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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>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> | |
9 | are accepted. | |
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> | |
19 | are accepted. | |
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> | |
27 | </p><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> | |
30 | </p><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> | |
33 | </p><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 | |
36 | default value is 1.0. | |
37 | </p></dd><dt><span class="term"><code class="constant">GL_POINT_DISTANCE_ATTENUATION</code></span></dt><dd><p> | |
38 | </p><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 | |
41 | are | |
42 | <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> | |
43 | ||
44 | <mml:mfenced open="(" close=")"> | |
45 | <mml:mn>1</mml:mn> | |
46 | <mml:mn>0</mml:mn> | |
47 | <mml:mn>0</mml:mn> | |
48 | </mml:mfenced> | |
49 | </mml:math>. | |
50 | </p></dd><dt><span class="term"><code class="constant">GL_POINT_SPRITE_COORD_ORIGIN</code></span></dt><dd><p> | |
51 | </p><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. | |
56 | </p><p> | |
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. | |
62 | </p><p> | |
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>. | |
65 | </p><p> | |
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 | |
68 | error is generated. | |
69 | </p><p> | |
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> | |
72 | </p><p> | |
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> | |
74 | </p><p> | |
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> | |
76 | </p><p> | |
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> | |
78 | </p><p> | |
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> |