Update CMake to specify FXC.EXE to use (#470)

CMakeLists.txt

@@ -61,6 +61,7 @@ elseif(WINDOWS_STORE)
 endif()
 
 include(GNUInstallDirs)
+include(build/CompilerAndLinker.cmake)
 
 #--- Library
 set(LIBRARY_HEADERS
@@ -224,12 +225,19 @@ else()
 endif()
 
 if(NOT USE_PREBUILT_SHADERS)
+    if(BUILD_XBOXONE_SHADERS)
+    else()
+        find_program(DIRECTX_FXC_TOOL FXC.EXE
+          HINTS "C:/Program Files (x86)/Windows Kits/10/bin/${CMAKE_SYSTEM_VERSION}/${DIRECTX_HOST_ARCH}"
+                "C:/Program Files (x86)/Windows Kits/10/bin/${CMAKE_VS_WINDOWS_TARGET_PLATFORM_VERSION}/${DIRECTX_HOST_ARCH}")
+        message(STATUS "Using LegacyShaderCompiler found in ${DIRECTX_FXC_TOOL}")
+    endif()
     add_custom_command(
         OUTPUT "${COMPILED_SHADERS}/SpriteEffect_SpriteVertexShader.inc"
         MAIN_DEPENDENCY "${PROJECT_SOURCE_DIR}/Src/Shaders/CompileShaders.cmd"
         DEPENDS ${SHADER_SOURCES}
         COMMENT "Generating HLSL shaders..."
-        COMMAND ${CMAKE_COMMAND} -E env CompileShadersOutput="${COMPILED_SHADERS}" CompileShaders.cmd ARGS ${ShaderOpts} > "${COMPILED_SHADERS}/compileshaders.log"
+        COMMAND ${CMAKE_COMMAND} -E env CompileShadersOutput="${COMPILED_SHADERS}" $<$<BOOL:${DIRECTX_FXC_TOOL}>:LegacyShaderCompiler=${DIRECTX_FXC_TOOL}> CompileShaders.cmd ARGS ${ShaderOpts} > "${COMPILED_SHADERS}/compileshaders.log"
         WORKING_DIRECTORY "${PROJECT_SOURCE_DIR}/Src/Shaders"
         USES_TERMINAL)
 endif()
@@ -387,8 +395,6 @@ if(MSVC)
     endif()
 endif()
 
-include(build/CompilerAndLinker.cmake)
-
 foreach(t IN LISTS TOOL_EXES ITEMS ${PROJECT_NAME})
   target_compile_definitions(${t} PRIVATE ${COMPILER_DEFINES})
   target_compile_options(${t} PRIVATE ${COMPILER_SWITCHES})

Src/Shaders/CompileShaders.cmd

@@ -32,6 +32,7 @@ goto continue
 
 :continuepc
 
+if defined LegacyShaderCompiler goto fxcviaenv
 set PCFXC="%WindowsSdkVerBinPath%%FXCARCH%\fxc.exe"
 if exist %PCFXC% goto continue
 set PCFXC="%WindowsSdkBinPath%%WindowsSDKVersion%\%FXCARCH%\fxc.exe"
@@ -40,6 +41,12 @@ set PCFXC="%WindowsSdkDir%bin\%WindowsSDKVersion%\%FXCARCH%\fxc.exe"
 if exist %PCFXC% goto continue
 
 set PCFXC=fxc.exe
+goto continue
+
+:fxcviaenv
+set PCFXC="%LegacyShaderCompiler%"
+if not exist %PCFXC% goto needfxc
+goto continue
 
 :continue
 if not defined CompileShadersOutput set CompileShadersOutput=Compiled
@@ -329,6 +336,11 @@ echo %fxc%
 %fxc% || set error=1
 exit /b
 
+:needfxc
+echo ERROR: CompileShaders requires FXC.EXE
+exit /b 1
+
 :needxdk
 echo ERROR: CompileShaders xbox requires the Microsoft Xbox One XDK
 echo        (try re-running from the XDK Command Prompt)
+exit /b 1

build/CompilerAndLinker.cmake

@@ -32,6 +32,13 @@ elseif(CMAKE_VS_PLATFORM_NAME_DEFAULT MATCHES "^[Aa][Rr][Mm]64EC$")
     set(DIRECTX_ARCH arm64ec)
 endif()
 
+#--- Determines host architecture
+if(CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "[Aa][Rr][Mm]64|aarch64|arm64")
+    set(DIRECTX_HOST_ARCH arm64)
+else()
+    set(DIRECTX_HOST_ARCH x64)
+endif()
+
 #--- Build with Unicode Win32 APIs per "UTF-8 Everywhere"
 if(WIN32)
   list(APPEND COMPILER_DEFINES _UNICODE UNICODE)

build/DirectXTK-GitHub-Dev17.yml

@@ -21,6 +21,7 @@ pr:
   paths:
     include:
     - build/DirectXTK-GitHub-Dev17.yml
+    - Src/Shaders/CompileShaders.cmd
 
 resources:
   repositories:

build/DirectXTK-GitHub-GDK-Dev17.yml

@@ -25,6 +25,7 @@ pr:
     - build/*.in
     - build/*.cmake
     - build/SetupBWOI.*
+    - Src/Shaders/CompileShaders.cmd
 
 resources:
   repositories:

build/DirectXTK-GitHub.yml

@@ -21,6 +21,7 @@ pr:
   paths:
     include:
     - build/DirectXTK-GitHub.yml
+    - Src/Shaders/CompileShaders.cmd
 
 resources:
   repositories: