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Alex Niva

Enabling Metal Compute prevented Affinity Photo from launching

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Affinity Photo version 1.6.11

Running macOS Mojave version 10.14.2 on a 15-inch 2017 MacBook Pro, Graphics Radeon Pro 560 4096 MB / Intel HD Graphics 630 1536 MB

After enabling metal compute acceleration in AfPhoto's options the program was no longer able to launch and the following error was printed repeatedly in the Console app: 

From /Applications/Affinity Photo.app/Contents/MacOS/Affinity Photo (/Applications/Affinity Photo.app/Contents/Frameworks/liblibraster.dylib)



Error Domain=MTLLibraryErrorDomain Code=3 "Compilation failed: 


program_source:1147:11: error: no matching function for call to 'min'

                        return min(args..., args...);


program_source:1948:19: note: in instantiation of function template specialization 'min<unsigned int>' requested here

            loc = min(mask_height*mask_width-1,loc);


/System/Library/PrivateFrameworks/GPUCompiler.framework/Versions/3902/Libraries/lib/clang/902.2/include/metal/metal_integer_math:163:15: note: candidate function template not viable: requires 2 arguments, but 0 were provided

METAL_FUNC _O min(T x, U y)


program_source:1144:4: note: candidate function template not viable: requires at least 2 arguments, but 0 were provided

        T min(T val1, T val2, Args... args)


program_source:378:21: note: candidate function not viable: requires 2 arguments, but 0 were provided

        inline cmykaf_type min(cmykaf_type lhs, cmykaf_type rhs)



I've attached the metal_integer_math file that is referenced in the error. 

Solutions attempted without success:

  • Computer restart.
  • Loading application from backup.
  • Re-downloading the application.

I discovered that the program would became responsive for a couple of seconds after very long intervals and I was eventually able to disable the metal compute acceleration option during one of these brief moments of responsiveness. The program had to be force-quit but functioned as normal when relaunched.

I am hesitant to try to recreate this problem as the solution was a bit iffy.


Screen Shot 2019-01-29 at 12.34.51 AM.png

Screen Shot 2019-01-29 at 1.37.59 AM.png

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Hi Alex Niva,
Welcome to Affinity Forums :)
Can you please try the latest Beta from here: Affinity Photo Customer Beta ( and check if you still have issues with the program? There was a few changes regarding Metal compute acceleration in v1.7. Keep the current retail version installed since it's needed to validate the Beta. Thanks.

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