glFlushMappedBufferRange - indicate modifications to a range of a mapped buffer
GLsync glFlushMappedBufferRange(GLenum target, GLintptr offset, GLsizeiptr length);
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 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.
GL_INVALID_VALUE is generated if offset or length is negative, or if offset + length exceeds the size of the mapping.
GL_INVALID_OPERATION is generated if zero is bound to target.
GL_INVALID_OPERATION is generated if the buffer bound to target is not mapped, or is mapped without the GL_MAP_FLUSH_EXPLICIT flag.
glMapBufferRange(), glMapBuffer(), glUnmapBuffer()
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