我看webgl中是支持 texelFetch这个方法的啊，为啥到cocos creator里面就不支持了
music1 (variant) : Failed to compile fs 0 (ln 57):
‘texelFetch’ : no matching overloaded function found:
float f = texelFetch(audioTex, ivec2(int(index) * 512/ lines,.1),0).x;
at E:\CocosDashboard\resources.editors\Creator\2.4.8\resources\engine\bin.cache\dev\cocos2d\renderer\core\program-lib.js:288:12
at Array.forEach ()
at ProgramLib.getProgram (E:\CocosDashboard\resources.editors\Creator\2.4.8\resources\engine\bin.cache\dev\cocos2d\renderer\core\program-lib.js:281:14)
at ForwardRenderer._draw (E:\CocosDashboard\resources.editors\Creator\2.4.8\resources\engine\bin.cache\dev\cocos2d\renderer\core\base-renderer.js:352:32)
at ForwardRenderer._drawItems (E:\CocosDashboard\resources.editors\Creator\2.4.8\resources\engine\bin.cache\dev\cocos2d\renderer\renderers\forward-renderer.js:330:14)
at ForwardRenderer._opaqueStage (E:\CocosDashboard\resources.editors\Creator\2.4.8\resources\engine\bin.cache\dev\cocos2d\renderer\renderers\forward-renderer.js:363:10)
at ForwardRenderer._render (E:\CocosDashboard\resources.editors\Creator\2.4.8\resources\engine\bin.cache\dev\cocos2d\renderer\core\base-renderer.js:239:7)
at ForwardRenderer.render (E:\CocosDashboard\resources.editors\Creator\2.4.8\resources\engine\bin.cache\dev\cocos2d\renderer\renderers\forward-renderer.js:126:12)
at Function.render (E:\CocosDashboard\resources.editors\Creator\2.4.8\resources\engine\bin.cache\dev\cocos2d\core\renderer\render-flow.js:282:12)