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https://github.com/pascalcorpsman/fpc_doom

FPC Port of DOOM
https://github.com/pascalcorpsman/fpc_doom

code-port doom doom-2 fpc game lazarus retrogaming

Last synced: 3 months ago
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FPC Port of DOOM

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README 

          
# FPC DOOM



In this repository i try to port DOOM to Free-Pascal using OpenGL and therefore beeing platform indipendant.



> !! Attention !!

> 

> This is a work in progress, the game is already playable, but not everything is ported.

> Its highly recommended to play with debugger and Lazarus-IDE. 

> If you get a "Port me." exception, you reached the end of the actual porting progress.



The original code was released by [id-Software](https://github.com/id-Software/DOOM) unfortunatunelly 

i was not able to get the code compiled, so i decided to use the 

[crispy-doom](https://github.com/fabiangreffrath/crispy-doom) version as base (as this one directly compiled 

and was able to start and play the .wad files i have had laying around).



Also i found some usefull documentations that try to explain the code:

- https://fabiensanglard.net/doomIphone/doomClassicRenderer.php

- https://doomwiki.org/wiki/Doom_source_code

- https://doom.fandom.com/wiki/Doom_source_code

- https://doom.fandom.com/wiki/Doom_source_code_files

- https://www.youtube.com/watch?v=cqL3jvlU61c&themeRefresh=1

  

There is already a [FPC Doom](https://github.com/jval1972/FPCDoom) on the [List](https://doomwiki.org/wiki/Source_port) of 

ports, but that version only supports DirectX and therefore only supports Windows platform.



## What needs to be done to compile the code



- install [Lazarus-IDE](https://www.lazarus-ide.org/)

- install package LazOpenGLContext (is shipped with lazarus)

- download [dglOpenGL.pas](https://github.com/saschawillems/dglopengl) and store it in the units folder

- download [bass](https://www.un4seen.com) and store bass.pas in the units folder



  o Windows users:

    - copy bass.dll into root folder  

  

  o Linux users:

    - copy libbass.so to /usr/lib 

    - chmod o+r it 

  

## What needs to be done to play the game



- get a valid .wad file and copy it where the binary is beeing created (or use this [shareware](https://www.doomworld.com/3ddownloads/ports/shareware_doom_iwad.zip) version)

- read carefull the above hint and see section [progress](#progress)

- Download and install bass (see [What needs to be done to compile the code](#what-needs-to-be-done-to-compile-the-code))

- start the application (at best using the Lazarus IDE)



## Lessons learned ?



As this section is not interesting for everyone i extracted this into a separate section [lessons learned](lessons_learned.md).

Furthermore there are some special points when porting a "old" DOS application to a modern "Linux/Windows" application, which i handle in the section [DOOM vs. LCL](doom_vs_lcl.md).



## Difference to other source ports and key mappings



As i am not doing a 100% source port but more a port for me and my education (or personal needs), FPC DOOM will not be like Vanilla DOOM and even not like Crispy DOOM. To See the differences look [here](differences.md).



## Known Bugs

- Replaying of demo's does not work because the time is "glichting" away during simulation

- not really a bug, but savegames are not onderstood, thus atm not available.



## Progress:



- got crispy-doom compiled

- created initial FPC_DOOM Lazarus project

- (2025.01.03) stored everything on Github

- able to extract icon from doom_icon.pas

- w_wad.pas can now "load" the .wad file

- (2025.01.09) able to store "patches" when drawn as .bmp files to harddisc, very first extracted image "M_DOOM" ![](documentation/doom.png)

- (2025.01.10) activate OpenGL Rendering default upscale = 2 ![](documentation/first_app_rendering.png)

- (2025.01.12) integrate keyboard event loop and main menu with quit button ![](documentation/Menu_first.gif)

- (2025.01.13) finish part of menues necessary to actually start a game ![](documentation/Menu_til_start.gif)

- (2025.01.20) finish wipe function ![](documentation/wipe.gif)

- (2025.01.22) able to create very first screenrendering ![](documentation/very_first_screenrender.png) 
 still missing flats..

- (2025.01.23) finally was able to enable flats ![](documentation/with_flats.png)

- (2025.01.24) add ability to rotate player, lets take a shy look around ;) ![](documentation/rotate.gif)

- (2025.01.25) enable sprite rendering ![](documentation/sprites.png)

- (2025.01.26) give the player a weapon ![](documentation/raise_pistol.gif) 
 still not able to shoot or move :(

- (2025.01.28) enable "normal" map preview ![](documentation/am_map_normal.gif)

- (2025.01.29) enable am map cheats, and finished am functions ![](documentation/am_map_finished.gif)

- (2025.01.30) enable forward walking and falling ![](documentation/walking.gif) 
 still no strafe / clipping or interaction with the map

- (2025.02.01) enable interaction with doors ![](documentation/open_door.gif)

- (2025.02.03) able to shoot barrels ![](documentation/shoot_barrel.gif)

- (2025.02.05) First version of .wad viewer ![](documentation/WAD_Viewer_001.png)

- (2025.02.06) enable SFX engine [Video](documentation/DOOM_Sound.mp4)

- (2025.02.08) reached finish screen of level 1 ![](documentation/Hanger_Finished.gif)

- (2025.02.09) reached level 2 ![](documentation/e1m2.png) 
 still no HUD and not all secrets in level 1 possible

- (2025.02.11) finally ported everything to play e1m1 with 100% (kills, items, secret) without using cheat codes ![](documentation/e1m1_100.png)

- (2025.02.12) enable HUD ![](documentation/HUD.png) 
 mapsize not yet scaleable

- (2025.02.18) enable "invisible" drawing ![](documentation/invisible.png)

- (2025.02.28) reached finish screen ![](documentation/finish_screen.png)