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GL_ARB_map_buffer_range
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http://www.opengl.org/registry/specs/ARB/map_buffer_range.txt
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GL_MAP_WRITE_BIT 0x0002
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GL_MAP_INVALIDATE_RANGE_BIT 0x0004
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GL_MAP_INVALIDATE_BUFFER_BIT 0x0008
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GL_MAP_FLUSH_EXPLICIT_BIT 0x0010
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GL_MAP_UNSYNCHRONIZED_BIT 0x0020
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void glFlushMappedBufferRange (GLenum target, GLintptr offset, GLsizeiptr length)
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GLvoid * glMapBufferRange (GLenum target, GLintptr offset, GLsizeiptr length, GLbitfield access)