From 59221d58217a440b77d504e6428bf99f10246260 Mon Sep 17 00:00:00 2001
From: mob-sakai <sakai861104@gmail.com>
Date: Tue, 21 Jun 2022 19:52:22 +0900
Subject: [PATCH] feat: display warning in inspector if using 'TEXCOORD*.zw'
 components as custom vertex stream

---
 Scripts/Editor/UIParticleEditor.cs | 72 ++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/Scripts/Editor/UIParticleEditor.cs b/Scripts/Editor/UIParticleEditor.cs
index ec73f11..efff261 100644
--- a/Scripts/Editor/UIParticleEditor.cs
+++ b/Scripts/Editor/UIParticleEditor.cs
@@ -69,6 +69,7 @@ namespace Coffee.UIExtensions
         private bool _showMax;
 
         private static readonly HashSet<Shader> s_Shaders = new HashSet<Shader>();
+        private static readonly List<ParticleSystemVertexStream> s_Streams = new List<ParticleSystemVertexStream>();
         private static readonly List<string> s_MaskablePropertyNames = new List<string>
         {
             "_Stencil",
@@ -305,9 +306,80 @@ namespace Coffee.UIExtensions
                     sp.boolValue = false;
                     so.ApplyModifiedProperties();
                 }
+
+                // Check to use 'TEXCOORD*.zw' components as custom vertex stream.
+                foreach (var psr in allPsRenderers)
+                {
+                    if (new SerializedObject(psr).FindProperty("m_UseCustomVertexStreams").boolValue == false) continue;
+                    if (psr.activeVertexStreamsCount == 0) continue;
+                    psr.GetActiveVertexStreams(s_Streams);
+
+                    if (2 < s_Streams.Select(GetUsedComponentCount).Sum())
+                    {
+                        EditorGUILayout.HelpBox(string.Format("ParticleSystem '{0}' uses 'TEXCOORD*.zw' components as custom vertex stream.\nUIParticle does not support it (See README.md).", psr.name), MessageType.Warning);
+                    }
+                }
             }
         }
 
+        private static int GetUsedComponentCount(ParticleSystemVertexStream s)
+        {
+            switch (s)
+            {
+                case ParticleSystemVertexStream.Position:
+                case ParticleSystemVertexStream.Normal:
+                case ParticleSystemVertexStream.Tangent:
+                case ParticleSystemVertexStream.Color:
+                    return 0;
+                case ParticleSystemVertexStream.UV:
+                case ParticleSystemVertexStream.UV2:
+                case ParticleSystemVertexStream.UV3:
+                case ParticleSystemVertexStream.UV4:
+                case ParticleSystemVertexStream.SizeXY:
+                case ParticleSystemVertexStream.StableRandomXY:
+                case ParticleSystemVertexStream.VaryingRandomXY:
+                case ParticleSystemVertexStream.Custom1XY:
+                case ParticleSystemVertexStream.Custom2XY:
+                case ParticleSystemVertexStream.NoiseSumXY:
+                case ParticleSystemVertexStream.NoiseImpulseXY:
+                    return 2;
+                case ParticleSystemVertexStream.AnimBlend:
+                case ParticleSystemVertexStream.AnimFrame:
+                case ParticleSystemVertexStream.VertexID:
+                case ParticleSystemVertexStream.SizeX:
+                case ParticleSystemVertexStream.Rotation:
+                case ParticleSystemVertexStream.RotationSpeed:
+                case ParticleSystemVertexStream.Velocity:
+                case ParticleSystemVertexStream.Speed:
+                case ParticleSystemVertexStream.AgePercent:
+                case ParticleSystemVertexStream.InvStartLifetime:
+                case ParticleSystemVertexStream.StableRandomX:
+                case ParticleSystemVertexStream.VaryingRandomX:
+                case ParticleSystemVertexStream.Custom1X:
+                case ParticleSystemVertexStream.Custom2X:
+                case ParticleSystemVertexStream.NoiseSumX:
+                case ParticleSystemVertexStream.NoiseImpulseX:
+                    return 1;
+                case ParticleSystemVertexStream.Center:
+                case ParticleSystemVertexStream.SizeXYZ:
+                case ParticleSystemVertexStream.Rotation3D:
+                case ParticleSystemVertexStream.RotationSpeed3D:
+                case ParticleSystemVertexStream.StableRandomXYZ:
+                case ParticleSystemVertexStream.VaryingRandomXYZ:
+                case ParticleSystemVertexStream.Custom1XYZ:
+                case ParticleSystemVertexStream.Custom2XYZ:
+                case ParticleSystemVertexStream.NoiseSumXYZ:
+                case ParticleSystemVertexStream.NoiseImpulseXYZ:
+                    return 3;
+                case ParticleSystemVertexStream.StableRandomXYZW:
+                case ParticleSystemVertexStream.VaryingRandomXYZW:
+                case ParticleSystemVertexStream.Custom1XYZW:
+                case ParticleSystemVertexStream.Custom2XYZW:
+                    return 4;
+            }
+            return 3;
+        }
+
         private static bool DrawMeshSharing(SerializedProperty spMeshSharing, SerializedProperty spGroupId, SerializedProperty spGroupMaxId, bool showMax)
         {
             showMax |= spGroupId.intValue != spGroupMaxId.intValue ||