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annotate src/audio/SDL_mixer_m68k.c @ 1604:bfba1ea4452a

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author Sam Lantinga <slouken@libsdl.org>
date Thu, 23 Mar 2006 21:39:02 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 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 SDL_MixAudio_m68k_U8(char* dst, char* src, long len, long volume, char* mix8)
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32 {
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33 __asm__ __volatile__ (
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34
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35 "tstl %2\n"
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36 " beqs stoploop_u8\n"
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37 "mixloop_u8:\n"
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38
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39 /* Mix a sample */
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40
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41 " moveq #0,%%d0\n"
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42 " moveq #0,%%d1\n"
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43
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44 " moveb %1@+,%%d0\n" /* d0 = *src++ */
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45 " sub #128,%%d0\n" /* d0 -= 128 */
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46 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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47 " moveb %0@,%%d1\n" /* d1 = *dst */
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48 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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49 " add #128,%%d0\n" /* d0 += 128 */
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50
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51 " add %%d1,%%d0\n"
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52
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53 " moveb %4@(%%d0:w),%0@+\n"
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54
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55 /* Loop till done */
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56
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57 " subql #1,%2\n"
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58 " bhis mixloop_u8\n"
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59 "stoploop_u8:\n"
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60
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61 : /* no return value */
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62 : /* input */
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63 "a"(dst), "a"(src), "d"(len), "d"(volume), "a"(mix8)
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64 : /* clobbered registers */
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65 "d0", "d1", "cc", "memory"
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66 );
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67 }
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68
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69 void SDL_MixAudio_m68k_S8(char* dst, char* src, long len, long volume)
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70 {
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71 __asm__ __volatile__ (
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72
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73 "tstl %2\n"
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74 " beqs stoploop_s8\n"
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75 " moveq #-128,%%d2\n"
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76 " moveq #127,%%d3\n"
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77 "mixloop_s8:\n"
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78
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79 /* Mix a sample */
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80
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81 " moveq #0,%%d0\n"
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82 " moveq #0,%%d1\n"
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83
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84 " moveb %1@+,%%d0\n" /* d0 = *src++ */
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85 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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86 " moveb %0@,%%d1\n" /* d1 = *dst */
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87 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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88
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89 " add %%d1,%%d0\n"
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90
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91 " cmp %%d2,%%d0\n"
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92 " bges lower_limit_s8\n"
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93 " move %%d2,%%d0\n"
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94 "lower_limit_s8:\n"
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95
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96 " cmp %%d3,%%d0\n"
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97 " bles upper_limit_s8\n"
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98 " move %%d3,%%d0\n"
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99 "upper_limit_s8:\n"
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100 " moveb %%d0,%0@+\n"
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101
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102 /* Loop till done */
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103
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104 " subql #1,%2\n"
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105 " bhis mixloop_s8\n"
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106 "stoploop_s8:\n"
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107
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108 : /* no return value */
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109 : /* input */
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110 "a"(dst), "a"(src), "d"(len), "d"(volume)
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111 : /* clobbered registers */
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112 "d0", "d1", "d2", "d3", "cc", "memory"
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113 );
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114 }
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115
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116 void SDL_MixAudio_m68k_S16MSB(short* dst, short* src, long len, long volume)
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117 {
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118 __asm__ __volatile__ (
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119
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120 "tstl %2\n"
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121 " beqs stoploop_s16msb\n"
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122 " movel #-32768,%%d2\n"
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123 " movel #32767,%%d3\n"
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124 " lsrl #1,%2\n"
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125 "mixloop_s16msb:\n"
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126
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127 /* Mix a sample */
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128
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129 " move %1@+,%%d0\n" /* d0 = *src++ */
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130 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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131 " move %0@,%%d1\n" /* d1 = *dst */
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132 " extl %%d1\n" /* extend d1 to 32 bits */
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133 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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134
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135 " addl %%d1,%%d0\n"
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136
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137 " cmpl %%d2,%%d0\n"
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138 " bges lower_limit_s16msb\n"
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139 " move %%d2,%%d0\n"
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140 "lower_limit_s16msb:\n"
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141
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142 " cmpl %%d3,%%d0\n"
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143 " bles upper_limit_s16msb\n"
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144 " move %%d3,%%d0\n"
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145 "upper_limit_s16msb:\n"
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146 " move %%d0,%0@+\n"
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147
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148 /* Loop till done */
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149
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150 " subql #1,%2\n"
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151 " bhis mixloop_s16msb\n"
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152 "stoploop_s16msb:\n"
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153
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154 : /* no return value */
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155 : /* input */
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156 "a"(dst), "a"(src), "d"(len), "d"(volume)
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157 : /* clobbered registers */
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158 "d0", "d1", "d2", "d3", "cc", "memory"
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159 );
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160 }
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161
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162 void SDL_MixAudio_m68k_S16LSB(short* dst, short* src, long len, long volume)
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163 {
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164 __asm__ __volatile__ (
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165
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166 "tstl %2\n"
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167 " beqs stoploop_s16lsb\n"
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168 " movel #-32768,%%d2\n"
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169 " movel #32767,%%d3\n"
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170 " lsrl #1,%2\n"
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171 "mixloop_s16lsb:\n"
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172
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173 /* Mix a sample */
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174
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175 " move %1@+,%%d0\n" /* d0 = *src++ */
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176 " rorw #8,%%d0\n"
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177 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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178 " move %0@,%%d1\n" /* d1 = *dst */
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179 " rorw #8,%%d1\n"
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180 " extl %%d1\n" /* extend d1 to 32 bits */
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181 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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182
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183 " addl %%d1,%%d0\n"
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184
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185 " cmpl %%d2,%%d0\n"
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186 " bges lower_limit_s16lsb\n"
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187 " move %%d2,%%d0\n"
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188 "lower_limit_s16lsb:\n"
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189
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190 " cmpl %%d3,%%d0\n"
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191 " bles upper_limit_s16lsb\n"
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192 " move %%d3,%%d0\n"
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193 "upper_limit_s16lsb:\n"
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194 " rorw #8,%%d0\n"
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195 " move %%d0,%0@+\n"
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196
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197 /* Loop till done */
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198
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199 " subql #1,%2\n"
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200 " bhis mixloop_s16lsb\n"
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201 "stoploop_s16lsb:\n"
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202
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203 : /* no return value */
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204 : /* input */
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205 "a"(dst), "a"(src), "d"(len), "d"(volume)
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206 : /* clobbered registers */
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207 "d0", "d1", "d2", "d3", "cc", "memory"
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208 );
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209 }
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210 #endif
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211