From 33be57faac0edb39192fe3b78d543edefc219a27 Mon Sep 17 00:00:00 2001
From: "Steve J. Cai" <steve@postel3d.com>
Date: Fri, 22 Sep 2023 03:47:50 +0000
Subject: [PATCH] Build for emscripten

---
 Hydrogent/CMakeLists.txt                | 64 ++++++++++++++++++-------
 Hydrogent/{readme.md => README.md}      |  0
 Hydrogent/include/HnMaterialNetwork.hpp |  2 +-
 Hydrogent/include/HnMesh.hpp            |  2 +-
 Hydrogent/include/HnRendererImpl.hpp    |  2 +
 5 files changed, 50 insertions(+), 20 deletions(-)
 rename Hydrogent/{readme.md => README.md} (100%)

diff --git a/Hydrogent/CMakeLists.txt b/Hydrogent/CMakeLists.txt
index 1a8f4c52..e8680106 100644
--- a/Hydrogent/CMakeLists.txt
+++ b/Hydrogent/CMakeLists.txt
@@ -35,11 +35,19 @@ add_library(Diligent-Hydrogent STATIC README.md ${SOURCE} ${INCLUDE} ${INTERFACE
 
 set_common_target_properties(Diligent-Hydrogent)
 
-find_package(Python3 COMPONENTS Interpreter Development REQUIRED)
+if(NOT PLATFORM_EMSCRIPTEN)
+    find_package(Python3 COMPONENTS Interpreter Development REQUIRED)
+endif()
 
 add_library(USD_LIBS INTERFACE)
 
-if(${CMAKE_GENERATOR} MATCHES "Visual Studio")
+if(pxr_FOUND)
+    # PXR is already loaded, so we can use its variables.
+    target_include_directories(USD_LIBS
+    INTERFACE
+        ${PXR_INCLUDE_DIRS}
+    )
+elseif(${CMAKE_GENERATOR} MATCHES "Visual Studio")
     # Boost version depends on Visual Studio version. Since we can't use wildcards in
     # generator expressions, we have to find boost directory for each configuration
     file(GLOB BOOST_INCLUDE_DEBUG "${DILIGENT_USD_PATH}/Debug/include/boost-*")
@@ -82,21 +90,39 @@ if(MSVC)
     target_compile_options(USD_LIBS INTERFACE /wd4244 /wd4305 /wd4127 /wd4267)
 endif()
 
-target_link_libraries(USD_LIBS
-INTERFACE
-    usd_gf
-    usd_ar
-    usd_sdf
-    usd_tf
-    usd_usd
-    usd_plug
-    usd_hd
-    usd_usdImaging
-    usd_vt
-    usd_hio
-    usd_sdr
-    usd_ndr
-)
+if(pxr_FOUND)
+    target_link_libraries(USD_LIBS
+    INTERFACE
+        gf
+        ar
+        sdf
+        tf
+        usd
+        plug
+        hd
+        usdImaging
+        vt
+        hio
+        sdr
+        ndr
+    )
+else()
+    target_link_libraries(USD_LIBS
+    INTERFACE
+        usd_gf
+        usd_ar
+        usd_sdf
+        usd_tf
+        usd_usd
+        usd_plug
+        usd_hd
+        usd_usdImaging
+        usd_vt
+        usd_hio
+        usd_sdr
+        usd_ndr
+    )
+endif()
 
 target_include_directories(Diligent-Hydrogent
 PUBLIC
@@ -112,7 +138,9 @@ PUBLIC
 
 # We need to enable RTTI for USD
 add_library(EnableRTTI INTERFACE)
-target_compile_options(EnableRTTI INTERFACE /GR)
+if(MSVC)
+    target_compile_options(EnableRTTI INTERFACE /GR)
+endif()
 
 target_link_libraries(Diligent-Hydrogent
 PRIVATE
diff --git a/Hydrogent/readme.md b/Hydrogent/README.md
similarity index 100%
rename from Hydrogent/readme.md
rename to Hydrogent/README.md
diff --git a/Hydrogent/include/HnMaterialNetwork.hpp b/Hydrogent/include/HnMaterialNetwork.hpp
index 2d1d18e7..9f383c67 100644
--- a/Hydrogent/include/HnMaterialNetwork.hpp
+++ b/Hydrogent/include/HnMaterialNetwork.hpp
@@ -27,7 +27,7 @@
 #pragma once
 
 // NoteL tbb.h must be included first to avoid compilation errors in tbb headers.
-#include "tbb/tbb.h"
+// #include "tbb/tbb.h"
 
 #include "pxr/base/vt/dictionary.h"
 #include "pxr/usd/sdf/path.h"
diff --git a/Hydrogent/include/HnMesh.hpp b/Hydrogent/include/HnMesh.hpp
index c457ad75..6f79f7c9 100644
--- a/Hydrogent/include/HnMesh.hpp
+++ b/Hydrogent/include/HnMesh.hpp
@@ -30,7 +30,7 @@
 #include <unordered_map>
 
 // NoteL tbb.h must be included before mesh.h to avoid compilation errors in tbb headers.
-#include "tbb/tbb.h"
+// #include "tbb/tbb.h"
 #include "pxr/imaging/hd/mesh.h"
 #include "pxr/base/tf/token.h"
 
diff --git a/Hydrogent/include/HnRendererImpl.hpp b/Hydrogent/include/HnRendererImpl.hpp
index 88b0b053..b89db9f9 100644
--- a/Hydrogent/include/HnRendererImpl.hpp
+++ b/Hydrogent/include/HnRendererImpl.hpp
@@ -111,6 +111,8 @@ class HnRendererImpl final : public ObjectBase<IHnRenderer>
     GPUCompletionAwaitQueue<RefCntAutoPtr<ITexture>> m_MeshIdReadBackQueue;
 };
 
+constexpr INTERFACE_ID HnRendererImpl::IID_Impl; // Needed only for C++ 14
+
 } // namespace USD
 
 } // namespace Diligent