1 files changed, 91 insertions, 0 deletions
diff --git a/Client/Source/Phy2DLite/Arbiter.h b/Client/Source/Phy2DLite/Arbiter.h
new file mode 100644
index 0000000..2cdbc9f
--- /dev/null
+++ b/Client/Source/Phy2DLite/Arbiter.h
@@ -0,0 +1,91 @@
+#pragma once
+
+#include "Math.h"
+
+namespace Phy2D
+{
+
+    struct Body;
+
+    union FeaturePair
+    {
+        struct Edges
+        {
+            char inEdge1;
+            char outEdge1;
+            char inEdge2;
+            char outEdge2;
+        } e;
+        int value;
+    };
+
+    struct Contact
+    {
+        Contact() : Pn(0.0f), Pt(0.0f), Pnb(0.0f) {}
+
+        Vec2 position;
+        Vec2 normal;
+        Vec2 r1, r2;
+        number separation;
+        number Pn;	// accumulated normal impulse
+        number Pt;	// accumulated tangent impulse
+        number Pnb;	// accumulated normal impulse for position bias
+        number massNormal, massTangent;
+        number bias;
+        FeaturePair feature;
+    };
+
+    struct ArbiterKey
+    {
+        ArbiterKey(Body* b1, Body* b2)
+        {
+            if (b1 < b2)
+            {
+                body1 = b1; body2 = b2;
+            }
+            else
+            {
+                body1 = b2; body2 = b1;
+            }
+        }
+
+        Body* body1;
+        Body* body2;
+    };
+
+    struct Arbiter
+    {
+        enum { MAX_POINTS = 2 };
+
+        Arbiter(Body* b1, Body* b2);
+
+        void Update(Contact* contacts, int numContacts);
+
+        void PreStep(number inv_dt);
+        void ApplyImpulse();
+
+        Contact contacts[MAX_POINTS];
+        int numContacts;
+
+        Body* body1;
+        Body* body2;
+
+        // Combined friction
+        number friction;
+    };
+
+    // This is used by std::set
+    inline bool operator < (const ArbiterKey& a1, const ArbiterKey& a2)
+    {
+        if (a1.body1 < a2.body1)
+            return true;
+
+        if (a1.body1 == a2.body1 && a1.body2 < a2.body2)
+            return true;
+
+        return false;
+    }
+
+    int Collide(Contact* contacts, Body* body1, Body* body2);
+
+}
+\ No newline at end of file