glMapBufferRange, glMapBuffer, glUnmapBuffer
Copyright 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/.
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glFlushMappedBufferRange: man3/glFlushMappedBufferRange.xml
glFlushMappedBufferRange indicates that modifications have been made to a range of a mapped buffer. The buffer must previously have been mapped with the GL_MAP_FLUSH_EXPLICIT_BIT flag. offset and length indicate the modified subrange of the mapping, in basic units. The specified subrange to flush is relative to the start of the currently mapped range of the buffer. glFlushMappedBufferRange may be called multiple times to indicate distinct subranges of the mapping which require flushing.