2016-05-18 05:53:35 +00:00
/*
2019-10-30 10:09:54 +00:00
Copyright ( C ) 1997 - 2018 Sam Lantinga < slouken @ libsdl . org >
2016-05-18 05:53:35 +00:00
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: % " SDL_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: */