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renderer=
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"Content-Type" content=
"text/html; charset=UTF-8" /><title>glPointParameter
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.73.2" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"glPointParameter"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>glPointParameter — specify point parameters
</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">glPointParameterf
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">pname
</var>,
</td></tr><tr><td> </td><td>GLfloat
</td><td><var class=
"pdparam">param
</var><code>)
</code>;
</td></tr></table></div><p></p><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">void
<b class=
"fsfunc">glPointParameteri
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">pname
</var>,
</td></tr><tr><td> </td><td>GLint
</td><td><var class=
"pdparam">param
</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>pname
</code></em></span></dt><dd><p>
4 Specifies a single-valued point parameter.
5 <code class=
"constant">GL_POINT_SIZE_MIN
</code>,
6 <code class=
"constant">GL_POINT_SIZE_MAX
</code>,
7 <code class=
"constant">GL_POINT_FADE_THRESHOLD_SIZE
</code>, and
8 <code class=
"constant">GL_POINT_SPRITE_COORD_ORIGIN
</code>
10 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>param
</code></em></span></dt><dd><p>
11 Specifies the value that
<em class=
"parameter"><code>pname
</code></em> will be set to.
12 </p></dd></dl></div></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">glPointParameterfv
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">pname
</var>,
</td></tr><tr><td> </td><td>const GLfloat *
</td><td><var class=
"pdparam">params
</var><code>)
</code>;
</td></tr></table></div><p></p><div class=
"funcsynopsis"><table border=
"0" summary=
"Function synopsis" cellspacing=
"0" cellpadding=
"0"><tr><td><code class=
"funcdef">void
<b class=
"fsfunc">glPointParameteriv
</b>(
</code></td><td>GLenum
</td><td><var class=
"pdparam">pname
</var>,
</td></tr><tr><td> </td><td>const GLint *
</td><td><var class=
"pdparam">params
</var><code>)
</code>;
</td></tr></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"parameters2"></a><h2>Parameters
</h2><div class=
"variablelist"><dl><dt><span class=
"term"><em class=
"parameter"><code>pname
</code></em></span></dt><dd><p>
13 Specifies a point parameter.
14 <code class=
"constant">GL_POINT_SIZE_MIN
</code>,
15 <code class=
"constant">GL_POINT_SIZE_MAX
</code>,
16 <code class=
"constant">GL_POINT_DISTANCE_ATTENUATION
</code>,
17 <code class=
"constant">GL_POINT_FADE_THRESHOLD_SIZE
</code>, and
18 <code class=
"constant">GL_POINT_SPRITE_COORD_ORIGIN
</code>
20 </p></dd><dt><span class=
"term"><em class=
"parameter"><code>params
</code></em></span></dt><dd><p>
21 Specifies the value or values to be assigned to
<em class=
"parameter"><code>pname
</code></em>.
22 <code class=
"constant">GL_POINT_DISTANCE_ATTENUATION
</code> requires an array of three values.
23 All other parameters accept an array containing only a single value.
24 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
25 The following values are accepted for
<em class=
"parameter"><code>pname
</code></em>:
26 </p><div class=
"variablelist"><dl><dt><span class=
"term"><code class=
"constant">GL_POINT_SIZE_MIN
</code></span></dt><dd><p>
28 <em class=
"parameter"><code>params
</code></em> is a single floating-point value that specifies the minimum point size. The default value is
0.0.
29 </p></dd><dt><span class=
"term"><code class=
"constant">GL_POINT_SIZE_MAX
</code></span></dt><dd><p>
31 <em class=
"parameter"><code>params
</code></em> is a single floating-point value that specifies the maximum point size. The default value is
1.0.
32 </p></dd><dt><span class=
"term"><code class=
"constant">GL_POINT_FADE_THRESHOLD_SIZE
</code></span></dt><dd><p>
34 <em class=
"parameter"><code>params
</code></em> is a single floating-point value that specifies the threshold value
35 to which point sizes are clamped if they exceed the specified value. The
37 </p></dd><dt><span class=
"term"><code class=
"constant">GL_POINT_DISTANCE_ATTENUATION
</code></span></dt><dd><p>
39 <em class=
"parameter"><code>params
</code></em> is an array of three floating-point values that specify the
40 coefficients used for scaling the computed point size. The default values
42 <mml:math xmlns:
mml=
"http://www.w3.org/1998/Math/MathML" overflow=
"scroll">
44 <mml:mfenced open=
"(" close=
")">
50 </p></dd><dt><span class=
"term"><code class=
"constant">GL_POINT_SPRITE_COORD_ORIGIN
</code></span></dt><dd><p>
52 <em class=
"parameter"><code>params
</code></em> is a single enum specifying the point sprite texture coordinate origin, either
<code class=
"constant">GL_LOWER_LEFT
</code> or
<code class=
"constant">GL_UPPER_LEFT
</code>.
53 The default value is
<code class=
"constant">GL_UPPER_LEFT
</code>.
54 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"notes"></a><h2>Notes
</h2><p>
55 <code class=
"function">glPointParameter
</code> is available only if the GL version is
1.4 or greater.
57 <code class=
"constant">GL_POINT_SPRITE_COORD_ORIGIN
</code> is available only if the GL version is
2.0 or greater.
58 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"errors"></a><h2>Errors
</h2><p>
59 <code class=
"constant">GL_INVALID_VALUE
</code> is generated If the value specified for
60 <code class=
"constant">GL_POINT_SIZE_MIN
</code>,
<code class=
"constant">GL_POINT_SIZE_MAX
</code>, or
61 <code class=
"constant">GL_POINT_FADE_THRESHOLD_SIZE
</code> is less than zero.
63 <code class=
"constant">GL_INVALID_ENUM
</code> is generated If the value specified for
64 <code class=
"constant">GL_POINT_SPRITE_COORD_ORIGIN
</code> is not
<code class=
"constant">GL_LOWER_LEFT
</code> or
<code class=
"constant">GL_UPPER_LEFT
</code>.
66 If the value for
<code class=
"constant">GL_POINT_SIZE_MIN
</code> is greater than
67 <code class=
"constant">GL_POINT_SIZE_MAX
</code>, the point size after clamping is undefined, but no
70 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"associatedgets"></a><h2>Associated Gets
</h2><p>
71 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_POINT_SIZE_MIN
</code>
73 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_POINT_SIZE_MAX
</code>
75 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_POINT_FADE_THRESHOLD_SIZE
</code>
77 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_POINT_DISTANCE_ATTENUATION
</code>
79 <a class=
"citerefentry" href=
"glGet.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glGet
</span></span></a> with argument
<code class=
"constant">GL_POINT_SPRITE_COORD_ORIGIN
</code>
80 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
81 <a class=
"citerefentry" href=
"glPointSize.xml"><span class=
"citerefentry"><span class=
"refentrytitle">glPointSize
</span></span></a>
82 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
83 Copyright
<span class=
"trademark"></span>©
1991-
2006
84 Silicon Graphics, Inc. This document is licensed under the SGI
85 Free Software B License. For details, see
86 <a class=
"ulink" href=
"http://oss.sgi.com/projects/FreeB/" target=
"_top">http://oss.sgi.com/projects/FreeB/
</a>.
87 </p></div></div></body></html>