Mercurial > sdl-ios-xcode
annotate src/audio/SDL_mixer_m68k.c @ 1551:02e19471a694
Fixed bug #4
[Note: I'm applying this patch since it's a cleaner version of what's already implemented, and supports this controller on older kernels. I'll ask to make sure this doesn't break on the new kernels where it's no longer necessary]
Date: Mon, 21 Mar 2005 09:41:11 -0500
From: Chris Nelson
Subject: SDL Patch
Hey, Ryan.
I submitted the following patch about a year ago. It's just a simple
patch for the linux port, to make multiple joysticks each appear to SDL
as their own device, if they are on the same USB port (specifically,
these guys
<http://www.consoleplus.co.uk/product_info.php?pName=super-joybox-5-quad-joypad-converter>,
which allow 4 Playstation2 controllers to be accessed via a single USB
port). Without this patch, SDL pretty much drops the ball, and reports
that there are 4 joysticks available when less than that number are
plugged in.
My work built upon the work of another person with the same device. When
I submitted the patch to the list, he tested it, but it didn't work for
him, so the patch was never accepted. Maybe about 3 times in the past
year, I've tried to email the guy, to see if he couldn't run my new
version, complete with debug code to diagnose the problem he was having.
He never got back to me.
So, I'm attaching the patch. I wish I knew why it didn't work for him,
but I've been using it for the last year with no problems. Let me know
if you need any more information, or have any ideas as to how I could
test it. I'd like to see it in the tree, but I want to make sure it works.
-Chris
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sun, 19 Mar 2006 06:31:34 +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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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 #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 |