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Bug 2147

Summary: Mouse wheel won't register due to WHEEL_DOWN usage in SDL_windowsevents.c
Product: SDL Reporter: Dominik Tugend <dominik>
Component: videoAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: 2.0.0   
Hardware: x86   
OS: Windows (All)   

Description Dominik Tugend 2013-10-11 09:10:51 UTC 
Long description can be found here:
https://github.com/ValveSoftware/halflife/issues/1377#issuecomment-26082526

Short description:
The problem is in SDL_windowsevents.c:
The mouse driver of i.e. the Microsoft Wireless Mouse 5000 and the Microsoft Wireless Mouse 1000 causes WM_MOUSEWHEEL messages with delta being lower than WHEEL_DELTA, which results to motion = 0 ( short motion = GET_WHEEL_DELTA_WPARAM(wParam) / WHEEL_DELTA; ).

Possible solution:
Accumulate deltas, as the FIXME comment says there or read what Mirosoft suggests ( http://msdn.microsoft.com/en-us/library/windows/desktop/ms645617.aspx ) (either accumlate or scroll partial lines, which would require motion to be a floating point number).

(I am using SDL-2.0.0-7046)
Comment 1 Sam Lantinga 2013-10-14 03:00:10 UTC 
This should be fixed, thanks!
http://hg.libsdl.org/SDL/rev/d8fb783475d5
Comment 2 Dominik Tugend 2013-10-14 12:55:17 UTC 
Richard Rohac tested with a Microsoft Wireless Mouse 1000 and the issue seems really fixed now.

Thank you.

This should fix the problem for several Microsoft mice (i.e. when using the Microsoft Intellipoint Software), including:
Microsoft Wireless Mouse 1000
Microsoft Wireless Mouse 5000
Microsoft Intellimouse Explorer 2.0 (wireless)
Microsoft Comfort Optical Mouse 300
Comment 3 Sam Lantinga 2013-10-15 02:00:44 UTC 
Great, thanks for the report! :)