CCClippingNode的一个bug_manually clear the stencil buffer by drawing a ful-优快云博客

本文介绍了一个Cocos2d-x v2.1.3版本中关于模板缓冲区的问题，当使用模板测试的节点进行移动或缩放时会出现拖影现象。文章给出了从Cocos2d-iphone项目中找到的解决方案，并提供了修改后的CCClippingNode.cpp代码段。

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原文地址：http://www.cnblogs.com/icethawless/archive/2013/05/16/3082004.html

ocos2d-x v2.1.3 模板缓冲区的清空有问题，当应用了模板测试的节点移动或者缩放时，就能看出来，有明显的拖影，裁剪区域和预设的不一致。

网上搜了一下，看到cocos2d-iphone版本已经给出了解决方案，需要改一下CCClippingNode.cpp，可能是cocos2dx这边还没有同步吧：

https://github.com/cocos2d/cocos2d-iphone/commit/b02c8a8686620cfc932b90c8e1ff78d9fcbe205a

修改后代码：

///////////////////////////////////
    // CLEAR STENCIL BUFFER
    
    // manually clear the stencil buffer by drawing a fullscreen rectangle on it
    // setup the stencil test func like this:
    // for each pixel in the fullscreen rectangle
    //     never draw it into the frame buffer
    //     if not in inverted mode: set the current layer value to 0 in the stencil buffer
    //     if in inverted mode: set the current layer value to 1 in the stencil buffer
    glStencilFunc(GL_NEVER, mask_layer, mask_layer);
    glClearStencil(!m_bInverted ? 0 : ~0);
    glStencilOp(!m_bInverted ? GL_ZERO : GL_REPLACE, GL_KEEP, GL_KEEP);
    
    // draw a fullscreen solid rectangle to clear the stencil buffer
    //ccDrawSolidRect(CCPointZero, ccpFromSize([[CCDirector sharedDirector] winSize]), ccc4f(1, 1, 1, 1));
    ccDrawSolidRect(CCPointZero, ccpFromSize(CCDirector::sharedDirector()->getWinSize()), ccc4f(1, 1, 1, 1));
    glClear(GL_STENCIL_BUFFER_BIT);