The Genesis of BetLang and the DOOM Challenge

Developer Alex Matveev embarked on an ambitious project: to rewrite the entire engine of id Software's iconic 1993 first-person shooter, DOOM, in a programming language he conceived himself, dubbed 'BetLang'. This undertaking, resulting in approximately 56,000 lines of BetLang code, serves as a monumental proof-of-concept for Matveev's new language, demonstrating its potential for complex, performance-critical applications. The decision to tackle DOOM is not arbitrary; its original C source code is well-documented and widely studied, making it an ideal benchmark for evaluating a new language's capabilities in areas like memory management, graphics rendering, and low-level system interaction.

Matveev's BetLang is designed with a focus on practicality and performance, aiming to offer a modern alternative for systems programming that balances expressiveness with efficiency. The DOOM recreation allowed him to push the language's boundaries, testing its mettle against a real-world, demanding application. The sheer scale of the project—reimplementing a game engine that was cutting-edge for its time—highlights the developer's dedication and the maturity he believes BetLang has already achieved.

Screenshot of DOOM running with the BetLang engine, displaying familiar gameplay elements

Deconstructing the DOOM Engine in BetLang

The original DOOM engine is a marvel of early 3D graphics and game design. It employs techniques like raycasting for rendering 2D maps into a 3D-like perspective, managing sprite rendering, collision detection, and game logic. Replicating this in BetLang required Matveev to build equivalents for key functionalities. This includes:

  • Rendering Pipeline: Implementing the core of the game's visual presentation, translating the 2D map data and sprite information into the pixels displayed on screen. This involves handling depth sorting, texture mapping, and lighting calculations, all crucial for the game's characteristic look.
  • Game Logic and Physics: Recreating the rules of the game world, including player movement, enemy AI, projectile trajectories, and hit detection. This is where the language's ability to handle complex state management and conditional logic is tested.
  • Resource Management: Efficiently loading and managing game assets such as WAD files (which contain levels, textures, and sounds), ensuring smooth gameplay without stuttering. This touches upon BetLang's memory management and I/O capabilities.
  • Input Handling: Processing keyboard and mouse inputs to control the player character, a fundamental aspect of any interactive game.

The choice of DOOM as a target is particularly significant. Its engine, while now considered classic, was highly optimized for the hardware of the early 1990s. Achieving parity or even improvement in performance with a newly developed language is a substantial technical feat. The 56,000 lines of code represent not just a port, but a ground-up reimplementation, allowing Matveev to make deliberate design choices within BetLang that might differ from the original C implementation.

BetLang: Design Philosophy and Implications

While specific details about BetLang's internal architecture are not extensively detailed in the provided source, the successful recreation of the DOOM engine suggests it possesses features essential for systems programming. These likely include:

  • Performance: A compiled language with low-level memory control capabilities, essential for the demands of game engines.
  • Concurrency: Potential support for multi-threading or asynchronous operations, which can be leveraged for modern game development to handle tasks like AI, physics, and rendering in parallel.
  • Safety Features: It's possible BetLang incorporates modern safety features to prevent common programming errors, even while allowing low-level access. This would be a significant differentiator from languages like C, which are prone to memory corruption bugs.
  • Expressiveness: The ability to write complex logic and data structures in a relatively concise manner, as evidenced by the 56,000 lines of code handling the entire DOOM engine.

The project's existence raises questions about the future of systems programming languages. With established players like C++, Rust, and Go, any new entrant needs to offer compelling advantages. BetLang's potential lies in its ability to provide a streamlined development experience for performance-intensive tasks without sacrificing control. The DOOM project demonstrates that BetLang is not just theoretical; it's capable of running complex, real-time applications.

Why This Matters Beyond Retro Gaming

While resurrecting DOOM in a new language is a fascinating technical achievement for retro computing enthusiasts, its implications are far broader. Matveev's work showcases BetLang's potential for a variety of demanding applications, including:

  • Operating Systems Development: The low-level control and performance characteristics are prerequisites for kernel development.
  • Embedded Systems: Its efficiency could make it suitable for resource-constrained environments.
  • High-Performance Computing: Scientific simulations, financial modeling, and other computationally intensive tasks could benefit from a language that offers both speed and modern development paradigms.
  • Game Development: Beyond retro titles, BetLang could be a viable option for developing new, performance-critical game engines or components.

The challenge now for BetLang and Matveev is to build a community and ecosystem around the language. A successful language requires not just a robust compiler and runtime, but also documentation, libraries, tooling, and adoption by other developers. The DOOM project is a powerful statement, but sustained growth will depend on attracting a broader developer base. For now, it stands as a testament to what can be achieved when a developer's passion for a classic game meets their ambition to create a new tool for the future.