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94 lines
4.4 KiB
XML
94 lines
4.4 KiB
XML
<?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="glMinSampleShading">
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<refentryinfo>
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<copyright>
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<year>2011-2013</year>
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<holder>Khronos Group.</holder>
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</copyright>
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</refentryinfo>
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<refmeta>
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<refentrytitle>glMinSampleShading</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glMinSampleShading</refname>
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<refpurpose>specifies minimum rate at which sample shaing takes place</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>glMinSampleShading</function></funcdef>
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<paramdef>GLfloat <parameter>value</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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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>value</parameter></term>
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<listitem>
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<para>
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Specifies the rate at which samples are shaded within each covered pixel.
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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>glMinSampleShading</function> specifies the rate at which samples are shaded within
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a covered pixel. Sample-rate shading is enabled by calling <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>
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with the parameter <constant>GL_SAMPLE_SHADING</constant>. If <constant>GL_MULTISAMPLE</constant>
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or <constant>GL_SAMPLE_SHADING</constant> is disabled, sample shading has no effect.
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Otherwise, an implementation must provide at least as many unique color values for
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each covered fragment as specified by <parameter>value</parameter> times <parameter>samples</parameter> where
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<parameter>samples</parameter> is the value of <constant>GL_SAMPLES</constant> for the current
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framebuffer. At least 1 sample for each covered fragment is generated.
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</para>
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<para>
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A <parameter>value</parameter> of 1.0 indicates that each sample in the framebuffer should be
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indpendently shaded. A <parameter>value</parameter> of 0.0 effectively allows the GL to ignore
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sample rate shading. Any value between 0.0 and 1.0 allows the GL to shade only a subset
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of the total samples within each covered fragment. Which samples are shaded and the algorithm
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used to select that subset of the fragment's samples is implementation dependent.
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</para>
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</refsect1>
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<refsect1 id="notes"><title>Notes</title>
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<para>
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The type of the <parameter>value</parameter> parameter was
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changed from GLclampf to GLfloat. This change is transparent
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to user code and is described in detail on the
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<citerefentry><refentrytitle>removedTypes</refentrytitle></citerefentry>
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page.
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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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None.
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</para>
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</refsect1>
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<refsect1 id="associatedgets"><title>Associated Gets</title>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_MIN_SAMPLE_SHADING</constant>.
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</para>
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<para>
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<citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <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>removedTypes</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> 2011-2013 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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