[Bug 42631] Mouse drift, jump or don' t react to small slow movements in Unity-engine games and Fallout 4 ( partly fixed in Unity games, have walkaround in Fallout4 )

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=42631

--- Comment #58 from Henri Verbeet <hverbeet at gmail.com> ---
(In reply to Jordan Galby from comment #57)
> Created attachment 62161 [details]
> Fix sub pixel raw motion v3
> 
> I fixed it to C99 comments (sorry), and tweaked them to describe a bit more
> "why" than "how". I guess it would be wiser to consider it as a POC rather
> than a "submittable fix" for now. For example:
> - I'm wondering if there could be a better place for `double accum;` ?
Putting it in struct x11drv_valuator_data doesn't seem wrong to me.

> - should `accum` be initialized to `0` or the current pixel fraction of the
> absolute position ?
You could probably make a good argument for using the current fraction. I'm not
sure whether it would really matter in practice though.

> - is there a windows API that can handle sub-pixel mouse motion ? (or mouse
> dpi ?)
Rawinput (WM_INPUT) is supposed to report unscaled/unfiltered values, so
wouldn't need to report fractional values. I'm not aware of any API that
reports fractional values on Windows. Ultimately, I think mouse input should go
through the HID layer, but I wouldn't expect that to happen very soon.

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