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GLCOPYBUFFERSUBDATA(3G)                          OpenGL 3.3                          GLCOPYBUFFERSUBDATA(3G)



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_ELEMENT_ARRAY_BUFFER, GL_PIXEL_PACK_BUFFER, GL_PIXEL_UNPACK_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
       glCopyBufferSubData is available only if the GL version is 3.1 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 (C) 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.
       http://opencontent.org/openpub/.



OpenGL 3.3                                       03/08/2011                          GLCOPYBUFFERSUBDATA(3G)