目录
  1. 1. Windows Metal Shader Compiler for IOS
  2. 2. Loaded a text shader (will be slower to load)
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lipengzha
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IOS Metal Shader 编译

Windows Metal Shader Compiler for IOS

在 4.26 及更高的引擎版本中，支持在 Windows 上直接安装 Metal Sahder Compiler 来支持在 Windows 上编译 Metal 的 Shader，只需要在 Apple 开发者网站 上安装 Metal Developer Tools for Windows 工具安装即可。

4.26 引擎执行 Cook 时的 Log，可以看到创建了 Metallib：

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Running: C:\Program Files\Epic Games\UE_4.26\Engine\Binaries\Win64\UE4Editor-Cmd.exe "C:\Users\lipengzha\Documents\Unreal Projects\StarterContent426\StarterContent426.uproject" -run=Cook  -TargetPlatform=IOS -fileopenlog -ddc=InstalledDerivedDataBackendGraph -unversioned -abslog="C:\Program Files\Epic Games\UE_4.26\Engine\Programs
\AutomationTool\Saved\Cook-2021.04.08-10.06.40.txt" -stdout -CrashForUAT -unattended -NoLogTimes  -UTF8Output
  LogInit: Display: Running engine for game: StarterContent426
  LogHAL: Display: Platform has ~ 32 GB [34123063296 / 34359738368 / 32], which maps to Largest [LargestMinGB=32, LargerMinGB=12, DefaultMinGB=8, SmallerMinGB=6, SmallestMinGB=0)
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'AllDesktop'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Android'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Android_ASTC'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Android_DXT'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Android_ETC2'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'AndroidClient'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Android_ASTCClient'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Android_DXTClient'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Android_ETC2Client'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Android_Multi'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Android_MultiClient'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'IOSClient'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'IOS'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Linux'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'LinuxNoEditor'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'LinuxClient'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'LinuxServer'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'LinuxAArch64NoEditor'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'LinuxAArch64Client'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'LinuxAArch64Server'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Lumin'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'LuminClient'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'MacNoEditor'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Mac'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'MacClient'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'MacServer'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'TVOSClient'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'TVOS'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'WindowsNoEditor'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'Windows'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'WindowsClient'
  LogTargetPlatformManager: Display: Loaded TargetPlatform 'WindowsServer'
  LogTargetPlatformManager: Display: Building Assets For IOS
  LogAudioDebug: Display: Lib vorbis DLL was dynamically loaded.
  LogShaderCompilers: Display: Using Local Shader Compiler.
  LogDerivedDataCache: Display: Max Cache Size: 512 MB
  LogDerivedDataCache: Display: Loaded Boot cache: C:/Users/lipengzha/AppData/Local/UnrealEngine/4.26/DerivedDataCache/Boot.ddc
  LogDerivedDataCache: Display: Pak cache opened for reading ../../../Engine/DerivedDataCache/Compressed.ddp.
  LogDerivedDataCache: Display: Performance to C:/Users/lipengzha/AppData/Local/UnrealEngine/Common/DerivedDataCache: Latency=0.06ms. RandomReadSpeed=291.68MBs, RandomWriteSpeed=137.99MBs. Assigned SpeedClass 'Local'
  LogMaterial: Display: Missing cached shader map for material Widget3DPassThrough, compiling.
  LogMaterial: Display: Missing cached shader map for material Widget3DPassThrough, compiling.
  LogMaterial: Display: Missing cached shader map for material Widget3DPassThrough, compiling.
  LogMaterial: Display: Missing cached shader map for material Widget3DPassThrough, compiling.
  LogMaterial: Display: Missing cached shader map for material Widget3DPassThrough, compiling.
  LogMaterial: Display: Missing cached shader map for material Widget3DPassThrough, compiling.
  LogMaterial: Display: Missing cached shader map for material DefaultSpriteMaterial, compiling.
  LogAudioCaptureCore: Display: No Audio Capture implementations found. Audio input will be silent.
  LogAudioCaptureCore: Display: No Audio Capture implementations found. Audio input will be silent.
  LogCook: Display: CookSettings for Memory: MemoryMaxUsedVirtual 0MiB, MemoryMaxUsedPhysical 16384MiB, MemoryMinFreeVirtual 0MiB, MemoryMinFreePhysical 1024MiB
  LogCook: Display: Mobile HDR setting 1
  LogCook: Display: Creating asset registry
  LogCook: Display: Discovering localized assets for cultures: en
  LogCook: Display: Unable to read previous cook inisettings for platform IOS invalidating cook
  LogCook: Display: Clearing all cooked content for platform IOS
  LogCook: Display: Sandbox cleanup took 0.025 seconds for platforms IOS
  LogMetalShaderCompiler: Display: Creating Native Library C:/Users/lipengzha/Documents/Unreal Projects/StarterContent426/Saved/Cooked/IOS/StarterContent426/Content/Global_SF_METAL.0.metallib
  LogMetalShaderCompiler: Display: Archiving 685 shaders for shader platform: SF_METAL
  LogZipArchiveWriter: Display: Closing zip file with 0 entries.
  LogMetalShaderCompiler: Display: Post-processing archive for shader platform: SF_METAL
  LogCook: Display: Cooked packages 0 Packages Remain 314 Total 314

打包出来的 Shadercode 不是 ushaderbytecode 文件，而是和 Mac 上打包一致的metallib。

Loaded a text shader (will be slower to load)

当使用远程构建的方式打包了 IOS 包，在运行时会有以下 log：

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LogMetal: Display: Loaded a text shader (will be slower to load)

该日志在以下代码中输出：

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Source\Runtime\Apple\MetalRHI\Private\MetalShaders.cpp
/** Initialization constructor. */
template<typename BaseResourceType, int32 ShaderType>
void TMetalBaseShader<BaseResourceType, ShaderType>::Init(TArrayView<const uint8> InShaderCode, FMetalCodeHeader& Header, mtlpp::Library InLibrary)
{
  // ...
}

这是因为加载的 Shader 需要实时编译，会比较慢，可以在项目设置中为 IOS 开启remote shader compile，在 UE4.26 之后，也可以通过本地安装 metal 的工具链在本地编译 metal 的 shader。