Add function to create custom v8 UUIDs that use date&time for the first 6 byte in a human-readable form

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;
+	}
+}