Weird rendering hiccups in 4.8.0

[DrPyspy]

Hello! I updated to v4.8.0 just now and I started encountering these strange rendering mishaps, and I'm not sure what to call them. They seem to only appear when I run the Vulkan renderer. Some issues include:

• Wipe effect 'bleeding' across the screen, similar to a Hall of Mirrors effect
• Random wipe lines jumping up the screen before disappearing
• Font characters' vertices jumping across the screen
• 0:07 of the below video

I first noticed them when I was working on fixing my mod, but I found out that they appear regardless of what I have loaded (or lack thereof.) I have a video showcasing their devious presence:



I do not encounter these things when going back to previous GZDoom versions. My graphics card is a Radeon RX 460.

[Rachael]

Does it still happen with a recent devbuild? There've been a lot of vulkan fixes.

Does not happen on current git (g4.9pre-76-g9a083d2d13) with my Radeon Vega 3.

[DrPyspy]

I attempted running g4.9pre-76-g9a083d2d1 and unfortunately ran into the same issues. I can't seem to find a build for g4.9pre-76-g9a083d2d13, so I am unable to check it.

[Rachael]

What Radeon driver version are you using and what OS?

[DrPyspy]

Here's a list of stuff copied from the software:

GPU - Radeon(TM) RX 460 Graphics - Primary/Discrete
VRAM - 4096 MB - GDDR5 1750 MHz
Software Version - 2021.1021.1449.26678
Driver Version - 21.30.23.04-211216a-376209C
Provider - Advanced Micro Devices, Inc.
2D Driver Version - 8.1.1.1634
Direct3D® Version - 9.14.10.01510
OpenGL® Version - 29.20.11000.14761
AMD Audio Driver Version - 10.0.1.12
Vulkan™ Driver Version - 2.0.198
Vulkan™ API Version - 1.2.188
Windows Version - Windows 10 (64 bit)

The software hasn't been volunteering information about any recent driver updates, so I can't be sure if I am out of date or not, unfortunately.

[dpJudas]

Does this also happen with 4.8.1?

[DrPyspy]

The issues still persist for me in 4.8.1.

[Rachael]

Can someone experiencing this issue post their full config file for me, please? (You can find-replace your name out, I don't care, I just need the settings)

I dug out my RX 550 and am still not experiencing problems.

[dpJudas]

Based on the video it looks like some kind race condition between the shader that outputs to a texture and the shader that uses that same texture for sampling. This either implies a driver bug or wrong flags used for the pipeline barriers between the stages. It could also indicate hardware failure.

Sadly it requires me to start over reading a better source for explaining the pipeline barriers than this horror to really decide if its an error in how I wrote the barriers. That isn't very fun so it may take a while until I get around to it.

[Guest]

The graphical issues here on this forum happens to me on anything above V4.7.1. I was having sound issues as well with disappearing weapon sounds and looping sounds, but that has been resolved in V4.8.2.

My Computer Specs Are As Follows:
Windows 7 Ultimate SP1
Mobo: GA-970A-D3P (Rev 1.0)
CPU: AMD FX 8350 8 Core (4000Mhz - 4200Mhz)
Memory: 16GB
Video: Gigabyte Radeon RX 580 8GB
Sound: Sound Blaster Audigy
SSD's: 2X Samsung EVO 860's 500GB
Power: Corsair 1000W
CD/DVD: DVD ROM, CD/DVD Writer