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150 lines
8.5 KiB
XML
150 lines
8.5 KiB
XML
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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="glGetActiveUniformBlock">
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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>glGetActiveUniformBlock</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetActiveUniformBlock</refname>
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<refpurpose>query information about an active uniform block</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>glGetActiveUniformBlockiv</function></funcdef>
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<paramdef>GLuint <parameter>program</parameter></paramdef>
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<paramdef>GLuint <parameter>uniformBlockIndex</parameter></paramdef>
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<paramdef>GLenum <parameter>pname</parameter></paramdef>
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<paramdef>GLint <parameter>params</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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Specifies the name of a program containing the uniform block.
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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>uniformBlockIndex</parameter></term>
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<listitem>
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<para>
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Specifies the index of the uniform block within <parameter>program</parameter>.
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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>pname</parameter></term>
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<listitem>
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<para>
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Specifies the name of the parameter 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>params</parameter></term>
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<listitem>
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<para>
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Specifies the address of a variable to receive the result of the query.
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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>glGetActiveUniformBlockiv</function> retrieves information about an active uniform block within <parameter>program</parameter>.
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</para>
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<para>
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<parameter>program</parameter> must be the name of a program object for which the command
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<citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry> must have been called in the past, although it is not required that
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<citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry> must have succeeded. The link could have failed because the number
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of active uniforms exceeded the limit.
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</para>
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<para>
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<parameter>uniformBlockIndex</parameter> is an active uniform block index of <parameter>program</parameter>, and must be less than the value
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of <constant>GL_ACTIVE_UNIFORM_BLOCKS</constant>.
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</para>
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<para>
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Upon success, the uniform block parameter(s) specified by <parameter>pname</parameter> are returned in <parameter>params</parameter>. If an error
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occurs, nothing will be written to <parameter>params</parameter>.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_UNIFORM_BLOCK_BINDING</constant>, then the index of the uniform buffer binding point
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last selected by the uniform block specified by <parameter>uniformBlockIndex</parameter> for <parameter>program</parameter> is returned. If
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no uniform block has been previously specified, zero is returned.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_UNIFORM_BLOCK_DATA_SIZE</constant>, then the implementation-dependent minimum total buffer
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object size, in basic machine units, required to hold all active uniforms in the uniform block identified by <parameter>uniformBlockIndex</parameter>
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is returned. It is neither guaranteed nor expected that a given implementation will arrange uniform values as tightly packed in a buffer
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object. The exception to this is the <emphasis>std140 uniform block layout</emphasis>, which guarantees specific packing behavior and does not
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require the application to query for offsets and strides. In this case the minimum size may still be queried, even though it is determined in
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advance based only on the uniform block declaration.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_UNIFORM_BLOCK_NAME_LENGTH</constant>, then the total length (including the nul terminator) of
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the name of the uniform block identified by <parameter>uniformBlockIndex</parameter> is returned.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS</constant>, then the number of active uniforms in the uniform
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block identified by <parameter>uniformBlockIndex</parameter> is returned.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_UNIFORM_BLOCK_ACTIVE_UNIFORM_INDICES</constant>, then a list of the active uniform indices
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for the uniform block identified by <parameter>uniformBlockIndex</parameter> is returned. The number of elements that will be written to
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<parameter>params</parameter> is the value of <constant>GL_UNIFORM_BLOCK_ACTIVE_UNIFORMS</constant> for <parameter>uniformBlockIndex</parameter>.
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</para>
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<para>
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If <parameter>pname</parameter> is <constant>GL_UNIFORM_BLOCK_REFERENCED_BY_VERTEX_SHADER</constant>, <constant>GL_UNIFORM_BLOCK_REFERENCED_BY_GEOMETRY_SHADER</constant>,
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or <constant>GL_UNIFORM_BLOCK_REFERENCED_BY_FRAGMENT_SHADER</constant>, then a boolean value indicating whether the uniform block identified by
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<parameter>uniformBlockIndex</parameter> is referenced by the vertex, geometry, or fragment programming stages of program, respectively, is returned.
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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>uniformBlockIndex</parameter> is greater than or equal to the value
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of <constant>GL_ACTIVE_UNIFORM_BLOCKS</constant> or is not the index of an active uniform block in <parameter>program</parameter>.
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</para>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>pname</parameter> is not one of the accepted tokens.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if <parameter>program</parameter> is not the name of a program object for which
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<citerefentry><refentrytitle>glLinkProgram</refentrytitle></citerefentry> has been called in the past.
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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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<function>glGetActiveUniformBlockiv</function> is available only if the GL version is 3.1 or greater.
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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>glGetActiveUniformBlockName</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetUniformBlockIndex</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glLinkProgram</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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