[SDL] SDL joystick directions

[Ben Campbell]

Donny Viszneki wrote:
 > On Jun 6, 2005, at 8:07 AM, Ben Campbell wrote:
 >
 >> Can anyone tell me what values SDL_JoystickGetAxis() should be
 >> returning for the Y axis?
 >> I'm using an xbox controller, with the xbcd driver
 >> (http://www.redcl0ud.com/xbcd.html) under windows, and the xpad module
 >> under linux.
 >
 > Did you build your own USB adapter? Or buy one? Just out of curiosity..

It's from Lik Sang. Much neater and tidier than anything I could 
construct myself :-)

 >> On linux, the Y axis (axis 1) returns:
 >> up: 32767
 >> down -32767
 >>
 >> On windows, the same code returns:
 >> up: -32767
 >> down: 32767
 >
 > Traditionally, negative represents the directions DOWN and LEFT. So
 > negative values on horizontal axes are left of center, and negative
 > values on vertical axes are below center. You should take a look at the
 > source code for xbcd and xpad and compare them. I recommend sending an
 > email to xbcd about the problem.

Cool - thanks for that info. So it looks like the issue is on the 
windows side. Hmmm. Xbcd seems to work OK in other (non-SDL) apps under 
windows... I wonder if there's some weird interaction between the SDL 
joystick code and xbcd? Will have to do some more investigation...

Interestingly, the (linux) xpad module seems to get the y axis on the 
D-Pad (hat?) backwards - at least using jstest. I haven't investigated 
what sdl reports yet. So a look through the xpad source is in order too...

Thanks,
Ben.