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Bug 946

Summary: SDL_HapticIndex returns 0 for all devices on Windows
Product: SDL Reporter: elboato
Component: *don't know*Assignee: Edgar Simo <bobbens>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.0   
Hardware: All   
OS: Windows (All)   
Attachments: Untested patch to fix haptic index being 0 always when opening from joystick in windows.
Untested patch to fix haptic index being 0 always when opening from joystick in mac os x.

Description elboato 2010-02-12 04:44:48 UTC 
When there are more than 1 haptic devices connected SDL_HapticIndex should probably not return 0 for all devices.... I'm iterating over all haptics and outputting SDL_HapticIndex(). When I have 2 devices connected, SDL_HapticIndex always returns 0, where it should be 0 for the first, and 1 for the second. On Linux it works fine.

I worked around it by not using SDL_HapticIndex, but instead implementing it the way it is done in the linux specific file for haptic (using SDL_JoystickName and SDL_strcmp). This way it works on Windows and Linux.

BUT: (maybe this should be filed as a SEPARATE BUG)
I could not test this, but I think this might be a problem: If two times the same type of haptic controllers are connected, SDL_JoystickName() will return the same String for both of them - therefore SDL_HapticIndex will stop working on Linux as well as in my workaround. Can anybody test that?
Comment 1 Sam Lantinga 2011-02-16 04:04:14 UTC 
Hey Edgar, do you have time to take a quick look at this?
Comment 2 Edgar Simo 2011-02-20 09:02:31 UTC 
Linux uses fname, which is the name of the device path like for example /dev/input/event3 so it shouldn't have the issue. However I can confirm that it looks like haptic->index never gets properly set on windows. Have to look at mac os x also. I'll see if I can fix it real quick now.
Comment 3 Edgar Simo 2011-02-20 09:18:40 UTC 
Created attachment 580 [details]
Untested patch to fix haptic index being 0 always when opening from joystick in windows.

Untested, should fix the issue.
Comment 4 Edgar Simo 2011-02-20 09:25:00 UTC 
Created attachment 581 [details]
Untested patch to fix haptic index being 0 always when opening from joystick in mac os x.

Also untested, should fix the fact the same issue exists in mac os x.
Comment 5 Edgar Simo 2011-02-20 09:28:33 UTC 
Sorry I can't fully test. I only have systems with linux at the moment and only a single haptic device. Anyway from my checking it seems like the issue is that both windows and mac os x (not linux however) do not set the haptic->index only when creating a SDL_Haptic* from a SDL_Joystick*. However creating an SDL_Haptic* by index should work. SDL_HapticIndex uses haptic->index so therefore they always return 0 on windows/darwin when created from a joystick. Both attached patches should fix it however as mentioned before I can't test them although it's seems straight forward enough to work.
Comment 6 Sam Lantinga 2011-02-20 09:30:06 UTC 
Thanks Edgar, your patch is in:
http://hg.libsdl.org/SDL/rev/5b330ef7b8dd

elboato, can you try the latest SDL snapshot and see if this fixes your issue?
http://www.libsdl.org/tmp/SDL-1.3.zip

Thanks!
Comment 7 elboato 2011-02-20 10:49:57 UTC 
(In reply to comment #6)
> elboato, can you try the latest SDL snapshot and see if this fixes your issue?
> http://www.libsdl.org/tmp/SDL-1.3.zip

Hi folks!

Thanks a lot for your work! Unfortunately I cannot test this, because I have only one haptic device left. (I had to give back the others to the university....) Sorry!

Best regards,
elboato
Comment 8 Sam Lantinga 2011-02-20 10:53:03 UTC 
Okay, I'll mark this closed.  Please reopen it if you find any issues with it.

Thanks!