upstream-man-pages/man2/xhtml/glMap2.xml

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   3 <?xml-stylesheet type="text/xsl" href="mathml.xsl"?><html xmlns="http://www.w3.org/1999/xhtml" xmlns:pref="http://www.w3.org/2002/Math/preference" pref:renderer="mathplayer-dl"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>glMap2</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glMap2"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glMap2 — define a two-dimensional evaluator</p></div><div class="refsynopsisdiv"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glMap2f</b>(</code></td><td>GLenum  </td><td><var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLfloat  </td><td><var class="pdparam">u1</var>, </td></tr><tr><td> </td><td>GLfloat  </td><td><var class="pdparam">u2</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">ustride</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">uorder</var>, </td></tr><tr><td> </td><td>GLfloat  </td><td><var class="pdparam">v1</var>, </td></tr><tr><td> </td><td>GLfloat  </td><td><var class="pdparam">v2</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">vstride</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">vorder</var>, </td></tr><tr><td> </td><td>const GLfloat *  </td><td><var class="pdparam">points</var><code>)</code>;</td></tr></table></div><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0"><tr><td><code class="funcdef">void <b class="fsfunc">glMap2d</b>(</code></td><td>GLenum  </td><td><var class="pdparam">target</var>, </td></tr><tr><td> </td><td>GLdouble  </td><td><var class="pdparam">u1</var>, </td></tr><tr><td> </td><td>GLdouble  </td><td><var class="pdparam">u2</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">ustride</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">uorder</var>, </td></tr><tr><td> </td><td>GLdouble  </td><td><var class="pdparam">v1</var>, </td></tr><tr><td> </td><td>GLdouble  </td><td><var class="pdparam">v2</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">vstride</var>, </td></tr><tr><td> </td><td>GLint  </td><td><var class="pdparam">vorder</var>, </td></tr><tr><td> </td><td>const GLdouble *  </td><td><var class="pdparam">points</var><code>)</code>;</td></tr></table></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="parameters"></a><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>target</code></em></span></dt><dd><p>
   4                     Specifies the kind of values that are generated by the evaluator.
   5                     Symbolic constants
   6                     <code class="constant">GL_MAP2_VERTEX_3</code>,
   7                     <code class="constant">GL_MAP2_VERTEX_4</code>,
   8                     <code class="constant">GL_MAP2_INDEX</code>,
   9                     <code class="constant">GL_MAP2_COLOR_4</code>,
  10                     <code class="constant">GL_MAP2_NORMAL</code>,
  11                     <code class="constant">GL_MAP2_TEXTURE_COORD_1</code>,
  12                     <code class="constant">GL_MAP2_TEXTURE_COORD_2</code>,
  13                     <code class="constant">GL_MAP2_TEXTURE_COORD_3</code>, and
  14                     <code class="constant">GL_MAP2_TEXTURE_COORD_4</code> are accepted.
  15                 </p></dd><dt><span class="term"><em class="parameter"><code>u1</code></em>, </span><span class="term"><em class="parameter"><code>u2</code></em></span></dt><dd><p>
  16                     Specify a linear mapping of
  17                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">u</mml:mi></mml:math>,
  18                     as presented to <a class="citerefentry" href="glEvalCoord2.xml"><span class="citerefentry"><span class="refentrytitle">glEvalCoord2</span></span></a>,
  19                     to
  20                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
  21
  22                         <mml:mover><mml:mi mathvariant="italic">u</mml:mi><mml:mo>̂</mml:mo></mml:mover>
  23                     </mml:math>,
  24                     one of the two variables that are evaluated by the equations specified
  25                     by this command. Initially, <em class="parameter"><code>u1</code></em> is 0 and <em class="parameter"><code>u2</code></em> is 1.
  26                 </p></dd><dt><span class="term"><em class="parameter"><code>ustride</code></em></span></dt><dd><p>
  27                     Specifies the number of floats or doubles between
  28                     the beginning of control point
  29                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
  30
  31                         <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
  32                         <mml:mi mathvariant="italic">ij</mml:mi>
  33                         </mml:msub>
  34                     </mml:math>
  35                     and the beginning of control point
  36                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
  37
  38                         <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
  39                         <mml:mfenced open="" close="">
  40                             <mml:mrow>
  41                                 <mml:mfenced open="(" close=")">
  42                                     <mml:mrow>
  43                                         <mml:mi mathvariant="italic">i</mml:mi>
  44                                         <mml:mo>+</mml:mo>
  45                                         <mml:mn>1</mml:mn>
  46                                     </mml:mrow>
  47                                 </mml:mfenced>
  48                                 <mml:mo>⁢</mml:mo>
  49                                 <mml:mi mathvariant="italic">j</mml:mi>
  50                             </mml:mrow>
  51                         </mml:mfenced>
  52                         </mml:msub>
  53                     </mml:math>,
  54                     where
  55                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math>
  56                     and
  57                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">j</mml:mi></mml:math>
  58                     are the
  59                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">u</mml:mi></mml:math>
  60                     and
  61                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">v</mml:mi></mml:math>
  62                     control point indices, respectively.
  63                     This allows control points to be embedded in arbitrary data structures.
  64                     The only constraint is that the values for a particular control point
  65                     must occupy contiguous memory locations. The initial value of <em class="parameter"><code>ustride</code></em> is 0.
  66                 </p></dd><dt><span class="term"><em class="parameter"><code>uorder</code></em></span></dt><dd><p>
  67                     Specifies the dimension of the control point array in the
  68                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">u</mml:mi></mml:math>
  69                     axis.
  70                     Must be positive. The initial value is 1.
  71                 </p></dd><dt><span class="term"><em class="parameter"><code>v1</code></em>, </span><span class="term"><em class="parameter"><code>v2</code></em></span></dt><dd><p>
  72                     Specify a linear mapping of
  73                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">v</mml:mi></mml:math>,
  74                     as presented to <a class="citerefentry" href="glEvalCoord2.xml"><span class="citerefentry"><span class="refentrytitle">glEvalCoord2</span></span></a>,
  75                     to
  76                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
  77
  78                         <mml:mover><mml:mi mathvariant="italic">v</mml:mi><mml:mo>̂</mml:mo></mml:mover>
  79                     </mml:math>,
  80                     one of the two variables that are evaluated by the equations specified
  81                     by this command. Initially, <em class="parameter"><code>v1</code></em> is 0 and <em class="parameter"><code>v2</code></em> is 1.
  82                 </p></dd><dt><span class="term"><em class="parameter"><code>vstride</code></em></span></dt><dd><p>
  83                     Specifies the number of floats or doubles between
  84                     the beginning of control point
  85                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
  86
  87                         <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
  88                         <mml:mi mathvariant="italic">ij</mml:mi>
  89                         </mml:msub>
  90                     </mml:math>
  91                     and the beginning of control point
  92                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
  93
  94                         <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
  95                         <mml:mfenced open="" close="">
  96                             <mml:mrow>
  97                                 <mml:mi mathvariant="italic">i</mml:mi>
  98                                 <mml:mo>⁡</mml:mo>
  99                                 <mml:mfenced open="(" close=")">
 100                                     <mml:mrow>
 101                                         <mml:mi mathvariant="italic">j</mml:mi>
 102                                         <mml:mo>+</mml:mo>
 103                                         <mml:mn>1</mml:mn>
 104                                     </mml:mrow>
 105                                 </mml:mfenced>
 106                             </mml:mrow>
 107                         </mml:mfenced>
 108                         </mml:msub>
 109                     </mml:math>,
 110                     where
 111                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math>
 112                     and
 113                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">j</mml:mi></mml:math>
 114                     are the
 115                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">u</mml:mi></mml:math>
 116                     and
 117                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">v</mml:mi></mml:math>
 118                     control point indices, respectively.
 119                     This allows control points to be embedded in arbitrary data structures.
 120                     The only constraint is that the values for a particular control point
 121                     must occupy contiguous memory locations. The initial value of <em class="parameter"><code>vstride</code></em> is 0.
 122                 </p></dd><dt><span class="term"><em class="parameter"><code>vorder</code></em></span></dt><dd><p>
 123                     Specifies the dimension of the control point array in the
 124                     <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">v</mml:mi></mml:math>
 125                     axis.
 126                     Must be positive. The initial value is 1.
 127                 </p></dd><dt><span class="term"><em class="parameter"><code>points</code></em></span></dt><dd><p>
 128                     Specifies a pointer to the array of control points.
 129                 </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
 130             Evaluators provide a way to use polynomial or rational polynomial mapping
 131             to produce vertices,
 132             normals,
 133             texture coordinates,
 134             and colors.
 135             The values produced by an evaluator are sent on to further stages
 136             of GL processing just as if they had been presented using
 137             <a class="citerefentry" href="glVertex.xml"><span class="citerefentry"><span class="refentrytitle">glVertex</span></span></a>,
 138             <a class="citerefentry" href="glNormal.xml"><span class="citerefentry"><span class="refentrytitle">glNormal</span></span></a>,
 139             <a class="citerefentry" href="glTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord</span></span></a>, and
 140             <a class="citerefentry" href="glColor.xml"><span class="citerefentry"><span class="refentrytitle">glColor</span></span></a> commands,
 141             except that the generated values do not update the current normal,
 142             texture coordinates,
 143             or color.
 144         </p><p>
 145             All polynomial or rational polynomial splines of any degree
 146             (up to the maximum degree supported by the GL implementation)
 147             can be described using evaluators.
 148             These include almost all surfaces used in computer graphics,
 149             including B-spline surfaces,
 150             NURBS surfaces,
 151             Bezier surfaces, and so on.
 152         </p><p>
 153             Evaluators define surfaces based on bivariate Bernstein polynomials.
 154             Define
 155             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 156
 157                 <mml:mrow>
 158                     <mml:mi mathvariant="italic">p</mml:mi>
 159                     <mml:mo>⁡</mml:mo>
 160                     <mml:mfenced open="(" close=")">
 161                         <mml:mover><mml:mi mathvariant="italic">u</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 162                         <mml:mover><mml:mi mathvariant="italic">v</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 163                     </mml:mfenced>
 164                 </mml:mrow>
 165             </mml:math>
 166             as
 167         </p><p>
 168             </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 169
 170                 <mml:mrow>
 171                     <mml:mrow>
 172                         <mml:mi mathvariant="italic">p</mml:mi>
 173                         <mml:mo>⁡</mml:mo>
 174                         <mml:mfenced open="(" close=")">
 175                             <mml:mover><mml:mi mathvariant="italic">u</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 176                             <mml:mover><mml:mi mathvariant="italic">v</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 177                         </mml:mfenced>
 178                     </mml:mrow>
 179                     <mml:mo>=</mml:mo>
 180                     <mml:mrow>
 181                         <mml:munderover>
 182                             <mml:mo>Σ</mml:mo>
 183                             <mml:mrow>
 184                                 <mml:mi mathvariant="italic">i</mml:mi>
 185                                 <mml:mo>=</mml:mo>
 186                                 <mml:mn>0</mml:mn>
 187                             </mml:mrow>
 188                             <mml:mi mathvariant="italic">n</mml:mi>
 189                         </mml:munderover>
 190                         <mml:mrow>
 191                             <mml:munderover>
 192                                 <mml:mo>Σ</mml:mo>
 193                                 <mml:mrow>
 194                                     <mml:mi mathvariant="italic">j</mml:mi>
 195                                     <mml:mo>=</mml:mo>
 196                                     <mml:mn>0</mml:mn>
 197                                 </mml:mrow>
 198                                 <mml:mi mathvariant="italic">m</mml:mi>
 199                             </mml:munderover>
 200                             <mml:mrow>
 201                                 <mml:mrow>
 202                                     <mml:msup><mml:mfenced open="" close="">
 203                                         <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
 204                                         <mml:mi mathvariant="italic">i</mml:mi>
 205                                         </mml:msub>
 206                                     </mml:mfenced>
 207                                     <mml:mi mathvariant="italic">n</mml:mi>
 208                                     </mml:msup>
 209                                     <mml:mo>⁡</mml:mo>
 210                                     <mml:mfenced open="(" close=")">
 211                                         <mml:mover><mml:mi mathvariant="italic">u</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 212                                     </mml:mfenced>
 213                                 </mml:mrow>
 214                                 <mml:mo>⁢</mml:mo>
 215                                 <mml:mrow>
 216                                     <mml:msup><mml:mfenced open="" close="">
 217                                         <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
 218                                         <mml:mi mathvariant="italic">j</mml:mi>
 219                                         </mml:msub>
 220                                     </mml:mfenced>
 221                                     <mml:mi mathvariant="italic">m</mml:mi>
 222                                     </mml:msup>
 223                                     <mml:mo>⁡</mml:mo>
 224                                     <mml:mfenced open="(" close=")">
 225                                         <mml:mover><mml:mi mathvariant="italic">v</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 226                                     </mml:mfenced>
 227                                 </mml:mrow>
 228                                 <mml:mo>⁢</mml:mo>
 229                                 <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
 230                                 <mml:mi mathvariant="italic">ij</mml:mi>
 231                                 </mml:msub>
 232                             </mml:mrow>
 233                         </mml:mrow>
 234                     </mml:mrow>
 235                 </mml:mrow>
 236             </mml:math></div><p>
 237         </p><p>
 238         </p><p>
 239             where
 240             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 241
 242                 <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
 243                 <mml:mi mathvariant="italic">ij</mml:mi>
 244                 </mml:msub>
 245             </mml:math>
 246             is a control point,
 247             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 248
 249                 <mml:mrow>
 250                     <mml:msup><mml:mfenced open="" close="">
 251                         <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
 252                         <mml:mi mathvariant="italic">i</mml:mi>
 253                         </mml:msub>
 254                     </mml:mfenced>
 255                     <mml:mi mathvariant="italic">n</mml:mi>
 256                     </mml:msup>
 257                     <mml:mo>⁡</mml:mo>
 258                     <mml:mfenced open="(" close=")">
 259                         <mml:mover><mml:mi mathvariant="italic">u</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 260                     </mml:mfenced>
 261                 </mml:mrow>
 262             </mml:math>
 263             is the
 264             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">i</mml:mi></mml:math>th
 265             Bernstein polynomial of degree
 266             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">n</mml:mi></mml:math>
 267             (<em class="parameter"><code>uorder</code></em> =
 268             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 269
 270                 <mml:mrow>
 271                     <mml:mi mathvariant="italic">n</mml:mi>
 272                     <mml:mo>+</mml:mo>
 273                     <mml:mn>1</mml:mn>
 274                 </mml:mrow>
 275             </mml:math>)
 276         </p><p>
 277             </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 278
 279                 <mml:mrow>
 280                     <mml:mrow>
 281                         <mml:msup><mml:mfenced open="" close="">
 282                             <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
 283                             <mml:mi mathvariant="italic">i</mml:mi>
 284                             </mml:msub>
 285                         </mml:mfenced>
 286                         <mml:mi mathvariant="italic">n</mml:mi>
 287                         </mml:msup>
 288                         <mml:mo>⁡</mml:mo>
 289                         <mml:mfenced open="(" close=")">
 290                             <mml:mover><mml:mi mathvariant="italic">u</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 291                         </mml:mfenced>
 292                     </mml:mrow>
 293                     <mml:mo>=</mml:mo>
 294                     <mml:mrow>
 295                         <mml:mfenced open="(" close=")">
 296                             <mml:mfenced open="" close="">
 297                                 <mml:mtable>
 298                                     <mml:mtr><mml:mtd>
 299                                         <mml:mi mathvariant="italic">n</mml:mi>
 300                                     </mml:mtd></mml:mtr>
 301                                     <mml:mtr><mml:mtd>
 302                                         <mml:mi mathvariant="italic">i</mml:mi>
 303                                     </mml:mtd></mml:mtr>
 304                                 </mml:mtable>
 305                             </mml:mfenced>
 306                         </mml:mfenced>
 307                         <mml:mo>⁢</mml:mo>
 308                         <mml:msup><mml:mfenced open="" close="">
 309                             <mml:mover><mml:mi mathvariant="italic">u</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 310                         </mml:mfenced>
 311                         <mml:mi mathvariant="italic">i</mml:mi>
 312                         </mml:msup>
 313                         <mml:mo>⁢</mml:mo>
 314                         <mml:mfenced open="" close="">
 315                             <mml:msup><mml:mfenced open="(" close=")">
 316                                 <mml:mrow>
 317                                     <mml:mn>1</mml:mn>
 318                                     <mml:mo>-</mml:mo>
 319                                     <mml:mover><mml:mi mathvariant="italic">u</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 320                                 </mml:mrow>
 321                             </mml:mfenced>
 322                             <mml:mfenced open="" close="">
 323                                 <mml:mrow>
 324                                     <mml:mi mathvariant="italic">n</mml:mi>
 325                                     <mml:mo>-</mml:mo>
 326                                     <mml:mi mathvariant="italic">i</mml:mi>
 327                                 </mml:mrow>
 328                             </mml:mfenced>
 329                             </mml:msup>
 330                         </mml:mfenced>
 331                     </mml:mrow>
 332                 </mml:mrow>
 333             </mml:math></div><p>
 334         </p><p>
 335             and
 336             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 337
 338                 <mml:mrow>
 339                     <mml:msup><mml:mfenced open="" close="">
 340                         <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
 341                         <mml:mi mathvariant="italic">j</mml:mi>
 342                         </mml:msub>
 343                     </mml:mfenced>
 344                     <mml:mi mathvariant="italic">m</mml:mi>
 345                     </mml:msup>
 346                     <mml:mo>⁡</mml:mo>
 347                     <mml:mfenced open="(" close=")">
 348                         <mml:mover><mml:mi mathvariant="italic">v</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 349                     </mml:mfenced>
 350                 </mml:mrow>
 351             </mml:math>
 352             is the
 353             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">j</mml:mi></mml:math>th
 354             Bernstein polynomial of degree
 355             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">m</mml:mi></mml:math>
 356             (<em class="parameter"><code>vorder</code></em> =
 357             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 358
 359                 <mml:mrow>
 360                     <mml:mi mathvariant="italic">m</mml:mi>
 361                     <mml:mo>+</mml:mo>
 362                     <mml:mn>1</mml:mn>
 363                 </mml:mrow>
 364             </mml:math>)
 365         </p><p>
 366             </p><div class="informalequation"><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 367
 368                 <mml:mrow>
 369                     <mml:mrow>
 370                         <mml:msup><mml:mfenced open="" close="">
 371                             <mml:msub><mml:mi mathvariant="italic">B</mml:mi>
 372                             <mml:mi mathvariant="italic">j</mml:mi>
 373                             </mml:msub>
 374                         </mml:mfenced>
 375                         <mml:mi mathvariant="italic">m</mml:mi>
 376                         </mml:msup>
 377                         <mml:mo>⁡</mml:mo>
 378                         <mml:mfenced open="(" close=")">
 379                             <mml:mover><mml:mi mathvariant="italic">v</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 380                         </mml:mfenced>
 381                     </mml:mrow>
 382                     <mml:mo>=</mml:mo>
 383                     <mml:mrow>
 384                         <mml:mfenced open="(" close=")">
 385                             <mml:mfenced open="" close="">
 386                                 <mml:mtable>
 387                                     <mml:mtr><mml:mtd>
 388                                         <mml:mi mathvariant="italic">m</mml:mi>
 389                                     </mml:mtd></mml:mtr>
 390                                     <mml:mtr><mml:mtd>
 391                                         <mml:mi mathvariant="italic">j</mml:mi>
 392                                     </mml:mtd></mml:mtr>
 393                                 </mml:mtable>
 394                             </mml:mfenced>
 395                         </mml:mfenced>
 396                         <mml:mo>⁢</mml:mo>
 397                         <mml:msup><mml:mfenced open="" close="">
 398                             <mml:mover><mml:mi mathvariant="italic">v</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 399                         </mml:mfenced>
 400                         <mml:mi mathvariant="italic">j</mml:mi>
 401                         </mml:msup>
 402                         <mml:mo>⁢</mml:mo>
 403                         <mml:mfenced open="" close="">
 404                             <mml:msup><mml:mfenced open="(" close=")">
 405                                 <mml:mrow>
 406                                     <mml:mn>1</mml:mn>
 407                                     <mml:mo>-</mml:mo>
 408                                     <mml:mover><mml:mi mathvariant="italic">v</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 409                                 </mml:mrow>
 410                             </mml:mfenced>
 411                             <mml:mfenced open="" close="">
 412                                 <mml:mrow>
 413                                     <mml:mi mathvariant="italic">m</mml:mi>
 414                                     <mml:mo>-</mml:mo>
 415                                     <mml:mi mathvariant="italic">j</mml:mi>
 416                                 </mml:mrow>
 417                             </mml:mfenced>
 418                             </mml:msup>
 419                         </mml:mfenced>
 420                     </mml:mrow>
 421                 </mml:mrow>
 422             </mml:math></div><p>
 423         </p><p>
 424             Recall that
 425             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 426
 427                 <mml:mrow>
 428                     <mml:msup><mml:mn>0</mml:mn>
 429                     <mml:mn>0</mml:mn>
 430                     </mml:msup>
 431                     <mml:mo>==</mml:mo>
 432                     <mml:mn>1</mml:mn>
 433                 </mml:mrow>
 434             </mml:math>
 435             and
 436             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 437
 438                 <mml:mrow>
 439                     <mml:mfenced open="(" close=")">
 440                         <mml:mfenced open="" close="">
 441                             <mml:mtable>
 442                                 <mml:mtr><mml:mtd>
 443                                     <mml:mi mathvariant="italic">n</mml:mi>
 444                                 </mml:mtd></mml:mtr>
 445                                 <mml:mtr><mml:mtd>
 446                                     <mml:mn>0</mml:mn>
 447                                 </mml:mtd></mml:mtr>
 448                             </mml:mtable>
 449                         </mml:mfenced>
 450                     </mml:mfenced>
 451                     <mml:mo>==</mml:mo>
 452                     <mml:mn>1</mml:mn>
 453                 </mml:mrow>
 454             </mml:math>
 455         </p><p>
 456             <code class="function">glMap2</code> is used to define the basis and to specify what kind of values
 457             are produced.
 458             Once defined,
 459             a map can be enabled and disabled by calling <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a> and <a class="citerefentry" href="glDisable.xml"><span class="citerefentry"><span class="refentrytitle">glDisable</span></span></a>
 460             with the map name, one of the nine predefined values for <em class="parameter"><code>target</code></em>,
 461             described below.
 462             When <a class="citerefentry" href="glEvalCoord2.xml"><span class="citerefentry"><span class="refentrytitle">glEvalCoord2</span></span></a> presents values
 463             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">u</mml:mi></mml:math>
 464             and
 465             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">v</mml:mi></mml:math>,
 466             the bivariate Bernstein polynomials are evaluated using
 467             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 468
 469                 <mml:mover><mml:mi mathvariant="italic">u</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 470             </mml:math>
 471             and
 472             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 473
 474                 <mml:mover><mml:mi mathvariant="italic">v</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 475             </mml:math>,
 476             where
 477         </p><p>
 478             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 479
 480                 <mml:mrow>
 481                     <mml:mover><mml:mi mathvariant="italic">u</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 482                     <mml:mo>=</mml:mo>
 483                     <mml:mfrac>
 484                         <mml:mfenced open="" close="">
 485                             <mml:mrow>
 486                                 <mml:mi mathvariant="italic">u</mml:mi>
 487                                 <mml:mo>-</mml:mo>
 488                                 <mml:mi mathvariant="italic">u1</mml:mi>
 489                             </mml:mrow>
 490                         </mml:mfenced>
 491                         <mml:mfenced open="" close="">
 492                             <mml:mrow>
 493                                 <mml:mi mathvariant="italic">u2</mml:mi>
 494                                 <mml:mo>-</mml:mo>
 495                                 <mml:mi mathvariant="italic">u1</mml:mi>
 496                             </mml:mrow>
 497                         </mml:mfenced>
 498                     </mml:mfrac>
 499                 </mml:mrow>
 500             </mml:math>
 501         </p><p>
 502             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 503
 504                 <mml:mrow>
 505                     <mml:mover><mml:mi mathvariant="italic">v</mml:mi><mml:mo>̂</mml:mo></mml:mover>
 506                     <mml:mo>=</mml:mo>
 507                     <mml:mfrac>
 508                         <mml:mfenced open="" close="">
 509                             <mml:mrow>
 510                                 <mml:mi mathvariant="italic">v</mml:mi>
 511                                 <mml:mo>-</mml:mo>
 512                                 <mml:mi mathvariant="italic">v1</mml:mi>
 513                             </mml:mrow>
 514                         </mml:mfenced>
 515                         <mml:mfenced open="" close="">
 516                             <mml:mrow>
 517                                 <mml:mi mathvariant="italic">v2</mml:mi>
 518                                 <mml:mo>-</mml:mo>
 519                                 <mml:mi mathvariant="italic">v1</mml:mi>
 520                             </mml:mrow>
 521                         </mml:mfenced>
 522                     </mml:mfrac>
 523                 </mml:mrow>
 524             </mml:math>
 525         </p><p>
 526             <em class="parameter"><code>target</code></em> is a symbolic constant that indicates what kind of control points
 527             are provided in <em class="parameter"><code>points</code></em>,
 528             and what output is generated when the map is evaluated.
 529             It can assume one of nine predefined values:
 530         </p><div class="variablelist"><dl><dt><span class="term"><code class="constant">GL_MAP2_VERTEX_3</code></span></dt><dd><p>
 531                         Each control point is three floating-point values representing
 532                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math>,
 533                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">y</mml:mi></mml:math>,
 534                         and
 535                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">z</mml:mi></mml:math>.
 536                         Internal <a class="citerefentry" href="glVertex3.xml"><span class="citerefentry"><span class="refentrytitle">glVertex3</span></span></a> commands are generated when the map is evaluated.
 537                     </p></dd><dt><span class="term"><code class="constant">GL_MAP2_VERTEX_4</code></span></dt><dd><p>
 538                         Each control point is four floating-point values representing
 539                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math>,
 540                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">y</mml:mi></mml:math>,
 541                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">z</mml:mi></mml:math>,
 542                         and
 543                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">w</mml:mi></mml:math>.
 544                         Internal <a class="citerefentry" href="glVertex4.xml"><span class="citerefentry"><span class="refentrytitle">glVertex4</span></span></a> commands are generated when the map is evaluated.
 545                     </p></dd><dt><span class="term"><code class="constant">GL_MAP2_INDEX</code></span></dt><dd><p>
 546                         Each control point is a single floating-point value representing a color index.
 547                         Internal <a class="citerefentry" href="glIndex.xml"><span class="citerefentry"><span class="refentrytitle">glIndex</span></span></a> commands are generated when the map is evaluated
 548                         but the current index is not updated with the value of these
 549                         <a class="citerefentry" href="glIndex.xml"><span class="citerefentry"><span class="refentrytitle">glIndex</span></span></a> commands.
 550                     </p></dd><dt><span class="term"><code class="constant">GL_MAP2_COLOR_4</code></span></dt><dd><p>
 551                         Each control point is four floating-point values representing
 552                         red, green, blue, and alpha.
 553                         Internal <a class="citerefentry" href="glColor4.xml"><span class="citerefentry"><span class="refentrytitle">glColor4</span></span></a> commands are generated when the map is
 554                         evaluated but the current color is not updated with the value of
 555                         these <a class="citerefentry" href="glColor4.xml"><span class="citerefentry"><span class="refentrytitle">glColor4</span></span></a> commands.
 556                     </p></dd><dt><span class="term"><code class="constant">GL_MAP2_NORMAL</code></span></dt><dd><p>
 557                         Each control point is three floating-point values representing
 558                         the
 559                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">x</mml:mi></mml:math>,
 560                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">y</mml:mi></mml:math>,
 561                         and
 562                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">z</mml:mi></mml:math>
 563                         components of a normal vector.
 564                         Internal <a class="citerefentry" href="glNormal.xml"><span class="citerefentry"><span class="refentrytitle">glNormal</span></span></a> commands are generated when the map is
 565                         evaluated but the current normal is not updated with the value of
 566                         these <a class="citerefentry" href="glNormal.xml"><span class="citerefentry"><span class="refentrytitle">glNormal</span></span></a> commands.
 567                     </p></dd><dt><span class="term"><code class="constant">GL_MAP2_TEXTURE_COORD_1</code></span></dt><dd><p>
 568                         Each control point is a single floating-point value representing
 569                         the
 570                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math>
 571                         texture coordinate.
 572                         Internal
 573                         <a class="citerefentry" href="glTexCoord1.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord1</span></span></a> commands are generated when the map is evaluated but
 574                         the current texture coordinates are not updated with the value
 575                         of these <a class="citerefentry" href="glTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord</span></span></a> commands.
 576                     </p></dd><dt><span class="term"><code class="constant">GL_MAP2_TEXTURE_COORD_2</code></span></dt><dd><p>
 577                         Each control point is two floating-point values representing
 578                         the
 579                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math>
 580                         and
 581                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">t</mml:mi></mml:math>
 582                         texture coordinates.
 583                         Internal
 584                         <a class="citerefentry" href="glTexCoord2.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord2</span></span></a> commands are generated when the map is evaluated but
 585                         the current texture coordinates are not updated with the value
 586                         of these <a class="citerefentry" href="glTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord</span></span></a> commands.
 587                     </p></dd><dt><span class="term"><code class="constant">GL_MAP2_TEXTURE_COORD_3</code></span></dt><dd><p>
 588                         Each control point is three floating-point values representing
 589                         the
 590                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math>,
 591                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">t</mml:mi></mml:math>,
 592                         and
 593                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">r</mml:mi></mml:math>
 594                         texture coordinates.
 595                         Internal <a class="citerefentry" href="glTexCoord3.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord3</span></span></a> commands are generated when the map is
 596                         evaluated but the current texture coordinates are not updated with the value
 597                         of these <a class="citerefentry" href="glTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord</span></span></a> commands.
 598                     </p></dd><dt><span class="term"><code class="constant">GL_MAP2_TEXTURE_COORD_4</code></span></dt><dd><p>
 599                         Each control point is four floating-point values representing
 600                         the
 601                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">s</mml:mi></mml:math>,
 602                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">t</mml:mi></mml:math>,
 603                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">r</mml:mi></mml:math>,
 604                         and
 605                         <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"><mml:mi mathvariant="italic">q</mml:mi></mml:math>
 606                         texture coordinates.
 607                         Internal
 608                         <a class="citerefentry" href="glTexCoord4.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord4</span></span></a> commands are generated when the map is evaluated but the current texture coordinates are not updated with the value
 609                         of these <a class="citerefentry" href="glTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord</span></span></a> commands.
 610                     </p></dd></dl></div><p>
 611             <em class="parameter"><code>ustride</code></em>,
 612             <em class="parameter"><code>uorder</code></em>,
 613             <em class="parameter"><code>vstride</code></em>,
 614             <em class="parameter"><code>vorder</code></em>, and
 615             <em class="parameter"><code>points</code></em> define the array addressing for accessing the control points.
 616             <em class="parameter"><code>points</code></em> is the location of the first control point,
 617             which occupies one, two, three, or four contiguous memory locations,
 618             depending on which map is being defined.
 619             There are
 620             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 621
 622                 <mml:mrow>
 623                     <mml:mi mathvariant="italic">uorder</mml:mi>
 624                     <mml:mo>×</mml:mo>
 625                     <mml:mi mathvariant="italic">vorder</mml:mi>
 626                 </mml:mrow>
 627             </mml:math>
 628             control points in the array.
 629             <em class="parameter"><code>ustride</code></em> specifies how many float or double locations are skipped to advance
 630             the internal memory pointer from control point
 631             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 632
 633                 <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
 634                 <mml:mfenced open="" close="">
 635                     <mml:mrow>
 636                         <mml:mi mathvariant="italic">i</mml:mi>
 637                         <mml:mo>⁢</mml:mo>
 638                         <mml:mi mathvariant="italic">j</mml:mi>
 639                     </mml:mrow>
 640                 </mml:mfenced>
 641                 </mml:msub>
 642             </mml:math>
 643             to control point
 644             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 645
 646                 <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
 647                 <mml:mfenced open="" close="">
 648                     <mml:mrow>
 649                         <mml:mfenced open="(" close=")">
 650                             <mml:mrow>
 651                                 <mml:mi mathvariant="italic">i</mml:mi>
 652                                 <mml:mo>+</mml:mo>
 653                                 <mml:mn>1</mml:mn>
 654                             </mml:mrow>
 655                         </mml:mfenced>
 656                         <mml:mo>⁢</mml:mo>
 657                         <mml:mi mathvariant="italic">j</mml:mi>
 658                     </mml:mrow>
 659                 </mml:mfenced>
 660                 </mml:msub>
 661             </mml:math>.
 662             <em class="parameter"><code>vstride</code></em> specifies how many float or double locations are skipped to advance
 663             the internal memory pointer from control point
 664             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 665
 666                 <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
 667                 <mml:mfenced open="" close="">
 668                     <mml:mrow>
 669                         <mml:mi mathvariant="italic">i</mml:mi>
 670                         <mml:mo>⁢</mml:mo>
 671                         <mml:mi mathvariant="italic">j</mml:mi>
 672                     </mml:mrow>
 673                 </mml:mfenced>
 674                 </mml:msub>
 675             </mml:math>
 676             to control point
 677             <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll">
 678
 679                 <mml:msub><mml:mi mathvariant="italic">R</mml:mi>
 680                 <mml:mfenced open="" close="">
 681                     <mml:mrow>
 682                         <mml:mi mathvariant="italic">i</mml:mi>
 683                         <mml:mo>⁡</mml:mo>
 684                         <mml:mfenced open="(" close=")">
 685                             <mml:mrow>
 686                                 <mml:mi mathvariant="italic">j</mml:mi>
 687                                 <mml:mo>+</mml:mo>
 688                                 <mml:mn>1</mml:mn>
 689                             </mml:mrow>
 690                         </mml:mfenced>
 691                     </mml:mrow>
 692                 </mml:mfenced>
 693                 </mml:msub>
 694             </mml:math>.
 695         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
 696             As is the case with all GL commands that accept pointers to data,
 697             it is as if the contents of <em class="parameter"><code>points</code></em> were copied by <code class="function">glMap2</code> before <code class="function">glMap2</code>
 698             returns.
 699             Changes to the contents of <em class="parameter"><code>points</code></em> have no effect after <code class="function">glMap2</code> is called.
 700         </p><p>
 701             Initially, <code class="constant">GL_AUTO_NORMAL</code> is enabled. If <code class="constant">GL_AUTO_NORMAL</code> is enabled,
 702             normal vectors are generated when either
 703             <code class="constant">GL_MAP2_VERTEX_3</code> or <code class="constant">GL_MAP2_VERTEX_4</code> is used to generate
 704             vertices.
 705         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
 706             <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>target</code></em> is not an accepted value.
 707         </p><p>
 708             <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>u1</code></em> is equal to <em class="parameter"><code>u2</code></em>,
 709             or if <em class="parameter"><code>v1</code></em> is equal to <em class="parameter"><code>v2</code></em>.
 710         </p><p>
 711             <code class="constant">GL_INVALID_VALUE</code> is generated if either <em class="parameter"><code>ustride</code></em> or <em class="parameter"><code>vstride</code></em>
 712             is less than the number of values in a control point.
 713         </p><p>
 714             <code class="constant">GL_INVALID_VALUE</code> is generated if either <em class="parameter"><code>uorder</code></em> or <em class="parameter"><code>vorder</code></em>
 715             is less than 1 or greater than the return value of <code class="constant">GL_MAX_EVAL_ORDER</code>.
 716         </p><p>
 717             <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glMap2</code>
 718             is executed between the execution of
 719             <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a>
 720             and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>.
 721         </p><p>
 722             <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glMap2</code> is called and the value
 723             of <code class="constant">GL_ACTIVE_TEXTURE</code> is not <code class="constant">GL_TEXTURE0</code>.
 724         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="associatedgets"></a><h2>Associated Gets</h2><p>
 725             <a class="citerefentry" href="glGetMap.xml"><span class="citerefentry"><span class="refentrytitle">glGetMap</span></span></a>
 726         </p><p>
 727             <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> with argument <code class="constant">GL_MAX_EVAL_ORDER</code>
 728         </p><p>
 729             <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_MAP2_VERTEX_3</code>
 730         </p><p>
 731             <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_MAP2_VERTEX_4</code>
 732         </p><p>
 733             <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_MAP2_INDEX</code>
 734         </p><p>
 735             <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_MAP2_COLOR_4</code>
 736         </p><p>
 737             <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_MAP2_NORMAL</code>
 738         </p><p>
 739             <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_MAP2_TEXTURE_COORD_1</code>
 740         </p><p>
 741             <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_MAP2_TEXTURE_COORD_2</code>
 742         </p><p>
 743             <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_MAP2_TEXTURE_COORD_3</code>
 744         </p><p>
 745             <a class="citerefentry" href="glIsEnabled.xml"><span class="citerefentry"><span class="refentrytitle">glIsEnabled</span></span></a> with argument <code class="constant">GL_MAP2_TEXTURE_COORD_4</code>
 746         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
 747             <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a>,
 748             <a class="citerefentry" href="glColor.xml"><span class="citerefentry"><span class="refentrytitle">glColor</span></span></a>,
 749             <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,
 750             <a class="citerefentry" href="glEvalCoord.xml"><span class="citerefentry"><span class="refentrytitle">glEvalCoord</span></span></a>,
 751             <a class="citerefentry" href="glEvalMesh.xml"><span class="citerefentry"><span class="refentrytitle">glEvalMesh</span></span></a>,
 752             <a class="citerefentry" href="glEvalPoint.xml"><span class="citerefentry"><span class="refentrytitle">glEvalPoint</span></span></a>,
 753             <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a>,
 754             <a class="citerefentry" href="glMapGrid.xml"><span class="citerefentry"><span class="refentrytitle">glMapGrid</span></span></a>,
 755             <a class="citerefentry" href="glNormal.xml"><span class="citerefentry"><span class="refentrytitle">glNormal</span></span></a>,
 756             <a class="citerefentry" href="glTexCoord.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoord</span></span></a>,
 757             <a class="citerefentry" href="glVertex.xml"><span class="citerefentry"><span class="refentrytitle">glVertex</span></span></a>
 758         </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
 759             Copyright <span class="trademark"></span>© 1991-2006
 760             Silicon Graphics, Inc. This document is licensed under the SGI
 761             Free Software B License. For details, see
 762             <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
 763         </p></div></div></body></html>