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annotate src/audio/mint/SDL_mintaudio_dma8.h @ 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
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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 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 DMA 8bits and Falcon Codec audio definitions
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26
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27 Patrice Mandin, Didier Méquignon
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28 */
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29
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30 #ifndef _SDL_mintaudio_dma8_h
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31 #define _SDL_mintaudio_dma8_h
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32
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33 #define DMAAUDIO_IO_BASE (0xffff8900)
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34 struct DMAAUDIO_IO_S {
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35 unsigned char int_ctrl;
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36 unsigned char control;
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37
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38 unsigned char dummy1;
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39 unsigned char start_high;
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40 unsigned char dummy2;
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41 unsigned char start_mid;
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42 unsigned char dummy3;
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43 unsigned char start_low;
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44
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45 unsigned char dummy4;
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46 unsigned char cur_high;
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47 unsigned char dummy5;
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48 unsigned char cur_mid;
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49 unsigned char dummy6;
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50 unsigned char cur_low;
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51
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52 unsigned char dummy7;
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53 unsigned char end_high;
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54 unsigned char dummy8;
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55 unsigned char end_mid;
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56 unsigned char dummy9;
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57 unsigned char end_low;
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58
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59 unsigned char dummy10[12];
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60
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61 unsigned char track_ctrl; /* CODEC only */
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62 unsigned char sound_ctrl;
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63 unsigned short sound_data;
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64 unsigned short sound_mask;
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65
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66 unsigned char dummy11[10];
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67
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68 unsigned short dev_ctrl;
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69 unsigned short dest_ctrl;
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70 unsigned short sync_div;
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71 unsigned char track_rec;
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72 unsigned char adderin_input;
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73 unsigned char channel_input;
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74 unsigned char channel_amplification;
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75 unsigned char channel_reduction;
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76
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77 unsigned char dummy12[6];
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78
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79 unsigned char data_direction;
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80 unsigned char dummy13;
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81 unsigned char dev_data;
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82 };
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83 #define DMAAUDIO_IO ((*(volatile struct DMAAUDIO_IO_S *)DMAAUDIO_IO_BASE))
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84
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85 #endif /* _SDL_mintaudio_dma8_h */