[PATCH vkd3d v2 4/4] vkd3d-shader: Import the HLSL compiler from Wine.

[Matteo Bruni]

Signed-off-by: Matteo Bruni <mbruni at codeweavers.com>
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I haven't reviewed the patch line-by-line, although the contents look
pretty familiar (including some questionable comments :D). BTW I
suspect some of those implicit type conversions might not be correct
anymore in newer shader models.

At any rate, this should be as good a starting point as any. The only
high-level point I have is that it's a bit unfortunate to introduce a
non-reentrant parser now, but it should be possible to fix that
afterwards with somewhat contained modifications (and FWIW, reducing
the number of changes compared to the version currently in Wine to the
bare minimum is a good enough reason for keeping it IMHO).

I have one specific comment:

> +/* The general IR structure is inspired by Mesa GLSL hir, even though the code
> + * ends up being quite different in practice. Anyway, here comes the relevant
> + * licensing information.

FWIW, this was quite true at the time, but it's becoming less and less
relevant. The current IR is much closer to e.g. SPIR-V than GLSL HIR
and in particular, with the change to a flat IR, the way of
manipulating the IR is also entirely different compared to Mesa GLSL
HIR and related code. Probably the only "heritage" is some of the
naming.

So I don't think the copyright blurb has much of a reason to be there
anymore. That said, I don't think carrying the hunk over is a problem,
or a big deal anyway.