scummvm-cursorfix/engines/hpl1/engine/impl/PhysicsJointSliderNewton.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/*
 * Copyright (C) 2006-2010 - Frictional Games
 *
 * This file is part of HPL1 Engine.
 */

#include "hpl1/engine/impl/PhysicsJointSliderNewton.h"

#include "hpl1/engine/impl/PhysicsBodyNewton.h"
#include "hpl1/engine/impl/PhysicsWorldNewton.h"

#include "common/str.h"
#include "hpl1/engine/system/low_level_system.h"

namespace hpl {

//////////////////////////////////////////////////////////////////////////
// CONSTRUCTORS
//////////////////////////////////////////////////////////////////////////

//-----------------------------------------------------------------------

cPhysicsJointSliderNewton::cPhysicsJointSliderNewton(const tString &asName,
													 iPhysicsBody *apParentBody, iPhysicsBody *apChildBody,
													 iPhysicsWorld *apWorld, const cVector3f &avPivotPoint, const cVector3f avPinDir)
	: iPhysicsJointNewton<iPhysicsJointSlider>(asName, apParentBody, apChildBody, apWorld, avPivotPoint) {
	mvPin = avPinDir;
	mvPin.Normalise();

	const float fPivotPoint[3] = {avPivotPoint.x, avPivotPoint.y, avPivotPoint.z};
	const float fPinDir[3] = {avPinDir.x, avPinDir.y, avPinDir.z};
	mpNewtonJoint = NewtonConstraintCreateSlider(mpNewtonWorld, fPivotPoint, fPinDir, mpNewtonChildBody,
												 mpNewtonParentBody);
	NewtonJointSetUserData(mpNewtonJoint, (void *)this);
	NewtonSliderSetUserCallback(mpNewtonJoint, LimitCallback);

	mfMaxDistance = 0;
	mfMinDistance = 0;

	mvPinDir = avPinDir;
	mvPivotPoint = avPivotPoint;
}

//-----------------------------------------------------------------------

cPhysicsJointSliderNewton::~cPhysicsJointSliderNewton() {
}

//-----------------------------------------------------------------------

//////////////////////////////////////////////////////////////////////////
// PUBLIC METHODS
//////////////////////////////////////////////////////////////////////////

//-----------------------------------------------------------------------

void cPhysicsJointSliderNewton::SetMaxDistance(float afX) {
	mfMaxDistance = afX;
	// fixes a problem with the crane in level 11 (new storage room) not updating
	// after the the limits have been changed, preventing it from moving
	if (mpChildBody && Common::String(msName.c_str()).contains("crane"))
		mpChildBody->AddImpulse({0.001f, 0.001f, 0.001f});
}
void cPhysicsJointSliderNewton::SetMinDistance(float afX) {
	mfMinDistance = afX;
}
float cPhysicsJointSliderNewton::GetMaxDistance() {
	return mfMaxDistance;
}
float cPhysicsJointSliderNewton::GetMinDistance() {
	return mfMinDistance;
}

//-----------------------------------------------------------------------

cVector3f cPhysicsJointSliderNewton::GetVelocity() {
	float fSpeed = NewtonSliderGetJointVeloc(mpNewtonJoint);
	return mvPin * fSpeed;
}
cVector3f cPhysicsJointSliderNewton::GetAngularVelocity() {
	return cVector3f(0, 0, 0);
}
cVector3f cPhysicsJointSliderNewton::GetForce() {
	cVector3f vForce;
	NewtonSliderGetJointForce(mpNewtonJoint, &vForce.x);
	return vForce;
}

//-----------------------------------------------------------------------

float cPhysicsJointSliderNewton::GetDistance() {
	return NewtonSliderGetJointPosit(mpNewtonJoint);
}
float cPhysicsJointSliderNewton::GetAngle() {
	return 0;
}

//-----------------------------------------------------------------------

//////////////////////////////////////////////////////////////////////////
// STATIC CALLBACKS
//////////////////////////////////////////////////////////////////////////

//-----------------------------------------------------------------------

unsigned cPhysicsJointSliderNewton::LimitCallback(const NewtonJoint *pSlider, NewtonHingeSliderUpdateDesc *pDesc) {
	cPhysicsJointSliderNewton *pSliderJoint = (cPhysicsJointSliderNewton *)NewtonJointGetUserData(pSlider);

	// pSliderJoint->OnPhysicsUpdate();

	float fDistance = NewtonSliderGetJointPosit(pSlider);
	// Log("Dist: %f\n",fDistance);

	if (pSliderJoint->mfMinDistance == 0 && pSliderJoint->mfMaxDistance == 0)
		return 0;

	// Avoid oscillation
	CheckLimitAutoSleep(pSliderJoint, pSliderJoint->mfMinDistance, pSliderJoint->mfMaxDistance, fDistance);

	if (fDistance < pSliderJoint->mfMinDistance) {
		pSliderJoint->OnMinLimit();

		pDesc->m_accel = NewtonSliderCalculateStopAccel(pSlider, pDesc, pSliderJoint->mfMinDistance);
		pDesc->m_minFriction = 0;

		// Log("Under Min. Acc: %f Dist %f\n",pDesc->m_accel,fDistance);

		return 1;
	} else if (fDistance > pSliderJoint->mfMaxDistance) {
		pSliderJoint->OnMaxLimit();

		pDesc->m_accel = NewtonSliderCalculateStopAccel(pSlider, pDesc, pSliderJoint->mfMaxDistance);
		pDesc->m_maxFriction = 0;

		// Log("Over Max. Acc: %f Dist %f\n",pDesc->m_accel,fDistance);
		return 1;
	} else {
		if (pSliderJoint->mpParentBody == NULL || pSliderJoint->mpParentBody->GetMass() == 0) {
			if ((pSliderJoint->mfStickyMaxDistance != 0 &&
				 fabs(fDistance - pSliderJoint->mfMaxDistance) < pSliderJoint->mfStickyMaxDistance) ||
				(pSliderJoint->mfStickyMinDistance != 0 &&
				 fabs(fDistance - pSliderJoint->mfMinDistance) < pSliderJoint->mfStickyMinDistance)) {
				pSliderJoint->mpChildBody->SetAngularVelocity(0);
				pSliderJoint->mpChildBody->SetLinearVelocity(0);
			}
		}

		pSliderJoint->OnNoLimit();
	}

	// Log("Nothing, Dist %f\n",fDistance);

	return 0;
}
//-----------------------------------------------------------------------

} // namespace hpl