From 1c29f3378dd13e8c95eca944e3240e2a874b61fa Mon Sep 17 00:00:00 2001
From: UbitUmarov <ajlduarte@sapo.pt>
Date: Tue, 16 Feb 2021 03:16:54 +0000
Subject: [PATCH] mantis 8865: add experimental osNpcLookAt

---
 .../Shared/Api/Implementation/OSSL_Api.cs     | 58 +++++++++++++++++++
 .../Shared/Api/Interface/IOSSL_Api.cs         |  2 +
 .../Shared/Api/Runtime/OSSL_Stub.cs           |  5 ++
 3 files changed, 65 insertions(+)

diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
index 3f4bbed945..a1905d504e 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/OSSL_Api.cs
@@ -6068,5 +6068,63 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api
             }
         }
 
+        public LSL_Integer osNpcLookAt(LSL_Key npckey, LSL_Integer ltype, LSL_Key objkey, LSL_Vector offset)
+        {
+            if (World.GetNumberOfClients() == 0)
+                return 0;
+
+            if (ltype < 0 || ltype > 11)
+                return -1;
+
+            if (!UUID.TryParse(npckey, out UUID npc))
+                return -2;
+
+            ScenePresence npcSP = World.GetScenePresence(npc);
+            if(npc == null)
+                return -3;
+
+            if (!UUID.TryParse(objkey, out UUID obj))
+                return -4;
+
+            if(obj != UUID.Zero)
+            {
+                ScenePresence objSP = World.GetScenePresence(obj);
+                if(objSP == null)
+                {
+                    SceneObjectPart objSOP = World.GetSceneObjectPart(obj);
+                    if(objSOP == null)
+                        return -5;
+                }
+            }
+
+            byte[] data = new byte[57];
+            npc.ToBytes(data, 0);
+            obj.ToBytes(data, 16);
+            Vector3d vd = new Vector3d(offset.x, offset.y, offset.z);
+            vd.ToBytes(data, 32);
+            data[56] = (byte)(int)ltype;
+
+            OpenMetaverse.Packets.ViewerEffectPacket.EffectBlock effect = new OpenMetaverse.Packets.ViewerEffectPacket.EffectBlock();
+            effect.AgentID = npc;
+            effect.Color = new byte[4];
+            effect.Duration = 0;
+            effect.ID = UUID.Random();
+            effect.Type = 14;
+            effect.TypeData = data;
+
+            OpenMetaverse.Packets.ViewerEffectPacket.EffectBlock[] effectblock = new OpenMetaverse.Packets.ViewerEffectPacket.EffectBlock[1];
+            effectblock[0] = effect;
+
+            World.ForEachScenePresence(
+             sp =>
+             {
+                if(!sp.IsNPC && !sp.IsDeleted)
+                {
+                    sp.ControllingClient.SendViewerEffect(effectblock);
+                }
+             });
+
+            return 0;
+        }
     }
 }
\ No newline at end of file
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs
index 3e079dbc12..105789f4aa 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Interface/IOSSL_Api.cs
@@ -589,5 +589,7 @@ namespace OpenSim.Region.ScriptEngine.Shared.Api.Interfaces
 
         void osParticleSystem(LSL_List rules);
         void osLinkParticleSystem(LSL_Integer linknumber, LSL_List rules);
+
+        LSL_Integer osNpcLookAt(LSL_Key npckey, LSL_Integer type, LSL_Key objkey, vector offset);
     }
 }
diff --git a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
index 5edbca66cc..26ff160310 100644
--- a/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
+++ b/OpenSim/Region/ScriptEngine/Shared/Api/Runtime/OSSL_Stub.cs
@@ -1543,5 +1543,10 @@ namespace OpenSim.Region.ScriptEngine.Shared.ScriptBase
         {
             m_OSSL_Functions.osLinkParticleSystem(linknumber, rules);
         }
+
+        public LSL_Integer osNpcLookAt(LSL_Key npckey, LSL_Integer type, LSL_Key objkey, vector offset)
+        {
+            return m_OSSL_Functions.osNpcLookAt(npckey, type, objkey, offset);
+        }
     }
 }