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This commit is contained in:
StarBeats 2025-10-11 14:51:32 +08:00
parent 290a6a6529
commit 8ef01bce47
2 changed files with 43 additions and 66 deletions
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107
Assets/Scripts/UIImageAlphaMask.cs
View File

@ -1,104 +1,71 @@
using System.Linq;
using UnityEditor;
using UnityEngine;
using UnityEngine.UI;
[ExecuteInEditMode]
[RequireComponent(typeof(Image))]
public class UIImageAlphaMask : MonoBehaviour
{
private Image m_MaskImage;
private Canvas m_Canvas;
private RectTransform m_RectTransform;
private Image[] m_TargetImageList;
private Material m_Material;
private Canvas canvas;
private RectTransform rectTransform;
private Image maskImage;
private Material Material
{
get
{
if (m_Material == null)
{
m_Material = new Material(Shader.Find("Hidden/UI/AlphaMask"));
}
return m_Material;
}
}
[SerializeField, HideInInspector]
private Image[] targetImageList;
private Image MaskImage
{
get
{
if (m_MaskImage == null)
{
m_MaskImage = GetComponent<Image>();
}
return m_MaskImage;
}
}
private RectTransform SelfRect
{
get
{
if (m_RectTransform == null)
{
m_RectTransform = GetComponent<RectTransform>();
}
return m_RectTransform;
}
}
[SerializeField]
public Texture2D MaskTex;
private Canvas RootCanvas
{
get
{
if (m_Canvas == null)
if (canvas == null)
{
var canvas = GetComponentInParent<Canvas>();
if (canvas != null)
{
if (canvas.rootCanvas != null)
{
m_Canvas = canvas.rootCanvas;
this.canvas = canvas.rootCanvas;
}
else
{
m_Canvas = canvas;
this.canvas = canvas;
}
}
}
return m_Canvas;
return canvas;
}
}
private void Awake()
{
maskImage = GetComponent<Image>();
rectTransform = GetComponent<RectTransform>();
private void SetMaterial(Image[] imageList, Material material)
if (targetImageList == null || targetImageList.Length <= 0)
{
if (imageList == null)
{
return;
}
for (int i = 0; i < imageList.Length; i++)
{
var image = imageList[i];
image.material = material;
targetImageList = GetComponentsInChildren<Image>(true);
targetImageList = targetImageList.Where(o => o.transform != this.transform).ToArray();
}
}
private void Update()
{
#if UNITY_EDITOR
if (!IsValid())
{
return;
}
if (m_TargetImageList == null || m_TargetImageList.Length <= 0)
if (targetImageList == null || targetImageList.Length <= 0)
{
m_TargetImageList = GetComponentsInChildren<Image>(true);
m_TargetImageList = m_TargetImageList.Where(o => o.transform != this.transform).ToArray();
SetMaterial(m_TargetImageList, Material);
targetImageList = GetComponentsInChildren<Image>(true);
targetImageList = targetImageList.Where(o => o.transform != this.transform).ToArray();
return;
}
#endif
SetProperties();
}
@ -115,8 +82,15 @@ public class UIImageAlphaMask : MonoBehaviour
return false;
}
if (MaskImage.sprite == null)
if(MaskTex == null)
{
#if UNITY_EDITOR
var path = AssetDatabase.GetAssetPath(maskImage.sprite);
if(!string.IsNullOrEmpty(path))
{
MaskTex = AssetDatabase.LoadAssetAtPath<Texture2D>(path);
}
#endif
return false;
}
@ -132,9 +106,12 @@ public class UIImageAlphaMask : MonoBehaviour
}
var matrix = CalculateMatrix(camera);
Material.SetTexture("_MaskTex", MaskImage.sprite.texture);
Material.SetMatrix("_MaskMatrix", matrix);
for (int i = 0; i < targetImageList.Length; i++)
{
var imgMat = targetImageList[i].material;
imgMat.SetTexture("_Alpha_MaskTex", MaskTex);
imgMat.SetMatrix("_MaskMatrix", matrix);
}
}
private Camera GetCamera()
@ -144,7 +121,7 @@ public class UIImageAlphaMask : MonoBehaviour
private Matrix4x4 CalculateMatrix(Camera camera)
{
var rect = CalcurateViewportRect(camera);
var rect = CalculateViewportRect(camera);
Matrix4x4 result = Matrix4x4.identity;
@ -161,11 +138,11 @@ public class UIImageAlphaMask : MonoBehaviour
return result;
}
private Rect CalcurateViewportRect(Camera camera)
private Rect CalculateViewportRect(Camera camera)
{
var corners = new Vector3[4];
SelfRect.GetWorldCorners(corners);
rectTransform.GetWorldCorners(corners);
var p1 = RectTransformUtility.WorldToScreenPoint(camera, corners[1]);
var p3 = RectTransformUtility.WorldToScreenPoint(camera, corners[3]);

4
Assets/Shaders/UI-AlphaMask.shader
View File

@ -97,12 +97,12 @@
}
sampler2D _MainTex;
sampler2D _MaskTex;
sampler2D _Alpha_MaskTex;
fixed4 frag(v2f IN) : SV_Target
{
half4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;
half4 mask = tex2D(_MaskTex, IN.maskUv);
half4 mask = tex2D(_Alpha_MaskTex, IN.maskUv);
color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
color.a *= mask.a;