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annotate src/audio/nds/sound9.c @ 4168:69bcba65c388 SDL-1.2

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Fixed bug #526 Comment #1 From Simon Howard 2009-03-20 16:50:56 Hi, I'm the author of Chocolate Doom, one of the other source ports that James mentioned. This is a patch against the current SVN version of SDL 1.2 that fixes the bug. It has been tested and hopefully should be obviously correct from examining the changes. I'll give a brief explanation. When the palette is set with SDL_SetPalette, the IDirectDrawPalette_SetEntries DirectX function is invoked. However, when this happens, a WM_PALETTECHANGED message is sent to the window. A WM_PALETTECHANGED message can also be received if the palette is changed for some other reason, like if the system palette is changed. Therefore, the palette change handler (DX5_PaletteChanged) has code to deal with this case. It distinguishes "expected" palette changes (set with SDL_SetPalette) from "unexpected" palette changes using the colorchange_expected variable, which is set before calling IDirectDrawPalette_SetEntries. However, the code to set this variable is missing in the fullscreen code path. By setting this variable, the palette change is handled properly and the freezes go away.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 13 Apr 2009 00:53:12 +0000
parents a1b03ba2fcd0
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rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 #include "SDL_stdinc.h"
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24
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25 #include "soundcommon.h"
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26
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27 void SoundSystemInit(u32 rate,u32 buffersize,u8 channel,u8 format)
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28 {
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29 soundsystem->rate = rate;
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30
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31 if(format == 8)
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32 soundsystem->buffersize = buffersize;
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33 else if(format == 16)
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34 soundsystem->buffersize = buffersize * sizeof(short);
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35
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36 soundsystem->mixbuffer = (s8*)SDL_malloc(soundsystem->buffersize);
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37 //soundsystem->soundbuffer = soundsystem->mixbuffer;
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38 soundsystem->format = format;
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39 soundsystem->channel = channel;
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40 soundsystem->prevtimer = 0;
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41 soundsystem->soundcursor = 0;
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42 soundsystem->numsamples = 0;
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43 soundsystem->period = 0x1000000 / rate;
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44 soundsystem->cmd = INIT;
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45 }
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46
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47 void SoundStartMixer(void)
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48 {
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49 soundsystem->cmd |= MIX;
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50 }
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51
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52 void SendCommandToArm7(u32 command)
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53 {
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54 while (REG_IPC_FIFO_CR & IPC_FIFO_SEND_FULL);
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55 if (REG_IPC_FIFO_CR & IPC_FIFO_ERROR)
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56 {
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57 REG_IPC_FIFO_CR |= IPC_FIFO_SEND_CLEAR;
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58 }
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59
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60 REG_IPC_FIFO_TX = command;
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61 }