Unity Issue Tracker - Shader variant build preparation does not scale

Fixed

Fixed in 2021.3.15f1, 2022.2.0b15, 2023.1.0a14

Votes

113

Found in

2021.3.8f1

2022.1.13f1

2022.2.0b4

2023.1.0a6

Issue ID

UUM-3711

Regression

No

Shader variant build preparation does not scale

Jun 06, 2022

When building shaders Unity enumerates through all possible shader variants to be able to strip the excess variants using scriptable stripping. With the amount of multi_compile features increasing in the shaders, the full variant space can grow into sizes where the time and memory requirements to process becomes unbearable.

URP is especially hurt by this due to how much it utilizes multi_compile. Take the URP template project and build it. A significant portion of the time goes into preparing 400M variants, after which we only compile the required ones. Now add a few multi_compiles on top of that and the preparation can take hours.

Resolution Note (fix version 2023.1.0a14):

Added a shader keyword pre-filtering system to avoid enumerating through the full variant space. Utilized by URP only for starters.
This makes the build faster again by avoiding processing millions of variants just to be stripped.
Resolution Note (fix version 2022.2.0b15):

Added a shader keyword pre-filtering system to avoid enumerating through the full variant space. Utilized by URP only for starters.
This makes the build faster again by avoiding processing millions of variants just to be stripped.
Resolution Note (fix version 2021.3.15f1):

Added a shader keyword pre-filtering system to avoid enumerating through the full variant space. Utilized by URP only for starters.
This makes the build faster again by avoiding processing millions of variants just to be stripped.

Comments (21)

tom_opuscope

Sep 21, 2022 09:21

it has been months without a fix, any progress ? We have been stuck on 2021.1 for a while now because of this.
jay-jin

Sep 19, 2022 02:12

Time is money friend!
fwalker

Aug 27, 2022 02:24

This is pretty crazy. We are also in need of a fix.
Bwacky

Aug 23, 2022 21:26

It's incredible how damaging this is to any sort of project with tighter deadlines, yet it's still not fixed after such a ridiculously long time. Simply insane.
czlowiekpiotrus

Aug 10, 2022 08:07

Please fix this ASAP.
KrisDevelopment

Jul 19, 2022 16:27

One of the many problems with SRP. Vote!
matheus_inmotionvr

Jul 19, 2022 07:35

I wish I could give all my votes in one issue.
PiotrSamborowski

Jul 01, 2022 13:30

I was hoping this problem would disappear with the LTS version, but it persists. Building one scene takes me over 40 minutes which is a huge production bottleneck. Please fix as soon as possible, we're unable to get any work done like this.
rafalTylQED

Jun 29, 2022 14:52

This issue completely derails our development process. It's absolutely critical and the LTS version should have never been released in this state.
Blepius

Jun 23, 2022 19:29

This is critical, please vote for this!

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