opensim/OpenSim/Region/Physics/BulletSPlugin/BSConstraint.cs

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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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using System;
using System.Collections.Generic;
using System.Text;
using OpenMetaverse;

namespace OpenSim.Region.Physics.BulletSPlugin
{

public abstract class BSConstraint : IDisposable
{
    private static string LogHeader = "[BULLETSIM CONSTRAINT]";

    protected BulletWorld m_world;
    protected BSScene PhysicsScene;
    protected BulletBody m_body1;
    protected BulletBody m_body2;
    protected BulletConstraint m_constraint;
    protected bool m_enabled = false;

    public BulletBody Body1 { get { return m_body1; } }
    public BulletBody Body2 { get { return m_body2; } }
    public BulletConstraint Constraint { get { return m_constraint; } }
    public abstract ConstraintType Type { get; }
    public bool IsEnabled { get { return m_enabled; } }

    public BSConstraint(BulletWorld world)
    {
        m_world = world;
        PhysicsScene = m_world.physicsScene;
    }

    public virtual void Dispose()
    {
        if (m_enabled)
        {
            m_enabled = false;
            if (m_constraint.HasPhysicalConstraint)
            {
                bool success = PhysicsScene.PE.DestroyConstraint(m_world, m_constraint);
                m_world.physicsScene.DetailLog("{0},BSConstraint.Dispose,taint,id1={1},body1={2},id2={3},body2={4},success={5}",
                                    BSScene.DetailLogZero,
                                    m_body1.ID, m_body1.AddrString,
                                    m_body2.ID, m_body2.AddrString,
                                    success);
                m_constraint.Clear();
            }
        }
    }

    public virtual bool SetLinearLimits(Vector3 low, Vector3 high)
    {
        bool ret = false;
        if (m_enabled)
            ret = PhysicsScene.PE.SetLinearLimits(m_constraint, low, high);
        return ret;
    }

    public virtual bool SetAngularLimits(Vector3 low, Vector3 high)
    {
        bool ret = false;
        if (m_enabled)
        {
            ret = PhysicsScene.PE.SetAngularLimits(m_constraint, low, high);
        }
        return ret;
    }

    public virtual bool SetSolverIterations(float cnt)
    {
        bool ret = false;
        if (m_enabled)
        {
            PhysicsScene.PE.SetConstraintNumSolverIterations(m_constraint, cnt);
            ret = true;
        }
        return ret;
    }

    public virtual bool CalculateTransforms()
    {
        bool ret = false;
        if (m_enabled)
        {
            // Recompute the internal transforms
            PhysicsScene.PE.CalculateTransforms(m_constraint);
            ret = true;
        }
        return ret;
    }

    // Reset this constraint making sure it has all its internal structures
    //    recomputed and is enabled and ready to go.
    public virtual bool RecomputeConstraintVariables(float mass)
    {
        bool ret = false;
        if (m_enabled)
        {
            ret = CalculateTransforms();
            if (ret)
            {
                // Setting an object's mass to zero (making it static like when it's selected)
                //     automatically disables the constraints.
                // If the link is enabled, be sure to set the constraint itself to enabled.
                PhysicsScene.PE.SetConstraintEnable(m_constraint, BSParam.NumericBool(true));
            }
            else
            {
                m_world.physicsScene.Logger.ErrorFormat("{0} CalculateTransforms failed. A={1}, B={2}", LogHeader, Body1.ID, Body2.ID);
            }
        }
        return ret;
    }
}
}