Multiple buffering

（重定向自Double buffer）

Sets 1, 2 and 3 represent the operation of single, double and triple buffering, respectively, with vertical synchronisation (vsync) enabled. In each graph, time flows from left to right. Note that 3 shows a swap chain, the alternative definition of a triple buffer would not pause between drawing the alternate buffers and would probably not copy C to the screen. Set 4 shows what happens when a frame (B, in this case) takes longer than normal to draw. In this case, a frame update is missed. In time-sensitive implementations such as video playback, the whole frame may be dropped. With triple buffering in set 5, drawing of frame B can start without having to wait for frame A to be copied to video memory, reducing the chance of a delayed frame missing its vertical retrace.

In computer science, multiple buffering is the use of more than one buffer to hold a block of data, so that a "reader" will see a complete (though perhaps old) version of the data, rather than a partially updated version of the data being created by a "writer". It also is used to avoid the need to use Dual-ported RAM when the readers and writers are different devices.

单词	Double buffer
释义	Double buffer 英语百科 Multiple buffering （重定向自Double buffer） In computer science, multiple buffering is the use of more than one buffer to hold a block of data, so that a "reader" will see a complete (though perhaps old) version of the data, rather than a partially updated version of the data being created by a "writer". It also is used to avoid the need to use Dual-ported RAM when the readers and writers are different devices.
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