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502 lines
14 KiB
C++
502 lines
14 KiB
C++
//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $Workfile: $
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// $Date: $
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// $NoKeywords: $
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//=============================================================================//
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#include <stdio.h>
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#include <memory.h>
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#include <math.h>
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#include <string.h>
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typedef unsigned char byte;
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#pragma warning(disable:4244)
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#include "tier0/dbg.h"
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#include "mathlib/vector.h"
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#include "keyframe.h"
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#include "mathlib/mathlib.h"
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#include "rope_shared.h"
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// memdbgon must be the last include file in a .cpp file!!!
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#include "tier0/memdbgon.h"
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//-----------------------------------------------------------------------------
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//
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// Implementation of keyframe.h interface
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//
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Key Frames
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//-----------------------------------------------------------------------------
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#define HIGHEST_KEYFRAME 3
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#define LOWEST_KEYFRAME -3
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#define TOTAL_KEYFRAMES (HIGHEST_KEYFRAME - LOWEST_KEYFRAME + 1)
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//
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struct KeyFrame_t
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{
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Vector vPos;
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Quaternion qRot;
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};
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KeyFrame_t g_KeyFrames[ TOTAL_KEYFRAMES ];
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KeyFrame_t *g_KeyFramePtr = &g_KeyFrames[ -LOWEST_KEYFRAME ]; // points to the middle keyframe, keyframe 0
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bool Motion_SetKeyAngles( int keyNum, Quaternion &quatAngles )
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{
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if ( keyNum > HIGHEST_KEYFRAME || keyNum < LOWEST_KEYFRAME )
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return false;
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g_KeyFramePtr[keyNum].qRot = quatAngles;
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return true;
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}
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Time Modifier function enumeration & implementation
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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typedef float (*TimeModifierFunc_t)(float);
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typedef struct
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{
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const char *szName;
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TimeModifierFunc_t pFunc;
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} TimeModifier_t;
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float TimeModifierFunc_Linear( float time )
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{
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return time;
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}
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float TimeModifierFunc_Cosine( float time )
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{
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return ( cos((time+1) * M_PI) * 0.5 ) + 0.5;
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}
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float TimeModifierFunc_TimeSquared( float time )
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{
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return (time * time);
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}
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TimeModifier_t g_TimeModifiers[] =
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{
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{ "Linear", TimeModifierFunc_Linear },
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{ "Accel/Deaccel (cosine)", TimeModifierFunc_Cosine },
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{ "Accel (time*time)", TimeModifierFunc_TimeSquared },
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};
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int Motion_GetNumberOfTimeModifiers( void )
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{
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return ARRAYSIZE(g_TimeModifiers);
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}
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bool Motion_GetTimeModifierDetails( int timeInterpNum, const char **outName )
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{
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if ( timeInterpNum < 0 || timeInterpNum >= Motion_GetNumberOfTimeModifiers() )
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{
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return false;
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}
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if ( !g_TimeModifiers[0].szName || !g_TimeModifiers[0].pFunc )
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{
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return false;
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}
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if ( outName )
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*outName = g_TimeModifiers[0].szName;
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return true;
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}
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//-----------------------------------------------------------------------------
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// Purpose:
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// Input : time -
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// timeModifierFuncNum -
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// *outNewTime -
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// Output : Returns true on success, false on failure.
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//-----------------------------------------------------------------------------
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bool Motion_CalculateModifiedTime( float time, int timeModifierFuncNum, float *outNewTime )
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{
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*outNewTime = g_TimeModifiers[timeModifierFuncNum].pFunc( time );
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return true;
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}
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Position interpolator function enumeration & implementation
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// ------------------------------------------------------------------------------------ //
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// Linear position interpolator.
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// ------------------------------------------------------------------------------------ //
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class CPositionInterpolator_Linear : public IPositionInterpolator
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{
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public:
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virtual void Release();
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virtual void GetDetails( char **outName, int *outMinKeyReq, int *outMaxKeyReq );
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virtual void SetKeyPosition( int keyNum, Vector const &vPos );
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virtual void InterpolatePosition( float time, Vector &vOut );
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virtual bool ProcessKey( char const *pName, char const *pValue ) { return false; }
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};
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CPositionInterpolator_Linear g_LinearInterpolator;
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IPositionInterpolator* GetLinearInterpolator()
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{
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return &g_LinearInterpolator;
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}
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void CPositionInterpolator_Linear::Release()
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{
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}
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void CPositionInterpolator_Linear::GetDetails( char **outName, int *outMinKeyReq, int *outMaxKeyReq )
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{
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*outName = "Linear";
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*outMinKeyReq = 0;
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*outMaxKeyReq = 1;
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}
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void CPositionInterpolator_Linear::SetKeyPosition( int keyNum, Vector const &vPos )
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{
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Assert ( keyNum <= HIGHEST_KEYFRAME && keyNum >= LOWEST_KEYFRAME );
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VectorCopy( vPos, g_KeyFramePtr[keyNum].vPos );
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}
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void CPositionInterpolator_Linear::InterpolatePosition( float time, Vector &vOut )
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{
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VectorLerp( g_KeyFramePtr[0].vPos, g_KeyFramePtr[1].vPos, time, vOut );
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}
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// ------------------------------------------------------------------------------------ //
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// Catmull-Rom position interpolator.
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// ------------------------------------------------------------------------------------ //
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class CPositionInterpolator_CatmullRom : public IPositionInterpolator
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{
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public:
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virtual void Release();
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virtual void GetDetails( char **outName, int *outMinKeyReq, int *outMaxKeyReq );
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virtual void SetKeyPosition( int keyNum, Vector const &vPos );
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virtual void InterpolatePosition( float time, Vector &vOut );
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virtual bool ProcessKey( char const *pName, char const *pValue ) { return false; }
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};
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CPositionInterpolator_CatmullRom g_CatmullRomInterpolator;
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IPositionInterpolator* GetCatmullRomInterpolator()
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{
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return &g_CatmullRomInterpolator;
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}
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void CPositionInterpolator_CatmullRom::Release()
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{
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}
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void CPositionInterpolator_CatmullRom::GetDetails( char **outName, int *outMinKeyReq, int *outMaxKeyReq )
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{
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*outName = "Catmull-Rom Spline";
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*outMinKeyReq = -1;
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*outMaxKeyReq = 2;
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}
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void CPositionInterpolator_CatmullRom::SetKeyPosition( int keyNum, Vector const &vPos )
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{
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Assert ( keyNum <= HIGHEST_KEYFRAME && keyNum >= LOWEST_KEYFRAME );
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VectorCopy( vPos, g_KeyFramePtr[keyNum].vPos );
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}
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void CPositionInterpolator_CatmullRom::InterpolatePosition( float time, Vector &vOut )
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{
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Catmull_Rom_Spline(
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g_KeyFramePtr[-1].vPos,
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g_KeyFramePtr[0].vPos,
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g_KeyFramePtr[1].vPos,
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g_KeyFramePtr[2].vPos,
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time,
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vOut );
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}
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// ------------------------------------------------------------------------------------ //
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// Rope interpolator.
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// ------------------------------------------------------------------------------------ //
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#include "rope_physics.h"
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class CRopeDelegate : public CSimplePhysics::IHelper
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{
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public:
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virtual void GetNodeForces( CSimplePhysics::CNode *pNodes, int iNode, Vector *pAccel );
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virtual void ApplyConstraints( CSimplePhysics::CNode *pNodes, int nNodes );
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public:
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Vector m_CurEndPoints[2];
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};
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void CRopeDelegate::GetNodeForces( CSimplePhysics::CNode *pNodes, int iNode, Vector *pAccel )
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{
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// Gravity.
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pAccel->Init( 0, 0, -1500 );
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}
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void CRopeDelegate::ApplyConstraints( CSimplePhysics::CNode *pNodes, int nNodes )
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{
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if( nNodes >= 2 )
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{
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pNodes[0].m_vPos = m_CurEndPoints[0];
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pNodes[nNodes-1].m_vPos = m_CurEndPoints[1];
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}
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}
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class CPositionInterpolator_Rope : public IPositionInterpolator
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{
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public:
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CPositionInterpolator_Rope();
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virtual void Release();
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virtual void GetDetails( char **outName, int *outMinKeyReq, int *outMaxKeyReq );
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virtual void SetKeyPosition( int keyNum, Vector const &vPos );
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virtual void InterpolatePosition( float time, Vector &vOut );
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virtual bool ProcessKey( char const *pName, char const *pValue );
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private:
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CRopePhysics<10> m_RopePhysics;
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CRopeDelegate m_Delegate;
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float m_flSlack; // Extra length of rope.
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bool m_bChange;
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int m_nSegments;
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};
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IPositionInterpolator* GetRopeInterpolator()
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{
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return new CPositionInterpolator_Rope;
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}
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CPositionInterpolator_Rope::CPositionInterpolator_Rope()
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{
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m_flSlack = 0;
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m_bChange = false;
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m_nSegments = 5;
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for( int i=0; i < 2; i++ )
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m_Delegate.m_CurEndPoints[i] = Vector( 1e16, 1e16, 1e16 );
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}
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void CPositionInterpolator_Rope::Release()
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{
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delete this;
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}
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void CPositionInterpolator_Rope::GetDetails( char **outName, int *outMinKeyReq, int *outMaxKeyReq )
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{
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*outName = "Rope";
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*outMinKeyReq = 0;
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*outMinKeyReq = 1;
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}
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void CPositionInterpolator_Rope::SetKeyPosition( int keyNum, Vector const &vPos )
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{
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if( keyNum == 0 || keyNum == 1 )
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{
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if( vPos != m_Delegate.m_CurEndPoints[keyNum] )
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m_bChange = true;
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m_Delegate.m_CurEndPoints[keyNum] = vPos;
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}
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}
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void CPositionInterpolator_Rope::InterpolatePosition( float time, Vector &vOut )
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{
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// Check if we need to resimulate..
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if( m_bChange )
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{
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m_RopePhysics.SetNumNodes( m_nSegments );
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// Init all the nodes.
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for( int i=0; i < m_RopePhysics.NumNodes(); i++ )
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m_RopePhysics.GetNode(i)->m_vPos = m_RopePhysics.GetNode(i)->m_vPrevPos = m_Delegate.m_CurEndPoints[0];
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float flDist = (m_Delegate.m_CurEndPoints[0] - m_Delegate.m_CurEndPoints[1]).Length();
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flDist += m_flSlack;
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m_RopePhysics.Restart();
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m_RopePhysics.SetupSimulation( flDist / (m_RopePhysics.NumNodes() - 1), &m_Delegate );
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// Run the simulation for a while to let the rope settle down..
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m_RopePhysics.Simulate( 5 );
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m_bChange = false;
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}
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// Ok, now we have all the nodes setup..
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float flNode = time * (m_RopePhysics.NumNodes()-1);
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int iNode = (int)( flNode );
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VectorLerp(
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m_RopePhysics.GetNode(iNode)->m_vPredicted,
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m_RopePhysics.GetNode(iNode+1)->m_vPredicted,
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flNode - iNode,
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vOut );
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}
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bool CPositionInterpolator_Rope::ProcessKey( char const *pName, char const *pValue )
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{
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if( stricmp( pName, "Slack" ) == 0 )
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{
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m_flSlack = atof( pValue ) + ROPESLACK_FUDGEFACTOR;
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m_bChange = true;
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return true;
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}
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else if( stricmp( pName, "Type" ) == 0 )
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{
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int iType = atoi( pValue );
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if( iType == 0 )
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m_nSegments = ROPE_MAX_SEGMENTS;
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else if( iType == 1 )
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m_nSegments = ROPE_TYPE1_NUMSEGMENTS;
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else
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m_nSegments = ROPE_TYPE2_NUMSEGMENTS;
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m_bChange = true;
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return true;
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}
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return false;
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}
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// ------------------------------------------------------------------------------------ //
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// The global table of all the position interpolators.
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// ------------------------------------------------------------------------------------ //
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typedef IPositionInterpolator* (*PositionInterpolatorCreateFn)();
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PositionInterpolatorCreateFn g_PositionInterpolatorCreateFns[] =
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{
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GetLinearInterpolator,
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GetCatmullRomInterpolator,
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GetRopeInterpolator
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};
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int Motion_GetNumberOfPositionInterpolators( void )
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{
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return ARRAYSIZE(g_PositionInterpolatorCreateFns);
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}
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IPositionInterpolator* Motion_GetPositionInterpolator( int interpNum )
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{
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Assert( interpNum >= 0 && interpNum < Motion_GetNumberOfPositionInterpolators() );
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return g_PositionInterpolatorCreateFns[clamp( interpNum, 0, Motion_GetNumberOfPositionInterpolators() - 1 )]();
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}
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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// Rotation interpolator function enumeration & implementation
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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typedef void (*RotationInterpolatorFunc_t)(float time, Quaternion &outRot);
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typedef struct
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{
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char *szName;
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RotationInterpolatorFunc_t pFunc;
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// defines the range of keys this interpolator needs to function
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int iMinReqKeyFrame;
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int iMaxReqKeyFrame;
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} RotationInterpolator_t;
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void RotationInterpolatorFunc_Linear( float time, Quaternion &outRot )
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{
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// basic 4D spherical linear interpolation
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QuaternionSlerp( g_KeyFramePtr[0].qRot, g_KeyFramePtr[1].qRot, time, outRot );
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}
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RotationInterpolator_t g_RotationInterpolators[] =
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{
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{ "Linear", RotationInterpolatorFunc_Linear, 0, 1 },
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};
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int Motion_GetNumberOfRotationInterpolators( void )
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{
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return ARRAYSIZE(g_RotationInterpolators);
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}
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bool Motion_GetRotationInterpolatorDetails( int rotInterpNum, char **outName, int *outMinKeyReq, int *outMaxKeyReq )
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{
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if ( rotInterpNum < 0 || rotInterpNum >= Motion_GetNumberOfRotationInterpolators() )
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{
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return false;
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}
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if ( !g_RotationInterpolators[rotInterpNum].szName || !g_RotationInterpolators[rotInterpNum].pFunc )
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{
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return false;
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}
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if ( outName )
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*outName = g_RotationInterpolators[rotInterpNum].szName;
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if ( outMinKeyReq )
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*outMinKeyReq = g_RotationInterpolators[rotInterpNum].iMinReqKeyFrame;
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if ( outMaxKeyReq )
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*outMaxKeyReq = g_RotationInterpolators[rotInterpNum].iMaxReqKeyFrame;
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return true;
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}
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//-----------------------------------------------------------------------------
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// Purpose: Interpolates a rotation
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// Time is assumed to have already been modified by the TimeModifyFunc (above)
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// Requires the keyframes be already set
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// Input : time - value from 0..1
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// interpFuncNum -
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// *outQuatRotation - result in quaternion form
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// Output : Returns true on success, false on failure.
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//-----------------------------------------------------------------------------
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bool Motion_InterpolateRotation( float time, int interpFuncNum, Quaternion &outQuatRotation )
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{
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if ( time < 0.0f || time > 1.0f )
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return false;
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g_RotationInterpolators[interpFuncNum].pFunc( time, outQuatRotation );
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return true;
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}
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