Screen Tearing at random combining: Fully Buffered and Screen Size 5x Height

[lilo-san]

Describe the bug Screen Tearing at random, particularly visible on the top of the screen. It only happens when combining: Fully Buffered and Screen Size 5x Height Doesn't happen when combining: Fully Buffered and Screen Size 4x Height Doesn't happen when combining: Zero Delay and Screen Size 5x Height

To Reproduce Steps to reproduce the behavior:

1. Toggle setting '...' Buffered Mode - Fully Buffered Screen Size - 5x Height
2. Load ROM '....' Sonic 3D Blast
3. Play through '....' Go around the first level for 1-2 minutes and you should spot a couple of appearances of it. This game scrolls on all directions so is an easy way to reproduce it.
4. See error

Expected behaviour I expect to not have random appearances of screen tearing.

[vanfanel]

Possible the same issue as this:

https://github.com/SmokeMonsterPacks/Mega-Sg-Jailbreak/issues/64

..But no one seems to care about it. I gave the core author visual evidence a year ago.

[PizzaCube]

i am getting this too but was not sure if it was normal for the game since it is so close to the crt overscan area and i just never saw it before. i see it mostly in master system games, not genesis.

[ArkhangelAzrael]

I could perceive this problem quite easily on Aladdin with the default Fully Buffered and Screen Size 5x Height config, but I have noticed that I don't have any screen tearing with Fully Buffered mode if I use the config provided by Firebrandx here: https://drive.google.com/file/d/1jKV9oF7gW2PMf7Slh9iDv8gGhZzvUqXZ/view

Specifically, the 4.9x mode:

-- FirebrandX 4.96(3)x (fullscreen):
* set horizontal pos=65, vertical pos=32
320: 1640x1157 enable BOTH H and V (uncheck boxes)
256: 1497x1157 enable BOTH H and V (uncheck boxes)

I am using 1080p mode as well.

Scanlines don't work very well on that mode, but I have made them work good enough using:

Genesis Core Scanlines: 0 | 37 | 100 - Normal

[hergel]

I have the same issue, as long as I have set to 5x height I can clearly see a screen tear on top of the screen, this goes away if I change to 4.5x height.

[hergel]

My issues went away when i used FirebrandX SMS config:

Set horizontal pos=2, vertical pos=56 1462x1200 enable H, disable V

[spoonmanx]

Looks like it was fixed with the new 4.9 Analogue firmware. https://www.analogue.co/support/mega-sg/firmware/4.9 (2023/05/04] "Fixed screen tearing on SMS"

Now we just need a new JB version. 😉👍

[tjanas]

@lilo-san @spoonmanx Please re-test with JB7.9 and if it is still an issue, open a ticket at https://github.com/analoguejb/Analogue-Mega-Sg-JB