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annotate src/timer/windows/SDL_systimer.c @ 5282:8e421890cdb8

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Fixed bug #1117 There's a new event that's always sent when the window changes size, and that event is what the renderers listen for to determine if they need to rebind their context.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2011 19:02:14 -0800
parents b530ef003506
children
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1 /*
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2 SDL - Simple DirectMedia Layer
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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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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 #include "SDL_config.h"
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23
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24 #ifdef SDL_TIMER_WINDOWS
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25
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26 #include "../../core/windows/SDL_windows.h"
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27 #include <mmsystem.h>
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28
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29 #include "SDL_timer.h"
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30
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31 #ifdef _WIN32_WCE
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32 #error This is WinCE. Please use src/timer/wince/SDL_systimer.c instead.
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33 #endif
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34
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35 #define TIME_WRAP_VALUE (~(DWORD)0)
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36
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37 /* The first (low-resolution) ticks value of the application */
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38 static DWORD start;
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39
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40 #ifndef USE_GETTICKCOUNT
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41 /* Store if a high-resolution performance counter exists on the system */
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42 static BOOL hires_timer_available;
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43 /* The first high-resolution ticks value of the application */
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44 static LARGE_INTEGER hires_start_ticks;
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45 /* The number of ticks per second of the high-resolution performance counter */
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46 static LARGE_INTEGER hires_ticks_per_second;
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47 #endif
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48
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49 void
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50 SDL_StartTicks(void)
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51 {
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52 /* Set first ticks value */
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53 #ifdef USE_GETTICKCOUNT
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54 start = GetTickCount();
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55 #else
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56 #if 0 /* Apparently there are problems with QPC on Win2K */
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57 if (QueryPerformanceFrequency(&hires_ticks_per_second) == TRUE) {
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58 hires_timer_available = TRUE;
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59 QueryPerformanceCounter(&hires_start_ticks);
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60 } else
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61 #endif
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62 {
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63 hires_timer_available = FALSE;
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64 timeBeginPeriod(1); /* use 1 ms timer precision */
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65 start = timeGetTime();
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66 }
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67 #endif
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68 }
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69
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70 Uint32
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71 SDL_GetTicks(void)
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72 {
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73 DWORD now, ticks;
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74 #ifndef USE_GETTICKCOUNT
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75 LARGE_INTEGER hires_now;
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76 #endif
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77
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78 #ifdef USE_GETTICKCOUNT
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79 now = GetTickCount();
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80 #else
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81 if (hires_timer_available) {
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82 QueryPerformanceCounter(&hires_now);
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83
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84 hires_now.QuadPart -= hires_start_ticks.QuadPart;
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85 hires_now.QuadPart *= 1000;
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86 hires_now.QuadPart /= hires_ticks_per_second.QuadPart;
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87
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88 return (DWORD) hires_now.QuadPart;
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89 } else {
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90 now = timeGetTime();
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91 }
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92 #endif
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93
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94 if (now < start) {
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95 ticks = (TIME_WRAP_VALUE - start) + now;
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96 } else {
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97 ticks = (now - start);
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98 }
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99 return (ticks);
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100 }
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101
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102 void
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103 SDL_Delay(Uint32 ms)
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104 {
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105 Sleep(ms);
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106 }
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107
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108 #endif /* SDL_TIMER_WINDOWS */
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109
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110 /* vi: set ts=4 sw=4 expandtab: */