Web Platform: WebGL performance warnings in Playground 3D view

[livepeer-tessa]

Description

The Playground 3D view triggers WebGL performance warnings about GPU stalls due to ReadPixels operations.

Steps to Reproduce

1. Go to https://app.daydream.live/playground
2. Start the playground with 3D input mode
3. Open browser DevTools → Console
4. Observe warnings: [.WebGL-...]GL Driver Message (OpenGL, Performance, GL_CLOSE_PATH_NV, High): GPU stall due to ReadPixels

Expected Behavior

3D rendering should not cause GPU stalls or console warnings.

Actual Behavior

Multiple WebGL performance warnings appear, indicating the ReadPixels call is blocking the GPU.

Technical Notes

• Warning: "GPU stall due to ReadPixels"
• This is a performance issue, not a functional bug
• May affect smoothness on lower-end hardware
• Consider using async pixel readback or reducing readback frequency

Environment

• URL: app.daydream.live/playground
• Tested with Chromium 128 headless
• Found during browser testing on 2026-02-20

[livepeer-tessa]

Closing - this issue was found on the web playground (app.daydream.live), not the desktop app. PR #510 fixed desktop app code but doesn't address the original problem.