cocos2dx 我所不知的技巧

概述1、实现图片的平铺复制 local visibleSize = VisibleRect:getVisibleSize()local texture = cc.Director:getInstance():getTextureCache():addImage("repeat.jpg")texture:setTexParameters(gl.LINEAR, gl.LINEAR, gl.REPEAT 1、实现图片的平铺复制

local visibleSize = VisibleRect:getVisibleSize()local texture = cc.Director:getInstance():getTextureCache():addImage("repeat.jpg")texture:setTexParameters(gl.liNEAR,gl.liNEAR,gl.REPEAT,gl.REPEAT)local sprite = cc.Sprite:createWithTexture(texture,cc.rect(0,visibleSize.wIDth,visibleSize.height))sprite:setposition(cc.p(visibleSize.wIDth/2,visibleSize.height/2))

实现的效果，将如下的图片实现重复拼接，直到覆盖满整个visiblesize

这里需要注意的是，图片的宽和高都必须是2的次幂，否则会报错

CCASSERT((_pixelsWIDe == ccNextpot(_pixelsWIDe) || texParams.wrapS == GL_CLAMP_TO_EDGE) &&        (_pixelsHigh == ccNextpot(_pixelsHigh) || texParams.wrapT == GL_CLAMP_TO_EDGE),"GL_CLAMP_TO_EDGE should be used in NPOT dimensions");

int ccNextpot(int x){    x = x - 1;    x = x | (x >> 1);    x = x | (x >> 2);    x = x | (x >> 4);    x = x | (x >> 8);    x = x | (x >>16);    return x + 1;}

总结

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