Rendering before main pass

[aleqdev]

Bevy version

0.11.2

Relevant system information

cargo --version:

cargo 1.71.1 (7f1d04c00 2023-07-29)

uname -a:

Linux 6.1.44-1-MANJARO #1 SMP PREEMPT_DYNAMIC Wed Aug  9 09:02:26 UTC 2023 x86_64 GNU/Linux

AdapterInfo { name: "NVIDIA GeForce GTX 650", vendor: 4318, device: 4038, device_type: DiscreteGpu, driver: "NVIDIA", driver_info: "470.199.02", backend: Vulkan }

SystemInfo { os: "Linux 23.0.0 Manjaro Linux", kernel: "6.1.44-1-MANJARO", cpu: "AMD Ryzen 5 1600 Six-Core Processor", core_count: "6", memory: "7.7 GiB" }

What you did

I want to set gradient as background color. So i made render node and inserted it between PREPASS and BEGIN_MAIN_PASS. I also set camera clear config to None. I expected my shader to generate gradient and after that camera won't clear color and draw meshes on top of it. But it is not the case: color is black.

Then i searched for the workaround. I added another camera thet renders just the gradient and set it's priority to -1. Doesn't work also.

But then i set camera's clear color config to Color::WHITE and now it sometimes shows gradient and sometimes shows white color. I couldn't find a way to resolve this inconsistency.

code: https://github.com/necromfox/bevy_before_main_pass

What went wrong

Expected main pass to preserve color written before it if camera render config set to None. Instead it does not.

Additional information

I found that bevy used to have ClearPass one day, but i couldn't find it in the present.

Screenshots

№1: clear color config set to None

№2: clear color config set to Color::WHITE, sometimes it works...:

№3: clear color config set to Color::WHITE, ...and sometimes it does not:

Also white background appears often than gradient background

[termisaal]

skill issue

[alice-i-cecile]

But then i set camera's clear color config to Color::WHITE and now it sometimes shows gradient and sometimes shows white color. I couldn't find a way to resolve this inconsistency.

Do you mean that this behavior varies between runs of the app? If so, I suspect this is a system order ambiguity bug.

[aleqdev]

Yes, it varies between runs. If it is system order bug, then is must be internal to the engine, because in my example i have only one startup system

[alice-i-cecile]

Yep, I suspect this is related to #9511 then. I know @superdump just refactored the render schedule on main: perhaps he'll have insight here.

[cart]

I've blocked @termisaal from participating in bevy repos. Unacceptable behavior.