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Since we're already checking the CLUT, we can tell if it doesn't contain zero alpha, in which case a != 0 test will never fail. This is actually pretty common, even when texture alpha is not always FF.
To get to 100% compatibility, we will need a software renderer as there are games out there that do tricks that can't really be faked in a sensible way. Useful for homebrew too that mix sw and accel rendering.