Cocos2dx - CCSprite使用 shader生成自己想要的颜色的图片

class BYGraySprite : public CCSprite{    public:    BYGraySprite();    virtual ~BYGraySprite();    static BYGraySprite* create(const char* pszFileName);    bool initWithTexture(CCTexture2D* pTexture, const CCRect& tRect);    virtual void draw();};

#include "BYGraySprite.h"BYGraySprite::BYGraySprite(){    }BYGraySprite::~BYGraySprite(){    }BYGraySprite* BYGraySprite::create( const char* pszFileName ){    BYGraySprite* graySprite = new BYGraySprite;    if (graySprite && graySprite->initWithFile(pszFileName)){        graySprite->autorelease();        return graySprite;    }else{        CC_SAFE_RELEASE(graySprite);        return NULL;    }}bool BYGraySprite::initWithTexture(CCTexture2D* pTexture, const CCRect& tRect ){    do{        CC_BREAK_IF(!CCSprite::initWithTexture(pTexture, tRect));                GLchar* pszFragSource =        "#ifdef GL_ES \n \        precision mediump float; \n \        #endif \n \        uniform sampler2D u_texture; \n \        varying vec2 v_texCoord; \n \        varying vec4 v_fragmentColor; \n \        void main(void) \n \        { \n \        // Convert to greyscale using NTSC weightings \n \        float grey = dot(texture2D(u_texture, v_texCoord).rgba, vec4(0.5, 0.0, 0.0,0.7)); \n \        gl_FragColor = vec4(grey, 0.0, 0.0, 0.0); \n \        }";                CCGLProgram* pProgram = new CCGLProgram();        pProgram->initWithVertexShaderByteArray(ccPositionTextureColor_vert, pszFragSource);        this->setShaderProgram(pProgram);        pProgram->release();        CHECK_GL_ERROR_DEBUG();                this->getShaderProgram()->addAttribute(kCCAttributeNamePosition, kCCVertexAttrib_Position);        this->getShaderProgram()->addAttribute(kCCAttributeNameColor, kCCVertexAttrib_Color);        this->getShaderProgram()->addAttribute(kCCAttributeNameTexCoord, kCCVertexAttrib_TexCoords);        CHECK_GL_ERROR_DEBUG();                this->getShaderProgram()->link();        CHECK_GL_ERROR_DEBUG();                this->getShaderProgram()->updateUniforms();        CHECK_GL_ERROR_DEBUG();                return true;    } while (0);    return false;}void BYGraySprite::draw(){    ccGLEnableVertexAttribs(kCCVertexAttribFlag_PosColorTex );    ccGLBlendFunc( m_sBlendFunc.src, m_sBlendFunc.dst );        this->getShaderProgram()->use();    this->getShaderProgram()->setUniformForModelViewProjectionMatrix();        ccGLBindTexture2D( this->getTexture()->getName() );    #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);}

使用

    BYGraySprite* graySprite = BYGraySprite::create("boss.png");    graySprite->setPosition(ccp(480,320) );    addChild(graySprite);