SimShapeFilterWrapper.h

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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
// SPDX-FileCopyrightText: 2024 Jorrit Rouwe
// SPDX-License-Identifier: MIT
 
#pragma once
 
#include <Jolt/Physics/Collision/SimShapeFilter.h>
#include <Jolt/Physics/Body/Body.h>
 
JPH_NAMESPACE_BEGIN
 
class SimShapeFilterWrapper : public ShapeFilter
{
public:
                            SimShapeFilterWrapper(const SimShapeFilter *inFilter, const Body *inBody1) :
        mFilter(inFilter),
        mBody1(inBody1)
    {
    }
 
    virtual bool            ShouldCollide(const Shape *inShape1, const SubShapeID &inSubShapeIDOfShape1, const Shape *inShape2, const SubShapeID &inSubShapeIDOfShape2) const override
    {
        return mFilter->ShouldCollide(*mBody1, inShape1, inSubShapeIDOfShape1, *mBody2, inShape2, inSubShapeIDOfShape2);
    }
 
    virtual bool            ShouldCollide(const Shape *inShape2, const SubShapeID &inSubShapeIDOfShape2) const override
    {
        return mFilter->ShouldCollide(*mBody1, mBody1->GetShape(), SubShapeID(), *mBody2, inShape2, inSubShapeIDOfShape2);
    }
 
    void                    SetBody2(const Body *inBody2)
    {
        mBody2 = inBody2;
    }
 
private:
    const SimShapeFilter *  mFilter;
    const Body *            mBody1;
    const Body *            mBody2;
};
 
union SimShapeFilterWrapperUnion
{
public:
                            SimShapeFilterWrapperUnion(const SimShapeFilter *inFilter, const Body *inBody1)
    {
        // Dirty trick: if we don't have a filter, placement new a standard ShapeFilter so that we
        // don't have to check for nullptr in the ShouldCollide function
        if (inFilter != nullptr)
            new (&mSimShapeFilterWrapper) SimShapeFilterWrapper(inFilter, inBody1);
        else
            new (&mSimShapeFilterWrapper) ShapeFilter();
    }
 
                            ~SimShapeFilterWrapperUnion()
    {
        // Doesn't need to be destructed
    }
 
    SimShapeFilterWrapper & GetSimShapeFilterWrapper()
    {
        return mSimShapeFilterWrapper;
    }
 
private:
    SimShapeFilterWrapper   mSimShapeFilterWrapper;
    ShapeFilter             mShapeFilter;
};
 
JPH_NAMESPACE_END