diff options
Diffstat (limited to 'distrib/sdl-1.2.15/src/audio/SDL_mixer_m68k.c')
| -rw-r--r-- | distrib/sdl-1.2.15/src/audio/SDL_mixer_m68k.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/distrib/sdl-1.2.15/src/audio/SDL_mixer_m68k.c b/distrib/sdl-1.2.15/src/audio/SDL_mixer_m68k.c new file mode 100644 index 0000000..22bb1cb --- /dev/null +++ b/distrib/sdl-1.2.15/src/audio/SDL_mixer_m68k.c @@ -0,0 +1,210 @@ +/* + SDL - Simple DirectMedia Layer + Copyright (C) 1997-2012 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(__m68k__) && !defined(__mcoldfire__)) && 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 |