[cocos2d-x]对CCSprite进行高斯模糊

摘要 cocos2d-x2.2.1 中没有直接用于模糊精灵的类，但是在TestCpp里面的ShaderTest实现了高斯模糊。于是直接搬过来用就行了。cocos2d-x 高斯模糊精灵 blur你可以从下面的目录找到示例的源代码：cocos2d-x-2.2.1\samples\Cpp\TestCpp\Classes\ShaderTestSpri

丁小未

6235人浏览 · 2014-01-12 22:47:45

丁小未 · 2014-01-12 22:47:45 发布

摘要 cocos2d-x 2.2.1 中没有直接用于模糊精灵的类，但是在TestCpp里面的ShaderTest实现了高斯模糊。于是直接搬过来用就行了。

cocos2d-x 高斯模糊精灵 blur

你可以从下面的目录找到示例的源代码：

cocos2d-x-2.2.1\samples\Cpp\TestCpp\Classes\ShaderTest

SpriteBlur类用于实现高斯模糊，但并没有定义在ShaderTest.h中，打开ShaderTest.cpp，大概在488行有这个类的定义和实现：

 
// ShaderBlur
 
 
 
class SpriteBlur : public CCSprite
 
{
 
public:
 
    ~SpriteBlur();
 
    void setBlurSize(float f);
 
    bool initWithTexture(CCTexture2D* texture, const CCRect&  rect);
 
    void draw();
 
    void initProgram();
 
    void listenBackToForeground(CCObject *obj);
 
 
 
    static SpriteBlur* create(const char *pszFileName);
 
 
 
    CCPoint blur_;
 
    GLfloat    sub_[4];
 
 
 
    GLuint    blurLocation;
 
    GLuint    subLocation;
 
};

实现：

 
SpriteBlur::~SpriteBlur()
 
{
 
    CCNotificationCenter::sharedNotificationCenter()->removeObserver(this, EVENT_COME_TO_FOREGROUND);
 
}
 
 
 
SpriteBlur* SpriteBlur::create(const char *pszFileName)
 
{
 
    SpriteBlur* pRet = new SpriteBlur();
 
    if (pRet && pRet->initWithFile(pszFileName))
 
    {
 
        pRet->autorelease();
 
    }
 
    else
 
    {
 
        CC_SAFE_DELETE(pRet);
 
    }
 
     
 
    return pRet;
 
}
 
 
 
void SpriteBlur::listenBackToForeground(CCObject *obj)
 
{
 
    setShaderProgram(NULL);
 
    initProgram();
 
}
 
 
 
bool SpriteBlur::initWithTexture(CCTexture2D* texture, const CCRect& rect)
 
{
 
    if( CCSprite::initWithTexture(texture, rect) ) 
 
    {
 
        CCNotificationCenter::sharedNotificationCenter()->addObserver(this,
 
                                                                      callfuncO_selector(SpriteBlur::listenBackToForeground),
 
                                                                      EVENT_COME_TO_FOREGROUND,
 
                                                                      NULL);
 
         
 
        CCSize s = getTexture()->getContentSizeInPixels();
 
 
 
        blur_ = ccp(1/s.width, 1/s.height);
 
        sub_[0] = sub_[1] = sub_[2] = sub_[3] = 0;
 
 
 
        this->initProgram();
 
         
 
        return true;
 
    }
 
 
 
    return false;
 
}
 
 
 
void SpriteBlur::initProgram()
 
{
 
    GLchar * fragSource = (GLchar*) CCString::createWithContentsOfFile(
 
                                CCFileUtils::sharedFileUtils()->fullPathForFilename("Shaders/example_Blur.fsh").c_str())->getCString();
 
    CCGLProgram* pProgram = new CCGLProgram();
 
    pProgram->initWithVertexShaderByteArray(ccPositionTextureColor_vert, fragSource);
 
    setShaderProgram(pProgram);
 
    pProgram->release();
 
     
 
    CHECK_GL_ERROR_DEBUG();
 
     
 
    getShaderProgram()->addAttribute(kCCAttributeNamePosition, kCCVertexAttrib_Position);
 
    getShaderProgram()->addAttribute(kCCAttributeNameColor, kCCVertexAttrib_Color);
 
    getShaderProgram()->addAttribute(kCCAttributeNameTexCoord, kCCVertexAttrib_TexCoords);
 
     
 
    CHECK_GL_ERROR_DEBUG();
 
     
 
    getShaderProgram()->link();
 
     
 
    CHECK_GL_ERROR_DEBUG();
 
     
 
    getShaderProgram()->updateUniforms();
 
     
 
    CHECK_GL_ERROR_DEBUG();
 
     
 
    subLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "substract");
 
    blurLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "blurSize");
 
     
 
    CHECK_GL_ERROR_DEBUG();
 
}
 
 
 
void SpriteBlur::draw()
 
{
 
    ccGLEnableVertexAttribs(kCCVertexAttribFlag_PosColorTex );
 
    ccBlendFunc blend = getBlendFunc();
 
    ccGLBlendFunc(blend.src, blend.dst);
 
 
 
    getShaderProgram()->use();
 
    getShaderProgram()->setUniformsForBuiltins();
 
    getShaderProgram()->setUniformLocationWith2f(blurLocation, blur_.x, blur_.y);
 
    getShaderProgram()->setUniformLocationWith4fv(subLocation, sub_, 1);
 
 
 
    ccGLBindTexture2D( getTexture()->getName());
 
 
 
    //
 
    // Attributes
 
    //
 
#define kQuadSize sizeof(m_sQuad.bl)
 
    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, GL_FLOAT, GL_FALSE, kQuadSize, (void*)(offset + diff));
 
 
 
    // color
 
    diff = offsetof( ccV3F_C4B_T2F, colors);
 
    glVertexAttribPointer(kCCVertexAttrib_Color, 4, GL_UNSIGNED_BYTE, GL_TRUE, kQuadSize, (void*)(offset + diff));
 
 
 
 
 
    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
 
 
 
    CC_INCREMENT_GL_DRAWS(1);
 
}
 
 
 
void SpriteBlur::setBlurSize(float f)
 
{
 
    CCSize s = getTexture()->getContentSizeInPixels();
 
 
 
    blur_ = ccp(1/s.width, 1/s.height);
 
    blur_ = ccpMult(blur_,f);
 
}

好了，直接copy到你的program里面，不过有一点需要注意，就是他这个只能用一个文件(图片)create，如果需要用一个Texture初始化(因为有时候需要模糊即时的sprite)，可以稍微改装一下，加一个函数：

`1`	`static` `SpriteBlur* createWithTexture(CCTexture2D *pTexture);`

实现：

 
SpriteBlur* SpriteBlur::createWithTexture(CCTexture2D *pTexture)
 
{
 
    CCAssert(pTexture != NULL, "Invalid texture for sprite");
 
 
 
    CCRect rect = CCRectZero;
 
    rect.size = pTexture->getContentSize();
 
 
 
    SpriteBlur* pRet = new SpriteBlur();
 
    if (pRet && pRet->initWithTexture(pTexture,rect))
 
    {
 
        pRet->autorelease();
 
    }
 
    else
 
    {
 
        CC_SAFE_DELETE(pRet);
 
    }
 
     
 
    return pRet;
 
}

用法：

 
SpriteBlur *bluredSpr = SpriteBlur::createWithTexture(tex);
 
bluredSpr->setPosition(ccp(sz.width/2,sz.height/2));
 
bluredSpr->setBlurSize(0.9f); // 这里稍微设小一点
 
addChild(bluredSpr);