I write iOS plug in to integrate MetalFX Spatial Upscaling to Unity URP project. C# Code in Unity: namespace UnityEngine.Rendering.Universal { /// /// Renders the post-processing effect stack. /// internal class PostProcessPass : ScriptableRenderPass { RenderTexture _dstRT = null; [DllImport ("__Internal")] private static extern void MetalFX_SpatialScaling (IntPtr srcTexture, IntPtr dstTexture, IntPtr outTexture); } } void RenderFinalPass(CommandBuffer cmd, ref RenderingData renderingData) { // ...... case ImageUpscalingFilter.MetalFX: { var upscaleRtDesc = tempRtDesc; upscaleRtDesc.width = cameraData.pixelWidth; upscaleRtDesc.height = cameraData.pixelHeight; RenderingUtils.ReAllocateIfNeeded(ref m_UpscaledTarget, upscaleRtDesc, FilterMode.Point, TextureWrapMode.Clamp, name: "_UpscaledTexture"); var metalfxInputSize = new Vector2(cameraData.cameraTargetDescriptor.width, cameraData.cameraTargetDescriptor.height); if (_dstRT == null) { _dstRT = new RenderTexture(upscaleRtDesc.width, upscaleRtDesc.height, 0, RenderTextureFormat.ARGB32); _dstRT.Create(); } // call native plugin cmd.SetRenderTarget(m_UpscaledTarget, RenderBufferLoadAction.DontCare, RenderBufferStoreAction.Store, RenderBufferLoadAction.DontCare, RenderBufferStoreAction.DontCare); MetalFX_SpatialScaling(sourceTex.rt.GetNativeTexturePtr(), m_UpscaledTarget.rt.GetNativeTexturePtr(), _dstRT.GetNativeTexturePtr()); Graphics.CopyTexture(_dstRT, m_UpscaledTarget.rt); sourceTex = m_UpscaledTarget; PostProcessUtils.SetSourceSize(cmd, upscaleRtDesc); break; } // ..... } Objective-c Code in iOS: head file: #import <Foundation/Foundation.h> #import <MetalFX/MTLFXSpatialScaler.h> @protocol MTLTexture; @protocol MTLDevice; API_AVAILABLE(ios(16.0)) @interface MetalFXDelegate : NSObject { int mode; id _device; id _commandQueue; id _outTexture; id _mfxSpatialScaler; id _mfxSpatialEncoder; }; (void)SpatialScaling: (MTLTextureRef) srcTexture dstTexure: (MTLTextureRef) dstTexture outTexure: (MTLTextureRef) outTexture; (void)saveTexturePNG: (MTLTextureRef) texture url: (CFURLRef) url; @end m file: #import "MetalFXOC.h" @implementation MetalFXDelegate (id)init { self = [super init]; return self; } static MetalFXDelegate* delegateObject = nil; (void)SpatialScaling: (MTLTextureRef) srcTexture dstTexture: (MTLTextureRef) dstTexture outTexture: (MTLTextureRef) outTexture { int width = (int)srcTexture.width; int height = (int)srcTexture.height; int dstWidth = (int)dstTexture.width; int dstHeight = (int)dstTexture.height; if (_mfxSpatialScaler == nil) { MTLFXSpatialScalerDescriptor* desc; desc = [[MTLFXSpatialScalerDescriptor alloc]init]; desc.inputWidth = width; desc.inputHeight = height; desc.outputWidth = dstWidth; ///_screenWidth desc.outputHeight = dstHeight; ///_screenHeight desc.colorTextureFormat = srcTexture.pixelFormat; desc.outputTextureFormat = dstTexture.pixelFormat; if (@available(iOS 16.0, *)) { desc.colorProcessingMode = MTLFXSpatialScalerColorProcessingModePerceptual; } else { // Fallback on earlier versions } _device = MTLCreateSystemDefaultDevice(); _mfxSpatialScaler = [desc newSpatialScalerWithDevice:_device]; if (_mfxSpatialScaler == nil) { return; } _commandQueue = [_device newCommandQueue]; MTLTextureDescriptor *texdesc = [[MTLTextureDescriptor alloc] init]; texdesc.width = (int)dstTexture.width; texdesc.height = (int)dstTexture.height; texdesc.storageMode = MTLStorageModePrivate; texdesc.usage = MTLTextureUsageRenderTarget | MTLTextureUsageShaderRead | MTLTextureUsageShaderWrite; texdesc.pixelFormat = dstTexture.pixelFormat; _outTexture = [_device newTextureWithDescriptor:texdesc]; } id upscaleCommandBuffer = [_commandQueue commandBuffer]; upscaleCommandBuffer.label = @"Upscale Command Buffer"; _mfxSpatialScaler.colorTexture = srcTexture; _mfxSpatialScaler.outputTexture = _outTexture; [_mfxSpatialScaler encodeToCommandBuffer:upscaleCommandBuffer]; // outTexture = _outTexture; id textureCommandBuffer = [_commandQueue commandBuffer]; id _mfxSpatialEncoder =[textureCommandBuffer blitCommandEncoder]; [_mfxSpatialEncoder copyFromTexture:_outTexture toTexture:outTexture]; [_mfxSpatialEncoder endEncoding]; [upscaleCommandBuffer commit]; } @end extern "C" { void MetalFX_SpatialScaling(void* srcTexturePtr, void* dstTexturePtr, void* outTexturePtr) { if (delegateObject == nil) { if (@available(iOS 16.0, *)) { delegateObject = [[MetalFXDelegate alloc] init]; } else { // Fallback on earlier versions } } if (srcTexturePtr == nil || dstTexturePtr == nil || outTexturePtr == nil) { return; } id<MTLTexture> srcTexture = (__bridge id<MTLTexture>)(void *)srcTexturePtr; id<MTLTexture> dstTexture = (__bridge id<MTLTexture>)(void *)dstTexturePtr; id<MTLTexture> outTexture = (__bridge id<MTLTexture>)(void *)outTexturePtr; if (@available(iOS 16.0, *)) { [delegateObject SpatialScaling: srcTexture dstTexture: dstTexture outTexture: outTexture]; } else { // Fallback on earlier versions } return; } } With the C# and objective code, the appear on screen is black. If I save the MTLTexture to PNG in ios plug in, the PNG is ok(not black), so I think the outTexture: outTexture write to unity is failed.

I have tested SpatialUpsacling with a Unity URP sample project: https://github.com/mao-test-h/MetalFXSamples. I used iPhone 13 with iOS Beta 7. The performance and quality are both worse than Native.

I use Macmini with MacOS Ventura 13.3.1, while the Mac running MetalFX sample code, and choose Temporal Scaler, makeTemporalScaler return nil value, and print "The temporal scaler effect is not usable!". If i choose SpatialScaler, it is ok. guard let temporalScaler = desc.makeTemporalScaler(device: device) else { print("The temporal scaler effect is not usable!") mfxScalingMode = .defaultScaling return } Sample code: https://developer.apple.com/documentation/metalfx/applying_temporal_antialiasing_and_upscaling_using_metalfx?language=objc