## \u30b7\u30ea\u30fc\u30ba<\/p>\n
GPUSound\u5165\u9580
\nhttps:\/\/qiita.com\/MachiaWorx\/items\/68f8691d0866e0e0ff68<\/p>\n
\u307e\u305f\u3082\u3084\u8d70\u308a\u66f8\u304d\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
## \u304a\u8a66\u3057GPUSound<\/p>\n
\u3055\u3066\u3001\u307e\u305a\u306f\u306a\u3093\u304b\u66f8\u3044\u3066\u307f\u307e\u3057\u3087\u3046\u304b\u3002
\n\u4eca\u306e\u6240\u4e00\u756a\u624b\u8efd\u306a\u306e\u304c\u3001Shadertoy\u3068\u3044\u3046\u30b5\u30a4\u30c8\u3067\u97f3\u3092\u9cf4\u3089\u3059\u3053\u3068\u3067\u3059\u3002<\/p>\n
\u5b9f\u969b\u306e\u3068\u3053\u308d\uff08\u6e96\u5099\u304c\u5fc5\u8981\u3067\u3059\u304c\uff09\u3053\u308c\u3092\u30b3\u30d4\u30da\u3057\u3066\u81ea\u524d\u306e\u74b0\u5883\u3067\u9cf4\u3089\u305d\u3046\u3068\u3059\u308b\u3068\u9cf4\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u306e\u3067\u3001Shadertoy\u306e\u3068\u3053\u308d\u304b\u3089\u66f8\u3044\u3066\u307f\u308b\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/p>\n
Shadertoy\u3092\u958b\u3044\u3066\u3001New\u62bc\u4e0b
\n\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u304c\u66f8\u3044\u3066\u3042\u308b\u30bf\u30d6\u3067\u300c\uff0b\u300d\u3092\u62bc\u3057\u3066\u300cSound\u300d\u3092\u8ffd\u52a0\u3059\u308b\u3068\u4e0b\u8a18\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u304c\u8a18\u8ff0\u3055\u308c\u307e\u3059\u3002<\/p>\n
“` GLSL:SampleCode
\nvec2 mainSound( float time )
\n{
\n\/\/ A 440 Hz wave that attenuates quickly overt time
\nreturn vec2( sin(6.2831*440.0*time)*exp(-3.0*time) );
\n}
\n“`
\n\u4e00\u5ea6\u30c7\u30fc\u30bf\u3092\u7d5e\u3063\u3066\u8aac\u660e\u3057\u3066\u3044\u3053\u3046\u304b\u3068\u601d\u3044\u307e\u3059\u3002
\n\uff08exp\u95a2\u6570\u306b\u3064\u3044\u3066\u306f\u5225\u306e\u6a5f\u4f1a\u306b\uff09<\/p>\n
### \u4f55\u3092\u8a18\u8ff0\u3057\u3066\u308b\u304b\u8aac\u660e<\/p>\n
Sin\u95a2\u6570\u306f\u554f\u984c\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002
\n\u5468\u671f\u3092\u767a\u751f\u3055\u305b\u308b\u3053\u3068\u3067\u4e00\u5b9a\u306e\u97f3\u304c\u751f\u6210\u3055\u308c\u307e\u3059\u3002<\/p>\n
\u554f\u984c\u306f\u3069\u3093\u306a\u5468\u671f\u3067\u3069\u3093\u306a\u97f3\u306b\u306a\u3063\u3066\u3044\u308b\u304b\u3068\u3044\u3046\u90e8\u5206\u304b\u3068\u3002<\/p>\n
\u8a18\u8ff0\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3002<\/p>\n
return sin( 6.2831 * 440.0 * time ) * exp(-3.0*time) );<\/p>\n
\u3053\u308c\u3060\u3068\u5206\u304b\u308a\u3065\u3089\u3044\u306e\u3067\u3001\u307e\u305asin\u90e8\u5206\u3060\u3051\u306b\u3057\u3066\u3057\u307e\u3044\u307e\u3057\u3087\u3046\u3002
\n\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u30b3\u30d4\u30da\u306e\u4e0a\u5b9f\u884c\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n
“` GLSL:SampleCode2
\nvec2 mainSound( float time )
\n{
\n\/\/ \u6539\u9020
\nreturn vec2( sin(6.2831*440.0*time) );
\n}
\n“`<\/p>\n
\u305d\u3046\u3059\u308b\u3068\u6e1b\u8870\u304c\u6d88\u3048\u3066\u307e\u3059\u3002
\n\u3064\u307e\u308a\u3001\u307e\u305a\u57fa\u672c\u3068\u306a\u308b\uff08\u97f3\u304c\u767a\u751f\u3059\u308b\uff09\u30b3\u30fc\u30c9\u304c\u3042\u3063\u3066\u3001\u305d\u308c\u306b\u30d7\u30e9\u30b9\u3057\u3066\u97f3\u91cf\u3092\u5909\u66f4\u3059\u308b\u30b3\u30fc\u30c9\u304c\u5b58\u5728\u3059\u308b\u5f62\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
### \u30b5\u30a4\u30f3\u6ce2\u304c\u9cf4\u308b\u4ed5\u7d44\u307f<\/p>\n
\u6b21\u306bSampleCode2\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u304d\u307e\u3059\u3002<\/p>\n
sin( 6.2831 * 440.0 * time )<\/p>\n
\u3053\u306e\u90e8\u5206\u306f\u8a18\u8ff0\u3092\u307e\u3068\u3081\u3066\u3042\u308b\u3060\u3051\u3067\u3001\u5b9f\u969b\u306e\u3068\u3053\u308d\u306f\u4e0b\u8a18\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
sing( 3.1415 * 2 * 440.0 * time )<\/p>\n
\u9806\u306b\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n
| \u6570\u5024 |\u610f\u5473| \u5225\u540d |
\n|:—————–|:——————|:——————|
\n| 3.1415 |\u5186\u5468\u7387 | PI |
\n| 2 |\u5468\u671f\u8a08\u7b97\u306e\u305f\u3081\u306e\u6570\u5024 | – |
\n| 440.0 | \u97f3\u306e\u9ad8\u3055 |\u97f3\u968e\u3001\u5468\u6ce2\u6570|
\n| time |\u7d4c\u904e\u6642\u9593 | – |<\/p>\n
\u3053\u3053\u3067\u306f\u3001\u7d4c\u904e\u6642\u9593\u3042\u305f\u308a\u3069\u3093\u306a\u5468\u671f\u306b\u306a\u3063\u3066\u3044\u308b\u304b\u3092\u5168\u90e8\u8a08\u7b97\u3057\u3066\u3001
\n\u305d\u308c\u306b\u5bfe\u5fdc\u3057\u305f\u30b5\u30a4\u30f3\u6ce2\u3092\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u305d\u3082\u305d\u3082\u97f3\u3063\u3066\u3044\u3046\u306e\u304c\u300c\u7269\u4f53\u306e\u632f\u52d5\u306b\u3088\u3063\u3066\u767a\u751f\u3059\u308b\u300d\u3082\u306e\u3067\u3042\u3063\u3066\u3001
\n\u305d\u306e\u3068\u304d\u306e\u7279\u5b9a\u306e\u5468\u6ce2\u6570\u3092\u97f3\u968e\u3068\u3057\u3066\u5b9a\u7fa9\u3057\u3066\u308b\u5f62\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u3042\u3068\u3001\u30b5\u30a4\u30f3\u6ce2\u304c\u300c\u5468\u671f\u7684\u306a\u632f\u52d5\u3092\u884c\u3046\u300d\u3068\u3044\u3046\u8a08\u7b97\u306a\u306e\u3067\u3001
\n\u97f3\u91cf\u3092\u5909\u3048\u308b\u3053\u3068\u306a\u304f\u305a\u3063\u3068\u97f3\u304c\u51fa\u529b\u3055\u308c\u308b\u3053\u3068\u306b\u306a\u308b\u3093\u3067\u3059\u306d\u3002<\/p>\n
\u3067\u3001\u3082\u3063\u304b\u3044SampleCode2\u3092\u8868\u793a\u3057\u3068\u304d\u307e\u3059\u3002<\/p>\n
“` GLSL:SampleCode2
\nvec2 mainSound( float time )
\n{
\n\/\/ \u6539\u9020\uff08\u3061\u3087\u3044\u8a18\u8ff0\u5909\u66f4\u3057\u307e\u3057\u305f\uff09
\nreturn vec2( sin( 2 * 3.1415*440.0*time ) );
\n}
\n“`<\/p>\n
\u6570\u5024\u306e\u610f\u5473\u306f\u4e0b\u8a18\u306e\u901a\u308a\u3002\uff08\u524d\u63b2\uff09<\/p>\n
| \u6570\u5024 |\u610f\u5473| \u5225\u540d |
\n|:—————–|:——————|:——————|
\n| 3.1415 |\u5186\u5468\u7387 | PI |
\n| 2 |\u5468\u671f\u8a08\u7b97\u306e\u305f\u3081\u306e\u6570\u5024 | – |
\n| 440.0 |\u97f3\u306e\u9ad8\u3055 |\u97f3\u968e\u3001\u5468\u6ce2\u6570|
\n| time |\u7d4c\u904e\u6642\u9593 | – |<\/p>\n
\u3067\u3001\u5fc5\u8981\u306a\u5f0f\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3002
\n\u3053\u308c\u306f\u5358\u632f\u52d5\u306e\u5f0f\u306b\u306a\u308a\u307e\u3059\uff08t=\u6642\u9593\u306d\uff09<\/p>\n
f(t) = sin(\u03c9t)
\n\uff08\u03c9\uff1a2\u03c0f\u3001f\uff1a\u5468\u6ce2\u6570\uff09<\/p>\n
\u3064\u307e\u308a\u3001SampleCode2\u3067\u306f\u3001\u300c\u7279\u5b9a\u5468\u671f\u306e\u97f3\u304c\u6e1b\u8870\u305b\u305a\u306b\u305a\u3063\u3068\u9cf4\u3063\u3066\u308b\u300d\u3068\u3044\u3046\u5f0f\u306b\u306a\u308a\u307e\u3059\u3002
\n\u307e\u305f\u3001\u4eca\u56de\u306e\u30b1\u30fc\u30b9\u3067\u306ft\u306e\u5024\u306b\u3088\u3063\u3066WAV\u30921\u30b5\u30f3\u30d7\u30eb\u305a\u3064\u30d7\u30ed\u30c3\u30c8\u3059\u308b\u3068\u8003\u3048\u308b\u305f\u3081\u3001t\u3092\u3044\u3058\u308b\u3053\u3068\u306f\u6b86\u3069\u306a\u3044\u3067\u3059\u3002<\/p>\n
\u3053\u3053\u307e\u3067\u6765\u308b\u3068\u521d\u3081\u3066\u898b\u308b\u30b3\u30fc\u30c9\u3082\u305d\u3053\u307e\u3067\u6016\u3044\u3082\u306e\u3058\u3083\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
### \u97f3\u306e\u9ad8\u3055\u3092\u3044\u3058\u3063\u3066\u307f\u308b<\/p>\n
\u5358\u632f\u52d5\u306a\u306e\u3067\u30012*Pi\u90e8\u5206\u306f\u5909\u66f4\u3057\u306a\u3044\u3067\u3059\u3002
\n\u3053\u3053\u3067\u97f3\u968e\u3064\u3051\u308b\u306e\u306b\u5fc5\u8981\u306a\u306e\u306f\u97f3\u306e\u9ad8\u3055\u3001\u3059\u306a\u308f\u3061\u5468\u6ce2\u6570\u90e8\u5206\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
\u8a66\u3057\u306b\u300c440.0\u300d\u3063\u3066\u6570\u5024\u3092880.0\u306b\u5909\u66f4\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u97f3\u304c\u9ad8\u304f\u306a\u308b\u306f\u305a\u3067\u3059\u3002<\/p>\n
\u3042\u3068\u306f\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u8a08\u7b97\u3057\u3066\u3001\u7279\u5b9a\u306e\u6642\u9593\u3067\u6307\u5b9a\u3057\u305f\u5468\u6ce2\u6570\u304c\u9cf4\u308b\u3001\u3068\u3044\u3046\u5f62\u3067\u6307\u5b9a\u3057\u3066\u3057\u307e\u3048\u3070\u30e1\u30ed\u30c7\u30a3\u304c\u4f5c\u308c\u307e\u3059\u3002
\n\u3068\u3044\u3046\u3053\u3068\u3067\u3061\u3087\u3044\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u8abf\u6574\u3057\u305f\u3082\u306e\u3092\u4f5c\u3063\u3066\u307f\u307e\u3057\u305f\u3002
\n\uff08\u30d6\u30c4\u5207\u308c\u611f\u3042\u308a\u307e\u3059\u304c\u6211\u6162\u3057\u3066\u304f\u3060\u3055\u3044\uff09<\/p>\n
“` GLSL:SampleCode3
\nvec2 mainSound( float time )
\n{
\n\/\/BPM120\u306e\u56db\u5206\u97f3\u7b26\u3054\u3068\u306b\u30ab\u30a6\u30f3\u30c8\u3092\u884c\u3046
\nfloat count = mod(floor(time\/240.*120.),4.);<\/p>\n
\/\/\u4e0a\u8a18\u30ab\u30a6\u30f3\u30c8\u3054\u3068\u306b\u6307\u5b9a\u3059\u308b\u5468\u6ce2\u6570\u3092\u5909\u66f4\u3059\u308b
\nfloat inc = count * 1.05;<\/p>\n
\/\/ \u30b5\u30a4\u30f3\u6ce2\u3092\u518d\u751f\u3059\u308b\uff08\u5468\u6ce2\u6570\u306f\u6642\u9593\u3054\u3068\u306b\u5909\u5316\u3059\u308b\uff09
\nreturn vec2( sin(2*3.1415*440.0*inc*time) );
\n}
\n“`<\/p>\n
BPM\u8a08\u7b97\u306f\u3001\u4ee5\u4e0b\u306e\u69d8\u306b\u3057\u3066\u884c\u3044\u307e\u3059\u3002
\n1\u5206\u3042\u305f\u308a\u306e\u56db\u5206\u97f3\u7b26\u306e\u6570=BPM
\n1\u79d2\u3042\u305f\u308a\u306e\u56db\u5206\u97f3\u7b26\u306e\u6570\u306fBPM\/60
\n\u3067\u3001\u3053\u3053\u3067\u306f\u57fa\u6e96\u309260BPM\u306b\u3057\u3066\u3001\u305d\u306e\u4f55\u500d\u306e\u9577\u3055\u304b\u3001\u3068\u3044\u3046\u5f62\u3067\u8a08\u7b97\u3057\u3066\u307e\u3059\u3002
\n60BPM\u306e\u5834\u5408\u3001\u3061\u3087\u3046\u3069\u9577\u3055\u304c1\u5206\u306a\u306e\u3067\u3001\u6bd4\u7387\u8a08\u7b97\u3057\u3084\u3059\u3044\u3093\u3067\u3059\u306d\u3002<\/p>\n
\u3068\u3044\u3046\u3053\u3068\u3067\u4e0a\u306ecount\u306e\u5f0f\u3067\u306f\u3001\u56db\u90e8\u97f3\u7b26\u306e\u9577\u3055\u3092\u8a08\u7b97\u3057\u3066\u3001
\n\u305d\u306e\u30ab\u30a6\u30f3\u30c8\u304c\u4f55\u62cd\u76ee\u306b\u8a72\u5f53\u3059\u308b\u304b\u3060\u3051\u3092\u8a08\u7b97\u3057\u3066\u308b\u3093\u3067\u3059\u306d\u3002
\n\uff08mod\u306b\u3057\u3066\u308b\u306e\u306f\u62cd\u6570\u3060\u3051\u53d6\u308a\u305f\u3044\u304b\u3089\uff09<\/p>\n
\u3067\u3001\u305d\u306e\u62cd\u6570\u3092\u30c7\u30fc\u30bf\u30bd\u30fc\u30b9\u3068\u3057\u3066\u5468\u6ce2\u6570\u3092\u5909\u66f4\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u3059\u3002\uff08inc\u306e\u5b9a\u7fa9\u90e8\u5206\uff09<\/p>\n
\u3042\u3068\u306f\u65e2\u5b58\u306e\u30bd\u30fc\u30b9\u3068\u540c\u3058\u3067\u3001\u6700\u5f8c\u306b\u5468\u6ce2\u6570\u3092\u4ee3\u5165\u3057\u3066\u51fa\u529b\u3057\u3066\u307e\u3059\u3002<\/p>\n
\u3068\u3044\u3046\u3053\u3068\u3067\u5468\u671f\u7684\u306b\u56db\u5206\u97f3\u7b26\u306e\u9577\u3055\u3067\u30e1\u30ed\u30c7\u30a3\u3092\u9cf4\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002
\n\u3042\u3068\u306f\u3053\u308c\u3092\u3044\u3063\u3071\u3044\u4e26\u3079\u3066\u3044\u304f\u3053\u3068\u3067\u66f2\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n
## \u304a\u308f\u308a\u306b<\/p>\n
\u3061\u3087\u3044\u99c6\u3051\u8db3\u6c17\u5473\u3067\u66f8\u3044\u3066\u307f\u307e\u3057\u305f\u304c\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002
\n\u4ee5\u524d\u306f\u7d50\u69cb\u66f8\u3044\u3066\u653e\u7f6e\u3057\u305f\u308a\u3057\u3066\u66f8\u304f\u6c17\u304c\u306a\u304f\u306a\u3063\u305f\u30b1\u30fc\u30b9\u304c\u591a\u304b\u3063\u305f\u306e\u3067\u3001
\n\u8a18\u61b6\u304c\u6b8b\u3063\u3066\u3044\u308b\u3046\u3061\u306b\u66f8\u3044\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n
\u3053\u308c\u3067\u30e1\u30ed\u30c7\u30a3\u306f\u4f5c\u308c\u308b\u3088\u3046\u306b\u306a\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u3001
\n\u3042\u3068\u306f\u97f3\u8272\u30fb\u30c9\u30e9\u30e0\u30fb\u548c\u97f3\u30fb\u30d5\u30ec\u30fc\u30ba\u5236\u5fa1\u3092\u66f8\u3044\u3066\u7d42\u308f\u308a\u306b\u3057\u3088\u3046\u304b\u3068\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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