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148 lines
6.9 KiB
XML
148 lines
6.9 KiB
XML
<!DOCTYPE refentry [ <!ENTITY % mathent SYSTEM "math.ent"> %mathent; ]>
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<!-- Converted by db4-upgrade version 1.1 -->
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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="glGetBufferSubData">
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<info>
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<copyright>
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<year>2005</year>
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<holder>Sams Publishing</holder>
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</copyright>
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<copyright>
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<year>2011-2013</year>
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<holder>Khronos Group</holder>
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</copyright>
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</info>
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<refmeta>
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<refentrytitle>glGetBufferSubData</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glGetBufferSubData</refname>
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<refpurpose>returns a subset of a buffer object's data store</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>glGetBufferSubData</function></funcdef>
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<paramdef>GLenum <parameter>target</parameter></paramdef>
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<paramdef>GLintptr <parameter>offset</parameter></paramdef>
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<paramdef>GLsizeiptr <parameter>size</parameter></paramdef>
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<paramdef>GLvoid * <parameter>data</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 xml:id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>target</parameter></term>
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<listitem>
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<para>
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Specifies the target buffer object.
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The symbolic constant must be
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<constant>GL_ARRAY_BUFFER</constant>,
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<constant>GL_ATOMIC_COUNTER_BUFFER</constant>,
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<constant>GL_COPY_READ_BUFFER</constant>,
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<constant>GL_COPY_WRITE_BUFFER</constant>,
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<constant>GL_DRAW_INDIRECT_BUFFER</constant>,
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<constant>GL_DISPATCH_INDIRECT_BUFFER</constant>,
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<constant>GL_ELEMENT_ARRAY_BUFFER</constant>,
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<constant>GL_PIXEL_PACK_BUFFER</constant>,
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<constant>GL_PIXEL_UNPACK_BUFFER</constant>,
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<constant>GL_QUERY_RESULT_BUFFER</constant>,
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<constant>GL_TEXTURE_BUFFER</constant>,
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<constant>GL_TRANSFORM_FEEDBACK_BUFFER</constant>, or
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<constant>GL_UNIFORM_BUFFER</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>offset</parameter></term>
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<listitem>
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<para>
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Specifies the offset into the buffer object's data store from which data will be returned,
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measured in bytes.
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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 bytes of the data store region being 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>data</parameter></term>
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<listitem>
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<para>
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Specifies a pointer to the location where buffer object data is returned.
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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 xml:id="description"><title>Description</title>
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<para>
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<function>glGetBufferSubData</function> returns some or all of the data from the buffer object currently
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bound to <parameter>target</parameter>. Data starting at byte offset <parameter>offset</parameter> and
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extending for <parameter>size</parameter> bytes is copied from the data store to the memory pointed to by
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<parameter>data</parameter>. An error is thrown if the buffer object is currently mapped, or if
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<parameter>offset</parameter> and <parameter>size</parameter> together define a range beyond the bounds
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of the buffer object's data store.
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</para>
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</refsect1>
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<refsect1 xml:id="notes"><title>Notes</title>
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<para>
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If an error is generated,
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no change is made to the contents of <parameter>data</parameter>.
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</para>
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<para>
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The <constant>GL_ATOMIC_COUNTER_BUFFER</constant> target is available only if the GL version is 4.2 or greater.
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</para>
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<para>
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The <constant>GL_DISPATCH_INDIRECT_BUFFER</constant> target is available only if the GL version is 4.3 or greater.
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</para>
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<para>
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The <constant>GL_QUERY_RESULT_BUFFER</constant> target is available only if the GL version is 4.4 or greater.
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</para>
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</refsect1>
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<refsect1 xml:id="errors"><title>Errors</title>
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<para>
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<constant>GL_INVALID_ENUM</constant> is generated if <parameter>target</parameter> is not
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<constant>GL_ARRAY_BUFFER</constant>, <constant>GL_ELEMENT_ARRAY_BUFFER</constant>,
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<constant>GL_PIXEL_PACK_BUFFER</constant>, or <constant>GL_PIXEL_UNPACK_BUFFER</constant>.
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</para>
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<para>
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<constant>GL_INVALID_VALUE</constant> is generated if <parameter>offset</parameter> or
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<parameter>size</parameter> is negative, or if together they define a region of memory
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that extends beyond the buffer object's allocated data store.
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</para>
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<para>
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<constant>GL_INVALID_OPERATION</constant> is generated if the reserved buffer object name 0 is bound to <parameter>target</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 being queried is mapped.
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</para>
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</refsect1>
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<refsect1 xml:id="seealso"><title>See Also</title>
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<para>
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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>glMapBuffer</refentrytitle></citerefentry>,
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<citerefentry><refentrytitle>glUnmapBuffer</refentrytitle></citerefentry>
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</para>
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</refsect1>
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<refsect1 xml:id="Copyright"><title>Copyright</title>
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<para>
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Copyright <trademark class="copyright"/> 2005 Addison-Wesley.
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Copyright <trademark class="copyright"/> 2011-2013 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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<link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://opencontent.org/openpub/">http://opencontent.org/openpub/</link>.
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</para>
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</refsect1>
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</refentry>
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