[PATCH 5/5] wined3d: Alpha test emulation for core profile contexts.

[Henri Verbeet]

On 1 April 2016 at 01:48, Matteo Bruni <matteo.mystral at gmail.com> wrote:
> The advantage is to avoid creating two shader variants for alpha test
> enabled vs disabled and flipping between the two when the
> WINED3D_RS_ALPHATESTENABLE state is toggled. I only have some limited
> empiric evidence but it seems like changing the alpha test function is
> very rare in practice while toggling the alpha test enabled / disabled
> is relatively common.
>
Does that happen with a lot of different shaders though? I.e., if the
draws with enabled alpha test use different shaders than the ones with
disabled alpha test it doesn't really matter. Perhaps more importantly
though, are you sure having discard() in the shader doesn't end up
disabling HiZ/HiS in some cases?