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#include "cocos2d.h"
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#include "HelloWorldScene.h"
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USING_NS_CC;
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class LightCCSprite : public CCSprite
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{
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public:
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static CCSprite *spriteWithFile(const char * filename);
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virtual void draw();
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};
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****************.cpp文件******************
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#include "LightCCSprite.h"
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CCSprite *LightCCSprite::spriteWithFile(const char * filename){
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CCSprite *pobSprite = new LightCCSprite();//这里才会调用draw，而不是CCSprite的draw
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if (pobSprite && pobSprite->initWithFile(filename))
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{
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pobSprite->autorelease();
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return pobSprite;
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}
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CC_SAFE_DELETE(pobSprite);
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return NULL;
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}
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void LightCCSprite::draw(){
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//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
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((HelloWorld*)getParent())->darknessLayer->begin();
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CC_PROFILER_START_CATEGORY(kCCProfilerCategorySprit
e,"CCSprite - draw");
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CCAssert(!m_pobBatchNode,"If CCSprite is being rendered by CCSpriteBatchNode,CCSprite#draw SHOULD NOT be called");
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CC_NODE_DRAW_SETUP();
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//glClear(GL_COLOR_BUFFER_BIT);
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glBlendFunc(GL_ZERO,GL_ONE_MINUS_SRC_ALPHA);
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glColorMask(0.0f,0.0f,1.0f);//关键句
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#define kQuadSize sizeof(m_sQuad.bl)
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if (m_pobTexture!= NULL)
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{
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glBindTexture(GL_TEXTURE_2D,m_pobTexture->getName());
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}
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else
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{
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glBindTexture(GL_TEXTURE_2D,0);
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}
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// ccGLEnableVertexAttribs( kCCVertexAttribFlag_PosColorTex );
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long offset = (long)&m_sQuad;
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// vertex
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int diff = offsetof( ccV3F_C4B_T2F,vertices);
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glVertexAttribPointer(kCCVertexAttrib_Position,3,GL_FLOAT,GL_FALSE,kQuadSize,(void*) (offset + diff));
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// texCoods
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diff = offsetof( ccV3F_C4B_T2F,texCoords);
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glVertexAttribPointer(kCCVertexAttrib_TexCoords,2,(void*)(offset + diff));
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// color
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diff = offsetof( ccV3F_C4B_T2F,colors);
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glVertexAttribPointer(kCCVertexAttrib_Color,4,GL_UNSIGNED_BYTE,GL_TRUE,(void*)(offset + diff));
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glDrawArrays(GL_TRIANGLE_STRIP,4);
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glColorMask(1.0f,1.0f,1.0f);
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((HelloWorld*)getParent())->darknessLayer->end();
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}
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********************调用处*************************
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CCSprite *sprite2=LightCCSprite::spriteWithFile("light.png");//继承ccsprite新建对象
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sprite2->setPosition(ccp(100,200));
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this->addChild(sprite2,2);
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sprite2->runAction(CCRepeatForever::create((CCActionInterval *)CCSequence::create(CCMoveBy::create(3.0f,ccp(300,0)),CCMoveBy::create(0.1f,ccp(-300,NULL)));
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darknessLayer = CCRenderTexture::create(size.width,size.height);
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