[Android] WP7 supports cross-platform game engine

free I know Cocos2d-x 3 platforms have, but for the WP7 development of the game if you want to migrate to the other two platforms is to rewrite the code .

I would like to be able to not have to rewrite the code ( a small amount is acceptable ) will be able to migrate to a free Android and iOS platform game engine ?
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https://github.com/mono/MonoGame
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wp7 does not support C + +, so the code can only be written in C # .
But you can not have massive WP8 changed .

I said cocos2d
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addition , unity3d can directly support multiple platforms .
but equally supports only wp8
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native XNA also can Monogame compatible to the Android and IOS . Theoretically Cocos2d-x for XNA is also possible.
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https://github.com/mono/MonoGame  

original there is this , I went with a look .