2D Collision, Physics, Rigid body dynamics

If you need an Arbiter Stub then use this one, i'll have it finished real soon:

Rem
* Copyright (c) 2006 Erin Catto http://www.gphysics.com"
*
* Permission To use, copy, modify, distribute And sell this software
* And its documentation For any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies.
* Erin Catto makes no representations about the suitability 
* of this software For any purpose.  
* It is provided "as is" without express Or implied warranty.
End Rem

'/**
' *
' */
Const inEdge1:Int = 0
Const inEdge2:Int = 1
Const outEdge1:Int = 2
Const outEdge2:Int = 3

'/**
' *
' */
Type TFeaturePair

	Field e:Byte Ptr
	Field key:Int

	Method New( )
		e = Byte Ptr( Varptr( key ) )
	End Method

End Type

'/**
' *
' */
Type TContact

	Field position:TVec2
	Field normal:TVec2
	Field separation:Float
	Field accumulatedNormalImpulse:Float
	Field accumulatedTangentImpulse:Float
	Field massNormal:Float, massTangent:Float
	Field bias:Float
	Field feature:TFeaturePair;

End Type

'/**
' *
' */
Function Arbiter:TArbiter( a:TBody, b:TBody )

End Function

'/**
' *
' */
Type TArbiter

	Const MAX_POINTS:Int = 2
	
	Field contacts:TContact[MAX_POINTS]
	Field numContacts:Int
	Field body1:TBody
	Field body2:TBody
	Field friction:Float
	
	Method Update( contacts:TContact[], int numContacts )
	
	End Method
	
	Method PreStep( inv_dt:Float )
		
	End Method

	Method ApplyImpulse( )
	
	End Method

End Type

Instead of TFeaturePair.e.inEdgex use TFeaturePair.e[inEdgex] ;)