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Travis Bradshaw
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The DOOM sources as originally released on December 23, 1997
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‎README.TXT

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Here it is, at long last. The DOOM source code is released for your
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non-profit use. You still need real DOOM data to work with this code.
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If you don't actually own a real copy of one of the DOOMs, you should
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still be able to find them at software stores.
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Many thanks to Bernd Kreimeier for taking the time to clean up the
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project and make sure that it actually works. Projects tends to rot if
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you leave it alone for a few years, and it takes effort for someone to
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deal with it again.
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The bad news: this code only compiles and runs on linux. We couldn't
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release the dos code because of a copyrighted sound library we used
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(wow, was that a mistake -- I write my own sound code now), and I
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honestly don't even know what happened to the port that microsoft did
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to windows.
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Still, the code is quite portable, and it should be straightforward to
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bring it up on just about any platform.
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I wrote this code a long, long time ago, and there are plenty of things
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that seem downright silly in retrospect (using polar coordinates for
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clipping comes to mind), but overall it should still be a usefull base
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to experiment and build on.
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The basic rendering concept -- horizontal and vertical lines of constant
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Z with fixed light shading per band was dead-on, but the implementation
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could be improved dramatically from the original code if it were
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revisited. The way the rendering proceded from walls to floors to
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sprites could be collapsed into a single front-to-back walk of the bsp
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tree to collect information, then draw all the contents of a subsector
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on the way back up the tree. It requires treating floors and ceilings
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as polygons, rather than just the gaps between walls, and it requires
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clipping sprite billboards into subsector fragments, but it would be
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The Right Thing.
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The movement and line of sight checking against the lines is one of the
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bigger misses that I look back on. It is messy code that had some
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failure cases, and there was a vastly simpler (and faster) solution
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sitting in front of my face. I used the BSP tree for rendering things,
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but I didn't realize at the time that it could also be used for
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environment testing. Replacing the line of sight test with a bsp line
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clip would be pretty easy. Sweeping volumes for movement gets a bit
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tougher, and touches on many of the challenges faced in quake / quake2
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with edge bevels on polyhedrons.
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Some project ideas:
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Port it to your favorite operating system.
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Add some rendering features -- transparency, look up / down, slopes,
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etc.
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Add some game features -- weapons, jumping, ducking, flying, etc.
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Create a packet server based internet game.
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Create a client / server based internet game.
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Do a 3D accelerated version. On modern hardware (fast pentium + 3DFX)
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you probably wouldn't even need to be clever -- you could just draw the
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entire level and get reasonable speed. With a touch of effort, it should
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easily lock at 60 fps (well, there are some issues with DOOM's 35 hz
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timebase...). The biggest issues would probably be the non-power of two
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texture sizes and the walls composed of multiple textures.
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I don't have a real good guess at how many people are going to be
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playing with this, but if significant projects are undertaken, it would
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be cool to see a level of community cooperation. I know that most early
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projects are going to be rough hacks done in isolation, but I would be
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very pleased to see a coordinated 'net release of an improved, backwards
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compatable version of DOOM on multiple platforms next year.
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Have fun.
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John Carmack
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12-23-97

‎linuxdoom-1.10/CVS/Entries

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/ChangeLog/1.14/Mon Feb 3 22:45:08 1997//
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/DOOMLIC.TXT/1.3/Sun Jan 26 07:44:56 1997//
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/FILES/1.1/Sun Jan 19 17:22:41 1997//
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/FILES2/1.1/Sun Jan 19 17:22:42 1997//
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/Makefile/1.6/Mon Feb 3 22:45:08 1997//
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/am_data.h/1.2/Tue Jan 21 18:59:56 1997//
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/am_map.c/1.4/Mon Feb 3 21:24:33 1997//
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/am_map.h/1.2/Tue Jan 21 18:59:56 1997//
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/d_englsh.h/1.1/Mon Feb 3 21:48:03 1997//
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/d_event.h/1.2/Mon Feb 3 22:01:47 1997//
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/d_french.h/1.3/Mon Feb 3 21:48:03 1997//
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/d_main.c/1.8/Mon Feb 3 22:45:09 1997//
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/d_net.c/1.3/Mon Feb 3 22:01:47 1997//
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/d_textur.h/1.1/Mon Feb 3 16:47:51 1997//
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/doomdata.h/1.5/Mon Feb 3 22:45:09 1997//
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/doomdef.h/1.9/Mon Feb 3 22:45:09 1997//
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/doomtype.h/1.2/Mon Feb 3 22:45:09 1997//
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/dstrings.h/1.4/Mon Feb 3 21:48:03 1997//
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/dutils.c/1.5/Mon Feb 3 17:11:23 1997//
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/dutils.h/1.4/Mon Feb 3 17:11:23 1997//
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/f_finale.c/1.5/Mon Feb 3 21:26:34 1997//
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/f_finale.h/1.1/Mon Feb 3 21:26:34 1997//
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/f_wipe.c/1.2/Mon Feb 3 22:45:09 1997//
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/f_wipe.h/1.1/Mon Feb 3 17:11:23 1997//
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/fpfunc.S/1.1/Sun Jan 19 17:22:43 1997//
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/g_game.c/1.8/Mon Feb 3 22:45:09 1997//
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/g_game.h/1.1/Mon Feb 3 21:34:47 1997//
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/hu_lib.c/1.3/Sun Jan 26 07:44:58 1997//
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/hu_lib.h/1.4/Mon Feb 3 16:47:52 1997//
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/hu_stuff.c/1.4/Mon Feb 3 16:47:52 1997//
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/hu_stuff.h/1.3/Sun Jan 26 07:44:58 1997//
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/i_dga.c/1.3/Sun Jan 26 07:44:58 1997//
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/i_ibm.c/1.3/Sun Jan 26 07:44:58 1997//
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/i_main.c/1.4/Mon Feb 3 22:45:10 1997//
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/i_pcnet.c/1.3/Sun Jan 26 07:44:59 1997//
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/i_sound.c/1.3/Sun Jan 26 07:44:59 1997//
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/i_sound.h/1.3/Sun Jan 26 07:44:59 1997//
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/i_svga.c/1.3/Sun Jan 26 07:44:59 1997//
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/i_unix.c/1.5/Mon Feb 3 22:45:10 1997//
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/i_x.c/1.6/Mon Feb 3 22:45:10 1997//
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/info.c/1.3/Sun Jan 26 07:45:00 1997//
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/info.h/1.3/Sun Jan 26 07:45:00 1997//
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/irix.c/1.3/Sun Jan 26 07:45:00 1997//
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/irix.h/1.3/Sun Jan 26 07:45:01 1997//
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/linux.c/1.3/Sun Jan 26 07:45:01 1997//
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/m_argv.c/1.1/Mon Feb 3 22:45:10 1997//
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/m_argv.h/1.1/Mon Feb 3 22:45:10 1997//
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/m_bbox.c/1.1/Mon Feb 3 22:45:10 1997//
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/m_bbox.h/1.1/Mon Feb 3 22:45:10 1997//
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/m_cheat.c/1.1/Mon Feb 3 21:24:34 1997//
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/m_cheat.h/1.1/Mon Feb 3 21:24:34 1997//
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/m_menu.c/1.7/Mon Feb 3 22:45:10 1997//
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/m_menu.h/1.1/Mon Feb 3 22:01:49 1997//
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/m_misc.c/1.6/Mon Feb 3 22:45:10 1997//
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/m_misc.h/1.1/Mon Feb 3 22:45:11 1997//
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/m_random.c/1.1/Mon Feb 3 22:45:11 1997//
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/m_random.h/1.1/Mon Feb 3 22:45:11 1997//
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/p_ceilng.c/1.4/Mon Feb 3 16:47:53 1997//
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/p_doors.c/1.4/Mon Feb 3 16:47:53 1997//
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/p_enemy.c/1.5/Mon Feb 3 22:45:11 1997//
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/p_floor.c/1.4/Mon Feb 3 16:47:54 1997//
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/p_inter.c/1.4/Mon Feb 3 22:45:11 1997//
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/p_lights.c/1.5/Mon Feb 3 22:45:11 1997//
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/p_local.h/1.3/Tue Jan 28 22:08:27 1997//
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/p_map.c/1.5/Mon Feb 3 22:45:11 1997//
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/p_maputl.c/1.5/Mon Feb 3 22:45:11 1997//
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/p_mobj.c/1.5/Mon Feb 3 22:45:12 1997//
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/p_plats.c/1.5/Mon Feb 3 22:45:12 1997//
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/p_pspr.c/1.5/Mon Feb 3 22:45:12 1997//
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/p_setup.c/1.5/Mon Feb 3 22:45:12 1997//
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/p_sight.c/1.3/Tue Jan 28 22:08:28 1997//
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/p_spec.c/1.6/Mon Feb 3 22:45:12 1997//
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/p_spec.h/1.3/Tue Jan 28 22:08:29 1997//
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/p_switch.c/1.3/Tue Jan 28 22:08:29 1997//
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/p_telept.c/1.3/Tue Jan 28 22:08:29 1997//
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/p_tick.c/1.4/Mon Feb 3 16:47:55 1997//
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/p_user.c/1.3/Tue Jan 28 22:08:29 1997//
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/r_bsp.c/1.4/Mon Feb 3 22:45:12 1997//
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/r_data.c/1.4/Mon Feb 3 16:47:55 1997//
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/r_draw.c/1.4/Mon Feb 3 16:47:55 1997//
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/r_local.h/1.4/Mon Feb 3 21:26:34 1997//
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/r_main.c/1.5/Mon Feb 3 22:45:12 1997//
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/r_plane.c/1.4/Mon Feb 3 16:47:55 1997//
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/r_segs.c/1.3/Wed Jan 29 20:10:19 1997//
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/r_things.c/1.5/Mon Feb 3 16:47:56 1997//
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/s_sound.c/1.6/Mon Feb 3 22:45:12 1997//
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/sounds.c/1.3/Wed Jan 29 22:40:44 1997//
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/sounds.h/1.3/Wed Jan 29 22:40:44 1997//
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/soundsrv.c/1.3/Wed Jan 29 22:40:44 1997//
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/soundsrv.h/1.3/Wed Jan 29 22:40:44 1997//
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/soundst.h/1.3/Wed Jan 29 22:40:45 1997//
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/st_lib.c/1.4/Mon Feb 3 16:47:56 1997//
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/st_lib.h/1.4/Mon Feb 3 16:47:56 1997//
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/st_stuff.c/1.6/Mon Feb 3 22:45:13 1997//
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/st_stuff.h/1.3/Thu Jan 30 19:54:22 1997//
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/sun.c/1.3/Thu Jan 30 19:54:22 1997//
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/tables.c/1.4/Mon Feb 3 16:47:57 1997//
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/tables.h/1.1/Mon Feb 3 16:47:57 1997//
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/tmap.S/1.1/Sun Jan 19 17:22:51 1997//
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/v_video.c/1.5/Mon Feb 3 22:45:13 1997//
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/v_video.h/1.2/Mon Feb 3 17:11:59 1997//
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/w_wad.c/1.5/Mon Feb 3 16:47:57 1997//
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/wadread.c/1.3/Thu Jan 30 19:54:23 1997//
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/wadread.h/1.3/Thu Jan 30 19:54:23 1997//
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/wi_data.h/1.3/Thu Jan 30 19:54:23 1997//
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/wi_stuff.c/1.7/Mon Feb 3 22:45:13 1997//
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/wi_stuff.h/1.4/Mon Feb 3 16:47:58 1997//
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/z_zone.c/1.4/Mon Feb 3 16:47:58 1997//
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/z_zone.h/1.1/Mon Feb 3 16:47:58 1997//

‎linuxdoom-1.10/CVS/Repository

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/info/cvsroot/id/id_doom

‎linuxdoom-1.10/CVS/Root

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/info/cvsroot/

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