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PxGeometryHelpers.h

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#ifndef PX_PHYSICS_GEOMETRYHELPERS
#define PX_PHYSICS_GEOMETRYHELPERS

#include "common/PxPhysXCommonConfig.h"
#include "PxGeometry.h"
#include "PxBoxGeometry.h"
#include "PxSphereGeometry.h"
#include "PxCapsuleGeometry.h"
#include "PxPlaneGeometry.h"
#include "PxConvexMeshGeometry.h"
#include "PxHeightFieldGeometry.h"
#include "foundation/PxPlane.h"
#include "foundation/PxTransform.h"
#include "foundation/PxUnionCast.h"

#if !PX_DOXYGEN
namespace physx
{
#endif

PX_ALIGN_PREFIX(4)
class PxGeometryHolder
{
public:
    PX_FORCE_INLINE PxGeometryType::Enum getType() const
    {
        return any().getType();
    }

    PX_FORCE_INLINE PxGeometry& any()
    { 
        return *PxUnionCast<PxGeometry*>(&bytes.geometry); 
    }

    PX_FORCE_INLINE const PxGeometry& any() const 
    { 
        return *PxUnionCast<const PxGeometry*>(&bytes.geometry); 
    }

    PX_FORCE_INLINE PxSphereGeometry& sphere()
    {
        return get<PxSphereGeometry, PxGeometryType::eSPHERE>();
    }

    PX_FORCE_INLINE const PxSphereGeometry& sphere() const
    {
        return get<const PxSphereGeometry, PxGeometryType::eSPHERE>();
    }

    PX_FORCE_INLINE PxPlaneGeometry& plane()
    {
        return get<PxPlaneGeometry, PxGeometryType::ePLANE>();
    }

    PX_FORCE_INLINE const PxPlaneGeometry& plane() const
    {
        return get<const PxPlaneGeometry, PxGeometryType::ePLANE>();
    }

    PX_FORCE_INLINE PxCapsuleGeometry& capsule()
    {
        return get<PxCapsuleGeometry, PxGeometryType::eCAPSULE>();
    }

    PX_FORCE_INLINE const PxCapsuleGeometry& capsule() const
    {
        return get<const PxCapsuleGeometry, PxGeometryType::eCAPSULE>();
    }

    PX_FORCE_INLINE PxBoxGeometry& box()
    {
        return get<PxBoxGeometry, PxGeometryType::eBOX>();
    }

    PX_FORCE_INLINE const PxBoxGeometry& box() const
    {
        return get<const PxBoxGeometry, PxGeometryType::eBOX>();
    }

    PX_FORCE_INLINE PxConvexMeshGeometry& convexMesh()
    {
        return get<PxConvexMeshGeometry, PxGeometryType::eCONVEXMESH>();
    }

    PX_FORCE_INLINE const PxConvexMeshGeometry& convexMesh() const
    {
        return get<const PxConvexMeshGeometry, PxGeometryType::eCONVEXMESH>();
    }

    PX_FORCE_INLINE PxTriangleMeshGeometry& triangleMesh()
    {
        return get<PxTriangleMeshGeometry, PxGeometryType::eTRIANGLEMESH>();
    }

    PX_FORCE_INLINE const PxTriangleMeshGeometry& triangleMesh() const
    {
        return get<const PxTriangleMeshGeometry, PxGeometryType::eTRIANGLEMESH>();
    }

    PX_FORCE_INLINE PxHeightFieldGeometry& heightField()
    {
        return get<PxHeightFieldGeometry, PxGeometryType::eHEIGHTFIELD>();
    }

    PX_FORCE_INLINE const PxHeightFieldGeometry& heightField() const
    {
        return get<const PxHeightFieldGeometry, PxGeometryType::eHEIGHTFIELD>();
    }

    PX_FORCE_INLINE void storeAny(const PxGeometry& geometry)
    {
        PX_ASSERT_WITH_MESSAGE( (geometry.getType() >= PxGeometryType::eSPHERE) &&
                                (geometry.getType() < PxGeometryType::eGEOMETRY_COUNT),
                                "Unexpected GeometryType in PxGeometryHolder::storeAny");

        switch(geometry.getType())
        {
        case PxGeometryType::eSPHERE:       put<PxSphereGeometry>(geometry); break;
        case PxGeometryType::ePLANE:        put<PxPlaneGeometry>(geometry); break;
        case PxGeometryType::eCAPSULE:      put<PxCapsuleGeometry>(geometry); break;
        case PxGeometryType::eBOX:          put<PxBoxGeometry>(geometry); break;
        case PxGeometryType::eCONVEXMESH:   put<PxConvexMeshGeometry>(geometry); break;
        case PxGeometryType::eTRIANGLEMESH: put<PxTriangleMeshGeometry>(geometry); break;
        case PxGeometryType::eHEIGHTFIELD:  put<PxHeightFieldGeometry>(geometry); break;
        case PxGeometryType::eGEOMETRY_COUNT:
        case PxGeometryType::eINVALID:      break;
        }
    }

    PX_FORCE_INLINE PxGeometryHolder()                          {}
    PX_FORCE_INLINE PxGeometryHolder(const PxGeometry& geometry){ storeAny(geometry);   }

    private:
        template<typename T> void put(const PxGeometry& geometry)
        {
            static_cast<T&>(any()) = static_cast<const T&>(geometry);
        }

        template<typename T, PxGeometryType::Enum type> T& get()
        {
            PX_ASSERT(getType() == type);
            return static_cast<T&>(any());
        }

        template<typename T, PxGeometryType::Enum type> T& get() const
        {
            PX_ASSERT(getType() == type);
            return static_cast<T&>(any());
        }

    union {
        PxU8    geometry[sizeof(PxGeometry)];
        PxU8    box[sizeof(PxBoxGeometry)];
        PxU8    sphere[sizeof(PxSphereGeometry)];
        PxU8    capsule[sizeof(PxCapsuleGeometry)];
        PxU8    plane[sizeof(PxPlaneGeometry)];
        PxU8    convex[sizeof(PxConvexMeshGeometry)];
        PxU8    mesh[sizeof(PxTriangleMeshGeometry)];
        PxU8    heightfield[sizeof(PxHeightFieldGeometry)];
    } bytes;
}
PX_ALIGN_SUFFIX(4);




#if !PX_DOXYGEN
} // namespace physx
#endif

#endif

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