Mercurial > sdl-ios-xcode

annotate src/timer/wince/SDL_systimer.c @ 1446:47bf1767c4ca

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Date: Mon, 27 Feb 2006 02:17:29 +0100 From: "William Petiot [exoide]" Subject: Re: [SDL] cvs version: questions regarding HAVE_STDIO_H in standard w I managed to get a first implementation of it, which I tested for "simple" use with tests sample apps, they work ok. I think this needs more tests. Here is the diff against CVS/SDL12, attached.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 27 Feb 2006 03:48:48 +0000
parents bb6839704ed6
children 420b3f47806d
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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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #define WIN32_LEAN_AND_MEAN
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25 #include <windows.h>
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26 #include <mmsystem.h>
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27
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28 #include "SDL_timer.h"
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29 #include "../SDL_timer_c.h"
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30
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31 static Uint64 start_date;
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32 static Uint64 start_ticks;
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33
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34 static Uint64 wce_ticks(void)
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35 {
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36 return((Uint64)GetTickCount());
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37 }
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38
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39 static Uint64 wce_date(void)
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40 {
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41 union
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42 {
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43 FILETIME ftime;
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44 Uint64 itime;
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45 } ftime;
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46 SYSTEMTIME stime;
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47
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48 GetSystemTime(&stime);
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49 SystemTimeToFileTime(&stime,&ftime.ftime);
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50 ftime.itime/=10000; // Convert 100ns intervals to 1ms intervals
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51 // Remove ms portion, which can't be relied on
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52 ftime.itime -= (ftime.itime % 1000);
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53 return(ftime.itime);
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54 }
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55
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56 static Sint32 wce_rel_ticks(void)
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57 {
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58 return((Sint32)(wce_ticks()-start_ticks));
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59 }
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60
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61 static Sint32 wce_rel_date(void)
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62 {
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63 return((Sint32)(wce_date()-start_date));
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64 }
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65
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66 /* Return time in ms relative to when SDL was started */
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67 Uint32 SDL_GetTicks()
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68 {
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69 Sint32 offset=wce_rel_date()-wce_rel_ticks();
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70 if((offset < -1000) || (offset > 1000))
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71 {
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72 // fprintf(stderr,"Time desync(%+d), resyncing\n",offset/1000);
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73 start_ticks-=offset;
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74 }
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75
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76 return((Uint32)wce_rel_ticks());
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77 }
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78
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79 /* Give up approx. givem milliseconds to the OS. */
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80 void SDL_Delay(Uint32 ms)
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81 {
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82 Sleep(ms);
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83 }
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84
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85 /* Recard start-time of application for reference */
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86 void SDL_StartTicks(void)
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87 {
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88 start_date=wce_date();
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89 start_ticks=wce_ticks();
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90 }
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91
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92 static UINT WIN_timer;
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93
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94 int SDL_SYS_TimerInit(void)
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95 {
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96 return(0);
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97 }
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98
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99 void SDL_SYS_TimerQuit(void)
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100 {
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101 return;
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102 }
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103
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104 /* Forward declaration because this is called by the timer callback */
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105 int SDL_SYS_StartTimer(void);
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106
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107 static VOID CALLBACK TimerCallbackProc(HWND hwnd, UINT uMsg, UINT idEvent, DWORD dwTime)
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108 {
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109 Uint32 ms;
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110
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111 ms = SDL_alarm_callback(SDL_alarm_interval);
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112 if ( ms != SDL_alarm_interval ) {
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113 KillTimer(NULL, idEvent);
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114 if ( ms ) {
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115 SDL_alarm_interval = ROUND_RESOLUTION(ms);
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116 SDL_SYS_StartTimer();
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117 } else {
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118 SDL_alarm_interval = 0;
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119 }
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120 }
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121 }
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122
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123 int SDL_SYS_StartTimer(void)
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124 {
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125 int retval;
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126
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127 WIN_timer = SetTimer(NULL, 0, SDL_alarm_interval, TimerCallbackProc);
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128 if ( WIN_timer ) {
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129 retval = 0;
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130 } else {
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131 retval = -1;
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132 }
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133 return retval;
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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134 }
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
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135
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
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136 void SDL_SYS_StopTimer(void)
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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137 {
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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138 if ( WIN_timer ) {
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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139 KillTimer(NULL, WIN_timer);
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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140 WIN_timer = 0;
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 }
bdcb8bb4c831 From: Tyler Montbriand <tsm@accesscomm.ca>
Ryan C. Gordon <icculus@icculus.org>
parents:
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143