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id-software/doom

★ 18,696C++Audience · developerComplexity · 5/5Setup · hard

TLDR

The original 1993 DOOM first-person shooter source code, released publicly by id Software, a historic C codebase for studying early 3D game engine techniques.

Mindmap

mindmap
  root((DOOM source))
    What it is
      1993 game source
      id Software release
      C codebase
    Study topics
      Rendering engine
      Map format WAD
      Game loop design
    Use cases
      Platform ports
      Engine study
      Retro game dev
    Audience
      C developers
      Game developers
      History enthusiasts
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Code map

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Things people build with this

USE CASE 1

Study how a 1993 game engine renders a 3D-like world without a modern GPU using raycasting techniques.

USE CASE 2

Port the DOOM game to a new platform or embedded device using the original C source as a base.

USE CASE 3

Learn how early game programmers handled collision detection, game loops, and map loading in plain C.

Tech stack

CC++

Getting it running

Difficulty · hard Time to first run · 1day+

No setup documentation is provided in the repository, requires resolving 1993-era C compatibility issues for modern compilers.

No license information mentioned in the explanation.

In plain English

This is the open-source release of the original DOOM source code, published by id Software. DOOM is the landmark 1993 first-person shooter game. The repository contains the game's C source code as it was released publicly. No further description or setup documentation is provided in the repository itself.

Copy-paste prompts

Prompt 1
I have the original DOOM source code from id Software. Walk me through how the rendering engine draws walls without a modern GPU, explain the core loop in plain English.
Prompt 2
I want to compile the original DOOM source code on a modern Linux machine. What build system changes and header compatibility fixes do I need to make it compile with gcc today?
Prompt 3
Explain how the DOOM WAD file format works: what data is stored, how the engine reads it, and show me a Python script to parse and list the lumps in a WAD file.
Prompt 4
Show me which files and functions in the DOOM source code handle player movement and collision detection, walk me through the relevant C code.
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