From 0c466b28bbfeac8a4e0c3c61038290621c4f9f4f Mon Sep 17 00:00:00 2001
From: John Hurliman
Date: Tue, 27 Oct 2009 16:24:43 -0700
Subject: Move the calculation of time dilation from the scene to the physics
 engine. The scene is still the one reporting dilation so this does not break
 the API or remove flexibility, but it gets the calculation happening in the
 right place for the normal OpenSim usage. The actual calculation of physics
 time dilation probably needs tweaking

---
 OpenSim/Region/Framework/Scenes/Scene.cs       | 19 ++++++-------------
 OpenSim/Region/Framework/Scenes/SceneBase.cs   |  3 +--
 OpenSim/Region/Physics/Manager/PhysicsScene.cs |  5 +++++
 OpenSim/Region/Physics/OdePlugin/OdePlugin.cs  | 11 +++++++++--
 4 files changed, 21 insertions(+), 17 deletions(-)

diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index 7c3875d..3b8cd1e 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -135,6 +135,11 @@ namespace OpenSim.Region.Framework.Scenes
         protected SceneCommunicationService m_sceneGridService;
         public bool loginsdisabled = true;
 
+        public float TimeDilation
+        {
+            get { return m_sceneGraph.PhysicsScene.TimeDilation; }
+        }
+
         public SceneCommunicationService SceneGridService
         {
             get { return m_sceneGridService; }
@@ -1094,7 +1099,7 @@ namespace OpenSim.Region.Framework.Scenes
                         // if (m_frame%m_update_avatars == 0)
                         //   UpdateInWorldTime();
                         StatsReporter.AddPhysicsFPS(physicsFPS);
-                        StatsReporter.AddTimeDilation(m_timedilation);
+                        StatsReporter.AddTimeDilation(TimeDilation);
                         StatsReporter.AddFPS(1);
                         StatsReporter.AddInPackets(0);
                         StatsReporter.SetRootAgents(m_sceneGraph.GetRootAgentCount());
@@ -1141,18 +1146,6 @@ namespace OpenSim.Region.Framework.Scenes
                 }
                 finally
                 {
-                    //updateLock.ReleaseMutex();
-                    // Get actual time dilation
-                    float tmpval = (m_timespan / (float)SinceLastFrame.TotalSeconds);
-
-                    // If actual time dilation is greater then one, we're catching up, so subtract
-                    // the amount that's greater then 1 from the time dilation
-                    if (tmpval > 1.0)
-                    {
-                        tmpval = tmpval - (tmpval - 1.0f);
-                    }
-                    m_timedilation = tmpval;
-
                     m_lastupdate = DateTime.UtcNow;
                 }
                 maintc = Environment.TickCount - maintc;
diff --git a/OpenSim/Region/Framework/Scenes/SceneBase.cs b/OpenSim/Region/Framework/Scenes/SceneBase.cs
index 82731d1..1547f9a 100644
--- a/OpenSim/Region/Framework/Scenes/SceneBase.cs
+++ b/OpenSim/Region/Framework/Scenes/SceneBase.cs
@@ -106,9 +106,8 @@ namespace OpenSim.Region.Framework.Scenes
 
         public float TimeDilation
         {
-            get { return m_timedilation; }
+            get { return 1.0f; }
         }
-        protected float m_timedilation = 1.0f;
 
         protected ulong m_regionHandle;
         protected string m_regionName;
diff --git a/OpenSim/Region/Physics/Manager/PhysicsScene.cs b/OpenSim/Region/Physics/Manager/PhysicsScene.cs
index bb0d18e..6d515e9 100644
--- a/OpenSim/Region/Physics/Manager/PhysicsScene.cs
+++ b/OpenSim/Region/Physics/Manager/PhysicsScene.cs
@@ -75,6 +75,11 @@ namespace OpenSim.Region.Physics.Manager
         public abstract PhysicsActor AddPrimShape(string primName, PrimitiveBaseShape pbs, Vector3 position,
                                                   Vector3 size, Quaternion rotation, bool isPhysical);
 
+        public virtual float TimeDilation
+        {
+            get { return 1.0f; }
+        }
+
         public virtual bool SupportsNINJAJoints
         {
             get { return false; }
diff --git a/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs b/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs
index 2f42646..9e36020 100644
--- a/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs
+++ b/OpenSim/Region/Physics/OdePlugin/OdePlugin.cs
@@ -159,6 +159,7 @@ namespace OpenSim.Region.Physics.OdePlugin
 
         private float ODE_STEPSIZE = 0.020f;
         private float metersInSpace = 29.9f;
+        private float m_timeDilation = 1.0f;
 
         public float gravityx = 0f;
         public float gravityy = 0f;
@@ -1750,6 +1751,11 @@ namespace OpenSim.Region.Physics.OdePlugin
             return result;
         }
 
+        public override float TimeDilation
+        {
+            get { return m_timeDilation; }
+        }
+
         public override bool SupportsNINJAJoints
         {
             get { return m_NINJA_physics_joints_enabled; }
@@ -2657,8 +2663,9 @@ namespace OpenSim.Region.Physics.OdePlugin
 
                 // Figure out the Frames Per Second we're going at.
                 //(step_time == 0.004f, there's 250 of those per second.   Times the step time/step size
-                
-                fps = (step_time/ODE_STEPSIZE) * 1000;
+
+                fps = (step_time / ODE_STEPSIZE) * 1000;
+                m_timeDilation = (step_time / ODE_STEPSIZE) / (0.09375f / ODE_STEPSIZE);
 
                 step_time = 0.09375f;
 
-- 
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