From b17c5ca3e684fc1bb1a42adff141bd13e6993a08 Mon Sep 17 00:00:00 2001
From: amzn-sean <75276488+amzn-sean@users.noreply.github.com>
Date: Fri, 18 Jun 2021 14:09:34 +0100
Subject: [PATCH] adding physics tick time to post simulate event (#1401)

---
 .../AzFramework/AzFramework/Physics/Common/PhysicsEvents.h     | 3 ++-
 .../AzFramework/AzFramework/Physics/PhysicsSystem.cpp          | 2 +-
 Gems/PhysX/Code/Source/System/PhysXSystem.cpp                  | 2 +-
 Gems/PhysX/Code/Tests/PhysXSystemTests.cpp                     | 3 ++-
 4 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/Code/Framework/AzFramework/AzFramework/Physics/Common/PhysicsEvents.h b/Code/Framework/AzFramework/AzFramework/Physics/Common/PhysicsEvents.h
index a3a34dc1df..e0a89e14ac 100644
--- a/Code/Framework/AzFramework/AzFramework/Physics/Common/PhysicsEvents.h
+++ b/Code/Framework/AzFramework/AzFramework/Physics/Common/PhysicsEvents.h
@@ -48,7 +48,8 @@ namespace AzPhysics
         using OnPresimulateEvent = AZ::Event<float>;
 
         //! Event triggers at the end of the SystemInterface::Simulate call.
-        using OnPostsimulateEvent = AZ::Event<>;
+        //! Parameter is the total time that the physics system will run for during the Simulate call.
+        using OnPostsimulateEvent = AZ::Event<float>;
 
         //! Event trigger when a Scene is added to the simulation.
         //! When triggered will send the handle to the new Scene.
diff --git a/Code/Framework/AzFramework/AzFramework/Physics/PhysicsSystem.cpp b/Code/Framework/AzFramework/AzFramework/Physics/PhysicsSystem.cpp
index 289b5a940b..aa17b7ec83 100644
--- a/Code/Framework/AzFramework/AzFramework/Physics/PhysicsSystem.cpp
+++ b/Code/Framework/AzFramework/AzFramework/Physics/PhysicsSystem.cpp
@@ -43,7 +43,7 @@ namespace AzPhysics
             const AZ::BehaviorAzEventDescription postsimulateEventDescription =
             {
                 "Postsimulate event",
-                {} // Parameters
+                {"Tick time"} // Parameters
             };
 
             behaviorContext->Class<SystemInterface>("System Interface")
diff --git a/Gems/PhysX/Code/Source/System/PhysXSystem.cpp b/Gems/PhysX/Code/Source/System/PhysXSystem.cpp
index 92f68ea13b..0e4c72b77e 100644
--- a/Gems/PhysX/Code/Source/System/PhysXSystem.cpp
+++ b/Gems/PhysX/Code/Source/System/PhysXSystem.cpp
@@ -198,7 +198,7 @@ namespace PhysX
 
             simulateScenes(tickTime);
         }
-        m_postSimulateEvent.Signal();
+        m_postSimulateEvent.Signal(tickTime);
     }
 
     AzPhysics::SceneHandle PhysXSystem::AddScene(const AzPhysics::SceneConfiguration& config)
diff --git a/Gems/PhysX/Code/Tests/PhysXSystemTests.cpp b/Gems/PhysX/Code/Tests/PhysXSystemTests.cpp
index 5c3636d040..910a421b65 100644
--- a/Gems/PhysX/Code/Tests/PhysXSystemTests.cpp
+++ b/Gems/PhysX/Code/Tests/PhysXSystemTests.cpp
@@ -219,8 +219,9 @@ namespace PhysX
                 preSimEventCount++;
             });
         AzPhysics::SystemEvents::OnPostsimulateEvent::Handler postSimEvent(
-            [&postSimEventCount]()
+            [&expectedTickTime, &postSimEventCount](float deltaTime)
             {
+                EXPECT_NEAR(expectedTickTime, deltaTime, 0.001f);
                 postSimEventCount++;
             });
         physicsSystem->RegisterPreSimulateEvent(preSimEvent);