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<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glClearBufferData">
<info>
<copyright>
<year>2011-2014</year>
<holder>Khronos Group</holder>
</copyright>
</info>
<refmeta>
<refentrytitle>glClearBufferData</refentrytitle>
<manvolnum>3G</manvolnum>
</refmeta>
<refnamediv>
<refname>glClearBufferData</refname>
<refname>glClearNamedBufferData</refname>
<refpurpose>fill a buffer object's data store with a fixed value</refpurpose>
</refnamediv>
<refsynopsisdiv><title>C Specification</title>
<funcsynopsis>
<funcprototype>
<funcdef>void <function>glClearBufferData</function></funcdef>
<paramdef>GLenum <parameter>target</parameter></paramdef>
<paramdef>GLenum <parameter>internalformat</parameter></paramdef>
<paramdef>GLenum <parameter>format</parameter></paramdef>
<paramdef>GLenum <parameter>type</parameter></paramdef>
<paramdef>const void * <parameter>data</parameter></paramdef>
</funcprototype>
<funcprototype>
<funcdef>void <function>glClearNamedBufferData</function></funcdef>
<paramdef>GLuint <parameter>buffer</parameter></paramdef>
<paramdef>GLenum <parameter>internalformat</parameter></paramdef>
<paramdef>GLenum <parameter>format</parameter></paramdef>
<paramdef>GLenum <parameter>type</parameter></paramdef>
<paramdef>const void *<parameter>data</parameter></paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 xml:id="parameters"><title>Parameters</title>
<variablelist>
<varlistentry>
<term><parameter>target</parameter></term>
<listitem>
<para>
Specifies the target to which the buffer object is bound
for <function>glClearBufferData</function>, which must
must be one of the buffer binding targets in the
following table:
</para>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="bufferbindings.xml"/>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>buffer</parameter></term>
<listitem>
<para>
Specifies the name of the buffer object for
<function>glClearNamedBufferData</function>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>internalformat</parameter></term>
<listitem>
<para>
The internal format with which the data will be stored
in the buffer object.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>format</parameter></term>
<listitem>
<para>
The format of the data in memory addressed by
<parameter>data</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>type</parameter></term>
<listitem>
<para>
The type of the data in memory addressed by
<parameter>data</parameter>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>data</parameter></term>
<listitem>
<para>
The address of a memory location storing the data to be
replicated into the buffer's data store.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 xml:id="description"><title>Description</title>
<para>
<function>glClearBufferData</function> and
<function>glClearNamedBufferData</function> fill the entirety of
a buffer object's data store with data from client memory.
</para>
<para>
Data, initially supplied in a format specified by
<parameter>format</parameter> in data type
<parameter>type</parameter> is read from the memory address
given by <parameter>data</parameter> and converted into the
internal representation given by
<parameter>internalformat</parameter>, which must be one of the
following sized internal formats:
</para>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="texboformattable.xml"/>
<para>
This converted data is then replicated throughout the buffer
object's data store. If <parameter>data</parameter> is NULL,
then the buffer's data store is filled with zeros.
</para>
</refsect1>
<refsect1 xml:id="errors"><title>Errors</title>
<para>
<constant>GL_INVALID_ENUM</constant> is generated by
<function>glClearBufferData</function> if
<parameter>target</parameter> is not one of the generic buffer
binding targets.
</para>
<para>
<constant>GL_INVALID_VALUE</constant> is generated by
<function>glClearBufferData</function> if no buffer is bound
<parameter>target</parameter>.
</para>
<para>
<constant>GL_INVALID_OPERATION</constant> is generated by
<function>glClearNamedBufferData</function> if
<parameter>buffer</parameter> is not the name of an existing
buffer object.
</para>
<para>
<constant>GL_INVALID_ENUM</constant> is generated if
<parameter>internalformat</parameter> is not one of the valid
sized internal formats listed in the table above.
</para>
<para>
<constant>GL_INVALID_OPERATION</constant> is generated if any
part of the specified range of the buffer object is mapped with
<citerefentry><refentrytitle>glMapBufferRange</refentrytitle></citerefentry>
or
<citerefentry><refentrytitle>glMapBuffer</refentrytitle></citerefentry>,
unless it was mapped with the
<constant>GL_MAP_PERSISTENT_BIT</constant> bit set in the
<function>glMapBufferRange</function>
<parameter>access</parameter> flags.
</para>
<para>
<constant>GL_INVALID_VALUE</constant> is generated if
<parameter>format</parameter> is not a valid format, or
<parameter>type</parameter> is not a valid type.
</para>
</refsect1>
<refsect1 xml:id="versions"><title>Version Support</title>
<informaltable>
<tgroup cols="13" align="left">
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apifunchead.xml" xpointer="xpointer(/*/*)"/>
<tbody>
<row>
<entry><function>glClearBufferData</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='43']/*)"/>
</row>
<row>
<entry><function>glClearNamedBufferData</function></entry>
<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="apiversion.xml" xpointer="xpointer(/*/*[@role='45']/*)"/>
</row>
</tbody>
</tgroup>
</informaltable>
</refsect1>
<refsect1 xml:id="seealso"><title>See Also</title>
<para>
<citerefentry><refentrytitle>glClearBufferSubData</refentrytitle></citerefentry>.
</para>
</refsect1>
<refsect1 xml:id="Copyright"><title>Copyright</title>
<para>
Copyright <trademark class="copyright"/> 2011-2014 Khronos Group.
This material may be distributed subject to the terms and conditions set forth in
the Open Publication License, v 1.0, 8 June 1999.
<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
</para>
</refsect1>
</refentry>
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