calculated
bind, glUnmapBuffer, unbind
provides: * void setRaw( in void[] arr, size_t esize, Usage mem=Usage.STATIC_DRAW ) * void setSubRaw( size_t offset, in void[] arr ) * void storageRaw( in void[] arr, size_t esize, StorageBits[] bits )
bind, glBufferData, unbind
bind, glBufferSubData, unbind
return untyped copy of buffer data
bind, glMapBufferRange, unbind