一些特效

Packages/NBShaders/Runtime/NBShaderSpriteHelper.cs

@@ -0,0 +1,90 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+// using Sirenix.OdinInspector;
+
+[ExecuteAlways]
+public class NBShaderSpriteHelper : MonoBehaviour
+{
+    public Sprite sprite;
+    // [ReadOnly]
+    public SpriteRenderer spRenderer;
+    // [ReadOnly]
+    public Image image;
+
+    [InspectorButton("初始化","Init")]
+    public bool ButtomInspector;
+
+    private Material mat;
+    
+    
+    
+    // Start is called before the first frame update
+    void Start()
+    {
+        Init();
+    }
+    
+    void Init()
+    {
+        if (TryGetComponent<SpriteRenderer>(out SpriteRenderer spr))
+        {
+            spRenderer = spr;
+            sprite = spr.sprite;
+        }
+        else
+        {
+            if (TryGetComponent<Image>(out Image im))
+            {
+                image = im;
+                sprite = im.sprite;
+            }
+        }
+
+        
+
+        if (sprite)
+        {
+           Texture texture = sprite.texture;
+           Rect rect = sprite.textureRect;
+           // sharedMaterial.SetVector("_BaseMapReverseST",CalScaleOffset(spRenderer.sprite.textureRect,spRenderer.sprite.texture));
+
+            if (spRenderer)
+            {
+                if (Application.isPlaying)
+                {
+                    mat = spRenderer.material;
+                }
+                else
+                {
+                    mat = spRenderer.sharedMaterial;
+                }
+            }
+            else if(image)
+            {
+                mat = image.material;
+            }
+
+            if (mat && mat.shader.name == "XuanXuan/Effects/Particle_NiuBi")
+            {
+                mat.SetVector("_MainTex_Reverse_ST",CalScaleOffset(rect,texture));
+                Debug.Log(mat.name);
+            }
+        }
+     
+        
+   
+    }
+
+    Vector4 CalScaleOffset(Rect textureRect,Texture texture)
+    {
+        //这是一个反向的scale offset。
+        //算法：如果原scale offset。转换后会是 scaleAfter= 1 / scale , offsetAfter = - offset/scale;
+        Vector2 scaleAfter = new Vector2(texture.width / textureRect.width, texture.height / textureRect.height);
+        Vector2 offsetAfter = new Vector2(-(textureRect.x / texture.width) * scaleAfter.x,
+            -(textureRect.y / texture.height) * scaleAfter.y);
+        Vector4 scaleOffset = new Vector4(scaleAfter.x,scaleAfter.y,offsetAfter.x,offsetAfter.y);
+        return scaleOffset;
+    }
+}