Hi,
I’m testing Unity’s Spaceship HDRP demo on iPhone 17 Pro Max and iPad Pro M4 (iOS 26.1).
Everything renders correctly, and my custom MetalFX Spatial plugin initializes successfully — it briefly reports active scaling (e.g. 1434×660 → 2868×1320 at 50% scaling), then reverts to native rendering a few frames later.
Setup:
- Xcode 16.1 (targeting iOS 18)
- Unity 2022.3.62f3 (HDRP)
- Metal backend
- Dynamic Resolution enabled in HDRP assets and cameras
Relevant Xcode console excerpt:
[MetalFXPlugin] MetalFX_Enable(True) called.
[SpaceshipOptions] MetalFX enabled with HDRP dynamic resolution integration.
[SpaceshipOptions] Disabled TAA for MetalFX Spatial.
[SpaceshipOptions] Created runtime RenderTexture: 1434x660
[MetalFX] Spatial scaler created (1434x660 → 2868x1320).
[MetalFX] Processed frame with scaler.
[MetalFXPlugin] Sent RenderTexture (1434x660) to MetalFX. Output target 2868x1320.
[SpaceshipOptions] MetalFX target set: 1434x660
[SpaceshipOptions] Camera targetTexture cleared after MetalFX handoff.
It looks like HDRP clears the camera’s target texture right after MetalFX submits the frame, which causes it to revert to native rendering.
Is there a recommended way to persist or rebind the MetalFX output texture when using HDRP on iOS?
Unity doesn’t appear to support MetalFX in the Editor either:
Thanks!