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108 lines
5.1 KiB
XML
108 lines
5.1 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="glGetShaderPrecisionFormat">
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<refentryinfo>
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<copyright>
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<year>2010-2013</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>glGetShaderPrecisionFormat</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetShaderPrecisionFormat</refname>
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<refpurpose>retrieve the range and precision for numeric formats supported by the shader compiler</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>glGetShaderPrecisionFormat</function></funcdef>
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<paramdef>GLenum <parameter>shaderType</parameter></paramdef>
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<paramdef>GLenum <parameter>precisionType</parameter></paramdef>
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<paramdef>GLint *<parameter>range</parameter></paramdef>
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<paramdef>GLint *<parameter>precision</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>shaderType</parameter></term>
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<listitem>
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<para>
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Specifies the type of shader whose precision to query. <parameter>shaderType</parameter>
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must be <constant>GL_VERTEX_SHADER</constant> or <constant>GL_FRAGMENT_SHADER</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>precisionType</parameter></term>
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<listitem>
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<para>
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Specifies the numeric format whose precision and range 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>range</parameter></term>
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<listitem>
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<para>
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Specifies the address of array of two integers into which encodings of the implementation's
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numeric range are returned.
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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>precision</parameter></term>
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<listitem>
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<para>
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Specifies the address of an integer into which the numeric precision of the implementation
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is written.
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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>glGetShaderPrecisionFormat</function> retrieves the numeric range and precision for
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the implementation's representation of quantities in different numeric formats in specified
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shader type. <parameter>shaderType</parameter> specifies the type of shader for which the numeric
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precision and range is to be retrieved and must be one of <constant>GL_VERTEX_SHADER</constant>
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or <constant>GL_FRAGMENT_SHADER</constant>. <parameter>precisionType</parameter> specifies the
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numeric format to query and must be one of <constant>GL_LOW_FLOAT</constant>, <constant>GL_MEDIUM_FLOAT</constant>
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<constant>GL_HIGH_FLOAT</constant>, <constant>GL_LOW_INT</constant>, <constant>GL_MEDIUM_INT</constant>,
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or <constant>GL_HIGH_INT</constant>.
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</para>
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<para>
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<parameter>range</parameter> points to an array of two integers into which the format's numeric range
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will be returned. If min and max are the smallest values representable in the format, then the values
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returned are defined to be: <parameter>range</parameter>[0] = floor(log2(|min|)) and
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<parameter>range</parameter>[1] = floor(log2(|max|)).
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</para>
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<para>
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<parameter>precision</parameter> specifies the address of an integer into which will be written
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the log2 value of the number of bits of precision of the format. If the smallest representable
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value greater than 1 is 1 + <emphasis>eps</emphasis>, then the integer addressed by <parameter>precision</parameter>
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will contain floor(-log2(eps)).
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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>shaderType</parameter> or
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<parameter>precisionType</parameter> is not an accepted value.
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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> 2010-2013 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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