kc3-lang/SDL/test/testtimer.c

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• Hash : b88ca1b4
  Author :
  Date : 2015-02-10T16:28:56
  

  the last parameter of XChangeProperty is the number of elements.. and when the element format is 32.. the element is "long" so we have 5 long elements here. Yes this seems confusing as on mac+linux Long is either 32 or 64bits depending on the architecture, but this is how the X11 protocol is defined. Thus 5 is the correct value for the nelts here. Not 5 or 10 depending on the architecture. More info on the confusion https://bugs.freedesktop.org/show_bug.cgi?id=16802

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• test/testtimer.c

• /*
    Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely.
  */
  
  /* 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;
  
  static Uint32 SDLCALL
  ticktock(Uint32 interval, void *param)
  {
      ++ticks;
      return (interval);
  }
  
  static Uint32 SDLCALL
  callback(Uint32 interval, void *param)
  {
      SDL_Log("Timer %d : param = %d\n", interval, (int) (uintptr_t) param);
      return interval;
  }
  
  int
  main(int argc, char *argv[])
  {
      int i, desired;
      SDL_TimerID t1, t2, t3;
      Uint32 start32, now32;
      Uint64 start, now;
  
  	/* Enable standard application logging */
      SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
  
      if (SDL_Init(SDL_INIT_TIMER) < 0) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "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;
      }
      t1 = SDL_AddTimer(desired, ticktock, NULL);
  
      /* Wait 10 seconds */
      SDL_Log("Waiting 10 seconds\n");
      SDL_Delay(10 * 1000);
  
      /* Stop the timer */
      SDL_RemoveTimer(t1);
  
      /* Print the results */
      if (ticks) {
          SDL_Log("Timer resolution: desired = %d ms, actual = %f ms\n",
                  desired, (double) (10 * 1000) / ticks);
      }
  
      /* Test multiple timers */
      SDL_Log("Testing multiple timers...\n");
      t1 = SDL_AddTimer(100, callback, (void *) 1);
      if (!t1)
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 1: %s\n", SDL_GetError());
      t2 = SDL_AddTimer(50, callback, (void *) 2);
      if (!t2)
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 2: %s\n", SDL_GetError());
      t3 = SDL_AddTimer(233, callback, (void *) 3);
      if (!t3)
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION,"Could not create timer 3: %s\n", SDL_GetError());
  
      /* Wait 10 seconds */
      SDL_Log("Waiting 10 seconds\n");
      SDL_Delay(10 * 1000);
  
      SDL_Log("Removing timer 1 and waiting 5 more seconds\n");
      SDL_RemoveTimer(t1);
  
      SDL_Delay(5 * 1000);
  
      SDL_RemoveTimer(t2);
      SDL_RemoveTimer(t3);
  
      start = SDL_GetPerformanceCounter();
      for (i = 0; i < 1000000; ++i) {
          ticktock(0, NULL);
      }
      now = SDL_GetPerformanceCounter();
      SDL_Log("1 million iterations of ticktock took %f ms\n", (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
  
      SDL_Log("Performance counter frequency: %"PRIu64"\n", (unsigned long long) SDL_GetPerformanceFrequency());
      start32 = SDL_GetTicks();
      start = SDL_GetPerformanceCounter();
      SDL_Delay(1000);
      now = SDL_GetPerformanceCounter();
      now32 = SDL_GetTicks();
      SDL_Log("Delay 1 second = %d ms in ticks, %f ms according to performance counter\n", (now32-start32), (double)((now - start)*1000) / SDL_GetPerformanceFrequency());
  
      SDL_Quit();
      return (0);
  }
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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