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

发布时间：2020-12-14 19:53:56 所属栏目：百科来源：网络整理

导读：分类：cocos2dx 2013-05-30 11:14 6914人阅读评论(1) 收藏举报 [cpp] view plain copy class BYGraySprite: public CCSprite{ public : BYGraySprite(); virtual ~BYGraySprite(); static BYGraySprite*create( const char *pszFileName); bool initWithTe

分类：cocos2dx 2013-05-30 11:14 6914人阅读评论(1) 收藏举报

[cpp] 
    view plain 
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 classBYGraySprite:publicCCSprite{
 
public:
 BYGraySprite();
virtual~BYGraySprite();
 staticBYGraySprite*create(constchar*pszFileName);
 boolinitWithTexture(CCTexture2D*pTexture,constCCRect&tRect);
virtualvoiddraw();
 };

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#include"BYGraySprite.h"

BYGraySprite::BYGraySprite(){
}
BYGraySprite::~BYGraySprite(){
BYGraySprite*BYGraySprite::create(char*pszFileName){
BYGraySprite*graySprite=newBYGraySprite;
if(graySprite&&graySprite->initWithFile(pszFileName)){
graySprite->autorelease();
returngraySprite;
}else{
CC_SAFE_RELEASE(graySprite);
returnNULL;
}
boolBYGraySprite::initWithTexture(CCTexture2D*pTexture,153); font-weight:bold; background-color:inherit">constCCRect&tRect){
do{
CC_BREAK_IF(!CCSprite::initWithTexture(pTexture,tRect));
GLchar*pszFragSource=
"#ifdefGL_ESn
precisionmediumpfloat;n
#endifn
uniformsampler2Du_texture;n
varyingvec2v_texCoord;n
varyingvec4v_fragmentColor;n
voidmain(void)n
{n
//ConverttogreyscaleusingNTSCweightingsn
floatgrey=dot(texture2D(u_texture,v_texCoord).rgba,vec4(0.5,0.0,0.7));n
gl_FragColor=vec4(grey,0.0);n
}";
CCGLProgram*pProgram=newCCGLProgram();
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();
this->getShaderProgram()->updateUniforms();
returntrue;
while(0);
false;
voidBYGraySprite::draw(){
ccGLEnableVertexAttribs(kCCVertexAttribFlag_PosColorTex);
ccGLBlendFunc(m_sBlendFunc.src,m_sBlendFunc.dst);
this->getShaderProgram()->use();
this->getShaderProgram()->setUniformForModelViewProjectionMatrix();
ccGLBindTexture2D(this->getTexture()->getName());
#definekQuadSizesizeof(m_sQuad.bl)
longoffset=(long)&m_sQuad;
//vertex
intdiff=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,2,0); background-color:inherit">//color
glVertexAttribPointer(kCCVertexAttrib_Color,4,GL_UNSIGNED_BYTE,GL_TRUE,248)"> glDrawArrays(GL_TRIANGLE_STRIP,4);
CC_INCREMENT_GL_DRAWS(1);
}

使用

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BYGraySprite*graySprite=BYGraySprite::create("boss.png");

graySprite->setPosition(ccp(480,320));
addChild(graySprite);

（编辑：李大同）

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