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annotate src/audio/mint/SDL_mintaudio_xbios.c @ 889:eac8c69b5706

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ate: Fri, 09 Apr 2004 20:07:10 +0200 From: Hibernatus Subject: [SDL] BUG: changing video mode in opengl + windows In WIN_GL_SetupWindow (SDL12/src/video/wincommon/SDL_wingl.c) you call WIN_GL_ResetWindow when SetPixelFormat fails. WIN_GL_ResetWindow cannot properly work in its current state, because there are several things to update once you've created a new window. At least DirectInput doesn't work anymore here (which is somewhat annoying for the player :). I think you can simply remove that function. Many games don't try to recover from that exception, that's why the newest ATI drivers emulate 16 bpp display in 32 bpp mode so the error never occurs (but the games may run much slower). Having SDL_SetVideoMode return NULL would be better than actually setting the video mode and losing focus, directinput and maybe directsound too. It also made my previous drivers crash (when switching from 32 bpp windowed to 16 bpp fullscreen).
author Sam Lantinga <slouken@libsdl.org>
date Sun, 16 May 2004 18:02:48 +0000
parents b8d311d90021
children 185acc07127a
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga
644
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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 MiNT audio driver
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25 using XBIOS functions (Falcon)
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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 #include <stdlib.h>
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31 #include <stdio.h>
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32 #include <string.h>
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33
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34 /* Mint includes */
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35 #include <mint/osbind.h>
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36 #include <mint/falcon.h>
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37 #include <mint/cookie.h>
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38
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39 #include "SDL_endian.h"
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40 #include "SDL_audio.h"
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41 #include "SDL_audio_c.h"
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42 #include "SDL_audiomem.h"
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43 #include "SDL_sysaudio.h"
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44
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45 #include "SDL_atarimxalloc_c.h"
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46
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47 #include "SDL_mintaudio.h"
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48
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49 /*--- Defines ---*/
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50
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51 #define MINT_AUDIO_DRIVER_NAME "mint_xbios"
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52
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53 /* Debug print info */
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54 #define DEBUG_NAME "audio:xbios: "
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55 #if 0
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56 #define DEBUG_PRINT(what) \
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57 { \
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58 printf what; \
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59 }
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60 #else
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61 #define DEBUG_PRINT(what)
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62 #endif
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63
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64 /*--- Static variables ---*/
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65
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66 static unsigned long cookie_snd;
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67
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68 /*--- Audio driver functions ---*/
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69
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70 static void Mint_CloseAudio(_THIS);
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71 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec);
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72 static void Mint_LockAudio(_THIS);
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73 static void Mint_UnlockAudio(_THIS);
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74
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75 /* To check/init hardware audio */
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76 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec);
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77 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
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78
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79 /*--- Audio driver bootstrap functions ---*/
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80
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81 static int Audio_Available(void)
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82 {
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83 const char *envr = getenv("SDL_AUDIODRIVER");
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84
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85 /* Check if user asked a different audio driver */
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86 if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
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87 DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));
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88 return(0);
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89 }
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90
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91 /* Cookie _SND present ? if not, assume ST machine */
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92 if (Getcookie(C__SND, &cookie_snd) == C_NOTFOUND) {
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93 cookie_snd = SND_PSG;
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94 }
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95
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96 /* Check if we have 16 bits audio */
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97 if ((cookie_snd & SND_16BIT)==0) {
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98 DEBUG_PRINT((DEBUG_NAME "no 16 bits sound\n"));
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99 return(0);
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100 }
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101
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102 /* Check if audio is lockable */
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103 if (Locksnd()!=1) {
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104 DEBUG_PRINT((DEBUG_NAME "audio locked by other application\n"));
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105 return(0);
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106 }
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107
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108 Unlocksnd();
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109
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110 DEBUG_PRINT((DEBUG_NAME "XBIOS audio available!\n"));
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111 return(1);
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112 }
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113
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114 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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115 {
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116 free(device->hidden);
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117 free(device);
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118 }
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119
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120 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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121 {
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122 SDL_AudioDevice *this;
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123
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124 /* Initialize all variables that we clean on shutdown */
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125 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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126 if ( this ) {
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127 memset(this, 0, (sizeof *this));
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128 this->hidden = (struct SDL_PrivateAudioData *)
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129 malloc((sizeof *this->hidden));
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130 }
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131 if ( (this == NULL) || (this->hidden == NULL) ) {
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132 SDL_OutOfMemory();
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133 if ( this ) {
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134 free(this);
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135 }
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136 return(0);
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137 }
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138 memset(this->hidden, 0, (sizeof *this->hidden));
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139
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140 /* Set the function pointers */
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141 this->OpenAudio = Mint_OpenAudio;
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142 this->CloseAudio = Mint_CloseAudio;
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143 this->LockAudio = Mint_LockAudio;
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144 this->UnlockAudio = Mint_UnlockAudio;
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145 this->free = Audio_DeleteDevice;
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146
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147 return this;
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148 }
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149
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150 AudioBootStrap MINTAUDIO_XBIOS_bootstrap = {
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151 MINT_AUDIO_DRIVER_NAME, "MiNT XBIOS audio driver",
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152 Audio_Available, Audio_CreateDevice
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153 };
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154
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155 static void Mint_LockAudio(_THIS)
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156 {
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157 /* Stop replay */
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158 Buffoper(0);
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159 }
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160
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161 static void Mint_UnlockAudio(_THIS)
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162 {
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diff changeset
163 /* Restart replay */
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164 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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165 }
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166
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167 static void Mint_CloseAudio(_THIS)
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168 {
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169 /* Stop replay */
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170 Buffoper(0);
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171
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172 /* Uninstall interrupt */
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173 Jdisint(MFP_DMASOUND);
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174
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175 /* Wait if currently playing sound */
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176 while (SDL_MintAudio_mutex != 0) {
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177 }
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178
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179 /* Clear buffers */
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180 if (SDL_MintAudio_audiobuf[0]) {
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181 Mfree(SDL_MintAudio_audiobuf[0]);
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182 SDL_MintAudio_audiobuf[0] = SDL_MintAudio_audiobuf[1] = NULL;
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183 }
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184
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185 /* Unlock sound system */
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186 Unlocksnd();
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187 }
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188
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189 static int Mint_CheckAudio(_THIS, SDL_AudioSpec *spec)
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190 {
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191 int i;
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192
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193 DEBUG_PRINT((DEBUG_NAME "asked: %d bits, ",spec->format & 0x00ff));
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194 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
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195 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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196 DEBUG_PRINT(("channels=%d, ", spec->channels));
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197 DEBUG_PRINT(("freq=%d\n", spec->freq));
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198
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199 spec->format |= 0x8000; /* Audio is always signed */
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200 if ((spec->format & 0x00ff)==16) {
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201 spec->format |= 0x1000; /* Audio is always big endian */
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202 spec->channels=2; /* 16 bits always stereo */
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203 }
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204
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205 /* FIXME: check for an external clock */
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206 MINTAUDIO_sfreq=1;
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207 MINTAUDIO_nfreq=12;
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208 for (i=MINTAUDIO_sfreq;i<MINTAUDIO_nfreq;i++) {
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209 MINTAUDIO_hardfreq[i]=MASTERCLOCK_FALCON1/(MASTERPREDIV_FALCON*(i+1));
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210 DEBUG_PRINT((DEBUG_NAME "calc:freq(%d)=%lu\n", i, MINTAUDIO_hardfreq[i]));
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211 }
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212
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213 MINTAUDIO_numfreq=SDL_MintAudio_SearchFrequency(this, 1, spec->freq);
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214 spec->freq=MINTAUDIO_hardfreq[MINTAUDIO_numfreq];
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215
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216 DEBUG_PRINT((DEBUG_NAME "obtained: %d bits, ",spec->format & 0x00ff));
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217 DEBUG_PRINT(("signed=%d, ", ((spec->format & 0x8000)!=0)));
704
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diff changeset
218 DEBUG_PRINT(("big endian=%d, ", ((spec->format & 0x1000)!=0)));
644
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219 DEBUG_PRINT(("channels=%d, ", spec->channels));
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220 DEBUG_PRINT(("freq=%d\n", spec->freq));
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221
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222 return 0;
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223 }
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224
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225 static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec)
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226 {
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227 int channels_mode;
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228 void *buffer;
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229
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230 /* Stop currently playing sound */
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231 Buffoper(0);
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232
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233 /* Set replay tracks */
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234 Settracks(0,0);
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235 Setmontracks(0);
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236
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237 /* Select replay format */
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238 channels_mode=STEREO16;
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diff changeset
239 switch (spec->format & 0xff) {
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diff changeset
240 case 8:
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diff changeset
241 if (spec->channels==2) {
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242 channels_mode=STEREO8;
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243 } else {
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244 channels_mode=MONO8;
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245 }
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246 break;
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247 }
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248 if (Setmode(channels_mode)<0) {
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249 DEBUG_PRINT((DEBUG_NAME "Setmode() failed\n"));
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250 }
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251
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252 /* FIXME: select an external clock */
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253
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254 Devconnect(DMAPLAY, DAC, CLK25M, MINTAUDIO_numfreq, 1);
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255 DEBUG_PRINT((DEBUG_NAME "25.175 MHz clock selected, prescaler %d\n", MINTAUDIO_numfreq));
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256
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257 /* Set buffer */
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258 buffer = SDL_MintAudio_audiobuf[SDL_MintAudio_numbuf];
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259 if (Setbuffer(0, buffer, buffer + spec->size)<0) {
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260 DEBUG_PRINT((DEBUG_NAME "Setbuffer() failed\n"));
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261 }
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262
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diff changeset
263 /* Install interrupt */
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264 Jdisint(MFP_DMASOUND);
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265 Xbtimer(XB_TIMERA, 8, 1, SDL_MintAudio_XbiosInterrupt);
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266 Jenabint(MFP_DMASOUND);
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267
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268 if (Setinterrupt(SI_TIMERA, SI_PLAY)<0) {
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269 DEBUG_PRINT((DEBUG_NAME "Setinterrupt() failed\n"));
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270 }
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271
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272 /* Go */
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273 Buffoper(SB_PLA_ENA|SB_PLA_RPT);
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274 DEBUG_PRINT((DEBUG_NAME "hardware initialized\n"));
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275 }
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276
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277 static int Mint_OpenAudio(_THIS, SDL_AudioSpec *spec)
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278 {
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diff changeset
279 /* Lock sound system */
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280 if (Locksnd()!=1) {
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281 SDL_SetError("Mint_OpenAudio: Audio system already in use");
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282 return(-1);
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283 }
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284
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285 SDL_MintAudio_device = this;
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286
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diff changeset
287 /* Check audio capabilities */
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288 if (Mint_CheckAudio(this, spec)==-1) {
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289 return -1;
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290 }
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291
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292 SDL_CalculateAudioSpec(spec);
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diff changeset
293
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294 /* Allocate memory for audio buffers in DMA-able RAM */
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295 DEBUG_PRINT((DEBUG_NAME "buffer size=%d\n", spec->size));
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296
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297 SDL_MintAudio_audiobuf[0] = Atari_SysMalloc(spec->size *2, MX_STRAM);
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298 if (SDL_MintAudio_audiobuf[0]==NULL) {
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299 SDL_SetError("MINT_OpenAudio: Not enough memory for audio buffer");
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300 return (-1);
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301 }
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302 SDL_MintAudio_audiobuf[1] = SDL_MintAudio_audiobuf[0] + spec->size ;
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303 SDL_MintAudio_numbuf=0;
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304 memset(SDL_MintAudio_audiobuf[0], spec->silence, spec->size *2);
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305 SDL_MintAudio_audiosize = spec->size;
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306 SDL_MintAudio_mutex = 0;
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307
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308 DEBUG_PRINT((DEBUG_NAME "buffer 0 at 0x%08x\n", SDL_MintAudio_audiobuf[0]));
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309 DEBUG_PRINT((DEBUG_NAME "buffer 1 at 0x%08x\n", SDL_MintAudio_audiobuf[1]));
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310
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311 /* Setup audio hardware */
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312 Mint_InitAudio(this, spec);
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313
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314 return(1); /* We don't use threaded audio */
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315 }