Scanlines/fickering tilemap on NVIDIA laptop (Moiré patterns due to mipmap aliasing)

[Xarcaneo]

Godot version

Godot_v3.3.3-stable_win64

System information

Windows 10, GLES 3, INTEL(R) Core i7-7820HK CPU @ 2.90Ghz 8CPUs

Issue description

So I will appreciate any help because that project is important to me. I am making a game with 2D tilemaps but I have some problems with graphic glitches, I recorded video for you:
Glitch example 1
And also moved my tilemap to another project and there is the same problem, even in editor:
Glitch example 2

Pixel snap is on, filtering off, camera process mode set to physic, vsync on, I tried to switch from GLES3 to 2 but there is the same problem, I turned Nvidia rect ficker workaround but it doesnt help. I have no idea how to fix that. I tried GODOT 3.3.3 and 3.4

Steps to reproduce

Put the tilemap and player with camera then run the game and enjoy flicker.

Minimal reproduction project

No response

[clayjohn]

Do the textures have mipmapping enabled? In the video, the artifacts look like mipmap artifacts from using mipmaps on a texture atlas.

[Xarcaneo]

No, Ill show you settings for all my textures in project:

[lawnjelly]

Not absolutely sure, aside from mipmapping as clayjohn says it could also possibly just be aliasing? (especially if filtering is off)
https://en.wikipedia.org/wiki/Aliasing

This will occur when the source texels do not match up to a regular number of pixels on screen, especially when filtering is off, and is especially noticeable in some textures.

[Xarcaneo]

So what should I try to do?

[Calinou]

You most likely need to enable Mipmaps to avoid visible Moiré patterns when the texture is not displayed at a 1:1 scale.

[Xarcaneo]

Moiré patterns still visible with mipmaps enabled, I have to try to open project in another laptop and check if there is also this problem. Do you have any other suggestions?

[Calinou]

@Xarcaneo Please upload a minimal reproduction project to make this easier to troubleshoot.

[Xarcaneo]

reproduction.zip
Simple reproduction. Slower character movement == more visible effect. Effect only visible with camera on.

[lawnjelly]

Yes it looks like aliasing between the viewport size (lower resolution rendered surface), and stretching it to fit on a fractionally scaled window. If you set the test window size to e.g. 960x640 (i.e. double the original) you don't get the problem, or presumably with other multiples 1:1, 2:1, 3:1 etc.

[Xarcaneo]

That's right, there is no Moiré patterns when I set that test windows size 960x640, but there are still visible gaps between tiles while e.g. jumping. For window size 1440x960 there are visible aliasing again, and I still have no idea how to make that project be able to resize to fullscreen on all PC devices without aliasing,.

[Calinou]

For the record, this issue was cross-posted on the Godot forums: https://godotforums.org/discussion/28093/weird-graphic-behavior-in-pixelart-platformer

[Xarcaneo]

Solution:
So I didn't give up and tried to figure it out what is going on so simply you was right, there is scaling on but no in the editor. I use Win10 that has scaling on by default in display settings 125%. When I changed it to 100 Moiré patterns disappeared. I wasn't satisfied by this solution because we can't force players to change scale of display when they play specific games so I found a setting Allow Hidpi and enabled it, now it work good even on scaled display. I also changed viewport to 640x360 and it also helped a lot coz can be easly multiplied to 1920x1080. For now I have only problem with flicker while camera is moving, it is not noticeable on video when I tried to record that and also tiles get blurry, if you guys gave any solution for that Ill appreciate.

[Calinou]

Closing per the above comment. Enabling Allow Hidpi by default was rejected in the past, but it may be considered again now that built-in 3D resolution scaling is available.

We have no control over how Windows does its hiDPI scaling – only whether it's enabled (non-DPI-aware app) or not (DPI-aware app). Whether it chooses nearest-neighbor or linear scaling is something Windows does on its own.