NAME

       glCopyBufferSubData - copy part of the data store of a buffer object to the data store of another buffer
       object

C SPECIFICATION

       void glCopyBufferSubData(GLenum readtarget, GLenum writetarget, GLintptr readoffset,
                                GLintptr writeoffset, GLsizeiptr size);

PARAMETERS

       readtarget
           Specifies the target from whose data store data should be read.

       writetarget
           Specifies the target to whose data store data should be written.

       readoffset
           Specifies the offset, in basic machine units, within the data store of readtarget from which data
           should be read.

       writeoffset
           Specifies the offset, in basic machine units, within the data store of writetarget to which data
           should be written.

       size
           Specifies the size, in basic machine units, of the data to be copied from readtarget to writetarget.

DESCRIPTION

       glCopyBufferSubData copies part of the data store attached to readtarget to the data store attached to
       writetarget. The number of basic machine units indicated by size is copied from the source, at offset
       readoffset to the destination at writeoffset, also in basic machine units.

       readtarget and writetarget must be GL_ARRAY_BUFFER, GL_COPY_READ_BUFFER, GL_COPY_WRITE_BUFFER,
       GL_DRAW_INDIRECT_BUFFER, GL_DISPATCH_INDIRECT_BUFFER, GL_ELEMENT_ARRAY_BUFFER, GL_PIXEL_PACK_BUFFER,
       GL_PIXEL_UNPACK_BUFFER, GL_QUERY_BUFFER, GL_TEXTURE_BUFFER, GL_TRANSFORM_FEEDBACK_BUFFER or
       GL_UNIFORM_BUFFER. Any of these targets may be used, although the targets GL_COPY_READ_BUFFER and
       GL_COPY_WRITE_BUFFER are provided specifically to allow copies between buffers without disturbing other
       GL state.

       readoffset, writeoffset and size must all be greater than or equal to zero. Furthermore, readoffset +
       size must not exceeed the size of the buffer object bound to readtarget, and readoffset + size must not
       exceeed the size of the buffer bound to writetarget. If the same buffer object is bound to both
       readtarget and writetarget, then the ranges specified by readoffset, writeoffset and size must not
       overlap.

NOTES

       The GL_DISPATCH_INDIRECT_BUFFER and GL_SHADER_STORAGE_BUFFER targets are available only if the GL version
       is 4.3 or greater.

       The GL_QUERY_BUFFER target is available only if the GL version is 4.4 or greater.

ERRORS

       GL_INVALID_VALUE is generated if any of readoffset, writeoffset or size is negative, if readoffset + size
       exceeds the size of the buffer object bound to readtarget or if writeoffset + size exceeds the size of
       the buffer object bound to writetarget.

       GL_INVALID_VALUE is generated if the same buffer object is bound to both readtarget and writetarget and
       the ranges [readoffset, readoffset + size) and [writeoffset, writeoffset + size) overlap.

       GL_INVALID_OPERATION is generated if zero is bound to readtarget or writetarget.

       GL_INVALID_OPERATION is generated if the buffer object bound to either readtarget or writetarget is
       mapped.

SEE ALSO

       glGenBuffers(), glBindBuffer(), glBufferData(), glBufferSubData(), glGetBufferSubData()

COPYRIGHT

       Copyright © 2010-2013 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.  http://opencontent.org/openpub/.

AUTHORS

       opengl.org

opengl.org                                         10/22/2013                            GLCOPYBUFFERSUBDATA(3G)