Glitch occurs when trying to view glTF files on certain GPUs

[cx20]

I tried to display the following sample in a different GPU environment.
https://cx20.github.io/webgl-test/examples/filament/complex/index.html

Oddly enough, some environments can display correctly and some do not.
Is this a GPU issue? Or is it a library issue?

[OK] Windows 10 + Chrome 89 + Filament v1.9.16 + GeForce GTX 660 result:

[NG] Windows 10 + Chrome 89 + Filament v1.9.16 + GeForce RTX 2060 result:

[romainguy]

I can try on my RTX 3090 later, but it's probably a driver bug we're running into.

[romainguy]

Windows 10 + Chrome 88 + RTX 3090, a similar bug happens at first but as soon as the T-Rex model finishes loading, everything looks fine.

[cx20]

In my Chrome 10 + RTX 2060 environment, Glitch doesn't seem to improve even if T-Rex has finished loading.

BTW, it may not be relevant, but when I display this sample page in Firefox 86, it seems that the following error is displayed on the console.

filament.wasm:413982:1
Uncaught RuntimeError: index out of bounds
    dynCall_viiif https://cx20.github.io/gltf-test/libs/filament/v1.9.16/filament.js:9
    dynCall_viiif_774 https://cx20.github.io/gltf-test/libs/filament/v1.9.16/filament.js line 9 > Function:4
    gltfio$Animator$applyAnimation https://cx20.github.io/gltf-test/libs/filament/v1.9.16/filament.js line 9 > Function:10
    render https://cx20.github.io/webgl-test/examples/filament/complex/index.js:140

​

[cx20]

I found an error in my sample program. Setting the Clear Options in the renderer solved the glitching problem.
cx20/webgl-test@b2397ef

[cx20]

I have tried some official Filament samples on Chrome 89 + RTX 2060.
Perhaps the reason the Triangle tutorial doesn't glitch is because setClearOptions is called.
I think the reason why the knotess sample does not have any problems is probably because the version of Filament is old.

OK/NG	Sample name	result
OK	tutorials/Triangle Tutorial
NG	tutorials/Redball Tutorial
NG	tutorials/Suzanne Tutorial
NG	demos/parquet
NG	demos/suzanne
NG	demos/helmet
OK	demos/knotess

[cx20]

Probably the same problem as #3151.

[romainguy]

@pixelflinger @prideout These demos don't need to clear the color buffer but I wonder if we have a bug with clearing the depth buffer? It's likely related to framegraph2.