This is mainly useful if you want an authentic pixellated look with 1x
rendering (or software) and nearest display filter. It'll simply round
down the auto-scaled sized to the nearest integer scale factor,
configuring exactly which one isn't that interesting since they all are
gonna look good.
Fixes#17093
Fixes#17014
Even if our depth-testing-equal heuristic believes that the game needs
lower depth resolution.
This removes some depth-fighting artifacts (that are present on the real
PSP, but nice to avoid) in Outrun, Split/Second and Cars: Race-o-Rama -
essentially reverting these to the behavior we had before the heuristic.
(The heuristic is good though - it means less compat.ini hacks going in
the other direction).
In the case of Outrun, this relies on two passes that pass exactly the
same vertex coordinates twice resulting in the exact same final
geometry. This is actually guaranteed by the spec if the vertex math is
exactly the same and "invariant" is set on the position output, though
I guess you never know.. Haven't seen any issues at least.
Also sneak in disabling some validation messages from using extra Vulkan
validation layers other than the default.
Copies to a framebuffer instead of RAM.
Confirmed through e-mail that is fixes the performance drop from #16714,
but unknown whether there are any regressions in the rest of the game.
I guess we'll find out.
