Mercurial > sdl-ios-xcode

annotate src/timer/wince/SDL_systimer.c @ 1304:0175d3eeae89

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XFree86 directory renamed to Xext
author Sam Lantinga <slouken@libsdl.org>
date Tue, 31 Jan 2006 17:56:44 +0000
parents bdcb8bb4c831
children c9b51268668f
rev   line source
1180
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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@libsdl.org
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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 <windows.h>
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29 #include <mmsystem.h>
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30
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31 #include "SDL_timer.h"
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32 #include "SDL_timer_c.h"
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33 #include "SDL_error.h"
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34
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35 static Uint64 start_date;
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36 static Uint64 start_ticks;
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37
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38 static Uint64 wce_ticks(void)
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39 {
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40 return((Uint64)GetTickCount());
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41 }
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42
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43 static Uint64 wce_date(void)
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44 {
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45 union
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46 {
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47 FILETIME ftime;
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48 Uint64 itime;
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49 } ftime;
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50 SYSTEMTIME stime;
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51
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52 GetSystemTime(&stime);
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53 SystemTimeToFileTime(&stime,&ftime.ftime);
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54 ftime.itime/=10000; // Convert 100ns intervals to 1ms intervals
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55 // Remove ms portion, which can't be relied on
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56 ftime.itime -= (ftime.itime % 1000);
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57 return(ftime.itime);
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58 }
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59
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60 static Sint32 wce_rel_ticks(void)
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61 {
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62 return((Sint32)(wce_ticks()-start_ticks));
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63 }
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64
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65 static Sint32 wce_rel_date(void)
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66 {
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67 return((Sint32)(wce_date()-start_date));
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68 }
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69
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70 /* Return time in ms relative to when SDL was started */
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71 Uint32 SDL_GetTicks()
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72 {
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73 Sint32 offset=wce_rel_date()-wce_rel_ticks();
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74 if((offset < -1000) || (offset > 1000))
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75 {
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76 // fprintf(stderr,"Time desync(%+d), resyncing\n",offset/1000);
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77 start_ticks-=offset;
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78 }
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79
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80 return((Uint32)wce_rel_ticks());
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81 }
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82
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83 /* Give up approx. givem milliseconds to the OS. */
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84 void SDL_Delay(Uint32 ms)
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85 {
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86 Sleep(ms);
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87 }
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88
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89 /* Recard start-time of application for reference */
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90 void SDL_StartTicks(void)
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91 {
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92 start_date=wce_date();
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93 start_ticks=wce_ticks();
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94 }
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95
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96 static UINT WIN_timer;
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97
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98 int SDL_SYS_TimerInit(void)
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99 {
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100 return(0);
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101 }
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102
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103 void SDL_SYS_TimerQuit(void)
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104 {
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105 return;
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106 }
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107
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108 /* Forward declaration because this is called by the timer callback */
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109 int SDL_SYS_StartTimer(void);
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110
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111 static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime)
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112 {
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113 Uint32 ms;
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114
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115 ms = SDL_alarm_callback(SDL_alarm_interval);
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116 if ( ms != SDL_alarm_interval ) {
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117 KillTimer(NULL, idEvent);
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118 if ( ms ) {
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119 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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120 SDL_SYS_StartTimer();
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121 } else {
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122 SDL_alarm_interval = 0;
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123 }
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124 }
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125 }
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126
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127 int SDL_SYS_StartTimer(void)
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128 {
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129 int retval;
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130
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131 WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc);
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132 if ( WIN_timer ) {
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133 retval = 0;
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134 } else {
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135 retval = -1;
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136 }
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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137 return retval;
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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138 }
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 void SDL_SYS_StopTimer(void)
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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141 {
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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142 if ( WIN_timer ) {
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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143 KillTimer(NULL, WIN_timer);
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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144 WIN_timer = 0;
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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145 }
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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146 }
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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147