WebGL ã¯å§å¦¹ API (OpenGL ã OpenGL ES) ã¨åæ§ã«ãæ¡å¼µæ©è½ã«å¯¾å¿ãã¦ãã¾ããæ¡å¼µæ©è½ã®å®å ¨ãªä¸è¦§ã¯ Khronos WebGL Extension ã¬ã¸ã¹ããªã¼ã§ç¢ºèªã§ãã¾ãã
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æ£è¦æ¡å¼µæ©è½åã¨ãã³ãã¼æ¥é è¾ã¨è¨å®æ¡å¼µæ©è½ã¯å
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ã WEBKIT_
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æå ç«¯ã®æ¡å¼µæ©è½ã使ç¨ãããå ´åãããã³å ¬èªãããã¨ãã«ãåä½ãç¶ããããã«ãããï¼ãã¡ããããã®æ¡å¼µæ©è½ãäºææ§ã失ãããã«å¤æ´ããã¦ããªããã®ã¨ãã¾ãï¼å ´åã¯ããã³ãã¼æ¡å¼µæ©è½åã ãã§ãªãæ£è¦æ¡å¼µæ©è½åãåãåããã¾ããä¾ãã°ä»¥ä¸ã®ããã«ãã¾ãã
var ext =
gl.getExtension("OES_vertex_array_object") ||
gl.getExtension("MOZ_OES_vertex_array_object") ||
gl.getExtension("WEBKIT_OES_vertex_array_object");
ãã³ãã¼æ¥é è¾ã¯æ¬¡ç¬¬ã«æ¡ç¨ãããªããªã£ã¦ãããã»ã¨ãã©ã®ãã©ã¦ã¶ã¼ã¯å®é¨çãªæ¡å¼µæ©è½ããã³ãã¼æ¥é è¾ã§ã¯ãªãæ©è½ãã©ã°ã§å¶å¾¡ããããã«å®è£ ãã¦ãã¾ãã
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webgl.enable-draft-extensions
chrome://flags/#enable-webgl-draft-extensions
WebGL æ¡å¼µæ©è½ã«ã¯ã "ANGLE", "OES", "EXT", "WEBGL" ã¨ããæ¥é è¾ãä»ãã¾ãããããã®æ¥é è¾ã¯ãç±æ¥ãæå³ãåæ ãã¦ãã¾ãã
ANGLE_
: ANGLE ã©ã¤ãã©ãªã¼ ã®ä½è
ã«ãã£ã¦æ¸ãããæ¡å¼µæ©è½ã§ããOES_
㨠KHR_
: OpenGL ES (OES) ã¾ã㯠OpenGL API æ¡å¼µã®æ©è½ããã©ã¼ããæ¡å¼µã§ãããããã®ã¢ã¼ããã¯ãã£æ¤è¨å§å¡ä¼ (Khronos) ã«ãã£ã¦æ¿èªããããã®ã§ããOVR_
: ä»®æ³ç¾å®ã«æé©åããæ¡å¼µæ©è½ã§ããEXT_
: ä»ã® OpenGL ES ã OpenGL API ã®æ¡å¼µããã©ã¼ãªã³ã°ããæ¡å¼µæ©è½ã§ããWEBGL_
: WebGL ã«ç¹åããæ¡å¼µæ©è½ã§ãè¤æ°ã®ã¦ã§ããã©ã¦ã¶ã¼ã«å¯¾å¿ãããã¨ãæå³ãã¦ãã¾ããã¾ãã OpenGL ES ã OpenGL API ãèµ·æºã¨ãããã®åä½ã大å¹
ã«å¤æ´ãããæ¡å¼µæ©è½ã«ã使ç¨ããã¾ããWebGL ã³ã³ããã¹ãã¯ãå©ç¨ã§ããæ¡å¼µæ©è½ãåãåãããæ©è½ã«å¯¾å¿ãã¦ãã¾ãã
var available_extensions = gl.getSupportedExtensions();
WebGLRenderingContext.getSupportedExtensions()
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ç¾è¡ã®æ¡å¼µæ©è½ã®ä¸è¦§:
æ¡å¼µæ©è½ æ¡å¼µæ©è½ã®æå¹åæ¡å¼µæ©è½ã使ç¨ããåã«ã WebGLRenderingContext.getExtension()
ã使ç¨ãã¦æ©è½ãæå¹åããªããã°ãªãã¾ãããä¾ãã°ä»¥ä¸ã®ããã«ãã¾ãã
var float_texture_ext = gl.getExtension("OES_texture_float");
æ¡å¼µæ©è½ã«å¯¾å¿ãã¦ããªãå ´åã®æ»ãå¤ã¯ null
ã対å¿ãã¦ããå ´åã®è¿å¤ã¯æ¡å¼µæ©è½ãªãã¸ã§ã¯ãã§ãã
WebGL ã®ã³ã¢ä»æ§ã§ä½¿ç¨ã§ããªãã·ã³ãã«ã颿°ãæ¡å¼µæ©è½ã§å®ç¾©ãã¦ããå ´åã¯ãgl.getExtension()
ã®å¼ã³åºãã«ãã£ã¦è¿ãããæ¡å¼µæ©è½ãªãã¸ã§ã¯ãã§ãããã使ç¨ã§ãã¾ãã
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