Class description buffer-usage-pattern values aid the graphics driver in optimizing access to buffer objects by declaring the primary provider and consumer of data for the buffer.
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draw-usage declares that the buffer will be supplied with data from CPU memory and read from by the GPU for vertex or texture image data.
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read-usage declares that the buffer will be supplied with data from other GPU resources and read from primarily by the CPU.
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copy-usage declares that the buffer will both receive and supply data primarily for other GPU resources.
A buffer-usage-pattern is only a declaration and does not actually control access to the underlying buffer data.