Function SCR_DrawFPS

neo/framework/Console.cpp:197–242

*/
#define	FPS_FRAMES	64
float SCR_DrawFPS( float y ) {
	static float previousTimes[FPS_FRAMES];
	static int	index;
	static double previous;

	// don't use serverTime, because that will be drifting to
	// correct for internet lag changes, timescales, timedemos, etc
	double t = Sys_MillisecondsPrecise();
	float frameTime = t - previous;
	previous = t;

	previousTimes[index % FPS_FRAMES] = frameTime;
	index++;
	if ( index > FPS_FRAMES ) {
		// average multiple frames together to smooth changes out a bit
		float total = 0.0f;
		float minTime = 10000;
		float maxTime = 0;
		for ( int i = 0 ; i < FPS_FRAMES ; i++ ) {
			float pt = previousTimes[i];
			total += pt;
			minTime = Min( minTime, pt );
			maxTime = Max( maxTime, pt );
		}
		if ( total == 0.0f ) {
			total = 0.1f;
		}
		float fps = (1000.0f * FPS_FRAMES) / total;

		char* s = va( "%.2ffps", fps );
		int w = strlen( s ) * BIGCHAR_WIDTH;

		renderSystem->DrawBigStringExt( 635 - w, idMath::FtoiFast( y ) + 2, s, colorWhite, true, localConsole.charSetShader);

		if ( com_showFPS.GetInteger() > 1 ) {
			y +=  BIGCHAR_HEIGHT + 4;

			s = va( "avg %.2fms min %.2f max %.2f", total * (1.0f / FPS_FRAMES), minTime, maxTime );
			w = strlen ( s ) * SMALLCHAR_WIDTH;
			renderSystem->DrawSmallStringExt( 635 - w, idMath::FtoiFast( y ) + 2, s, colorWhite, true, localConsole.charSetShader );
		}

	}

	return y + BIGCHAR_HEIGHT + 4;
}

/*
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