Fix BRN build sourcetree (#1532)

related to BabylonJS/BabylonReactNative#665

Some dependencies are fetched only for the platform being built.
`BABYLON_NATIVE_BUILD_SOURCETREE` variable has been added to allow
fetching independently of active platform.

---------

Co-authored-by: Drew Fillebrown <[email protected]>

Author: CedricGuillemet

CMakeLists.txt

@@ -11,7 +11,7 @@ include(FetchContent)
 # --------------------------------------------------
 FetchContent_Declare(AndroidExtensions
     GIT_REPOSITORY https://github.com/BabylonJS/AndroidExtensions.git
-    GIT_TAG 7d88a601fda9892791e7b4e994e375e049615688)
+    GIT_TAG 66520bff9b57030b67894a4934d18ad7e161ba6f)
 FetchContent_Declare(arcana.cpp
     GIT_REPOSITORY https://github.com/microsoft/arcana.cpp.git
     GIT_TAG 1a8a5d6e95413ed14b38a6ac9419048f9a9c8009)
@@ -48,18 +48,27 @@ FetchContent_Declare(libwebp
 
 FetchContent_MakeAvailable(CMakeExtensions)
 
-if(VISIONOS)
+# BABYLON_NATIVE_BUILD_SOURCETREE flag is used by BabylonReactNative NPM build process.
+# CMake script is run twice. At package creation, BABYLON_NATIVE_BUILD_SOURCETREE is ON
+# which makes all dependencies to be fetched and packaged.
+# At build time, cmake is run again on BabylonNative root but FETCHCONTENT_FULLY_DISCONNECTED is ON
+# and FetchContent_MakeAvailable_With_Message will use provided local folder provided to cmake command line
+# like '-DFETCHCONTENT_SOURCE_DIR_BGFX.CMAKE=../shared/Babylon/....'
+
+if(VISIONOS OR IOS OR BABYLON_NATIVE_BUILD_SOURCETREE)
     FetchContent_MakeAvailable_With_Message(ios-cmake)
-    set(CMAKE_TOOLCHAIN_FILE "${ios-cmake_SOURCE_DIR}/ios.toolchain.cmake" CACHE PATH "")
+    if(NOT BABYLON_NATIVE_BUILD_SOURCETREE)
+        set(CMAKE_TOOLCHAIN_FILE "${ios-cmake_SOURCE_DIR}/ios.toolchain.cmake" CACHE PATH "")
+    endif()
+    set(ENABLE_ARC OFF CACHE STRING "Enables or disables ARC support.")
+endif()
+
+if(VISIONOS)
     set(PLATFORM "VISIONOSCOMBINED" CACHE STRING "")
     set(DEPLOYMENT_TARGET "1.0" CACHE STRING "")
-    set(ENABLE_ARC OFF CACHE STRING "Enables or disables ARC support.")
 elseif(IOS)
-    FetchContent_MakeAvailable_With_Message(ios-cmake)
-    set(CMAKE_TOOLCHAIN_FILE "${ios-cmake_SOURCE_DIR}/ios.toolchain.cmake" CACHE PATH "")
     set(PLATFORM "OS64COMBINED" CACHE STRING "")
     set(DEPLOYMENT_TARGET "13" CACHE STRING "")
-    set(ENABLE_ARC OFF CACHE STRING "Enables or disables ARC support.")
 endif()
 
 project(BabylonNative)

Dependencies/CMakeLists.txt

@@ -3,7 +3,7 @@ set(CMAKE_POLICY_DEFAULT_CMP0077 NEW)
 # --------------------------------------------------
 # AndroidExtensions
 # --------------------------------------------------
-if(ANDROID)
+if(ANDROID OR BABYLON_NATIVE_BUILD_SOURCETREE)
     FetchContent_MakeAvailable_With_Message(AndroidExtensions)
 endif()
 
@@ -15,7 +15,7 @@ FetchContent_MakeAvailable_With_Message(arcana.cpp)
 # --------------------------------------------------
 # arcore-android-sdk
 # --------------------------------------------------
-if(ANDROID)
+if(ANDROID OR BABYLON_NATIVE_BUILD_SOURCETREE)
     FetchContent_MakeAvailable_With_Message(arcore-android-sdk)
 endif()
 
@@ -192,7 +192,7 @@ endif()
 # xr
 # --------------------------------------------------
 # Currently supported on Android via ARCore, and iOS via ARKit.
-if(BABYLON_NATIVE_PLUGIN_NATIVEXR AND (ANDROID OR IOS))
+if((BABYLON_NATIVE_PLUGIN_NATIVEXR AND (ANDROID OR IOS)) OR BABYLON_NATIVE_BUILD_SOURCETREE)
     add_subdirectory(xr)
     set_property(TARGET xr PROPERTY FOLDER Dependencies/xr)
     warnings_as_errors(xr)

Dependencies/xr/CMakeLists.txt

@@ -33,7 +33,7 @@ if (ANDROID)
     set(SOURCES ${SOURCES}
         "Source/ARCore/Include/IXrContextARCore.h"
         "Source/ARCore/XR.cpp")
-elseif (IOS)
+elseif(IOS OR BABYLON_NATIVE_BUILD_SOURCETREE)
     set(SOURCES ${SOURCES}
         "Source/ARKit/Include/IXrContextARKit.h"
         "Source/ARKit/XR.mm")