Mercurial > sdl-ios-xcode

annotate src/audio/SDL_mixer_m68k.c @ 3096:ae4e80dbe330

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Date: Tue, 17 Feb 2009 14:00:25 +0100 From: Stefan Klug Subject: [SDL] Possible bug, paused audio playing garbage On my WinCE device a paused audio device plays random garbage. This might also be the issue in the thread "sound cracks with SDL_mixer and AUDIO_S16LSB" I don't have that much knowledge of the SDL audio part, but the attached patch fixes it for me, and collapses two redundant ifs. I'm not sure if this is the correct way to fix this. Shouldn't the complete stream conversion part of the RunAudio loop be dependent on the paused property of the device? (not only the call to (*fill)(udata, istream, istream_len). Anyways. Would be great if the patch or a fix could find its way to SVN ;-) Cheers Stefan
author Sam Lantinga <slouken@libsdl.org>
date Mon, 23 Mar 2009 05:21:40 +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: */