Vulkan: Enabling MSAA with SSAO causes artifacts to appear on AMD Polaris GPUs

[ZeroTheOtaku]

Godot version

4.0 Alpha 7

System information

Windows 10, Radeon RX560, GLES3/Vulkan

Issue description

MSAA Causing blocks to appear on screen when moving camera and in gameplay
Tried enabling SSAA and still have same problem.

The problem occurs when SSAO is enabled in the world environment and MSAA is enabled

Steps to reproduce

Set MSAA to 4x
Use a World Environment node
Enable SSAO
Move camera/view around till problem occurs (mainly happens when pointing on a top angle view onto objects)

Minimal reproduction project

MSAA Problem.zip

[Calinou]

4.0

Please specify the exact version you're using (i.e. which alpha or commit hash), as 4.0 stable isn't released yet.

[ZeroTheOtaku]

Alpha 7

[SmartySmart702]

I tried it with Godot alpha 7 and 8 and I could not reproduce the bug.
Win 10, GTX 1070.

[Matzerath]

I can recreate this problem exactly, I am currently using Godot 4.0 beta 10, graphics card is a RadeonRX 580. With MSAA on at 4X, turning on SSAO causes artifacts when moving around, artifacts are gone when SSAO turned off. Problem shows up in an external Godot game I downloaded from Itch.io as well, 'Limspace'. Limspace does not have an option to turn SSAO on/off, I'm assuming that it is on.

[Calinou]

I can't reproduce this on 4.0.beta f692b47 (Linux, AMD Radeon RX 6900 XT, Mesa RADV). This could be an issue specific to Polaris GPUs (and maybe also scoped to Windows).

Updated MRP to work with recent 4.0 betas: MSAA Problem2.zip