Mercurial > sdl-ios-xcode
annotate src/timer/amigaos/SDL_systimer.c @ 1295:c3e36ac8a94c
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 |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #include <stdio.h> | |
|
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29 #include <time.h> |
| 0 | 30 #include <signal.h> |
| 31 #include <unistd.h> | |
| 32 #include <string.h> | |
| 33 #include <errno.h> | |
|
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34 #include <exec/types.h> |
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35 #ifdef __SASC |
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36 #include <proto/dos.h> |
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37 #include <clib/graphics_protos.h> |
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38 #include <pragmas/graphics.h> |
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39 #include <clib/exec_protos.h> |
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40 #include <pragmas/exec.h> |
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41 #elif defined(STORMC4_WOS) |
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42 #include <proto/dos.h> |
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43 #include <proto/exec.h> |
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44 #include <proto/graphics.h> |
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45 #else |
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46 #include <inline/dos.h> |
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47 #include <inline/exec.h> |
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48 #include <inline/graphics.h> |
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49 #endif |
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50 #include "mydebug.h" |
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51 |
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52 extern struct DosLibrary *DOSBase; |
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53 extern struct ExecBase *SysBase; |
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54 static struct GfxBase *GfxBase; |
| 0 | 55 |
| 56 #include "SDL_error.h" | |
| 57 #include "SDL_timer.h" | |
| 58 #include "SDL_timer_c.h" | |
| 59 | |
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60 #if defined(DISABLE_THREADS) || defined(FORK_HACK) |
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61 #define USE_ITIMER |
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62 #endif |
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63 |
| 0 | 64 /* The first ticks value of the application */ |
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65 |
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66 #if !defined(__PPC__) || defined(STORMC4_WOS) || defined(MORPHOS) |
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67 static clock_t start; |
| 0 | 68 |
| 69 void SDL_StartTicks(void) | |
| 70 { | |
| 71 /* Set first ticks value */ | |
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72 start=clock(); |
| 0 | 73 } |
| 74 | |
| 75 Uint32 SDL_GetTicks (void) | |
| 76 { | |
|
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77 clock_t ticks; |
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78 |
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79 ticks=clock()-start; |
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80 |
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81 #ifdef __SASC |
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82 // CLOCKS_PER_SEC == 1000 ! |
| 0 | 83 |
| 84 return(ticks); | |
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85 #else |
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86 // CLOCKS_PER_SEC != 1000 ! |
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87 |
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88 return ticks*(1000/CLOCKS_PER_SEC); |
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89 #endif |
| 0 | 90 } |
| 91 | |
| 92 void SDL_Delay (Uint32 ms) | |
| 93 { | |
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94 // Do a busy wait if time is less than 50ms |
| 0 | 95 |
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96 if(ms<50) |
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97 { |
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98 clock_t to_wait=clock(); |
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99 |
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100 #ifndef __SASC |
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101 ms*=(CLOCKS_PER_SEC/1000); |
| 0 | 102 #endif |
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103 to_wait+=ms; |
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104 |
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105 while(clock()<to_wait); |
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106 } |
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107 else |
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108 { |
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109 Delay(ms/20); |
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110 } |
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111 } |
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112 |
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113 #else |
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114 |
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115 ULONG MY_CLOCKS_PER_SEC; |
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116 |
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117 void PPC_TimerInit(void); |
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118 APTR MyTimer; |
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119 |
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120 ULONG start[2]; |
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121 |
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122 void SDL_StartTicks(void) |
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123 { |
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124 /* Set first ticks value */ |
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125 if(!MyTimer) |
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126 PPC_TimerInit(); |
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127 |
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128 PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,start); |
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129 start[1]>>=10; |
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130 start[1]|=((result[0]&0x3ff)<<22); |
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131 start[0]>>=10; |
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132 } |
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133 |
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134 Uint32 SDL_GetTicks (void) |
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135 { |
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136 ULONG result[2]; |
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137 PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,result); |
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138 |
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139 // PPCAsr64p(result,10); |
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140 // Non va, la emulo: |
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141 |
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142 result[1]>>=10; |
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143 result[1]|=((result[0]&0x3ff)<<22); |
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144 |
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145 // Non mi interessa piu' result[0] |
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146 |
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147 return result[1]*1000/MY_CLOCKS_PER_SEC; |
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148 } |
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149 |
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150 void SDL_Delay (Uint32 ms) |
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151 { |
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152 // Do a busy wait if time is less than 50ms |
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153 |
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154 if(ms<50) |
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155 { |
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156 ULONG to_wait[2],actual[2]; |
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157 PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,result); |
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158 actual[1]=0; |
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159 to_wait[1]+=ms*1000/MY_CLOCKS_PER_SEC; |
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160 |
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161 while(actual[1]<to_wait[1]) |
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162 { |
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163 PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,actual); |
| 0 | 164 } |
|
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165 } |
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166 else |
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167 { |
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168 Delay(ms/50); |
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169 } |
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170 } |
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171 |
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172 void PPC_TimerInit(void) |
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173 { |
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174 struct TagItem tags[]= |
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175 { |
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176 PPCTIMERTAG_CPU,TRUE, |
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177 TAG_DONE,0 |
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178 }; |
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179 |
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180 |
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181 if(MyTimer=PPCCreateTimerObject(tags)) |
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182 { |
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183 ULONG result[2]; |
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184 |
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185 PPCGetTimerObject(MyTimer,PPCTIMERTAG_TICKSPERSEC,result); |
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186 D(bug("Timer inizializzato, TPS: %lu - %lu\n",result[0],result[1])); |
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187 // PPCAsr64p(result,10); |
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188 result[1]>>=10; |
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189 result[1]|=((result[0]&0x3ff)<<22); |
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190 result[0]>>=10; |
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191 |
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192 D(bug("Shiftato TPS: %lu - %lu\n",result[0],result[1])); |
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193 MY_CLOCKS_PER_SEC=result[1]; |
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194 |
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195 PPCGetTimerObject(MyTimer,PPCTIMERTAG_CURRENTTICKS,result); |
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196 |
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197 D(bug("Current ticks: %lu - %lu\n",result[0],result[1])); |
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198 result[1]>>=10; |
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199 result[1]|=((result[0]&0x3ff)<<22); |
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200 result[0]>>=10; |
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201 // PPCAsr64p(result,10); |
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202 D(bug("Shiftato: %lu - %lu\n",result[0],result[1])); |
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203 } |
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204 else |
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205 { |
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206 D(bug("Errore nell'inizializzazione del timer!\n")); |
|
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207 } |
|
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208 } |
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209 |
| 0 | 210 #endif |
| 211 | |
| 212 #include "SDL_thread.h" | |
| 213 | |
| 214 /* Data to handle a single periodic alarm */ | |
| 215 static int timer_alive = 0; | |
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216 static SDL_Thread *timer_thread = NULL; |
| 0 | 217 |
| 218 static int RunTimer(void *unused) | |
| 219 { | |
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220 D(bug("SYSTimer: Entering RunTimer loop...")); |
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221 |
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222 if(GfxBase==NULL) |
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223 GfxBase=(struct GfxBase *)OpenLibrary("graphics.library",37); |
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224 |
| 0 | 225 while ( timer_alive ) { |
| 226 if ( SDL_timer_running ) { | |
| 227 SDL_ThreadedTimerCheck(); | |
| 228 } | |
|
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229 if(GfxBase) |
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230 WaitTOF(); // Check the timer every fifth of seconds. Was SDL_Delay(1)->BusyWait! |
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231 else |
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232 Delay(1); |
| 0 | 233 } |
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234 D(bug("SYSTimer: EXITING RunTimer loop...")); |
| 0 | 235 return(0); |
| 236 } | |
| 237 | |
| 238 /* This is only called if the event thread is not running */ | |
| 239 int SDL_SYS_TimerInit(void) | |
| 240 { | |
|
255
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241 D(bug("Creating thread for the timer (NOITIMER)...\n")); |
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242 |
| 0 | 243 timer_alive = 1; |
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244 timer_thread = SDL_CreateThread(RunTimer, NULL); |
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245 if ( timer_thread == NULL ) |
| 0 | 246 { |
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247 D(bug("Creazione del thread fallita...\n")); |
| 0 | 248 |
| 249 return(-1); | |
| 250 } | |
| 251 return(SDL_SetTimerThreaded(1)); | |
| 252 } | |
| 253 | |
| 254 void SDL_SYS_TimerQuit(void) | |
| 255 { | |
| 256 timer_alive = 0; | |
|
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257 if ( timer_thread ) { |
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258 SDL_WaitThread(timer_thread, NULL); |
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259 timer_thread = NULL; |
| 0 | 260 } |
| 261 } | |
| 262 | |
| 263 int SDL_SYS_StartTimer(void) | |
| 264 { | |
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265 SDL_SetError("Internal logic error: AmigaOS uses threaded timer"); |
| 0 | 266 return(-1); |
| 267 } | |
| 268 | |
| 269 void SDL_SYS_StopTimer(void) | |
| 270 { | |
| 271 return; | |
| 272 } |