Typical Time Scale
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- Windows ã¿ã¹ã¯ã¹ã¤ãã
- å²ãè¾¼ã¿ã«ãããã®ã¯ typical ã« 10 msec, 15 msec, 55 msec, 1 msec ãªã©ãªã©ï¼Windows ã®ã¿ã¹ã¯ã¹ã¤ããã¯ã¿ã¤ãã¼å²ãè¾¼ã¿ãå©ç¨ãã¦ãã*1ï¼ã¿ã¤ãã¼å²ãè¾¼ã¿ã«ããã¿ã¹ã¯ã¹ã¤ããã®æ大ã¬ã¤ãã³ã·ã¯ timeBeginPeriod ã§å¤åããï¼timeBeginPeriod ãè¨å®ããå²ãè¾¼ã¿å¨æã¯ã·ã¹ãã ã°ãã¼ãã«ãªãªã½ã¼ã¹ã§ï¼å¥ã¢ããªã±ã¼ã·ã§ã³ãå¤æ´ãããï¼ãWindows Media Player èµ·åãã¦ããã FPS ãä¸ãã£ãä¾*2ãï¼ãD3DPRESENT_INTERVAL_DEFAULT ã¯ã¿ã¤ãå²ãè¾¼ã¿ééãããã©ã«ãã®ã¾ã¾ã«ããã®ã«å¯¾ã D3DPRESENT_INTERVAL_ONE ã¯ã¿ã¤ãå²ãè¾¼ã¿ééãå¤ãã*3ããªã©åç §ã®ãã¨ï¼
- æç»(1) Present() ãããããªä¿¡å·ã¾ã§
- ãã«ã¹ã¯ãªã¼ã³ã§ããã©ã«ãè¨å®ã ã¨æ大 3 ãã¬ã¼ã åï¼ã¤ã¾ã 3/fps sec ãããã¯é 延ãããã(id:NyaRuRu:20050124#p2)ï¼ã¨ãããã¨ã¯ Upper limit 50 msec @ 60FPS ãããï¼
- æç»(2) ãããªä¿¡å·ããç»é¢ã¸ã®åæ å®äºã¾ã§
- 液æ¶ã ã¨å ¬ç§°å¤ã§æ° msec ãã 16 msec, 25 msec, 50 msec ãªã©ãªã©ï¼ã¨ã¯è¨ã£ã¦ããããå¤åãå§ãã¦ããã®æéãã®ãã¨ã ããããï¼ãã£ãããããã¡ã«ããã¦èª¿æ´ãè¡ããããªä»çµã¿(3次å N/Rã®ãããª)ãããã¨çµ¶å¯¾çãªã¬ã¤ãã³ã·ã¯ãã£ã¨å¤§ããããï¼CRT ã«ãã¦ãç»é¢å ¨ä½ãåæã«æãæããããã§ã¯ãªãããï¼å·¦ä¸ã¨å³ä¸ã®ç»ç´ ã§ã¯ 60FPS 㧠15 msec 以ä¸æéã®ãããçºçãã*4ï¼
- ãµã¦ã³ã
- æ° msec ã 100 msec 以ä¸*5ï¼PCI ã«ããã£ã¦ããããã¤ã¹ã¨ USB 㨠IEEE 1394 ã§ã®éãããã§ãã¯ï¼
*1:http://www.microsoft.com/whdc/system/CEC/mm-timer.mspx
*2:[]http://bbx.hp.infoseek.co.jp/cgi-bin/bbx.cgi?log=40&vew=472[]
*3:http://msdn.microsoft.com/library/default.asp?url=/library/en-us/directx9_c/directx/graphics/reference/d3d/constants/D3DPRESENT.asp
*4:http://www.radiumsoftware.com/0308.html#030825
*5:http://pc.watch.impress.co.jp/docs/2004/0204/nishikawa.htm