Sources/Classes/Application/Model/Utilities/Timer/PrefTimer.m
/* |
File: PrefTimer.m |
Abstract: |
Simple MACH-based performance timer utility toolkit. |
Version: 1.2 |
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*/ |
//--------------------------------------------------------------------------- |
//--------------------------------------------------------------------------- |
#import <mach/mach.h> |
#import <mach/mach_time.h> |
#import <unistd.h> |
//--------------------------------------------------------------------------- |
#import "PrefTimer.h" |
//--------------------------------------------------------------------------- |
//--------------------------------------------------------------------------- |
static const double kPrefTimerMachScaleFactor = 0.000000001; |
//--------------------------------------------------------------------------- |
//--------------------------------------------------------------------------- |
struct PrefTimerData |
{ |
double mnTimeBase; |
double mnMarkTime; |
double mnFPS; |
long mnCounter; |
}; |
typedef struct PrefTimerData PrefTimerData; |
//--------------------------------------------------------------------------- |
//--------------------------------------------------------------------------- |
@implementation PrefTimer |
//--------------------------------------------------------------------------- |
- (void) initTimeBaseInfo |
{ |
kern_return_t err = KERN_SUCCESS; |
mach_timebase_info_data_t timebaseInfo; |
timebaseInfo.numer = 0; |
timebaseInfo.denom = 0; |
err = mach_timebase_info(&timebaseInfo); |
// Check errors |
check(err == KERN_SUCCESS); |
if( err != KERN_SUCCESS ) |
{ |
NSLog( @">> ERROR[%d]: Pref Timer - Getting mach timebase info!", err ); |
} // if |
else |
{ |
double numer = (double)timebaseInfo.numer; |
double denom = (double)timebaseInfo.denom; |
mpPrefTimer->mnTimeBase = kPrefTimerMachScaleFactor * ( numer / denom ); |
} // else |
} // initTimeBaseInfo |
//--------------------------------------------------------------------------- |
- (id) init |
{ |
self = [super init]; |
if( self ) |
{ |
mpPrefTimer = (PrefTimerDataRef)calloc(1, sizeof(PrefTimerData)); |
if( mpPrefTimer != NULL ) |
{ |
[self initTimeBaseInfo]; |
} // if |
else |
{ |
NSLog( @">> ERROR: Pref Timer - Failure Allocating Memory For Attributes!" ); |
} // else |
} // if |
return( self ); |
} // init |
//--------------------------------------------------------------------------- |
+ (id) prefTimer |
{ |
return( [[[PrefTimer allocWithZone:[self zone]] init] autorelease] ); |
} // prefTimer |
//--------------------------------------------------------------------------- |
- (void) dealloc |
{ |
if( mpPrefTimer != NULL ) |
{ |
free( mpPrefTimer ); |
mpPrefTimer = NULL; |
} // if |
[super dealloc]; |
} // dealloc |
//--------------------------------------------------------------------------- |
- (double) machAbsoluteTime |
{ |
// Get Mach absolute time. |
double machTime = (double)mach_absolute_time(); |
// Convert to seconds. |
double machTimeSec = mpPrefTimer->mnTimeBase * machTime; |
return( machTimeSec ); |
} // machAbsoluteTime |
//--------------------------------------------------------------------------- |
- (double) perfTick |
{ |
double deltaTime = 0.0; |
double currentTime = 0.0; |
mpPrefTimer->mnCounter++; |
currentTime = [self machAbsoluteTime]; |
deltaTime = currentTime - mpPrefTimer->mnMarkTime; |
if( deltaTime > 1.0 ) |
{ |
mpPrefTimer->mnFPS = mpPrefTimer->mnCounter / deltaTime; |
mpPrefTimer->mnMarkTime = [self machAbsoluteTime]; |
mpPrefTimer->mnCounter = 0; |
} // if |
return( mpPrefTimer->mnFPS ); |
} // perfTick |
//--------------------------------------------------------------------------- |
@end |
//--------------------------------------------------------------------------- |
//--------------------------------------------------------------------------- |
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