SSAO is not working with three 0.153.0 on Android:Chrome

[marwie]

Description of the bug

Running the SSAO sample on android chrome doesnt have any SSAO

To Reproduce

1. Pull postprocessing package. I tested with c3ce388

2. Modify hugo startup parameters to start on host ip address (so it can be opened via a phone in the same local network)
   "start": "hugo server -s manual -e development --bind=<your_ipv4> --baseURL=http://<your_ipv4>:1313",

Expected behavior

SSAO being rendered on android

Screenshots

Set intensity to maximum:

Library versions used

• Three: 153
• Post Processing: c3ce388

Mobile

• Device: Pixel 6a
• OS: Android 13
• Browser Chrome 114.0.5735.131

[vanruesc]

The error implies that the DepthDownsamplingMaterial doesn't explicitly define a precision for float arrays. That's strange though, because default precision declarations are usually injected automatically by three. Maybe this has to do with how the arrays are initialized. Does your device support WebGL 2 or does it fall back to WebGL 1?

[marwie]

Yes the Pixel 6a supports webgl 2 (double checked on https://get.webgl.org/webgl2/)

[vanruesc]

This is likely a driver/browser/angle bug because the precision declarations are definitely at the top of the shader.

I've added explicit precision qualifiers to float array declarations in postprocessing@6.32.2. Could you please check if this fixes the issue?

[marwie]

Hi, I just rebased on 6.32.2 and ran npm start but the issue still persists on my phone: no ssao visible

[vanruesc]

I've changed the array initializations in postprocessing@6.33.3. It would be great if you could test again with this update.

[marwie]

Hi @vanruesc I just updated to 6.33.3 and it works there - thank you for the fix

[vanruesc]

Nice, thanks for checking 👍