[Source] Displayingg Framerate Per Second

//includes

#include <time.h>


//globals

float fFps = 0.0f;
float fLastTickCount = 0.0f;
float fCurrentTickCount;
char cFrameRate[50] = {0};



//Do the rest in EndScene

HRESULT APIENTRY IDirect3DDevice9::EndScene()
{

fCurrentTickCount = clock() * 0.001f;
++fFps;

if((fCurrentTickCount - fLastTickCount) > 1.0f)
{
fLastTickCount = fCurrentTickCount;
sprintf(cFrameRate, "[ FPS: %d ]", int(fFps));
fFps = 0;
}

return Device->EndScene();

}