include/begin_code.h
author Ryan C. Gordon <icculus@icculus.org>
Tue, 27 Sep 2005 12:14:17 +0000
changeset 1147 b580f7201543
parent 1025 3652d111416c
child 1190 173c063d4f55
permissions -rw-r--r--
From: "Alex Volkov" <avcp-sdlmail@usa.net>
To: "'A list for developers using the SDL library. \(includesSDL-announce\)'" <sdl@libsdl.org>
Date: Mon, 19 Sep 2005 18:59:43 -0400
Subject: [SDL] [patch] Volume multiplier bug in

The volume multiplier in SDL_MixAudio_MMX_S8() is formed from the wrong
register.
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2004 Sam Lantinga
     4 
     5     This library is free software; you can redistribute it and/or
     6     modify it under the terms of the GNU Library General Public
     7     License as published by the Free Software Foundation; either
     8     version 2 of the License, or (at your option) any later version.
     9 
    10     This library is distributed in the hope that it will be useful,
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    13     Library General Public License for more details.
    14 
    15     You should have received a copy of the GNU Library General Public
    16     License along with this library; if not, write to the Free
    17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    18 
    19     Sam Lantinga
    20     slouken@libsdl.org
    21 */
    22 
    23 /* This file sets things up for C dynamic library function definitions,
    24    static inlined functions, and structures aligned at 4-byte alignment.
    25    If you don't like ugly C preprocessor code, don't look at this file. :)
    26 */
    27 
    28 /* This shouldn't be nested -- included it around code only. */
    29 #ifdef _begin_code_h
    30 #error Nested inclusion of begin_code.h
    31 #endif
    32 #define _begin_code_h
    33 
    34 /* Make sure the correct platform symbols are defined */
    35 #if !defined(WIN32) && defined(_WIN32)
    36 #define WIN32
    37 #endif /* Windows */
    38 
    39 /* Some compilers use a special export keyword */
    40 #ifndef DECLSPEC
    41 # ifdef __BEOS__
    42 #  if defined(__GNUC__)
    43 #   define DECLSPEC	__declspec(dllexport)
    44 #  else
    45 #   define DECLSPEC	__declspec(export)
    46 #  endif
    47 # else
    48 # ifdef WIN32
    49 #  ifdef __BORLANDC__
    50 #   ifdef BUILD_SDL
    51 #    define DECLSPEC 
    52 #   else
    53 #    define DECLSPEC __declspec(dllimport)
    54 #   endif
    55 #  else
    56 #   define DECLSPEC	__declspec(dllexport)
    57 #  endif
    58 # else
    59 #  define DECLSPEC
    60 # endif
    61 # endif
    62 #endif
    63 
    64 /* By default SDL uses the C calling convention */
    65 #ifndef SDLCALL
    66 #if defined(WIN32) && !defined(__GNUC__)
    67 #define SDLCALL __cdecl
    68 #else
    69 #define SDLCALL
    70 #endif
    71 #endif /* SDLCALL */
    72 
    73 /* Removed DECLSPEC on Symbian OS because SDL cannot be a DLL in EPOC */
    74 #ifdef __SYMBIAN32__ 
    75 #undef DECLSPEC
    76 #define DECLSPEC
    77 #endif /* __SYMBIAN32__ */
    78 
    79 /* Force structure packing at 4 byte alignment.
    80    This is necessary if the header is included in code which has structure
    81    packing set to an alternate value, say for loading structures from disk.
    82    The packing is reset to the previous value in close_code.h
    83  */
    84 #if defined(_MSC_VER) || defined(__MWERKS__) || defined(__BORLANDC__)
    85 #ifdef _MSC_VER
    86 #pragma warning(disable: 4103)
    87 #endif
    88 #ifdef __BORLANDC__
    89 #pragma nopackwarning
    90 #endif
    91 #pragma pack(push,4)
    92 #elif (defined(__MWERKS__) && defined(macintosh))
    93 #pragma options align=mac68k4byte
    94 #pragma enumsalwaysint on
    95 #endif /* Compiler needs structure packing set */
    96 
    97 /* Set up compiler-specific options for inlining functions */
    98 #ifndef SDL_INLINE_OKAY
    99 #ifdef __GNUC__
   100 #define SDL_INLINE_OKAY
   101 #else
   102 /* Add any special compiler-specific cases here */
   103 #if defined(_MSC_VER) || defined(__BORLANDC__) || \
   104     defined(__DMC__) || defined(__SC__) || \
   105     defined(__WATCOMC__) || defined(__LCC__) || \
   106     defined(__DECC)
   107 #ifndef __inline__
   108 #define __inline__	__inline
   109 #endif
   110 #define SDL_INLINE_OKAY
   111 #else
   112 #if !defined(__MRC__) && !defined(_SGI_SOURCE)
   113 #define __inline__ inline
   114 #define SDL_INLINE_OKAY
   115 #endif /* Not a funky compiler */
   116 #endif /* Visual C++ */
   117 #endif /* GNU C */
   118 #endif /* SDL_INLINE_OKAY */
   119 
   120 /* If inlining isn't supported, remove "__inline__", turning static
   121    inlined functions into static functions (resulting in code bloat
   122    in all files which include the offending header files)
   123 */
   124 #ifndef SDL_INLINE_OKAY
   125 #define __inline__
   126 #endif
   127 
   128 /* Apparently this is needed by several Windows compilers */
   129 #if !defined(__MACH__)
   130 #ifndef NULL
   131 #ifdef __cplusplus
   132 #define NULL 0
   133 #else
   134 #define NULL ((void *)0)
   135 #endif
   136 #endif /* NULL */
   137 #endif /* ! MacOS X - breaks precompiled headers */