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