#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.
*/

/** @file PtexPlatform.h
    @brief Platform-specific classes, functions, and includes.
*/

// 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>
#include <tchar.h> 
#include <process.h>

#else

// linux/unix/posix
#include <stdlib.h>
#if !defined(__FreeBSD__) && !defined(__OpenBSD__)
#include <alloca.h>
#endif
#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

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
