#!/usr/bin/env bash
#
# Copyright (c) 2016-2018 The Brenwill Workshop Ltd.
#
# fetchDependencies - Retrieves the correct versions of all dependencies
#
# macOS usage: ./fetchDependencies [-sdk]
#
#   -sdk = Load for the LunarG SDK, using symlinks to repos in SDK instead of fetching
#          Vulkan-LoaderAndValidationLayers and glslang repositories.


# ----------------- Functions -------------------

# Update a repository. If it exists, fetch it, if not clone it.
# $1 repo name
# $2 repo url
# $3 repo revision (commit SHA)
update_repo() {
	echo "$1 repo: $2"
	echo "$1 revision: $3"

	if [ -d $1 -a -d $1/.git ]; then
		cd $1
		git fetch --all
		git checkout --force $3
		cd -
	else
		rm -rf $1
		git clone $2 $1
		cd $1
		git checkout $3
		cd -
	fi
}

# Build a repository
# $1 repo name
build_repo() {
	echo "Building $1"

	mkdir -p $1/build
	cd $1/build
	cmake ..
	make
	cd -
}


# ----------------- Main -------------------

EXT_DIR=External
EXT_REV_DIR=ExternalRevisions
V_LVL_NAME=Vulkan-LoaderAndValidationLayers
GLSLANG_NAME=glslang

echo
echo Retrieving MoltenVK dependencies into ${EXT_DIR}.
echo

mkdir -p ${EXT_DIR}
cd ${EXT_DIR}


# ----------------- Cereal -------------------

REPO_NAME=cereal
REPO_URL="https://github.com/USCiLab/${REPO_NAME}.git"
REPO_REV=$(cat "../${EXT_REV_DIR}/${REPO_NAME}_repo_revision")

update_repo ${REPO_NAME} ${REPO_URL} ${REPO_REV}


# ----------------- SPIRV-Cross -------------------

REPO_NAME=SPIRV-Cross
REPO_URL="https://github.com/KhronosGroup/${REPO_NAME}.git"
REPO_REV=$(cat "../${EXT_REV_DIR}/${REPO_NAME}_repo_revision")

update_repo ${REPO_NAME} ${REPO_URL} ${REPO_REV}


# ----------------- VulkanSamples -------------------

REPO_NAME=VulkanSamples
REPO_URL="https://github.com/brenwill/${REPO_NAME}.git"
REPO_REV=$(cat "../${EXT_REV_DIR}/${REPO_NAME}_repo_revision")

update_repo ${REPO_NAME} ${REPO_URL} ${REPO_REV}


# ----------------- Vulkan-LoaderAndValidationLayers, glslang, SPIRV-Tools & SPIRV-Headers -------------------

# When MoltenVK is loaded as a dependency of the LunarG SDK, the LunarG SDK already
# has Vulkan-LoaderAndValidationLayers & glslang, so create simlinks instead.
if [ "$1" = "-sdk" ]; then

	REPO_NAME=${V_LVL_NAME}
	rm -rf ${REPO_NAME}
	ln -sfn ../../.. ${REPO_NAME}

	REPO_NAME=${GLSLANG_NAME}
	rm -rf ${REPO_NAME}
	ln -sfn ../../${REPO_NAME} ${REPO_NAME}

else

	# ----------------- Vulkan-LoaderAndValidationLayers -------------------

	REPO_NAME=${V_LVL_NAME}
	REPO_URL="https://github.com/KhronosGroup/${REPO_NAME}.git"
	REPO_REV=$(cat "../${EXT_REV_DIR}/${REPO_NAME}_repo_revision")

	update_repo ${REPO_NAME} ${REPO_URL} ${REPO_REV}


	# ----------------- glslang, SPIRV-Tools & SPIRV-Headers ---------------

	REPO_NAME=${GLSLANG_NAME}
	REPO_URL=$(cat "${V_LVL_NAME}/external_revisions/glslang_giturl")
	REPO_REV=$(cat "${V_LVL_NAME}/external_revisions/glslang_revision")

	update_repo ${REPO_NAME} ${REPO_URL} ${REPO_REV}

	cd ${REPO_NAME}
	./update_glslang_sources.py
	cd -

	build_repo ${REPO_NAME}

fi

cd ..