cocos2d-x CCClippingNode 专题

1.CCClippingNode在部分android上不起作用需要修改src\org\cocos2dx\lib\Cocos2dxGLSurfaceView.java

//from
public Cocos2dxGLSurfaceView onCreateView() {
　　return new Cocos2dxGLSurfaceView(this);
}

//to
public Cocos2dxGLSurfaceView onCreateView() {
　　Cocos2dxGLSurfaceView glSurfaceView = new Cocos2dxGLSurfaceView(this);
　　glSurfaceView.setEGLConfigChooser(5, 6, 5, 0, 16, 8);
　　return glSurfaceView;
}

 

2.参考cocos2d-x 3.x的写法，做如下修改。

//cocos2dx/misc_nodes/CCClippingNode.cpp

if (m_fAlphaThreshold < 1) {
#if (CC_TARGET_PLATFORM == CC_PLATFORM_MAC || CC_TARGET_PLATFORM == CC_PLATFORM_WINDOWS || CC_TARGET_PLATFORM == CC_PLATFORM_LINUX)
　　// manually save the alpha test state
　　currentAlphaTestEnabled = glIsEnabled(GL_ALPHA_TEST);
　　glGetIntegerv(GL_ALPHA_TEST_FUNC, (GLint *)&currentAlphaTestFunc);
　　glGetFloatv(GL_ALPHA_TEST_REF, &currentAlphaTestRef);
　　// enable alpha testing
　　glEnable(GL_ALPHA_TEST);
　　// check for OpenGL error while enabling alpha test
　　CHECK_GL_ERROR_DEBUG();
　　// pixel will be drawn only if greater than an alpha threshold
　　glAlphaFunc(GL_GREATER, m_fAlphaThreshold);
#else
　　// since glAlphaTest do not exists in OES, use a shader that writes
　　// pixel only if greater than an alpha threshold
　　CCGLProgram *program = CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureColorAlphaTest);
　　GLint alphaValueLocation = glGetUniformLocation(program->getProgram(), kCCUniformAlphaTestValue);
　　// set our alphaThreshold
　　program->use();// change by ix 2014-6-10 glUseProgram()将OpenGL渲染管道切换到着色器模式
　　program->setUniformLocationWith1f(alphaValueLocation, m_fAlphaThreshold);
　　// we need to recursively apply this shader to all the nodes in the stencil node
　　// XXX: we should have a way to apply shader to all nodes without having to do this
　　setProgram(m_pStencil, program);
#endif
}

 

参考：

http://blog.csdn.net/honghaier/article/details/8858743