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Add m68k assembly mixing routines
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/* | ||
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 | ||
*/ | ||
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/* | ||
m68k assembly mix routines | ||
Patrice Mandin | ||
*/ | ||
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#if defined(__M68000__) && defined(__GNUC__) | ||
void SDL_MixAudio_m68k_U8(char* dst, char* src, long len, long volume, char* mix8) | ||
{ | ||
__asm__ __volatile__ ( | ||
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"tstl %2\n" | ||
" beqs stoploop_u8\n" | ||
"mixloop_u8:\n" | ||
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/* Mix a sample */ | ||
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" moveq #0,%%d0\n" | ||
" moveq #0,%%d1\n" | ||
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" 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 */ | ||
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" add %%d1,%%d0\n" | ||
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" moveb %4@(%%d0:w),%0@+\n" | ||
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/* Loop till done */ | ||
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" subql #1,%2\n" | ||
" bhis mixloop_u8\n" | ||
"stoploop_u8:\n" | ||
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: /* no return value */ | ||
: /* input */ | ||
"a"(dst), "a"(src), "d"(len), "d"(volume), "a"(mix8) | ||
: /* clobbered registers */ | ||
"d0", "d1", "cc", "memory" | ||
); | ||
} | ||
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void SDL_MixAudio_m68k_S8(char* dst, char* src, long len, long volume) | ||
{ | ||
__asm__ __volatile__ ( | ||
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"tstl %2\n" | ||
" beqs stoploop_s8\n" | ||
" moveq #-128,%%d2\n" | ||
" moveq #127,%%d3\n" | ||
"mixloop_s8:\n" | ||
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/* Mix a sample */ | ||
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" moveq #0,%%d0\n" | ||
" moveq #0,%%d1\n" | ||
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" 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) */ | ||
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" add %%d1,%%d0\n" | ||
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" cmp %%d2,%%d0\n" | ||
" bges lower_limit_s8\n" | ||
" move %%d2,%%d0\n" | ||
"lower_limit_s8:\n" | ||
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" cmp %%d3,%%d0\n" | ||
" bles upper_limit_s8\n" | ||
" move %%d3,%%d0\n" | ||
"upper_limit_s8:\n" | ||
" moveb %%d0,%0@+\n" | ||
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/* Loop till done */ | ||
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" subql #1,%2\n" | ||
" bhis mixloop_s8\n" | ||
"stoploop_s8:\n" | ||
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: /* no return value */ | ||
: /* input */ | ||
"a"(dst), "a"(src), "d"(len), "d"(volume) | ||
: /* clobbered registers */ | ||
"d0", "d1", "d2", "d3", "cc", "memory" | ||
); | ||
} | ||
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void SDL_MixAudio_m68k_S16MSB(short* dst, short* src, long len, long volume) | ||
{ | ||
__asm__ __volatile__ ( | ||
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"tstl %2\n" | ||
" beqs stoploop_s16msb\n" | ||
" movel #-32768,%%d2\n" | ||
" movel #32767,%%d3\n" | ||
" lsrl #1,%2\n" | ||
"mixloop_s16msb:\n" | ||
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/* Mix a sample */ | ||
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" 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) */ | ||
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" addl %%d1,%%d0\n" | ||
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" cmpl %%d2,%%d0\n" | ||
" bges lower_limit_s16msb\n" | ||
" move %%d2,%%d0\n" | ||
"lower_limit_s16msb:\n" | ||
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" cmpl %%d3,%%d0\n" | ||
" bles upper_limit_s16msb\n" | ||
" move %%d3,%%d0\n" | ||
"upper_limit_s16msb:\n" | ||
" move %%d0,%0@+\n" | ||
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/* Loop till done */ | ||
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" subql #1,%2\n" | ||
" bhis mixloop_s16msb\n" | ||
"stoploop_s16msb:\n" | ||
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: /* no return value */ | ||
: /* input */ | ||
"a"(dst), "a"(src), "d"(len), "d"(volume) | ||
: /* clobbered registers */ | ||
"d0", "d1", "d2", "d3", "cc", "memory" | ||
); | ||
} | ||
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void SDL_MixAudio_m68k_S16LSB(short* dst, short* src, long len, long volume) | ||
{ | ||
__asm__ __volatile__ ( | ||
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"tstl %2\n" | ||
" beqs stoploop_s16lsb\n" | ||
" movel #-32768,%%d2\n" | ||
" movel #32767,%%d3\n" | ||
" lsrl #1,%2\n" | ||
"mixloop_s16lsb:\n" | ||
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/* Mix a sample */ | ||
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" 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) */ | ||
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" addl %%d1,%%d0\n" | ||
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" cmpl %%d2,%%d0\n" | ||
" bges lower_limit_s16lsb\n" | ||
" move %%d2,%%d0\n" | ||
"lower_limit_s16lsb:\n" | ||
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" 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" | ||
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/* Loop till done */ | ||
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" subql #1,%2\n" | ||
" bhis mixloop_s16lsb\n" | ||
"stoploop_s16lsb:\n" | ||
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: /* no return value */ | ||
: /* input */ | ||
"a"(dst), "a"(src), "d"(len), "d"(volume) | ||
: /* clobbered registers */ | ||
"d0", "d1", "d2", "d3", "cc", "memory" | ||
); | ||
} | ||
#endif | ||
|
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -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); | ||
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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 |