1 /*
2 Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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.
11 */
12
13 /* Test program to check the resolution of the SDL timer on the current
14 platform
15 */
16
17 #include <stdlib.h>
18 #include <stdio.h>
19
20 #include "SDL.h"
21
22 #define DEFAULT_RESOLUTION 1
23
24 static int ticks = 0;
25
26 static Uint32 SDLCALL
ticktock(Uint32 interval,void * param)27 ticktock(Uint32 interval, void *param)
28 {
29 ++ticks;
30 return (interval);
31 }
32
33 static Uint32 SDLCALL
callback(Uint32 interval,void * param)34 callback(Uint32 interval, void *param)
35 {
36 SDL_Log("Timer %d : param = %d\n", interval, (int) (uintptr_t) param);
37 return interval;
38 }
39
40 int
main(int argc,char * argv[])41 main(int argc, char *argv[])
42 {
43 int i, desired;
44 SDL_TimerID t1, t2, t3;
45 Uint32 start32, now32;
46 Uint64 start, now;
47
48 /* Enable standard application logging */
49 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
50
51 if (SDL_Init(SDL_INIT_TIMER) < 0) {
52 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
53 return (1);
54 }
55
56 /* Start the timer */
57 desired = 0;
58 if (argv[1]) {
59 desired = atoi(argv[1]);
60 }
61 if (desired == 0) {
62 desired = DEFAULT_RESOLUTION;
63 }
64 t1 = SDL_AddTimer(desired, ticktock, NULL);
65
66 /* Wait 10 seconds */
67 SDL_Log("Waiting 10 seconds\n");
68 SDL_Delay(10 * 1000);
69
70 /* Stop the timer */
71 SDL_RemoveTimer(t1);
72
73 /* Print the results */
74 if (ticks) {
75 SDL_Log("Timer resolution: desired = %d ms, actual = %f ms\n",
76 desired, (double) (10 * 1000) / ticks);
77 }
78
79 /* Test multiple timers */
80 SDL_Log("Testing multiple timers...\n");
81 t1 = SDL_AddTimer(100, callback, (void *) 1);
82 if (!t1)
83 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 1: %s\n", SDL_GetError());
84 t2 = SDL_AddTimer(50, callback, (void *) 2);
85 if (!t2)
86 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 2: %s\n", SDL_GetError());
87 t3 = SDL_AddTimer(233, callback, (void *) 3);
88 if (!t3)
89 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 3: %s\n", SDL_GetError());
90
91 /* Wait 10 seconds */
92 SDL_Log("Waiting 10 seconds\n");
93 SDL_Delay(10 * 1000);
94
95 SDL_Log("Removing timer 1 and waiting 5 more seconds\n");
96 SDL_RemoveTimer(t1);
97
98 SDL_Delay(5 * 1000);
99
100 SDL_RemoveTimer(t2);
101 SDL_RemoveTimer(t3);
102
103 start = SDL_GetPerformanceCounter();
104 for (i = 0; i < 1000000; ++i) {
105 ticktock(0, NULL);
106 }
107 now = SDL_GetPerformanceCounter();
108 SDL_Log("1 million iterations of ticktock took %f ms\n", (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
109
110 SDL_Log("Performance counter frequency: %"SDL_PRIu64"\n", SDL_GetPerformanceFrequency());
111 start32 = SDL_GetTicks();
112 start = SDL_GetPerformanceCounter();
113 SDL_Delay(1000);
114 now = SDL_GetPerformanceCounter();
115 now32 = SDL_GetTicks();
116 SDL_Log("Delay 1 second = %d ms in ticks, %f ms according to performance counter\n", (now32-start32), (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
117
118 SDL_Quit();
119 return (0);
120 }
121
122 /* vi: set ts=4 sw=4 expandtab: */
123