p65rsvefi/DisassemblingComputer/Assets/Courses/DisaComputer/Plugin/FontBlur/FontBlur.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class FontBlur : MonoBehaviour {
	private Material m_material;//新生成的GameObject RawImage的材质
	public Shader m_shader;//需要替换的shader

	private GameObject m_RawImage;//使用此对象(类型为RawImage)去代替原有对象完成模糊特效
	private GameObject m_Canvas;
	private GameObject m_Camera;
	private RenderTexture m_RenderTexture;
	private float MipMapLeavel;//RT的MipMapLeavel
    //模糊采样范围
    public float CurBlurSpread = 16;

	public GameObject MainCanvas;
	public Texture2D WaveMap;
    //播放时间
    public float Delay = 2;
    //每秒的CurBlurSpread变化量
    private float DeltaPS;

	public Vector2 Tiling = new Vector2(0.25f, 0.25f);
	public Vector2 Offset = new Vector2(0.2f, 0.2f);

	//扰动幅度
	public float WaveFactor = 0.0003f;


	void Start () {
		BeginBlur();
	}

	//开始模糊
	public void BeginBlur () {
		m_RenderTexture = new RenderTexture(512,512,24);
		m_RenderTexture.useMipMap = true;//需要生成mipmap
		m_RenderTexture.wrapMode = TextureWrapMode.Clamp;


		//生成新的Camera
		m_Camera = new GameObject("m_Camera", typeof(Camera));
		m_Camera.GetComponent<Camera>().orthographic = true;
		m_Camera.GetComponent<Camera>().orthographicSize = this.GetComponent<RectTransform>().rect.height / 2;
		m_Camera.GetComponent<Camera>().aspect = this.GetComponent<RectTransform>().rect.width / this.GetComponent<RectTransform>().rect.height;
		m_Camera.GetComponent<Camera>().clearFlags = CameraClearFlags.Depth;
		m_Camera.GetComponent<Camera>().targetTexture = m_RenderTexture;
		m_Camera.GetComponent<Transform>().position = this.GetComponent<Transform>().position;


		//生成新的Canvas
		m_Canvas = new GameObject("m_Canvas", typeof(Canvas));
		m_Canvas.GetComponent<Transform>().position = MainCanvas.GetComponent<Transform>().position;//复制位置
		m_Canvas.GetComponent<RectTransform>().sizeDelta = MainCanvas.GetComponent<RectTransform>().sizeDelta;//复制大小
		m_Canvas.GetComponent<Canvas>().renderMode = RenderMode.WorldSpace;//ScreenSpaceCamera;最终采用了world模式,相机大小可控
		m_Canvas.GetComponent<Canvas>().worldCamera = m_Camera.GetComponent<Camera>();


		//生成新的RawImage  
		m_RawImage = new GameObject("m_RawImage", typeof(RawImage));
		m_RawImage.GetComponent<Transform>().SetParent(this.transform.parent);
		m_RawImage.GetComponent<RectTransform>().sizeDelta = this.GetComponent<RectTransform>().sizeDelta;//复制大小
		m_RawImage.GetComponent<RectTransform>().pivot = this.GetComponent<RectTransform>().pivot;//复制pivot坐标
		m_RawImage.GetComponent<RectTransform>().anchoredPosition3D = this.GetComponent<RectTransform>().anchoredPosition3D;//复制局部坐标 


		Transform OrignTransformParent =  this.transform.parent;//先记录一下原本的父对象
		this.GetComponent<Transform>().SetParent(m_Canvas.GetComponent<Transform>(), true);//将此GameObject转移至新的Canvas下，拍完照再转移回来
		Vector3 tmp_pos = this.transform.position;
		tmp_pos.z -= 1;//为了使相机照到
		m_Camera.GetComponent<Transform>().position = tmp_pos;
		
        m_Camera.GetComponent<Camera>().Render();
		m_RawImage.GetComponent<RawImage>().texture = m_RenderTexture;//新的RawImage的材质需要生成
		m_Camera.GetComponent<Camera>().targetTexture = null;
		

		//获取RenderTexture结束 销毁新canvas与新相机
		this.GetComponent<Transform>().SetParent(OrignTransformParent, true);//转移回原来的父对象
		this.GetComponent<Text>().enabled = false;
		Destroy(m_Canvas, 0);
		Destroy(m_Camera, 0);

		//调整m_RawImage
		m_RawImage.GetComponent<RawImage>().material = new Material(m_shader);
		m_material = m_RawImage.GetComponent<RawImage>().material;
		m_material.SetTexture("_WaveMap",WaveMap);
		float x = 1f / m_RawImage.GetComponent<RectTransform>().sizeDelta.x;
		float y = 1f / m_RawImage.GetComponent<RectTransform>().sizeDelta.y;
		m_material.SetFloat("_StepLength", Mathf.Sqrt(x * x + y * y));

		DeltaPS = CurBlurSpread / Delay;
	}

	//模糊结束
	void EndBlur(){
		Text txt = this.GetComponent<Text>();
		if (txt != null)
			txt.enabled = true;

		Destroy(m_RawImage, 0);
	}
	
	void CalculateBlur () {
		//倒放
		if (CurBlurSpread > 0){
		 	CurBlurSpread -= DeltaPS * Time.deltaTime;
			Offset.x -= WaveFactor;
		}
		if (CurBlurSpread < 0)
		 	CurBlurSpread = 0;

		if (CurBlurSpread > 6) MipMapLeavel = 4;
		else if (CurBlurSpread > 2) MipMapLeavel = 3;
		else if (CurBlurSpread > 1) MipMapLeavel = 2;
		else if (CurBlurSpread > 0) MipMapLeavel = 1;
		else if (CurBlurSpread == 0) MipMapLeavel = 0;

		m_material.SetFloat("_MipMapLeavel", MipMapLeavel);
		m_material.SetFloat("_BlurSpread", CurBlurSpread);
		m_material.SetTextureScale("_WaveMap", Tiling);
		m_material.SetTextureOffset("_WaveMap", Offset);
	}


	void Update(){
		if (m_RawImage != null)
			CalculateBlur();
	}
}