TR1X bug: First backdrop flicker during fade-in when starting up the game

LostArtefacts / TR1X

Open source re-implementation of Tomb Raider 1 (1996), along with additional enhancements and bugfixes

https://lostartefacts.dev/

GNU General Public License v3.0

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TR1X bug: First backdrop flicker during fade-in when starting up the game #1388

Open aredfan opened 3 months ago

aredfan commented 3 months ago

Dev snapshot: 4.1.2-45-g5d706bd

When starting up the game - the first visible backdrop flickers during fade-in. A sort-of black blink.

I think this regression was introduced today.

Steps to reproduce:

Disable FMVs.
Set FPS to 30 before starting up the game. 60 FPS is affected too but it's hard to tell.
If eidos logo is enabled then that particular backdrop is affected.
If eidos logo is disabled then the main menu backdrop is affected instead.

Edit: The issue happens when vsync is enabled.

rr- commented 3 months ago

@aredfan I can't quite see this, can you show some exaggerated video and post the config file? Thanks.

aredfan commented 3 months ago

@rr- Yes of course, here's my config files: cfg.zip.

Btw I did more investigating today and found that the blink is a lot more apparent when Fade effects is disabled. Maybe the bug isn't related to fades.

My screen-recorder GeForce wasn't able to capture the issue so I recorded it on my phone instead, it's slow motion. See the Eidos screen appear for a frame or two, before properly appearing.

The video is recorded with fades disabled, vsync on, and 30 FPS.

https://github.com/LostArtefacts/TR1X/assets/94776985/73ad9a1d-f94b-43c0-b219-c8f920422a0d

aredfan commented 3 months ago

I thought it might be a good idea to write a short summary of what we know so far.

The first backdrop to appear is affected by this issue. It can be the Eidos screen. If the Eidos screen and FMVs are disabled then the main menu backdrop is affected instead.
- The flickering is noticeable when vsync is on. It's possible the flicker is present when vysnc is off but it's very hard to tell.
When I disable fades, it makes the flicker easier to see.
The flicker only happens in fullscreen and not windowed mode, it happens regardless of render mode.

rr- commented 2 months ago

@aredfan can you check if this build makes any difference?

https://nebula.wind.garden/serve/pub/TR1X-4.1.2-62-gc034908-dirty-Windows.zip

aredfan commented 2 months ago

@rr- I just tested the build and the flicker is still present.