www.pudn.com > Terrain.rar > fps.cpp

////////////////////////////////////////////////////////////////////////////////////////////////// 
//  
// File: fps.cpp 
//  
// Author: Frank Luna (C) All Rights Reserved 
// 
// System: AMD Athlon 1800+ XP, 512 DDR, Geforce 3, Windows XP, MSVC++ 7.0  
// 
// Desc: Wraps the code to compute and display the frames rendered per second. 
//           
////////////////////////////////////////////////////////////////////////////////////////////////// 
 
#include "fps.h" 
#include  
 
FPSCounter::FPSCounter(IDirect3DDevice9* device) 
{ 
	_device = device; 
 
	_font = new CD3DFont("Times New Roman", 24, 0); 
	_font->InitDeviceObjects( _device ); 
	_font->RestoreDeviceObjects(); 
 
	_frameCnt = 0; 
	_timeElapsed = 0.0f; 
	_fps         = 0.0f; 
} 
 
FPSCounter::~FPSCounter() 
{ 
	if( _font ) 
	{ 
		_font->InvalidateDeviceObjects(); 
		_font->DeleteDeviceObjects(); 
		delete _font; 
	} 
} 
 
bool FPSCounter::render(D3DCOLOR color, float timeDelta) 
{ 
	if( _font ) 
	{ 
		_frameCnt++; 
 
		_timeElapsed += timeDelta; 
 
		if(_timeElapsed >= 1.0f) 
		{ 
			_fps = (float)_frameCnt / _timeElapsed; 
 
			sprintf(_fpsString, "%f", _fps); 
			_fpsString[8] = '\0'; // mark end of string 
 
			_timeElapsed = 0.0f; 
			_frameCnt    = 0; 
		} 
 
		_font->DrawText(20, 20, color, _fpsString);	 
	} 
	return true; 
}