fix builtin global accessors for instance mode in strands shaders

[aashu2006]

Resolves #8877

Changes:

Fixed installBuiltinGlobalAccessors in strands_api.js so that the builtin globals like mouseX and width work correctly in instance mode when used inside strands shader callbacks.

Previously only window.mouseX was intercepted, so in instance mode (p.mouseX), the values got hardcoded into the shader instead of becoming live uniforms.

Now the function also installs property interceptors on p5.prototype and p5.Graphics.prototype. It correctly handles both data properties (like mouseX) and getter based properties (like width, which delegates to this._renderer?.width) by saving the original property descriptor and delegating to it when strands isn't active.

Also I've added a unit test that verifies myp5.mouseX and myp5.width return strands nodes inside hooks and normal numbers outside.

PR Checklist

• npm run lint passes
• [Inline reference] is included / updated
• [Unit tests] are included / updated

[p5-bot]

Continuous Release

CDN link

• https://raw.esm.sh/pr/p5@20e3b14/lib/p5.min.js

Published Packages

• https://pkg.pr.new/p5@20e3b14

Commit hash: 94fb7b6

Previous deployments

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This is an automated message.

[eupthere]

I think we need to check _isGlobal here, to avoid adding accessors to the global window object on instance mode.

[aashu2006]

thanks for catching it @eupthere, I've added the _isGlobal check so we only define window accessors in global mode now. Also updated the tests to use instance access (myp5.width instead of window.width) since the test framework runs in instance mode anyway.

[davepagurek]

Is there a reason for using a symbol here as opposed to a string?

[aashu2006]

Using a symbol here to avoid any chance of colliding with existing properties on the instance/prototype. A string like _strands_mouseX would also work, but symbols are guaranteed to be unique and stay out of things like Object.keys() and for...in, so the backing store remains hidden.

happy to switch to strings if you think that's simpler 🙂

[davepagurek]

nice!

[aashu2006]

Hi @davepagurek , I added the _isGlobal check so the window accessors are only defined in global mode. Also updated the tests to use instance access (myp5.width) instead of window.width, since the test environment runs in instance mode anyway.

The full test suite is passing now.