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Date: Sun, 18 Apr 2004 16:09:53 -0400 (EDT) From: David MacCormack Subject: [SDL] Linux joystick patch I recently got myself a PS2 -> USB converter (a super joybox 5). It accepts 4 PSX/PS2 controllers. It's implemented as a HID, which is nice because it doesn't require its own driver, but the problem is that it's implemented as a *single* HID -- that is, it shows up as a single joystick with 19 axes, 4 hats, and 48 buttons. This poses a problem for a number of apps which use SDL (stella, fce ultra, zsnes, to name a few) and see only a single (physical) joystick even though there are really 4 (logical) joysticks. There are a number of these types of devices on the market, and I've seen others post messages (in the zsnes forum, for example) with the same problem, so I came up with what I think is a pretty generic solution. I patched src/joystick/linux/SDL_sysjoystic.c to include support for logical joysticks; basically, it's a static array and supporting functions that map a single physical joystick to multiple logical joysticks. The attached patch has the new code. It's wrapped inside #ifndef statements so that you can get the old behavior if you want.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 16 May 2004 18:46:24 +0000
parents 355632dca928
children
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<HTML
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>SDL_GetEventFilter</TITLE
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>SDL_GetEventFilter</H1
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><H2
>Name</H2
>SDL_GetEventFilter&nbsp;--&nbsp;Retrieves a pointer to he event filter</DIV
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>Synopsis</H2
><DIV
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><P
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><PRE
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>#include "SDL.h"</PRE
><P
><CODE
><CODE
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>SDL_EventFilter <B
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>SDL_GetEventFilter</B
></CODE
>(void);</CODE
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><H2
>Description</H2
><P
>This function retrieces a pointer to the event filter that was previously set using <A
HREF="sdlseteventfilter.html"
><TT
CLASS="FUNCTION"
>SDL_SetEventFilter</TT
></A
>. An SDL_EventFilter function is defined as:
<PRE
CLASS="PROGRAMLISTING"
>typedef int (*SDL_EventFilter)(const SDL_Event *event);</PRE
></P
></DIV
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><A
NAME="AEN5631"
></A
><H2
>Return Value</H2
><P
>Returns a pointer to the event filter or <TT
CLASS="LITERAL"
>NULL</TT
> if no filter has been set.</P
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>SDL_Event</SPAN
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>,
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>SDL_SetEventFilter</TT
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