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"opengl-man.css" /><title>glIsEnabled - OpenGL
3.3 Reference Pages
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.69.1" /></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, glIsEnabledi — test whether a capability is enabled
</p></div><div class=
"refsynopsisdiv"><h2>C Specification
</h2><div class=
"funcsynopsis"><p><code class=
"funcdef">GLboolean
<b class=
"fsfunc">glIsEnabled
</b>(
</code>GLenum
<var class=
"pdparam">cap
</var><code>)
</code>;
</p></div><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">GLboolean
<b class=
"fsfunc">glIsEnabledi
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">cap
</var>,
</td></tr><tr><td> </td><td>GLuint
</td><td><var class=
"pdparam">index
</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>
5 Specifies a symbolic constant indicating a GL capability.
6 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>index
</code></em></span></dt><dd><p>
7 Specifies the index of the capability.
8 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
9 <code class=
"function">glIsEnabled
</code> returns
<code class=
"constant">GL_TRUE
</code> if
<em class=
"parameter"><code>cap
</code></em> is an enabled capability
10 and returns
<code class=
"constant">GL_FALSE
</code> otherwise. Boolean states that are indexed may be tested with
<code class=
"function">glIsEnabledi
</code>.
11 For
<code class=
"function">glIsEnabledi
</code>,
<em class=
"parameter"><code>index
</code></em> specifies the index of the capability to test.
<em class=
"parameter"><code>index
</code></em>
12 must be between zero and the count of indexed capabilities for
<em class=
"parameter"><code>cap
</code></em>.
13 Initially all capabilities except
<code class=
"constant">GL_DITHER
</code> are disabled;
14 <code class=
"constant">GL_DITHER
</code> is initially enabled.
16 The following capabilities are accepted for
<em class=
"parameter"><code>cap
</code></em>:
18 </p><div class=
"informaltable"><table border=
"1"><colgroup><col align=
"left" /><col align=
"left" /></colgroup><thead><tr><th align=
"left"><span class=
"bold"><strong>
20 </strong></span></th><th align=
"left"><span class=
"bold"><strong>
22 </strong></span></th></tr></thead><tbody><tr><td align=
"left">
23 <code class=
"constant">GL_BLEND
</code>
24 </td><td align=
"left">
25 <a href=
"glBlendFunc.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBlendFunc
</span></span></a>,
<a href=
"glLogicOp.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glLogicOp
</span></span></a>
26 </td></tr><tr><td align=
"left">
27 <code class=
"constant">GL_CLIP_DISTANCE
</code><span class=
"emphasis"><em>i
</em></span>
28 </td><td align=
"left">
29 <a href=
"glEnable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnable
</span></span></a>
30 </td></tr><tr><td align=
"left">
31 <code class=
"constant">GL_COLOR_LOGIC_OP
</code>
32 </td><td align=
"left">
33 <a href=
"glLogicOp.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glLogicOp
</span></span></a>
34 </td></tr><tr><td align=
"left">
35 <code class=
"constant">GL_CULL_FACE
</code>
36 </td><td align=
"left">
37 <a href=
"glCullFace.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glCullFace
</span></span></a>
38 </td></tr><tr><td align=
"left">
39 <code class=
"constant">GL_DEPTH_CLAMP
</code>
40 </td><td align=
"left">
41 <a href=
"glEnable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnable
</span></span></a>
42 </td></tr><tr><td align=
"left">
43 <code class=
"constant">GL_DEPTH_TEST
</code>
44 </td><td align=
"left">
45 <a href=
"glDepthFunc.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDepthFunc
</span></span></a>,
<a href=
"glDepthRange.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDepthRange
</span></span></a>
46 </td></tr><tr><td align=
"left">
47 <code class=
"constant">GL_DITHER
</code>
48 </td><td align=
"left">
49 <a href=
"glEnable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnable
</span></span></a>
50 </td></tr><tr><td align=
"left">
51 <code class=
"constant">GL_FRAMEBUFFER_SRGB
</code>
52 </td><td align=
"left">
53 <a href=
"glEnable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnable
</span></span></a>
54 </td></tr><tr><td align=
"left">
55 <code class=
"constant">GL_LINE_SMOOTH
</code>
56 </td><td align=
"left">
57 <a href=
"glLineWidth.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glLineWidth
</span></span></a>
58 </td></tr><tr><td align=
"left">
59 <code class=
"constant">GL_MULTISAMPLE
</code>
60 </td><td align=
"left">
61 <a href=
"glSampleCoverage.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glSampleCoverage
</span></span></a>
62 </td></tr><tr><td align=
"left">
63 <code class=
"constant">GL_POLYGON_SMOOTH
</code>
64 </td><td align=
"left">
65 <a href=
"glPolygonMode.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPolygonMode
</span></span></a>
66 </td></tr><tr><td align=
"left">
67 <code class=
"constant">GL_POLYGON_OFFSET_FILL
</code>
68 </td><td align=
"left">
69 <a href=
"glPolygonOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPolygonOffset
</span></span></a>
70 </td></tr><tr><td align=
"left">
71 <code class=
"constant">GL_POLYGON_OFFSET_LINE
</code>
72 </td><td align=
"left">
73 <a href=
"glPolygonOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPolygonOffset
</span></span></a>
74 </td></tr><tr><td align=
"left">
75 <code class=
"constant">GL_POLYGON_OFFSET_POINT
</code>
76 </td><td align=
"left">
77 <a href=
"glPolygonOffset.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPolygonOffset
</span></span></a>
78 </td></tr><tr><td align=
"left">
79 <code class=
"constant">GL_PROGRAM_POINT_SIZE
</code>
80 </td><td align=
"left">
81 <a href=
"glEnable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnable
</span></span></a>
82 </td></tr><tr><td align=
"left">
83 <code class=
"constant">GL_PRIMITIVE_RESTART
</code>
84 </td><td align=
"left">
85 <a href=
"glEnable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnable
</span></span></a>,
<a href=
"glPrimitiveRestartIndex.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPrimitiveRestartIndex
</span></span></a>
86 </td></tr><tr><td align=
"left">
87 <code class=
"constant">GL_SAMPLE_ALPHA_TO_COVERAGE
</code>
88 </td><td align=
"left">
89 <a href=
"glSampleCoverage.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glSampleCoverage
</span></span></a>
90 </td></tr><tr><td align=
"left">
91 <code class=
"constant">GL_SAMPLE_ALPHA_TO_ONE
</code>
92 </td><td align=
"left">
93 <a href=
"glSampleCoverage.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glSampleCoverage
</span></span></a>
94 </td></tr><tr><td align=
"left">
95 <code class=
"constant">GL_SAMPLE_COVERAGE
</code>
96 </td><td align=
"left">
97 <a href=
"glSampleCoverage.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glSampleCoverage
</span></span></a>
98 </td></tr><tr><td align=
"left">
99 <code class=
"constant">GL_SAMPLE_MASK
</code>
100 </td><td align=
"left">
101 <a href=
"glEnable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnable
</span></span></a>
102 </td></tr><tr><td align=
"left">
103 <code class=
"constant">GL_SCISSOR_TEST
</code>
104 </td><td align=
"left">
105 <a href=
"glScissor.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glScissor
</span></span></a>
106 </td></tr><tr><td align=
"left">
107 <code class=
"constant">GL_STENCIL_TEST
</code>
108 </td><td align=
"left">
109 <a href=
"glStencilFunc.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glStencilFunc
</span></span></a>,
<a href=
"glStencilOp.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glStencilOp
</span></span></a>
110 </td></tr><tr><td align=
"left">
111 <code class=
"constant">GL_TEXTURE_CUBEMAP_SEAMLESS
</code>
112 </td><td align=
"left">
113 <a href=
"glEnable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnable
</span></span></a>
114 </td></tr></tbody></table></div><p>
115 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
116 If an error is generated,
117 <code class=
"function">glIsEnabled
</code> and
<code class=
"function">glIsEnabledi
</code> return
<code class=
"constant">GL_FALSE
</code>.
118 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
119 <code class=
"constant">GL_INVALID_ENUM
</code> is generated if
<em class=
"parameter"><code>cap
</code></em> is not an accepted value.
121 <code class=
"constant">GL_INVALID_VALUE
</code> is generated by
<code class=
"function">glIsEnabledi
</code> if
<em class=
"parameter"><code>index
</code></em> is outside the
122 valid range for the indexed state
<em class=
"parameter"><code>cap
</code></em>.
123 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
124 <a href=
"glEnable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnable
</span></span></a>,
125 <a href=
"glDisable.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDisable
</span></span></a>,
126 <a href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a>
127 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
128 Copyright
<span class=
"trademark"></span>©
1991-
2006
129 Silicon Graphics, Inc. Copyright
<span class=
"trademark"></span>©
2010-
2011
130 Khronos Group. This document is licensed under the SGI
131 Free Software B License. For details, see
132 <a href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
133 </p></div></div></body></html>