Merge pull request #1897 from Unity-Technologies/HDRP/decals/projector_api

Add API call to add and update projector decals without specifying th…

com.unity.render-pipelines.high-definition/CHANGELOG.md

 
 ### Added
  - Added controls for linear fade at the boundary of density volumes
+ - Added new API to control decals without monobehaviour object
 
 ### Fixed
 - Stencil test during decals normal buffer update is now properly applied

com.unity.render-pipelines.high-definition/HDRP/Material/Decal/DecalSystem.cs

                 return res;
             }
 
-            public void UpdateCachedData(Transform transform, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, DecalHandle handle)
+            public void UpdateCachedData(Matrix4x4 localToWorld, Quaternion rotation, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, DecalHandle handle)
-                if (m_Material == null)
-                    return;
-                m_CachedDecalToWorld[index] = transform.localToWorldMatrix * sizeOffset;
+                m_CachedDecalToWorld[index] = localToWorld * sizeOffset;
+                Matrix4x4 decalRotation = Matrix4x4.Rotate(rotation);
-                Matrix4x4 decalRotation = Matrix4x4.Rotate(transform.rotation);
                 // z/y axis swap for normal to decal space, Unity is column major
                 float y0 = decalRotation.m01;
                 float y1 = decalRotation.m11;
                 m_BoundingSpheres[index] = GetDecalProjectBoundingSphere(m_CachedDecalToWorld[index]);
             }
 
-            public DecalHandle AddDecal(Transform transform, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, int materialID)
+            public void UpdateCachedData(Transform transform, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, DecalHandle handle)
+            {
+                if (m_Material == null)
+                    return;
+                UpdateCachedData(transform.localToWorldMatrix, transform.rotation, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, handle);                
+            }
+
+            public DecalHandle AddDecal(Matrix4x4 localToWorld, Quaternion rotation, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, int materialID)
             {
                 // increase array size if no space left
                 if (m_DecalsCount == m_Handles.Length)
 
                 DecalHandle decalHandle = new DecalHandle(m_DecalsCount, materialID);
                 m_Handles[m_DecalsCount] = decalHandle;
-                UpdateCachedData(transform, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, decalHandle);
+                UpdateCachedData(localToWorld, rotation, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, decalHandle);
                 m_DecalsCount++;
                 return decalHandle;
             }
             private Vector4 m_BaseColor;
             private Vector3 m_BlendParams;
             
-
-        public DecalHandle AddDecal(Transform transform, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, Material material)
+        DecalHandle AddDecal(Matrix4x4 localToWorld, Quaternion rotation, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, Material material)
         {
             DecalSet decalSet = null;
             int key = material != null ? material.GetInstanceID() : kNullMaterialIndex;
                 m_DecalSets.Add(key, decalSet);
             }
-            return decalSet.AddDecal(transform, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, key);
+            return decalSet.AddDecal(localToWorld, rotation, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, key);
+        }
+
+
+        public DecalHandle AddDecal(Vector3 position, Quaternion rotation, Vector3 scale, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, Material material)
+        {
+            return AddDecal(Matrix4x4.TRS(position, rotation, scale), rotation, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, material);
+        }
+
+        public DecalHandle AddDecal(Transform transform, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, Material material)
+        {
+            return AddDecal(transform.localToWorldMatrix, transform.rotation, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, material);
         }
 
         public void RemoveDecal(DecalHandle handle)
             }
         }
 
-        public void UpdateCachedData(Transform transform, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, DecalHandle handle)
+        void UpdateCachedData(Matrix4x4 localToWorld, Quaternion rotation, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, DecalHandle handle)
         {
             if (!DecalHandle.IsValid(handle))
                 return;
             if (m_DecalSets.TryGetValue(key, out decalSet))
             {
-                decalSet.UpdateCachedData(transform, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, handle);
+                decalSet.UpdateCachedData(localToWorld, rotation, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, handle);
+        }
+
+        public void UpdateCachedData(Vector3 position, Quaternion rotation, Vector3 scale, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, DecalHandle handle)
+        {
+             UpdateCachedData(Matrix4x4.TRS(position,  rotation, scale), rotation, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, handle);
+        }
+
+        public void UpdateCachedData(Transform transform, Matrix4x4 sizeOffset, float drawDistance, float fadeScale, Vector4 uvScaleBias, bool affectsTransparency, DecalHandle handle)
+        {
+            UpdateCachedData(transform.localToWorldMatrix, transform.rotation, sizeOffset, drawDistance, fadeScale, uvScaleBias, affectsTransparency, handle);
         }
 
         public void BeginCull()