[Bug 7284] Max Payne 2 light reflections on people are too bright and blocky

http://bugs.winehq.org/show_bug.cgi?id=7284





--- Comment #30 from Tobias Jakobi <liquid.acid(a)gmx.net>  2009-03-28 18:12:09 ---
Sorry, I just read the post again.

The problem seems to be in MUL, right?

I mean the D3D rcp behaviour is probably right, since the D3D8 docs mention
that RCP(0.0) produces +INFTY. It's not so clear for ARB_vp and GLSL, at least
I don't find anything in the docs (yet).

But what's +INFTY times ZERO? I found no clue about that in the D3D8 docs.

The ARB_vp docs only mention this:
---------------------------------------------------

The following rules apply to multiplication:

1. <x> * <y> == <y> * <x>, for all <x> and <y>.
2. +/-0.0 * <x> = +/-0.0, at least for all <x> that correspond to
   representable numbers (IEEE "not a number" and "infinity" encodings
   may be exceptions).
3. +1.0 * <x> = <x>, for all <x>.

Multiplication by zero and one should be invariant, as it may be used to
evaluate conditional expressions without branching.
---------------------------------------------------
So we're experiencing case 2 here?!
I can't say I understand the last part properly. To me this sounds like
multiplying by ZERO should always produce ZERO, regardless of the other factor.


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