CMakeLists.txt

@@ -794,7 +794,7 @@ set(POSTCONFIGURE_SCRIPT "" CACHE FILEPATH "Run given CMake script as the last s
 mark_as_advanced(POSTCONFIGURE_SCRIPT)
 
 # USD Hydra plugin.
-if(WIN32 AND WITH_USD)
+if(WIN32 AND WITH_USD AND WITH_MATERIALX)
   option(WITH_HYDRA "Enable USD Hydra plugin" ON)
 endif()
 

source/blender/render/hydra/CMakeLists.txt

@@ -1,6 +1,10 @@
 # SPDX-License-Identifier: Apache-2.0
 # Copyright 2011-2022 Blender Foundation
 
+if(NOT TARGET MaterialXCore OR NOT TARGET MaterialXFormat)
+  message(FATAL_ERROR "Hydra Scene Delegate requires MaterialX")
+endif()
+
 if(WIN32)
   add_definitions(-DNOMINMAX -DWIN32_LEAN_AND_MEAN -DBOOST_DEBUG_PYTHON)
 endif()
@@ -70,6 +74,8 @@ set(SRC
   sceneDelegate/material.cc
   sceneDelegate/mesh.h
   sceneDelegate/mesh.cc
+  sceneDelegate/mtlxHydraAdapter.h
+  sceneDelegate/mtlxHydraAdapter.cc
   sceneDelegate/light.h
   sceneDelegate/light.cc
   sceneDelegate/world.h
@@ -86,17 +92,8 @@ set(LIB
 
 blender_add_lib(bf_render_hydra "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
 
-if(TARGET MaterialXCore AND TARGET MaterialXFormat)
-  target_sources(bf_render_hydra PRIVATE
-    sceneDelegate/mtlxHydraAdapter.h
-    sceneDelegate/mtlxHydraAdapter.cc)
-  target_compile_definitions(bf_render_hydra PRIVATE
-    _MTLX_TRANSLATION_ENABLED)
 target_link_libraries(bf_render_hydra PRIVATE
     MaterialXCore
     MaterialXFormat)
-else()
-  message(WARN "Compiling Hydra Scene Delegate without MaterialX-to-Hydra translation")
-endif()
 
 add_dependencies(bf_render_hydra bf_rna)

source/blender/render/hydra/sceneDelegate/material.cc

@@ -51,7 +51,6 @@ VtValue MaterialData::get_data(TfToken const &key)
 
 pxr::VtValue MaterialData::material_resource()
 {
-#if defined(_MTLX_TRANSLATION_ENABLED)
   std::string const &path = mtlx_path.GetResolvedPath();
   if (!path.empty()) {
     HdRenderDelegate *render_delegate = scene_delegate->GetRenderIndex().GetRenderDelegate();
@@ -63,9 +62,6 @@ pxr::VtValue MaterialData::material_resource()
         path, shader_source_types, render_contexts, &material_network_map);
     return VtValue(material_network_map);
   }
-#else
-#  pragma message("Compiling without MaterialX translation")
-#endif
 
   return pxr::VtValue();
 }

source/blender/render/hydra/sceneDelegate/mtlxHydraAdapter.h

@@ -3,8 +3,6 @@
 
 #pragma once
 
-#if defined(_MTLX_TRANSLATION_ENABLED)
-
 #include <pxr/base/tf/token.h>
 #include <pxr/pxr.h>
 
@@ -20,5 +18,3 @@ void HdMtlxConvertToMaterialNetworkMap(std::string const &mtlxPath,
                                        HdMaterialNetworkMap *out);
 
 PXR_NAMESPACE_CLOSE_SCOPE
-
-#endif  // _MTLX_TRANSLATION_ENABLED