diff options
Diffstat (limited to 'distrib/sdl-1.2.12/src/audio/SDL_mixer_m68k.c')
| -rw-r--r-- | distrib/sdl-1.2.12/src/audio/SDL_mixer_m68k.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/distrib/sdl-1.2.12/src/audio/SDL_mixer_m68k.c b/distrib/sdl-1.2.12/src/audio/SDL_mixer_m68k.c deleted file mode 100644 index f8786da..0000000 --- a/distrib/sdl-1.2.12/src/audio/SDL_mixer_m68k.c +++ /dev/null @@ -1,211 +0,0 @@ -/* - SDL - Simple DirectMedia Layer - Copyright (C) 1997-2004 Sam Lantinga - - 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 - Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - - Sam Lantinga - slouken@libsdl.org -*/ -#include "SDL_config.h" - -/* - m68k assembly mix routines - - Patrice Mandin -*/ - -#if defined(__M68000__) && defined(__GNUC__) -void SDL_MixAudio_m68k_U8(char* dst, char* src, long len, long volume, char* mix8) -{ - __asm__ __volatile__ ( - - "tstl %2\n" -" beqs stoploop_u8\n" -"mixloop_u8:\n" - - /* Mix a sample */ - -" moveq #0,%%d0\n" -" moveq #0,%%d1\n" - -" moveb %1@+,%%d0\n" /* d0 = *src++ */ -" sub #128,%%d0\n" /* d0 -= 128 */ -" muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */ -" moveb %0@,%%d1\n" /* d1 = *dst */ -" asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */ -" add #128,%%d0\n" /* d0 += 128 */ - -" add %%d1,%%d0\n" - -" moveb %4@(%%d0:w),%0@+\n" - - /* Loop till done */ - -" subql #1,%2\n" -" bhis mixloop_u8\n" -"stoploop_u8:\n" - - : /* no return value */ - : /* input */ - "a"(dst), "a"(src), "d"(len), "d"(volume), "a"(mix8) - : /* clobbered registers */ - "d0", "d1", "cc", "memory" - ); -} - -void SDL_MixAudio_m68k_S8(char* dst, char* src, long len, long volume) -{ - __asm__ __volatile__ ( - - "tstl %2\n" -" beqs stoploop_s8\n" -" moveq #-128,%%d2\n" -" moveq #127,%%d3\n" -"mixloop_s8:\n" - - /* Mix a sample */ - -" moveq #0,%%d0\n" -" moveq #0,%%d1\n" - -" moveb %1@+,%%d0\n" /* d0 = *src++ */ -" muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */ -" moveb %0@,%%d1\n" /* d1 = *dst */ -" asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */ - -" add %%d1,%%d0\n" - -" cmp %%d2,%%d0\n" -" bges lower_limit_s8\n" -" move %%d2,%%d0\n" -"lower_limit_s8:\n" - -" cmp %%d3,%%d0\n" -" bles upper_limit_s8\n" -" move %%d3,%%d0\n" -"upper_limit_s8:\n" -" moveb %%d0,%0@+\n" - - /* Loop till done */ - -" subql #1,%2\n" -" bhis mixloop_s8\n" -"stoploop_s8:\n" - - : /* no return value */ - : /* input */ - "a"(dst), "a"(src), "d"(len), "d"(volume) - : /* clobbered registers */ - "d0", "d1", "d2", "d3", "cc", "memory" - ); -} - -void SDL_MixAudio_m68k_S16MSB(short* dst, short* src, long len, long volume) -{ - __asm__ __volatile__ ( - - "tstl %2\n" -" beqs stoploop_s16msb\n" -" movel #-32768,%%d2\n" -" movel #32767,%%d3\n" -" lsrl #1,%2\n" -"mixloop_s16msb:\n" - - /* Mix a sample */ - -" move %1@+,%%d0\n" /* d0 = *src++ */ -" muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */ -" move %0@,%%d1\n" /* d1 = *dst */ -" extl %%d1\n" /* extend d1 to 32 bits */ -" asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */ - -" addl %%d1,%%d0\n" - -" cmpl %%d2,%%d0\n" -" bges lower_limit_s16msb\n" -" move %%d2,%%d0\n" -"lower_limit_s16msb:\n" - -" cmpl %%d3,%%d0\n" -" bles upper_limit_s16msb\n" -" move %%d3,%%d0\n" -"upper_limit_s16msb:\n" -" move %%d0,%0@+\n" - - /* Loop till done */ - -" subql #1,%2\n" -" bhis mixloop_s16msb\n" -"stoploop_s16msb:\n" - - : /* no return value */ - : /* input */ - "a"(dst), "a"(src), "d"(len), "d"(volume) - : /* clobbered registers */ - "d0", "d1", "d2", "d3", "cc", "memory" - ); -} - -void SDL_MixAudio_m68k_S16LSB(short* dst, short* src, long len, long volume) -{ - __asm__ __volatile__ ( - - "tstl %2\n" -" beqs stoploop_s16lsb\n" -" movel #-32768,%%d2\n" -" movel #32767,%%d3\n" -" lsrl #1,%2\n" -"mixloop_s16lsb:\n" - - /* Mix a sample */ - -" move %1@+,%%d0\n" /* d0 = *src++ */ -" rorw #8,%%d0\n" -" muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */ -" move %0@,%%d1\n" /* d1 = *dst */ -" rorw #8,%%d1\n" -" extl %%d1\n" /* extend d1 to 32 bits */ -" asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */ - -" addl %%d1,%%d0\n" - -" cmpl %%d2,%%d0\n" -" bges lower_limit_s16lsb\n" -" move %%d2,%%d0\n" -"lower_limit_s16lsb:\n" - -" cmpl %%d3,%%d0\n" -" bles upper_limit_s16lsb\n" -" move %%d3,%%d0\n" -"upper_limit_s16lsb:\n" -" rorw #8,%%d0\n" -" move %%d0,%0@+\n" - - /* Loop till done */ - -" subql #1,%2\n" -" bhis mixloop_s16lsb\n" -"stoploop_s16lsb:\n" - - : /* no return value */ - : /* input */ - "a"(dst), "a"(src), "d"(len), "d"(volume) - : /* clobbered registers */ - "d0", "d1", "d2", "d3", "cc", "memory" - ); -} -#endif - |