sdl

FORK: Simple Directmedia Layer
git clone https://git.neptards.moe/neptards/sdl.git
Log | Files | Refs

common.c (1042B)

      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 */
     15 int
     16 randomInt(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  */
     25 float
     26 randomFloat(float min, float max)
     27 {
     28     return rand() / (float) RAND_MAX *(max - min) + min;
     29 }
     30 
     31 void
     32 fatalError(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 
     39 static Uint64 prevTime = 0;
     40 
     41 double
     42 updateDeltaTime(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 }