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3 <?xml-stylesheet type=
"text/xsl" href=
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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>glFogCoordPointer
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glFogCoordPointer"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glFogCoordPointer — define an array of fog coordinates
</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">glFogCoordPointer
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">type
</var>,
</td></tr><tr><td> </td><td>GLsizei
</td><td><var class=
"pdparam">stride
</var>,
</td></tr><tr><td> </td><td>GLvoid *
</td><td><var class=
"pdparam">pointer
</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>type
</code></em></span></dt><dd><p>
4 Specifies the data type of each fog coordinate.
6 <code class=
"constant">GL_FLOAT
</code>,
7 or
<code class=
"constant">GL_DOUBLE
</code>
8 are accepted. The initial value is
<code class=
"constant">GL_FLOAT
</code>.
9 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>stride
</code></em></span></dt><dd><p>
10 Specifies the byte offset between consecutive fog coordinates.
11 If
<em class=
"parameter"><code>stride
</code></em> is
0, the array elements are understood
12 to be tightly packed. The initial value is
0.
13 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>pointer
</code></em></span></dt><dd><p>
14 Specifies a pointer to the first coordinate of the first fog coordinate in the
15 array. The initial value is
0.
16 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
17 <code class=
"function">glFogCoordPointer
</code> specifies the location and data format of an array of fog coordinates
18 to use when rendering.
<em class=
"parameter"><code>type
</code></em> specifies the data type of each fog
19 coordinate, and
<em class=
"parameter"><code>stride
</code></em> specifies the byte stride from one fog coordinate to
20 the next, allowing vertices and attributes to be packed into a single array
21 or stored in separate arrays.
23 If a non-zero named buffer object is bound to the
<code class=
"constant">GL_ARRAY_BUFFER
</code> target
24 (see
<a class=
"citerefentry" href=
"glBindBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBindBuffer
</span></span></a>) while a fog coordinate array is
25 specified,
<em class=
"parameter"><code>pointer
</code></em> is treated as a byte offset into the buffer object's data store.
26 Also, the buffer object binding (
<code class=
"constant">GL_ARRAY_BUFFER_BINDING
</code>) is saved as fog coordinate vertex array
27 client-side state (
<code class=
"constant">GL_FOG_COORD_ARRAY_BUFFER_BINDING
</code>).
29 When a fog coordinate array is specified,
30 <em class=
"parameter"><code>type
</code></em>,
<em class=
"parameter"><code>stride
</code></em>, and
<em class=
"parameter"><code>pointer
</code></em> are saved as client-side
31 state, in addition to the current vertex array buffer object binding.
33 To enable and disable the fog coordinate array, call
34 <a class=
"citerefentry" href=
"glEnableClientState.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnableClientState
</span></span></a> and
<a class=
"citerefentry" href=
"glDisableClientState.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDisableClientState
</span></span></a> with the argument
35 <code class=
"constant">GL_FOG_COORD_ARRAY
</code>. If
36 enabled, the fog coordinate array is used
37 when
<a class=
"citerefentry" href=
"glDrawArrays.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawArrays
</span></span></a>,
<a class=
"citerefentry" href=
"glMultiDrawArrays.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glMultiDrawArrays
</span></span></a>,
<a class=
"citerefentry" href=
"glDrawElements.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawElements
</span></span></a>,
38 <a class=
"citerefentry" href=
"glMultiDrawElements.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glMultiDrawElements
</span></span></a>,
<a class=
"citerefentry" href=
"glDrawRangeElements.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawRangeElements
</span></span></a>, or
39 <a class=
"citerefentry" href=
"glArrayElement.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glArrayElement
</span></span></a> is called.
40 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
41 <code class=
"function">glFogCoordPointer
</code> is available only if the GL version is
1.4 or greater.
43 Fog coordinates are not supported for interleaved vertex array formats
44 (see
<a class=
"citerefentry" href=
"glInterleavedArrays.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glInterleavedArrays
</span></span></a>).
46 The fog coordinate array is initially disabled and isn't accessed when
47 <a class=
"citerefentry" href=
"glArrayElement.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glArrayElement
</span></span></a>,
<a class=
"citerefentry" href=
"glDrawElements.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawElements
</span></span></a>,
<a class=
"citerefentry" href=
"glDrawRangeElements.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawRangeElements
</span></span></a>,
48 <a class=
"citerefentry" href=
"glDrawArrays.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawArrays
</span></span></a>,
<a class=
"citerefentry" href=
"glMultiDrawArrays.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glMultiDrawArrays
</span></span></a>, or
<a class=
"citerefentry" href=
"glMultiDrawElements.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glMultiDrawElements
</span></span></a>
51 Execution of
<code class=
"function">glFogCoordPointer
</code> is not allowed between the execution of
52 <a class=
"citerefentry" href=
"glBegin.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBegin
</span></span></a> and the corresponding execution of
<a class=
"citerefentry" href=
"glEnd.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnd
</span></span></a>,
53 but an error may or may not be generated. If no error is generated,
54 the operation is undefined.
56 <code class=
"function">glFogCoordPointer
</code> is typically implemented on the client side with no protocol.
58 Fog coordinate array parameters are client-side state and are
59 therefore not saved or restored by
<a class=
"citerefentry" href=
"glPushAttrib.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPushAttrib
</span></span></a> and
<a class=
"citerefentry" href=
"glPopAttrib.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPopAttrib
</span></span></a>.
60 Use
<a class=
"citerefentry" href=
"glPushClientAttrib.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPushClientAttrib
</span></span></a> and
61 <a class=
"citerefentry" href=
"glPopClientAttrib.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPopClientAttrib
</span></span></a> instead.
62 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
63 <code class=
"constant">GL_INVALID_ENUM
</code> is generated if
<em class=
"parameter"><code>type
</code></em> is not either
<code class=
"constant">GL_FLOAT
</code>
64 or
<code class=
"constant">GL_DOUBLE
</code>.
66 <code class=
"constant">GL_INVALID_VALUE
</code> is generated if
<em class=
"parameter"><code>stride
</code></em> is negative.
67 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"associatedgets"></a><h2>Associated Gets
</h2><p>
68 <a class=
"citerefentry" href=
"glIsEnabled.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glIsEnabled
</span></span></a> with argument
<code class=
"constant">GL_FOG_COORD_ARRAY
</code>
70 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_FOG_COORD_ARRAY_STRIDE
</code>
72 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_FOG_COORD_ARRAY_TYPE
</code>
74 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_FOG_COORD_ARRAY_BUFFER_BINDING
</code>
76 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_ARRAY_BUFFER_BINDING
</code>
78 <a class=
"citerefentry" href=
"glGetPointerv.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGetPointerv
</span></span></a> with argument
<code class=
"constant">GL_FOG_COORD_ARRAY_POINTER
</code>
79 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
80 <a class=
"citerefentry" href=
"glArrayElement.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glArrayElement
</span></span></a>,
81 <a class=
"citerefentry" href=
"glBindBuffer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glBindBuffer
</span></span></a>,
82 <a class=
"citerefentry" href=
"glColorPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glColorPointer
</span></span></a>,
83 <a class=
"citerefentry" href=
"glDisableClientState.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDisableClientState
</span></span></a>,
84 <a class=
"citerefentry" href=
"glDrawArrays.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawArrays
</span></span></a>,
85 <a class=
"citerefentry" href=
"glDrawElements.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawElements
</span></span></a>,
86 <a class=
"citerefentry" href=
"glDrawRangeElements.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glDrawRangeElements
</span></span></a>,
87 <a class=
"citerefentry" href=
"glEdgeFlagPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEdgeFlagPointer
</span></span></a>,
88 <a class=
"citerefentry" href=
"glEnableClientState.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glEnableClientState
</span></span></a>,
89 <a class=
"citerefentry" href=
"glFogCoord.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glFogCoord
</span></span></a>,
90 <a class=
"citerefentry" href=
"glIndexPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glIndexPointer
</span></span></a>,
91 <a class=
"citerefentry" href=
"glInterleavedArrays.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glInterleavedArrays
</span></span></a>,
92 <a class=
"citerefentry" href=
"glMultiDrawArrays.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glMultiDrawArrays
</span></span></a>,
93 <a class=
"citerefentry" href=
"glMultiDrawElements.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glMultiDrawElements
</span></span></a>,
94 <a class=
"citerefentry" href=
"glNormalPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glNormalPointer
</span></span></a>,
95 <a class=
"citerefentry" href=
"glPopClientAttrib.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPopClientAttrib
</span></span></a>,
96 <a class=
"citerefentry" href=
"glPushClientAttrib.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPushClientAttrib
</span></span></a>,
97 <a class=
"citerefentry" href=
"glSecondaryColorPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glSecondaryColorPointer
</span></span></a>,
98 <a class=
"citerefentry" href=
"glTexCoordPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glTexCoordPointer
</span></span></a>,
99 <a class=
"citerefentry" href=
"glVertexAttribPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glVertexAttribPointer
</span></span></a>,
100 <a class=
"citerefentry" href=
"glVertexPointer.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glVertexPointer
</span></span></a>
101 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
102 Copyright
<span class=
"trademark"></span>©
1991-
2006
103 Silicon Graphics, Inc. This document is licensed under the SGI
104 Free Software B License. For details, see
105 <a class=
"ulink" href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
106 </p></div></div></body></html>