Update for recent tool improvements

Texenvmap/Shaders/CompileShaders.cmd

@@ -9,6 +9,7 @@ if %PROCESSOR_ARCHITECTURE%.==ARM64. (set FXCARCH=arm64) else (if %PROCESSOR_ARC
 
 set FXCOPTS=/nologo /WX /Ges /Zi /Zpc /Qstrip_reflect /Qstrip_debug
 
+if defined LegacyShaderCompiler goto fxcviaenv
 set PCFXC="%WindowsSdkVerBinPath%%FXCARCH%\fxc.exe"
 if exist %PCFXC% goto continue
 set PCFXC="%WindowsSdkBinPath%%WindowsSDKVersion%\%FXCARCH%\fxc.exe"
@@ -17,6 +18,12 @@ 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
@@ -42,8 +49,12 @@ endlocal
 exit /b 0
 
 :CompileShader
-set fxc=%PCFXC% %1.fx %FXCOPTS% /T%2_4_0 /E%3 /Fh%CompileShadersOutput%\%1_%3.inc /Fd%CompileShadersOutput%\%1_%3.pdb /Vn%1_%3 
+set fxc=%PCFXC% "%1.hlsl" %FXCOPTS% /T%2_4_0 /E%3 "/Fh%CompileShadersOutput%\%1_%3.inc" "/Fd%CompileShadersOutput%\%1_%3.pdb" /Vn%1_%3
 echo.
 echo %fxc%
 %fxc% || set error=1
 exit /b
+
+:needfxc
+echo ERROR: CompileShaders requires FXC.EXE
+exit /b 1