glBindBuffer, glBufferData, glBufferSubData, glMapBuffer, glUnmapBuffer
Copyright 2005 Addison-Wesley. 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/.
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glGetBufferSubData: man3/glGetBufferSubData.xml
glGetBufferSubData returns some or all of the data from the buffer object currently bound to target. Data starting at byte offset offset and extending for size bytes is copied from the data store to the memory pointed to by data. An error is thrown if the buffer object is currently mapped, or if offset and size together define a range beyond the bounds of the buffer object's data store.
If an error is generated, no change is made to the contents of data.