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annotate src/audio/SDL_mixer_m68k.c @ 644:594422ab8f9f

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Atari MiNT: added more audio drivers
author Patrice Mandin <patmandin@gmail.com>
date Mon, 07 Jul 2003 19:16:03 +0000
parents 873c2598f969
children b8d311d90021
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, 1998, 1999, 2000, 2001, 2002 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
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23 /*
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24 m68k assembly mix routines
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25
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26 Patrice Mandin
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27 */
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28
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29 #if defined(__M68000__) && defined(__GNUC__)
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30 void SDL_MixAudio_m68k_U8(char* dst, char* src, long len, long volume, char* mix8)
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31 {
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32 __asm__ __volatile__ (
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33
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34 "tstl %2\n"
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35 " beqs stoploop_u8\n"
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36 "mixloop_u8:\n"
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37
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38 /* Mix a sample */
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39
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40 " moveq #0,%%d0\n"
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41 " moveq #0,%%d1\n"
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42
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43 " moveb %1@+,%%d0\n" /* d0 = *src++ */
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44 " sub #128,%%d0\n" /* d0 -= 128 */
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45 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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46 " moveb %0@,%%d1\n" /* d1 = *dst */
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47 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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48 " add #128,%%d0\n" /* d0 += 128 */
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49
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50 " add %%d1,%%d0\n"
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51
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52 " moveb %4@(%%d0:w),%0@+\n"
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53
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54 /* Loop till done */
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55
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56 " subql #1,%2\n"
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57 " bhis mixloop_u8\n"
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58 "stoploop_u8:\n"
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59
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60 : /* no return value */
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61 : /* input */
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62 "a"(dst), "a"(src), "d"(len), "d"(volume), "a"(mix8)
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63 : /* clobbered registers */
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64 "d0", "d1", "cc", "memory"
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65 );
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66 }
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67
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68 void SDL_MixAudio_m68k_S8(char* dst, char* src, long len, long volume)
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69 {
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70 __asm__ __volatile__ (
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71
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72 "tstl %2\n"
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73 " beqs stoploop_s8\n"
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74 " moveq #-128,%%d2\n"
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75 " moveq #127,%%d3\n"
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76 "mixloop_s8:\n"
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77
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78 /* Mix a sample */
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79
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80 " moveq #0,%%d0\n"
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81 " moveq #0,%%d1\n"
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82
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83 " moveb %1@+,%%d0\n" /* d0 = *src++ */
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84 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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85 " moveb %0@,%%d1\n" /* d1 = *dst */
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86 " asr #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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87
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88 " add %%d1,%%d0\n"
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89
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90 " cmp %%d2,%%d0\n"
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91 " bges lower_limit_s8\n"
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92 " move %%d2,%%d0\n"
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93 "lower_limit_s8:\n"
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94
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95 " cmp %%d3,%%d0\n"
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96 " bles upper_limit_s8\n"
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97 " move %%d3,%%d0\n"
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98 "upper_limit_s8:\n"
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99 " moveb %%d0,%0@+\n"
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100
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101 /* Loop till done */
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102
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103 " subql #1,%2\n"
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104 " bhis mixloop_s8\n"
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105 "stoploop_s8:\n"
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106
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107 : /* no return value */
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108 : /* input */
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109 "a"(dst), "a"(src), "d"(len), "d"(volume)
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110 : /* clobbered registers */
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111 "d0", "d1", "d2", "d3", "cc", "memory"
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112 );
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113 }
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114
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115 void SDL_MixAudio_m68k_S16MSB(short* dst, short* src, long len, long volume)
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116 {
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117 __asm__ __volatile__ (
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118
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119 "tstl %2\n"
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120 " beqs stoploop_s16msb\n"
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121 " movel #-32768,%%d2\n"
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122 " movel #32767,%%d3\n"
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123 " lsrl #1,%2\n"
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124 "mixloop_s16msb:\n"
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125
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126 /* Mix a sample */
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127
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128 " move %1@+,%%d0\n" /* d0 = *src++ */
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129 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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130 " move %0@,%%d1\n" /* d1 = *dst */
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131 " extl %%d1\n" /* extend d1 to 32 bits */
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132 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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133
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134 " addl %%d1,%%d0\n"
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135
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136 " cmpl %%d2,%%d0\n"
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137 " bges lower_limit_s16msb\n"
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138 " move %%d2,%%d0\n"
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139 "lower_limit_s16msb:\n"
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140
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141 " cmpl %%d3,%%d0\n"
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142 " bles upper_limit_s16msb\n"
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143 " move %%d3,%%d0\n"
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144 "upper_limit_s16msb:\n"
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145 " move %%d0,%0@+\n"
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146
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147 /* Loop till done */
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148
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149 " subql #1,%2\n"
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150 " bhis mixloop_s16msb\n"
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151 "stoploop_s16msb:\n"
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152
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153 : /* no return value */
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154 : /* input */
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155 "a"(dst), "a"(src), "d"(len), "d"(volume)
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156 : /* clobbered registers */
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157 "d0", "d1", "d2", "d3", "cc", "memory"
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158 );
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159 }
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160
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161 void SDL_MixAudio_m68k_S16LSB(short* dst, short* src, long len, long volume)
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162 {
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163 __asm__ __volatile__ (
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164
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165 "tstl %2\n"
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166 " beqs stoploop_s16lsb\n"
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167 " movel #-32768,%%d2\n"
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168 " movel #32767,%%d3\n"
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169 " lsrl #1,%2\n"
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170 "mixloop_s16lsb:\n"
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171
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172 /* Mix a sample */
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173
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174 " move %1@+,%%d0\n" /* d0 = *src++ */
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175 " rorw #8,%%d0\n"
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176 " muls %3,%%d0\n" /* d0 *= volume (0<=volume<=128) */
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177 " move %0@,%%d1\n" /* d1 = *dst */
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178 " rorw #8,%%d1\n"
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179 " extl %%d1\n" /* extend d1 to 32 bits */
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180 " asrl #7,%%d0\n" /* d0 /= 128 (SDL_MIX_MAXVOLUME) */
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181
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182 " addl %%d1,%%d0\n"
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183
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184 " cmpl %%d2,%%d0\n"
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185 " bges lower_limit_s16lsb\n"
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186 " move %%d2,%%d0\n"
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187 "lower_limit_s16lsb:\n"
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188
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189 " cmpl %%d3,%%d0\n"
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190 " bles upper_limit_s16lsb\n"
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191 " move %%d3,%%d0\n"
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192 "upper_limit_s16lsb:\n"
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193 " rorw #8,%%d0\n"
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194 " move %%d0,%0@+\n"
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195
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196 /* Loop till done */
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197
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198 " subql #1,%2\n"
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199 " bhis mixloop_s16lsb\n"
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200 "stoploop_s16lsb:\n"
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201
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202 : /* no return value */
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203 : /* input */
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204 "a"(dst), "a"(src), "d"(len), "d"(volume)
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205 : /* clobbered registers */
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206 "d0", "d1", "d2", "d3", "cc", "memory"
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207 );
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208 }
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209 #endif
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210