this is a dirty hook for cocos2d-x done on a hurry, it'll be rewritten again, but it kinda works now.
the objective is to make it easy and fast to use:

bool ScSpineBoy::init()
{
    _boy = CCSpine::makeSpine("spineboy-skeleton.json", "boy.png", "boy.plist");
    _boy->loadAnimation("spineboy-walk.json", "walk");
    _boy->loadAnimation("spineboy-jump.json", "jump");
    
_boy->playAnimation("jump", 0, true);

CCSize stageSize = CCDirector::sharedDirector()->getWinSize();
_boy->setPosition(stageSize.width * 0.5, stageSize.height * 0.1);

addChild(_boy);

scheduleUpdate();

return true;
}

void ScSpineBoy::update(float delta)
{
    _boy->update(delta);
}

and yeah it forces the usage of a texture atlas, I used Texture Packer.