using UnityEngine;

public class RippleImageEffect : MonoBehaviour
{
	public enum Quality
	{
		High = 2,
		Medium = 3,
		Low = 4,
		VeryLow = 6
	}

	public Quality quality = Quality.High;

	[Range(0f, 4f)]
	public float intensity = 2.5f;

	[Range(0f, 0.09f)]
	public float damping;

	[Range(0.5f, 2f)]
	public float size = 1f;

	private Material mtrl;

	private RenderTexture bufferA;

	private RenderTexture bufferACache;

	private RenderTexture bufferB;

	private RenderTexture bufferBCache;

	private int frameCount;

	private void Awake()
	{
		mtrl = new Material(Shader.Find("Hidden/RippleImageEffect"));
	}

	private void OnRenderImage(RenderTexture src, RenderTexture dest)
	{
		if (mtrl == null || mtrl.shader == null || !mtrl.shader.isSupported)
		{
			base.enabled = false;
			return;
		}
		int num = (int)quality;
		int num2 = Screen.width / num;
		int num3 = Screen.height / num;
		if (bufferA == null || bufferA.width != num2 || bufferA.height != num3)
		{
			DestroyBufferA();
			bufferA = new RenderTexture(num2, num3, 0, RenderTextureFormat.Default);
		}
		if (bufferACache == null || bufferACache.width != num2 || bufferACache.height != num3)
		{
			DestroyBufferACache();
			bufferACache = new RenderTexture(num2, num3, 0, RenderTextureFormat.Default);
		}
		if (bufferB == null || bufferB.width != num2 || bufferB.height != num3)
		{
			DestroyBufferA();
			bufferB = new RenderTexture(num2, num3, 0, RenderTextureFormat.Default);
		}
		if (bufferBCache == null || bufferBCache.width != num2 || bufferBCache.height != num3)
		{
			bufferBCache = new RenderTexture(num2, num3, 0, RenderTextureFormat.Default);
		}
		if (bufferA == null || bufferB == null || bufferACache == null || bufferBCache == null)
		{
			Graphics.Blit(src, dest);
			return;
		}
		Vector4 zero = Vector4.zero;
		zero.z = (Input.GetMouseButton(0) ? 1 : 0);
		zero.x = Input.mousePosition.x;
		zero.y = Input.mousePosition.y;
		zero.w = frameCount;
		mtrl.SetVector("mouseData", zero);
		mtrl.SetFloat("intensity", intensity);
		mtrl.SetFloat("damping", damping);
		mtrl.SetFloat("size", size);
		mtrl.SetTexture("bufferA", bufferA);
		mtrl.SetTexture("bufferB", bufferB);
		Graphics.Blit(src, bufferACache, mtrl, 0);
		Graphics.Blit(bufferACache, bufferA);
		mtrl.SetTexture("bufferA", bufferB);
		mtrl.SetTexture("bufferB", bufferA);
		Graphics.Blit(src, bufferBCache, mtrl, 0);
		Graphics.Blit(bufferBCache, bufferB);
		mtrl.SetTexture("bufferA", bufferA);
		mtrl.SetTexture("bufferB", bufferB);
		Graphics.Blit(src, dest, mtrl, 1);
		frameCount++;
	}

	private void OnDestroy()
	{
		if (mtrl != null)
		{
			Object.Destroy(mtrl);
			mtrl = null;
		}
		DestroyBufferA();
		DestroyBufferB();
		DestroyBufferACache();
		DestroyBufferBCache();
	}

	private void DestroyBufferA()
	{
		if (bufferA != null)
		{
			Object.Destroy(bufferA);
			bufferA = null;
		}
	}

	private void DestroyBufferACache()
	{
		if (bufferACache != null)
		{
			Object.Destroy(bufferACache);
			bufferACache = null;
		}
	}

	private void DestroyBufferB()
	{
		if (bufferB != null)
		{
			Object.Destroy(bufferB);
			bufferB = null;
		}
	}

	private void DestroyBufferBCache()
	{
		if (bufferBCache != null)
		{
			Object.Destroy(bufferBCache);
			bufferBCache = null;
		}
	}
}