Make MATERIALX_SLANG_RHI_SOURCE_DIR available in CMake GUI

Signed-off-by: Jonathan Stone <[email protected]>

Author: jstone-lucasfilm

CMakeLists.txt

@@ -136,8 +136,8 @@ set(MATERIALX_OSL_BINARY_TESTRENDER "" CACHE FILEPATH "Full path to the OSL test
 set(MATERIALX_OSL_INCLUDE_PATH "" CACHE PATH "Full path to OSL shader includes (e.g. 'stdosl.h').")
 
 # Helpers for Slang validation
+set(MATERIALX_SLANG_RHI_SOURCE_DIR "" CACHE PATH "Full path to the Slang RHI build directory.")
 if (MATERIALX_BUILD_GEN_SLANG)
-    set(MATERIALX_SLANG_RHI_SOURCE_DIR "" CACHE PATH "Full path to the Slang RHI build directory.")
     if (MATERIALX_BUILD_RENDER AND NOT MATERIALX_SLANG_RHI_SOURCE_DIR)
         message(WARNING "MATERIALX_SLANG_RHI_SOURCE_DIR must be set to build MaterialXRenderSlang.")
     endif()
@@ -216,9 +216,7 @@ mark_as_advanced(MATERIALX_BUILD_APPLE_FRAMEWORK)
 mark_as_advanced(MATERIALX_MDL_BINARY_MDLC)
 mark_as_advanced(MATERIALX_MDL_MODULE_PATHS)
 mark_as_advanced(MATERIALX_MDL_SDK_DIR)
-if (MATERIALX_BUILD_GEN_SLANG)
-    mark_as_advanced(MATERIALX_SLANG_RHI_SOURCE_DIR)
-endif()
+mark_as_advanced(MATERIALX_SLANG_RHI_SOURCE_DIR)
 
 if (MATERIALX_BUILD_USE_CCACHE)
     # Setup CCache for C/C++ compilation