Question why URP bans depth copy for all GLES

hi, i m using 2021 with URP now, and find that Copy Depth Option will result Depth PrePass when on android device, upon investigate a bit into UniversalRenderer, i see unity has block depth texture copy if GLES is in used,
coz i used to make seperate depth buffer and copy from that if shader needed it, and it runs fine on all the android devices that were available to me at the time.

so, i would like to know why unity would come to the decision like this ? preventing depth copy for all GLES ?
becoz of performance reason? is it because you guys have to consider MSAA depth copy, no MSAA depth copy is still viable? and invalid result ?

 

Doesn't the comment explain it very clearly? It even points to a place to find more information?

 

wel, were you able to find out more from that point of place on fogbugz? plz do share what you found.
if i was able to inverstigate further from there, and clear my question, i wouldnt have make this post, wood i ?

 

The comment says, "Copying depth on GLES3 is giving invalid results" - so there's a bug in GLES3.

"This won't be fixed by the driver team" - the team who develop GLES3 (not Unity) won't fix it -

"...because it would introduce performance issues" - their reason given is that it would impact perfomance.

So that's why Unity doesn't allow that feature: it doesn't work, because of the decision made by the GLES3 team.

I'm not sure what else there is to "find out". It's not something Unity needs to fix, or can fix.

 

well thx so much for point out the obvious,
1. i used custom depth and copy with Unity2018 for process like motion blur and TAA for high end device, the game is built only with GLES 3 for android, and the game is on the market. and i have tested on all the physical devices that i had at the time, they all work fine, plus, up til now, i havnt received any complaint about having abnormal graphic issue from our game that has been out on the market for about 1.5 years.



2.we also have another WIP game with 2020, which by default (by URP) was doing depth copy on all platform (including GLES 3.0, window at least)

and 2020 does not have depth priming at all, looks like depth copy was their default choice for URP unity


now put your feet in my shoes, do you still think that simply "driver issue, wont fix" would be the answer enough for me?


if depth copy on ES 3 is really an issue, i have no choice but to make the change now for the game with 2020, and for the game with 2018. if that really is some problem major.
but from my personal test and our games' market feedback, i dont see any problem or complaints now.

so once again, i would like to know why unity would come to the decision like this ? preventing depth copy for all GLES ?
becoz of performance reason?
is it because Unity have to consider MSAA depth copy, no MSAA depth copy is still viable?

 

hi ManueleB, is it possible to make an update push for 2021 URP package ? i m using 2021.3.6f.
modifying package cache locally in the library folder seems to be not allowed (upon editor re-compile, the change will be gone).
or is there anyway that local modification can be done ?

cheers

 

If you make a modification to a package you have to put it inside the packagea folder. Then it will override

 

got it, cheers