ObjectLayerPairFilterMask.h

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// Jolt Physics Library (https://github.com/jrouwe/JoltPhysics)
// SPDX-FileCopyrightText: 2023 Jorrit Rouwe
// SPDX-License-Identifier: MIT
 
#pragma once
 
#include <Jolt/Physics/Collision/ObjectLayer.h>
 
JPH_NAMESPACE_BEGIN
 
class ObjectLayerPairFilterMask : public ObjectLayerPairFilter
{
public:
    JPH_OVERRIDE_NEW_DELETE
 
    static constexpr uint32 cNumBits = JPH_OBJECT_LAYER_BITS / 2;
    static constexpr uint32 cMask = (1 << cNumBits) - 1;
 
    static ObjectLayer      sGetObjectLayer(uint32 inGroup, uint32 inMask = cMask)
    {
        JPH_ASSERT((inGroup & ~cMask) == 0);
        JPH_ASSERT((inMask & ~cMask) == 0);
        return ObjectLayer((inGroup & cMask) | (inMask << cNumBits));
    }
 
    static inline uint32    sGetGroup(ObjectLayer inObjectLayer)
    {
        return uint32(inObjectLayer) & cMask;
    }
 
    static inline uint32    sGetMask(ObjectLayer inObjectLayer)
    {
        return uint32(inObjectLayer) >> cNumBits;
    }
 
    virtual bool            ShouldCollide(ObjectLayer inObject1, ObjectLayer inObject2) const override
    {
        return (sGetGroup(inObject1) & sGetMask(inObject2)) != 0
            && (sGetGroup(inObject2) & sGetMask(inObject1)) != 0;
    }
};
 
JPH_NAMESPACE_END