2 Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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.
8 Permission is granted to anyone to use this software for any purpose,
9 including commercial applications, and to alter it and redistribute it
13 /* Test program to check the resolution of the SDL timer on the current
22 #define DEFAULT_RESOLUTION 1
27 ticktock(Uint32 interval, void *param)
34 callback(Uint32 interval, void *param)
36 SDL_Log("Timer %d : param = %d\n", interval, (int) (uintptr_t) param);
40 main(int argc, char *argv[])
43 SDL_TimerID t1, t2, t3;
44 Uint32 start32, now32;
47 /* Enable standard application logging */
48 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
50 if (SDL_Init(SDL_INIT_TIMER) < 0) {
51 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
58 desired = atoi(argv[1]);
61 desired = DEFAULT_RESOLUTION;
63 t1 = SDL_AddTimer(desired, ticktock, NULL);
66 SDL_Log("Waiting 10 seconds\n");
72 /* Print the results */
74 SDL_Log("Timer resolution: desired = %d ms, actual = %f ms\n",
75 desired, (double) (10 * 1000) / ticks);
78 /* Test multiple timers */
79 SDL_Log("Testing multiple timers...\n");
80 t1 = SDL_AddTimer(100, callback, (void *) 1);
82 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 1: %s\n", SDL_GetError());
83 t2 = SDL_AddTimer(50, callback, (void *) 2);
85 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 2: %s\n", SDL_GetError());
86 t3 = SDL_AddTimer(233, callback, (void *) 3);
88 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 3: %s\n", SDL_GetError());
91 SDL_Log("Waiting 10 seconds\n");
94 SDL_Log("Removing timer 1 and waiting 5 more seconds\n");
102 start = SDL_GetPerformanceCounter();
103 for (i = 0; i < 1000000; ++i) {
106 now = SDL_GetPerformanceCounter();
107 SDL_Log("1 million iterations of ticktock took %f ms\n", (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
109 SDL_Log("Performance counter frequency: %"SDL_PRIu64"\n", SDL_GetPerformanceFrequency());
110 start32 = SDL_GetTicks();
111 start = SDL_GetPerformanceCounter();
113 now = SDL_GetPerformanceCounter();
114 now32 = SDL_GetTicks();
115 SDL_Log("Delay 1 second = %d ms in ticks, %f ms according to performance counter\n", (now32-start32), (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
121 /* vi: set ts=4 sw=4 expandtab: */