author Sam Lantinga <>
Mon, 02 Jun 2003 14:50:22 +0000
changeset 632 85e104fe14c2
parent 386 2c5d4c22a2ac
permissions -rw-r--r--
Date: Sun, 1 Jun 2003 15:38:45 -0700 (PDT)
From: Jeff Brown <>
Subject: [patch] SDL-1.2.5 + FreeBSD joystick axes, hat fixes

Hello again! When I sent in some SDL fixes last December, I found out
they'd already been fixed in the CVS version. This time, I checked the
repository before bugging you. =)

I'm using SDL-1.2.5 on a FreeBSD 4.6.2-RELEASE system, and in the course
of getting my multi-analog-axis USB controller (with a hat switch!)
working with d2x-sdl -- the SDL port of the Descent 2 engine -- I came
across a few problems:

1) The second analog stick is reported as a slider in one direction, and
"Rz" in the other. SDL was ignoring the Rz axis, so I added Rx/Ry/Rz to
the set of things SDL considers to be axes.

2) After the above change, the set of JOYAXE_* axes for my gamepad was
{0,1,3,7}; however, d2x-sdl expects the axes to be contiguously numbered
from 0, which seems like a pretty reasonable expectation, rather than
having to scan the entire space of axes that SDL may or may not have.
So, I added a table lookup which maps the JOYAXE_* axis numbers to 0,1,...
in the order they're detected by SDL_SYS_JoystickOpen(), when reporting
them to the application. I also added a function "usage_to_joyaxe()"
which maps the USB HUG_* usage values to JOYAXE_values, since the repeated
case statements testing for HUG_* were getting out of hand.

3) The BSD joystick driver had no hat support, so I added it. It looks
like our USB library can only support one hat switch per device, which
makes life easy.

The patch against SDL-1.2.5 which implements these changes is at:

After applying, SDL's "testjoystick" reports all activity from my gamepad
correctly, and d2x works too (though it needed some other fixes).

Moving on...

There is also a problem with slightly different USBHID library interfaces
on different versions of FreeBSD. I wasn't going to mention this since the
FreeBSD port for SDL-1.2.5 (and not SDL itself) was doing the FreeBSD
version-specific patching, so I e-mailed the port maintainer with this
change. However, I see that you've incorporated the FreeBSD
version-checking stuff into the CVS version of SDL, so now it's relevant
for you too.

The problem is, the FreeBSD #if tests don't work right for FreeBSD
4.6.2-RELEASE. There may be other versions with this problem, but I've
only tested 4.6.2-R. The following patch against your latest CVS version
fixes this:

--- SDL_sysjoystick.c-1.16 Tue Apr 15 09:02:08 2003
+++ SDL_sysjoystick.c Sun Jun 1 15:10:28 2003
@@ -420,6 +420,8 @@
# else
len = hid_report_size(rd, repinfo[repind].kind, r->rid);
# endif
+# elif (__FreeBSD_version == 460002)
+ len = hid_report_size(rd, r->rid, repinfo[repind].kind);
# else
len = hid_report_size(rd, repinfo[repind].kind, &r->rid);

I hope this is all useful to you. I've been getting myself dizzy playing
Descent 2 with it, all morning!

-Jeff Brown

P.S. My USB controller is a Thrustmaster Firestorm Dual Analog 2. That's
probably irrelevant, but I threw it in for completeness.
     2 ==============================================================================
     3 Using the Simple DirectMedia Layer with Qtopia/OPIE
     4 ==============================================================================
     6 ==============================================================================
     7 I.  Setting up the Qtopia development environment.
     9   This document will not explain how to setup the Qtopia development
    10   environment. That is outside the scope of the document. You can read
    11   more on this subject in this excellent howto:
    15 ==============================================================================
    16 II.  Building the Simple DirectMedia Layer libraries using the arm
    17      cross-compiler
    19   This is somewhat tricky since the name of the compiler binaries
    20   differ from the standard. Also you should disable features not
    21   needed. The command below works for me. Note that it's all one
    22   line. You can also set the NM, LD etc environment variables
    23   separately.
    25 	NM=arm-linux-nm LD=arm-linux-ld CC=arm-linux-gcc CXX=arm-linux-g++ RANLIB=arm-linux-ranlib AR=arm-linux-ar ./configure --enable-video-qtopia --disable-video-dummy --disable-video-fbcon  --disable-video-dga --disable-arts --disable-esd --disable-alsa --disable-cdrom --disable-video-x11 --disable-nasm --prefix=/opt/Qtopia/sharp/ arm-unknown-linux-gnu
    27   One thing to note is that the above configure will include joystick
    28   support, even though you can't have joysticks on the Zaurus. The
    29   reason for this is to avoid link / compile / runtime errors with
    30   applications that have joystick support.
    32 ==============================================================================
    33 III.  Building the Simple DirectMedia Layer test programs:
    35   After installing, making sure the correct sdl-config is in your
    36   path, run configure like this:
    38 	NM=arm-linux-nm LD=arm-linux-ld CC=arm-linux-gcc CXX=arm-linux-g++ AR=arm-linux-ar ./configure arm-unknown-linux-gnu
    40 ==============================================================================
    41 IV.  Application porting notes
    43   One thing I have noticed is that applications sometimes don't exit
    44   correctly. Their icon remains in the taskbar and they tend to
    45   relaunch themselves automatically. I believe this problem doesn't
    46   occur if you exit your application using the exit() method. However,
    47   if you end main() with 'return 0;' or so, this seems to happen.
    49   Also note that when running in landscape mode - i.e requesting a
    50   window that is HEIGHT pixels wide and WIDTH pixels high, where WIDTH
    51   and HEIGHT normally is 240 and 320 - the image is blitted so that
    52   the hardware buttons are on the left side of the display. This might
    53   not always be desirable but such is the code today.
    56 ==============================================================================
    57 V.  Enjoy! :)
    59   If you have a project you'd like me to know about, or want to ask questions,
    60   go ahead and join the SDL developer's mailing list by sending e-mail to:
    64   and put "subscribe" into the subject of the message. Or alternatively you
    65   can use the web interface:
    69 ==============================================================================
    70 VI.  What is supported:
    72 Keyboard (Sharp Zaurus)
    73 Hardware buttons
    74 Stylus input (mouse)
    75 Video. Allows fullscreen both in portrait mode (up to WIDTHxHEIGHT
    76 size window) and in landscape mode (up to HEIGHTxWIDTH). 
    78 All other SDL functionality works like a normal Linux system (threads,
    79 audio etc).
    81 -- 
    82 David Hedbor <>