Particle system broken on Samsung Galaxy S10

[CMRDX]

We are currently experiencing that the PlayCanvas particle system behaves incorrectly on specific Samsung devices, namely Galaxy S10, Galaxy S10+ and Galaxy S10e with Android 11 and Chrome 93.0.4577.62

The corresponding Forum post can be found here (including videos and a link to our test project):
https://forum.playcanvas.com/t/particle-system-broken-on-samsung-galaxy-s10/21787

[mvaligursky]

Possibly related to #3415

[yaustar]

FYI: Cannot reproduce on a Galaxy Fold 3

[yaustar]

I couldn't reproduce this on the Browserstack S10+ or any of the Samsung devices in our remote device lab.

Wondering if it's specific to the Exynos CPU and not the Snapdragon variant.

@CMRDX Are your devices the Snapdragon or the Exynos variant?

[CMRDX]

The device seen in the Video (S10e), as well as the S10+ is featuring a Exynos 9820 2.73GHz.

[yaustar]

That may explain why my Fold 3 doesn't have the issue, it's using a Snapdragon 🤔

[leonidaspir]

I've tried it on a Samsung S10 with the same CPU and I am getting the same issue on the project provided on the forum.

[yaustar]

@CMRDX or @leonidaspir Can you try running this with WebGL 1 forced, ie: https://launch.playcanvas.com/1225034?debug=true&webgl1=true

This runs a different code path and will help narrow down the issue.

[leonidaspir]

Works as expected when running with WebGL1.

[CMRDX]

@yaustar We got the same result as @leonidaspir. Seems to work as expected when enforcing WebGL 1.

[yaustar]

Thanks, that helps with extra information/debugging.

We are working on getting a device to replicate the issue.

[yaustar]

Tried on multiple Exynos CPUs #3415 (comment)

No joy in reproducing the issue :(

[marcusx2]

I'm taking the opportunity to report how the particles show up on a Samsung Galaxy S10 I got my hands on.

https://playcanvas.github.io/#/graphics/particles-snow

https://playcanvas.github.io/#/graphics/particles-spark

[yaustar]

Reported not rendering correctly on RedMi 9 Prime device: https://forum.playcanvas.com/t/dat-cube-my-first-game-with-playcanvas-underdev/23757/7?u=yaustar

[yaustar]

Reported not rendering correctly on Xiaomi Note 8 Pro https://forum.playcanvas.com/t/i-have-particlesystem-mobile-problem/23531/3?u=yaustar

[yaustar]

As we think this is a hardware driver issue, we've created a workaround that forces using the CPU on ARM based Samsung devices: #4147

I expect this to go out with engine 1.53

[yaustar]

Looks like this isn't limited to Exynos CPUs but it's related to the GPU used which is Mali based.

See thread: https://forum.playcanvas.com/t/particles-not-rendered-on-amazon-fire-tablet-hd-8/30660

[yaustar]

Closing this as this is no longer reproducible. See PR #5255