cocos2d 制作光晕特效

*********************.h文件*********************

#include "cocos2d.h"

#include "HelloWorldScene.h"

USING_NS_CC;

class LightCCSprite : public CCSprite

{

public:

static CCSprite *spriteWithFile(const char * filename);

virtual void draw();

};

****************.cpp文件******************

#include "LightCCSprite.h"

CCSprite *LightCCSprite::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 LightCCSprite::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();

CC_PROFILER_START_CATEGORY(kCCProfilerCategorySprit e,"CCSprite - draw");

CCAssert(!m_pobBatchNode,"If CCSprite is being rendered by CCSpriteBatchNode,CCSprite#draw SHOULD NOT be called");

CC_NODE_DRAW_SETUP();

//glClear(GL_COLOR_BUFFER_BIT);

glBlendFunc(GL_ZERO,GL_ONE_MINUS_SRC_ALPHA);

glColorMask(0.0f,0.0f,1.0f);//关键句

#define kQuadSize sizeof(m_sQuad.bl)

if (m_pobTexture!= NULL)

{

glBindTexture(GL_TEXTURE_2D,m_pobTexture->getName());

}

else

{

glBindTexture(GL_TEXTURE_2D,0);

}

// ccGLEnableVertexAttribs( kCCVertexAttribFlag_PosColorTex );

long offset = (long)&m_sQuad;

// vertex

int diff = offsetof( ccV3F_C4B_T2F,vertices);

glVertexAttribPointer(kCCVertexAttrib_Position,3,GL_FLOAT,GL_FALSE,kQuadSize,(void*) (offset + diff));

// texCoods

diff = offsetof( ccV3F_C4B_T2F,texCoords);

glVertexAttribPointer(kCCVertexAttrib_TexCoords,2,(void*)(offset + diff));

// color

diff = offsetof( ccV3F_C4B_T2F,colors);

glVertexAttribPointer(kCCVertexAttrib_Color,4,GL_UNSIGNED_BYTE,GL_TRUE,(void*)(offset + diff));

glDrawArrays(GL_TRIANGLE_STRIP,4);

glColorMask(1.0f,1.0f,1.0f);

((HelloWorld*)getParent())->darknessLayer->end();

}

********************调用处*************************

CCSprite *sprite2=LightCCSprite::spriteWithFile("light.png");//继承ccsprite新建对象

sprite2->setPosition(ccp(100,200));

this->addChild(sprite2,2);

sprite2->runAction(CCRepeatForever::create((CCActionInterval *)CCSequence::create(CCMoveBy::create(3.0f,ccp(300,0)),CCMoveBy::create(0.1f,ccp(-300,NULL)));

darknessLayer = CCRenderTexture::create(size.width,size.height);

darknessLayer->setPosition(ccp( size.width /2,size.height/2 ));

this->addChild(darknessLayer,20);

darknessLayer->clear(0,0.5f);//设置黑夜笼罩

*********************最终效果************************