PxBase.h

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// Copyright (c) 2008-2022 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.  
 
#ifndef PX_BASE_H
#define PX_BASE_H
 
#include "foundation/PxFlags.h"
#include "common/PxSerialFramework.h"
#include "common/PxCollection.h"
#include "common/PxTypeInfo.h"
#include <string.h> // For strcmp
#include "foundation/PxAssert.h"
 
#if !PX_DOXYGEN
namespace physx
{
#endif
 
typedef PxU16 PxType;
 
struct PxBaseFlag
{   
    enum Enum
    {
        eOWNS_MEMORY    = (1<<0),
        eIS_RELEASABLE  = (1<<1)
    };
};
 
typedef PxFlags<PxBaseFlag::Enum, PxU16> PxBaseFlags;
PX_FLAGS_OPERATORS(PxBaseFlag::Enum, PxU16)
 
 
class PxBase
{
//= ATTENTION! =====================================================================================
// Changing the data layout of this class breaks the binary serialization format.  See comments for 
// PX_BINARY_SERIAL_VERSION.  If a modification is required, please adjust the getBinaryMetaData 
// function.  If the modification is made on a custom branch, please change PX_BINARY_SERIAL_VERSION
// accordingly.
//==================================================================================================
public:
    virtual     void                release()                                       = 0;
 
    virtual     const char*         getConcreteTypeName() const                     = 0;
 
    /* brief Implements dynamic cast functionality. 
 
    Example use:
    
    if(actor->is<PxRigidDynamic>()) {...}
 
    \return A pointer to the specified type if object matches, otherwise NULL
    */
    template<class T> T*            is()                                            { return typeMatch<T>() ? static_cast<T*>(this) : NULL; }
 
    /* brief Implements dynamic cast functionality for const objects. 
 
    Example use:
    
    if(actor->is<PxRigidDynamic>()) {...}
 
    \return A pointer to the specified type if object matches, otherwise NULL
    */
    template<class T> const T*      is() const                                      { return typeMatch<T>() ? static_cast<const T*>(this) : NULL; }
 
    PX_FORCE_INLINE PxType          getConcreteType() const                         { return mConcreteType; }
                
    PX_FORCE_INLINE void            setBaseFlag(PxBaseFlag::Enum flag, bool value)  { mBaseFlags = value ? mBaseFlags|flag : mBaseFlags&~flag; }
    
    PX_FORCE_INLINE void            setBaseFlags(PxBaseFlags inFlags)               { mBaseFlags = inFlags; }
    
    PX_FORCE_INLINE PxBaseFlags     getBaseFlags() const                            { return mBaseFlags; }
 
    virtual     bool                isReleasable() const                            { return mBaseFlags & PxBaseFlag::eIS_RELEASABLE; }
 
protected:
    PX_INLINE                       PxBase(PxType concreteType, PxBaseFlags baseFlags)
                                        : mConcreteType(concreteType), mBaseFlags(baseFlags), mBuiltInRefCount(1)   {}
 
    PX_INLINE                       PxBase(PxBaseFlags baseFlags) : mBaseFlags(baseFlags)
                                    {
                                        PX_ASSERT(mBuiltInRefCount == 1);
                                    }
    virtual                         ~PxBase()                                       {}
 
    virtual             bool        isKindOf(const char* superClass) const { return !::strcmp(superClass, "PxBase"); }
 
    template<class T>   bool        typeMatch() const
                                    {
                                        return PxU32(PxTypeInfo<T>::eFastTypeId)!=PxU32(PxConcreteType::eUNDEFINED) ? 
                                            PxU32(getConcreteType()) == PxU32(PxTypeInfo<T>::eFastTypeId) : isKindOf(PxTypeInfo<T>::name());
                                    }
 
private:
    friend              void        getBinaryMetaData_PxBase(PxOutputStream& stream);
 
protected:
                        PxType      mConcreteType;          // concrete type identifier - see PxConcreteType.
                        PxBaseFlags mBaseFlags;             // internal flags
                        PxU32       mBuiltInRefCount;
};
 
class PxRefCounted : public PxBase
{
public:
 
    virtual     void                release()                   = 0;
 
    virtual             PxU32       getReferenceCount() const   = 0;
 
    virtual             void        acquireReference()          = 0;
 
protected:
    virtual             void        onRefCountZero()    { delete this;  }
 
    PX_INLINE                       PxRefCounted(PxType concreteType, PxBaseFlags baseFlags) : PxBase(concreteType, baseFlags)  {}
    PX_INLINE                       PxRefCounted(PxBaseFlags baseFlags) : PxBase(baseFlags)                                     {}
    virtual                         ~PxRefCounted()                                                                             {}
    virtual             bool        isKindOf(const char* name) const { return !::strcmp("PxRefCounted", name) || PxBase::isKindOf(name); }
};
 
#if !PX_DOXYGEN
} // namespace physx
#endif
 
#endif