2013-10-10 23:58:54 +00:00
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glGetMultisample">
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<refmeta>
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<refmetainfo>
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<copyright>
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<year>2010</year>
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<holder>Khronos Group</holder>
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</copyright>
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</refmetainfo>
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<refentrytitle>glGetMultisamplefv</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetMultisamplefv</refname>
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<refpurpose>retrieve the location of a sample</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glGetMultisamplefv</function></funcdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLfloat *<parameter>val</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>pname</parameter></term>
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<listitem>
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<para>
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Specifies the sample parameter name. <parameter>pname</parameter> must be <constant>GL_SAMPLE_POSITION</constant>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>index</parameter></term>
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<listitem>
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<para>
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Specifies the index of the sample whose position to query.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>val</parameter></term>
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<listitem>
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<para>
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Specifies the address of an array to receive the position of the sample.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="description"><title>Description</title>
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<para>
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<function>glGetMultisamplefv</function> queries the location of a given sample. <parameter>pname</parameter>
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specifies the sample parameter to retrieve and must be <constant>GL_SAMPLE_POSITION</constant>. <parameter>index</parameter>
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corresponds to the sample for which the location should be returned. The sample location is returned as two floating-point
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values in <parameter>val[0]</parameter> and <parameter>val[1]</parameter>, each between 0 and 1, corresponding to the <parameter>x</parameter>
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and <parameter>y</parameter> locations respectively in the GL pixel space of that sample. (0.5, 0.5) this corresponds to the
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pixel center. <parameter>index</parameter> must be between zero and the value of <constant>GL_SAMPLES</constant> - 1.
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</para>
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<para>
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If the multisample mode does not have fixed sample locations, the returned values may only reflect the locations of samples
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within some pixels.
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</para>
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</refsect1>
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<refsect1 id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter> is not one <constant>GL_SAMPLE_POSITION</constant>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>index</parameter> is greater than or equal to the value of
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<constant>GL_SAMPLES</constant>.
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</para>
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</refsect1>
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<refsect1 id="seealso"><title>See Also</title>
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<para>
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<citerefentry><refentrytitle>glGenFramebuffers</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glBindFramebuffer</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"></trademark> 2010 Khronos Group.
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This material may be distributed subject to the terms and conditions set forth in
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the Open Publication License, v 1.0, 8 June 1999.
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<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
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</para>
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</refsect1>
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</refentry>
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