#!/bin/sh
BF_DIST_BIN=$(dirname "$(readlink -f "$0")")
BF_PROGRAM="blender"

# Attempt to preload system TBB library if it is newer than the one we bundled.
# This solves problems with the Intel ray-tracing library using this newer TBB
# while Blender is already using an older one.

# Library name with major version that we needed.
BF_TBB_LIB_NAME=$(readlink ${BF_DIST_BIN}/lib/libtbb.so)

if [ -n "$BF_TBB_LIB_NAME" ]; then
	BF_TBB_LIB_NAME=$(basename $BF_TBB_LIB_NAME)
	# Get absolute path from LD_DEBUG output trying to preload this library.
	# We have not found a better alternative that takes into account LD_LIBRARY_PATH.
	BF_TBB_LD_OUTPUT=$(LD_DEBUG=versions LD_PRELOAD="$BF_TBB_LIB_NAME" /bin/true 2>&1 >/dev/null)
	BF_TBB_LIB_PATH=$(echo "$BF_TBB_LD_OUTPUT" |
		grep "calling init:" |
		grep "$BF_TBB_LIB_NAME" |
		(sed -n "s/.*calling init: \([^[:space:]]\+\).*\/$BF_TBB_LIB_NAME$/\1/p" 2>/dev/null))
fi

if [ -n "$BF_TBB_LIB_PATH" ]; then
	# If the library exists, compare its version to the one we bundle.
	BF_TBB_SYSTEM_NAME=$(readlink $BF_TBB_LIB_PATH/$BF_TBB_LIB_NAME)
	BF_TBB_BUNDLED_NAME=$(readlink $BF_DIST_BIN/lib/$BF_TBB_LIB_NAME)
	if [ -n "$BF_TBB_SYSTEM_NAME" ] && [ -n "$BF_TBB_BUNDLED_NAME" ]; then
		BF_TBB_SYSTEM_NAME=$(basename $BF_TBB_SYSTEM_NAME)
		BF_TBB_BUNDLED_NAME=$(basename $BF_TBB_BUNDLED_NAME)
		BF_TBB_NEWEST_NAME=$(printf "%s\n%s\n" "$BF_TBB_SYSTEM_NAME" "$BF_TBB_BUNDLED_NAME" |
			(sort -V 2>/dev/null) |
			(tail -n 1 2>/dev/null))
		# If the system TBB version is newer, preload it.
		if [ "$BF_TBB_SYSTEM_NAME" = "$BF_TBB_NEWEST_NAME" ]; then
			BLENDER_RESTORE_LD_PRELOAD=${LD_PRELOAD}
			LD_PRELOAD=$BF_TBB_LIB_PATH/$BF_TBB_LIB_NAME:${LD_PRELOAD}
			export BLENDER_RESTORE_LD_PRELOAD
			export LD_PRELOAD
		fi
	fi
fi

# Add own lib folder first, because Steam or other environments may set an
# $LD_LIBRARY_PATH that has priority over the run-path in the Blender executable,
# but contains incompatible libraries.
LD_LIBRARY_PATH=${BF_DIST_BIN}/lib:${LD_LIBRARY_PATH}

export LD_LIBRARY_PATH

exec "$BF_DIST_BIN/$BF_PROGRAM" "$@"