[Misc] Check for the available and installed Vulkan SDK versions before downloading and installing.

(cherry picked from commit db1c1d43e3)

misc/scripts/install_vulkan_sdk_macos.sh

@@ -3,6 +3,28 @@
 set -euo pipefail
 IFS=$'\n\t'
 
+# Check currently installed and latest available Vulkan SDK versions.
+if [ -d "$HOME/VulkanSDK" ]; then
+	if command -v jq 2>&1 >/dev/null; then
+		curl -L "https://sdk.lunarg.com/sdk/download/latest/mac/config.json" -o /tmp/vulkan-sdk.json
+
+		new_ver=`jq -r '.version' /tmp/vulkan-sdk.json`
+		new_ver=`echo "$new_ver" | awk -F. '{ printf("%d%02d%04d%02d\n", $1,$2,$3,$4); }';`
+
+		rm -f /tmp/vulkan-sdk.json
+
+		for f in $HOME/VulkanSDK/*; do
+			if [ -d "$f" ]; then
+				f=`echo "${f##*/}" | awk -F. '{ printf("%d%02d%04d%02d\n", $1,$2,$3,$4); }';`
+				if [ $f -ge $new_ver ]; then
+					echo 'Latest or newer Vulkan SDK is already installed. Skipping installation.'
+					exit 0
+				fi
+			fi
+		done
+	fi
+fi
+
 # Download and install the Vulkan SDK.
 curl -L "https://sdk.lunarg.com/sdk/download/latest/mac/vulkan-sdk.zip" -o /tmp/vulkan-sdk.zip
 unzip /tmp/vulkan-sdk.zip -d /tmp