WebGL spine defaults to different blend func than native #3402
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Native spine skeleton renderer will default to blend func GL_ONE/GL_ONE_MINUS_SRC_ALPHA or GL_SRC_ALPHA/GL_ONE_MINUS_SRC_ALPHA, if none are provided. This differs from web, which would just use the nodes blend func. This commit brings web into parity with native.
The issue is described in detail here: cocos2d/cocos2d-x#16786
My fix for now is to bring web into parity with native, by making web behave the same as native. If we would rather do the opposite, I will close this PR and submit one to spine.