block fade

using UnityEngine;
using System.Collections;
using System;
using UnityEngine.SceneManagement;

public class SceneFadeInOut : MonoBehaviour
{

	public void StartSceneFadeOut()
	{
		fadeDir *= -1;
		startTime = 0;
	}




	public float fadeSpeed = 0.5f;
	public float[,] gridStartTime;
	// public float[,] gridFadeRate;
	public float[,] alphas;
	public Texture2D textur;
	public int fadeDir = -1;
	public float startTime = 0;

	public delegate void Derp();
	public Derp FinishedFade;
	public Derp FinishedUnFade;


	// float alpha = 1.0f;
	float size = 1.0f;
	int fullFadeCount = 0;
	// int drawDepth = 5;
	int wid, hei;

	// private bool sceneStarting = true;
	private int totalBlocks = 0;


	void Start()
	{
		size = Mathf.Min(Screen.width, Screen.height) / 10.0f;
		wid = Mathf.RoundToInt(Screen.width / size) + 1;
		hei = Mathf.RoundToInt(Screen.height / size) + 1;
		gridStartTime = new float[wid, hei];
		// gridFadeRate= new float[wid, hei];
		alphas = new float[wid, hei];
		for (int i = 0; i < wid; i++)
		{
			for (int j = 0; j < hei; j++)
			{
				gridStartTime[i, j] = UnityEngine.Random.Range(0.5f, 1.1f); // till start of fade
				alphas[i, j] = 1.0f;
				// gridFadeRate[i,j] =  // unused fade rate
			}
		}
		totalBlocks = hei * wid;
		// guiTexture.pixelInset = new Rect(0, 0, Screen.width, Screen.height);
	}

	private int errorcount = 0;
	void OnGUI()
	{
		if (gridStartTime == null)
		{
			if (errorcount == 0)
			{
				Debug.Log("Error In Scene Fader?");
				errorcount++;
			}
			return;
		}
		// no need for later? 
		if (startTime < 5)
		{
			startTime += Time.deltaTime;
			fullFadeCount = 0;
			for (int i = 0; i < wid; i++)
			{
				for (int j = 0; j < hei; j++)
				{
					// start fading?
					if (startTime > gridStartTime[i, j]) 
					{
						alphas[i, j] += fadeDir * fadeSpeed * Time.deltaTime;
						alphas[i, j] = Mathf.Clamp01(alphas[i, j]);
						if (alphas[i, j] == 1)
						{
							fullFadeCount++;
						}
						else if (alphas[i, j] == 0)
						{
							fullFadeCount--;
						}
					}
					GUI.color = new Color(GUI.color.r, GUI.color.g, GUI.color.b, alphas[i, j]);
					GUI.DrawTexture(new Rect(i * size, j * size, size, size), textur);
				}
			}
		}

		if (fullFadeCount == totalBlocks)
		{
			if (FinishedFade != null)
			{
				FinishedFade();
			}
		}
		else if (fullFadeCount == -totalBlocks)
		{
			if (FinishedUnFade != null)
			{
				FinishedUnFade();
			}
		}
	}
}