cocos2d-x颜色混合模式完成光照效果

使用Cocosd-x3.2的颜色混合功能和裁剪功能完成光照效果,简单易用,效果图如下:

代码如下: 
//底图,光照图(一般是有透明度的白色图) 光移动的时间,循环次数
Node * HelloWorld::createFlashNode(const std::string &spName, const std::string &splashName, float duration,int loops)
{
auto clNode = ClippingNode::create();
auto stecil = Sprite::create(spName);
clNode -> setStencil(stecil);
clNode -> setAlphaThreshold(0.1);

auto star = Sprite::create(spName);
clNode -> addChild(star);

auto splash = Sprite::create(splashName);
star -> addChild(splash);
//关键代码
splash -> setBlendFunc({GL_DST_COLOR,GL_ONE});
// splash -> setPosition(splash->getContentSize().width/2-star->getContentSize().width,splash->getContentSize().height/2);

auto place = Place::create(Vec2(splash->getContentSize().width/2-star->getContentSize().width,splash->getContentSize().height/2));
auto moto = MoveTo::create(duration, Vec2(splash->getContentSize().width/2+star->getContentSize().width,splash->getContentSize().height/2));
auto seq = Sequence::create(place,moto, NULL);
ActionInterval *repeat = nullptr;
if (loops!=-1)
{
repeat = Repeat::create(seq, loops);
}
else
{
repeat = RepeatForever::create(seq);
}
splash -> runAction(repeat);

return clNode;
}

//调用
auto no = createFlashNode(“xingxing.png”, “light.png”, 2);
this -> addChild(no);
no -> setPosition(300,300);

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