Cocos2d-x中让CCSprite变灰（Gray）的简单办法

原文地址:http://blog.csdn.net/u012940116/article/details/17003841

之前一直做flash开发，像变灰，高亮，描边了这些效果非常容易实现，有现成的api直接调用即可，cocos2d-x并没有提供，所以遇到这种需求就得硬着都头寻求解决方案了，废话不多说，直接上代码：

CCColorUtil.cpp:

 //
 //  CCColorUtil.cpp
 //  quickcocos2dx
 //
 //  Created by Terran Tian on 13-11-19.
 //  Copyright (c) 2013年 qeeplay.com. All rights reserved.
 //
 #include "CCColorUtil.h"
 #include "cocos2d.h"
 using namespace cocos2d;
 void CCColorUtil::addGray(CCSprite* sp)
 {
     do
     {
         CCGLProgram* pProgram = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureGray);
         sp->setShaderProgram(pProgram);
         CHECK_GL_ERROR_DEBUG();

         sp->getShaderProgram()->addAttribute(kCCAttributeNamePosition, kCCVertexAttrib_Position);
         sp->getShaderProgram()->addAttribute(kCCAttributeNameColor, kCCVertexAttrib_Color);
         sp->getShaderProgram()->addAttribute(kCCAttributeNameTexCoord, kCCVertexAttrib_TexCoords);
         CHECK_GL_ERROR_DEBUG();

         sp->getShaderProgram()->link();
         CHECK_GL_ERROR_DEBUG();

         sp->getShaderProgram()->updateUniforms();
         CHECK_GL_ERROR_DEBUG();
     } while (0);
 }
 void CCColorUtil::removeGray(CCSprite* sp)
 {
     do
     {
         CCGLProgram* pProgram = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureColor);
         sp->setShaderProgram(pProgram);
         CHECK_GL_ERROR_DEBUG();

         sp->getShaderProgram()->addAttribute(kCCAttributeNamePosition, kCCVertexAttrib_Position);
         sp->getShaderProgram()->addAttribute(kCCAttributeNameColor, kCCVertexAttrib_Color);
         sp->getShaderProgram()->addAttribute(kCCAttributeNameTexCoord, kCCVertexAttrib_TexCoords);
         CHECK_GL_ERROR_DEBUG();

         sp->getShaderProgram()->link();
         CHECK_GL_ERROR_DEBUG();

         sp->getShaderProgram()->updateUniforms();
         CHECK_GL_ERROR_DEBUG();
     } while (0);
 }

CCColorUtil.h:

 //
 //  CCColorUtil.h
 //  quickcocos2dx
 //
 //  Created by Terran Tian on 13-11-19.
 //  Copyright (c) 2013年 qeeplay.com. All rights reserved.
 //
 #ifndef __quickcocos2dx__CCColorUtil__
 #define __quickcocos2dx__CCColorUtil__
 #include <iostream>
 #endif /* defined(__quickcocos2dx__CCColorUtil__) */
 #include "cocos2d.h"
 using namespace cocos2d;
 class CCColorUtil
 {
 public:
     static void addGray(CCSprite* sp);
     static void removeGray(CCSprite* sp);

 };