upstream-man-pages/man4/glEnable.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="glEnable">
   5     <refmeta>
   6         <refmetainfo>
   7             <copyright>
   8                 <year>1991-2006</year>
   9                 <holder>Silicon Graphics, Inc.</holder>
  10             </copyright>
  11         </refmetainfo>
  12         <refentrytitle>glEnable</refentrytitle>
  13         <manvolnum>3G</manvolnum>
  14     </refmeta>
  15     <refnamediv>
  16         <refname>glEnable</refname>
  17         <refpurpose>enable or disable server-side GL capabilities</refpurpose>
  18     </refnamediv>
  19     <refsynopsisdiv><title>C Specification</title>
  20         <funcsynopsis>
  21             <funcprototype>
  22                 <funcdef>void <function>glEnable</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     <refsynopsisdiv><title>C Specification</title>
  40         <funcsynopsis>
  41             <funcprototype>
  42                 <funcdef>void <function>glDisable</function></funcdef>
  43                 <paramdef>GLenum <parameter>cap</parameter></paramdef>
  44             </funcprototype>
  45         </funcsynopsis>
  46     </refsynopsisdiv>
  47     <refsect1 id="parameters2"><title>Parameters</title>
  48         <variablelist>
  49         <varlistentry>
  50             <term><parameter>cap</parameter></term>
  51             <listitem>
  52                 <para>
  53                     Specifies a symbolic constant indicating a GL capability.
  54                 </para>
  55             </listitem>
  56         </varlistentry>
  57         </variablelist>
  58     </refsect1>
  59     <refsynopsisdiv><title>C Specification</title>
  60         <funcsynopsis>
  61             <funcprototype>
  62                 <funcdef>void <function>glEnablei</function></funcdef>
  63                 <paramdef>GLenum <parameter>cap</parameter></paramdef>
  64                 <paramdef>GLuint <parameter>index</parameter></paramdef>
  65             </funcprototype>
  66         </funcsynopsis>
  67     </refsynopsisdiv>
  68     <refsect1 id="parameters3"><title>Parameters</title>
  69         <variablelist>
  70         <varlistentry>
  71             <term><parameter>cap</parameter></term>
  72             <listitem>
  73                 <para>
  74                     Specifies a symbolic constant indicating a GL capability.
  75                 </para>
  76             </listitem>
  77         </varlistentry>
  78         <varlistentry>
  79             <term><parameter>index</parameter></term>
  80             <listitem>
  81                 <para>
  82                     Specifies the index of the swtich to enable.
  83                 </para>
  84             </listitem>
  85         </varlistentry>
  86         </variablelist>
  87     </refsect1>
  88     <refsynopsisdiv><title>C Specification</title>
  89         <funcsynopsis>
  90             <funcprototype>
  91                 <funcdef>void <function>glDisablei</function></funcdef>
  92                 <paramdef>GLenum <parameter>cap</parameter></paramdef>
  93                 <paramdef>GLuint <parameter>index</parameter></paramdef>
  94             </funcprototype>
  95         </funcsynopsis>
  96     </refsynopsisdiv>
  97     <refsect1 id="parameters4"><title>Parameters</title>
  98         <variablelist>
  99         <varlistentry>
 100             <term><parameter>cap</parameter></term>
 101             <listitem>
 102                 <para>
 103                     Specifies a symbolic constant indicating a GL capability.
 104                 </para>
 105             </listitem>
 106         </varlistentry>
 107         <varlistentry>
 108             <term><parameter>index</parameter></term>
 109             <listitem>
 110                 <para>
 111                     Specifies the index of the swtich to disable.
 112                 </para>
 113             </listitem>
 114         </varlistentry>
 115         </variablelist>
 116     </refsect1>
 117     <refsect1 id="description"><title>Description</title>
 118         <para>
 119             <function>glEnable</function> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry> enable and disable various capabilities.
 120             Use <citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> or <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> to determine the current setting
 121             of any capability. The initial value for each capability with the
 122             exception of <constant>GL_DITHER</constant> and <constant>GL_MULTISAMPLE</constant> is
 123             <constant>GL_FALSE</constant>. The initial value for
 124             <constant>GL_DITHER</constant> and <constant>GL_MULTISAMPLE</constant> is <constant>GL_TRUE</constant>.
 125         </para>
 126         <para>
 127             Both <function>glEnable</function> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry> take a single argument, <parameter>cap</parameter>,
 128             which can assume one of the following values:
 129         </para>
 130         <para>
 131             Some of the GL's capabilities are indexed. <function>glEnablei</function> and <function>glDisablei</function> enable and disable
 132             indexed capabilities.
 133         </para>
 134         <variablelist>
 135             <varlistentry>
 136                 <term><constant>GL_BLEND</constant></term>
 137                 <listitem>
 138                  <para>
 139                 </para>
 140                     <para>
 141                         If enabled,
 142                         blend the computed fragment color values with the values in the color
 143                         buffers. See <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>.
 144                     </para>
 145                 </listitem>
 146             </varlistentry>
 147             <varlistentry>
 148                 <term><constant>GL_CLIP_DISTANCE</constant><emphasis>i</emphasis></term>
 149                 <listitem>
 150                 <para>
 151                 </para>
 152                     <para>
 153                         If enabled, clip geometry against user-defined half space <emphasis>i</emphasis>.
 154                     </para>
 155                 </listitem>
 156             </varlistentry>
 157             <varlistentry>
 158                 <term><constant>GL_COLOR_LOGIC_OP</constant></term>
 159                 <listitem>
 160                 <para>
 161                 </para>
 162                     <para>
 163                         If enabled,
 164                         apply the currently selected logical operation to the computed fragment
 165                         color and color buffer values. See <citerefentry><refentrytitle>glLogicOp</refentrytitle></citerefentry>.
 166                     </para>
 167                 </listitem>
 168             </varlistentry>
 169             <varlistentry>
 170                 <term><constant>GL_CULL_FACE</constant></term>
 171                 <listitem>
 172                 <para>
 173                 </para>
 174                     <para>
 175                         If enabled,
 176                         cull polygons based on their winding in window coordinates.
 177                         See <citerefentry><refentrytitle>glCullFace</refentrytitle></citerefentry>.
 178                     </para>
 179                 </listitem>
 180             </varlistentry>
 181             <varlistentry>
 182                 <term><constant>GL_DEBUG_OUTPUT</constant></term>
 183                 <listitem>
 184                 <para>
 185                 </para>
 186                     <para>
 187                         If enabled, debug messages are produced by a debug context. When disabled,
 188                         the debug message log is silenced. Note that in a non-debug context, very
 189                         few, if any messages might be produced, even when <constant>GL_DEBUG_OUTPUT</constant>
 190                         is enabled.
 191                     </para>
 192                 </listitem>
 193             </varlistentry>
 194             <varlistentry>
 195                 <term><constant>GL_DEBUG_OUTPUT_SYNCHRONOUS</constant></term>
 196                 <listitem>
 197                 <para>
 198                 </para>
 199                     <para>
 200                         If enabled, debug messages are produced synchronously by a debug context. If disabled,
 201                         debug messages may be produced asynchronously. In particular, they may be delayed relative
 202                         to the execution of GL commands, and the debug callback function may be called from
 203                         a thread other than that in which the commands are executed.
 204                         See <citerefentry><refentrytitle>glDebugMessageCallback</refentrytitle></citerefentry>.
 205                     </para>
 206                 </listitem>
 207             </varlistentry>
 208             <varlistentry>
 209                 <term><constant>GL_DEPTH_CLAMP</constant></term>
 210                 <listitem>
 211                 <para>
 212                 </para>
 213                     <para>
 214                         If enabled,
 215                         the
 216                         <!-- - wc <= zc <= wc -->
 217                         <inlineequation><mml:math>
 218                             <mml:mo>-</mml:mo><mml:msub><mml:mi>w</mml:mi><mml:mi>c</mml:mi></mml:msub><mml:mo>&le;</mml:mo><mml:msub><mml:mi>z</mml:mi><mml:mi>c</mml:mi></mml:msub><mml:mo>&le;</mml:mo><mml:msub><mml:mi>w</mml:mi><mml:mi>c</mml:mi></mml:msub>
 219                         </mml:math></inlineequation>
 220                         plane equation is ignored by view volume clipping (effectively, there is no near or
 221                         far plane clipping).
 222                         See <citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>.
 223                     </para>
 224                 </listitem>
 225             </varlistentry>
 226             <varlistentry>
 227                 <term><constant>GL_DEPTH_TEST</constant></term>
 228                 <listitem>
 229                 <para>
 230                 </para>
 231                     <para>
 232                         If enabled,
 233                         do depth comparisons and update the depth buffer. Note that even if
 234                         the depth buffer exists and the depth mask is non-zero, the
 235                         depth buffer is not updated if the depth test is disabled. See
 236                         <citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry> and
 237                         <citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>.
 238                     </para>
 239                 </listitem>
 240             </varlistentry>
 241             <varlistentry>
 242                 <term><constant>GL_DITHER</constant>    </term>
 243                 <listitem>
 244                 <para>
 245                 </para>
 246                     <para>
 247                         If enabled,
 248                         dither color components or indices before they are written to the
 249                         color buffer.
 250                     </para>
 251                 </listitem>
 252             </varlistentry>
 253             <varlistentry>
 254                 <term><constant>GL_FRAMEBUFFER_SRGB</constant>    </term>
 255                 <listitem>
 256                 <para>
 257                 </para>
 258                     <para>
 259                         If enabled
 260                         and the value of <constant>GL_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING</constant> for the
 261                         framebuffer attachment corresponding to the destination buffer is <constant>GL_SRGB</constant>,
 262                         the R, G, and B destination color values (after conversion from fixed-point to floating-point)
 263                         are considered to be encoded for the sRGB color space and hence are linearized prior to
 264                         their use in blending.
 265                     </para>
 266                 </listitem>
 267             </varlistentry>
 268             <varlistentry>
 269                 <term><constant>GL_LINE_SMOOTH</constant></term>
 270                 <listitem>
 271                 <para>
 272                 </para>
 273                     <para>
 274                         If enabled,
 275                         draw lines with correct filtering.
 276                         Otherwise,
 277                         draw aliased lines.
 278                         See <citerefentry><refentrytitle>glLineWidth</refentrytitle></citerefentry>.
 279                     </para>
 280                 </listitem>
 281             </varlistentry>
 282             <varlistentry>
 283                 <term><constant>GL_MULTISAMPLE</constant></term>
 284                 <listitem>
 285                 <para>
 286                 </para>
 287                     <para>
 288                         If enabled,
 289                         use multiple fragment samples in computing the final color of a pixel.
 290                         See <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>.
 291                     </para>
 292                 </listitem>
 293             </varlistentry>
 294             <varlistentry>
 295                 <term><constant>GL_POLYGON_OFFSET_FILL</constant></term>
 296                 <listitem>
 297                 <para>
 298                 </para>
 299                     <para>
 300                         If enabled, and if the polygon is rendered in
 301                         <constant>GL_FILL</constant> mode, an offset is added to depth values of a polygon's
 302                         fragments before the depth comparison is performed.
 303                         See <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>.
 304                     </para>
 305                 </listitem>
 306             </varlistentry>
 307             <varlistentry>
 308                 <term><constant>GL_POLYGON_OFFSET_LINE</constant></term>
 309                 <listitem>
 310                 <para>
 311                 </para>
 312                     <para>
 313                         If enabled, and if the polygon is rendered in
 314                         <constant>GL_LINE</constant> mode, an offset is added to depth values of a polygon's
 315                         fragments before the depth comparison is performed.
 316                         See <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>.
 317                     </para>
 318                 </listitem>
 319             </varlistentry>
 320             <varlistentry>
 321                 <term><constant>GL_POLYGON_OFFSET_POINT</constant></term>
 322                 <listitem>
 323                 <para>
 324                 </para>
 325                     <para>
 326                         If enabled, an offset is added to depth values of a polygon's fragments
 327                         before the depth comparison is performed, if the polygon is rendered in
 328                         <constant>GL_POINT</constant> mode. See <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>.
 329                     </para>
 330                 </listitem>
 331             </varlistentry>
 332             <varlistentry>
 333                 <term><constant>GL_POLYGON_SMOOTH</constant></term>
 334                 <listitem>
 335                 <para>
 336                 </para>
 337                     <para>
 338                         If enabled, draw polygons with proper filtering.
 339                         Otherwise, draw aliased polygons. For correct antialiased polygons,
 340                         an alpha buffer is needed and the polygons must be sorted front to
 341                         back.
 342                     </para>
 343                 </listitem>
 344             </varlistentry>
 345             <varlistentry>
 346                 <term><constant>GL_PRIMITIVE_RESTART</constant></term>
 347                 <listitem>
 348                 <para>
 349                 </para>
 350                     <para>
 351                         Enables primitive restarting.  If enabled, any one of the draw commands
 352                         which transfers a set of generic attribute array elements to the GL will restart
 353                         the primitive when the index of the vertex is equal to the primitive restart index.
 354                         See <citerefentry><refentrytitle>glPrimitiveRestartIndex</refentrytitle></citerefentry>.
 355                     </para>
 356                 </listitem>
 357             </varlistentry>
 358             <varlistentry>
 359                 <term><constant>GL_PRIMITIVE_RESTART_FIXED_INDEX</constant></term>
 360                 <listitem>
 361                 <para>
 362                 </para>
 363                     <para>
 364                         Enables primitive restarting with a fixed index. If enabled, any one of the
 365                         draw commands which transfers a set of generic attribute array elements to the GL will
 366                         restart the primitive when the index of the vertex is equal to the fixed primitive
 367                         index for the specified index type. The fixed index is equal to
 368                         <inlineequation><mml:math><mml:msup><mml:mn>2</mml:mn><mml:mi>n</mml:mi></mml:msup><mml:mo>&minus;</mml:mo><mml:mn>1</mml:mn></mml:math></inlineequation>
 369                         where <emphasis>n</emphasis> is equal to 8 for <constant>GL_UNSIGNED_BYTE</constant>,
 370                         16 for <constant>GL_UNSIGNED_SHORT</constant> and 32 for <constant>GL_UNSIGNED_INT</constant>.
 371                     </para>
 372                 </listitem>
 373             </varlistentry>
 374             <varlistentry>
 375                 <term><constant>GL_SAMPLE_ALPHA_TO_COVERAGE</constant></term>
 376                 <listitem>
 377                 <para>
 378                 </para>
 379                     <para>
 380                         If enabled,
 381                         compute a temporary coverage value where each bit is determined by the
 382                         alpha value at the corresponding sample location.  The temporary coverage
 383                         value is then ANDed with the fragment coverage value.
 384                     </para>
 385                 </listitem>
 386             </varlistentry>
 387             <varlistentry>
 388                 <term><constant>GL_SAMPLE_ALPHA_TO_ONE</constant></term>
 389                 <listitem>
 390                 <para>
 391                 </para>
 392                     <para>
 393                         If enabled,
 394                         each sample alpha value is replaced by the maximum representable alpha value.
 395                     </para>
 396                 </listitem>
 397             </varlistentry>
 398             <varlistentry>
 399                 <term><constant>GL_SAMPLE_COVERAGE</constant></term>
 400                 <listitem>
 401                 <para>
 402                 </para>
 403                     <para>
 404                         If enabled,
 405                         the fragment's coverage is ANDed with the temporary coverage value.  If
 406                         <constant>GL_SAMPLE_COVERAGE_INVERT</constant> is set to <constant>GL_TRUE</constant>, invert the coverage
 407                         value.
 408                         See <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>.
 409                     </para>
 410                 </listitem>
 411             </varlistentry>
 412             <varlistentry>
 413                 <term><constant>GL_SAMPLE_SHADING</constant></term>
 414                 <listitem>
 415                 <para>
 416                 </para>
 417                     <para>
 418                         If enabled, the active fragment shader is run once for each covered sample, or at
 419                         fraction of this rate as determined by the current value of <constant>GL_MIN_SAMPLE_SHADING_VALUE</constant>.
 420                         See <citerefentry><refentrytitle>glMinSampleShading</refentrytitle></citerefentry>.
 421                     </para>
 422                 </listitem>
 423             </varlistentry>
 424             <varlistentry>
 425                 <term><constant>GL_SAMPLE_MASK</constant></term>
 426                 <listitem>
 427                 <para>
 428                 </para>
 429                     <para>
 430                         If enabled, the sample coverage mask generated for a fragment during rasterization
 431                         will be ANDed with the value of <constant>GL_SAMPLE_MASK_VALUE</constant> before
 432                         shading occurs.
 433                         See <citerefentry><refentrytitle>glSampleMaski</refentrytitle></citerefentry>.
 434                     </para>
 435                 </listitem>
 436             </varlistentry>
 437             <varlistentry>
 438                 <term><constant>GL_SCISSOR_TEST</constant></term>
 439                 <listitem>
 440                 <para>
 441                 </para>
 442                     <para>
 443                         If enabled,
 444                         discard fragments that are outside the scissor rectangle.
 445                         See <citerefentry><refentrytitle>glScissor</refentrytitle></citerefentry>.
 446                     </para>
 447                 </listitem>
 448             </varlistentry>
 449             <varlistentry>
 450                 <term><constant>GL_STENCIL_TEST</constant></term>
 451                 <listitem>
 452                 <para>
 453                 </para>
 454                     <para>
 455                         If enabled,
 456                         do stencil testing and update the stencil buffer.
 457                         See <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>.
 458                     </para>
 459                 </listitem>
 460             </varlistentry>
 461             <varlistentry>
 462                 <term><constant>GL_TEXTURE_CUBE_MAP_SEAMLESS</constant></term>
 463                 <listitem>
 464                 <para>
 465                 </para>
 466                     <para>
 467                         If enabled, cubemap textures are sampled such that when linearly sampling from the border
 468                         between two adjacent faces, texels from both faces are used to generate the final sample
 469                         value. When disabled, texels from only a single face are used to construct the final
 470                         sample value.
 471                     </para>
 472                 </listitem>
 473             </varlistentry>
 474             <varlistentry>
 475                 <term><constant>GL_PROGRAM_POINT_SIZE</constant></term>
 476                 <listitem>
 477                 <para>
 478                 </para>
 479                     <para>
 480                         If enabled
 481                         and a vertex or geometry shader is active, then the derived point size is taken from the (potentially clipped) shader builtin
 482                         <constant>gl_PointSize</constant> and clamped to the implementation-dependent point size range.
 483                     </para>
 484                 </listitem>
 485             </varlistentry>
 486         </variablelist>
 487     </refsect1>
 488     <refsect1 id="errors"><title>Errors</title>
 489         <para>
 490             <constant>GL_INVALID_ENUM</constant> is generated if <parameter>cap</parameter> is not one of the values
 491             listed previously.
 492         </para>
 493         <para>
 494             <constant>GL_INVALID_VALUE</constant> is generated by <function>glEnablei</function> and <function>glDisablei</function>
 495             if <parameter>index</parameter> is greater than or equal to the number of indexed capabilities for <parameter>cap</parameter>.
 496         </para>
 497     </refsect1>
 498     <refsect1 id="notes"><title>Notes</title>
 499         <para>
 500             <constant>GL_PRIMITIVE_RESTART</constant> is available only if the GL version is 3.1 or greater.
 501         </para>
 502         <para>
 503             <constant>GL_TEXTURE_CUBE_MAP_SEAMLESS</constant> is available only if the GL version is 3.2 or greater.
 504         </para>
 505         <para>
 506             <constant>GL_PRIMITIVE_RESTART_FIXED_INDEX</constant> is available only if the GL version is 4.3 or greater.
 507         </para>
 508         <para>
 509             <constant>GL_DEBUG_OUTPUT</constant> and <constant>GL_DEBUG_OUTPUT_SYNCHRONOUS</constant> are available only if the GL version is 4.3 or greater.
 510         </para>
 511         <para>
 512             Any token accepted by <function>glEnable</function> or <function>glDisable</function> is also accepted by
 513             <function>glEnablei</function> and <function>glDisablei</function>, but if the capability is not indexed,
 514             the maximum value that <parameter>index</parameter> may take is zero.
 515         </para>
 516         <para>
 517             In general, passing an indexed capability to <function>glEnable</function> or <function>glDisable</function>
 518             will enable or disable that capability for all indices, resepectively.
 519         </para>
 520     </refsect1>
 521     <refsect1 id="associatedgets"><title>Associated Gets</title>
 522         <para>
 523             <citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry>
 524         </para>
 525         <para>
 526             <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
 527         </para>
 528     </refsect1>
 529     <refsect1 id="seealso"><title>See Also</title>
 530         <para>
 531             <citerefentry><refentrytitle>glActiveTexture</refentrytitle></citerefentry>,
 532             <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>,
 533             <citerefentry><refentrytitle>glCullFace</refentrytitle></citerefentry>,
 534             <citerefentry><refentrytitle>glDepthFunc</refentrytitle></citerefentry>,
 535             <citerefentry><refentrytitle>glDepthRange</refentrytitle></citerefentry>,
 536             <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>,
 537             <citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry>,
 538             <citerefentry><refentrytitle>glLineWidth</refentrytitle></citerefentry>,
 539             <citerefentry><refentrytitle>glLogicOp</refentrytitle></citerefentry>,
 540             <citerefentry><refentrytitle>glPointSize</refentrytitle></citerefentry>,
 541             <citerefentry><refentrytitle>glPolygonMode</refentrytitle></citerefentry>,
 542             <citerefentry><refentrytitle>glPolygonOffset</refentrytitle></citerefentry>,
 543             <citerefentry><refentrytitle>glSampleCoverage</refentrytitle></citerefentry>,
 544             <citerefentry><refentrytitle>glScissor</refentrytitle></citerefentry>,
 545             <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry>,
 546             <citerefentry><refentrytitle>glStencilOp</refentrytitle></citerefentry>,
 547             <citerefentry><refentrytitle>glTexImage1D</refentrytitle></citerefentry>,
 548             <citerefentry><refentrytitle>glTexImage2D</refentrytitle></citerefentry>,
 549             <citerefentry><refentrytitle>glTexImage3D</refentrytitle></citerefentry>
 550         </para>
 551     </refsect1>
 552     <refsect1 id="Copyright"><title>Copyright</title>
 553         <para>
 554             Copyright <trademark class="copyright"></trademark> 1991-2006
 555             Silicon Graphics, Inc. Copyright <trademark class="copyright"></trademark> 2010-2011 Khronos Group.
 556             This document is licensed under the SGI
 557             Free Software B License. For details, see
 558             <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>.
 559         </para>
 560     </refsect1>
 561 </refentry>