211 lines
4.6 KiB
C
211 lines
4.6 KiB
C
/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2012 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/*
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m68k assembly mix routines
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Patrice Mandin
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*/
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#if (defined(__m68k__) && !defined(__mcoldfire__)) && defined(__GNUC__)
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void SDL_MixAudio_m68k_U8(char* dst, char* src, long len, long volume, char* mix8)
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{
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__asm__ __volatile__ (
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"tstl %2\n"
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" beqs stoploop_u8\n"
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"mixloop_u8:\n"
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/* Mix a sample */
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" moveq #0,%%d0\n"
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" moveq #0,%%d1\n"
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" moveb %1@+,%%d0\n" /* d0 = *src++ */
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" sub #128,%%d0\n" /* d0 -= 128 */
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" muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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" moveb %0@,%%d1\n" /* d1 = *dst */
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" asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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" 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"
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" bhis mixloop_u8\n"
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"stoploop_u8:\n"
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: /* no return value */
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: /* input */
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"a"(dst), "a"(src), "d"(len), "d"(volume), "a"(mix8)
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: /* clobbered registers */
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"d0", "d1", "cc", "memory"
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);
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}
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void SDL_MixAudio_m68k_S8(char* dst, char* src, long len, long volume)
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{
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__asm__ __volatile__ (
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"tstl %2\n"
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" beqs stoploop_s8\n"
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" moveq #-128,%%d2\n"
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" moveq #127,%%d3\n"
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"mixloop_s8:\n"
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/* Mix a sample */
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" moveq #0,%%d0\n"
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" moveq #0,%%d1\n"
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" moveb %1@+,%%d0\n" /* d0 = *src++ */
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" muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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" moveb %0@,%%d1\n" /* d1 = *dst */
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" 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"
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" bges lower_limit_s8\n"
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" move %%d2,%%d0\n"
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"lower_limit_s8:\n"
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" cmp %%d3,%%d0\n"
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" bles upper_limit_s8\n"
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" move %%d3,%%d0\n"
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"upper_limit_s8:\n"
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" moveb %%d0,%0@+\n"
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/* Loop till done */
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" subql #1,%2\n"
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" bhis mixloop_s8\n"
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"stoploop_s8:\n"
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: /* no return value */
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: /* input */
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"a"(dst), "a"(src), "d"(len), "d"(volume)
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: /* clobbered registers */
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"d0", "d1", "d2", "d3", "cc", "memory"
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);
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}
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void SDL_MixAudio_m68k_S16MSB(short* dst, short* src, long len, long volume)
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{
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__asm__ __volatile__ (
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"tstl %2\n"
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" beqs stoploop_s16msb\n"
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" movel #-32768,%%d2\n"
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" movel #32767,%%d3\n"
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" lsrl #1,%2\n"
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"mixloop_s16msb:\n"
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/* Mix a sample */
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" move %1@+,%%d0\n" /* d0 = *src++ */
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" muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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" move %0@,%%d1\n" /* d1 = *dst */
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" extl %%d1\n" /* extend d1 to 32 bits */
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" 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"
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" bges lower_limit_s16msb\n"
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" move %%d2,%%d0\n"
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"lower_limit_s16msb:\n"
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" cmpl %%d3,%%d0\n"
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" bles upper_limit_s16msb\n"
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" move %%d3,%%d0\n"
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"upper_limit_s16msb:\n"
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" move %%d0,%0@+\n"
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/* Loop till done */
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" subql #1,%2\n"
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" bhis mixloop_s16msb\n"
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"stoploop_s16msb:\n"
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: /* no return value */
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: /* input */
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"a"(dst), "a"(src), "d"(len), "d"(volume)
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: /* clobbered registers */
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"d0", "d1", "d2", "d3", "cc", "memory"
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);
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}
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void SDL_MixAudio_m68k_S16LSB(short* dst, short* src, long len, long volume)
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{
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__asm__ __volatile__ (
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"tstl %2\n"
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" beqs stoploop_s16lsb\n"
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" movel #-32768,%%d2\n"
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" movel #32767,%%d3\n"
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" lsrl #1,%2\n"
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"mixloop_s16lsb:\n"
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/* Mix a sample */
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" move %1@+,%%d0\n" /* d0 = *src++ */
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" rorw #8,%%d0\n"
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" muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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" move %0@,%%d1\n" /* d1 = *dst */
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" rorw #8,%%d1\n"
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" extl %%d1\n" /* extend d1 to 32 bits */
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" 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"
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" bges lower_limit_s16lsb\n"
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" move %%d2,%%d0\n"
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"lower_limit_s16lsb:\n"
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" cmpl %%d3,%%d0\n"
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" bles upper_limit_s16lsb\n"
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" move %%d3,%%d0\n"
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"upper_limit_s16lsb:\n"
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" rorw #8,%%d0\n"
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" move %%d0,%0@+\n"
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/* Loop till done */
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" subql #1,%2\n"
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" bhis mixloop_s16lsb\n"
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"stoploop_s16lsb:\n"
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: /* no return value */
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: /* input */
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"a"(dst), "a"(src), "d"(len), "d"(volume)
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: /* clobbered registers */
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"d0", "d1", "d2", "d3", "cc", "memory"
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);
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}
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#endif
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