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annotate src/audio/SDL_mixer_m68k.c @ 3235:d35b649858e0

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David Carre to Sam Hello sam, me again. I'v fixed another bug in the pandora code, it's on the no-X videodriver, i forgot to add some code to destroy the window so it was impossible to reload SDL inside the same application (eglTerminate). You'll find the svn diff attached. See you, David.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 11 Aug 2009 13:45:01 +0000
parents 99210400e8b9
children efb79807afe1
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /*
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25 m68k assembly mix routines
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26
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27 Patrice Mandin
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28 */
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29
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30 #if defined(__M68000__) && defined(__GNUC__)
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31 void
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32 SDL_MixAudio_m68k_U8(char *dst, char *src, long len, long volume, char *mix8)
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33 {
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34 __asm__ __volatile__("tstl %2\n" " beqs stoploop_u8\n" "mixloop_u8:\n"
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35 /* Mix a sample */
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36 " moveq #0,%%d0\n" " moveq #0,%%d1\n" " moveb %1@+,%%d0\n" /* d0 = *src++ */
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37 " sub #128,%%d0\n" /* d0 -= 128 */
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38 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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39 " moveb %0@,%%d1\n" /* d1 = *dst */
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40 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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41 " add #128,%%d0\n" /* d0 += 128 */
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42 " add %%d1,%%d0\n"
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43 " moveb %4@(%%d0:w),%0@+\n"
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44 /* Loop till done */
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45 " subql #1,%2\n" " bhis mixloop_u8\n" "stoploop_u8:\n": /* no return value */
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46 : /* input */
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47 "a"(dst), "a"(src), "d"(len), "d"(volume), "a"(mix8): /* clobbered registers */
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48 "d0", "d1", "cc", "memory");
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49 }
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50
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51 void
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52 SDL_MixAudio_m68k_S8(char *dst, char *src, long len, long volume)
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53 {
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54 __asm__ __volatile__("tstl %2\n"
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55 " beqs stoploop_s8\n"
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56 " moveq #-128,%%d2\n"
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57 " moveq #127,%%d3\n" "mixloop_s8:\n"
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58 /* Mix a sample */
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59 " moveq #0,%%d0\n" " moveq #0,%%d1\n" " moveb %1@+,%%d0\n" /* d0 = *src++ */
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60 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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61 " moveb %0@,%%d1\n" /* d1 = *dst */
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62 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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63 " add %%d1,%%d0\n"
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64 " cmp %%d2,%%d0\n"
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65 " bges lower_limit_s8\n"
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66 " move %%d2,%%d0\n"
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67 "lower_limit_s8:\n"
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68 " cmp %%d3,%%d0\n"
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69 " bles upper_limit_s8\n"
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70 " move %%d3,%%d0\n"
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71 "upper_limit_s8:\n" " moveb %%d0,%0@+\n"
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72 /* Loop till done */
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73 " subql #1,%2\n" " bhis mixloop_s8\n" "stoploop_s8:\n": /* no return value */
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74 : /* input */
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75 "a"(dst), "a"(src), "d"(len), "d"(volume): /* clobbered registers */
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76 "d0", "d1", "d2", "d3", "cc", "memory");
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77 }
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78
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79 void
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80 SDL_MixAudio_m68k_S16MSB(short *dst, short *src, long len, long volume)
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81 {
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82 __asm__ __volatile__("tstl %2\n"
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83 " beqs stoploop_s16msb\n"
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84 " movel #-32768,%%d2\n"
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85 " movel #32767,%%d3\n"
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86 " lsrl #1,%2\n" "mixloop_s16msb:\n"
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87 /* Mix a sample */
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88 " move %1@+,%%d0\n" /* d0 = *src++ */
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89 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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90 " move %0@,%%d1\n" /* d1 = *dst */
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91 " extl %%d1\n" /* extend d1 to 32 bits */
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92 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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93 " addl %%d1,%%d0\n"
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94 " cmpl %%d2,%%d0\n"
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95 " bges lower_limit_s16msb\n"
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96 " move %%d2,%%d0\n"
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97 "lower_limit_s16msb:\n"
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98 " cmpl %%d3,%%d0\n"
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99 " bles upper_limit_s16msb\n"
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100 " move %%d3,%%d0\n"
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101 "upper_limit_s16msb:\n" " move %%d0,%0@+\n"
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102 /* Loop till done */
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103 " subql #1,%2\n" " bhis mixloop_s16msb\n" "stoploop_s16msb:\n": /* no return value */
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104 : /* input */
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105 "a"(dst), "a"(src), "d"(len), "d"(volume): /* clobbered registers */
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106 "d0", "d1", "d2", "d3", "cc", "memory");
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107 }
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108
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109 void
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110 SDL_MixAudio_m68k_S16LSB(short *dst, short *src, long len, long volume)
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111 {
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112 __asm__ __volatile__("tstl %2\n"
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113 " beqs stoploop_s16lsb\n"
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114 " movel #-32768,%%d2\n"
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115 " movel #32767,%%d3\n"
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116 " lsrl #1,%2\n" "mixloop_s16lsb:\n"
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117 /* Mix a sample */
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118 " move %1@+,%%d0\n" /* d0 = *src++ */
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119 " rorw #8,%%d0\n" " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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120 " move %0@,%%d1\n" /* d1 = *dst */
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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.
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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.
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123 " addl %%d1,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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>
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125 " bges lower_limit_s16lsb\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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126 " move %%d2,%%d0\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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127 "lower_limit_s16lsb:\n"
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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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>
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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>
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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
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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
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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>
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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>
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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>
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135 : /* input */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
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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>
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137 "d0", "d1", "d2", "d3", "cc", "memory");
633
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
parents:
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138 }
873c2598f969 Add m68k assembly mixing routines
Patrice Mandin <patmandin@gmail.com>
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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>
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140 /* vi: set ts=4 sw=4 expandtab: */