1 files changed, 261 insertions, 0 deletions
diff --git a/game/client/c_rope.h b/game/client/c_rope.h
new file mode 100644
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--- /dev/null
+++ b/game/client/c_rope.h
@@ -0,0 +1,261 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#ifndef C_ROPE_H
+#define C_ROPE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "c_baseentity.h"
+#include "rope_physics.h"
+#include "materialsystem/imaterial.h"
+#include "rope_shared.h"
+#include "bitvec.h"
+
+
+class KeyValues;
+class C_BaseAnimating;
+struct RopeSegData_t;
+
+#define MAX_ROPE_SUBDIVS		8
+#define MAX_ROPE_SEGMENTS		(ROPE_MAX_SEGMENTS+(ROPE_MAX_SEGMENTS-1)*MAX_ROPE_SUBDIVS)
+
+//=============================================================================
+class C_RopeKeyframe : public C_BaseEntity
+{
+public:
+
+	DECLARE_CLASS( C_RopeKeyframe, C_BaseEntity );
+	DECLARE_CLIENTCLASS();
+
+
+private:
+
+	class CPhysicsDelegate : public CSimplePhysics::IHelper
+	{
+	public:
+		virtual void	GetNodeForces( CSimplePhysics::CNode *pNodes, int iNode, Vector *pAccel );
+		virtual void	ApplyConstraints( CSimplePhysics::CNode *pNodes, int nNodes );
+	
+		C_RopeKeyframe	*m_pKeyframe;
+	};
+
+	friend class CPhysicsDelegate;
+
+
+public:
+
+					C_RopeKeyframe();
+					~C_RopeKeyframe();
+
+	// This can be used for client-only ropes.
+	static C_RopeKeyframe* Create(
+		C_BaseEntity *pStartEnt,
+		C_BaseEntity *pEndEnt,
+		int iStartAttachment=0,
+		int iEndAttachment=0,
+		float ropeWidth = 2,
+		const char *pMaterialName = "cable/cable",		// Note: whoever creates the rope must
+														// use PrecacheModel for whatever material
+														// it specifies here.
+		int numSegments = 5,
+		int ropeFlags = ROPE_SIMULATE
+		);
+
+	// Create a client-only rope and initialize it with the parameters from the KeyValues.
+	static C_RopeKeyframe* CreateFromKeyValues( C_BaseAnimating *pEnt, KeyValues *pValues );
+
+	// Find ropes (with both endpoints connected) that intersect this AABB. This is just an approximation.
+	static int GetRopesIntersectingAABB( C_RopeKeyframe **pRopes, int nMaxRopes, const Vector &vAbsMin, const Vector &vAbsMax );
+
+	// Set the slack.
+	void SetSlack( int slack );
+
+	void SetRopeFlags( int flags );
+	int GetRopeFlags() const;
+
+	void SetupHangDistance( float flHangDist );
+
+	// Change which entities the rope is connected to.
+	void SetStartEntity( C_BaseEntity *pEnt );
+	void SetEndEntity( C_BaseEntity *pEnt );
+
+	C_BaseEntity* GetStartEntity() const;
+	C_BaseEntity* GetEndEntity() const;
+
+	// Hook the physics. Pass in your own implementation of CSimplePhysics::IHelper. The
+	// default implementation is returned so you can call through to it if you want.
+	CSimplePhysics::IHelper*	HookPhysics( CSimplePhysics::IHelper *pHook );
+
+	// Attach to things (you can also just lock the endpoints down yourself if you hook the physics).
+
+	// Client-only right now. This could be moved to the server if there was a good reason.
+	void			SetColorMod( const Vector &vColorMod );
+
+	// Use this when rope length and slack change to recompute the spring length.
+	void			RecomputeSprings();
+
+	void ShakeRope( const Vector &vCenter, float flRadius, float flMagnitude );
+
+	// Get the attachment position of one of the endpoints.
+	bool			GetEndPointPos( int iPt, Vector &vPos );
+
+	// Get the rope material data.
+	IMaterial		*GetSolidMaterial( void );
+	IMaterial		*GetBackMaterial( void );
+
+	struct BuildRopeQueuedData_t
+	{
+		Vector	*m_pPredictedPositions;
+		Vector	*m_pLightValues;
+		int		m_iNodeCount;
+		Vector	m_vColorMod;
+		float	m_RopeLength;
+		float	m_Slack;
+	};
+
+	void			BuildRope( RopeSegData_t *pRopeSegment, const Vector &vCurrentViewForward, const Vector &vCurrentViewOrigin, BuildRopeQueuedData_t *pQueuedData, bool bQueued );
+
+// C_BaseEntity overrides.
+public:
+
+	virtual void	OnDataChanged( DataUpdateType_t updateType );
+	virtual void	ClientThink();
+	virtual int		DrawModel( int flags );
+	virtual bool	ShouldDraw();
+	virtual const Vector& WorldSpaceCenter() const;
+
+	// Specify ROPE_ATTACHMENT_START_POINT or ROPE_ATTACHMENT_END_POINT for the attachment.
+	virtual	bool	GetAttachment( int number, Vector &origin, QAngle &angles );
+	virtual bool	GetAttachment( int number, matrix3x4_t &matrix );
+	virtual bool	GetAttachment( int number, Vector &origin );
+	virtual bool	GetAttachmentVelocity( int number, Vector &originVel, Quaternion &angleVel );
+
+private:
+	
+	void			FinishInit( const char *pMaterialName );
+
+	void			RunRopeSimulation( float flSeconds );
+	Vector			ConstrainNode( const Vector &vNormal, const Vector &vNodePosition, const Vector &vMidpiont, float fNormalLength );
+	void			ConstrainNodesBetweenEndpoints( void );
+
+	bool			AnyPointsMoved();
+
+	bool			DidEndPointMove( int iPt );
+	bool			DetectRestingState( bool &bApplyWind );
+
+	void			UpdateBBox();
+	bool			InitRopePhysics();
+	
+	bool			GetEndPointAttachment( int iPt, Vector &vPos, QAngle &angle );
+	
+	Vector			*GetRopeSubdivVectors( int *nSubdivs );
+	void			CalcLightValues();
+
+	void			ReceiveMessage( int classID, bf_read &msg );
+	bool			CalculateEndPointAttachment( C_BaseEntity *pEnt, int iAttachment, Vector &vPos, QAngle *pAngles );
+
+
+private:
+	// Track which links touched something last frame. Used to prevent wind from gusting on them.
+	CBitVec<ROPE_MAX_SEGMENTS>		m_LinksTouchingSomething;
+	int								m_nLinksTouchingSomething;
+	bool							m_bApplyWind;
+	int								m_fPrevLockedPoints;	// Which points are locked down.
+	int								m_iForcePointMoveCounter;
+
+	// Used to control resting state.
+	bool			m_bPrevEndPointPos[2];
+	Vector			m_vPrevEndPointPos[2];
+
+	float			m_flCurScroll;		// for scrolling texture.
+	float			m_flScrollSpeed;
+
+	int				m_RopeFlags;			// Combo of ROPE_ flags.
+	int				m_iRopeMaterialModelIndex;	// Index of sprite model with the rope's material.
+		
+	CRopePhysics<ROPE_MAX_SEGMENTS>	m_RopePhysics;
+	Vector			m_LightValues[ROPE_MAX_SEGMENTS]; // light info when the rope is created.
+
+	int				m_nSegments;		// Number of segments.
+	
+	EHANDLE			m_hStartPoint;		// StartPoint/EndPoint are entities
+	EHANDLE			m_hEndPoint;
+	short			m_iStartAttachment;	// StartAttachment/EndAttachment are attachment points.
+	short			m_iEndAttachment;
+
+	unsigned char	m_Subdiv;			// Number of subdivions in between segments.
+
+	int				m_RopeLength;		// Length of the rope, used for tension.
+	int				m_Slack;			// Extra length the rope is given.
+	float			m_TextureScale;		// pixels per inch
+	
+	int				m_fLockedPoints;	// Which points are locked down.
+
+	float				m_Width;
+
+	CPhysicsDelegate	m_PhysicsDelegate;
+
+	IMaterial		*m_pMaterial;
+	IMaterial		*m_pBackMaterial;			// Optional translucent background material for the rope to help reduce aliasing.
+
+	int				m_TextureHeight;	// Texture height, for texture scale calculations.
+
+	// Instantaneous force
+	Vector			m_flImpulse;
+	Vector			m_flPreviousImpulse;
+
+	// Simulated wind gusts.
+	float			m_flCurrentGustTimer;
+	float			m_flCurrentGustLifetime;	// How long will the current gust last?
+
+	float			m_flTimeToNextGust;			// When will the next wind gust be?
+	Vector			m_vWindDir;					// What direction does the current gust go in?
+
+	Vector			m_vColorMod;				// Color modulation on all verts?
+
+	Vector			m_vCachedEndPointAttachmentPos[2];
+	QAngle			m_vCachedEndPointAttachmentAngle[2];
+
+	// In network table, can't bit-compress
+	bool			m_bConstrainBetweenEndpoints;	// Simulated segment points won't stretch beyond the endpoints
+
+	bool			m_bEndPointAttachmentPositionsDirty : 1;
+	bool			m_bEndPointAttachmentAnglesDirty : 1;
+	bool			m_bNewDataThisFrame : 1;			// Set to true in OnDataChanged so that we simulate that frame
+	bool			m_bPhysicsInitted : 1;				// It waits until all required entities are 
+	// present to start simulating and rendering.
+
+	friend class CRopeManager;
+};
+
+
+// Profiling info.
+void Rope_ResetCounters();
+//void Rope_ShowRSpeeds();
+
+//=============================================================================
+//
+// Rope Manager
+//
+abstract_class IRopeManager
+{
+public:
+	virtual						~IRopeManager() {}
+	virtual void				ResetRenderCache( void ) = 0;
+	virtual void				AddToRenderCache( C_RopeKeyframe *pRope ) = 0;
+	virtual void				DrawRenderCache( bool bShadowDepth ) = 0;
+	virtual void				OnRenderStart( void ) = 0;
+	virtual void				SetHolidayLightMode( bool bHoliday ) = 0;
+	virtual bool				IsHolidayLightMode( void ) = 0;
+	virtual int					GetHolidayLightStyle( void ) = 0;
+};
+
+IRopeManager *RopeManager();
+
+#endif // C_ROPE_H