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122 lines
3.4 KiB
C
122 lines
3.4 KiB
C
/*
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Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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/* Test program to check the resolution of the SDL timer on the current
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platform
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "SDL.h"
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#define DEFAULT_RESOLUTION 1
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static int ticks = 0;
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static Uint32 SDLCALL
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ticktock(Uint32 interval, void *param)
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{
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++ticks;
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return (interval);
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}
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static Uint32 SDLCALL
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callback(Uint32 interval, void *param)
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{
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SDL_Log("Timer %d : param = %d\n", interval, (int) (uintptr_t) param);
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return interval;
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}
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int
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main(int argc, char *argv[])
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{
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int i, desired;
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SDL_TimerID t1, t2, t3;
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Uint32 start32, now32;
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Uint64 start, now;
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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if (SDL_Init(SDL_INIT_TIMER) < 0) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
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return (1);
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}
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/* Start the timer */
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desired = 0;
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if (argv[1]) {
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desired = atoi(argv[1]);
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}
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if (desired == 0) {
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desired = DEFAULT_RESOLUTION;
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}
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t1 = SDL_AddTimer(desired, ticktock, NULL);
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/* Wait 10 seconds */
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SDL_Log("Waiting 10 seconds\n");
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SDL_Delay(10 * 1000);
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/* Stop the timer */
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SDL_RemoveTimer(t1);
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/* Print the results */
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if (ticks) {
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SDL_Log("Timer resolution: desired = %d ms, actual = %f ms\n",
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desired, (double) (10 * 1000) / ticks);
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}
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/* Test multiple timers */
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SDL_Log("Testing multiple timers...\n");
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t1 = SDL_AddTimer(100, callback, (void *) 1);
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if (!t1)
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 1: %s\n", SDL_GetError());
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t2 = SDL_AddTimer(50, callback, (void *) 2);
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if (!t2)
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 2: %s\n", SDL_GetError());
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t3 = SDL_AddTimer(233, callback, (void *) 3);
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if (!t3)
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 3: %s\n", SDL_GetError());
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/* Wait 10 seconds */
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SDL_Log("Waiting 10 seconds\n");
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SDL_Delay(10 * 1000);
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SDL_Log("Removing timer 1 and waiting 5 more seconds\n");
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SDL_RemoveTimer(t1);
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SDL_Delay(5 * 1000);
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SDL_RemoveTimer(t2);
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SDL_RemoveTimer(t3);
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start = SDL_GetPerformanceCounter();
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for (i = 0; i < 1000000; ++i) {
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ticktock(0, NULL);
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}
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now = SDL_GetPerformanceCounter();
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SDL_Log("1 million iterations of ticktock took %f ms\n", (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
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SDL_Log("Performance counter frequency: %"SDL_PRIu64"\n", (unsigned long long) SDL_GetPerformanceFrequency());
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start32 = SDL_GetTicks();
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start = SDL_GetPerformanceCounter();
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SDL_Delay(1000);
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now = SDL_GetPerformanceCounter();
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now32 = SDL_GetTicks();
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SDL_Log("Delay 1 second = %d ms in ticks, %f ms according to performance counter\n", (now32-start32), (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
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SDL_Quit();
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return (0);
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}
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/* vi: set ts=4 sw=4 expandtab: */
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