build: make building on linux with embree easier

build-linux.sh

@@ -0,0 +1,22 @@
+#!/bin/bash
+
+BUILD_DIR=build-linux
+EMBREE_TGZ="https://github.com/embree/embree/releases/download/v2.11.0/embree-2.11.0.x86_64.linux.tar.gz"
+EMBREE_TGZ_NAME=$(basename "$EMBREE_TGZ")
+EMBREE_DIR_NAME=$(basename "$EMBREE_TGZ" ".tar.gz")
+EMBREE_WITH_VERSION=$(basename "$EMBREE_TGZ" ".x86_64.linux.tar.gz")
+
+if [ -d "$BUILD_DIR" ]; then
+  echo "$BUILD_DIR already exists, remove it first"
+  exit 1
+fi
+
+mkdir "$BUILD_DIR"
+cd "$BUILD_DIR"
+wget "$EMBREE_TGZ"
+tar xf "$EMBREE_TGZ_NAME"
+EMBREE_CMAKE_DIR="$(pwd)/$EMBREE_DIR_NAME/lib/cmake/$EMBREE_WITH_VERSION"
+cmake .. -DCMAKE_BUILD_TYPE=Release -Dembree_DIR="$EMBREE_CMAKE_DIR"
+make -j8
+cpack
+

light/CMakeLists.txt

@@ -61,8 +61,17 @@ if (embree_FOUND)
 
 		install(FILES ${EMBREE_DLLS} DESTINATION bin)
 	endif()
+	if(UNIX)
 		if (APPLE)
-		file(GLOB EMBREE_DYLIBS_WITH_SYMLINKS "${embree_DIR}/../../*.dylib")
+			set(SHARED_LIB_EXT dylib)
+		elseif (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+			set(SHARED_LIB_EXT "so.*")
+		else ()
+			message(FATAL_ERROR "only Linux and macOS currently supported")	
+		endif()
+
+
+		file(GLOB EMBREE_DYLIBS_WITH_SYMLINKS "${embree_DIR}/../../*.${SHARED_LIB_EXT}")
 
 		# Gather all .dylib's that are not symlinks
 		foreach(EMBREE_DYLIB ${EMBREE_DYLIBS_WITH_SYMLINKS})
@@ -77,7 +86,11 @@ if (embree_FOUND)
 		endforeach()
 
 		# so the executable will search for dylib's in the same directory as the executable 
+		if(APPLE)
 			add_custom_command(TARGET light POST_BUILD COMMAND bash ARGS -c \"install_name_tool -add_rpath @loader_path $<TARGET_FILE:light> || true\")
+		elseif (${CMAKE_SYSTEM_NAME} MATCHES "Linux")
+			SET(CMAKE_EXE_LINKER_FLAGS "-Wl,-rpath,\$ORIGIN")
+		endif()
 
 		install(FILES ${EMBREE_DYLIBS} DESTINATION bin)
 	endif()