/* GStreamer

 * Copyright (C) 2010 Tim-Philipp Müller <tim centricular net>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#ifndef __GST_MATH_COMPAT_H__

#define __GST_MATH_COMPAT_H__

/* This header is not included automatically via gst/gst.h, you need to

 * include it explicitly if you need it. */

#ifndef _USE_MATH_DEFINES

#define _USE_MATH_DEFINES /* so MSVC defines M_PI etc. */

#endif

#include <math.h>

#include <glib.h>

G_BEGIN_DECLS

/* http://en.wikipedia.org/wiki/Math.h */

#define __GST_MATH_COMPAT_NEED_RINT

#define __GST_MATH_COMPAT_NEED_RINTF

#define __GST_MATH_COMPAT_NEED_ISNAN

#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L

#undef __GST_MATH_COMPAT_NEED_RINT

#undef __GST_MATH_COMPAT_NEED_RINTF

#undef __GST_MATH_COMPAT_NEED_ISNAN

#endif

#if defined(_POSIX_VERSION) && _POSIX_VERSION >= 200112L

#undef __GST_MATH_COMPAT_NEED_RINT

#undef __GST_MATH_COMPAT_NEED_RINTF

#undef __GST_MATH_COMPAT_NEED_ISNAN

#endif

#ifndef M_PI

#define M_PI G_PI

#endif

#ifndef M_PI_2

#define M_PI_2 G_PI_2

#endif

#ifndef M_PI_4

#define M_PI_4 G_PI_4

#endif

static inline double

__gst_math_compat_rint (double x)

{

  return floor (x + 0.5);

}

static inline float

__gst_math_compat_rintf (float x)

{

  return floorf (x + 0.5);

}

static inline gboolean

__gst_math_compat_isnan (double x)

{

  return x != x;

}

#if defined (__GST_MATH_COMPAT_NEED_RINT) && !defined (rint)

#define rint(x) __gst_math_compat_rint(x)

#endif

#if defined (__GST_MATH_COMPAT_NEED_RINTF) && !defined (rintf)

#define rintf(x) __gst_math_compat_rintf(x)

#endif

#if defined (__GST_MATH_COMPAT_NEED_ISNAN) && !defined (isnan)

#define isnan(x) __gst_math_compat_isnan (x)

#endif

#ifndef NAN

#if G_BYTE_ORDER == G_BIG_ENDIAN

#define __GST_NAN_BYTES        { 0x7f, 0xc0, 0, 0 }

#elif G_BYTE_ORDER == G_LITTLE_ENDIAN

#define __GST_NAN_BYTES        { 0, 0, 0xc0, 0x7f }

#endif

static union {

  unsigned char __c[4];

  float __d;

} __gst_nan_union G_GNUC_UNUSED = {

  __GST_NAN_BYTES

};

#define NAN    (__gst_nan_union.__d)

#endif

G_END_DECLS

#endif /* __GST_MATH_COMPAT_H__ */