Add a toggle for the experimental WebGPU mode addon

[davepagurek]

Increasing Access

One of the first-party addons we build with p5.js is p5.webgpu.js. This is still experimental, but we're actively looking for people to test it out and give feedback and possibly contribute. In the next p5 version, we will have items in the reference that are exclusively for WebGPU mode. It would be great to give them an easy way to try it out via a toggle like we have for our compatibility addons or p5.sound.

Feature enhancement details

• We should make sure to label it as experimental -- we do want people to test it out, but for the purposes of providing feedback and getting involved, as we expect APIs to change. We want to set the right expectations.
• In the same way we let you link to a specific p5 version via a URL param, could we also let you start with the WebGPU addon enabled via URL param? This would help us be able to link to a starting sketch from the p5 website.
• WebGPU mode also requires using async setup and await createCanvas(w, h, WEBGPU). Possibly overkill, but one could maybe try to change that in the code too.

[aashu2006]

@davepagurek I have a good idea of how to approach it by following the existing addon toggle pattern, can i work on this?

[aashu2006]

my plan is to add a usingWebGPU field to the project schema, inject p5.webgpu.js into the preview iframe when it's on, add the toggle in preferences with an experimental label, and support a URL paramter for linking it from the p5 site. will also make sure it's disabled for 1.x since webgpu mode is 2.x only.

[davepagurek]

I'll wait for @raclim to decide, but one thing I'd offer is that it's not so much about injecting it into the iframe, but injecting a <script> tag into the sketch's index.html. Take a look at the code for the existing addon toggles + version picker, which parse the HTML to check for the existence of script tags and add new ones.

[aashu2006]

got it, will look at how the existing addon toggles handle the script tag parsing and follow the same pattern