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annotate src/audio/dc/SDL_dcaudio.c @ 1295:c3e36ac8a94c

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Date: Sun, 6 Mar 2005 17:06:20 +0100 From: Per Inge Mathisen Subject: [SDL] Fullscreen refresh on win32 Windows has a terrible default for fullscreen 3D apps of 60mhz refresh rate. This can be fixed by the user by going into his driver's control panel and forcing the refresh rate higher. However, this not a very user friendly way about it, and in any case SDL contains no code that could figure out this that condition has afflicted the user. So the question is, could SDL fix this for the user? It is possible under Windows to request a higher refresh rate. The danger is of course that if the user has an old monitor, and you request a too high refresh rate, the monitor could be damaged. However, I believe there might be a way around that: Check before switching what refresh rate the user's desktop runs in, and if our fullscreen dimensions are equal or less than those of the desktop, use the higher refresh rate of 60 and the desktop rate. Since most users run their desktops in the same or higher resolution something sane, this should fix this problem for most users. Thoughts? An alternative is to add an SDL_GL_GetAttribute(SDL_GL_REFRESH_RATE) option so that programs can bitch at their users at their own convenience. - Per
author Sam Lantinga <slouken@libsdl.org>
date Mon, 30 Jan 2006 06:56:10 +0000
parents b8d311d90021
children c9b51268668f
rev   line source
509
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
509
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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 BERO <bero@geocities.co.jp>
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20 based on SDL_diskaudio.c by Sam Lantinga <slouken@libsdl.org>
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21
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22 */
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23
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24 #ifdef SAVE_RCSID
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25 static char rcsid =
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26 "@(#) $Id$";
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27 #endif
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28
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29 /* Output dreamcast aica */
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30
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31 #include <stdlib.h>
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32 #include <stdio.h>
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33 #include <string.h>
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34 #include <errno.h>
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35 #include <unistd.h>
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36 #include <sys/stat.h>
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37 #include <sys/types.h>
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38 #include <sys/stat.h>
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39 #include <fcntl.h>
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40
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41
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42 #include "SDL_audio.h"
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43 #include "SDL_error.h"
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44 #include "SDL_audiomem.h"
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45 #include "SDL_audio_c.h"
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46 #include "SDL_timer.h"
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47 #include "SDL_audiodev_c.h"
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48 #include "SDL_dcaudio.h"
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49
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50 #include "aica.h"
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51 #include <dc/spu.h>
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52
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53 /* Audio driver functions */
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54 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec);
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55 static void DCAUD_WaitAudio(_THIS);
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56 static void DCAUD_PlayAudio(_THIS);
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57 static Uint8 *DCAUD_GetAudioBuf(_THIS);
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58 static void DCAUD_CloseAudio(_THIS);
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59
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60 /* Audio driver bootstrap functions */
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61 static int DCAUD_Available(void)
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62 {
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63 return 1;
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64 }
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65
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66 static void DCAUD_DeleteDevice(SDL_AudioDevice *device)
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67 {
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68 free(device->hidden);
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69 free(device);
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70 }
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71
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72 static SDL_AudioDevice *DCAUD_CreateDevice(int devindex)
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73 {
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74 SDL_AudioDevice *this;
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75
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76 /* Initialize all variables that we clean on shutdown */
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77 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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78 if ( this ) {
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79 memset(this, 0, (sizeof *this));
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80 this->hidden = (struct SDL_PrivateAudioData *)
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81 malloc((sizeof *this->hidden));
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82 }
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83 if ( (this == NULL) || (this->hidden == NULL) ) {
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84 SDL_OutOfMemory();
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85 if ( this ) {
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86 free(this);
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87 }
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88 return(0);
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89 }
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90 memset(this->hidden, 0, (sizeof *this->hidden));
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91
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92 /* Set the function pointers */
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93 this->OpenAudio = DCAUD_OpenAudio;
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94 this->WaitAudio = DCAUD_WaitAudio;
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95 this->PlayAudio = DCAUD_PlayAudio;
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96 this->GetAudioBuf = DCAUD_GetAudioBuf;
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97 this->CloseAudio = DCAUD_CloseAudio;
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98
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99 this->free = DCAUD_DeleteDevice;
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100
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101 spu_init();
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102
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103 return this;
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104 }
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105
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106 AudioBootStrap DCAUD_bootstrap = {
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107 "dcaudio", "Dreamcast AICA audio",
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108 DCAUD_Available, DCAUD_CreateDevice
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109 };
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110
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111 /* This function waits until it is possible to write a full sound buffer */
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112 static void DCAUD_WaitAudio(_THIS)
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113 {
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114 if (this->hidden->playing) {
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115 /* wait */
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116 while(aica_get_pos(0)/this->spec.samples == this->hidden->nextbuf) {
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117 thd_pass();
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118 }
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119 }
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120 }
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121
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122 #define SPU_RAM_BASE 0xa0800000
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123
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124 static void spu_memload_stereo8(int leftpos,int rightpos,void *src0,size_t size)
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125 {
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126 uint8 *src = src0;
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127 uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE);
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128 uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);
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129 size = (size+7)/8;
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130 while(size--) {
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131 unsigned lval,rval;
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132 lval = *src++;
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133 rval = *src++;
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134 lval|= (*src++)<<8;
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135 rval|= (*src++)<<8;
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136 lval|= (*src++)<<16;
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137 rval|= (*src++)<<16;
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138 lval|= (*src++)<<24;
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139 rval|= (*src++)<<24;
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140 g2_write_32(left++,lval);
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141 g2_write_32(right++,rval);
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142 g2_fifo_wait();
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143 }
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144 }
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145
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
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146 static void spu_memload_stereo16(int leftpos,int rightpos,void *src0,size_t size)
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147 {
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148 uint16 *src = src0;
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149 uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE);
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150 uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE);
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151 size = (size+7)/8;
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152 while(size--) {
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153 unsigned lval,rval;
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154 lval = *src++;
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155 rval = *src++;
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156 lval|= (*src++)<<16;
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157 rval|= (*src++)<<16;
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158 g2_write_32(left++,lval);
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159 g2_write_32(right++,rval);
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160 g2_fifo_wait();
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161 }
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162 }
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163
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164 static void DCAUD_PlayAudio(_THIS)
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165 {
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166 SDL_AudioSpec *spec = &this->spec;
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167 unsigned int offset;
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168
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169 if (this->hidden->playing) {
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170 /* wait */
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171 while(aica_get_pos(0)/spec->samples == this->hidden->nextbuf) {
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172 thd_pass();
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173 }
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174 }
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175
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176 offset = this->hidden->nextbuf*spec->size;
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177 this->hidden->nextbuf^=1;
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178 /* Write the audio data, checking for EAGAIN on broken audio drivers */
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179 if (spec->channels==1) {
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180 spu_memload(this->hidden->leftpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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181 } else {
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182 offset/=2;
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183 if ((this->spec.format&255)==8) {
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184 spu_memload_stereo8(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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185 } else {
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186 spu_memload_stereo16(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen);
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187 }
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188 }
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189
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190 if (!this->hidden->playing) {
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191 int mode;
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192 this->hidden->playing = 1;
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193 mode = (spec->format==AUDIO_S8)?SM_8BIT:SM_16BIT;
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194 if (spec->channels==1) {
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195 aica_play(0,mode,this->hidden->leftpos,0,spec->samples*2,spec->freq,255,128,1);
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196 } else {
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197 aica_play(0,mode,this->hidden->leftpos ,0,spec->samples*2,spec->freq,255,0,1);
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198 aica_play(1,mode,this->hidden->rightpos,0,spec->samples*2,spec->freq,255,255,1);
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199 }
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200 }
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201 }
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202
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203 static Uint8 *DCAUD_GetAudioBuf(_THIS)
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204 {
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205 return(this->hidden->mixbuf);
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206 }
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207
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208 static void DCAUD_CloseAudio(_THIS)
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209 {
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210 aica_stop(0);
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211 if (this->spec.channels==2) aica_stop(1);
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212 if ( this->hidden->mixbuf != NULL ) {
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213 SDL_FreeAudioMem(this->hidden->mixbuf);
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214 this->hidden->mixbuf = NULL;
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215 }
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216 }
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217
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diff changeset
218 static int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec)
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219 {
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diff changeset
220 switch(spec->format&0xff) {
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221 case 8: spec->format = AUDIO_S8; break;
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diff changeset
222 case 16: spec->format = AUDIO_S16LSB; break;
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diff changeset
223 default:
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diff changeset
224 SDL_SetError("Unsupported audio format");
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diff changeset
225 return(-1);
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diff changeset
226 }
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diff changeset
227
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diff changeset
228 /* Update the fragment size as size in bytes */
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diff changeset
229 SDL_CalculateAudioSpec(spec);
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diff changeset
230
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diff changeset
231 /* Allocate mixing buffer */
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diff changeset
232 this->hidden->mixlen = spec->size;
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diff changeset
233 this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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diff changeset
234 if ( this->hidden->mixbuf == NULL ) {
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diff changeset
235 return(-1);
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parents:
diff changeset
236 }
dad72daf44b3 Added initial support for Dreamcast (thanks HERO!)
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 memset(this->hidden->mixbuf, spec->silence, spec->size);
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diff changeset
238 this->hidden->leftpos = 0x11000;
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diff changeset
239 this->hidden->rightpos = 0x11000+spec->size;
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diff changeset
240 this->hidden->playing = 0;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
241 this->hidden->nextbuf = 0;
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parents:
diff changeset
242
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parents:
diff changeset
243 /* We're ready to rock and roll. :-) */
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diff changeset
244 return(0);
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diff changeset
245 }