upstream-doc/man2/glIsEnabled.xml

   1 <?xml version="1.0" encoding="UTF-8"?>
   2 <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
   3               "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
   4 <refentry id="glIsEnabled">
   5     <refmeta>
   6         <refmetainfo>
   7             <copyright>
   8                 <year>1991-2006</year>
   9                 <holder>Silicon Graphics, Inc.</holder>
  10             </copyright>
  11         </refmetainfo>
  12         <refentrytitle>glIsEnabled</refentrytitle>
  13         <manvolnum>3G</manvolnum>
  14     </refmeta>
  15     <refnamediv>
  16         <refname>glIsEnabled</refname>
  17         <refpurpose>test whether a capability is enabled</refpurpose>
  18     </refnamediv>
  19     <refsynopsisdiv><title>C Specification</title>
  20         <funcsynopsis>
  21             <funcprototype>
  22                 <funcdef>GLboolean <function>glIsEnabled</function></funcdef>
  23                 <paramdef>GLenum <parameter>cap</parameter></paramdef>
  24             </funcprototype>
  25         </funcsynopsis>
  26     </refsynopsisdiv>
  27     <refsect1 id="parameters"><title>Parameters</title>
  28         <variablelist>
  29         <varlistentry>
  30             <term><parameter>cap</parameter></term>
  31             <listitem>
  32                 <para>
  33                     Specifies a symbolic constant indicating a GL capability.
  34                 </para>
  35             </listitem>
  36         </varlistentry>
  37         </variablelist>
  38     </refsect1>
  39     <refsect1 id="description"><title>Description</title>
  40         <para>
  41             <function>glIsEnabled</function> returns <constant>GL_TRUE</constant> if <parameter>cap</parameter> is an enabled capability
  42             and returns <constant>GL_FALSE</constant> otherwise.
  43             Initially all capabilities except <constant>GL_DITHER</constant> are disabled;
  44             <constant>GL_DITHER</constant> is initially enabled.
  45         </para>
  46         <para>
  47             The following capabilities are accepted for <parameter>cap</parameter>:
  48         </para>
  49         <para>
  50         </para>
  51         <informaltable frame="topbot">
  52             <tgroup cols="2" align="left">
  53                 <colspec/>
  54                 <colspec/>
  55                 <thead>
  56                     <row>
  57                         <entry rowsep="1" align="left"><emphasis role="bold">
  58                         Constant
  59                         </emphasis></entry>
  60                         <entry rowsep="1" align="left"><emphasis role="bold">
  61                         See
  62                         </emphasis></entry>
  63                     </row>
  64                 </thead>
  65                 <tbody>
  66                     <row>
  67                         <entry align="left">
  68                         <constant>GL_ALPHA_TEST</constant>
  69                         </entry>
  70                         <entry align="left">
  71                         <citerefentry><refentrytitle>glAlphaFunc</refentrytitle></citerefentry>
  72                         </entry>
  73                     </row>
  74                     <row>
  75                         <entry align="left">
  76                         <constant>GL_AUTO_NORMAL</constant>
  77                         </entry>
  78                         <entry align="left">
  79                         <citerefentry><refentrytitle>glEvalCoord</refentrytitle></citerefentry>
  80                         </entry>
  81                     </row>
  82                     <row>
  83                         <entry align="left">
  84                         <constant>GL_BLEND</constant>
  85                         </entry>
  86                         <entry align="left">
  87                         <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glLogicOp</refentrytitle></citerefentry>
  88                         </entry>
  89                     </row>
  90                     <row>
  91                         <entry align="left">
  92                         <constant>GL_CLIP_PLANE</constant><emphasis>i</emphasis>
  93                         </entry>
  94                         <entry align="left">
  95                         <citerefentry><refentrytitle>glClipPlane</refentrytitle></citerefentry>
  96                         </entry>
  97                     </row>
  98                     <row>
  99                         <entry align="left">
 100                         <constant>GL_COLOR_ARRAY</constant>
 101                         </entry>
 102                         <entry align="left">
 103                         <citerefentry><refentrytitle>glColorPointer</refentrytitle></citerefentry>
 104                         </entry>
 105                     </row>
 106                     <row>
 107                         <entry align="left">
 108                         <constant>GL_COLOR_LOGIC_OP</constant>
 109                         </entry>
 110                         <entry align="left">
 111                         <citerefentry><refentrytitle>glLogicOp</refentrytitle></citerefentry>
 112                         </entry>
 113                     </row>
 114                     <row>
 115                         <entry align="left">
 116                         <constant>GL_COLOR_MATERIAL</constant>
 117                         </entry>
 118                         <entry align="left">
 119                         <citerefentry><refentrytitle>glColorMaterial</refentrytitle></citerefentry>
 120                         </entry>
 121                     </row>
 122                     <row>
 123                         <entry align="left">
 124                         <constant>GL_COLOR_SUM</constant>
 125                         </entry>
 126                         <entry align="left">
 127                         <citerefentry><refentrytitle>glSecondaryColor</refentrytitle></citerefentry>
 128                         </entry>
 129                     </row>
 130                     <row>
 131                         <entry align="left">
 132                         <constant>GL_COLOR_TABLE</constant>
 133                         </entry>
 134                         <entry align="left">
 135                         <citerefentry><refentrytitle>glColorTable</refentrytitle></citerefentry>
 136                         </entry>
 137                     </row>
 138                     <row>
 139                         <entry align="left">
 140                         <constant>GL_CONVOLUTION_1D</constant>
 141                         </entry>
 142                         <entry align="left">
 143                         <citerefentry><refentrytitle>glConvolutionFilter1D</refentrytitle></citerefentry>
 144                         </entry>
 145                     </row>
 146                     <row>
 147                         <entry align="left">
 148                         <constant>GL_CONVOLUTION_2D</constant>
 149                         </entry>
 150                         <entry align="left">
 151                         <citerefentry><refentrytitle>glConvolutionFilter2D</refentrytitle></citerefentry>
 152                         </entry>
 153                     </row>
 154                     <row>
 155                         <entry align="left">
 156                         <constant>GL_CULL_FACE</constant>
 157                         </entry>
 158                         <entry align="left">
 159                         <citerefentry><refentrytitle>glCullFace</refentrytitle></citerefentry>
 160                         </entry>
 161                     </row>
 162                     <row>
 163                         <entry align="left">
 164                         <constant>GL_DEPTH_TEST</constant>
 165                         </entry>
 166                         <entry align="left">
 167                         <citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>
 168                         </entry>
 169                     </row>
 170                     <row>
 171                         <entry align="left">
 172                         <constant>GL_DITHER</constant>
 173                         </entry>
 174                         <entry align="left">
 175                         <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>
 176                         </entry>
 177                     </row>
 178                     <row>
 179                         <entry align="left">
 180                         <constant>GL_EDGE_FLAG_ARRAY</constant>
 181                         </entry>
 182                         <entry align="left">
 183                         <citerefentry><refentrytitle>glEdgeFlagPointer</refentrytitle></citerefentry>
 184                         </entry>
 185                     </row>
 186                     <row>
 187                         <entry align="left">
 188                         <constant>GL_FOG</constant>
 189                         </entry>
 190                         <entry align="left">
 191                         <citerefentry><refentrytitle>glFog</refentrytitle></citerefentry>
 192                         </entry>
 193                     </row>
 194                     <row>
 195                         <entry align="left">
 196                         <constant>GL_FOG_COORD_ARRAY</constant>
 197                         </entry>
 198                         <entry align="left">
 199                         <citerefentry><refentrytitle>glFogCoordPointer</refentrytitle></citerefentry>
 200                         </entry>
 201                     </row>
 202                     <row>
 203                         <entry align="left">
 204                         <constant>GL_HISTOGRAM</constant>
 205                         </entry>
 206                         <entry align="left">
 207                         <citerefentry><refentrytitle>glHistogram</refentrytitle></citerefentry>
 208                         </entry>
 209                     </row>
 210                     <row>
 211                         <entry align="left">
 212                         <constant>GL_INDEX_ARRAY</constant>
 213                         </entry>
 214                         <entry align="left">
 215                         <citerefentry><refentrytitle>glIndexPointer</refentrytitle></citerefentry>
 216                         </entry>
 217                     </row>
 218                     <row>
 219                         <entry align="left">
 220                         <constant>GL_INDEX_LOGIC_OP</constant>
 221                         </entry>
 222                         <entry align="left">
 223                         <citerefentry><refentrytitle>glLogicOp</refentrytitle></citerefentry>
 224                         </entry>
 225                     </row>
 226                     <row>
 227                         <entry align="left">
 228                         <constant>GL_LIGHT</constant><emphasis>i</emphasis>
 229                         </entry>
 230                         <entry align="left">
 231                         <citerefentry><refentrytitle>glLightModel</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glLight</refentrytitle></citerefentry>
 232                         </entry>
 233                     </row>
 234                     <row>
 235                         <entry align="left">
 236                         <constant>GL_LIGHTING</constant>
 237                         </entry>
 238                         <entry align="left">
 239                         <citerefentry><refentrytitle>glMaterial</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glLightModel</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glLight</refentrytitle></citerefentry>
 240                         </entry>
 241                     </row>
 242                     <row>
 243                         <entry align="left">
 244                         <constant>GL_LINE_SMOOTH</constant>
 245                         </entry>
 246                         <entry align="left">
 247                         <citerefentry><refentrytitle>glLineWidth</refentrytitle></citerefentry>
 248                         </entry>
 249                     </row>
 250                     <row>
 251                         <entry align="left">
 252                         <constant>GL_LINE_STIPPLE</constant>
 253                         </entry>
 254                         <entry align="left">
 255                         <citerefentry><refentrytitle>glLineStipple</refentrytitle></citerefentry>
 256                         </entry>
 257                     </row>
 258                     <row>
 259                         <entry align="left">
 260                         <constant>GL_MAP1_COLOR_4</constant>
 261                         </entry>
 262                         <entry align="left">
 263                         <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry>
 264                         </entry>
 265                     </row>
 266                     <row>
 267                         <entry align="left">
 268                         <constant>GL_MAP1_INDEX</constant>
 269                         </entry>
 270                         <entry align="left">
 271                         <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry>
 272                         </entry>
 273                     </row>
 274                     <row>
 275                         <entry align="left">
 276                         <constant>GL_MAP1_NORMAL</constant>
 277                         </entry>
 278                         <entry align="left">
 279                         <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry>
 280                         </entry>
 281                     </row>
 282                     <row>
 283                         <entry align="left">
 284                         <constant>GL_MAP1_TEXTURE_COORD_1</constant>
 285                         </entry>
 286                         <entry align="left">
 287                         <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry>
 288                         </entry>
 289                     </row>
 290                     <row>
 291                         <entry align="left">
 292                         <constant>GL_MAP1_TEXTURE_COORD_2</constant>
 293                         </entry>
 294                         <entry align="left">
 295                         <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry>
 296                         </entry>
 297                     </row>
 298                     <row>
 299                         <entry align="left">
 300                         <constant>GL_MAP1_TEXTURE_COORD_3</constant>
 301                         </entry>
 302                         <entry align="left">
 303                         <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry>
 304                         </entry>
 305                     </row>
 306                     <row>
 307                         <entry align="left">
 308                         <constant>GL_MAP1_TEXTURE_COORD_4</constant>
 309                         </entry>
 310                         <entry align="left">
 311                         <citerefentry><refentrytitle>glMap1</refentrytitle></citerefentry>
 312                         </entry>
 313                     </row>
 314                     <row>
 315                         <entry align="left">
 316                         <constant>GL_MAP2_COLOR_4</constant>
 317                         </entry>
 318                         <entry align="left">
 319                         <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>
 320                         </entry>
 321                     </row>
 322                     <row>
 323                         <entry align="left">
 324                         <constant>GL_MAP2_INDEX</constant>
 325                         </entry>
 326                         <entry align="left">
 327                         <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>
 328                         </entry>
 329                     </row>
 330                     <row>
 331                         <entry align="left">
 332                         <constant>GL_MAP2_NORMAL</constant>
 333                         </entry>
 334                         <entry align="left">
 335                         <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>
 336                         </entry>
 337                     </row>
 338                     <row>
 339                         <entry align="left">
 340                         <constant>GL_MAP2_TEXTURE_COORD_1</constant>
 341                         </entry>
 342                         <entry align="left">
 343                         <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>
 344                         </entry>
 345                     </row>
 346                     <row>
 347                         <entry align="left">
 348                         <constant>GL_MAP2_TEXTURE_COORD_2</constant>
 349                         </entry>
 350                         <entry align="left">
 351                         <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>
 352                         </entry>
 353                     </row>
 354                     <row>
 355                         <entry align="left">
 356                         <constant>GL_MAP2_TEXTURE_COORD_3</constant>
 357                         </entry>
 358                         <entry align="left">
 359                         <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>
 360                         </entry>
 361                     </row>
 362                     <row>
 363                         <entry align="left">
 364                         <constant>GL_MAP2_TEXTURE_COORD_4</constant>
 365                         </entry>
 366                         <entry align="left">
 367                         <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>
 368                         </entry>
 369                     </row>
 370                     <row>
 371                         <entry align="left">
 372                         <constant>GL_MAP2_VERTEX_3</constant>
 373                         </entry>
 374                         <entry align="left">
 375                         <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>
 376                         </entry>
 377                     </row>
 378                     <row>
 379                         <entry align="left">
 380                         <constant>GL_MAP2_VERTEX_4</constant>
 381                         </entry>
 382                         <entry align="left">
 383                         <citerefentry><refentrytitle>glMap2</refentrytitle></citerefentry>
 384                         </entry>
 385                     </row>
 386                     <row>
 387                         <entry align="left">
 388                         <constant>GL_MINMAX</constant>
 389                         </entry>
 390                         <entry align="left">
 391                         <citerefentry><refentrytitle>glMinmax</refentrytitle></citerefentry>
 392                         </entry>
 393                     </row>
 394                     <row>
 395                         <entry align="left">
 396                         <constant>GL_MULTISAMPLE</constant>
 397                         </entry>
 398                         <entry align="left">
 399                         <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>
 400                         </entry>
 401                     </row>
 402                     <row>
 403                         <entry align="left">
 404                         <constant>GL_NORMAL_ARRAY</constant>
 405                         </entry>
 406                         <entry align="left">
 407                         <citerefentry><refentrytitle>glNormalPointer</refentrytitle></citerefentry>
 408                         </entry>
 409                     </row>
 410                     <row>
 411                         <entry align="left">
 412                         <constant>GL_NORMALIZE</constant>
 413                         </entry>
 414                         <entry align="left">
 415                         <citerefentry><refentrytitle>glNormal</refentrytitle></citerefentry>
 416                         </entry>
 417                     </row>
 418                     <row>
 419                         <entry align="left">
 420                         <constant>GL_POINT_SMOOTH</constant>
 421                         </entry>
 422                         <entry align="left">
 423                         <citerefentry><refentrytitle>glPointSize</refentrytitle></citerefentry>
 424                         </entry>
 425                     </row>
 426                     <row>
 427                         <entry align="left">
 428                         <constant>GL_POINT_SPRITE</constant>
 429                         </entry>
 430                         <entry align="left">
 431                         <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>
 432                         </entry>
 433                     </row>
 434                     <row>
 435                         <entry align="left">
 436                         <constant>GL_POLYGON_SMOOTH</constant>
 437                         </entry>
 438                         <entry align="left">
 439                         <citerefentry><refentrytitle>glPolygonMode</refentrytitle></citerefentry>
 440                         </entry>
 441                     </row>
 442                     <row>
 443                         <entry align="left">
 444                         <constant>GL_POLYGON_OFFSET_FILL</constant>
 445                         </entry>
 446                         <entry align="left">
 447                         <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>
 448                         </entry>
 449                     </row>
 450                     <row>
 451                         <entry align="left">
 452                         <constant>GL_POLYGON_OFFSET_LINE</constant>
 453                         </entry>
 454                         <entry align="left">
 455                         <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>
 456                         </entry>
 457                     </row>
 458                     <row>
 459                         <entry align="left">
 460                         <constant>GL_POLYGON_OFFSET_POINT</constant>
 461                         </entry>
 462                         <entry align="left">
 463                         <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>
 464                         </entry>
 465                     </row>
 466                     <row>
 467                         <entry align="left">
 468                         <constant>GL_POLYGON_STIPPLE</constant>
 469                         </entry>
 470                         <entry align="left">
 471                         <citerefentry><refentrytitle>glPolygonStipple</refentrytitle></citerefentry>
 472                         </entry>
 473                     </row>
 474                     <row>
 475                         <entry align="left">
 476                         <constant>GL_POST_COLOR_MATRIX_COLOR_TABLE</constant>
 477                         </entry>
 478                         <entry align="left">
 479                         <citerefentry><refentrytitle>glColorTable</refentrytitle></citerefentry>
 480                         </entry>
 481                     </row>
 482                     <row>
 483                         <entry align="left">
 484                         <constant>GL_POST_CONVOLUTION_COLOR_TABLE</constant>
 485                         </entry>
 486                         <entry align="left">
 487                         <citerefentry><refentrytitle>glColorTable</refentrytitle></citerefentry>
 488                         </entry>
 489                     </row>
 490                     <row>
 491                         <entry align="left">
 492                         <constant>GL_RESCALE_NORMAL</constant>
 493                         </entry>
 494                         <entry align="left">
 495                         <citerefentry><refentrytitle>glNormal</refentrytitle></citerefentry>
 496                         </entry>
 497                     </row>
 498                     <row>
 499                         <entry align="left">
 500                         <constant>GL_SAMPLE_ALPHA_TO_COVERAGE</constant>
 501                         </entry>
 502                         <entry align="left">
 503                         <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>
 504                         </entry>
 505                     </row>
 506                     <row>
 507                         <entry align="left">
 508                         <constant>GL_SAMPLE_ALPHA_TO_ONE</constant>
 509                         </entry>
 510                         <entry align="left">
 511                         <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>
 512                         </entry>
 513                     </row>
 514                     <row>
 515                         <entry align="left">
 516                         <constant>GL_SAMPLE_COVERAGE</constant>
 517                         </entry>
 518                         <entry align="left">
 519                         <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>
 520                         </entry>
 521                     </row>
 522                     <row>
 523                         <entry align="left">
 524                         <constant>GL_SCISSOR_TEST</constant>
 525                         </entry>
 526                         <entry align="left">
 527                         <citerefentry><refentrytitle>glScissor</refentrytitle></citerefentry>
 528                         </entry>
 529                     </row>
 530                     <row>
 531                         <entry align="left">
 532                         <constant>GL_SECONDARY_COLOR_ARRAY</constant>
 533                         </entry>
 534                         <entry align="left">
 535                         <citerefentry><refentrytitle>glSecondaryColorPointer</refentrytitle></citerefentry>
 536                         </entry>
 537                     </row>
 538                     <row>
 539                         <entry align="left">
 540                         <constant>GL_SEPARABLE_2D</constant>
 541                         </entry>
 542                         <entry align="left">
 543                         <citerefentry><refentrytitle>glSeparableFilter2D</refentrytitle></citerefentry>
 544                         </entry>
 545                     </row>
 546                     <row>
 547                         <entry align="left">
 548                         <constant>GL_STENCIL_TEST</constant>
 549                         </entry>
 550                         <entry align="left">
 551                         <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>, <citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>
 552                         </entry>
 553                     </row>
 554                     <row>
 555                         <entry align="left">
 556                         <constant>GL_TEXTURE_1D</constant>
 557                         </entry>
 558                         <entry align="left">
 559                         <citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>
 560                         </entry>
 561                     </row>
 562                     <row>
 563                         <entry align="left">
 564                         <constant>GL_TEXTURE_2D</constant>
 565                         </entry>
 566                         <entry align="left">
 567                         <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>
 568                         </entry>
 569                     </row>
 570                     <row>
 571                         <entry align="left">
 572                         <constant>GL_TEXTURE_3D</constant>
 573                         </entry>
 574                         <entry align="left">
 575                         <citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>
 576                         </entry>
 577                     </row>
 578                     <row>
 579                         <entry align="left">
 580                         <constant>GL_TEXTURE_COORD_ARRAY</constant>
 581                         </entry>
 582                         <entry align="left">
 583                         <citerefentry><refentrytitle>glTexCoordPointer</refentrytitle></citerefentry>
 584                         </entry>
 585                     </row>
 586                     <row>
 587                         <entry align="left">
 588                         <constant>GL_TEXTURE_CUBE_MAP</constant>
 589                         </entry>
 590                         <entry align="left">
 591                         <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>
 592                         </entry>
 593                     </row>
 594                     <row>
 595                         <entry align="left">
 596                         <constant>GL_TEXTURE_GEN_Q</constant>
 597                         </entry>
 598                         <entry align="left">
 599                         <citerefentry><refentrytitle>glTexGen</refentrytitle></citerefentry>
 600                         </entry>
 601                     </row>
 602                     <row>
 603                         <entry align="left">
 604                         <constant>GL_TEXTURE_GEN_R</constant>
 605                         </entry>
 606                         <entry align="left">
 607                         <citerefentry><refentrytitle>glTexGen</refentrytitle></citerefentry>
 608                         </entry>
 609                     </row>
 610                     <row>
 611                         <entry align="left">
 612                         <constant>GL_TEXTURE_GEN_S</constant>
 613                         </entry>
 614                         <entry align="left">
 615                         <citerefentry><refentrytitle>glTexGen</refentrytitle></citerefentry>
 616                         </entry>
 617                     </row>
 618                     <row>
 619                         <entry align="left">
 620                         <constant>GL_TEXTURE_GEN_T</constant>
 621                         </entry>
 622                         <entry align="left">
 623                         <citerefentry><refentrytitle>glTexGen</refentrytitle></citerefentry>
 624                         </entry>
 625                     </row>
 626                     <row>
 627                         <entry align="left">
 628                         <constant>GL_VERTEX_ARRAY</constant>
 629                         </entry>
 630                         <entry align="left">
 631                         <citerefentry><refentrytitle>glVertexPointer</refentrytitle></citerefentry>
 632                         </entry>
 633                     </row>
 634                     <row>
 635                         <entry align="left">
 636                         <constant>GL_VERTEX_PROGRAM_POINT_SIZE</constant>
 637                         </entry>
 638                         <entry align="left">
 639                         <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>
 640                         </entry>
 641                     </row>
 642                     <row>
 643                         <entry align="left">
 644                         <constant>GL_VERTEX_PROGRAM_TWO_SIDE</constant>
 645                         </entry>
 646                         <entry align="left">
 647                         <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>
 648                         </entry>
 649                     </row>
 650                 </tbody>
 651             </tgroup>
 652         </informaltable>
 653         <para>
 654         </para>
 655     </refsect1>
 656     <refsect1 id="notes"><title>Notes</title>
 657         <para>
 658             If an error is generated,
 659             <function>glIsEnabled</function> returns 0.
 660         </para>
 661         <para>
 662             <constant>GL_COLOR_LOGIC_OP</constant>,
 663             <constant>GL_COLOR_ARRAY</constant>,
 664             <constant>GL_EDGE_FLAG_ARRAY</constant>,
 665             <constant>GL_INDEX_ARRAY</constant>,
 666             <constant>GL_INDEX_LOGIC_OP</constant>,
 667             <constant>GL_NORMAL_ARRAY</constant>,
 668             <constant>GL_POLYGON_OFFSET_FILL</constant>,
 669             <constant>GL_POLYGON_OFFSET_LINE</constant>,
 670             <constant>GL_POLYGON_OFFSET_POINT</constant>,
 671             <constant>GL_TEXTURE_COORD_ARRAY</constant>, and
 672             <constant>GL_VERTEX_ARRAY</constant>
 673             are available only
 674             if the GL version is 1.1 or greater.
 675         </para>
 676         <para>
 677             <constant>GL_RESCALE_NORMAL</constant>, and <constant>GL_TEXTURE_3D</constant> are available only if the GL
 678             version is 1.2 or greater.
 679         </para>
 680         <para>
 681             <constant>GL_MULTISAMPLE</constant>,
 682             <constant>GL_SAMPLE_ALPHA_TO_COVERAGE</constant>,
 683             <constant>GL_SAMPLE_ALPHA_TO_ONE</constant>,
 684             <constant>GL_SAMPLE_COVERAGE</constant>,
 685             <constant>GL_TEXTURE_CUBE_MAP</constant>
 686             are available only if the GL version is 1.3 or greater.
 687         </para>
 688         <para>
 689             <constant>GL_FOG_COORD_ARRAY</constant> and <constant>GL_SECONDARY_COLOR_ARRAY</constant>
 690             are available only if the GL version is 1.4 or greater.
 691         </para>
 692         <para>
 693             <constant>GL_POINT_SPRITE</constant>,
 694             <constant>GL_VERTEX_PROGRAM_POINT_SIZE</constant>, and
 695             <constant>GL_VERTEX_PROGRAM_TWO_SIDE</constant>
 696             are available only if the GL version is 2.0 or greater.
 697         </para>
 698         <para>
 699             <constant>GL_COLOR_TABLE</constant>, <constant>GL_CONVOLUTION_1D</constant>, <constant>GL_CONVOLUTION_2D</constant>,
 700             <constant>GL_HISTOGRAM</constant>, <constant>GL_MINMAX</constant>,
 701             <constant>GL_POST_COLOR_MATRIX_COLOR_TABLE</constant>,
 702             <constant>GL_POST_CONVOLUTION_COLOR_TABLE</constant>, and
 703             <constant>GL_SEPARABLE_2D</constant> are available only if <code>ARB_imaging</code> is
 704             returned when <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> is called with <constant>GL_EXTENSIONS</constant>.
 705         </para>
 706         <para>
 707             For OpenGL versions 1.3 and greater, or when the <code>ARB_multitexture</code> extension is supported, the following
 708             parameters return the associated value for the active texture unit:
 709             <constant>GL_TEXTURE_1D</constant>,
 710             <constant>GL_TEXTURE_2D</constant>,
 711             <constant>GL_TEXTURE_3D</constant>,
 712             <constant>GL_TEXTURE_CUBE_MAP</constant>,
 713             <constant>GL_TEXTURE_GEN_S</constant>,
 714             <constant>GL_TEXTURE_GEN_T</constant>,
 715             <constant>GL_TEXTURE_GEN_R</constant>,
 716             <constant>GL_TEXTURE_GEN_Q</constant>,
 717             <constant>GL_TEXTURE_MATRIX</constant>, and
 718             <constant>GL_TEXTURE_STACK_DEPTH</constant>.
 719             Likewise, the following parameters return the associated value for the
 720             active client texture unit:
 721             <constant>GL_TEXTURE_COORD_ARRAY</constant>,
 722             <constant>GL_TEXTURE_COORD_ARRAY_SIZE</constant>,
 723             <constant>GL_TEXTURE_COORD_ARRAY_STRIDE</constant>,
 724             <constant>GL_TEXTURE_COORD_ARRAY_TYPE</constant>.
 725         </para>
 726     </refsect1>
 727     <refsect1 id="errors"><title>Errors</title>
 728         <para>
 729             <constant>GL_INVALID_ENUM</constant> is generated if <parameter>cap</parameter> is not an accepted value.
 730         </para>
 731         <para>
 732             <constant>GL_INVALID_OPERATION</constant> is generated if <function>glIsEnabled</function>
 733             is executed between the execution of <citerefentry><refentrytitle>glBegin</refentrytitle></citerefentry>
 734             and the corresponding execution of <citerefentry><refentrytitle>glEnd</refentrytitle></citerefentry>.
 735         </para>
 736     </refsect1>
 737     <refsect1 id="seealso"><title>See Also</title>
 738         <para>
 739             <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>,
 740             <citerefentry><refentrytitle>glEnableClientState</refentrytitle></citerefentry>,
 741             <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
 742         </para>
 743     </refsect1>
 744     <refsect1 id="Copyright"><title>Copyright</title>
 745         <para>
 746             Copyright <trademark class="copyright"></trademark> 1991-2006
 747             Silicon Graphics, Inc. This document is licensed under the SGI
 748             Free Software B License. For details, see
 749             <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
 750         </para>
 751     </refsect1>
 752 </refentry>