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144 lines
7.9 KiB
XML
144 lines
7.9 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="glCopyBufferSubData">
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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>glCopyBufferSubData</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glCopyBufferSubData</refname>
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<refpurpose>copy part of the data store of a buffer object to the data store of another buffer object</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>glCopyBufferSubData</function></funcdef>
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<paramdef>GLenum <parameter>readtarget</parameter></paramdef>
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<paramdef>GLenum <parameter>writetarget</parameter></paramdef>
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<paramdef>GLintptr <parameter>readoffset</parameter></paramdef>
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<paramdef>GLintptr <parameter>writeoffset</parameter></paramdef>
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<paramdef>GLsizeiptr <parameter>size</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<!-- eqn: ignoring delim $$ -->
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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>readtarget</parameter></term>
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<listitem>
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<para>
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Specifies the target from whose data store data should be read.
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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>writetarget</parameter></term>
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<listitem>
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<para>
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Specifies the target to whose data store data should be written.
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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>readoffset</parameter></term>
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<listitem>
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<para>
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Specifies the offset, in basic machine units, within the data store of <parameter>readtarget</parameter> from which data should be read.
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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>writeoffset</parameter></term>
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<listitem>
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<para>
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Specifies the offset, in basic machine units, within the data store of <parameter>writetarget</parameter> to which data should be written.
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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>size</parameter></term>
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<listitem>
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<para>
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Specifies the size, in basic machine units, of the data to be copied from <parameter>readtarget</parameter> to <parameter>writetarget</parameter>.
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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>glCopyBufferSubData</function> copies part of the data store attached to <parameter>readtarget</parameter> to the
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data store attached to <parameter>writetarget</parameter>. The number of basic machine units indicated by <parameter>size</parameter>
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is copied from the source, at offset <parameter>readoffset</parameter> to the destination at <parameter>writeoffset</parameter>,
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also in basic machine units.
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</para>
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<para>
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<parameter>readtarget</parameter> and <parameter>writetarget</parameter> must be <constant>GL_ARRAY_BUFFER</constant>,
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<constant>GL_COPY_READ_BUFFER</constant>, <constant>GL_COPY_WRITE_BUFFER</constant>, <constant>GL_ELEMENT_ARRAY_BUFFER</constant>,
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<constant>GL_PIXEL_PACK_BUFFER</constant>, <constant>GL_PIXEL_UNPACK_BUFFER</constant>, <constant>GL_TEXTURE_BUFFER</constant>,
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<constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant> or <constant>GL_UNIFORM_BUFFER</constant>. Any of these targets may be used,
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although the targets <constant>GL_COPY_READ_BUFFER</constant> and <constant>GL_COPY_WRITE_BUFFER</constant> are provided
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specifically to allow copies between buffers without disturbing other GL state.
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</para>
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<para>
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<parameter>readoffset</parameter>, <parameter>writeoffset</parameter> and <parameter>size</parameter> must all be greater than or equal to
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zero. Furthermore, <parameter>readoffset</parameter> + <parameter>size</parameter> must not exceeed the size of the buffer
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object bound to <parameter>readtarget</parameter>, and <parameter>readoffset</parameter> + <parameter>size</parameter> must not exceeed the
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size of the buffer bound to <parameter>writetarget</parameter>. If the same buffer object is bound to both <parameter>readtarget</parameter>
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and <parameter>writetarget</parameter>, then the ranges specified by <parameter>readoffset</parameter>, <parameter>writeoffset</parameter>
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and <parameter>size</parameter> must not overlap.
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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>glCopyBufferSubData</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="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if any of <parameter>readoffset</parameter>, <parameter>writeoffset</parameter>
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or <parameter>size</parameter> is negative, if <parameter>readoffset</parameter> + <parameter>size</parameter> exceeds the
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size of the buffer object bound to <parameter>readtarget</parameter> or if <parameter>writeoffset</parameter> + <parameter>size</parameter>
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exceeds the size of the buffer object bound to <parameter>writetarget</parameter>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if the same buffer object is bound to both <parameter>readtarget</parameter>
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and <parameter>writetarget</parameter> and the ranges [<parameter>readoffset</parameter>, <parameter>readoffset</parameter> +
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<parameter>size</parameter>) and [<parameter>writeoffset</parameter>, <parameter>writeoffset</parameter> + <parameter>size</parameter>)
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overlap.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if zero is bound to <parameter>readtarget</parameter> or <parameter>writetarget</parameter>.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the buffer object bound to either <parameter>readtarget</parameter> or <parameter>writetarget</parameter>
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is mapped.
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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>glGenBuffers</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glBindBuffer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glBufferData</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glBufferSubData</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glGetBufferSubData</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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