Display problems when using zfast-crt on Android

Hey all,

I’ve successfully installed Retroarch on my Amazon Fire TV Stick 4K. The installed emulators for NES, SNES work perfectly.

However, there is a general display problem when using CRT shaders. The zfast-crt shader serves as an example, but the same display problem also occurs with the crt-pi shader.

As you can see on the images (the red line within of the images is used for marking only) about 40% of the screen (right side of the screen is affected) is noticeably darker than the rest.

This phenomenon also occurs when using crt-pi shader instead of zfast-crt.

Anyone who can help me to solve this problem?

Many thanks! Sebastian

Key data: Amazon Fire TV Stick 4K MediaTek MTK8695+MT7668 4x 1.70GHz, GPU: IIMG GE8300 Android Level 28 (Android 9) OpenGL ES 3.2 Retroarch 1.9.0 1920 x 1080 Both emulator cores affected (Nestopia & Snes9x)

You could try multiplying the TexCoords by 1.0001 here:

I tried RA on the Firestick 4K and this same issue happened to me too. Was never able to remedy it.

A little off topic but do you have bad sound lag along with input lag on your FS4K with RA? It was such a bad experience compared to my pc I immediately deleted it because of all these hiccups.