Mercurial > sdl-ios-xcode
annotate src/audio/mint/SDL_mintaudio_it.S @ 1585:980d2a0dc2a3
Date: Tue, 4 Mar 2003 15:05:31 -0800
From: "Jim"
Subject: [SDL] Frame Buffer patches...
Okay I'm new at patch generation - so please tell me if there's a better way
I could have done this.
Attached are two patch files generated with 'cvs diff -u'
SDL-fb-open-lock.patch applies to SDL_fbvideo.c
Modifies the open loop to check /dev/fb/0 found on devfs...
Modifies the lock code to return failure if the current virtual terminal
is not the one opened for frame buffer writing...
Lock would hang forever if switched away (ctrl-alt-F1) ...
SDL-fb-mousedrv-screensave.patch applies to SDL_fbevents.c
Switches default mouse mode based on SDL_MOUSEDRV - currently only
accepts PS2 - otherwise default is MS Mouse.
When the screen is switched - exisiting code (wrapped in ifdef
SAVE_SCREEN_COTENTS) would save the wrong bit of the screen....
( I run frame buffer 1600x1200, the size I requested was 800x600 - the
save would save the top 800 lines (non biased) and restore them... Adding
screen->offset fixed that )
However, if that option is not set, then a call to SDL_UpdateRect (full
screen) is made. (which may have had it's contents changed since the screen
is not entirely locked because of lock-failure patch)
Jim
[patches slightly tweaked for SDL 1.2.10]
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 22 Mar 2006 07:48:22 +0000 |
parents | c83fa1c650dd |
children | d48ead2d2ba5 ea2a327b92d7 |
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 Audio interrupts |
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25 |
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26 Patrice Mandin, Didier Méquignon |
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27 */ |
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28 |
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29 .text |
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30 |
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31 .globl _SDL_MintAudio_Callback |
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32 |
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33 .globl _SDL_MintAudio_XbiosInterrupt |
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34 .globl _SDL_MintAudio_XbiosInterruptMeasureClock |
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35 .globl _SDL_MintAudio_Dma8Interrupt |
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36 .globl _SDL_MintAudio_StfaInterrupt |
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37 |
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38 .globl _SDL_MintAudio_mutex |
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39 .globl _SDL_MintAudio_audiobuf |
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40 .globl _SDL_MintAudio_numbuf |
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41 .globl _SDL_MintAudio_audiosize |
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42 .globl _SDL_MintAudio_clocktics |
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43 |
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44 .globl _SDL_MintAudio_stfa |
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45 |
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46 /* |
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47 How it works: |
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48 - Audio is playing buffer #0 (resp. #1) |
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49 - We must calculate a sample in buffer #1 (resp. #0) |
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50 so we first call the callback to do it |
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51 - Then we swap the buffers |
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52 */ |
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53 |
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54 #define savptr 0x4a2 |
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55 #define savamt 0x46 |
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56 |
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57 /*--- Xbios interrupt vector to measure Falcon external clock ---*/ |
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58 |
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59 _SDL_MintAudio_XbiosInterruptMeasureClock: /* 1 mS */ |
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60 |
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61 btst #0,0xFFFF8901:w /* state DMA sound */ |
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62 beqs SDL_MintAudio_EndIntMeasure |
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63 addql #1,_SDL_MintAudio_clocktics |
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64 SDL_MintAudio_EndIntMeasure: |
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65 bclr #5,0xFFFFFA0F:w /* Clear service bit */ |
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66 rte |
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67 |
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68 /*--- Xbios interrupt vector ---*/ |
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69 |
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70 _SDL_MintAudio_XbiosInterrupt: |
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71 |
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72 /* Reenable interrupts, so other interrupts can work */ |
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73 movew #0x2300,sr |
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74 |
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75 /* Clear service bit, so other MFP interrupts can work */ |
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76 bclr #5,0xfffffa0f:w |
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77 |
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78 /* Check if we are not already running */ |
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79 tstw _SDL_MintAudio_mutex |
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80 bnes SDL_MintAudio_XbiosEnd |
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81 notw _SDL_MintAudio_mutex |
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82 |
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83 /* Swap buffers */ |
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85 |
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86 moveml d0-d7/a0-a6,sp@- |
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87 |
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88 /* Callback */ |
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89 jsr _SDL_MintAudio_Callback |
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91 /* Reserve space for registers */ |
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92 subl #savamt,savptr |
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93 |
704 | 94 /* Set new buffer */ |
95 | |
96 moveq #0,d0 | |
97 movel _SDL_MintAudio_audiosize,d1 | |
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98 |
704 | 99 movew _SDL_MintAudio_numbuf,d0 |
100 lsll #2,d0 | |
101 lea _SDL_MintAudio_audiobuf,a0 | |
102 movel a0@(d0:l),a1 | |
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103 |
704 | 104 lea a1@(d1:l),a2 |
105 | |
106 movel a2,sp@- | |
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107 movel a1,sp@- |
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108 clrw sp@- |
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109 movew #131,sp@- |
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110 trap #14 |
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111 lea sp@(12),sp |
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112 |
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113 /* Restore registers space */ |
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114 addl #savamt,savptr |
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115 |
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116 moveml sp@+,d0-d7/a0-a6 |
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117 |
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118 clrw _SDL_MintAudio_mutex |
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119 SDL_MintAudio_XbiosEnd: |
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120 rte |
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121 |
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122 /*--- DMA 8 bits interrupt vector ---*/ |
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123 |
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124 _SDL_MintAudio_Dma8Interrupt: |
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125 |
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126 /* Reenable interrupts, so other interrupts can work */ |
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127 movew #0x2300,sr |
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128 |
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129 /* Clear service bit, so other MFP interrupts can work */ |
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130 bclr #5,0xfffffa0f:w |
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131 |
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132 /* Check if we are not already running */ |
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133 tstw _SDL_MintAudio_mutex |
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134 bnes SDL_MintAudio_Dma8End |
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135 notw _SDL_MintAudio_mutex |
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136 |
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137 /* Swap buffers */ |
704 | 138 eorw #1,_SDL_MintAudio_numbuf |
139 | |
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140 moveml d0-d7/a0-a6,sp@- |
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141 |
704 | 142 /* Callback */ |
143 jsr _SDL_MintAudio_Callback | |
144 | |
145 /* Set new buffer */ | |
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146 |
704 | 147 moveq #0,d0 |
148 | |
149 movew _SDL_MintAudio_numbuf,d0 | |
150 lslw #2,d0 | |
151 lea _SDL_MintAudio_audiobuf,a0 | |
152 movel a0@(d0:w),d1 | |
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153 |
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154 /* Modify DMA addresses */ |
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155 lea 0xffff8900:w,a0 |
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156 |
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157 moveb d1,a0@(0x07) /* Start address */ |
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158 rorl #8,d1 |
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159 moveb d1,a0@(0x05) |
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160 rorl #8,d1 |
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161 moveb d1,a0@(0x03) |
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162 swap d1 |
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163 |
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164 addl _SDL_MintAudio_audiosize,d1 |
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165 |
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166 moveb d1,a0@(0x13) /* End address */ |
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167 rorl #8,d1 |
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168 moveb d1,a0@(0x11) |
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169 rorl #8,d1 |
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170 moveb d1,a0@(0x0f) |
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171 |
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172 moveml sp@+,d0-d7/a0-a6 |
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173 |
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174 clrw _SDL_MintAudio_mutex |
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175 SDL_MintAudio_Dma8End: |
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176 rte |
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177 |
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178 /*--- STFA interrupt vector ---*/ |
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179 |
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180 STFA_SOUND_START = 6 |
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181 STFA_SOUND_END = STFA_SOUND_START+8 |
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182 |
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183 _SDL_MintAudio_StfaInterrupt: |
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184 |
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185 /* Reenable interrupts, so other interrupts can work */ |
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186 movew #0x2300,sr |
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187 |
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188 /* Check if we are not already running */ |
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189 tstw _SDL_MintAudio_mutex |
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190 bnes SDL_MintAudio_StfaEnd |
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191 notw _SDL_MintAudio_mutex |
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192 |
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193 /* Swap buffers */ |
704 | 194 eorw #1,_SDL_MintAudio_numbuf |
195 | |
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196 moveml d0-d7/a0-a6,sp@- |
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197 |
704 | 198 /* Callback */ |
199 jsr _SDL_MintAudio_Callback | |
200 | |
201 /* Set new buffer */ | |
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202 |
704 | 203 moveq #0,d0 |
204 movel _SDL_MintAudio_stfa,a1 | |
205 | |
206 movew _SDL_MintAudio_numbuf,d0 | |
207 lslw #2,d0 | |
208 lea _SDL_MintAudio_audiobuf,a0 | |
209 movel a0@(d0:w),d1 | |
644
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210 |
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211 /* Modify STFA replay buffers */ |
704 | 212 movel d1,a1@(STFA_SOUND_START) |
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213 addl _SDL_MintAudio_audiosize,d1 |
704 | 214 movel d1,a1@(STFA_SOUND_END) |
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215 |
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216 moveml sp@+,d0-d7/a0-a6 |
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217 |
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218 clrw _SDL_MintAudio_mutex |
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219 SDL_MintAudio_StfaEnd: |
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220 rte |