From 1362b1874b9d65bcd29e8ea013c296f2d1e29014 Mon Sep 17 00:00:00 2001
From: mob-sakai <12690315+mob-sakai@users.noreply.github.com>
Date: Thu, 31 Oct 2024 16:23:56 +0900
Subject: [PATCH] feat: add `power` option for SoftMaskable element

---
 Packages/src/Editor/SoftMaskableEditor.cs |  3 ++
 Packages/src/Runtime/SoftMaskable.cs      | 36 +++++++++++++++++++++--
 Packages/src/Shaders/SoftMask.cginc       |  3 +-
 3 files changed, 38 insertions(+), 4 deletions(-)

diff --git a/Packages/src/Editor/SoftMaskableEditor.cs b/Packages/src/Editor/SoftMaskableEditor.cs
index 9663856..fadf8cd 100644
--- a/Packages/src/Editor/SoftMaskableEditor.cs
+++ b/Packages/src/Editor/SoftMaskableEditor.cs
@@ -10,11 +10,13 @@ public class SoftMaskableEditor : AutoGeneratedEditor
     {
         private SerializedProperty _ignoreSelf;
         private SerializedProperty _ignoreChildren;
+        private SerializedProperty _power;
 
         private void OnEnable()
         {
             _ignoreSelf = serializedObject.FindProperty("m_IgnoreSelf");
             _ignoreChildren = serializedObject.FindProperty("m_IgnoreChildren");
+            _power = serializedObject.FindProperty("m_Power");
         }
 
         public override void OnInspectorGUI()
@@ -27,6 +29,7 @@ public override void OnInspectorGUI()
             serializedObject.Update();
             DrawProperty(_ignoreSelf, x => x.SetMaterialDirty());
             DrawProperty(_ignoreChildren, x => x.SetMaterialDirtyForChildren());
+            DrawProperty(_power, x => x.SetMaterialDirty());
             serializedObject.ApplyModifiedProperties();
 
             if (targets.Length == 1 && target is SoftMaskable softMaskable && softMaskable.ignored)
diff --git a/Packages/src/Runtime/SoftMaskable.cs b/Packages/src/Runtime/SoftMaskable.cs
index 106c0e7..9867199 100755
--- a/Packages/src/Runtime/SoftMaskable.cs
+++ b/Packages/src/Runtime/SoftMaskable.cs
@@ -15,6 +15,9 @@ public class SoftMaskable : MonoBehaviour, IMaterialModifier, IMaskable
 #endif
         private static readonly int s_AllowDynamicResolution = Shader.PropertyToID("_AllowDynamicResolution");
         private static readonly int s_AllowRenderScale = Shader.PropertyToID("_AllowRenderScale");
+        private static readonly int s_SoftMaskingPower = Shader.PropertyToID("_SoftMaskingPower");
+        private const float k_PowerMin = 1f;
+        private const float k_PowerMax = 5f;
 
         [Tooltip("The graphic is ignored when soft-masking.")]
         [SerializeField]
@@ -24,6 +27,13 @@ public class SoftMaskable : MonoBehaviour, IMaterialModifier, IMaskable
         [SerializeField]
         private bool m_IgnoreChildren;
 
+        [Tooltip("Soft masking power.\n" +
+                 "The higher this value, the faster it becomes transparent.\n" +
+                 "If overlapping objects appear see-through, please adjust this value.")]
+        [SerializeField]
+        [Range(k_PowerMin, k_PowerMax)]
+        private float m_Power = 1f;
+
         /// <summary>
         /// The graphic is ignored when soft-masking.
         /// </summary>
@@ -81,6 +91,23 @@ public bool ignored
             }
         }
 
+        /// <summary>
+        /// Soft masking power.
+        /// The higher this value, the faster it becomes transparent.
+        /// If overlapping objects appear see-through, please adjust this value.
+        /// </summary>
+        public float power
+        {
+            get => m_Power;
+            set
+            {
+                value = Mathf.Clamp(value, k_PowerMin, k_PowerMax);
+                if (Mathf.Approximately(m_Power, value)) return;
+                m_Power = value;
+                SetMaterialDirty();
+            }
+        }
+
         private Action _checkGraphic;
         private MaskableGraphic _graphic;
         private Material _maskableMaterial;
@@ -183,7 +210,7 @@ Material IMaterialModifier.GetModifiedMaterial(Material baseMaterial)
             Profiler.BeginSample("(SM4UI)[SoftMaskable] GetModifiedMaterial");
             var isStereo = UISoftMaskProjectSettings.stereoEnabled && _graphic.canvas.IsStereoCanvas();
             var useStencil = UISoftMaskProjectSettings.useStencilOutsideScreen;
-            var localId = 0u;
+            var localId = (uint)(Mathf.InverseLerp(k_PowerMin, k_PowerMax, power) * (1 << 10));
 #if UNITY_EDITOR
             var threshold = 0f;
             var subtract = false;
@@ -200,7 +227,7 @@ Material IMaterialModifier.GetModifiedMaterial(Material baseMaterial)
                 }
             }
 
-            localId = (uint)(Mathf.Clamp01(threshold) * (1 << 8) + (subtract ? 1 << 9 : 0));
+            localId = (uint)(Mathf.Clamp01(threshold) * (1 << 8) + (subtract ? 1 << 9 : 0) + (localId << 10));
 #endif
 
             var hash = new Hash128(
@@ -220,6 +247,7 @@ Material IMaterialModifier.GetModifiedMaterial(Material baseMaterial)
 #endif
             _maskableMaterial.SetInt(s_AllowDynamicResolution, _softMask.allowDynamicResolution ? 1 : 0);
             _maskableMaterial.SetInt(s_AllowRenderScale, _softMask.allowRenderScale ? 1 : 0);
+            _maskableMaterial.SetFloat(s_SoftMaskingPower, power);
             return _maskableMaterial;
         }
 
@@ -270,7 +298,9 @@ public void SetMaterialDirtyForChildren()
 
         private void UpdateHideFlags()
         {
-            hideFlags = ignoreSelf || ignoreChildren ? HideFlags.None : HideFlags.DontSave;
+            hideFlags = ignoreSelf || ignoreChildren || !Mathf.Approximately(power, 1f)
+                ? HideFlags.None
+                : HideFlags.DontSave;
         }
 
 #if UNITY_EDITOR
diff --git a/Packages/src/Shaders/SoftMask.cginc b/Packages/src/Shaders/SoftMask.cginc
index 81b375a..9a11c02 100644
--- a/Packages/src/Shaders/SoftMask.cginc
+++ b/Packages/src/Shaders/SoftMask.cginc
@@ -18,6 +18,7 @@ uniform float _RenderScale;
 uniform float2 _DynamicResolutionScale;
 uniform int _AllowRenderScale;
 uniform int _AllowDynamicResolution;
+uniform float _SoftMaskingPower;
 
 float Approximately(float4x4 a, float4x4 b)
 {
@@ -116,7 +117,7 @@ float SoftMaskSample(float2 uv, float a)
 #endif
 #endif
 
-    return alpha.x * alpha.y * alpha.z * alpha.w;
+    return pow(alpha.x * alpha.y * alpha.z * alpha.w, _SoftMaskingPower);
 }
 
 void SoftMaskForGraph_float(float4 ScreenPos, float4 WorldPos, float InAlpha, out float A)