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