Polar scalers behave weird with vo=gpu on Android

Important Information

Provide following Information:

• mpv version: mpv v0.37.0-738-gf974382ca0
• Platform and Version: Android 12
• Source of the mpv binary: https://github.com/mpv-android/mpv-android/releases/tag/2024-04-09
• If known which version of mpv introduced the problem: Unknown
• GPU model, driver and version:
  Qualcomm Adreno 650
  OpenGL ES 3.2 V@0530.0 (GIT@4a124bc, I55aa49cfcc, 1622723547) (Date:06/03/21)

Reproduction steps

Output with config
no-config vo=gpu hwdec=no scale=lanczos

Output with config
no-config vo=gpu hwdec=no scale=ewa_lanczos

• Reproducible when including profile=fast options except scale
• Doesn't happen with vo=gpu-next (see below)
• Artifacts not visible on screenshots taken with mpv, but they are visible on screen, and therefore show up when taking screenshot through Android

FWIW, output with config
no-config vo=gpu-next hwdec=no scale=ewa_lanczos

Expected behavior

Polar scalers upscale videos normally on vo=gpu, as they do on vo=gpu-next

Actual behavior

Visual artifacts show up when upscaling videos with polar scalers on vo=gpu

Log file

lanczos.log
ewa_lanczos.log

ewa_lanczos_gpu-next.log

Sample files

https://github.com/mpv-player/mpv/assets/36733368/e72916c0-8838-4330-a89d-781276de300a

Start by reproducing the artifacts with vo=gpu, hwdec=no, and the listed lanczos and ewa_lanczos settings on Android 12. Compare the result with vo=gpu-next using the attached logs and sample file; done means polar scalers upscale normally on vo=gpu without visible screen artifacts.