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lib/haxebullet/bullet/BulletDynamics/ConstraintSolver/btSolverBody.h

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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.
+*/
+
+#ifndef BT_SOLVER_BODY_H
+#define BT_SOLVER_BODY_H
+
+class	btRigidBody;
+#include "LinearMath/btVector3.h"
+#include "LinearMath/btMatrix3x3.h"
+
+#include "LinearMath/btAlignedAllocator.h"
+#include "LinearMath/btTransformUtil.h"
+
+///Until we get other contributions, only use SIMD on Windows, when using Visual Studio 2008 or later, and not double precision
+#ifdef BT_USE_SSE
+#define USE_SIMD 1
+#endif //
+
+
+#ifdef USE_SIMD
+
+struct	btSimdScalar
+{
+	SIMD_FORCE_INLINE	btSimdScalar()
+	{
+
+	}
+
+	SIMD_FORCE_INLINE	btSimdScalar(float	fl)
+	:m_vec128 (_mm_set1_ps(fl))
+	{
+	}
+
+	SIMD_FORCE_INLINE	btSimdScalar(__m128 v128)
+		:m_vec128(v128)
+	{
+	}
+	union
+	{
+		__m128		m_vec128;
+		float		m_floats[4];
+		int			m_ints[4];
+		btScalar	m_unusedPadding;
+	};
+	SIMD_FORCE_INLINE	__m128	get128()
+	{
+		return m_vec128;
+	}
+
+	SIMD_FORCE_INLINE	const __m128	get128() const
+	{
+		return m_vec128;
+	}
+
+	SIMD_FORCE_INLINE	void	set128(__m128 v128)
+	{
+		m_vec128 = v128;
+	}
+
+	SIMD_FORCE_INLINE	operator       __m128()       
+	{ 
+		return m_vec128; 
+	}
+	SIMD_FORCE_INLINE	operator const __m128() const 
+	{ 
+		return m_vec128; 
+	}
+	
+	SIMD_FORCE_INLINE	operator float() const 
+	{ 
+		return m_floats[0]; 
+	}
+
+};
+
+///@brief Return the elementwise product of two btSimdScalar
+SIMD_FORCE_INLINE btSimdScalar 
+operator*(const btSimdScalar& v1, const btSimdScalar& v2) 
+{
+	return btSimdScalar(_mm_mul_ps(v1.get128(),v2.get128()));
+}
+
+///@brief Return the elementwise product of two btSimdScalar
+SIMD_FORCE_INLINE btSimdScalar 
+operator+(const btSimdScalar& v1, const btSimdScalar& v2) 
+{
+	return btSimdScalar(_mm_add_ps(v1.get128(),v2.get128()));
+}
+
+
+#else
+#define btSimdScalar btScalar
+#endif
+
+///The btSolverBody is an internal datastructure for the constraint solver. Only necessary data is packed to increase cache coherence/performance.
+ATTRIBUTE_ALIGNED16 (struct)	btSolverBody
+{
+	BT_DECLARE_ALIGNED_ALLOCATOR();
+	btTransform		m_worldTransform;
+	btVector3		m_deltaLinearVelocity;
+	btVector3		m_deltaAngularVelocity;
+	btVector3		m_angularFactor;
+	btVector3		m_linearFactor;
+	btVector3		m_invMass;
+	btVector3		m_pushVelocity;
+	btVector3		m_turnVelocity;
+	btVector3		m_linearVelocity;
+	btVector3		m_angularVelocity;
+	btVector3		m_externalForceImpulse;
+	btVector3		m_externalTorqueImpulse;
+
+	btRigidBody*	m_originalBody;
+	void	setWorldTransform(const btTransform& worldTransform)
+	{
+		m_worldTransform = worldTransform;
+	}
+
+	const btTransform& getWorldTransform() const
+	{
+		return m_worldTransform;
+	}
+	
+	
+
+	SIMD_FORCE_INLINE void	getVelocityInLocalPointNoDelta(const btVector3& rel_pos, btVector3& velocity ) const
+	{
+		if (m_originalBody)
+			velocity = m_linearVelocity + m_externalForceImpulse + (m_angularVelocity+m_externalTorqueImpulse).cross(rel_pos);
+		else
+			velocity.setValue(0,0,0);
+	}
+
+
+	SIMD_FORCE_INLINE void	getVelocityInLocalPointObsolete(const btVector3& rel_pos, btVector3& velocity ) const
+	{
+		if (m_originalBody)
+			velocity = m_linearVelocity+m_deltaLinearVelocity + (m_angularVelocity+m_deltaAngularVelocity).cross(rel_pos);
+		else
+			velocity.setValue(0,0,0);
+	}
+
+	SIMD_FORCE_INLINE void	getAngularVelocity(btVector3& angVel) const
+	{
+		if (m_originalBody)
+			angVel =m_angularVelocity+m_deltaAngularVelocity;
+		else
+			angVel.setValue(0,0,0);
+	}
+
+
+	//Optimization for the iterative solver: avoid calculating constant terms involving inertia, normal, relative position
+	SIMD_FORCE_INLINE void applyImpulse(const btVector3& linearComponent, const btVector3& angularComponent,const btScalar impulseMagnitude)
+	{
+		if (m_originalBody)
+		{
+			m_deltaLinearVelocity += linearComponent*impulseMagnitude*m_linearFactor;
+			m_deltaAngularVelocity += angularComponent*(impulseMagnitude*m_angularFactor);
+		}
+	}
+
+	SIMD_FORCE_INLINE void internalApplyPushImpulse(const btVector3& linearComponent, const btVector3& angularComponent,btScalar impulseMagnitude)
+	{
+		if (m_originalBody)
+		{
+			m_pushVelocity += linearComponent*impulseMagnitude*m_linearFactor;
+			m_turnVelocity += angularComponent*(impulseMagnitude*m_angularFactor);
+		}
+	}
+
+
+
+	const btVector3& getDeltaLinearVelocity() const
+	{
+		return m_deltaLinearVelocity;
+	}
+
+	const btVector3& getDeltaAngularVelocity() const
+	{
+		return m_deltaAngularVelocity;
+	}
+
+	const btVector3& getPushVelocity() const 
+	{
+		return m_pushVelocity;
+	}
+
+	const btVector3& getTurnVelocity() const 
+	{
+		return m_turnVelocity;
+	}
+
+
+	////////////////////////////////////////////////
+	///some internal methods, don't use them
+		
+	btVector3& internalGetDeltaLinearVelocity()
+	{
+		return m_deltaLinearVelocity;
+	}
+
+	btVector3& internalGetDeltaAngularVelocity()
+	{
+		return m_deltaAngularVelocity;
+	}
+
+	const btVector3& internalGetAngularFactor() const
+	{
+		return m_angularFactor;
+	}
+
+	const btVector3& internalGetInvMass() const
+	{
+		return m_invMass;
+	}
+
+	void internalSetInvMass(const btVector3& invMass)
+	{
+		m_invMass = invMass;
+	}
+	
+	btVector3& internalGetPushVelocity()
+	{
+		return m_pushVelocity;
+	}
+
+	btVector3& internalGetTurnVelocity()
+	{
+		return m_turnVelocity;
+	}
+
+	SIMD_FORCE_INLINE void	internalGetVelocityInLocalPointObsolete(const btVector3& rel_pos, btVector3& velocity ) const
+	{
+		velocity = m_linearVelocity+m_deltaLinearVelocity + (m_angularVelocity+m_deltaAngularVelocity).cross(rel_pos);
+	}
+
+	SIMD_FORCE_INLINE void	internalGetAngularVelocity(btVector3& angVel) const
+	{
+		angVel = m_angularVelocity+m_deltaAngularVelocity;
+	}
+
+
+	//Optimization for the iterative solver: avoid calculating constant terms involving inertia, normal, relative position
+	SIMD_FORCE_INLINE void internalApplyImpulse(const btVector3& linearComponent, const btVector3& angularComponent,const btScalar impulseMagnitude)
+	{
+		if (m_originalBody)
+		{
+			m_deltaLinearVelocity += linearComponent*impulseMagnitude*m_linearFactor;
+			m_deltaAngularVelocity += angularComponent*(impulseMagnitude*m_angularFactor);
+		}
+	}
+		
+	
+	
+
+	void	writebackVelocity()
+	{
+		if (m_originalBody)
+		{
+			m_linearVelocity +=m_deltaLinearVelocity;
+			m_angularVelocity += m_deltaAngularVelocity;
+			
+			//m_originalBody->setCompanionId(-1);
+		}
+	}
+
+
+	void	writebackVelocityAndTransform(btScalar timeStep, btScalar splitImpulseTurnErp)
+	{
+        (void) timeStep;
+		if (m_originalBody)
+		{
+			m_linearVelocity += m_deltaLinearVelocity;
+			m_angularVelocity += m_deltaAngularVelocity;
+			
+			//correct the position/orientation based on push/turn recovery
+			btTransform newTransform;
+			if (m_pushVelocity[0]!=0.f || m_pushVelocity[1]!=0 || m_pushVelocity[2]!=0 || m_turnVelocity[0]!=0.f || m_turnVelocity[1]!=0 || m_turnVelocity[2]!=0)
+			{
+			//	btQuaternion orn = m_worldTransform.getRotation();
+				btTransformUtil::integrateTransform(m_worldTransform,m_pushVelocity,m_turnVelocity*splitImpulseTurnErp,timeStep,newTransform);
+				m_worldTransform = newTransform;
+			}
+			//m_worldTransform.setRotation(orn);
+			//m_originalBody->setCompanionId(-1);
+		}
+	}
+	
+
+
+};
+
+#endif //BT_SOLVER_BODY_H
+
+