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156 lines
8 KiB
XML
156 lines
8 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="glBindFragDataLocationIndexed">
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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>glBindFragDataLocationIndexed</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glBindFragDataLocationIndexed</refname>
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<refpurpose>bind a user-defined varying out variable to a fragment shader color number and index</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>glBindFragDataLocationIndexed</function></funcdef>
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<paramdef>GLuint <parameter>program</parameter></paramdef>
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<paramdef>GLuint <parameter>colorNumber</parameter></paramdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const char *<parameter>name</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>program</parameter></term>
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<listitem>
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<para>
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The name of the program containing varying out variable whose binding to modify
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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>colorNumber</parameter></term>
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<listitem>
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<para>
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The color number to bind the user-defined varying out variable to
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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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The index of the color input to bind the user-defined varying out variable to
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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>name</parameter></term>
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<listitem>
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<para>
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The name of the user-defined varying out variable whose binding to modify
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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>glBindFragDataLocationIndexed</function> specifies that the varying out variable <parameter>name</parameter> in
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<parameter>program</parameter> should be bound to fragment color <parameter>colorNumber</parameter> when the program is next
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linked. <parameter>index</parameter> may be zero or one to specify that the color be used as either the first or second color
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input to the blend equation, respectively.
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</para>
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<para>
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The bindings specified by <function>glBindFragDataLocationIndexed</function> have no effect until <parameter>program</parameter>
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is next linked. Bindings may be specified at any time after <parameter>program</parameter> has been created. Specifically,
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they may be specified before shader objects are attached to the program. Therefore, any name may be specified in <parameter>name</parameter>,
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including a name that is never used as a varying out variable in any fragment shader object. Names beginning with <constant>gl_</constant> are
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reserved by the GL.
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</para>
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<para>
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If <parameter>name</parameter> was bound previously, its assigned binding is replaced with <parameter>colorNumber</parameter> and
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<parameter>index</parameter>. <parameter>name</parameter> must be a null-terminated string. <parameter>index</parameter> must be less than or equal to one,
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and <parameter>colorNumber</parameter> must be less than the value of <constant>GL_MAX_DRAW_BUFFERS</constant> if <parameter>index</parameter>
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is zero, and less than the value of <constant>GL_MAX_DUAL_SOURCE_DRAW_BUFFERS</constant> if index is greater than or equal to one.
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</para>
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<para>
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In addition to the errors generated by <function>glBindFragDataLocationIndexed</function>, the
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program <parameter>program</parameter> will fail to link if:
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<itemizedlist>
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<listitem>
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<para>
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The number of active outputs is greater than the value <constant>GL_MAX_DRAW_BUFFERS</constant>.
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</para>
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</listitem>
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<listitem>
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<para>
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More than one varying out variable is bound to the same color number.
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</para>
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</listitem>
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</itemizedlist>
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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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Varying out varyings may have locations assigned explicitly in the shader text using a <code>location</code>
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layout qualifier. If a shader statically assigns a location to a varying out variable in the shader text,
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that location is used and any location assigned with <function>glBindFragDataLocation</function> is ignored.
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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_VALUE</constant> is generated if <parameter>colorNumber</parameter> is greater than or equal to <constant>GL_MAX_DRAW_BUFFERS</constant>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>colorNumber</parameter> is greater than or equal to <constant>GL_MAX_DUAL_SOURCE_DRAW_BUFFERS</constant>
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and <parameter>index</parameter> is greater than or equal to one.
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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 one.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>name</parameter> starts with the reserved <constant>gl_</constant> prefix.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <function>program</function> is not the name of a program object.
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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>glGetFragDataLocation</refentrytitle></citerefentry> with a valid program object
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and the the name of a user-defined varying out variable
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</para>
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<para>
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<citerefentry><refentrytitle>glGetFragDataIndex</refentrytitle></citerefentry> with a valid program object
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and the the name of a user-defined varying out variable
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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>glCreateProgram</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry>
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<citerefentry><refentrytitle>glGetFragDataLocation</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetFragDataIndex</refentrytitle></citerefentry>
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<citerefentry><refentrytitle>glBindFragDataLocation</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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