sdl-ios-xcode: src/audio/SDL_mixer

annotate src/audio/SDL_mixer_m68k.c @ 4168:69bcba65c388 SDL-1.2

Fixed bug #526 Comment #1 From Simon Howard 2009-03-20 16:50:56 Hi, I'm the author of Chocolate Doom, one of the other source ports that James mentioned. This is a patch against the current SVN version of SDL 1.2 that fixes the bug. It has been tested and hopefully should be obviously correct from examining the changes. I'll give a brief explanation. When the palette is set with SDL_SetPalette, the IDirectDrawPalette_SetEntries DirectX function is invoked. However, when this happens, a WM_PALETTECHANGED message is sent to the window. A WM_PALETTECHANGED message can also be received if the palette is changed for some other reason, like if the system palette is changed. Therefore, the palette change handler (DX5_PaletteChanged) has code to deal with this case. It distinguishes "expected" palette changes (set with SDL_SetPalette) from "unexpected" palette changes using the colorchange_expected variable, which is set before calling IDirectDrawPalette_SetEntries. However, the code to set this variable is missing in the fullscreen code path. By setting this variable, the palette change is handled properly and the freezes go away.

author	Sam Lantinga <slouken@libsdl.org>
date	Mon, 13 Apr 2009 00:53:12 +0000
parents	a1b03ba2fcd0
children	124629b76853

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
4159 a1b03ba2fcd0 Updated copyright date Sam Lantinga <slouken@libsdl.org> parents: 1402 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__)
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	31 void SDL_MixAudio_m68k_U8(char* dst, char* src, long len, long volume, char* mix8)
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	32 {
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	33 __asm__ __volatile__ (
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	34
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	35 "tstl %2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	36 " beqs stoploop_u8\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	37 "mixloop_u8:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	38
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	39 /* Mix a sample */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	40
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	41 " moveq #0,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	42 " moveq #0,%%d1\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	43
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	44 " moveb %1@+,%%d0\n" /* d0 = src++ /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	45 " sub #128,%%d0\n" /* d0 -= 128 */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	46 " muls %3,%%d0\n" /* d0 = volume (0<=volume<=128) /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	47 " moveb %0@,%%d1\n" /* d1 = dst /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	48 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	49 " add #128,%%d0\n" /* d0 += 128 */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	50
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	51 " add %%d1,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	52
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	53 " moveb %4@(%%d0:w),%0@+\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	54
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	55 /* Loop till done */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	56
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	57 " subql #1,%2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	58 " bhis mixloop_u8\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	59 "stoploop_u8:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	60
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	61 : /* no return value */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	62 : /* input */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	63 "a"(dst), "a"(src), "d"(len), "d"(volume), "a"(mix8)
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	64 : /* clobbered registers */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	65 "d0", "d1", "cc", "memory"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	66 );
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	67 }
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	68
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	69 void SDL_MixAudio_m68k_S8(char* dst, char* src, long len, long volume)
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	70 {
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	71 __asm__ __volatile__ (
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	72
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	73 "tstl %2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	74 " beqs stoploop_s8\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	75 " moveq #-128,%%d2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	76 " moveq #127,%%d3\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	77 "mixloop_s8:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	78
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	79 /* Mix a sample */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	80
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	81 " moveq #0,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	82 " moveq #0,%%d1\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	83
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	84 " moveb %1@+,%%d0\n" /* d0 = src++ /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	85 " muls %3,%%d0\n" /* d0 = volume (0<=volume<=128) /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	86 " moveb %0@,%%d1\n" /* d1 = dst /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	87 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	88
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	89 " add %%d1,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	90
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	91 " cmp %%d2,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	92 " bges lower_limit_s8\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	93 " move %%d2,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	94 "lower_limit_s8:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	95
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	96 " cmp %%d3,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	97 " bles upper_limit_s8\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	98 " move %%d3,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	99 "upper_limit_s8:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	100 " moveb %%d0,%0@+\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	101
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	102 /* Loop till done */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	103
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	104 " subql #1,%2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	105 " bhis mixloop_s8\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	106 "stoploop_s8:\n"
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 : /* no return value */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	109 : /* input */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	110 "a"(dst), "a"(src), "d"(len), "d"(volume)
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	111 : /* clobbered registers */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	112 "d0", "d1", "d2", "d3", "cc", "memory"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	113 );
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	114 }
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	115
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	116 void SDL_MixAudio_m68k_S16MSB(short* dst, short* src, long len, long volume)
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	117 {
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	118 __asm__ __volatile__ (
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	119
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	120 "tstl %2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	121 " beqs stoploop_s16msb\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	122 " movel #-32768,%%d2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	123 " movel #32767,%%d3\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	124 " lsrl #1,%2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	125 "mixloop_s16msb:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	126
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	127 /* Mix a sample */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	128
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	129 " move %1@+,%%d0\n" /* d0 = src++ /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	130 " muls %3,%%d0\n" /* d0 = volume (0<=volume<=128) /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	131 " move %0@,%%d1\n" /* d1 = dst /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	132 " extl %%d1\n" /* extend d1 to 32 bits */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	133 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	134
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	135 " addl %%d1,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	136
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	137 " cmpl %%d2,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	138 " bges lower_limit_s16msb\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	139 " move %%d2,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	140 "lower_limit_s16msb:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	141
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	142 " cmpl %%d3,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	143 " bles upper_limit_s16msb\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	144 " move %%d3,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	145 "upper_limit_s16msb:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	146 " move %%d0,%0@+\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	147
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	148 /* Loop till done */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	149
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	150 " subql #1,%2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	151 " bhis mixloop_s16msb\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	152 "stoploop_s16msb:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	153
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	154 : /* no return value */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	155 : /* input */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	156 "a"(dst), "a"(src), "d"(len), "d"(volume)
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	157 : /* clobbered registers */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	158 "d0", "d1", "d2", "d3", "cc", "memory"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	159 );
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	160 }
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	161
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	162 void SDL_MixAudio_m68k_S16LSB(short* dst, short* src, long len, long volume)
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	163 {
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	164 __asm__ __volatile__ (
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	165
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	166 "tstl %2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	167 " beqs stoploop_s16lsb\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	168 " movel #-32768,%%d2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	169 " movel #32767,%%d3\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	170 " lsrl #1,%2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	171 "mixloop_s16lsb:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	172
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	173 /* Mix a sample */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	174
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	175 " move %1@+,%%d0\n" /* d0 = src++ /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	176 " rorw #8,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	177 " muls %3,%%d0\n" /* d0 = volume (0<=volume<=128) /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	178 " move %0@,%%d1\n" /* d1 = dst /
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	179 " rorw #8,%%d1\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	180 " extl %%d1\n" /* extend d1 to 32 bits */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	181 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	182
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	183 " addl %%d1,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	184
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	185 " cmpl %%d2,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	186 " bges lower_limit_s16lsb\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	187 " move %%d2,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	188 "lower_limit_s16lsb:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	189
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	190 " cmpl %%d3,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	191 " bles upper_limit_s16lsb\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	192 " move %%d3,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	193 "upper_limit_s16lsb:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	194 " rorw #8,%%d0\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	195 " move %%d0,%0@+\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	196
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	197 /* Loop till done */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	198
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	199 " subql #1,%2\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	200 " bhis mixloop_s16lsb\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	201 "stoploop_s16lsb:\n"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	202
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	203 : /* no return value */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	204 : /* input */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	205 "a"(dst), "a"(src), "d"(len), "d"(volume)
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	206 : /* clobbered registers */
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	207 "d0", "d1", "d2", "d3", "cc", "memory"
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	208 );
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	209 }
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	210 #endif
873c2598f969 Add m68k assembly mixing routines Patrice Mandin <patmandin@gmail.com> parents: diff changeset	211

Mercurial > sdl-ios-xcode

annotate src/audio/SDL_mixer_m68k.c @ 4168:69bcba65c388 SDL-1.2