README.WinCE
author Sam Lantinga <slouken@libsdl.org>
Mon, 02 Jun 2003 14:50:22 +0000
changeset 632 85e104fe14c2
parent 453 a6fa62b1be09
child 1251 86d0d01290ea
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 
     2 Project files for embedded Visual C++ 4.0 can be found in VisualCE.zip
     3 
     4 NOTE:
     5 There are several SDL features not available in the WinCE port of SDL.
     6 
     7 - DirectX is not yet available
     8 - Semaphores are not available
     9 - Joystick support is not available
    10 - CD-ROM control is not available
    11 
    12 In addition, there are several features that run in "degraded" mode:
    13 
    14 Preprocessor Symbol		Effect
    15 ===================		=================================
    16 
    17 SDL_systimer.c:
    18 USE_GETTICKCOUNT		Less accurate values for SDL time functions
    19 USE_SETTIMER			Use only a single marginally accurate timer
    20 
    21 SDL_syswm.c:
    22 DISABLE_ICON_SUPPORT		Can't set the runtime window icon
    23 
    24 SDL_sysmouse.c:
    25 USE_STATIC_CURSOR		Only the arrow cursor is available
    26 
    27 SDL_sysevents.c:
    28 NO_GETKEYBOARDSTATE		Can't get modifier state on keyboard focus
    29 
    30 SDL_dibevents.c:
    31 NO_GETKEYBOARDSTATE		Very limited keycode translation
    32 
    33 SDL_dibvideo.c:
    34 NO_GETDIBITS			Can't distinguish between 15 bpp and 16 bpp
    35 NO_CHANGEDISPLAYSETTINGS	No fullscreen support
    36 NO_GAMMA_SUPPORT		Gamma correction not available