FastDOOM

Doom port for DOS, based on PCDoom by @nukeykt. The goal of this port is to make it as fast as possible for 386/486 personal computers.

FastDOOM vs Original

• Added FPS ingame viewer
• Added FPS calculation after timedemo runs
• Added option to render visplanes (ceiling and floors) without textures
• Added option to render walls without textures
• Added option to render Spectres and invisible objects like real transparent objects (harder to see, a little faster to render)
• Added option to render sky as a flat fixed color
• Added option to render Spectre and invisible objects like the Sega Saturn port did
• Added option to render Spectre and invisible objects like Heretic/Hexen
• New option to show only objects that are not far away from the player. All the enemies are still rendered as they're important
• PC Speaker uses all sounds available (just for fun!)
• New mode for PC Speaker (digitized sound!)
• Disney Sound Source support
• COVOX LPT DAC support
• Adlib OPL2 PCM support
• OPL2LPT and OPL3LPT support
• Tandy 3-voice PCM support (SN76489)
• Creative Music System / Game Blaster support
• Audio-CD music support
• PCM music support (through sound fx device)
• Hercules automap support
• Native Roland MT-32 support (GM + display)
• Roland SC-55 support (display)
• Yamaha TG300 support (display)
• Yamaha MU80 support (display)
• IBM PC Music Feature card support
• ESS ESFM support
• Adlib Gold digital sound support
• Windows Sound System (WSS) support
• Lot's of optimizations to make the game run faster / smoother
• Removed low memory limit (may cause crashes with low RAM)
• New detail level: Potato. It renders the full scene with a quarter width resolution (max 80x200). Much faster rendering, specially on 386 cpu's and slow 8-bit VGA ISA cards.
• Better use of system RAM (full memory allocation)
• Removed network gaming support
• Removed joystick support
• Removed Y mouse movement (move forward/backwards)
• Added autorun support (F12 key)
• Added mono sound support
• Replaced DOS/4GW with DOS/32A providing a good speedup!
• New setup program (FDSetup 2.0, fully open source toolchain)
• New video modes (Mode 13h, MDA, CGA, EGA, Hercules, Text modes, VESA 2.0, Plantronics Colorplus, Sigma Color 400, Hercules InColor, IBM Professional Graphics Controller)
• HiRes VESA video modes support (up to 1600x1200)
• Advanced benchmark support
• Uncapped FPS mode support (frame interpolation, more than 35 fps)
• Next/previous weapon keys
• Mouse buttons can be bound to different actions (Fire, Move Forward/Backward, Strafe, Use, Speed, Previous/Next Weapon or None)
• Secrets completed counter on the automap
• VT100 terminal output support

DEMO

FastDoom 0.8 Live Demo (Texas Instruments 486DLC @40 MHz, Cirrus Logic GD-5422 ISA):

https://user-images.githubusercontent.com/8323882/147228550-bf93cc50-3c92-4a7a-b84f-65c8bbe1d3a9.mp4

Full video here

Build instructions

Requirements: Linux or WSL2 on Windows.

1. Install the toolchain:
   • OpenWatcom v2
   • NASM
   • GNU Make (recommended, significantly speeds up builds)
   • A DOS emulator for adding the DOS/32 stub: DOSEMU2 (preferred), DOSBox-X or classic DOSBox
   • 7-Zip (only for package.sh)
2. Execute source fdenv.sh
3. Build:
   • Single executable: ./build.sh <executable> [parameters] where "executable" is any of the supported targets (fdoom.exe, fdoomega.exe, fdoomt50.exe, fdm1024r.exe, fdsetup.exe, fdstart.exe, ...) and "parameters" can be any combination of:
     • -clean: cleans all generated OBJs before building
     • -stub: adds the DOS/32 stub (requires a DOS emulator)
     • -debug: generates a debug executable with symbols, traceable stack frames and a .map file; adjust dbgcfg.h to your needs
   • All the executables + automatic DOS/32 stubs: ./buildall.sh
   • Generate a full release package (ZIP): ./package.sh

Example to build a fresh FastDoom executable ready to use on real hardware:

source fdenv.sh
./build.sh fdoom.exe -clean -stub

Example to build FDSETUP and FDSTART:

source fdenv.sh
./build.sh fdsetup.exe -clean
./build.sh fdstart.exe -clean

Contributors

This project exists thanks to all the people who contribute.

Contributing

Feel free to add issues or pull requests here on GitHub. I cannot guarantee that I will accept your changes, but feel free to fork the repo and make changes as you see fit. Thanks!

License

FastDoom is released under the terms of the GPLv2 license.