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Swap Chain
In computer graphics, a swap chain is a series of virtual framebuffers utilized by the graphics card and graphics API for frame rate stabilization and several other functions. The swap chain usually exists in graphics memory, but it can exist in system memory as well. The non-utilization of a swap chain may result in stuttering rendering, but its existence and utilization are required by many graphics APIs. A swap chain with two buffers is a double buffer.
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==Function==
In every swap chain there are at least two buffers. The first framebuffer, the screenbuffer, is the buffer that is rendered to the output of the video card. The remaining buffers are known as backbuffers. Each time a new frame is displayed, the first backbuffer in the swap chain takes the place of the screenbuffer, this is called ''presentation'' or ''swapping''. A variety of other actions may be taken on the previous screenbuffer and other backbuffers (if they exist). The screenbuffer may be simply overwritten or returned to the back of the swap chain for further processing. The action taken is decided by the client application and is API dependent.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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