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Bullet Continuous Collision Detection and Physics Library
Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/

This software is provided 'as-is', without any express or implied warranty.
In no event will the authors be held liable for any damages arising from the use of this software.
Permission is granted to anyone to use this software for any purpose, 
including commercial applications, and to alter it and redistribute it freely, 
subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.


//todo: make into a proper class working with the iterative constraint solver

class btRigidBody;
#include "../../LinearMath/btVector3.h"
#include "../../LinearMath/btScalar.h"
struct btContactSolverInfo;
class btManifoldPoint;

enum {

typedef btScalar (*ContactSolverFunc)(btRigidBody& body1,
                                                       btRigidBody& body2,
                                                       class btManifoldPoint& contactPoint,
                                                       const btContactSolverInfo& info);

///stores some extra information to each contact point. It is not in the contact point, because that want to keep the collision detection independent from the constraint solver.
00042 struct btConstraintPersistentData
      inline btConstraintPersistentData()
                        /// total applied impulse during most recent frame
00061                   btScalar    m_appliedImpulse;
                  btScalar    m_prevAppliedImpulse;
                  btScalar    m_accumulatedTangentImpulse0;
                  btScalar    m_accumulatedTangentImpulse1;
                  btScalar    m_jacDiagABInv;
                  btScalar    m_jacDiagABInvTangent0;
                  btScalar    m_jacDiagABInvTangent1;
                  int         m_persistentLifeTime;
                  btScalar    m_restitution;
                  btScalar    m_friction;
                  btScalar    m_penetration;
                  btVector3   m_frictionWorldTangential0;
                  btVector3   m_frictionWorldTangential1;

                  btVector3   m_frictionAngularComponent0A;
                  btVector3   m_frictionAngularComponent0B;
                  btVector3   m_frictionAngularComponent1A;
                  btVector3   m_frictionAngularComponent1B;

                  //some data doesn't need to be persistent over frames: todo: clean/reuse this
                  btVector3   m_angularComponentA;
                  btVector3   m_angularComponentB;
                  ContactSolverFunc m_contactSolverFunc;
                  ContactSolverFunc m_frictionSolverFunc;


///bilateral constraint between two dynamic objects
///positive distance = separation, negative distance = penetration
void resolveSingleBilateral(btRigidBody& body1, const btVector3& pos1,
                      btRigidBody& body2, const btVector3& pos2,
                      btScalar distance, const btVector3& normal,btScalar& impulse ,btScalar timeStep);

///contact constraint resolution:
///calculate and apply impulse to satisfy non-penetration and non-negative relative velocity constraint
///positive distance = separation, negative distance = penetration
btScalar resolveSingleCollision(
      btRigidBody& body1,
      btRigidBody& body2,
            btManifoldPoint& contactPoint,
             const btContactSolverInfo& info);

btScalar resolveSingleFriction(
      btRigidBody& body1,
      btRigidBody& body2,
      btManifoldPoint& contactPoint,
      const btContactSolverInfo& solverInfo

btScalar resolveSingleCollisionCombined(
      btRigidBody& body1,
      btRigidBody& body2,
      btManifoldPoint& contactPoint,
      const btContactSolverInfo& solverInfo


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