PhysiX/timer.c at main · Fake-Face/PhysiX · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
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
#include "timer.h"

#ifdef _WIN32
#include <SDL.h>
#else
#include <SDL2/SDL.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

Timer* Timer_new()
{
    Timer* timer = NULL;

    timer = (Timer*)calloc(1, sizeof(Timer));
    if (!timer)
        return NULL;

    timer->m_startTime = -1.f;
    timer->m_currentTime = 0.f;
    timer->m_previousTime = timer->m_currentTime;
    timer->m_delta = 0.f;

    return timer;
}

void Timer_free(Timer* timer)
{
    if (!timer) return;

    memset(timer, 0, sizeof(Timer));
    free(timer);
}

void Timer_start(Timer* timer)
{
    if (!timer)
        return;

    timer->m_startTime = SDL_GetTicks() / 1000.f;
    timer->m_currentTime = 0.f;
    timer->m_previousTime = 0.f;
    timer->m_delta = 0.f;
}

void Timer_update(Timer* timer)
{
    timer->m_previousTime = timer->m_currentTime;
    timer->m_currentTime = SDL_GetTicks() / 1000.f - timer->m_startTime;
    timer->m_delta = timer->m_currentTime - timer->m_previousTime;
}

float Timer_getDelta(Timer *timer)
{
    return timer->m_delta;
}

float Timer_getElapsed(Timer *timer)
{
    return timer->m_currentTime - timer->m_startTime;
}