WebAssembly from Scratch: From FizzBuzz to DooM.

WebAssembly from Scratch: From FizzBuzz to DooM

Exploring WebAssembly from scratch from a backend-person-point-of-view. A story in four acts.


Welcome to my journey where I will explore some WebAssembly. We will start from scratch. My goal is to look at everything bottom-up, without much magic tooling or frameworks on our way. In this article, I prefer to build everything as much from scratch as possible.

Non-goal: We will not implement our own WebAssembly interpreter or runtime, but use existing ones, e.g., wabt or the Chrome and Firefox browsers.



Demo at https://diekmann.github.io/wasm-fizzbuzz/rust/, deployed from (Part 3) via GitHub Actions to GitHub Pages.

Play doom at https://diekmann.github.io/wasm-fizzbuzz/doom/, deployed from (Part 4) via GitHub Actions to GitHub Pages..

Owner
Cornelius Diekmann
Proving stuff in Isabelle. Computer networks and security.
Cornelius Diekmann
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Comments
  • Add a LICENSE

    Add a LICENSE

    The tutorials are great! Thank you for putting this together.

    I would like to build on the doom example for my own, "But can it run DOOM" project. Does this project have a LICENSE?

    @diekmann

  • Fix doom running at 32FPS instead of desired 35 FPS.

    Fix doom running at 32FPS instead of desired 35 FPS.

    A simple typo set the TICRATE to 32 instead of 35. The C sources clearly say it should be 35: linuxdoom-1.10/doomdef.h:#define TICRATE 35

    Wow, I was debugging for so long why I only see 35 FPS in the browser. I was blaming a bad interaction between the 60 FPS the browser renders animations frames vs. the 35 FPS doom likes, which are not a multiple of each other. After 12 browser frames and 7 doom frames (at 200ms), both are in sync again.

    Here is the python script to simulate how late a doom frame will be:

    pdf = 0 # previous doom frame for browser_frame in range(12+1): time = browser_frame1/601000 #ms print(f"Broser frame {browser_frame} at {time:.2f} ms") pending_doom_frame = 1/35*1000 * pdf # ms if pending_doom_frame <= time: print(f" new doom frame for {pending_doom_frame:.2f}; delayed for {time-pending_doom_frame:.2f} ms") pdf += 1

    Output: Broser frame 0 at 0.00 ms new doom frame for 0.00; delayed for 0.00 ms Broser frame 1 at 16.67 ms Broser frame 2 at 33.33 ms new doom frame for 28.57; delayed for 4.76 ms Broser frame 3 at 50.00 ms Broser frame 4 at 66.67 ms new doom frame for 57.14; delayed for 9.52 ms Broser frame 5 at 83.33 ms Broser frame 6 at 100.00 ms new doom frame for 85.71; delayed for 14.29 ms Broser frame 7 at 116.67 ms new doom frame for 114.29; delayed for 2.38 ms Broser frame 8 at 133.33 ms Broser frame 9 at 150.00 ms new doom frame for 142.86; delayed for 7.14 ms Broser frame 10 at 166.67 ms Broser frame 11 at 183.33 ms new doom frame for 171.43; delayed for 11.90 ms Broser frame 12 at 200.00 ms new doom frame for 200.00; delayed for 0.00 ms

    This means, a doom frame is at most displayed 14.29 ms too late. This seems okayish to me for now.

    Simply fixing the typo is good enough for me.

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