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：
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// ShaderBlur |
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class SpriteBlur : public CCSprite |
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{ |
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public: |
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~SpriteBlur(); |
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void setBlurSize(float f); |
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bool initWithTexture(CCTexture2D* texture, const CCRect& rect); |
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void draw(); |
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void initProgram(); |
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void listenBackToForeground(CCObject *obj); |
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static SpriteBlur* create(const char *pszFileName); |
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CCPoint blur_; |
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GLfloat sub_[4]; |
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GLuint blurLocation; |
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GLuint subLocation; |
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}; |
实现：
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SpriteBlur::~SpriteBlur() |
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{ |
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CCNotificationCenter::sharedNotificationCenter()->removeObserver(this, EVENT_COME_TO_FOREGROUND); |
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} |
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SpriteBlur* SpriteBlur::create(const char *pszFileName) |
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{ |
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SpriteBlur* pRet = new SpriteBlur(); |
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if (pRet && pRet->initWithFile(pszFileName)) |
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{ |
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pRet->autorelease(); |
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} |
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else |
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{ |
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CC_SAFE_DELETE(pRet); |
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} |
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|
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return pRet; |
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} |
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void SpriteBlur::listenBackToForeground(CCObject *obj) |
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{ |
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setShaderProgram(NULL); |
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initProgram(); |
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} |
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bool SpriteBlur::initWithTexture(CCTexture2D* texture, const CCRect& rect) |
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{ |
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if( CCSprite::initWithTexture(texture, rect) ) |
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{ |
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CCNotificationCenter::sharedNotificationCenter()->addObserver(this, |
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callfuncO_selector(SpriteBlur::listenBackToForeground), |
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EVENT_COME_TO_FOREGROUND, |
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NULL); |
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|
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CCSize s = getTexture()->getContentSizeInPixels(); |
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blur_ = ccp(1/s.width, 1/s.height); |
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sub_[0] = sub_[1] = sub_[2] = sub_[3] = 0; |
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this->initProgram(); |
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|
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return true; |
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} |
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return false; |
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} |
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void SpriteBlur::initProgram() |
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{ |
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GLchar * fragSource = (GLchar*) CCString::createWithContentsOfFile( |
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CCFileUtils::sharedFileUtils()->fullPathForFilename("Shaders/example_Blur.fsh").c_str())->getCString(); |
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CCGLProgram* pProgram = new CCGLProgram(); |
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pProgram->initWithVertexShaderByteArray(ccPositionTextureColor_vert, fragSource); |
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setShaderProgram(pProgram); |
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pProgram->release(); |
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|
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CHECK_GL_ERROR_DEBUG(); |
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|
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getShaderProgram()->addAttribute(kCCAttributeNamePosition, kCCVertexAttrib_Position); |
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getShaderProgram()->addAttribute(kCCAttributeNameColor, kCCVertexAttrib_Color); |
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getShaderProgram()->addAttribute(kCCAttributeNameTexCoord, kCCVertexAttrib_TexCoords); |
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|
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CHECK_GL_ERROR_DEBUG(); |
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|
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getShaderProgram()->link(); |
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|
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CHECK_GL_ERROR_DEBUG(); |
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|
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getShaderProgram()->updateUniforms(); |
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|
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CHECK_GL_ERROR_DEBUG(); |
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|
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subLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "substract"); |
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blurLocation = glGetUniformLocation( getShaderProgram()->getProgram(), "blurSize"); |
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|
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CHECK_GL_ERROR_DEBUG(); |
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} |
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void SpriteBlur::draw() |
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{ |
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ccGLEnableVertexAttribs(kCCVertexAttribFlag_PosColorTex ); |
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ccBlendFunc blend = getBlendFunc(); |
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ccGLBlendFunc(blend.src, blend.dst); |
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getShaderProgram()->use(); |
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getShaderProgram()->setUniformsForBuiltins(); |
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getShaderProgram()->setUniformLocationWith2f(blurLocation, blur_.x, blur_.y); |
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getShaderProgram()->setUniformLocationWith4fv(subLocation, sub_, 1); |
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ccGLBindTexture2D( getTexture()->getName()); |
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// |
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// Attributes |
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// |
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#define kQuadSize sizeof(m_sQuad.bl) |
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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, GL_FLOAT, GL_FALSE, kQuadSize, (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, kQuadSize, (void*)(offset + diff)); |
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); |
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CC_INCREMENT_GL_DRAWS(1); |
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} |
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void SpriteBlur::setBlurSize(float f) |
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{ |
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CCSize s = getTexture()->getContentSizeInPixels(); |
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blur_ = ccp(1/s.width, 1/s.height); |
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blur_ = ccpMult(blur_,f); |
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} |
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：
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static SpriteBlur* createWithTexture(CCTexture2D *pTexture); |
实现：
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SpriteBlur* SpriteBlur::createWithTexture(CCTexture2D *pTexture) |
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{ |
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CCAssert(pTexture != NULL, "Invalid texture for sprite"); |
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CCRect rect = CCRectZero; |
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rect.size = pTexture->getContentSize(); |
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SpriteBlur* pRet = new SpriteBlur(); |
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if (pRet && pRet->initWithTexture(pTexture,rect)) |
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{ |
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pRet->autorelease(); |
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} |
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else |
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{ |
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CC_SAFE_DELETE(pRet); |
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} |
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|
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return pRet; |
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} |
用法：
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SpriteBlur *bluredSpr = SpriteBlur::createWithTexture(tex); |
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bluredSpr->setPosition(ccp(sz.width/2,sz.height/2)); |
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bluredSpr->setBlurSize(0.9f); // 这里稍微设小一点 |
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addChild(bluredSpr); |
效果：
注意：
他需要一个fsh文件（具体看它的实现），似乎是叠texture用的，找到example_Blur.fsh放到你的Resources\Shaders目录下
