Prepare for Descent

gcc-4.7 with optimizations turned on seems to have some alignment issues, the game might crash with SIGBUS anytime, with the kernel complaing:

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[  183.220793] Alignment trap: not handling instruction edd16a01 at [<000c2acc>]
[  183.228520] Unhandled fault: alignment exception (0x011) at 0x00eed33a

OK, this is not gcc's fault. It is just not guaranteed by the game logic that some values are aligned. Fortunately, the game already has some #ifdef codepaths which seem to do exactly what we need, so I updated my patch to add that preprocessor definition. My binaries are also updated, now compiled with gcc-4.7. Everything seems to work fine, so far.

I'm still confused why this did not happen with gcc-4.6 (although I was able to reproduce it when I compiled with -Os).

Can't wait to try this. Played D3 multiplayer on and off until a few years ago and can't recall if I legitimately beat D2 (think I level skipped).

Thanks to everyone for their binaries (until I have some time for compiling) and derhass for bringing this to light!

Oooh... my all-time favorite game: coOol...

Here's a good reason to get my RPI up and running... and connect all those PS/2 game controllers I kept in storage, waiting for this moment (throttle + joystick + rudder pedals).

did anyone got this running smoothly on the raspberry pi 512mb ?

I have tried to follow these steps here:
http://blog.sheasilverman.com/2012/08/descent-tutorial/

first error but no biggie: the source packages have moved to:

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wget http://www.dxx-rebirth.com/download/dxx/d1x-rebirth_v0.57.3-src.tar.gz
wget http://www.dxx-rebirth.com/download/dxx/d2x-rebirth_v0.57.3-src.tar.gz

(check http://www.dxx-rebirth.com/news/downloa ... ing-works/)

second: i included scons and libphysfs-dev to the apt-get like in step 1

and lastly: i run into an error at step 11

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scons raspberrypi=1
scons: Reading SConscript files …

===== D1X-Rebirth v0.57.3 =====

compiling on *NIX
/bin/sh: 1: sdl-config: not found
OSError: ‘sdl-config –cflags’ exited 127:
File “/home/pi/descent/d1x-rebirth_v0.57.3-src/SConstruct”, line 348:
env.ParseConfig(‘sdl-config –cflags’)
File “/usr/lib/scons/SCons/Environment.py”, line 1551:
return function(self, self.backtick(command))
File “/usr/lib/scons/SCons/Environment.py”, line 593:
raise OSError(“‘%s’ exited %d” % (command, status))

how come i dont have that sdl-config ?
please help!

best regards, Newk

Try this:

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sudo apt-get install libsdl1.2-dev

kalehrl: thank you, that worked!

now i get other errors during compiling:

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Compiling 3d/interp.c ...
In file included from 3d/interp.c:26:0:
include/byteswap.h: In function ‘GET_INTEL_INT64’:
include/byteswap.h:61:2: warning: implicit declaration of function ‘memcpy’ [-Wimplicit-function-declaration]
include/byteswap.h:61:2: warning: incompatible implicit declaration of built-in function ‘memcpy’ [enabled by default]
include/byteswap.h: In function ‘GET_INTEL_INT’:
include/byteswap.h:67:2: warning: incompatible implicit declaration of built-in function ‘memcpy’ [enabled by default]
include/byteswap.h: In function ‘GET_INTEL_SHORT’:
include/byteswap.h:73:2: warning: incompatible implicit declaration of built-in function ‘memcpy’ [enabled by default]
Compiling 3d/matrix.c ...
Compiling 3d/points.c ...
Compiling 3d/rod.c ...
Compiling 3d/setup.c ...
Compiling arch/ogl/gr.c ...
In file included from /opt/vc/include/interface/vcos/vcos.h:116:0,
                 from /opt/vc/include/interface/vmcs_host/vc_dispmanx.h:33,
                 from /opt/vc/include/bcm_host.h:46,
                 from arch/ogl/gr.c:11:
/opt/vc/include/interface/vcos/pthreads/vcos_platform.h: In function ‘vcos_event_signal’:
/opt/vc/include/interface/vcos/pthreads/vcos_platform.h:524:8: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable]
In file included from /opt/vc/include/bcm_host.h:50:0,
                 from arch/ogl/gr.c:11:
/opt/vc/include/interface/vmcs_host/vcgencmd.h: At top level:
/opt/vc/include/interface/vmcs_host/vcgencmd.h:33:27: fatal error: vchost_config.h: No such file or directory
compilation terminated.
scons: *** [arch/ogl/gr.o] Error 1
scons: building terminated because of errors.

It can't find that file so it complains about it.
Run:

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export CFLAGS="-I/opt/vc/include/interface/vmcs_host/linux"

before compiling.
You may need to start all over again with compilation.
I cross compiled d1x-rebirth if you want to try it:
https://mega.co.nz/#!VwJWyAgY!WjNKKCX0a ... Jiau3PCCDU

[Davespice]

This is one of my favorite games of the 90's. Also one of the first games I played multiplayer over a serial cable, and later on a coax BNC Novell network. Memories

The Pi is such a great platform for retro gaming, the community just keeps on giving.

I just posted a tutorial on how to build Descent (as well as binaries).

http://blog.sheasilverman.com/2012/08/descent-tutorial/

Hi SSilver2k2. I’ve just been checking out your site and saw all the other tutorials you’ve done. Jolly good work, I really like your site. I presume you’ve been keeping the instructions updated as people have been noticing issues etc?

[Davespice]

I'm very interested in having some other users beta-test this.

Hi there, I just wanted to give a quick report on how this went for me

Compilation went fine as per instructions however I needed to use the fix, mentioned by kalehrl above, regarding the vmcs_host interface.

One slight difference is that I am using the hog/ham files from the original games since I own both. Descent 1 on floppy and Descent 2 on CD. I already had Descent 1 installed, but I used Dos Box to install D2 to a folder on disk.

After copying the data files I was able to get both games to load however only Descent 1 was actually playable (although sound was a little choppy). Descent 2 start up and game menus were fine but it had a major hall of mirrors effect (link) after I moved forwards with the ship. After this I noticed that the game menus lost their background texture and were just a big white box etc. This makes me wonder if my Descent 2 hog/ham files are corrupted. I know that the CD is quite badly scratched.

One thing I did try was to download the 1.2 D2 patch and then run it under Dos Box to modify the vanilla 1.0 data files from the CD. I was hopeful that this would cure the hall of mirrors but it didn’t, so either my data files are bad or something is wrong in the code.

I’m going to try another copy of the CD that I’ll borrow from a friend and see if I get the same results.

I’m happy to share my data files if anyone wants to try and reproduce this.

EDIT: FIXED IT. I needed to set 128/128 GPU memory split in raspi-config

This is one of my favorite games of the 90's. Also one of the first games I played multiplayer over a serial cable, and later on a coax BNC Novell network. Memories

The Pi is such a great platform for retro gaming, the community just keeps on giving.

I just posted a tutorial on how to build Descent (as well as binaries).

http://blog.sheasilverman.com/2012/08/descent-tutorial/

Hi SSilver2k2. I’ve just been checking out your site and saw all the other tutorials you’ve done. Jolly good work, I really like your site. I presume you’ve been keeping the instructions updated as people have been noticing issues etc?

I haven't been keeping up with Descent as much as I should Been working on PiMAME. My big idea is to put everything on one distro

I'll take a look at the updates for this

[Davespice]

I'll take a look at the updates for this

I think you only need to fix the links for the two source code tar balls, those seem to have been moved to the dxx-rebirth.com server (here) and add the extra export line for the vmcs_host interface. Then it'll be good.

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export CFLAGS="-I/opt/vc/include/interface/vmcs_host/linux"

Hi all,

Thnx for the hints.

I've currently not much time left over for this project, but I will make the suggested improvements, soon. Note that in the meantime, my RPi patches have been integrated into the official dxx-rebirth repo, which has now moved from bzr to git and can be found at: https://github.com/dxx-rebirth/dxx-rebirth/

Note that for some reason, the patches are in the d2x-rebirth/master and bzr/d2x-rebirth/master branch, but currently not in the d1x-branches (nor in master). I will investigate this.

I also think that further improvements regarding sound and performance/resource consumption might be possible, but they would require some deeper changes.

Regards,
derhass

[Davespice]

I would agree on the sound actually. I would say that is the only issue. Everything works really well, sound though is quite often choppy or cutting out. Even if I use the -nosdlmixer switch

To give a short status update:

The rpi support for d1x/d2x can now be found in the d1x-rebirth/master and d2x-rebirth/master branches of the git repo at https://github.com/dxx-rebirth/dxx-rebirth. These branches are the basis for the upcomong 0.58 release of the game, so there will be an "official" tarball with rpi support soon. Maybe I can try to build some raspbian binary packages, too.

The sound issue is still open, I haven't looked into it, yet.