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Hardware tests have shown that if the number of texgens/channels do not match, you get garbage rendering. Presumably because the output registers from the XF stage are fed into the incorrect input registers for TEV/BP. Currently, this causes Dolphin to crash/generate invalid shaders with an assertion failure in the hardware backends. Instead, we log an error. Perhaps in the future we should just spit out all texgens/colors anyway from both stages, and let cross-stage optimization take care of DCE'ing it away. But doing so would require changing the UIDs and invalidating everyone's shader caches.