新建一个hellworld 工程然后再Hellworld里面添加一个对象 CCRenderTexture * darknessLayer;

然后在在hellord init函数中添加代码

light.png采用荣光混合羽化的图用来遮盖

CCSprite 
*sprite1=LightCCSprite::spriteWithFile("light.png");//继承ccsprite新建对象
sprite1->setPosition(ccp(100,100));
this->addChild(sprite1,2);
sprite1->runAction(CCRepeatForever::actionWithAction((CCActionInterval 
*)CCSequence::actions(CCMoveBy::actionWithDuration(3.0f,ccp(300,0)),CCMoveBy::actionWithDuration(0.1f,ccp(-300,0)),NULL)));

darknessLayer = 
CCRenderTexture::renderTextureWithWidthAndHeight(size.width, 
size.height);
darknessLayer->setPosition(ccp( size.width /2 , 
size.height/2 
));
this->addChild(darknessLayer,20);
darknessLayer->clear(0,0,0,0.5f);//设置黑夜笼罩

覆盖draw函数

void 
HelloWorld::draw(){
darknessLayer->clear(0,0,0,0.8f);//必须的不然产生光亮区域不还原。。。。。
CCLayer::draw();

}

LightCCSprite需要覆盖两个函数

static CCSprite *spriteWithFile(const char * 
filename){
CCSprite *pobSprite = new 
LightCCSprite();//这里才会调用draw，而不是CCSprite的draw
if (pobSprite 
&& 
pobSprite->initWithFile(filename))
{
pobSprite->autorelease();
return 
pobSprite;
}
CC_SAFE_DELETE(pobSprite);
return 
NULL;
}
void draw(){

//CCSprite::draw();//如果不取消的话如果两个lightCCSPrite对象只有一个会产生亮光

((HelloWorld*)getParent())->darknessLayer->begin();
// glClear(GL_COLOR_BUFFER_BIT);
glBlendFunc(GL_ZERO, 
GL_ONE_MINUS_SRC_ALPHA); //
glColorMask(0.0f, 0.0f, 0.0f, 
1.0f);//关键句

#define kQuadSize sizeof(m_sQuad.bl)
if 
(m_pobTexture)
{
glBindTexture(GL_TEXTURE_2D, 
m_pobTexture->getName());
}
else
{
glBindTexture(GL_TEXTURE_2D, 
0);
}
long offset = (long)&m_sQuad;
// 
vertex
int diff = offsetof(ccV3F_C4B_T2F, 
vertices);
glVertexPointer(3, GL_FLOAT, kQuadSize, (void*)(offset + 
diff));
// color
diff = offsetof( ccV3F_C4B_T2F, 
colors);
glColorPointer(4, GL_UNSIGNED_BYTE, kQuadSize, (void*)(offset 
+ diff));
// tex coords
diff = offsetof( ccV3F_C4B_T2F, 
texCoords);
glTexCoordPointer(2, GL_FLOAT, kQuadSize, (void*)(offset + 
diff));
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

glColorMask(1.0f, 1.0f, 1.0f, 
1.0f);
((HelloWorld*)getParent())->darknessLayer->end();
}

效果图