This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
testtimer.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
/* Test program to check the resolution of the SDL timer on the current
platform
*/
#include <stdlib.h>
#include <stdio.h>
#include "SDL.h"
#define DEFAULT_RESOLUTION 1
static int ticks = 0;
15
16
static Uint32 SDLCALL
ticktock(Uint32 interval)
18
19
++ticks;
return (interval);
20
21
}
22
23
static Uint32 SDLCALL
callback(Uint32 interval, void *param)
25
26
printf("Timer %d : param = %d\n", interval, (int) (uintptr_t) param);
return interval;
27
28
}
29
30
int
main(int argc, char *argv[])
32
int i, desired;
33
SDL_TimerID t1, t2, t3;
34
Uint64 start, now;
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
if (SDL_Init(SDL_INIT_TIMER) < 0) {
fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
return (1);
}
/* Start the timer */
desired = 0;
if (argv[1]) {
desired = atoi(argv[1]);
}
if (desired == 0) {
desired = DEFAULT_RESOLUTION;
}
SDL_SetTimer(desired, ticktock);
/* Wait 10 seconds */
printf("Waiting 10 seconds\n");
SDL_Delay(10 * 1000);
/* Stop the timer */
SDL_SetTimer(0, NULL);
/* Print the results */
if (ticks) {
fprintf(stderr,
"Timer resolution: desired = %d ms, actual = %f ms\n",
desired, (double) (10 * 1000) / ticks);
}
/* Test multiple timers */
printf("Testing multiple timers...\n");
t1 = SDL_AddTimer(100, callback, (void *) 1);
if (!t1)
fprintf(stderr, "Could not create timer 1: %s\n", SDL_GetError());
t2 = SDL_AddTimer(50, callback, (void *) 2);
if (!t2)
fprintf(stderr, "Could not create timer 2: %s\n", SDL_GetError());
t3 = SDL_AddTimer(233, callback, (void *) 3);
if (!t3)
fprintf(stderr, "Could not create timer 3: %s\n", SDL_GetError());
/* Wait 10 seconds */
printf("Waiting 10 seconds\n");
SDL_Delay(10 * 1000);
printf("Removing timer 1 and waiting 5 more seconds\n");
SDL_RemoveTimer(t1);
SDL_Delay(5 * 1000);
SDL_RemoveTimer(t2);
SDL_RemoveTimer(t3);
89
90
91
92
93
94
95
start = SDL_GetPerformanceCounter();
for (i = 0; i < 1000000; ++i) {
ticktock(0);
}
now = SDL_GetPerformanceCounter();
printf("1 million iterations of ticktock took %f ms\n", (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
96
97
SDL_Quit();
return (0);
99
100
/* vi: set ts=4 sw=4 expandtab: */