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annotate src/timer/wince/SDL_systimer.c @ 1361:19418e4422cb

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New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children d910939febfa
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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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450721ad5436 It's now possible to build SDL without any C runtime at all on Windows,
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23 #include "SDL_windows.h"
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24 #include <mmsystem.h>
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25
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26 #include "SDL_timer.h"
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27 #include "../SDL_timer_c.h"
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28
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29 static Uint64 start_date;
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30 static Uint64 start_ticks;
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31
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32 static Uint64 wce_ticks(void)
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33 {
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34 return((Uint64)GetTickCount());
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35 }
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36
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37 static Uint64 wce_date(void)
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38 {
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39 union
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40 {
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41 FILETIME ftime;
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42 Uint64 itime;
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43 } ftime;
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44 SYSTEMTIME stime;
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45
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46 GetSystemTime(&stime);
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47 SystemTimeToFileTime(&stime,&ftime.ftime);
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48 ftime.itime/=10000; // Convert 100ns intervals to 1ms intervals
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49 // Remove ms portion, which can't be relied on
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50 ftime.itime -= (ftime.itime % 1000);
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51 return(ftime.itime);
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52 }
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53
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54 static Sint32 wce_rel_ticks(void)
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55 {
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56 return((Sint32)(wce_ticks()-start_ticks));
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57 }
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58
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59 static Sint32 wce_rel_date(void)
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60 {
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61 return((Sint32)(wce_date()-start_date));
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62 }
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63
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64 /* Return time in ms relative to when SDL was started */
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65 Uint32 SDL_GetTicks()
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66 {
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67 Sint32 offset=wce_rel_date()-wce_rel_ticks();
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68 if((offset < -1000) || (offset > 1000))
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69 {
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70 // fprintf(stderr,"Time desync(%+d), resyncing\n",offset/1000);
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71 start_ticks-=offset;
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72 }
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73
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74 return((Uint32)wce_rel_ticks());
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75 }
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76
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77 /* Give up approx. givem milliseconds to the OS. */
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78 void SDL_Delay(Uint32 ms)
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79 {
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80 Sleep(ms);
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81 }
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82
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83 /* Recard start-time of application for reference */
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84 void SDL_StartTicks(void)
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85 {
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86 start_date=wce_date();
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87 start_ticks=wce_ticks();
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88 }
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89
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90 static UINT WIN_timer;
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91
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92 int SDL_SYS_TimerInit(void)
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93 {
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94 return(0);
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95 }
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96
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97 void SDL_SYS_TimerQuit(void)
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98 {
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99 return;
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100 }
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101
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102 /* Forward declaration because this is called by the timer callback */
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103 int SDL_SYS_StartTimer(void);
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104
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105 static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime)
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106 {
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107 Uint32 ms;
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108
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109 ms = SDL_alarm_callback(SDL_alarm_interval);
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110 if ( ms != SDL_alarm_interval ) {
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111 KillTimer(NULL, idEvent);
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112 if ( ms ) {
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113 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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114 SDL_SYS_StartTimer();
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115 } else {
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116 SDL_alarm_interval = 0;
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117 }
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118 }
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119 }
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120
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121 int SDL_SYS_StartTimer(void)
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122 {
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123 int retval;
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124
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125 WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc);
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126 if ( WIN_timer ) {
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127 retval = 0;
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128 } else {
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129 retval = -1;
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130 }
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131 return retval;
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132 }
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133
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134 void SDL_SYS_StopTimer(void)
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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135 {
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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136 if ( WIN_timer ) {
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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137 KillTimer(NULL, WIN_timer);
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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138 WIN_timer = 0;
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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139 }
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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140 }
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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141