Re: [PATCH vkd3d 5/7] vkd3d-shader/hlsl: Write SM4 casts to float.

[Giovanni Mascellani]

Hi,

Il 15/09/21 09:27, Matteo Bruni ha scritto:
> Yeah, we do want to have true as ~0u for SM4+ (there is no real bool
> type in < SM4, so that doesn't matter). There is no reason to do
> things differently and there might be some other unexpected way for
> the internal representation of true to leak in a visible manner.

Ok, I got convinced by this:

http://shader-playground.timjones.io/a33fbc87153ccd6774030f11d005ad1a

Which BTW means that either we store true as ~0u, or we convert it when 
returning a bool from a function, and at that point it's easier to just 
store ~0u.

On the other hand, the same example means that strictly speaking we also 
have to canonicalize bools which the shader receives as parameters.

I'll fix my patches.

Giovanni.