From 2334d48856bfeea37875bd4d02881179cf3cda32 Mon Sep 17 00:00:00 2001
From: Georg Hagen <git.georg.hagen@madvoxel.com>
Date: Wed, 18 Dec 2024 00:08:57 +0100
Subject: [PATCH] Add function to create custom v8 UUIDs that use date&time for
 the first 6 byte in a human-readable form

---
 3rdParty/libstud-uuid/CMakeLists.txt |  2 +-
 openVulkanoCpp/Base/UUID.cpp         | 49 ++++++++++++++++++++++++++++
 openVulkanoCpp/Base/UUID.hpp         |  2 ++
 3 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100644 openVulkanoCpp/Base/UUID.cpp

diff --git a/3rdParty/libstud-uuid/CMakeLists.txt b/3rdParty/libstud-uuid/CMakeLists.txt
index 1e9aae3..c0569a5 100644
--- a/3rdParty/libstud-uuid/CMakeLists.txt
+++ b/3rdParty/libstud-uuid/CMakeLists.txt
@@ -1,7 +1,7 @@
 include(FetchContent)
 
 if(NOT DEFINED LIBSTUD_REPO)
-    set(LIBSTUD_REPO https://github.com/GeorgH93/libstud-uuid.git)
+    set(LIBSTUD_REPO https://git.madvoxel.net/Mirrors/libstud-uuid.git)
 endif ()
 
 FetchContent_Declare(
diff --git a/openVulkanoCpp/Base/UUID.cpp b/openVulkanoCpp/Base/UUID.cpp
new file mode 100644
index 0000000..ca70295
--- /dev/null
+++ b/openVulkanoCpp/Base/UUID.cpp
@@ -0,0 +1,49 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#include "UUID.hpp"
+#include <ctime>
+
+namespace OpenVulkano
+{
+	UUID GenerateTimePrefixedCustomUUID()
+	{
+		UUID uuid = UUID::generate();
+
+		uuid.time_low = 0;
+		uuid.time_mid = 0;
+		time_t now = time(nullptr);
+		struct tm* timeinfo = localtime(&now);
+
+		// Extract time components
+		uint32_t year = timeinfo->tm_year % 100;  // Get last two digits of year
+		uint32_t month = timeinfo->tm_mon + 1;    // Month is 0-based
+		uint32_t day = timeinfo->tm_mday;
+		uint32_t hour = timeinfo->tm_hour;
+		uint16_t minute = timeinfo->tm_min;
+		uint16_t second = timeinfo->tm_sec;
+
+		// Each decimal digit takes 4 bits in the final hex number
+		uuid.time_low |= (year / 10) << 28;
+		uuid.time_low |= (year % 10) << 24;
+		uuid.time_low |= (month / 10) << 20;
+		uuid.time_low |= (month % 10) << 16;
+		uuid.time_low |= (day / 10) << 12;
+		uuid.time_low |= (day % 10) << 8;
+		uuid.time_low |= (hour / 10) << 4;
+		uuid.time_low |= (hour % 10) << 0;
+		uuid.time_mid |= (minute / 10) << 12;
+		uuid.time_mid |= (minute % 10) << 8;
+		uuid.time_mid |= (second / 10) << 4;
+		uuid.time_mid |= (second % 10) << 0;
+
+		// Set version to custom
+		uuid.time_hiv &= ~(static_cast<uint16_t>(uuid.version()) << 12);
+		uuid.time_hiv |= 8 << 12;
+
+		return uuid;
+	}
+}
\ No newline at end of file
diff --git a/openVulkanoCpp/Base/UUID.hpp b/openVulkanoCpp/Base/UUID.hpp
index 0fa9288..3e02aed 100644
--- a/openVulkanoCpp/Base/UUID.hpp
+++ b/openVulkanoCpp/Base/UUID.hpp
@@ -11,4 +11,6 @@
 namespace OpenVulkano
 {
 	typedef stud::uuid UUID;
+
+	UUID GenerateTimePrefixedCustomUUID();
 }