README.QNX
author Sam Lantinga <slouken@libsdl.org>
Mon, 02 Jun 2003 14:50:22 +0000
changeset 632 85e104fe14c2
parent 380 bce7171e7a85
child 663 8bedd6d61642
permissions -rw-r--r--
Date: Sun, 1 Jun 2003 15:38:45 -0700 (PDT)
From: Jeff Brown <jabrown@caida.org>
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:

http://www.caida.org/~jabrown/patches/sdl-1.2.5-bsdhat.diff

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);
#endif


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.
     1 README by Mike Gorchak <mike@malva.ua>, <lestat@i.com.ua>
     2 
     3     OpenGL in window mode  works well  and  stable, in fullscreen
     4 mode too, but fullscreen mode has not been heavily tested.
     5     If you have QNX RtP 6.1.0 w/ or w/o Patch A you must download
     6 new Photon3D runtime from http://developers.qnx.com. The versions
     7 of OS before 6.1.0 are not supported.
     8 
     9 Problems:
    10 1. While  creating  OpenGL  context  software  renderer  mode  is
    11    artificially selected (QSSL made acceleration only for  Voodoo
    12    boards in fullscreen mode, sorry but I don't have  this board,
    13    if you want acceleration - you may remove some line  in source
    14    code).
    15 2. Photon has some errors in detecting  how  much bits  per pixel
    16    videomode has.
    17 3. No  shared  libraries  yet.  We  need  manually  set  flag  to
    18    'configure' --disable-shared.
    19 4. Due to Photon API limitation, flag SDL_HWSURFACE supported on-
    20    ly in case of desktop bpp is equal requested bpp in window mo-
    21    de.
    22 
    23 Some building issues:
    24 
    25     Run configure script without x11 support, e.g.:
    26 
    27     a) for OpenGL support:
    28     ./configure --prefix=/usr/local \
    29                 --disable-video-x11 \
    30                 --disable-shared
    31 
    32     b) without OpenGL support:
    33     ./configure --prefix=/usr/local \
    34                 --disable-video-x11 \
    35                 --disable-shared    \
    36                 --disable-video-opengl
    37 
    38     In test directory  also run  ./configure  script  without x11
    39 support, e.g.:
    40 
    41     ./configure  --with-sdl-prefix=/usr/local      \
    42                  --with-sdl-exec-prefix=/usr/local \
    43                  --prefix=/usr/local --without-x
    44