env.h
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上传日期:2007-06-06
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文件大小:4k
- /* ***** BEGIN LICENSE BLOCK *****
- * Version: RCSL 1.0/RPSL 1.0
- *
- * Portions Copyright (c) 1995-2002 RealNetworks, Inc. All Rights Reserved.
- *
- * The contents of this file, and the files included with this file, are
- * subject to the current version of the RealNetworks Public Source License
- * Version 1.0 (the "RPSL") available at
- * http://www.helixcommunity.org/content/rpsl unless you have licensed
- * the file under the RealNetworks Community Source License Version 1.0
- * (the "RCSL") available at http://www.helixcommunity.org/content/rcsl,
- * in which case the RCSL will apply. You may also obtain the license terms
- * directly from RealNetworks. You may not use this file except in
- * compliance with the RPSL or, if you have a valid RCSL with RealNetworks
- * applicable to this file, the RCSL. Please see the applicable RPSL or
- * RCSL for the rights, obligations and limitations governing use of the
- * contents of the file.
- *
- * This file is part of the Helix DNA Technology. RealNetworks is the
- * developer of the Original Code and owns the copyrights in the portions
- * it created.
- *
- * This file, and the files included with this file, is distributed and made
- * available on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND REALNETWORKS HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- *
- * Technology Compatibility Kit Test Suite(s) Location:
- * http://www.helixcommunity.org/content/tck
- *
- * Contributor(s):
- *
- * ***** END LICENSE BLOCK ***** */
- /* standard libraries: */
- #include "hlxclib/limits.h"
- #include "hlxclib/string.h"
- #include "hlxclib/math.h"
- /* some math. constants: */
- #ifndef M_PI
- #define M_PI 3.14159265358979323846
- #endif
- #ifndef M_SQRT2
- #define M_SQRT2 1.41421356237309504880
- #endif
- /* fast rounding to a nearest integer: */
- #if defined(_M_IX86) && !defined(WINCE_EMULATOR)
- static __inline int NEAREST_INT(double a)
- {
- int ia;
- __asm fld a
- __asm fistp ia
- return ia;
- }
- #elif defined(__i386) && defined(__linux__)
- static __inline int NEAREST_INT(double a)
- {
- int ia;
- __asm__ __volatile__ (
- " fldl %1; "
- " fistpl %0; "
- : "=m"(ia)
- : "m"(a)
- : "memory", "st"
- );
-
- return ia;
- }
- #else
- #define NEAREST_INT(a) ((int) (((a)<0)? ((a)-0.5): ((a)+0.5)))
- #endif
- /* byte packing: */
- #ifdef __linux__
- #include <endian.h>
- #endif
- #ifndef BYTE_ORDER
- #define LITTLE_ENDIAN 1234
- #define BIG_ENDIAN 4321
- /* make sure your system is being correctly identified here !!! */
- #if defined(ultrix) || defined(__alpha) || defined(__i386__) || defined(__i486__) || defined(_X86_) || defined (_M_IX86)
- #define BYTE_ORDER LITTLE_ENDIAN
- #else
- #define BYTE_ORDER BIG_ENDIAN
- #endif
- #endif
- /* check platform specific constants: */
- #if CHAR_BIT != 8 || (defined( _INTEGRAL_MAX_BIT) && _INTEGRAL_MAX_BITS < 32)
- || (defined(WORD_BIT) && WORD_BIT < 32)
- #error Error!!! This code is written for 32+ bit processors.
- #endif
- #ifndef ENV_MAIN
- #define ENV_EXTERN extern
- #else
- #define ENV_EXTERN /**/
- #endif
- /* Intel MMX & SSE extensions: */
- #if (defined(_M_IX86) || defined(_USE_MMX_BLENDERS)) && !defined(WINCE_EMULATOR)
- ENV_EXTERN int _x86_MMX_Available;
- ENV_EXTERN int _x86_SSE_Available;
- #endif
- /* AltiVec extensions */
- #ifdef _MACINTOSH
- ENV_EXTERN int _AltiVec_Available;
- #endif