kc3-lang/SDL/Xcode-iOS/Demos/src/common.c

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• Hash : 1bd4b7fd
  Author :
  Date : 2020-11-06T13:03:07
  

  Updated iOS tests and demos for latest SDL linking requirements
  

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• Xcode-iOS/Demos/src/common.c

• /*
   *  common.c
   *  written by Holmes Futrell
   *  use however you want
   */
  
  #include "common.h"
  #include "SDL.h"
  #include <stdlib.h>
  
  /*
      Produces a random int x, min <= x <= max
      following a uniform distribution
  */
  int
  randomInt(int min, int max)
  {
      return min + rand() % (max - min + 1);
  }
  
  /*
      Produces a random float x, min <= x <= max
      following a uniform distribution
   */
  float
  randomFloat(float min, float max)
  {
      return rand() / (float) RAND_MAX *(max - min) + min;
  }
  
  void
  fatalError(const char *string)
  {
      printf("%s: %s\n", string, SDL_GetError());
      SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, string, SDL_GetError(), NULL);
      exit(1);
  }
  
  static Uint64 prevTime = 0;
  
  double
  updateDeltaTime(void)
  {
      Uint64 curTime;
      double deltaTime;
  
      if (prevTime == 0) {
          prevTime = SDL_GetPerformanceCounter();
      }
  
      curTime = SDL_GetPerformanceCounter();
      deltaTime = (double) (curTime - prevTime) / (double) SDL_GetPerformanceFrequency();
      prevTime = curTime;
  
      return deltaTime;
  }
  

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