copy all or part of the data store of a buffer object to the data store of another buffer object
$readTargetSpecifies the target to which the source buffer object is bound for glCopyBufferSubData
$writeTargetSpecifies the target to which the destination buffer object is bound for glCopyBufferSubData.
$readOffsetSpecifies the offset, in basic machine units, within the data store of the source buffer object at which data will be read.
$writeOffsetSpecifies the offset, in basic machine units, within the data store of the destination buffer object at which data will be written.
$sizeSpecifies the size, in basic machine units, of the data to be copied from the source buffer object to the destination buffer object.
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