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annotate src/timer/riscos/SDL_systimer.c @ 1029:f87f87efd45a

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Date: Mon, 17 Jan 2005 20:54:50 +0200 From: Ville [snip] Subject: [PATCH] SDL/DirectFB: remove Matrox CRTC2 flicker filter Hi, This patch removes the flicker filter option from the DirectFB backend's Matrox CRTC2 code in SDL. I will be removing the option from DirectFB (because it doesn't actually work) and that would cause the SDL code to fail without this fix. I was going to send this to some SDL list directly but libsdl.org is down so I'm not sure what if any lists there are. Thomas Jarosch (the guy who wrote the code) said you would accept SDL patches. Let me know if I should send this somewhere else. -- Ville Syrj�l� syrjala _at sci.fi http://www.sci.fi/~syrjala/
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 17 Jan 2005 19:38:28 +0000
parents d74fbf56f2f6
children 974ba6ae0fa3
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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
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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@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdio.h>
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29 #include <time.h>
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30 #include <sys/time.h>
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31 #include <unistd.h>
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32 #include <string.h>
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33 #include <errno.h>
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34
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35 #include "SDL_error.h"
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36 #include "SDL_timer.h"
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37 #include "SDL_timer_c.h"
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38
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39 #ifdef DISABLE_THREADS
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40 /* Timer start/reset time */
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41 static Uint32 timerStart;
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42 /* Timer running function */
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43 void RISCOS_CheckTimer();
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44 #else
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45 #include <pthread.h>
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46 extern Uint32 riscos_main_thread;
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47 extern int riscos_using_threads;
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48 extern Uint32 SDL_ThreadID();
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49 extern Uint32 SDL_EventThreadID(void);
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50 #endif
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51
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52
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53 extern void RISCOS_BackgroundTasks(void);
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54
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55 /* The first ticks value of the application */
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56 clock_t start;
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57
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58 void SDL_StartTicks(void)
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59 {
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60 /* Set first ticks value */
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61 start = clock();
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62 }
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63
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64 Uint32 SDL_GetTicks (void)
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65 {
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66 clock_t ticks;
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67
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68 ticks=clock()-start;
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69
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70
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71 #if CLOCKS_PER_SEC == 1000
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72
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73 return(ticks);
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74
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75 #elif CLOCKS_PER_SEC == 100
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76
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77 return (ticks * 10);
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78
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79 #else
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80
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81 return ticks*(1000/CLOCKS_PER_SEC);
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82
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83 #endif
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84
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85 }
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86
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87 void SDL_Delay (Uint32 ms)
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88 {
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89 Uint32 now,then,elapsed;
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90 #ifndef DISABLE_THREADS
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91 int is_event_thread;
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92 if (riscos_using_threads)
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93 {
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94 is_event_thread = 0;
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95 if (SDL_EventThreadID())
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96 {
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97 if (SDL_EventThreadID() == SDL_ThreadID()) is_event_thread = 1;
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98 } else if (SDL_ThreadID() == riscos_main_thread) is_event_thread = 1;
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99 } else is_event_thread = 1;
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100 #endif
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101
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102 /*TODO: Next version of unixlib may allow us to use usleep here */
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103 /* for non event threads */
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104
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105 /* Set the timeout interval - Linux only needs to do this once */
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106 then = SDL_GetTicks();
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107
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108 do {
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109 /* Do background tasks required while sleeping as we are not multithreaded */
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110 #ifdef DISABLE_THREADS
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111 RISCOS_BackgroundTasks();
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112 #else
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113 /* For threaded build only run background tasks in event thread */
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114 if (is_event_thread) RISCOS_BackgroundTasks();
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115 #endif
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116
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117 /* Calculate the time interval left (in case of interrupt) */
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118 now = SDL_GetTicks();
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119 elapsed = (now-then);
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120 then = now;
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121 if ( elapsed >= ms ) {
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122 break;
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123 }
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124 ms -= elapsed;
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125 #ifndef DISABLE_THREADS
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126 /* Need to yield to let other threads have a go */
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127 if (riscos_using_threads) pthread_yield();
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128 #endif
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129
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130 } while ( 1 );
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131 }
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132
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133 #ifdef DISABLE_THREADS
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134
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135 /* Non-threaded version of timer */
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136
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137 int SDL_SYS_TimerInit(void)
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138 {
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139 return(0);
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140 }
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141
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142 void SDL_SYS_TimerQuit(void)
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143 {
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144 SDL_SetTimer(0, NULL);
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145 }
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146
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147 int SDL_SYS_StartTimer(void)
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148 {
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149 timerStart = SDL_GetTicks();
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150
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151 return(0);
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152 }
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153
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154 void SDL_SYS_StopTimer(void)
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155 {
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156 /* Don't need to do anything as we use SDL_timer_running
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157 to detect if we need to check the timer */
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158 }
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159
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160
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161 void RISCOS_CheckTimer()
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162 {
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163 if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval)
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164 {
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165 Uint32 ms;
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166
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167 ms = SDL_alarm_callback(SDL_alarm_interval);
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168 if ( ms != SDL_alarm_interval )
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169 {
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170 if ( ms )
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171 {
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172 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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173 } else
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174 {
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175 SDL_alarm_interval = 0;
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176 SDL_timer_running = 0;
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177 }
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178 }
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179 if (SDL_alarm_interval) timerStart = SDL_GetTicks();
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180 }
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181 }
955
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182
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183 #else
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184
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185 /* Threaded version of timer - based on code for linux */
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186
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187 #include "SDL_thread.h"
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188
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189 /* Data to handle a single periodic alarm */
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190 static int timer_alive = 0;
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191 static SDL_Thread *timer = NULL;
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192
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193 static int RunTimer(void *unused)
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194 {
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195 while ( timer_alive ) {
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196 if ( SDL_timer_running ) {
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197 SDL_ThreadedTimerCheck();
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198 }
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199 SDL_Delay(1);
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200 }
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201 return(0);
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202 }
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203
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204 /* This is only called if the event thread is not running */
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205 int SDL_SYS_TimerInit(void)
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206 {
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207 timer_alive = 1;
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208 timer = SDL_CreateThread(RunTimer, NULL);
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209 if ( timer == NULL )
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210 return(-1);
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211 return(SDL_SetTimerThreaded(1));
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212 }
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213
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214 void SDL_SYS_TimerQuit(void)
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215 {
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216 timer_alive = 0;
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217 if ( timer ) {
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218 SDL_WaitThread(timer, NULL);
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219 timer = NULL;
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220 }
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221 }
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222
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223 int SDL_SYS_StartTimer(void)
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224 {
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225 SDL_SetError("Internal logic error: RISCOS uses threaded timer");
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226 return(-1);
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227 }
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228
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229 void SDL_SYS_StopTimer(void)
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230 {
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231 return;
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232 }
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233
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234 #endif /* DISABLE_THREADS */