECK_EXTENSION(EXT_transform_feedback);
1591          return ctx->RasterDiscard;
1592
1593       /* GL_NV_primitive_restart */
1594       case GL_PRIMITIVE_RESTART_NV:
1595          if (ctx->API != API_OPENGL_COMPAT || !ctx->Extensions.NV_primitive_restart) {
1596             goto invalid_enum_error;
1597          }
1598          return ctx->Array.PrimitiveRestart;
1599
1600       /* GL 3.1 primitive restart */
1601       case GL_PRIMITIVE_RESTART:
1602          if (!_mesa_is_desktop_gl(ctx) || ctx->Version < 31) {
1603             goto invalid_enum_error;
1604          }
1605          return ctx->Array.PrimitiveRestart;
1606
1607       case GL_PRIMITIVE_RESTART_FIXED_INDEX:
1608          if (!_mesa_is_gles3(ctx) && !ctx->Extensions.ARB_ES3_compatibility) {
1609             goto invalid_enum_error;
1610          }
1611          return ctx->Array.PrimitiveRestartFixedIndex;
1612
1613       /* GL3.0 - GL_framebuffer_sRGB */
1614       case GL_FRAMEBUFFER_SRGB_EXT:
1615          if (!_mesa_is_desktop_gl(ctx))
1616             goto invalid_enum_error;
1617          CHECK_EXTENSION(EXT_framebuffer_sRGB);
1618          return ctx->Color.sRGBEnabled;
1619
1620       /* GL_OES_EGL_image_external */
1621       case GL_TEXTURE_EXTERNAL_OES:
1622          if (!_mesa_is_gles(ctx))
1623             goto invalid_enum_error;
1624          CHECK_EXTENSION(OES_EGL_image_external);
1625          return is_texture_enabled(ctx, TEXTURE_EXTERNAL_BIT);
1626
1627       /* ARB_texture_multisample */
1628       case GL_SAMPLE_MASK:
1629          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles31(ctx))
1630             goto invalid_enum_error;
1631          CHECK_EXTENSION(ARB_texture_multisample);
1632          return ctx->Multisample.SampleMask;
1633
1634       /* ARB_sample_shading */
1635       case GL_SAMPLE_SHADING:
1636          if (!_mesa_is_desktop_gl(ctx) && !_mesa_is_gles3(ctx))
1637             goto invalid_enum_error;
1638          CHECK_EXTENSION(ARB_sample_shading);
1639          return ctx->Multisample.SampleShading;
1640
1641       case GL_BLEND_ADVANCED_COHERENT_KHR:
1642          CHECK_EXTENSION(KHR_blend_equation_advanced_coherent);
1643          return ctx->Color.BlendCoherent;
1644
1645       case GL_CONSERVATIVE_RASTERIZATION_INTEL:
1646          CHECK_EXTENSION(INTEL_conservative_rasterization);
1647          return ctx->IntelConservativeRasterization;
1648
1649       default:
1650          goto invalid_enum_error;
1651    }
1652
1653    return GL_FALSE;
1654
1655 invalid_enum_error:
1656    _mesa_error(ctx, GL_INVALID_ENUM, "glIsEnabled(%s)",
1657                _mesa_enum_to_string(cap));
1658    return GL_FALSE;
1659 }