add option for btDbvtBroadphase (comparison)

src/Bullet3Collision/BroadPhaseCollision/b3OverlappingPair.h

@@ -0,0 +1,45 @@
+#ifndef B3_OVERLAPPING_PAIR_H
+#define B3_OVERLAPPING_PAIR_H
+
+#include "Bullet3Common/btInt2.h"
+
+//typedef btInt2 btBroadphasePair;
+struct btBroadphasePair : public btInt2
+{
+	explicit btBroadphasePair(){}
+	btBroadphasePair(int xx,int yy)
+	{
+		if (xx < yy)
+        { 
+            x = xx; 
+            y = yy;
+        }
+        else 
+        { 
+			x = yy;
+            y = xx;
+        }
+	}
+};
+
+class btBroadphasePairSortPredicate
+{
+	public:
+
+		bool operator() ( const btBroadphasePair& a, const btBroadphasePair& b ) const
+		{
+			const int uidA0 = a.x;
+			const int uidB0 = b.x;
+			const int uidA1 = a.y;
+			const int uidB1 = b.y;
+			return uidA0 > uidB0 || (uidA0 == uidB0 && uidA1 > uidB1); 
+		}
+};
+
+SIMD_FORCE_INLINE bool operator==(const btBroadphasePair& a, const btBroadphasePair& b) 
+{
+	 return (a.x == b.x ) && (a.y == b.y );
+}
+
+#endif //B3_OVERLAPPING_PAIR_H
+