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# PtexImporter/ptex/PtexPlatform.h

    #ifndef PtexPlatform_h
    #define PtexPlatform_h
    #define PtexPlatform_h
    /*
    PTEX SOFTWARE
    Copyright 2009 Disney Enterprises, Inc.  All rights reserved

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

      * Redistributions of source code must retain the above copyright
        notice, this list of conditions and the following disclaimer.

      * Redistributions in binary form must reproduce the above copyright
        notice, this list of conditions and the following disclaimer in
        the documentation and/or other materials provided with the
        distribution.

      * The names "Disney", "Walt Disney Pictures", "Walt Disney Animation
        Studios" or the names of its contributors may NOT be used to
        endorse or promote products derived from this software without
        specific prior written permission from Walt Disney Pictures.

    Disclaimer: THIS SOFTWARE IS PROVIDED BY WALT DISNEY PICTURES AND
    CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
    BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS
    FOR A PARTICULAR PURPOSE, NONINFRINGEMENT AND TITLE ARE DISCLAIMED.
    IN NO EVENT SHALL WALT DISNEY PICTURES, THE COPYRIGHT HOLDER OR
    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND BASED ON ANY
    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
    */

    // platform-specific includes
    #if defined(_WIN32) || defined(_WINDOWS) || defined(_MSC_VER)
    #ifndef WINDOWS
    #define WINDOWS
    #endif
    #define _CRT_NONSTDC_NO_DEPRECATE 1
    #define _CRT_SECURE_NO_DEPRECATE 1
    #define NOMINMAX 1

    // windows - defined for both Win32 and Win64
    #include <Windows.h>
    #include <malloc.h>
    #include <io.h>

    #else

    // linux/unix/posix
    #include <stdlib.h>
    #include <string.h>
    #include <pthread.h>
    // OS for spinlock
    #ifdef __APPLE__
    #include <libkern/OSAtomic.h>
    #include <sys/types.h>
    #endif
    #endif

    // general includes
    #include <stdio.h>
    #include <math.h>
    #include <assert.h>

    // missing functions on Windows
    #ifdef WINDOWS
    #define snprintf sprintf_s
    #define strtok_r strtok_s
    typedef __int64 FilePos;
    #define fseeko _fseeki64
    #define ftello _ftelli64
    #define PATH_MAX MAX_PATH

    inline double log2(double x) {
        return log(x) * 1.4426950408889634;
    }

    #else
    typedef off_t FilePos;
    #endif

    namespace PtexInternal {

        /*
         * Mutex/SpinLock classes
         */

    #ifdef WINDOWS

        class _Mutex {
        public:
        _Mutex()       { _mutex = CreateMutex(NULL, FALSE, NULL); }
        ~_Mutex()      { CloseHandle(_mutex); }
        void lock()   { WaitForSingleObject(_mutex, INFINITE); }
        void unlock() { ReleaseMutex(_mutex); }
        private:
        HANDLE _mutex;
        };

        class _SpinLock {
        public:
        _SpinLock()    { InitializeCriticalSection(&_spinlock); }
        ~_SpinLock()   { DeleteCriticalSection(&_spinlock); }
        void lock()   { EnterCriticalSection(&_spinlock); }
        void unlock() { LeaveCriticalSection(&_spinlock); }
        private:
        CRITICAL_SECTION _spinlock;
        };

    #else
        // assume linux/unix/posix

        class _Mutex {
         public:
        _Mutex()      { pthread_mutex_init(&_mutex, 0); }
        ~_Mutex()     { pthread_mutex_destroy(&_mutex); }
        void lock()   { pthread_mutex_lock(&_mutex); }
        void unlock() { pthread_mutex_unlock(&_mutex); }
        private:
        pthread_mutex_t _mutex;
        };

    #ifdef __APPLE__
        class _SpinLock {
        public:
        _SpinLock()   { _spinlock = 0; }
        ~_SpinLock()  { }
        void lock()   { OSSpinLockLock(&_spinlock); }
        void unlock() { OSSpinLockUnlock(&_spinlock); }
        private:
        OSSpinLock _spinlock;
        };
    #else
        class _SpinLock {
        public:
        _SpinLock()   { pthread_spin_init(&_spinlock, PTHREAD_PROCESS_PRIVATE); }
        ~_SpinLock()  { pthread_spin_destroy(&_spinlock); }
        void lock()   { pthread_spin_lock(&_spinlock); }
        void unlock() { pthread_spin_unlock(&_spinlock); }
        private:
        pthread_spinlock_t _spinlock;
        };
    #endif // __APPLE__
    #endif
    }

    #endif // PtexPlatform_h