Mercurial > love-experiments
annotate src/modules/timer/sdl/Timer.cpp @ 1282:b7f097053d74
Updated copyright text for the new year
| author | Alex Szpakowski <slime73@gmail.com> |
|---|---|
| date | Tue, 05 Feb 2013 05:32:49 -0400 |
| parents | 86a44f2bc38f |
| children | 0cef18e9d722 |
| rev | line source |
|---|---|
| 1096 | 1 /** |
|
1282
b7f097053d74
Updated copyright text for the new year
Alex Szpakowski <slime73@gmail.com>
parents:
1096
diff
changeset
|
2 * Copyright (c) 2006-2013 LOVE Development Team |
| 1096 | 3 * |
| 4 * This software is provided 'as-is', without any express or implied | |
| 5 * warranty. In no event will the authors be held liable for any damages | |
| 6 * arising from the use of this software. | |
| 7 * | |
| 8 * Permission is granted to anyone to use this software for any purpose, | |
| 9 * including commercial applications, and to alter it and redistribute it | |
| 10 * freely, subject to the following restrictions: | |
| 11 * | |
| 12 * 1. The origin of this software must not be misrepresented; you must not | |
| 13 * claim that you wrote the original software. If you use this software | |
| 14 * in a product, an acknowledgment in the product documentation would be | |
| 15 * appreciated but is not required. | |
| 16 * 2. Altered source versions must be plainly marked as such, and must not be | |
| 17 * misrepresented as being the original software. | |
| 18 * 3. This notice may not be removed or altered from any source distribution. | |
| 19 **/ | |
| 20 | |
| 21 #include "common/config.h" | |
| 22 #include "common/delay.h" | |
| 23 | |
| 24 #ifdef LOVE_WINDOWS | |
| 25 # include <windows.h> | |
| 26 # include <time.h> | |
| 27 #else | |
| 28 # include <sys/time.h> | |
| 29 #endif | |
| 30 | |
| 31 #include "Timer.h" | |
| 32 | |
| 33 namespace love | |
| 34 { | |
| 35 namespace timer | |
| 36 { | |
| 37 namespace sdl | |
| 38 { | |
| 39 | |
| 40 Timer::Timer() | |
| 41 : currTime(0) | |
| 42 , prevFpsUpdate(0) | |
| 43 , fps(0) | |
| 44 , fpsUpdateFrequency(1) | |
| 45 , frames(0) | |
| 46 , dt(0) | |
| 47 { | |
| 48 // Init the SDL timer system. | |
| 49 if (SDL_InitSubSystem(SDL_INIT_TIMER) < 0) | |
| 50 throw Exception(SDL_GetError()); | |
| 51 } | |
| 52 | |
| 53 Timer::~Timer() | |
| 54 { | |
| 55 // Quit SDL timer. | |
| 56 SDL_QuitSubSystem(SDL_INIT_TIMER); | |
| 57 } | |
| 58 | |
| 59 const char *Timer::getName() const | |
| 60 { | |
| 61 return "love.timer.sdl"; | |
| 62 } | |
| 63 | |
| 64 void Timer::step() | |
| 65 { | |
| 66 // Frames rendered | |
| 67 frames++; | |
| 68 | |
| 69 // "Current" time is previous time by now. | |
| 70 prevTime = currTime; | |
| 71 | |
| 72 // Get ticks from SDL | |
| 73 currTime = SDL_GetTicks(); | |
| 74 | |
| 75 // Convert to number of seconds | |
| 76 dt = (currTime - prevTime)/1000.0; | |
| 77 | |
| 78 double timeSinceLast = (currTime - prevFpsUpdate)/1000.0; | |
| 79 // Update FPS? | |
| 80 if (timeSinceLast > fpsUpdateFrequency) | |
| 81 { | |
| 82 fps = int((frames/timeSinceLast) + 0.5); | |
| 83 prevFpsUpdate = currTime; | |
| 84 frames = 0; | |
| 85 } | |
| 86 } | |
| 87 | |
| 88 void Timer::sleep(double seconds) | |
| 89 { | |
| 90 if (seconds > 0) | |
| 91 delay((int)(seconds*1000)); | |
| 92 } | |
| 93 | |
| 94 double Timer::getDelta() const | |
| 95 { | |
| 96 return dt; | |
| 97 } | |
| 98 | |
| 99 int Timer::getFPS() const | |
| 100 { | |
| 101 return fps; | |
| 102 } | |
| 103 | |
| 104 double Timer::getTime() const | |
| 105 { | |
| 106 return SDL_GetTicks()/1000.0; | |
| 107 } | |
| 108 | |
| 109 double Timer::getMicroTime() const | |
| 110 { | |
| 111 #ifdef LOVE_WINDOWS | |
| 112 static __int64 freq = 0; | |
| 113 | |
| 114 if (!freq) | |
| 115 { | |
| 116 LARGE_INTEGER temp; | |
| 117 QueryPerformanceFrequency(&temp); | |
| 118 | |
| 119 freq = (__int64) temp.QuadPart; | |
| 120 } | |
| 121 | |
| 122 LARGE_INTEGER microTime; | |
| 123 QueryPerformanceCounter(µTime); | |
| 124 | |
| 125 // The 64 to 32 bit integer conversion, assuming the fraction part down | |
| 126 // to microseconds takes 20 bits, should not be a problem unless the | |
| 127 // system has an uptime of a few decades. | |
| 128 return (double) microTime.QuadPart / (double) freq; | |
| 129 #else | |
| 130 timeval t; | |
| 131 gettimeofday(&t, NULL); | |
| 132 return t.tv_sec + t.tv_usec/1000000.0; | |
| 133 #endif | |
| 134 } | |
| 135 | |
| 136 } // sdl | |
| 137 } // timer | |
| 138 } // love |