NVIDIA(R) PhysX(R) SDK 3.4 API Reference: PxStrideIterator.h Source File

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+00024 // NVIDIA Corporation.
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+00026 // Copyright (c) 2008-2016 NVIDIA Corporation. All rights reserved.
+00027 // Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
+00028 // Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
+00029 
+00030 #ifndef PXFOUNDATION_PXSTRIDEITERATOR_H
+00031 #define PXFOUNDATION_PXSTRIDEITERATOR_H
+00032 
+00033 #include "foundation/Px.h"
+00034 #include "foundation/PxAssert.h"
+00035 
+00040 #if !PX_DOXYGEN
+00041 namespace physx
+00042 {
+00043 #endif
+00044 
+00080 template <typename T>
+00081 class PxStrideIterator
+00082 {
+00083 
+00084 #if !PX_DOXYGEN
+00085     template <typename X>
+00086     struct StripConst
+00087     {
+00088         typedef X Type;
+00089     };
+00090 
+00091     template <typename X>
+00092     struct StripConst<const X>
+00093     {
+00094         typedef X Type;
+00095     };
+00096 #endif
+00097 
+00098   public:
+00107     explicit PX_INLINE PxStrideIterator(T* ptr = NULL, PxU32 stride = sizeof(T)) : mPtr(ptr), mStride(stride)
+00108     {
+00109         PX_ASSERT(mStride == 0 || sizeof(T) <= mStride);
+00110     }
+00111 
+00117     PX_INLINE PxStrideIterator(const PxStrideIterator<typename StripConst<T>::Type>& strideIterator)
+00118     : mPtr(strideIterator.ptr()), mStride(strideIterator.stride())
+00119     {
+00120         PX_ASSERT(mStride == 0 || sizeof(T) <= mStride);
+00121     }
+00122 
+00126     PX_INLINE T* ptr() const
+00127     {
+00128         return mPtr;
+00129     }
+00130 
+00134     PX_INLINE PxU32 stride() const
+00135     {
+00136         return mStride;
+00137     }
+00138 
+00142     PX_INLINE T& operator*() const
+00143     {
+00144         return *mPtr;
+00145     }
+00146 
+00150     PX_INLINE T* operator->() const
+00151     {
+00152         return mPtr;
+00153     }
+00154 
+00158     PX_INLINE T& operator[](unsigned int i) const
+00159     {
+00160         return *byteAdd(mPtr, i * stride());
+00161     }
+00162 
+00166     PX_INLINE PxStrideIterator& operator++()
+00167     {
+00168         mPtr = byteAdd(mPtr, stride());
+00169         return *this;
+00170     }
+00171 
+00175     PX_INLINE PxStrideIterator operator++(int)
+00176     {
+00177         PxStrideIterator tmp = *this;
+00178         mPtr = byteAdd(mPtr, stride());
+00179         return tmp;
+00180     }
+00181 
+00185     PX_INLINE PxStrideIterator& operator--()
+00186     {
+00187         mPtr = byteSub(mPtr, stride());
+00188         return *this;
+00189     }
+00190 
+00194     PX_INLINE PxStrideIterator operator--(int)
+00195     {
+00196         PxStrideIterator tmp = *this;
+00197         mPtr = byteSub(mPtr, stride());
+00198         return tmp;
+00199     }
+00200 
+00204     PX_INLINE PxStrideIterator operator+(unsigned int i) const
+00205     {
+00206         return PxStrideIterator(byteAdd(mPtr, i * stride()), stride());
+00207     }
+00208 
+00212     PX_INLINE PxStrideIterator operator-(unsigned int i) const
+00213     {
+00214         return PxStrideIterator(byteSub(mPtr, i * stride()), stride());
+00215     }
+00216 
+00220     PX_INLINE PxStrideIterator& operator+=(unsigned int i)
+00221     {
+00222         mPtr = byteAdd(mPtr, i * stride());
+00223         return *this;
+00224     }
+00225 
+00229     PX_INLINE PxStrideIterator& operator-=(unsigned int i)
+00230     {
+00231         mPtr = byteSub(mPtr, i * stride());
+00232         return *this;
+00233     }
+00234 
+00238     PX_INLINE int operator-(const PxStrideIterator& other) const
+00239     {
+00240         PX_ASSERT(isCompatible(other));
+00241         int byteDiff = static_cast<int>(reinterpret_cast<const PxU8*>(mPtr) - reinterpret_cast<const PxU8*>(other.mPtr));
+00242         return byteDiff / static_cast<int>(stride());
+00243     }
+00244 
+00248     PX_INLINE bool operator==(const PxStrideIterator& other) const
+00249     {
+00250         PX_ASSERT(isCompatible(other));
+00251         return mPtr == other.mPtr;
+00252     }
+00253 
+00257     PX_INLINE bool operator!=(const PxStrideIterator& other) const
+00258     {
+00259         PX_ASSERT(isCompatible(other));
+00260         return mPtr != other.mPtr;
+00261     }
+00262 
+00266     PX_INLINE bool operator<(const PxStrideIterator& other) const
+00267     {
+00268         PX_ASSERT(isCompatible(other));
+00269         return mPtr < other.mPtr;
+00270     }
+00271 
+00275     PX_INLINE bool operator>(const PxStrideIterator& other) const
+00276     {
+00277         PX_ASSERT(isCompatible(other));
+00278         return mPtr > other.mPtr;
+00279     }
+00280 
+00284     PX_INLINE bool operator<=(const PxStrideIterator& other) const
+00285     {
+00286         PX_ASSERT(isCompatible(other));
+00287         return mPtr <= other.mPtr;
+00288     }
+00289 
+00293     PX_INLINE bool operator>=(const PxStrideIterator& other) const
+00294     {
+00295         PX_ASSERT(isCompatible(other));
+00296         return mPtr >= other.mPtr;
+00297     }
+00298 
+00299   private:
+00300     PX_INLINE static T* byteAdd(T* ptr, PxU32 bytes)
+00301     {
+00302         return const_cast<T*>(reinterpret_cast<const T*>(reinterpret_cast<const PxU8*>(ptr) + bytes));
+00303     }
+00304 
+00305     PX_INLINE static T* byteSub(T* ptr, PxU32 bytes)
+00306     {
+00307         return const_cast<T*>(reinterpret_cast<const T*>(reinterpret_cast<const PxU8*>(ptr) - bytes));
+00308     }
+00309 
+00310     PX_INLINE bool isCompatible(const PxStrideIterator& other) const
+00311     {
+00312         int byteDiff = static_cast<int>(reinterpret_cast<const PxU8*>(mPtr) - reinterpret_cast<const PxU8*>(other.mPtr));
+00313         return (stride() == other.stride()) && (abs(byteDiff) % stride() == 0);
+00314     }
+00315 
+00316     T* mPtr;
+00317     PxU32 mStride;
+00318 };
+00319 
+00323 template <typename T>
+00324 PX_INLINE PxStrideIterator<T> operator+(int i, PxStrideIterator<T> it)
+00325 {
+00326     it += i;
+00327     return it;
+00328 }
+00329 
+00333 template <typename T>
+00334 PX_INLINE PxStrideIterator<T> PxMakeIterator(T* ptr, PxU32 stride = sizeof(T))
+00335 {
+00336     return PxStrideIterator<T>(ptr, stride);
+00337 }
+00338 
+00342 template <typename T>
+00343 PX_INLINE PxStrideIterator<const T> PxMakeIterator(const T* ptr, PxU32 stride = sizeof(T))
+00344 {
+00345     return PxStrideIterator<const T>(ptr, stride);
+00346 }
+00347 
+00348 #if !PX_DOXYGEN
+00349 } // namespace physx
+00350 #endif
+00351 
+00353 #endif // PXFOUNDATION_PXSTRIDEITERATOR_H
+