src/video/math_private.h
author Sam Lantinga <slouken@libsdl.org>
Tue, 07 Feb 2006 10:40:14 +0000
changeset 1339 62802d9d7c87
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child 1344 2eed9997bd24
permissions -rw-r--r--
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/*
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 * ====================================================
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 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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 *
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 * Developed at SunPro, a Sun Microsystems, Inc. business.
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 * Permission to use, copy, modify, and distribute this
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 * software is freely granted, provided that this notice
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 * is preserved.
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 * ====================================================
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 */
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/*
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 * from: @(#)fdlibm.h 5.1 93/09/24
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 * $Id$
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 */
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#ifndef _MATH_PRIVATE_H_
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#define _MATH_PRIVATE_H_
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#include "SDL_endian.h"
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#define int32_t 	math_int32_t
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#define u_int32_t	math_u_int32_t
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typedef Sint32 math_int32_t;
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typedef Uint32 math_u_int32_t;
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/* The original fdlibm code used statements like:
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	n0 = ((*(int*)&one)>>29)^1;		* index of high word *
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	ix0 = *(n0+(int*)&x);			* high word of x *
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	ix1 = *((1-n0)+(int*)&x);		* low word of x *
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   to dig two 32 bit words out of the 64 bit IEEE floating point
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   value.  That is non-ANSI, and, moreover, the gcc instruction
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   scheduler gets it wrong.  We instead use the following macros.
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   Unlike the original code, we determine the endianness at compile
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   time, not at run time; I don't see much benefit to selecting
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   endianness at run time.  */
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/* A union which permits us to convert between a double and two 32 bit
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   ints.  */
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/*
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 * Math on arm is special:
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 * For FPA, float words are always big-endian.
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 * For VFP, floats words follow the memory system mode.
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 */
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#if (SDL_BYTEORDER == SDL_BIG_ENDIAN) || \
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    (!defined(__VFP_FP__) && (defined(__arm__) || defined(__thumb__)))
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typedef union
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{
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  double value;
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  struct
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  {
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    u_int32_t msw;
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    u_int32_t lsw;
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  } parts;
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} ieee_double_shape_type;
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#else
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typedef union
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{
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  double value;
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  struct
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  {
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    u_int32_t lsw;
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    u_int32_t msw;
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  } parts;
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} ieee_double_shape_type;
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#endif
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/* Get two 32 bit ints from a double.  */
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#define EXTRACT_WORDS(ix0,ix1,d)				\
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do {								\
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  ieee_double_shape_type ew_u;					\
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  ew_u.value = (d);						\
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  (ix0) = ew_u.parts.msw;					\
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  (ix1) = ew_u.parts.lsw;					\
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} while (0)
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/* Get the more significant 32 bit int from a double.  */
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#define GET_HIGH_WORD(i,d)					\
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do {								\
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  ieee_double_shape_type gh_u;					\
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  gh_u.value = (d);						\
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  (i) = gh_u.parts.msw;						\
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} while (0)
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/* Get the less significant 32 bit int from a double.  */
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#define GET_LOW_WORD(i,d)					\
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do {								\
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  ieee_double_shape_type gl_u;					\
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  gl_u.value = (d);						\
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  (i) = gl_u.parts.lsw;						\
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} while (0)
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/* Set a double from two 32 bit ints.  */
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#define INSERT_WORDS(d,ix0,ix1)					\
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do {								\
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  ieee_double_shape_type iw_u;					\
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  iw_u.parts.msw = (ix0);					\
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  iw_u.parts.lsw = (ix1);					\
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  (d) = iw_u.value;						\
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} while (0)
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/* Set the more significant 32 bits of a double from an int.  */
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#define SET_HIGH_WORD(d,v)					\
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do {								\
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  ieee_double_shape_type sh_u;					\
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  sh_u.value = (d);						\
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  sh_u.parts.msw = (v);						\
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  (d) = sh_u.value;						\
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} while (0)
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/* Set the less significant 32 bits of a double from an int.  */
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#define SET_LOW_WORD(d,v)					\
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do {								\
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  ieee_double_shape_type sl_u;					\
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  sl_u.value = (d);						\
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  sl_u.parts.lsw = (v);						\
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  (d) = sl_u.value;						\
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} while (0)
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/* A union which permits us to convert between a float and a 32 bit
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   int.  */
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typedef union
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{
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  float value;
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  u_int32_t word;
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} ieee_float_shape_type;
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/* Get a 32 bit int from a float.  */
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#define GET_FLOAT_WORD(i,d)					\
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do {								\
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  ieee_float_shape_type gf_u;					\
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  gf_u.value = (d);						\
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  (i) = gf_u.word;						\
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} while (0)
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/* Set a float from a 32 bit int.  */
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#define SET_FLOAT_WORD(d,i)					\
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do {								\
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  ieee_float_shape_type sf_u;					\
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  sf_u.word = (i);						\
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  (d) = sf_u.value;						\
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} while (0)
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#ifdef __STDC__
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static const double
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#else
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static double
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#endif
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zero    =  0.0,
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one	=  1.0,
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two	=  2.0,
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two53	=  9007199254740992.0,	/* 0x43400000, 0x00000000 */
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two54   =  1.80143985094819840000e+16, /* 0x43500000, 0x00000000 */
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twom54  =  5.55111512312578270212e-17, /* 0x3C900000, 0x00000000 */
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huge   = 1.0e+300,
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tiny   = 1.0e-300;
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#endif /* _MATH_PRIVATE_H_ */