FPS.hx

package openfl.display;

import haxe.Timer;
import openfl.events.Event;
import openfl.text.TextField;
import openfl.text.TextFormat;
import flixel.math.FlxMath;
#if gl_stats
import openfl.display._internal.stats.Context3DStats;
import openfl.display._internal.stats.DrawCallContext;
#end
#if flash
import openfl.Lib;
#end

#if openfl
import openfl.system.System;
#end

/**
	The FPS class provides an easy-to-use monitor to display
	the current frame rate of an OpenFL project
**/
#if !openfl_debug
@:fileXml('tags="haxe,release"')
@:noDebug
#end
class FPS extends TextField
{
	/**
		The current frame rate, expressed using frames-per-second
	**/
	public var currentFPS(default, null):Int;
	private var memoryMegasPeak:Float = 0;

	@:noCompletion private var cacheCount:Int;
	@:noCompletion private var currentTime:Float;
	@:noCompletion private var times:Array<Float>;

	public function new(x:Float = 10, y:Float = 10, color:Int = 0x000000)
	{
		super();

		this.x = x;
		this.y = y;

		currentFPS = 144;
		selectable = false;
		mouseEnabled = true;
		defaultTextFormat =  new TextFormat (Paths.font("vcr.ttf"), 13, color); //this is how to change you're fonts, piss babies
		autoSize = LEFT;
		multiline = true;
		text = "FPS: ";

		cacheCount = 0;
		currentTime = 0;
		times = [];

		#if flash
		addEventListener(Event.ENTER_FRAME, function(e)
		{
			var time = Lib.getTimer();
			__enterFrame(time - currentTime);
		});
		#end
	}

	// Event Handlers
	@:noCompletion
	private #if !flash override #end function __enterFrame(deltaTime:Float):Void
	{
		currentTime += deltaTime;
		times.push(currentTime);

		while (times[0] < currentTime - 1000)
		{
			times.shift();
		}

		var currentCount = times.length;
		currentFPS = Math.round((currentCount + cacheCount) / 2);
		if (currentFPS > ClientPrefs.framerate) currentFPS = ClientPrefs.framerate;

		if (currentCount != cacheCount /*&& visible*/)
		{
			text = "FPS: " + currentFPS;
			var memoryMegas:Float = 0;
			
			#if openfl
			memoryMegas = Math.abs(FlxMath.roundDecimal(System.totalMemory / 1000000, 1));
			
			if (memoryMegas > memoryMegasPeak) memoryMegasPeak = memoryMegas;

			if (ClientPrefs.showMEM) text += "\nMEM: " + memoryMegas + " RAM" + "\nMEM PEAK: " + memoryMegasPeak + " RAM";
			#end

			textColor = 0xFF9C9C9C;
			if (memoryMegas > 3000 || currentFPS <= ClientPrefs.framerate / 2)
			{
				textColor = 0xFFFF0037;
			}

			#if (gl_stats && !disable_cffi && (!html5 || !canvas))
			text += "\ntotalDC: " + Context3DStats.totalDrawCalls();
			text += "\nstageDC: " + Context3DStats.contextDrawCalls(DrawCallContext.STAGE);
			text += "\nstage3DDC: " + Context3DStats.contextDrawCalls(DrawCallContext.STAGE3D);
			#end

			text += "\n";
		}

		cacheCount = currentCount;
	}
}