Mercurial > sdl-ios-xcode

annotate src/audio/SDL_mixer_m68k.c @ 3442:204609180482

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Compare against the correct image
author Sam Lantinga <slouken@libsdl.org>
date Wed, 18 Nov 2009 06:15:21 +0000
parents 99210400e8b9
children efb79807afe1
rev   line source
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
1 /*
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
2 SDL - Simple DirectMedia Layer
2859
99210400e8b9 Updated copyright date
Sam Lantinga <slouken@libsdl.org>
parents: 1895
diff changeset
3 Copyright (C) 1997-2009 Sam Lantinga
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
4
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
5 This library is free software; you can redistribute it and/or
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
6 modify it under the terms of the GNU Library General Public
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
7 License as published by the Free Software Foundation; either
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
8 version 2 of the License, or (at your option) any later version.
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
9
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
10 This library is distributed in the hope that it will be useful,
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
13 Library General Public License for more details.
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
14
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
15 You should have received a copy of the GNU Library General Public
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
16 License along with this library; if not, write to the Free
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
18
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
19 Sam Lantinga
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
20 slouken@libsdl.org
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
21 */
1402
d910939febfa Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
22 #include "SDL_config.h"
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
23
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
24 /*
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
25 m68k assembly mix routines
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
26
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
27 Patrice Mandin
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
28 */
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
29
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
30 #if defined(__M68000__) && defined(__GNUC__)
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
31 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
32 SDL_MixAudio_m68k_U8(char *dst, char *src, long len, long volume, char *mix8)
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
33 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
34 __asm__ __volatile__("tstl %2\n" " beqs stoploop_u8\n" "mixloop_u8:\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
35 /* Mix a sample */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
36 " moveq #0,%%d0\n" " moveq #0,%%d1\n" " moveb %1@+,%%d0\n" /* d0 = *src++ */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
37 " sub #128,%%d0\n" /* d0 -= 128 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
38 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
39 " moveb %0@,%%d1\n" /* d1 = *dst */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
40 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
41 " add #128,%%d0\n" /* d0 += 128 */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
42 " add %%d1,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
43 " moveb %4@(%%d0:w),%0@+\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
44 /* Loop till done */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
45 " subql #1,%2\n" " bhis mixloop_u8\n" "stoploop_u8:\n": /* no return value */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
46 : /* input */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
47 "a"(dst), "a"(src), "d"(len), "d"(volume), "a"(mix8): /* clobbered registers */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
48 "d0", "d1", "cc", "memory");
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
49 }
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
50
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
51 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
52 SDL_MixAudio_m68k_S8(char *dst, char *src, long len, long volume)
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
53 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
54 __asm__ __volatile__("tstl %2\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
55 " beqs stoploop_s8\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
56 " moveq #-128,%%d2\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
57 " moveq #127,%%d3\n" "mixloop_s8:\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
58 /* Mix a sample */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
59 " moveq #0,%%d0\n" " moveq #0,%%d1\n" " moveb %1@+,%%d0\n" /* d0 = *src++ */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
60 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
61 " moveb %0@,%%d1\n" /* d1 = *dst */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
62 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
63 " add %%d1,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
64 " cmp %%d2,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
65 " bges lower_limit_s8\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
66 " move %%d2,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
67 "lower_limit_s8:\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
68 " cmp %%d3,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
69 " bles upper_limit_s8\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
70 " move %%d3,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
71 "upper_limit_s8:\n" " moveb %%d0,%0@+\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
72 /* Loop till done */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
73 " subql #1,%2\n" " bhis mixloop_s8\n" "stoploop_s8:\n": /* no return value */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
74 : /* input */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
75 "a"(dst), "a"(src), "d"(len), "d"(volume): /* clobbered registers */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
76 "d0", "d1", "d2", "d3", "cc", "memory");
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
77 }
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
78
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
79 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
80 SDL_MixAudio_m68k_S16MSB(short *dst, short *src, long len, long volume)
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
81 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
82 __asm__ __volatile__("tstl %2\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
83 " beqs stoploop_s16msb\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
84 " movel #-32768,%%d2\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
85 " movel #32767,%%d3\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
86 " lsrl #1,%2\n" "mixloop_s16msb:\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
87 /* Mix a sample */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
88 " move %1@+,%%d0\n" /* d0 = *src++ */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
89 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
90 " move %0@,%%d1\n" /* d1 = *dst */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
91 " extl %%d1\n" /* extend d1 to 32 bits */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
92 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
93 " addl %%d1,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
94 " cmpl %%d2,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
95 " bges lower_limit_s16msb\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
96 " move %%d2,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
97 "lower_limit_s16msb:\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
98 " cmpl %%d3,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
99 " bles upper_limit_s16msb\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
100 " move %%d3,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
101 "upper_limit_s16msb:\n" " move %%d0,%0@+\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
102 /* Loop till done */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
103 " subql #1,%2\n" " bhis mixloop_s16msb\n" "stoploop_s16msb:\n": /* no return value */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
104 : /* input */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
105 "a"(dst), "a"(src), "d"(len), "d"(volume): /* clobbered registers */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
106 "d0", "d1", "d2", "d3", "cc", "memory");
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
107 }
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
108
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
109 void
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
110 SDL_MixAudio_m68k_S16LSB(short *dst, short *src, long len, long volume)
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
111 {
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
112 __asm__ __volatile__("tstl %2\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
113 " beqs stoploop_s16lsb\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
114 " movel #-32768,%%d2\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
115 " movel #32767,%%d3\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
116 " lsrl #1,%2\n" "mixloop_s16lsb:\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
117 /* Mix a sample */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
118 " move %1@+,%%d0\n" /* d0 = *src++ */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
119 " rorw #8,%%d0\n" " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
120 " move %0@,%%d1\n" /* d1 = *dst */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
121 " rorw #8,%%d1\n" " extl %%d1\n" /* extend d1 to 32 bits */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
122 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
123 " addl %%d1,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
124 " cmpl %%d2,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
125 " bges lower_limit_s16lsb\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
126 " move %%d2,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
127 "lower_limit_s16lsb:\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
128 " cmpl %%d3,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
129 " bles upper_limit_s16lsb\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
130 " move %%d3,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
131 "upper_limit_s16lsb:\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
132 " rorw #8,%%d0\n" " move %%d0,%0@+\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
133 /* Loop till done */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
134 " subql #1,%2\n" " bhis mixloop_s16lsb\n" "stoploop_s16lsb:\n": /* no return value */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
135 : /* input */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
136 "a"(dst), "a"(src), "d"(len), "d"(volume): /* clobbered registers */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
137 "d0", "d1", "d2", "d3", "cc", "memory");
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
138 }
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
diff changeset
139 #endif
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
140 /* vi: set ts=4 sw=4 expandtab: */