README.PicoGUI
author Sam Lantinga <slouken@libsdl.org>
Mon, 02 Jun 2003 14:50:22 +0000
changeset 632 85e104fe14c2
parent 433 706de3956894
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.
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 ========================
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  Using SDL with PicoGUI
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 ========================
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- Originally contributed by Micah Dowty <micahjd@users.sourceforge.net>
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PicoGUI is a scalable GUI system with a unique architecture, primarily focused
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on scalability to various embedded systems. You can find more information
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including a FAQ at http://picogui.org
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To use the patch:
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  1. When compiling, add the "--enable-video-picogui" switch to ./configure
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  2. When running your program, ensure that the picogui driver for SDL
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     is in use by setting the SDL_VIDEODRIVER environment variable 
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     to "picogui".
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  3. The program must also be linked to the C client library for PicoGUI
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     (libpgui.so). If the program is being compiled with a patched SDL 
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     installed this should be done automatically. If you want to use an
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     existing binary with PicoGUI, you can set the LD_PRELOAD environment
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     variable to the path of your libpgui.so file.
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Capabilities:
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  So far only basic functionality is provided on true color (linear16/24/32)
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  devices. Accessing a memory mapped bitmap, updating the display, and handling
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  mouse/keyboard input. This functionality has been tested with several
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  applications, including mplayer, Xine, sldroids, and Abuse.
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TODO list:
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  - YUV overlays will be helpful for watching video on set top boxes or other
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    embedded devices that have some graphics acceleration hardware
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  - Account for rotated bitmap storage in pgserver
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  - Support for hiding or changing the cursor
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  - The display should be centered when the SDL application is smaller
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    than the PicoGUI panel
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  - Fullscreen or any other special modes
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  - Support for indexed and grayscale modes
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  - Probably much more...
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--- The End ---