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- +3 −1 src/audio/Makefile.am
- +17 −0 src/audio/SDL_mixer.c
- +210 −0 src/audio/SDL_mixer_m68k.c
- +35 −0 src/audio/SDL_mixer_m68k.h
| @@ -0,0 +1,210 @@ | ||
| /* | ||
| SDL - Simple DirectMedia Layer | ||
| Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 | ||
| */ | ||
|
|
||
| /* | ||
| 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 | ||
|
|
| @@ -0,0 +1,35 @@ | ||
| /* | ||
| SDL - Simple DirectMedia Layer | ||
| Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 | ||
| */ | ||
|
|
||
| /* | ||
| 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); | ||
| void SDL_MixAudio_m68k_S8(char* dst,char* src, long len, long volume); | ||
|
|
||
| void SDL_MixAudio_m68k_S16MSB(short* dst,short* src, long len, long volume); | ||
| void SDL_MixAudio_m68k_S16LSB(short* dst,short* src, long len, long volume); | ||
| #endif |