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AW		 1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd">
2<!-- saved from url=(0013)about:internet -->
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>glIsEnabled</title><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /></head><body><div class="refentry" lang="en" xml:lang="en"><a id="glIsEnabled"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glIsEnabled — test whether a capability is enabled</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">GLboolean <b class="fsfunc">glIsEnabled</b>(</code></td><td>GLenum  </td><td><var class="pdparam">cap</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>cap</code></em></span></dt><dd><p>
4 Specifies a symbolic constant indicating a GL capability.
5 </p></dd></dl></div></div><div class="refsect1" lang="en" xml:lang="en"><a id="description"></a><h2>Description</h2><p>
6 <code class="function">glIsEnabled</code> returns <code class="constant">GL_TRUE</code> if <em class="parameter"><code>cap</code></em> is an enabled capability
7 and returns <code class="constant">GL_FALSE</code> otherwise.
8 Initially all capabilities except <code class="constant">GL_DITHER</code> are disabled;
9 <code class="constant">GL_DITHER</code> is initially enabled.
10 </p><p>
11 The following capabilities are accepted for <em class="parameter"><code>cap</code></em>:
12 </p><p>
13 </p><div class="informaltable"><table border="1"><colgroup><col align="left" /><col align="left" /></colgroup><thead><tr><th align="left"><span class="bold"><strong>
14 Constant
15 </strong></span></th><th align="left"><span class="bold"><strong>
16 See
17 </strong></span></th></tr></thead><tbody><tr><td align="left">
18 <code class="constant">GL_ALPHA_TEST</code>
19 </td><td align="left">
20 <a class="citerefentry" href="glAlphaFunc.xml"><span class="citerefentry"><span class="refentrytitle">glAlphaFunc</span></span></a>
21 </td></tr><tr><td align="left">
22 <code class="constant">GL_AUTO_NORMAL</code>
23 </td><td align="left">
24 <a class="citerefentry" href="glEvalCoord.xml"><span class="citerefentry"><span class="refentrytitle">glEvalCoord</span></span></a>
25 </td></tr><tr><td align="left">
26 <code class="constant">GL_BLEND</code>
27 </td><td align="left">
28 <a class="citerefentry" href="glBlendFunc.xml"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a>, <a class="citerefentry" href="glLogicOp.xml"><span class="citerefentry"><span class="refentrytitle">glLogicOp</span></span></a>
29 </td></tr><tr><td align="left">
30 <code class="constant">GL_CLIP_PLANE</code><span class="emphasis"><em>i</em></span>
31 </td><td align="left">
32 <a class="citerefentry" href="glClipPlane.xml"><span class="citerefentry"><span class="refentrytitle">glClipPlane</span></span></a>
33 </td></tr><tr><td align="left">
34 <code class="constant">GL_COLOR_ARRAY</code>
35 </td><td align="left">
36 <a class="citerefentry" href="glColorPointer.xml"><span class="citerefentry"><span class="refentrytitle">glColorPointer</span></span></a>
37 </td></tr><tr><td align="left">
38 <code class="constant">GL_COLOR_LOGIC_OP</code>
39 </td><td align="left">
40 <a class="citerefentry" href="glLogicOp.xml"><span class="citerefentry"><span class="refentrytitle">glLogicOp</span></span></a>
41 </td></tr><tr><td align="left">
42 <code class="constant">GL_COLOR_MATERIAL</code>
43 </td><td align="left">
44 <a class="citerefentry" href="glColorMaterial.xml"><span class="citerefentry"><span class="refentrytitle">glColorMaterial</span></span></a>
45 </td></tr><tr><td align="left">
46 <code class="constant">GL_COLOR_SUM</code>
47 </td><td align="left">
48 <a class="citerefentry" href="glSecondaryColor.xml"><span class="citerefentry"><span class="refentrytitle">glSecondaryColor</span></span></a>
49 </td></tr><tr><td align="left">
50 <code class="constant">GL_COLOR_TABLE</code>
51 </td><td align="left">
52 <a class="citerefentry" href="glColorTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>
53 </td></tr><tr><td align="left">
54 <code class="constant">GL_CONVOLUTION_1D</code>
55 </td><td align="left">
56 <a class="citerefentry" href="glConvolutionFilter1D.xml"><span class="citerefentry"><span class="refentrytitle">glConvolutionFilter1D</span></span></a>
57 </td></tr><tr><td align="left">
58 <code class="constant">GL_CONVOLUTION_2D</code>
59 </td><td align="left">
60 <a class="citerefentry" href="glConvolutionFilter2D.xml"><span class="citerefentry"><span class="refentrytitle">glConvolutionFilter2D</span></span></a>
61 </td></tr><tr><td align="left">
62 <code class="constant">GL_CULL_FACE</code>
63 </td><td align="left">
64 <a class="citerefentry" href="glCullFace.xml"><span class="citerefentry"><span class="refentrytitle">glCullFace</span></span></a>
65 </td></tr><tr><td align="left">
66 <code class="constant">GL_DEPTH_TEST</code>
67 </td><td align="left">
68 <a class="citerefentry" href="glDepthFunc.xml"><span class="citerefentry"><span class="refentrytitle">glDepthFunc</span></span></a>, <a class="citerefentry" href="glDepthRange.xml"><span class="citerefentry"><span class="refentrytitle">glDepthRange</span></span></a>
69 </td></tr><tr><td align="left">
70 <code class="constant">GL_DITHER</code>
71 </td><td align="left">
72 <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
73 </td></tr><tr><td align="left">
74 <code class="constant">GL_EDGE_FLAG_ARRAY</code>
75 </td><td align="left">
76 <a class="citerefentry" href="glEdgeFlagPointer.xml"><span class="citerefentry"><span class="refentrytitle">glEdgeFlagPointer</span></span></a>
77 </td></tr><tr><td align="left">
78 <code class="constant">GL_FOG</code>
79 </td><td align="left">
80 <a class="citerefentry" href="glFog.xml"><span class="citerefentry"><span class="refentrytitle">glFog</span></span></a>
81 </td></tr><tr><td align="left">
82 <code class="constant">GL_FOG_COORD_ARRAY</code>
83 </td><td align="left">
84 <a class="citerefentry" href="glFogCoordPointer.xml"><span class="citerefentry"><span class="refentrytitle">glFogCoordPointer</span></span></a>
85 </td></tr><tr><td align="left">
86 <code class="constant">GL_HISTOGRAM</code>
87 </td><td align="left">
88 <a class="citerefentry" href="glHistogram.xml"><span class="citerefentry"><span class="refentrytitle">glHistogram</span></span></a>
89 </td></tr><tr><td align="left">
90 <code class="constant">GL_INDEX_ARRAY</code>
91 </td><td align="left">
92 <a class="citerefentry" href="glIndexPointer.xml"><span class="citerefentry"><span class="refentrytitle">glIndexPointer</span></span></a>
93 </td></tr><tr><td align="left">
94 <code class="constant">GL_INDEX_LOGIC_OP</code>
95 </td><td align="left">
96 <a class="citerefentry" href="glLogicOp.xml"><span class="citerefentry"><span class="refentrytitle">glLogicOp</span></span></a>
97 </td></tr><tr><td align="left">
98 <code class="constant">GL_LIGHT</code><span class="emphasis"><em>i</em></span>
99 </td><td align="left">
100 <a class="citerefentry" href="glLightModel.xml"><span class="citerefentry"><span class="refentrytitle">glLightModel</span></span></a>, <a class="citerefentry" href="glLight.xml"><span class="citerefentry"><span class="refentrytitle">glLight</span></span></a>
101 </td></tr><tr><td align="left">
102 <code class="constant">GL_LIGHTING</code>
103 </td><td align="left">
104 <a class="citerefentry" href="glMaterial.xml"><span class="citerefentry"><span class="refentrytitle">glMaterial</span></span></a>, <a class="citerefentry" href="glLightModel.xml"><span class="citerefentry"><span class="refentrytitle">glLightModel</span></span></a>, <a class="citerefentry" href="glLight.xml"><span class="citerefentry"><span class="refentrytitle">glLight</span></span></a>
105 </td></tr><tr><td align="left">
106 <code class="constant">GL_LINE_SMOOTH</code>
107 </td><td align="left">
108 <a class="citerefentry" href="glLineWidth.xml"><span class="citerefentry"><span class="refentrytitle">glLineWidth</span></span></a>
109 </td></tr><tr><td align="left">
110 <code class="constant">GL_LINE_STIPPLE</code>
111 </td><td align="left">
112 <a class="citerefentry" href="glLineStipple.xml"><span class="citerefentry"><span class="refentrytitle">glLineStipple</span></span></a>
113 </td></tr><tr><td align="left">
114 <code class="constant">GL_MAP1_COLOR_4</code>
115 </td><td align="left">
116 <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a>
117 </td></tr><tr><td align="left">
118 <code class="constant">GL_MAP1_INDEX</code>
119 </td><td align="left">
120 <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a>
121 </td></tr><tr><td align="left">
122 <code class="constant">GL_MAP1_NORMAL</code>
123 </td><td align="left">
124 <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a>
125 </td></tr><tr><td align="left">
126 <code class="constant">GL_MAP1_TEXTURE_COORD_1</code>
127 </td><td align="left">
128 <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a>
129 </td></tr><tr><td align="left">
130 <code class="constant">GL_MAP1_TEXTURE_COORD_2</code>
131 </td><td align="left">
132 <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a>
133 </td></tr><tr><td align="left">
134 <code class="constant">GL_MAP1_TEXTURE_COORD_3</code>
135 </td><td align="left">
136 <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a>
137 </td></tr><tr><td align="left">
138 <code class="constant">GL_MAP1_TEXTURE_COORD_4</code>
139 </td><td align="left">
140 <a class="citerefentry" href="glMap1.xml"><span class="citerefentry"><span class="refentrytitle">glMap1</span></span></a>
141 </td></tr><tr><td align="left">
142 <code class="constant">GL_MAP2_COLOR_4</code>
143 </td><td align="left">
144 <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a>
145 </td></tr><tr><td align="left">
146 <code class="constant">GL_MAP2_INDEX</code>
147 </td><td align="left">
148 <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a>
149 </td></tr><tr><td align="left">
150 <code class="constant">GL_MAP2_NORMAL</code>
151 </td><td align="left">
152 <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a>
153 </td></tr><tr><td align="left">
154 <code class="constant">GL_MAP2_TEXTURE_COORD_1</code>
155 </td><td align="left">
156 <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a>
157 </td></tr><tr><td align="left">
158 <code class="constant">GL_MAP2_TEXTURE_COORD_2</code>
159 </td><td align="left">
160 <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a>
161 </td></tr><tr><td align="left">
162 <code class="constant">GL_MAP2_TEXTURE_COORD_3</code>
163 </td><td align="left">
164 <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a>
165 </td></tr><tr><td align="left">
166 <code class="constant">GL_MAP2_TEXTURE_COORD_4</code>
167 </td><td align="left">
168 <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a>
169 </td></tr><tr><td align="left">
170 <code class="constant">GL_MAP2_VERTEX_3</code>
171 </td><td align="left">
172 <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a>
173 </td></tr><tr><td align="left">
174 <code class="constant">GL_MAP2_VERTEX_4</code>
175 </td><td align="left">
176 <a class="citerefentry" href="glMap2.xml"><span class="citerefentry"><span class="refentrytitle">glMap2</span></span></a>
177 </td></tr><tr><td align="left">
178 <code class="constant">GL_MINMAX</code>
179 </td><td align="left">
180 <a class="citerefentry" href="glMinmax.xml"><span class="citerefentry"><span class="refentrytitle">glMinmax</span></span></a>
181 </td></tr><tr><td align="left">
182 <code class="constant">GL_MULTISAMPLE</code>
183 </td><td align="left">
184 <a class="citerefentry" href="glSampleCoverage.xml"><span class="citerefentry"><span class="refentrytitle">glSampleCoverage</span></span></a>
185 </td></tr><tr><td align="left">
186 <code class="constant">GL_NORMAL_ARRAY</code>
187 </td><td align="left">
188 <a class="citerefentry" href="glNormalPointer.xml"><span class="citerefentry"><span class="refentrytitle">glNormalPointer</span></span></a>
189 </td></tr><tr><td align="left">
190 <code class="constant">GL_NORMALIZE</code>
191 </td><td align="left">
192 <a class="citerefentry" href="glNormal.xml"><span class="citerefentry"><span class="refentrytitle">glNormal</span></span></a>
193 </td></tr><tr><td align="left">
194 <code class="constant">GL_POINT_SMOOTH</code>
195 </td><td align="left">
196 <a class="citerefentry" href="glPointSize.xml"><span class="citerefentry"><span class="refentrytitle">glPointSize</span></span></a>
197 </td></tr><tr><td align="left">
198 <code class="constant">GL_POINT_SPRITE</code>
199 </td><td align="left">
200 <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
201 </td></tr><tr><td align="left">
202 <code class="constant">GL_POLYGON_SMOOTH</code>
203 </td><td align="left">
204 <a class="citerefentry" href="glPolygonMode.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonMode</span></span></a>
205 </td></tr><tr><td align="left">
206 <code class="constant">GL_POLYGON_OFFSET_FILL</code>
207 </td><td align="left">
208 <a class="citerefentry" href="glPolygonOffset.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonOffset</span></span></a>
209 </td></tr><tr><td align="left">
210 <code class="constant">GL_POLYGON_OFFSET_LINE</code>
211 </td><td align="left">
212 <a class="citerefentry" href="glPolygonOffset.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonOffset</span></span></a>
213 </td></tr><tr><td align="left">
214 <code class="constant">GL_POLYGON_OFFSET_POINT</code>
215 </td><td align="left">
216 <a class="citerefentry" href="glPolygonOffset.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonOffset</span></span></a>
217 </td></tr><tr><td align="left">
218 <code class="constant">GL_POLYGON_STIPPLE</code>
219 </td><td align="left">
220 <a class="citerefentry" href="glPolygonStipple.xml"><span class="citerefentry"><span class="refentrytitle">glPolygonStipple</span></span></a>
221 </td></tr><tr><td align="left">
222 <code class="constant">GL_POST_COLOR_MATRIX_COLOR_TABLE</code>
223 </td><td align="left">
224 <a class="citerefentry" href="glColorTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>
225 </td></tr><tr><td align="left">
226 <code class="constant">GL_POST_CONVOLUTION_COLOR_TABLE</code>
227 </td><td align="left">
228 <a class="citerefentry" href="glColorTable.xml"><span class="citerefentry"><span class="refentrytitle">glColorTable</span></span></a>
229 </td></tr><tr><td align="left">
230 <code class="constant">GL_RESCALE_NORMAL</code>
231 </td><td align="left">
232 <a class="citerefentry" href="glNormal.xml"><span class="citerefentry"><span class="refentrytitle">glNormal</span></span></a>
233 </td></tr><tr><td align="left">
234 <code class="constant">GL_SAMPLE_ALPHA_TO_COVERAGE</code>
235 </td><td align="left">
236 <a class="citerefentry" href="glSampleCoverage.xml"><span class="citerefentry"><span class="refentrytitle">glSampleCoverage</span></span></a>
237 </td></tr><tr><td align="left">
238 <code class="constant">GL_SAMPLE_ALPHA_TO_ONE</code>
239 </td><td align="left">
240 <a class="citerefentry" href="glSampleCoverage.xml"><span class="citerefentry"><span class="refentrytitle">glSampleCoverage</span></span></a>
241 </td></tr><tr><td align="left">
242 <code class="constant">GL_SAMPLE_COVERAGE</code>
243 </td><td align="left">
244 <a class="citerefentry" href="glSampleCoverage.xml"><span class="citerefentry"><span class="refentrytitle">glSampleCoverage</span></span></a>
245 </td></tr><tr><td align="left">
246 <code class="constant">GL_SCISSOR_TEST</code>
247 </td><td align="left">
248 <a class="citerefentry" href="glScissor.xml"><span class="citerefentry"><span class="refentrytitle">glScissor</span></span></a>
249 </td></tr><tr><td align="left">
250 <code class="constant">GL_SECONDARY_COLOR_ARRAY</code>
251 </td><td align="left">
252 <a class="citerefentry" href="glSecondaryColorPointer.xml"><span class="citerefentry"><span class="refentrytitle">glSecondaryColorPointer</span></span></a>
253 </td></tr><tr><td align="left">
254 <code class="constant">GL_SEPARABLE_2D</code>
255 </td><td align="left">
256 <a class="citerefentry" href="glSeparableFilter2D.xml"><span class="citerefentry"><span class="refentrytitle">glSeparableFilter2D</span></span></a>
257 </td></tr><tr><td align="left">
258 <code class="constant">GL_STENCIL_TEST</code>
259 </td><td align="left">
260 <a class="citerefentry" href="glStencilFunc.xml"><span class="citerefentry"><span class="refentrytitle">glStencilFunc</span></span></a>, <a class="citerefentry" href="glStencilOp.xml"><span class="citerefentry"><span class="refentrytitle">glStencilOp</span></span></a>
261 </td></tr><tr><td align="left">
262 <code class="constant">GL_TEXTURE_1D</code>
263 </td><td align="left">
264 <a class="citerefentry" href="glTexImage1D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage1D</span></span></a>
265 </td></tr><tr><td align="left">
266 <code class="constant">GL_TEXTURE_2D</code>
267 </td><td align="left">
268 <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>
269 </td></tr><tr><td align="left">
270 <code class="constant">GL_TEXTURE_3D</code>
271 </td><td align="left">
272 <a class="citerefentry" href="glTexImage3D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage3D</span></span></a>
273 </td></tr><tr><td align="left">
274 <code class="constant">GL_TEXTURE_COORD_ARRAY</code>
275 </td><td align="left">
276 <a class="citerefentry" href="glTexCoordPointer.xml"><span class="citerefentry"><span class="refentrytitle">glTexCoordPointer</span></span></a>
277 </td></tr><tr><td align="left">
278 <code class="constant">GL_TEXTURE_CUBE_MAP</code>
279 </td><td align="left">
280 <a class="citerefentry" href="glTexImage2D.xml"><span class="citerefentry"><span class="refentrytitle">glTexImage2D</span></span></a>
281 </td></tr><tr><td align="left">
282 <code class="constant">GL_TEXTURE_GEN_Q</code>
283 </td><td align="left">
284 <a class="citerefentry" href="glTexGen.xml"><span class="citerefentry"><span class="refentrytitle">glTexGen</span></span></a>
285 </td></tr><tr><td align="left">
286 <code class="constant">GL_TEXTURE_GEN_R</code>
287 </td><td align="left">
288 <a class="citerefentry" href="glTexGen.xml"><span class="citerefentry"><span class="refentrytitle">glTexGen</span></span></a>
289 </td></tr><tr><td align="left">
290 <code class="constant">GL_TEXTURE_GEN_S</code>
291 </td><td align="left">
292 <a class="citerefentry" href="glTexGen.xml"><span class="citerefentry"><span class="refentrytitle">glTexGen</span></span></a>
293 </td></tr><tr><td align="left">
294 <code class="constant">GL_TEXTURE_GEN_T</code>
295 </td><td align="left">
296 <a class="citerefentry" href="glTexGen.xml"><span class="citerefentry"><span class="refentrytitle">glTexGen</span></span></a>
297 </td></tr><tr><td align="left">
298 <code class="constant">GL_VERTEX_ARRAY</code>
299 </td><td align="left">
300 <a class="citerefentry" href="glVertexPointer.xml"><span class="citerefentry"><span class="refentrytitle">glVertexPointer</span></span></a>
301 </td></tr><tr><td align="left">
302 <code class="constant">GL_VERTEX_PROGRAM_POINT_SIZE</code>
303 </td><td align="left">
304 <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
305 </td></tr><tr><td align="left">
306 <code class="constant">GL_VERTEX_PROGRAM_TWO_SIDE</code>
307 </td><td align="left">
308 <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>
309 </td></tr></tbody></table></div><p>
310 </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="notes"></a><h2>Notes</h2><p>
311 If an error is generated,
312 <code class="function">glIsEnabled</code> returns 0.
313 </p><p>
314 <code class="constant">GL_COLOR_LOGIC_OP</code>,
315 <code class="constant">GL_COLOR_ARRAY</code>,
316 <code class="constant">GL_EDGE_FLAG_ARRAY</code>,
317 <code class="constant">GL_INDEX_ARRAY</code>,
318 <code class="constant">GL_INDEX_LOGIC_OP</code>,
319 <code class="constant">GL_NORMAL_ARRAY</code>,
320 <code class="constant">GL_POLYGON_OFFSET_FILL</code>,
321 <code class="constant">GL_POLYGON_OFFSET_LINE</code>,
322 <code class="constant">GL_POLYGON_OFFSET_POINT</code>,
323 <code class="constant">GL_TEXTURE_COORD_ARRAY</code>, and
324 <code class="constant">GL_VERTEX_ARRAY</code>
325 are available only
326 if the GL version is 1.1 or greater.
327 </p><p>
328 <code class="constant">GL_RESCALE_NORMAL</code>, and <code class="constant">GL_TEXTURE_3D</code> are available only if the GL
329 version is 1.2 or greater.
330 </p><p>
331 <code class="constant">GL_MULTISAMPLE</code>,
332 <code class="constant">GL_SAMPLE_ALPHA_TO_COVERAGE</code>,
333 <code class="constant">GL_SAMPLE_ALPHA_TO_ONE</code>,
334 <code class="constant">GL_SAMPLE_COVERAGE</code>,
335 <code class="constant">GL_TEXTURE_CUBE_MAP</code>
336 are available only if the GL version is 1.3 or greater.
337 </p><p>
338 <code class="constant">GL_FOG_COORD_ARRAY</code> and <code class="constant">GL_SECONDARY_COLOR_ARRAY</code>
339 are available only if the GL version is 1.4 or greater.
340 </p><p>
341 <code class="constant">GL_POINT_SPRITE</code>,
342 <code class="constant">GL_VERTEX_PROGRAM_POINT_SIZE</code>, and
343 <code class="constant">GL_VERTEX_PROGRAM_TWO_SIDE</code>
344 are available only if the GL version is 2.0 or greater.
345 </p><p>
346 <code class="constant">GL_COLOR_TABLE</code>, <code class="constant">GL_CONVOLUTION_1D</code>, <code class="constant">GL_CONVOLUTION_2D</code>,
347 <code class="constant">GL_HISTOGRAM</code>, <code class="constant">GL_MINMAX</code>,
348 <code class="constant">GL_POST_COLOR_MATRIX_COLOR_TABLE</code>,
349 <code class="constant">GL_POST_CONVOLUTION_COLOR_TABLE</code>, and
350 <code class="constant">GL_SEPARABLE_2D</code> are available only if <code class="code">ARB_imaging</code> is
351 returned when <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a> is called with <code class="constant">GL_EXTENSIONS</code>.
352 </p><p>
353 For OpenGL versions 1.3 and greater, or when the <code class="code">ARB_multitexture</code> extension is supported, the following
354 parameters return the associated value for the active texture unit:
355 <code class="constant">GL_TEXTURE_1D</code>,
356 <code class="constant">GL_TEXTURE_2D</code>,
357 <code class="constant">GL_TEXTURE_3D</code>,
358 <code class="constant">GL_TEXTURE_CUBE_MAP</code>,
359 <code class="constant">GL_TEXTURE_GEN_S</code>,
360 <code class="constant">GL_TEXTURE_GEN_T</code>,
361 <code class="constant">GL_TEXTURE_GEN_R</code>,
362 <code class="constant">GL_TEXTURE_GEN_Q</code>,
363 <code class="constant">GL_TEXTURE_MATRIX</code>, and
364 <code class="constant">GL_TEXTURE_STACK_DEPTH</code>.
365 Likewise, the following parameters return the associated value for the
366 active client texture unit:
367 <code class="constant">GL_TEXTURE_COORD_ARRAY</code>,
368 <code class="constant">GL_TEXTURE_COORD_ARRAY_SIZE</code>,
369 <code class="constant">GL_TEXTURE_COORD_ARRAY_STRIDE</code>,
370 <code class="constant">GL_TEXTURE_COORD_ARRAY_TYPE</code>.
371 </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="errors"></a><h2>Errors</h2><p>
372 <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>cap</code></em> is not an accepted value.
373 </p><p>
374 <code class="constant">GL_INVALID_OPERATION</code> is generated if <code class="function">glIsEnabled</code>
375 is executed between the execution of <a class="citerefentry" href="glBegin.xml"><span class="citerefentry"><span class="refentrytitle">glBegin</span></span></a>
376 and the corresponding execution of <a class="citerefentry" href="glEnd.xml"><span class="citerefentry"><span class="refentrytitle">glEnd</span></span></a>.
377 </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="seealso"></a><h2>See Also</h2><p>
378 <a class="citerefentry" href="glEnable.xml"><span class="citerefentry"><span class="refentrytitle">glEnable</span></span></a>,
379 <a class="citerefentry" href="glEnableClientState.xml"><span class="citerefentry"><span class="refentrytitle">glEnableClientState</span></span></a>,
380 <a class="citerefentry" href="glGet.xml"><span class="citerefentry"><span class="refentrytitle">glGet</span></span></a>
381 </p></div><div class="refsect1" lang="en" xml:lang="en"><a id="Copyright"></a><h2>Copyright</h2><p>
382 Copyright <span class="trademark"></span>© 1991-2006
383 Silicon Graphics, Inc. This document is licensed under the SGI
384 Free Software B License. For details, see
385 <a class="ulink" href="http://oss.sgi.com/projects/FreeB/" target="_top">http://oss.sgi.com/projects/FreeB/</a>.
386 </p></div></div></body></html>
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