116 lines
3.3 KiB
C#
116 lines
3.3 KiB
C#
using UnityEngine;
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using UnityEngine.UI;
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public class ScratchMask : MonoBehaviour
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{
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public RawImage maskImage; // 黑白图
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public Texture2D brushTex; // 笔刷纹理
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Camera uiCamera; // Canvas 摄像机
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public int rtResolution = 1024; // 遮罩精度
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private Texture2D readTex; // 遮罩纹理
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bool HasRevealed = false;
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public float revealThreshold = 0.8f; // 擦除面积阈值 (30%)
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private RenderTexture maskRT;
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private Material mat;
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void Start()
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{
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// 创建遮罩 RT
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maskRT = new RenderTexture(rtResolution, rtResolution, 0);
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maskRT.Create();
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uiCamera = Camera.main;
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// 填满为白色（遮罩默认不透明）
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RenderTexture.active = maskRT;
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GL.Clear(true, true, Color.white);
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RenderTexture.active = null;
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// 获取材质并设置遮罩纹理
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mat = maskImage.material;
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mat.SetTexture("_MaskTex", maskRT);
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}
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void Update()
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{
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if (Input.GetMouseButton(0))
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{
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Vector2 localPos;
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RectTransformUtility.ScreenPointToLocalPointInRectangle(
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maskImage.rectTransform,
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Input.mousePosition,
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uiCamera,
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out localPos
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);
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Vector2 uv = new Vector2(
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(localPos.x + maskImage.rectTransform.rect.width / 2) / maskImage.rectTransform.rect.width,
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(localPos.y + maskImage.rectTransform.rect.height / 2) / maskImage.rectTransform.rect.height
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);
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DrawBrush(uv);
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CheckRevealProgress();
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}
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}
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void DrawBrush(Vector2 uv)
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{
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// int px = (int)(uv.x * maskRT.width);
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// int py = (int)(uv.y * maskRT.height);
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int px = (int)(uv.x * maskRT.width);
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// 反转 Y：
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int py = maskRT.height - (int)(uv.y * maskRT.height);
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RenderTexture.active = maskRT;
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GL.PushMatrix();
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GL.LoadPixelMatrix(0, maskRT.width, maskRT.height, 0);
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// GL.LoadPixelMatrix(0, maskRT.width, 0, maskRT.height);
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Graphics.DrawTexture(
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new Rect(px - brushTex.width / 2, py - brushTex.height / 2, brushTex.width, brushTex.height),
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brushTex
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);
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GL.PopMatrix();
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RenderTexture.active = null;
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}
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void CheckRevealProgress()
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{
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if (HasRevealed) return;
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RenderTexture.active = maskRT;
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if (readTex == null)
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readTex = new Texture2D(maskRT.width, maskRT.height, TextureFormat.RGB24, false);
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readTex.ReadPixels(new Rect(0, 0, maskRT.width, maskRT.height), 0, 0);
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readTex.Apply();
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int clearCount = 0;
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Color[] pixels = readTex.GetPixels();
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foreach (var pixel in pixels)
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{
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if (pixel.r < 0.5f) // 黑色（已擦除）
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clearCount++;
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}
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float percent = clearCount / (float)pixels.Length;
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if (percent > revealThreshold)
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{
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Debug.Log("✔️ 已擦除足够区域，显示彩色图！");
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RevealColorImage();
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HasRevealed = true;
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}
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RenderTexture.active = null;
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}
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void RevealColorImage()
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{
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maskImage.gameObject.SetActive(false); // 隐藏黑白图
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// 或者：maskImage.color = new Color(1,1,1,0);
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}
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}
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