Atlas - common.c
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[FILE BEGIN]
1/*
2 *  common.c
3 *  written by Holmes Futrell
4 *  use however you want
5 */
6
7#include "common.h"
8#include "SDL.h"
9#include <stdlib.h>
10
11/*
12    Produces a random int x, min <= x <= max
13    following a uniform distribution
14*/
15int
16randomInt(int min, int max)
17{
18    return min + rand() % (max - min + 1);
19}
20
21/*
22    Produces a random float x, min <= x <= max
23    following a uniform distribution
24 */
25float
26randomFloat(float min, float max)
27{
28    return rand() / (float) RAND_MAX *(max - min) + min;
29}
30
31void
32fatalError(const char *string)
33{
34    printf("%s: %s\n", string, SDL_GetError());
35    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, string, SDL_GetError(), NULL);
36    exit(1);
37}
38
39static Uint64 prevTime = 0;
40
41double
42updateDeltaTime(void)
43{
44    Uint64 curTime;
45    double deltaTime;
46
47    if (prevTime == 0) {
48        prevTime = SDL_GetPerformanceCounter();
49    }
50
51    curTime = SDL_GetPerformanceCounter();
52    deltaTime = (double) (curTime - prevTime) / (double) SDL_GetPerformanceFrequency();
53    prevTime = curTime;
54
55    return deltaTime;
56}
57
[FILE END]
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