Counting Frames Per Second

Windows XP is the best OS to microsoft for OpenGL, this OS have much better performans in OpenGL that others (win98 is too bad for OpenGL). i find a code for frame counter, its working fine.

void CalculateFrameRate()
{
// Below we create a bunch of static variables because we want to keep the information
// in these variables after the function quits. We could make these global but that would
// be somewhat messy and superfluous. Note, that normally you don''t want to display this to
// the window title bar. This is because it''s slow and doesn''t work in full screen.
// Try using the 3D/2D font''s. You can check out the tutorials at www.gametutorials.com.

static float framesPerSecond = 0.0f; // This will store our fps
static float lastTime = 0.0f; // This will hold the time from the last frame
static char strFrameRate[50] = {0}; // We will store the string here for the window title

// Here we get the current tick count and multiply it by 0.001 to convert it from milliseconds to seconds.
// GetTickCount() returns milliseconds (1000 ms = 1 second) so we want something more intuitive to work with.
float currentTime = GetTickCount() * 0.001f;

// Increase the frame counter
++framesPerSecond;
// char pe[33];

// Now we want to subtract the current time by the last time that was stored. If it is greater than 1
// that means a second has passed and we need to display the new frame rate. Of course, the first time
// will always be greater than 1 because lastTime = 0. The first second will NOT be true, but the remaining
// ones will. The 1.0 represents 1 second. Let''s say we got 12031 (12.031) from GetTickCount for the currentTime,
// and the lastTime had 11230 (11.230). Well, 12.031 - 11.230 = 0.801, which is NOT a full second. So we try again
// the next frame. Once the currentTime - lastTime comes out to be greater than a second (> 1), we calculate the
// frames for this last second.
if( currentTime - lastTime > 1.0f )
{
// Here we set the lastTime to the currentTime. This will be used as the starting point for the next second.
// This is because GetTickCount() counts up, so we need to create a delta that subtract the current time from.
lastTime = currentTime;

// Copy the frames per second into a string to display in the window title bar
// sprintf(strFrameRate, "Return Fire Fps: %d", int(framesPerSecond));

char pi[33];

// Set the window title bar to our string
SetWindowText(hWnd, strFrameRate);

// Reset the frames per second
framesPerSecond = 0;
}
}

hope this help

Well, I''ve learn this from the last few forum...
You might want to use TimeGetTime() -> from ???
or
clock() in time.h
in place of GetTickCount() because it is more accurate...

I didn''t look at WinXP the same way as Visualc does, though. My WinXP simply slow things down, compared to Win2000. (Or maybe my PIII 450 is just slow for everything nowadays )