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annotate src/audio/mint/SDL_mintaudio.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
parents a1b03ba2fcd0
children
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 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 MiNT audio driver
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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 #ifndef _SDL_mintaudio_h
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31 #define _SDL_mintaudio_h
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32
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33 #include "../SDL_sysaudio.h"
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34 #include "SDL_mintaudio_stfa.h"
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35
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36 /* Hidden "this" pointer for the audio functions */
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37 #define _THIS SDL_AudioDevice *this
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38
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39 /* 16 predivisors with 3 clocks max. */
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40 #define MINTAUDIO_maxfreqs (16*3)
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41
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42 typedef struct {
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43 Uint32 frequency;
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44 Uint32 masterclock;
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45 Uint32 predivisor;
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46 int gpio_bits; /* in case of external clock */
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47 } mint_frequency_t;
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48
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49 struct SDL_PrivateAudioData {
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50 mint_frequency_t frequencies[MINTAUDIO_maxfreqs];
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51 int freq_count; /* Number of frequencies in the array */
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52 int numfreq; /* Number of selected frequency */
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53 };
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54
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55 /* Old variable names */
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56
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57 #define MINTAUDIO_frequencies (this->hidden->frequencies)
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58 #define MINTAUDIO_freqcount (this->hidden->freq_count)
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59 #define MINTAUDIO_numfreq (this->hidden->numfreq)
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60
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61 /* _MCH cookie (values>>16) */
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62 enum {
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63 MCH_ST=0,
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64 MCH_STE,
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65 MCH_TT,
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66 MCH_F30,
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67 MCH_CLONE,
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68 MCH_ARANYM
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69 };
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70
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71 /* Master clocks for replay frequencies */
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72 #define MASTERCLOCK_STE 8010666 /* Not sure of this one */
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73 #define MASTERCLOCK_TT 16107953 /* Not sure of this one */
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74 #define MASTERCLOCK_FALCON1 25175000
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75 #define MASTERCLOCK_FALCON2 32000000 /* Only usable for DSP56K */
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76 #define MASTERCLOCK_FALCONEXT -1 /* Clock on DSP56K port, unknown */
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77 #define MASTERCLOCK_44K 22579200 /* Standard clock for 44.1 Khz */
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78 #define MASTERCLOCK_48K 24576000 /* Standard clock for 48 Khz */
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79
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80 /* Master clock predivisors */
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81 #define MASTERPREDIV_STE 160
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82 #define MASTERPREDIV_TT 320
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83 #define MASTERPREDIV_FALCON 256
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84 #define MASTERPREDIV_MILAN 256
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85
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86 /* MFP 68901 interrupt sources */
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87 #ifndef MFP_PARALLEL
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88 enum {
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89 MFP_PARALLEL=0,
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90 MFP_DCD,
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91 MFP_CTS,
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92 MFP_BITBLT,
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93 MFP_TIMERD,
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94 MFP_BAUDRATE=MFP_TIMERD,
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95 MFP_TIMERC,
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96 MFP_200HZ=MFP_TIMERC,
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97 MFP_ACIA,
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98 MFP_DISK,
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99 MFP_TIMERB,
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100 MFP_HBLANK=MFP_TIMERB,
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101 MFP_TERR,
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102 MFP_TBE,
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103 MFP_RERR,
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104 MFP_RBF,
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105 MFP_TIMERA,
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106 MFP_DMASOUND=MFP_TIMERA,
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107 MFP_RING,
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108 MFP_MONODETECT
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109 };
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110 #endif
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111
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112 /* Xbtimer() timers */
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113 #ifndef XB_TIMERA
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114 enum {
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115 XB_TIMERA=0,
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116 XB_TIMERB,
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117 XB_TIMERC,
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118 XB_TIMERD
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119 };
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120 #endif
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121
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122 /* Variables */
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123 extern SDL_AudioDevice *SDL_MintAudio_device;
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124 extern Uint8 *SDL_MintAudio_audiobuf[2]; /* Pointers to buffers */
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125 extern unsigned long SDL_MintAudio_audiosize; /* Length of audio buffer=spec->size */
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126 extern volatile unsigned short SDL_MintAudio_numbuf; /* Buffer to play */
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127 extern volatile unsigned short SDL_MintAudio_mutex;
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128 extern cookie_stfa_t *SDL_MintAudio_stfa;
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129 extern volatile unsigned long SDL_MintAudio_clocktics;
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130 extern unsigned short SDL_MintAudio_hasfpu; /* To preserve fpu registers if needed */
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131
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132 /* MiNT thread variables */
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133 extern SDL_bool SDL_MintAudio_mint_present;
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134 extern SDL_bool SDL_MintAudio_quit_thread;
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135 extern SDL_bool SDL_MintAudio_thread_finished;
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136 extern long SDL_MintAudio_thread_pid;
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137
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138 /* Functions */
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139 void SDL_MintAudio_Callback(void);
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140 void SDL_MintAudio_AddFrequency(_THIS, Uint32 frequency, Uint32 clock,
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parents: 1079
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141 Uint32 prediv, int gpio_bits);
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parents: 769
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142 int SDL_MintAudio_SearchFrequency(_THIS, int desired_freq);
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143 void SDL_MintAudio_CheckFpu(void);
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144
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145 /* MiNT thread functions */
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parents: 1107
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146 int SDL_MintAudio_Thread(long param);
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Patrice Mandin <patmandin@gmail.com>
parents: 1107
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147 void SDL_MintAudio_WaitThread(void);
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parents: 1107
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148
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parents: 398
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149 /* ASM interrupt functions */
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150 void SDL_MintAudio_GsxbInterrupt(void);
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parents: 398
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151 void SDL_MintAudio_EmptyGsxbInterrupt(void);
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parents: 769
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152 void SDL_MintAudio_XbiosInterruptMeasureClock(void);
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153 void SDL_MintAudio_XbiosInterrupt(void);
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154 void SDL_MintAudio_Dma8Interrupt(void);
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155 void SDL_MintAudio_StfaInterrupt(void);
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156
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Sam Lantinga <slouken@libsdl.org>
parents:
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157 #endif /* _SDL_mintaudio_h */