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4 | <?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" /><link rel="stylesheet" type="text/css" href="opengl-man.css" /><title>glGetMultisamplefv</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /></head><body><div class="refentry" title="glGetMultisamplefv"><a id="glGetMultisample"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>glGetMultisamplefv — retrieve the location of a sample</p></div><div class="refsynopsisdiv" title="C Specification"><h2>C Specification</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">void <b class="fsfunc">glGetMultisamplefv</b>(</code></td><td>GLenum <var class="pdparam">pname</var>, </td></tr><tr><td> </td><td>GLuint <var class="pdparam">index</var>, </td></tr><tr><td> </td><td>GLfloat *<var class="pdparam">val</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Parameters"><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> | |
5 | Specifies the sample parameter name. <em class="parameter"><code>pname</code></em> must be <code class="constant">GL_SAMPLE_POSITION</code>. | |
6 | </p></dd><dt><span class="term"><em class="parameter"><code>index</code></em></span></dt><dd><p> | |
7 | Specifies the index of the sample whose position to query. | |
8 | </p></dd><dt><span class="term"><em class="parameter"><code>val</code></em></span></dt><dd><p> | |
9 | Specifies the address of an array to receive the position of the sample. | |
10 | </p></dd></dl></div></div><div class="refsect1" title="Description"><a id="description"></a><h2>Description</h2><p> | |
11 | <code class="function">glGetMultisamplefv</code> queries the location of a given sample. <em class="parameter"><code>pname</code></em> | |
12 | specifies the sample parameter to retrieve and must be <code class="constant">GL_SAMPLE_POSITION</code>. <em class="parameter"><code>index</code></em> | |
13 | corresponds to the sample for which the location should be returned. The sample location is returned as two floating-point | |
14 | values in <em class="parameter"><code>val[0]</code></em> and <em class="parameter"><code>val[1]</code></em>, each between 0 and 1, corresponding to the <em class="parameter"><code>x</code></em> | |
15 | and <em class="parameter"><code>y</code></em> locations respectively in the GL pixel space of that sample. (0.5, 0.5) this corresponds to the | |
16 | pixel center. <em class="parameter"><code>index</code></em> must be between zero and the value of <code class="constant">GL_SAMPLES</code> - 1. | |
17 | </p><p> | |
18 | If the multisample mode does not have fixed sample locations, the returned values may only reflect the locations of samples | |
19 | within some pixels. | |
20 | </p></div><div class="refsect1" title="Errors"><a id="errors"></a><h2>Errors</h2><p> | |
21 | <code class="constant">GL_INVALID_ENUM</code> is generated if <em class="parameter"><code>pname</code></em> is not one <code class="constant">GL_SAMPLE_POSITION</code>. | |
22 | </p><p> | |
23 | <code class="constant">GL_INVALID_VALUE</code> is generated if <em class="parameter"><code>index</code></em> is greater than or equal to the value of | |
24 | <code class="constant">GL_SAMPLES</code>. | |
25 | </p></div><div class="refsect1" title="See Also"><a id="seealso"></a><h2>See Also</h2><p> | |
26 | <a class="citerefentry" href="glGenFramebuffers.xml"><span class="citerefentry"><span class="refentrytitle">glGenFramebuffers</span></span></a>, | |
27 | <a class="citerefentry" href="glBindFramebuffer.xml"><span class="citerefentry"><span class="refentrytitle">glBindFramebuffer</span></span></a> | |
28 | </p></div><div class="refsect1" title="Copyright"><a id="Copyright"></a><h2>Copyright</h2><p> | |
29 | Copyright <span class="trademark"></span>© 2010 Khronos Group. | |
30 | This material may be distributed subject to the terms and conditions set forth in | |
31 | the Open Publication License, v 1.0, 8 June 1999. | |
32 | <a class="ulink" href="http://opencontent.org/openpub/" target="_top">http://opencontent.org/openpub/</a>. | |
33 | </p></div></div></body></html> |