'\" t
.\"     Title: glCopyBufferSubData
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.76.1 <http://docbook.sf.net/>
.\"      Date: 05/30/2012
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "GLCOPYBUFFERSUBDATA" "3G" "05/30/2012" "[FIXME: source]" "[FIXME: manual]"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
glCopyBufferSubData \- copy part of the data store of a buffer object to the data store of another buffer object
.SH "C SPECIFICATION"
.HP \w'void\ glCopyBufferSubData('u
.BI "void glCopyBufferSubData(GLenum\ " "readtarget" ", GLenum\ " "writetarget" ", GLintptr\ " "readoffset" ", GLintptr\ " "writeoffset" ", GLsizeiptr\ " "size" ");"
.SH "PARAMETERS"
.PP
\fIreadtarget\fR
.RS 4
Specifies the target from whose data store data should be read\&.
.RE
.PP
\fIwritetarget\fR
.RS 4
Specifies the target to whose data store data should be written\&.
.RE
.PP
\fIreadoffset\fR
.RS 4
Specifies the offset, in basic machine units, within the data store of
\fIreadtarget\fR
from which data should be read\&.
.RE
.PP
\fIwriteoffset\fR
.RS 4
Specifies the offset, in basic machine units, within the data store of
\fIwritetarget\fR
to which data should be written\&.
.RE
.PP
\fIsize\fR
.RS 4
Specifies the size, in basic machine units, of the data to be copied from
\fIreadtarget\fR
to
\fIwritetarget\fR\&.
.RE
.SH "DESCRIPTION"
.PP

\fBglCopyBufferSubData\fR
copies part of the data store attached to
\fIreadtarget\fR
to the data store attached to
\fIwritetarget\fR\&. The number of basic machine units indicated by
\fIsize\fR
is copied from the source, at offset
\fIreadoffset\fR
to the destination at
\fIwriteoffset\fR, also in basic machine units\&.
.PP

\fIreadtarget\fR
and
\fIwritetarget\fR
must be
\fBGL_ARRAY_BUFFER\fR,
\fBGL_COPY_READ_BUFFER\fR,
\fBGL_COPY_WRITE_BUFFER\fR,
\fBGL_ELEMENT_ARRAY_BUFFER\fR,
\fBGL_PIXEL_PACK_BUFFER\fR,
\fBGL_PIXEL_UNPACK_BUFFER\fR,
\fBGL_TEXTURE_BUFFER\fR,
\fBGL_TRANSFORM_FEEDBACK_BUFFER\fR
or
\fBGL_UNIFORM_BUFFER\fR\&. Any of these targets may be used, although the targets
\fBGL_COPY_READ_BUFFER\fR
and
\fBGL_COPY_WRITE_BUFFER\fR
are provided specifically to allow copies between buffers without disturbing other GL state\&.
.PP

\fIreadoffset\fR,
\fIwriteoffset\fR
and
\fIsize\fR
must all be greater than or equal to zero\&. Furthermore,
\fIreadoffset\fR
+
\fIsize\fR
must not exceeed the size of the buffer object bound to
\fIreadtarget\fR, and
\fIreadoffset\fR
+
\fIsize\fR
must not exceeed the size of the buffer bound to
\fIwritetarget\fR\&. If the same buffer object is bound to both
\fIreadtarget\fR
and
\fIwritetarget\fR, then the ranges specified by
\fIreadoffset\fR,
\fIwriteoffset\fR
and
\fIsize\fR
must not overlap\&.
.SH "NOTES"
.PP

\fBglCopyBufferSubData\fR
is available only if the GL version is 3\&.1 or greater\&.
.SH "ERRORS"
.PP

\fBGL_INVALID_VALUE\fR
is generated if any of
\fIreadoffset\fR,
\fIwriteoffset\fR
or
\fIsize\fR
is negative, if
\fIreadoffset\fR
+
\fIsize\fR
exceeds the size of the buffer object bound to
\fIreadtarget\fR
or if
\fIwriteoffset\fR
+
\fIsize\fR
exceeds the size of the buffer object bound to
\fIwritetarget\fR\&.
.PP

\fBGL_INVALID_VALUE\fR
is generated if the same buffer object is bound to both
\fIreadtarget\fR
and
\fIwritetarget\fR
and the ranges [\fIreadoffset\fR,
\fIreadoffset\fR
+
\fIsize\fR) and [\fIwriteoffset\fR,
\fIwriteoffset\fR
+
\fIsize\fR) overlap\&.
.PP

\fBGL_INVALID_OPERATION\fR
is generated if zero is bound to
\fIreadtarget\fR
or
\fIwritetarget\fR\&.
.PP

\fBGL_INVALID_OPERATION\fR
is generated if the buffer object bound to either
\fIreadtarget\fR
or
\fIwritetarget\fR
is mapped\&.
.SH "SEE ALSO"
.PP

\fBglGenBuffers\fR(),
\fBglBindBuffer\fR(),
\fBglBufferData\fR(),
\fBglBufferSubData\fR(),
\fBglGetBufferSubData\fR()
.SH "COPYRIGHT"
.PP
Copyright
\(co
2010 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\&.
\m[blue]\fBhttp://opencontent\&.org/openpub/\fR\m[]\&.