How can I speed up clipping CCSprite

Question

What is the best way to clip a sprite? I used CCClippingNode but its too slow on iPhone4.. Maybe there is a way to do it? with stencil buffer or with shaders?

I have some CCRenderTexture and I want to clip it with CCSprite, where there is no alpha I don't want there to be an pixel visible, and at once I may have 5-6 such nodes and it's too slow on iPhone 4 and some android devices..

Answer 1

Activate Stencil:

EAGLView *__glView = [EAGLView viewWithFrame: [window bounds]
                                 pixelFormat: kEAGLColorFormatRGBA8
                                 depthFormat: GL_DEPTH24_STENCIL8_OES
                          preserveBackbuffer: NO
                                  sharegroup: nil
                               multiSampling: NO
                             numberOfSamples: 0];

See: http://www.cocos2d-x.org/forums/6/topics/20141