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annotate src/timer/wince/SDL_systimer.c @ 5267:b530ef003506

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Happy 2011! :)
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Feb 2011 22:37:15 -0800
parents 481dabb098ef
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b530ef003506 Happy 2011! :)
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3 Copyright (C) 1997-2011 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 #ifdef SDL_TIMER_WINCE
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25
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327f181542f1 Include windows.h in a single point in the source, so we can be consistent about the definition of UNICODE and have core utility functions for Windows that all modules can share.
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26 #include "../../core/windows/SDL_windows.h"
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27
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28 #include "SDL_timer.h"
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29
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30 static Uint64 start_date;
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31 static Uint64 start_ticks;
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32
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33 static Uint64
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34 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
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40 wce_date(void)
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41 {
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42 union
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43 {
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44 FILETIME ftime;
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45 Uint64 itime;
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46 } ftime;
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47 SYSTEMTIME stime;
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48
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49 GetSystemTime(&stime);
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50 SystemTimeToFileTime(&stime, &ftime.ftime);
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51 ftime.itime /= 10000; // Convert 100ns intervals to 1ms intervals
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52 // Remove ms portion, which can't be relied on
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53 ftime.itime -= (ftime.itime % 1000);
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54 return (ftime.itime);
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55 }
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56
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57 static Sint32
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58 wce_rel_ticks(void)
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59 {
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60 return ((Sint32) (wce_ticks() - start_ticks));
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61 }
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62
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63 static Sint32
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64 wce_rel_date(void)
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65 {
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66 return ((Sint32) (wce_date() - start_date));
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67 }
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68
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69 /* Recard start-time of application for reference */
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70 void
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71 SDL_StartTicks(void)
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72 {
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73 start_date = wce_date();
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74 start_ticks = wce_ticks();
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75 }
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76
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77 /* Return time in ms relative to when SDL was started */
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78 Uint32
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79 SDL_GetTicks()
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80 {
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81 Sint32 offset = wce_rel_date() - wce_rel_ticks();
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82 if ((offset < -1000) || (offset > 1000)) {
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83 // fprintf(stderr,"Time desync(%+d), resyncing\n",offset/1000);
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84 start_ticks -= offset;
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85 }
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86
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87 return ((Uint32) wce_rel_ticks());
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88 }
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89
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90 /* Give up approx. givem milliseconds to the OS. */
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91 void
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92 SDL_Delay(Uint32 ms)
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93 {
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94 Sleep(ms);
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95 }
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96
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97 #endif /* SDL_TIMER_WINCE */
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98
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99 /* vi: set ts=4 sw=4 expandtab: */