1 files changed, 117 insertions, 0 deletions
diff --git a/public/rope_physics.h b/public/rope_physics.h
new file mode 100644
index 0000000..68f6a5d
--- /dev/null
+++ b/public/rope_physics.h
@@ -0,0 +1,117 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef ROPE_PHYSICS_H
+#define ROPE_PHYSICS_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#include "simple_physics.h"
+#include "networkvar.h"
+
+
+class CRopeSpring
+{
+public:
+	Vector		*m_pNode1;
+	Vector		*m_pNode2;
+};
+
+
+class CBaseRopePhysics : public CSimplePhysics::IHelper
+{
+public:
+	DECLARE_CLASS_NOBASE( CBaseRopePhysics );
+
+					CBaseRopePhysics( 
+						CSimplePhysics::CNode *pNodes, 
+						int nNodes, 
+						CRopeSpring *pSprings,
+						float *flSpringDistsSqr );
+
+	// nNodes should be less than or equal to what you passed into the constructor.
+	void			SetNumNodes( int nNodes );
+
+	// Restart timers and such.
+	void			Restart();
+
+	void			ResetSpringLength(float flSpringDist );
+	float			GetSpringLength() const;
+	void			ResetNodeSpringLength( int iStartNode, float flSpringDist );
+
+	// Set simulation parameters.
+	// If you pass in a delegate, you can be called to apply constraints.
+	void			SetupSimulation( float flSpringDist, CSimplePhysics::IHelper *pDelegate=0 );
+
+	// Set the physics delegate.
+	void			SetDelegate( CSimplePhysics::IHelper *pDelegate );
+
+	void			Simulate( float dt );
+	
+	int						NumNodes()				{ return m_nNodes; }
+	CSimplePhysics::CNode*	GetNode( int iNode )	{ return &m_pNodes[iNode]; }
+	CSimplePhysics::CNode*	GetFirstNode()			{ return &m_pNodes[0]; }
+	CSimplePhysics::CNode*	GetLastNode()			{ return &m_pNodes[ m_nNodes-1 ]; }
+
+
+
+public:
+
+	virtual void	GetNodeForces( CSimplePhysics::CNode *pNodes, int iNode, Vector *pAccel );
+	virtual void	ApplyConstraints( CSimplePhysics::CNode *pNodes, int nNodes );
+
+
+private:
+
+	int				NumSprings()	{return m_nNodes - 1;}
+
+
+protected:
+
+	CSimplePhysics::IHelper		*m_pDelegate;
+	
+	CSimplePhysics::CNode		*m_pNodes;
+	int				m_nNodes;
+
+	CRopeSpring		*m_pSprings;
+
+  	float			m_flSpringDist;
+  	float			m_flSpringDistSqr;
+
+	// Spring lengths per node
+	float			*m_flNodeSpringDistsSqr;
+
+	CSimplePhysics	m_Physics;
+};
+
+
+
+
+
+template< int NUM_NODES >
+class CRopePhysics : public CBaseRopePhysics
+{
+public:
+
+								CRopePhysics();
+
+	CSimplePhysics::CNode		m_Nodes[NUM_NODES];
+	CRopeSpring		m_Springs[NUM_NODES - 1];
+	float			m_SpringDistsSqr[NUM_NODES - 1];
+};
+
+
+template< int NUM_NODES >
+CRopePhysics<NUM_NODES>::CRopePhysics() : 
+	CBaseRopePhysics( m_Nodes, NUM_NODES, m_Springs, m_SpringDistsSqr )
+{
+}
+
+
+#endif // ROPE_PHYSICS_H