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annotate src/audio/SDL_mixer_m68k.c @ 866:0a45995a7fc3

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Date: Tue, 2 Mar 2004 11:34:54 +0100 From: Bartosz Fenski aka fEnIo Subject: outdated entry in INSTALL file I've just found in INSTALL file: If you are cross-compiling from Linux to Win32, you should read the file README.Win32 But you don't shipped this file with SDL. I've found in CVS logs that this file has been deleted and this information is now in FAQ.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 02 Mar 2004 13:01:02 +0000
parents b8d311d90021
children d910939febfa
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
633
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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