[Bug 41383] normal computation with vertex blending looks wrong

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=41383

Józef Kucia <joseph.kucia at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |joseph.kucia at gmail.com

--- Comment #1 from Józef Kucia <joseph.kucia at gmail.com> ---
(In reply to Axel D from comment #0)
> There seems to be a mistake: in the non vertexblends case, ffp_normal_matrix
> is set to the transpose of the inverse of the modelview matrix. That is in
> accordance to the spec.
> However in the vertexblends case, the modelview matrices are used
> non-inversed.

That's what you would expect when implementing vertex blending. The inverse of
model view matrices was used in the the initial version of the patch [1].
However, some testing suggested that normals are simply transformed by model
view matrices [2]. It could be a good idea to add some tests for normals
transformation when vertex blending is enabled.

[1] - https://www.winehq.org/pipermail/wine-patches/2015-July/140489.html
[2] - https://www.winehq.org/pipermail/wine-devel/2015-July/108239.html

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