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annotate src/timer/riscos/SDL_systimer.c @ 769:b8d311d90021

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Updated copyright information for 2004 (Happy New Year!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 16:49:27 +0000
parents 550bccdf04bd
children d74fbf56f2f6
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
769
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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 /* Timer start/reset time */
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40 static Uint32 timerStart;
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41 /* Timer running function */
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42 void RISCOS_CheckTimer();
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43
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44 extern void RISCOS_BackgroundTasks(void);
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45
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46 /* The first ticks value of the application */
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47 clock_t start;
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48
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49 void SDL_StartTicks(void)
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50 {
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51 /* Set first ticks value */
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52 start = clock();
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53 }
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54
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55 Uint32 SDL_GetTicks (void)
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56 {
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57 clock_t ticks;
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58
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59 ticks=clock()-start;
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60
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61
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62 #if CLOCKS_PER_SEC == 1000
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63
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64 return(ticks);
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65
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66 #elif CLOCKS_PER_SEC == 100
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67
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68 return (ticks * 10);
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69
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70 #else
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71
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72 return ticks*(1000/CLOCKS_PER_SEC);
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73
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74 #endif
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75
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76 }
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77
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78 extern void DRenderer_FillBuffers();
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79
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80 void SDL_Delay (Uint32 ms)
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81 {
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82 Uint32 now,then,elapsed;
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83
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84 /* Set the timeout interval - Linux only needs to do this once */
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85 then = SDL_GetTicks();
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86
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87 do {
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88 /* Do background tasks required while sleeping as we are not multithreaded */
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89 RISCOS_BackgroundTasks();
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90 /* Calculate the time interval left (in case of interrupt) */
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91 now = SDL_GetTicks();
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92 elapsed = (now-then);
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93 then = now;
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94 if ( elapsed >= ms ) {
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95 break;
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96 }
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97 ms -= elapsed;
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98
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99 } while ( 1 );
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100 }
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101
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102 int SDL_SYS_TimerInit(void)
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103 {
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104 return(0);
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105 }
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106
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107 void SDL_SYS_TimerQuit(void)
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108 {
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109 SDL_SetTimer(0, NULL);
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110 }
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111
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112 int SDL_SYS_StartTimer(void)
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113 {
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114 timerStart = SDL_GetTicks();
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115
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116 return(0);
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117 }
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118
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119 void SDL_SYS_StopTimer(void)
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120 {
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121 /* Don't need to do anything as we use SDL_timer_running
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122 to detect if we need to check the timer */
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123 }
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124
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125
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126 void RISCOS_CheckTimer()
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127 {
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128 if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval)
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129 {
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130 Uint32 ms;
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131
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132 ms = SDL_alarm_callback(SDL_alarm_interval);
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133 if ( ms != SDL_alarm_interval )
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134 {
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135 if ( ms )
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136 {
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137 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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138 } else
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139 {
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140 SDL_alarm_interval = 0;
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141 SDL_timer_running = 0;
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142 }
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143 }
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144 if (SDL_alarm_interval) timerStart = SDL_GetTicks();
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145 }
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146 }