First Commit

For Azeroth!

dep/g3dlite/source/GUniqueID.cpp

@@ -0,0 +1,78 @@
+/**
+  @file GUniqueID.cpp
+  @author Morgan McGuire, http://graphics.cs.williams.edu
+ */
+#include "G3D/GUniqueID.h"
+#include "G3D/BinaryInput.h"
+#include "G3D/TextInput.h"
+#include "G3D/BinaryOutput.h"
+#include "G3D/TextOutput.h"
+#include "G3D/NetworkDevice.h"
+
+namespace G3D {
+
+void GUniqueID::serialize(BinaryOutput& b) const {
+    b.writeUInt64(id);
+}
+
+
+void GUniqueID::deserialize(BinaryInput& b) {
+    id = b.readUInt64();
+}
+
+void GUniqueID::serialize(TextOutput& t) const {
+    t.writeSymbol("(");
+    t.writeNumber((double)(id >> 32));
+    t.writeNumber((double)(id & 0xFFFFFFFF));
+    t.writeSymbol(")");
+}
+
+void GUniqueID::deserialize(TextInput& t) {
+    t.readSymbol("(");
+    id = (((uint64)t.readNumber()) << 32) + (uint64)t.readNumber();
+    t.readSymbol(")");
+}
+
+
+GUniqueID GUniqueID::create(uint16 tag) {
+    static uint64 counter = 0;
+    static uint64 systemID = 0;
+    
+    if (systemID == 0) {
+        // Create a unique ID for this machine/program instance
+        
+        // TODO: see ioctl(skfd, SIOCGIFHWADDR, &if_hwaddr)
+        Array<NetAddress> addr;
+        NetworkDevice::instance()->localHostAddresses(addr);
+        if (addr.size() > 0) {
+            systemID |= addr[0].ip();
+        }
+        
+        union {
+            float64 ft;
+            uint64 ut;
+        };
+        ft = System::time();
+        systemID = ut << 22;
+        systemID ^= ((uint64)iRandom(0, 32768)) << 8;
+        
+        systemID &= ~((uint64)1023 << 54);
+
+        // Ensure that the systemID is non-zero (vanishingly small probability)
+        if (systemID == 0) {
+            systemID = 1;
+        }
+    }
+    
+    // No need for modulo; we'll all be dead before this counter
+    // overflows 54 bits
+    ++counter;
+    
+    GUniqueID i;
+    
+    i.id = (((uint64)(tag & 1023)) << 54) | (counter ^ systemID);
+    
+    return i;
+}
+
+} // G3D