Merge pull request #4251 from aws-lumberyard-dev/nvsickle/RevertFrameTimer

Revert "Refresh rate driven rendering tick logic (#3375)"

Code/Editor/Core/QtEditorApplication.cpp

@@ -44,7 +44,7 @@ enum
 {
     // in milliseconds
     GameModeIdleFrequency = 0,
-    EditorModeIdleFrequency = 0,
+    EditorModeIdleFrequency = 1,
     InactiveModeFrequency = 10,
     UninitializedFrequency = 9999,
 };

Code/Editor/TrackView/SequenceBatchRenderDialog.cpp

@@ -36,9 +36,6 @@
 #include "CryEdit.h"
 #include "Viewport.h"
 
-// Atom Renderer
-#include <Atom/RPI.Public/RPISystemInterface.h>
-
 AZ_PUSH_DISABLE_DLL_EXPORT_MEMBER_WARNING
 #include <TrackView/ui_SequenceBatchRenderDialog.h>
 AZ_POP_DISABLE_DLL_EXPORT_MEMBER_WARNING
@@ -1237,13 +1234,6 @@ void CSequenceBatchRenderDialog::OnKickIdleTimout()
         {
             componentApplication->TickSystem();
         }
-
-        // Directly tick the renderer, as it's no longer part of the system tick
-        if (auto rpiSystem = AZ::RPI::RPISystemInterface::Get())
-        {
-            rpiSystem->SimulationTick();
-            rpiSystem->RenderTick();
-        }
     }
 }
 

Code/Framework/AzCore/AzCore/Component/ComponentApplication.cpp

@@ -74,8 +74,6 @@
 #include <AzCore/Module/Environment.h>
 #include <AzCore/std/string/conversions.h>
 
-AZ_CVAR(float, g_simulation_tick_rate, 0, nullptr, AZ::ConsoleFunctorFlags::Null, "The rate at which the game simulation tick loop runs, or 0 for as fast as possible");
-
 static void PrintEntityName(const AZ::ConsoleCommandContainer& arguments)
 {
     if (arguments.empty())
@@ -1396,23 +1394,6 @@ namespace AZ
                 AZ_PROFILE_SCOPE(AzCore, "ComponentApplication::Tick:OnTick");
                 EBUS_EVENT(TickBus, OnTick, m_deltaTime, ScriptTimePoint(now));
             }
-
-            // If tick rate limiting is on, ensure (1 / g_simulation_tick_rate) ms has elapsed since the last frame,
-            // sleeping if there's still time remaining.
-            if (g_simulation_tick_rate > 0.f)
-            {
-                now = AZStd::chrono::system_clock::now();
-
-                // Work in microsecond durations here as that's the native measurement time for time_point
-                constexpr float microsecondsPerSecond = 1000.f * 1000.f;
-                const AZStd::chrono::microseconds timeBudgetPerTick(static_cast<int>(microsecondsPerSecond / g_simulation_tick_rate));
-                AZStd::chrono::microseconds timeUntilNextTick = m_currentTime + timeBudgetPerTick - now;
-
-                if (timeUntilNextTick.count() > 0)
-                {
-                    AZStd::this_thread::sleep_for(timeUntilNextTick);
-                }
-            }
         }
     }
 

Code/Framework/AzCore/AzCore/Component/TickBus.h

@@ -46,8 +46,6 @@ namespace AZ
 
         TICK_PRE_RENDER     = 750,     ///< Suggested tick handler position to update render-related data.
 
-        TICK_RENDER         = 800,     ///< Suggested tick handler position for rendering.
-
         TICK_DEFAULT        = 1000,    ///< Default tick handler position when the handler is constructed.
 
         TICK_UI             = 2000,    ///< Suggested tick handler position for UI components.

Gems/Atom/Bootstrap/Code/Include/Atom/Bootstrap/BootstrapNotificationBus.h

@@ -56,8 +56,7 @@ namespace AZ
 
                 //////////////////////////////////////////////////////////////////////////
 
-                virtual void OnBootstrapSceneReady([[maybe_unused]]AZ::RPI::Scene* bootstrapScene){}
+                virtual void OnBootstrapSceneReady(AZ::RPI::Scene* bootstrapScene) = 0;
-                virtual void OnFrameRateLimitChanged([[maybe_unused]]float fpsLimit){}
             };
             using NotificationBus = AZ::EBus<Notification>;
         } // namespace Bootstrap

Gems/Atom/Bootstrap/Code/Include/Atom/Bootstrap/BootstrapRequestBus.h

@@ -23,8 +23,6 @@ namespace AZ::Render::Bootstrap
 
         virtual AZ::RPI::ScenePtr GetOrCreateAtomSceneFromAzScene(AzFramework::Scene* scene) = 0;
         virtual bool EnsureDefaultRenderPipelineInstalledForScene(AZ::RPI::ScenePtr scene, AZ::RPI::ViewportContextPtr viewportContext) = 0;
-        virtual float GetFrameRateLimit() const = 0;
-        virtual void SetFrameRateLimit(float fpsLimit) = 0;
 
     protected:
         ~Request() = default;

Gems/Atom/Bootstrap/Code/Source/BootstrapSystemComponent.cpp

@@ -42,14 +42,7 @@
 #include <AzCore/Console/IConsole.h>
 #include <BootstrapSystemComponent_Traits_Platform.h>
 
-static void OnFrameRateLimitChanged(const float& fpsLimit)
-{
-    AZ::Render::Bootstrap::RequestBus::Broadcast(
-        &AZ::Render::Bootstrap::RequestBus::Events::SetFrameRateLimit, fpsLimit);
-}
-
 AZ_CVAR(AZ::CVarFixedString, r_default_pipeline_name, AZ_TRAIT_BOOTSTRAPSYSTEMCOMPONENT_PIPELINE_NAME, nullptr, AZ::ConsoleFunctorFlags::DontReplicate, "Default Render pipeline name");
-AZ_CVAR(float, r_fps_limit, 0, OnFrameRateLimitChanged, AZ::ConsoleFunctorFlags::Null, "The maximum framerate to render at, or 0 for unlimited");
 
 namespace AZ
 {
@@ -358,22 +351,6 @@ namespace AZ
                 return true;
             }
 
-            float BootstrapSystemComponent::GetFrameRateLimit() const
-            {
-                return r_fps_limit;
-            }
-
-            void BootstrapSystemComponent::SetFrameRateLimit(float fpsLimit)
-            {
-                r_fps_limit = fpsLimit;
-                if (m_viewportContext)
-                {
-                    m_viewportContext->SetFpsLimit(r_fps_limit);
-                }
-                Render::Bootstrap::NotificationBus::Broadcast(
-                    &Render::Bootstrap::NotificationBus::Events::OnFrameRateLimitChanged, fpsLimit);
-            }
-
             void BootstrapSystemComponent::CreateDefaultRenderPipeline()
             {
                 EnsureDefaultRenderPipelineInstalledForScene(m_defaultScene, m_viewportContext);
@@ -413,11 +390,23 @@ namespace AZ
             }
 
             void BootstrapSystemComponent::OnTick([[maybe_unused]] float deltaTime, [[maybe_unused]] ScriptTimePoint time)
-            {            }
+            {
+                // Temp: When running in the launcher without the legacy renderer
+                // we need to call RenderTick on the viewport context each frame.
+                if (m_viewportContext)
+                {
+                    AZ::ApplicationTypeQuery appType;
+                    ComponentApplicationBus::Broadcast(&AZ::ComponentApplicationBus::Events::QueryApplicationType, appType);
+                    if (appType.IsGame())
+                    {
+                        m_viewportContext->RenderTick();
+                    }
+                }
+            }
 
             int BootstrapSystemComponent::GetTickOrder()
             {
-                return TICK_PRE_RENDER;
+                return TICK_LAST;
             }
 
             void BootstrapSystemComponent::OnWindowClosed()

Gems/Atom/Bootstrap/Code/Source/BootstrapSystemComponent.h

@@ -69,8 +69,6 @@ namespace AZ
                 // Render::Bootstrap::RequestBus::Handler overrides ...
                 AZ::RPI::ScenePtr GetOrCreateAtomSceneFromAzScene(AzFramework::Scene* scene) override;
                 bool EnsureDefaultRenderPipelineInstalledForScene(AZ::RPI::ScenePtr scene, AZ::RPI::ViewportContextPtr viewportContext) override;
-                float GetFrameRateLimit() const override;
-                void SetFrameRateLimit(float fpsLimit) override;
 
             protected:
                 // Component overrides ...

Gems/Atom/RPI/Code/Include/Atom/RPI.Public/RenderPipeline.h

@@ -161,14 +161,9 @@ namespace AZ
 
             //! Add this RenderPipeline to RPI system's RenderTick and it will be rendered whenever
             //! the RPI system's RenderTick is called.
-            //! The RenderPipeline is rendered per RenderTick by default.
+            //! The RenderPipeline is rendered per RenderTick by default unless AddToRenderTickOnce() was called.
             void AddToRenderTick();
 
-            //! Add this RenderPipeline to RPI system's RenderTick and it will be rendered every RenderTick
-            //! after the specified interval has elapsed since the last rendered frame.
-            //! @param renderInterval The desired time between rendered frames, in seconds.
-            void AddToRenderTickAtInterval(AZStd::chrono::duration<float> renderInterval);
-
             //! Disable render for this RenderPipeline
             void RemoveFromRenderTick();
 
@@ -176,10 +171,9 @@ namespace AZ
                         
             enum class RenderMode : uint8_t
             {
-                RenderEveryTick, //!< Render at each RPI system render tick.
+                RenderEveryTick, // Render at each RPI system render tick
-                RenderAtTargetRate, //!< Render on RPI system render tick after a target refresh rate interval has passed.
+                RenderOnce, // Render once in next RPI system render tick
-                RenderOnce, //!< Render once in next RPI system render tick.
+                NoRender // Render disabled.
-                NoRender //!< Render disabled.
             };
 
             //! Get current render mode
@@ -191,12 +185,6 @@ namespace AZ
             //! Get draw filter mask
             RHI::DrawFilterMask GetDrawFilterMask() const;
 
-            using FrameNotificationEvent = AZ::Event<>;
-            //! Notifies a listener when a frame is about to be prepared for render, before SRGs are bound.
-            void ConnectPrepareFrameHandler(FrameNotificationEvent::Handler& handler);
-            //! Notifies a listener when the rendering of a frame has finished
-            void ConnectEndFrameHandler(FrameNotificationEvent::Handler& handler);
-
         private:
             RenderPipeline() = default;
 
@@ -214,11 +202,8 @@ namespace AZ
             void OnAddedToScene(Scene* scene);
             void OnRemovedFromScene(Scene* scene);
 
-            // Called before this pipeline is about to be rendered and before SRGs are bound.
-            void OnPrepareFrame();
-
             // Called when this pipeline is about to be rendered
-            void OnStartFrame();
+            void OnStartFrame(const TickTimeInfo& tick);
 
             // Called when the rendering of current frame is finished.
             void OnFrameEnd();
@@ -243,14 +228,8 @@ namespace AZ
             
             PipelineViewMap m_pipelineViewsByTag;
             
-            // The system time when the last time this pipeline render was started
+            /// The system time when the last time this pipeline render was started
-            AZStd::chrono::system_clock::time_point m_lastRenderStartTime;
+            float m_lastRenderStartTime = 0;
-
-            // The current system time, as of OnPrepareFrame's execution.
-            AZStd::chrono::system_clock::time_point m_lastRenderRequestTime;
-
-            // The target time between renders when m_renderMode is RenderMode::RenderAtTargetRate
-            AZStd::chrono::duration<float> m_targetRefreshRate;
             
             // RenderPipeline's name id, it will be used to identify the render pipeline when it's added to a Scene
             RenderPipelineId m_nameId;
@@ -281,10 +260,6 @@ namespace AZ
             // A mask to filter draw items submitted by passes of this render pipeline.
             // This mask is created from the value of m_drawFilterTag.
             RHI::DrawFilterMask m_drawFilterMask = 0; 
-
-            // Events for notification on render state
-            FrameNotificationEvent m_prepareFrameEvent;
-            FrameNotificationEvent m_endFrameEvent;
         };
 
     } // namespace RPI

Gems/Atom/RPI/Code/Include/Atom/RPI.Public/SceneBus.h

@@ -67,9 +67,6 @@ namespace AZ
 
             //! Notifies when the PrepareRender phase is ending
             virtual void OnEndPrepareRender() {}
-
-            //! Notifies when the render tick for a given frame has finished.
-            virtual void OnFrameEnd() {}
         };
 
         using SceneNotificationBus = AZ::EBus<SceneNotification>;

Gems/Atom/RPI/Code/Include/Atom/RPI.Public/ViewportContext.h

@@ -51,21 +51,9 @@ namespace AZ
             //! Sets the root scene associated with this viewport.
             //! This does not provide a default render pipeline, one must be provided to enable rendering.
             void SetRenderScene(ScenePtr scene);
-
+            //! Runs one simulation and render tick and renders a frame to this viewport's window.
-            //! Gets the maximum frame rate this viewport context's pipeline can render at, 0 for unlimited.
+            //! @note This is likely to be replaced by a tick management system in the RPI.
-            //! The target framerate for the pipeline will be determined by this frame limit and the
+            void RenderTick();
-            //! vsync settings for the current window.
-            float GetFpsLimit() const;
-
-            //! Sets the maximum frame rate this viewport context's pipeline can render at, 0 for unlimited.
-            //! The target framerate for the pipeline will be determined by this frame limit and the
-            //! vsync settings for the current window.
-            void SetFpsLimit(float fpsLimit);
-
-            //! Gets the target frame rate for this viewport context.
-            //! This returns the lowest of either the current VSync refresh rate
-            //! or 0 for an unlimited frame rate (if there's no FPS limit and vsync is off).
-            float GetTargetFrameRate() const;
 
             //! Gets the current name of this ViewportContext.
             //! This name is used to tie this ViewportContext to its View stack, and ViewportContexts may be
@@ -86,28 +74,19 @@ namespace AZ
             //! \see AzFramework::WindowRequests::GetDpiScaleFactor
             float GetDpiScalingFactor() const;
 
-            //! Gets the current vsync interval, as a divisor of the current refresh rate.
-            //! A value of 0 indicates that vsync is disabled.
-            uint32_t GetVsyncInterval() const;
-
-            //! Gets the current display refresh rate, in frames per second.
-            uint32_t GetRefreshRate() const;
-
             // SceneNotificationBus interface overrides...
             //! Ensures our default view remains set when our scene's render pipelines are modified.
             void OnRenderPipelineAdded(RenderPipelinePtr pipeline) override;
             //! Ensures our default view remains set when our scene's render pipelines are modified.
             void OnRenderPipelineRemoved(RenderPipeline* pipeline) override;
+            //! OnBeginPrepareRender is forwarded to our RenderTick notification to allow subscribers to do rendering.
+            void OnBeginPrepareRender() override;
 
             // WindowNotificationBus interface overrides...
             //! Used to fire a notification when our window resizes.
             void OnWindowResized(uint32_t width, uint32_t height) override;
             //! Used to fire a notification when our window DPI changes.
             void OnDpiScaleFactorChanged(float dpiScaleFactor) override;
-            //! Used to fire a notification when our vsync interval changes.
-            void OnVsyncIntervalChanged(uint32_t interval) override;
-            //! Used to fire a notification when our refresh rate changes.
-            void OnRefreshRateChanged(uint32_t refreshRate) override;
 
             using SizeChangedEvent = AZ::Event<AzFramework::WindowSize>;
             //! Notifies consumers when the viewport size has changed.
@@ -119,12 +98,6 @@ namespace AZ
             //! Alternatively, connect to ViewportContextNotificationsBus and listen to ViewportContextNotifications::OnViewportDpiScalingChanged.
             void ConnectDpiScalingFactorChangedHandler(ScalarChangedEvent::Handler& handler);
 
-            using UintChangedEvent = AZ::Event<uint32_t>;
-            //! Notifies consumers when the vsync interval has changed.
-            void ConnectVsyncIntervalChangedHandler(UintChangedEvent::Handler& handler);
-            //! Notifies consumers when the refresh rate has changed.
-            void ConnectRefreshRateChangedHandler(UintChangedEvent::Handler& handler);
-
             using MatrixChangedEvent = AZ::Event<const AZ::Matrix4x4&>;
             //! Notifies consumers when the view matrix has changed.
             void ConnectViewMatrixChangedHandler(MatrixChangedEvent::Handler& handler);
@@ -166,24 +139,15 @@ namespace AZ
             void SetDefaultView(ViewPtr view);
             // Ensures our render pipeline's default camera matches ours.
             void UpdatePipelineView();
-            // Ensures our render pipeline refresh rate matches our refresh rate.
-            void UpdatePipelineRefreshRate();
-            // Resets the current pipeline reference and ensures pipeline events are disconnected.
-            void ResetCurrentPipeline();
 
             ScenePtr m_rootScene;
             WindowContextSharedPtr m_windowContext;
             ViewPtr m_defaultView;
             AzFramework::WindowSize m_viewportSize;
             float m_viewportDpiScaleFactor = 1.0f;
-            uint32_t m_vsyncInterval = 1;
-            uint32_t m_refreshRate = 60;
-            float m_fpsLimit = 0.f;
 
             SizeChangedEvent m_sizeChangedEvent;
             ScalarChangedEvent m_dpiScalingFactorChangedEvent;
-            UintChangedEvent m_vsyncIntervalChangedEvent;
-            UintChangedEvent m_refreshRateChangedEvent;
             MatrixChangedEvent m_viewMatrixChangedEvent;
             MatrixChangedEvent::Handler m_onViewMatrixChangedHandler;
             MatrixChangedEvent m_projectionMatrixChangedEvent;
@@ -193,9 +157,6 @@ namespace AZ
             ViewChangedEvent m_defaultViewChangedEvent;
             ViewportIdEvent m_aboutToBeDestroyedEvent;
 
-            AZ::Event<>::Handler m_prepareFrameHandler;
-            AZ::Event<>::Handler m_endFrameHandler;
-
             ViewportContextManager* m_manager;
             RenderPipelinePtr m_currentPipeline;
             Name m_name;

Gems/Atom/RPI/Code/Include/Atom/RPI.Public/ViewportContextBus.h

@@ -110,13 +110,11 @@ namespace AZ
             virtual void OnViewportSizeChanged(AzFramework::WindowSize size){AZ_UNUSED(size);}
             //! Called when the window DPI scaling changes for a given viewport context.
             virtual void OnViewportDpiScalingChanged(float dpiScale){AZ_UNUSED(dpiScale);}
-            //! Called when the active view changes for a given viewport context.
+            //! Called when the active view for a given viewport context name changes.
             virtual void OnViewportDefaultViewChanged(AZ::RPI::ViewPtr view){AZ_UNUSED(view);}
             //! Called when the viewport is to be rendered.
-            //! Add draws to this function if they only need to be rendered to this viewport. 
+            //! Add draws to this functions if they only need to be rendered to this viewport. 
-            virtual void OnRenderTick(){}
+            virtual void OnRenderTick(){};
-            //! Called when the viewport finishes rendering a frame.
-            virtual void OnFrameEnd(){}
 
         protected:
             ~ViewportContextNotifications() = default;

Gems/Atom/RPI/Code/Source/RPI.Private/RPISystemComponent.cpp

@@ -14,9 +14,6 @@
 #include <RPI.Private/RPISystemComponent.h>
 
 #include <Atom/RHI/Factory.h>
-#include <Atom/RPI.Public/ViewportContextBus.h>
-#include <Atom/RPI.Public/ViewportContext.h>
-#include <Atom/RPI.Public/RenderPipeline.h>
 
 #include <AzCore/Asset/AssetManager.h>
 #include <AzCore/IO/IOUtils.h>
@@ -96,29 +93,20 @@ namespace AZ
             }
 
             m_rpiSystem.Initialize(m_rpiDescriptor);
-            AZ::TickBus::Handler::BusConnect();
+            AZ::SystemTickBus::Handler::BusConnect();
         }
 
         void RPISystemComponent::Deactivate()
         {
-            AZ::TickBus::Handler::BusDisconnect();
+            AZ::SystemTickBus::Handler::BusDisconnect();
             m_rpiSystem.Shutdown();
         }
 
-        void RPISystemComponent::OnTick([[maybe_unused]]float deltaTime, [[maybe_unused]]ScriptTimePoint time)
+        void RPISystemComponent::OnSystemTick()
         {
-            if (deltaTime == 0.f)
-            {
-                return;
-            }
-
             m_rpiSystem.SimulationTick();
             m_rpiSystem.RenderTick();
         }
 
-        int RPISystemComponent::GetTickOrder()
-        {
-            return AZ::ComponentTickBus::TICK_RENDER;
-        }
     } // namespace RPI
 } // namespace AZ

Gems/Atom/RPI/Code/Source/RPI.Private/RPISystemComponent.h

@@ -32,7 +32,7 @@ namespace AZ
          */
         class RPISystemComponent final
             : public AZ::Component
-            , private AZ::TickBus::Handler
+            , public AZ::SystemTickBus::Handler
         {
         public:
             AZ_COMPONENT(RPISystemComponent, "{83E301F3-7A0C-4099-B530-9342B91B1BC0}");
@@ -50,9 +50,8 @@ namespace AZ
         private:
             RPISystemComponent(const RPISystemComponent&) = delete;
 
-            // TickBus overrides...
+            // SystemTickBus overrides...
-            void OnTick(float deltaTime, ScriptTimePoint time) override;
+            void OnSystemTick() override;
-            int GetTickOrder() override;
 
             RPISystem m_rpiSystem;
 

Gems/Atom/RPI/Code/Source/RPI.Public/Pass/Pass.cpp

@@ -92,13 +92,10 @@ namespace AZ
         // --- Enable/Disable ---
 
         void Pass::SetEnabled(bool enabled)
-        {
-            if (m_flags.m_enabled != enabled)
         {
             m_flags.m_enabled = enabled;
             OnHierarchyChange();
         }
-        }
 
         bool Pass::IsEnabled() const
         {

Gems/Atom/RPI/Code/Source/RPI.Public/RenderPipeline.cpp

@@ -301,26 +301,6 @@ namespace AZ
             m_drawFilterMask = 0;
         }
 
-        void RenderPipeline::OnPrepareFrame()
-        {
-            m_lastRenderRequestTime = AZStd::chrono::system_clock::now();
-
-            // If we're attempting to render at a target interval, check to see if we're within
-            // 1ms of that interval, enabling rendering only if we are.
-            if (m_renderMode == RenderMode::RenderAtTargetRate)
-            {
-                constexpr AZStd::chrono::duration<float> updateThresholdMs(0.001f);
-                const bool shouldRender =
-                    m_lastRenderRequestTime - m_lastRenderStartTime + updateThresholdMs >= m_targetRefreshRate;
-                m_rootPass->SetEnabled(shouldRender);
-            }
-
-            if (NeedsRender())
-            {
-                m_prepareFrameEvent.Signal();
-            }
-        }
-
         void RenderPipeline::OnPassModified()
         {
             if (m_needsPassRecreate)
@@ -395,11 +375,11 @@ namespace AZ
             m_scene->RemoveRenderPipeline(m_nameId);
         }
 
-        void RenderPipeline::OnStartFrame()
+        void RenderPipeline::OnStartFrame(const TickTimeInfo& tick)
         {
             AZ_PROFILE_SCOPE(RPI, "RenderPipeline: OnStartFrame");
 
-            m_lastRenderStartTime = m_lastRenderRequestTime;
+            m_lastRenderStartTime = tick.m_currentGameTime;
 
             OnPassModified();
 
@@ -427,7 +407,6 @@ namespace AZ
             {
                 RemoveFromRenderTick();
             }
-            m_endFrameEvent.Signal();
         }
 
         void RenderPipeline::CollectPersistentViews(AZStd::map<ViewPtr, RHI::DrawListMask>& outViewMasks) const
@@ -510,13 +489,6 @@ namespace AZ
             m_renderMode = RenderMode::RenderEveryTick;
         }
 
-        void RenderPipeline::AddToRenderTickAtInterval(AZStd::chrono::duration<float> renderInterval)
-        {
-            m_rootPass->SetEnabled(false);
-            m_renderMode = RenderMode::RenderAtTargetRate;
-            m_targetRefreshRate = renderInterval;
-        }
-
         void RenderPipeline::RemoveFromRenderTick()
         {
             m_renderMode = RenderMode::NoRender;
@@ -530,7 +502,7 @@ namespace AZ
         
         bool RenderPipeline::NeedsRender() const
         {
-            return m_rootPass->IsEnabled();
+            return m_renderMode != RenderMode::NoRender;
         }
 
         RHI::DrawFilterTag RenderPipeline::GetDrawFilterTag() const
@@ -543,16 +515,6 @@ namespace AZ
             return m_drawFilterMask;
         }
 
-        void RenderPipeline::ConnectPrepareFrameHandler(FrameNotificationEvent::Handler& handler)
-        {
-            handler.Connect(m_prepareFrameEvent);
-        }
-
-        void RenderPipeline::ConnectEndFrameHandler(FrameNotificationEvent::Handler& handler)
-        {
-            handler.Connect(m_endFrameEvent);
-        }
-
         void RenderPipeline::SetDrawFilterTag(RHI::DrawFilterTag tag)
         {
             m_drawFilterTag = tag;

Gems/Atom/RPI/Code/Source/RPI.Public/Scene.cpp

@@ -418,7 +418,7 @@ namespace AZ
             }
         }
 
-        void Scene::PrepareRender([[maybe_unused]]const TickTimeInfo& tickInfo, RHI::JobPolicy jobPolicy)
+        void Scene::PrepareRender(const TickTimeInfo& tickInfo, RHI::JobPolicy jobPolicy)
         {
             AZ_PROFILE_SCOPE(RPI, "Scene: PrepareRender");
 
@@ -429,27 +429,20 @@ namespace AZ
 
             SceneNotificationBus::Event(GetId(), &SceneNotification::OnBeginPrepareRender);
 
-            // Get active pipelines which need to be rendered and notify them of an impending frame.
+            // Get active pipelines which need to be rendered and notify them frame started
             AZStd::vector<RenderPipelinePtr> activePipelines;
             {
-                AZ_PROFILE_SCOPE(RPI, "Scene: OnPrepareFrame");
+                AZ_PROFILE_SCOPE(RPI, "Scene: OnStartFrame");
                 for (auto& pipeline : m_pipelines)
                 {
-                    pipeline->OnPrepareFrame();
                     if (pipeline->NeedsRender())
                     {
                         activePipelines.push_back(pipeline);
+                        pipeline->OnStartFrame(tickInfo);
                     }
                 }
             }
 
-            // Get active pipelines which need to be rendered and notify them frame started
-            for (const auto& pipeline : activePipelines)
-            {
-                AZ_PROFILE_SCOPE(RPI, "Scene: OnStartFrame");
-                pipeline->OnStartFrame();
-            }
-
             // Return if there is no active render pipeline
             if (activePipelines.empty())
             {
@@ -589,12 +582,10 @@ namespace AZ
         void Scene::OnFrameEnd()
         {
             AZ_PROFILE_SCOPE(RPI, "Scene: OnFrameEnd");
-            bool didRender = false;
             for (auto& pipeline : m_pipelines)
             {
                 if (pipeline->NeedsRender())
                 {
-                    didRender = true;
                     pipeline->OnFrameEnd();
                 }
             }
@@ -602,10 +593,6 @@ namespace AZ
             {
                 fp->OnRenderEnd();
             }
-            if (didRender)
-            {
-                SceneNotificationBus::Event(GetId(), &SceneNotification::OnFrameEnd);
-            }
         }
 
         void Scene::UpdateSrgs()

Gems/Atom/RPI/Code/Source/RPI.Public/View.cpp

@@ -241,11 +241,8 @@ namespace AZ
         {
             AZ_PROFILE_SCOPE(RPI, "View: FinalizeDrawLists");
             m_drawListContext.FinalizeLists();
-            if (m_passesByDrawList)
-            {
             SortFinalizedDrawLists();
         }
-        }
 
         void View::SortFinalizedDrawLists()
         {

Gems/Atom/RPI/Code/Source/RPI.Public/ViewportContext.cpp

@@ -25,13 +25,14 @@ namespace AZ
             , m_viewportSize(1, 1)
         {
             m_windowContext->Initialize(device, nativeWindow);
-            AzFramework::WindowRequestBus::Event(nativeWindow, [this](AzFramework::WindowRequestBus::Events* window)
+            AzFramework::WindowRequestBus::EventResult(
-            {
+                m_viewportSize,
-                m_viewportSize = window->GetClientAreaSize();
+                nativeWindow,
-                m_viewportDpiScaleFactor = window->GetDpiScaleFactor();
+                &AzFramework::WindowRequestBus::Events::GetClientAreaSize);
-                m_vsyncInterval = window->GetSyncInterval();
+            AzFramework::WindowRequestBus::EventResult(
-                m_refreshRate = window->GetDisplayRefreshRate();
+                m_viewportDpiScaleFactor,
-            });
+                nativeWindow,
+                &AzFramework::WindowRequestBus::Events::GetDpiScaleFactor);
             AzFramework::WindowNotificationBus::Handler::BusConnect(nativeWindow);
             AzFramework::ViewportRequestBus::Handler::BusConnect(id);
 
@@ -45,20 +46,6 @@ namespace AZ
                 m_viewMatrixChangedEvent.Signal(matrix);
             });
 
-            m_prepareFrameHandler = RenderPipeline::FrameNotificationEvent::Handler(
-                [this]()
-                {
-                    ViewportContextNotificationBus::Event(GetName(), &ViewportContextNotificationBus::Events::OnRenderTick);
-                    ViewportContextIdNotificationBus::Event(GetId(), &ViewportContextIdNotificationBus::Events::OnRenderTick);
-                });
-
-            m_endFrameHandler = RenderPipeline::FrameNotificationEvent::Handler(
-                [this]()
-                {
-                    ViewportContextNotificationBus::Event(GetName(), &ViewportContextNotificationBus::Events::OnFrameEnd);
-                    ViewportContextIdNotificationBus::Event(GetId(), &ViewportContextIdNotificationBus::Events::OnFrameEnd);
-                });
-
             SetRenderScene(renderScene);
         }
 
@@ -124,38 +111,26 @@ namespace AZ
                 {
                     SceneNotificationBus::Handler::BusConnect(m_rootScene->GetId());
                 }
-                ResetCurrentPipeline();
+                m_currentPipeline.reset();
                 UpdatePipelineView();
-                UpdatePipelineRefreshRate();
             }
 
             m_sceneChangedEvent.Signal(scene);
         }
 
-        float ViewportContext::GetFpsLimit() const
+        void ViewportContext::RenderTick()
         {
-            return m_fpsLimit;
+            // add the current pipeline to next render tick if it's not already added.
-        }
+            if (m_currentPipeline && m_currentPipeline->GetRenderMode() != RenderPipeline::RenderMode::RenderOnce)
-
-        void ViewportContext::SetFpsLimit(float fpsLimit)
             {
-            m_fpsLimit = fpsLimit;
+                m_currentPipeline->AddToRenderTickOnce();
-            UpdatePipelineRefreshRate();
+            }
         }
 
-        float ViewportContext::GetTargetFrameRate() const
+        void ViewportContext::OnBeginPrepareRender()
-        {
-            float targetFrameRate = GetFpsLimit();
-            const AZ::u32 vsyncInterval = GetVsyncInterval();
-            if (vsyncInterval != 0)
-            {
-                const float vsyncFrameRate = static_cast<float>(GetRefreshRate()) / static_cast<float>(vsyncInterval);
-                if (targetFrameRate == 0.f || vsyncFrameRate < targetFrameRate)
         {
-                    targetFrameRate = vsyncFrameRate;
+            ViewportContextNotificationBus::Event(GetName(), &ViewportContextNotificationBus::Events::OnRenderTick);
-                }
+            ViewportContextIdNotificationBus::Event(GetId(), &ViewportContextIdNotificationBus::Events::OnRenderTick);
-            }
-            return targetFrameRate;
         }
 
         AZ::Name ViewportContext::GetName() const
@@ -183,16 +158,6 @@ namespace AZ
             return m_viewportDpiScaleFactor;
         }
 
-        uint32_t ViewportContext::GetVsyncInterval() const
-        {
-            return m_vsyncInterval;
-        }
-
-        uint32_t ViewportContext::GetRefreshRate() const
-        {
-            return m_refreshRate;
-        }
-
         void ViewportContext::ConnectSizeChangedHandler(SizeChangedEvent::Handler& handler)
         {
             handler.Connect(m_sizeChangedEvent);
@@ -203,16 +168,6 @@ namespace AZ
             handler.Connect(m_dpiScalingFactorChangedEvent);
         }
 
-        void ViewportContext::ConnectVsyncIntervalChangedHandler(UintChangedEvent::Handler& handler)
-        {
-            handler.Connect(m_vsyncIntervalChangedEvent);
-        }
-
-        void ViewportContext::ConnectRefreshRateChangedHandler(UintChangedEvent::Handler& handler)
-        {
-            handler.Connect(m_refreshRateChangedEvent);
-        }
-
         void ViewportContext::ConnectViewMatrixChangedHandler(MatrixChangedEvent::Handler& handler)
         {
             handler.Connect(m_viewMatrixChangedEvent);
@@ -308,43 +263,12 @@ namespace AZ
                 m_currentPipelineChangedEvent.Signal(m_currentPipeline);
             }
 
-            if (m_currentPipeline)
+            if (auto pipeline = GetCurrentPipeline())
-            {
-                if (!m_prepareFrameHandler.IsConnected())
-                {
-                    m_currentPipeline->ConnectPrepareFrameHandler(m_prepareFrameHandler);
-                    m_currentPipeline->ConnectEndFrameHandler(m_endFrameHandler);
-                }
-                m_currentPipeline->SetDefaultView(m_defaultView);
-            }
-        }
-
-        void ViewportContext::UpdatePipelineRefreshRate()
-        {
-            if (!m_currentPipeline)
-            {
-                return;
-            }
-
-            const float refreshRate = GetTargetFrameRate();
-            // If we have a truly unlimited framerate, just render every tick
-            if (refreshRate == 0.f)
-            {
-                m_currentPipeline->AddToRenderTick();
-            }
-            else
             {
-                m_currentPipeline->AddToRenderTickAtInterval(AZStd::chrono::duration<float>(1.f / refreshRate));
+                pipeline->SetDefaultView(m_defaultView);
             }
         }
 
-        void ViewportContext::ResetCurrentPipeline()
-        {
-            m_prepareFrameHandler.Disconnect();
-            m_endFrameHandler.Disconnect();
-            m_currentPipeline.reset();
-        }
-
         RenderPipelinePtr ViewportContext::GetCurrentPipeline()
         {
             return m_currentPipeline;
@@ -357,9 +281,8 @@ namespace AZ
             // in the event prioritization is added later
             if (pipeline->GetWindowHandle() == m_windowContext->GetWindowHandle())
             {
-                ResetCurrentPipeline();
+                m_currentPipeline.reset();
                 UpdatePipelineView();
-                UpdatePipelineRefreshRate();
             }
         }
 
@@ -367,9 +290,8 @@ namespace AZ
         {
             if (m_currentPipeline.get() == pipeline)
             {
-                ResetCurrentPipeline();
+                m_currentPipeline.reset();
                 UpdatePipelineView();
-                UpdatePipelineRefreshRate();
             }
         }
 
@@ -383,30 +305,10 @@ namespace AZ
             }
         }
 
-        void ViewportContext::OnRefreshRateChanged(uint32_t refreshRate)
-        {
-            if (m_refreshRate != refreshRate)
-            {
-                m_refreshRate = refreshRate;
-                m_refreshRateChangedEvent.Signal(m_refreshRate);
-                UpdatePipelineRefreshRate();
-            }
-        }
-
         void ViewportContext::OnDpiScaleFactorChanged(float dpiScaleFactor)
         {
             m_viewportDpiScaleFactor = dpiScaleFactor;
             m_dpiScalingFactorChangedEvent.Signal(dpiScaleFactor);
         }
-
-        void ViewportContext::OnVsyncIntervalChanged(uint32_t interval)
-        {
-            if (m_vsyncInterval != interval)
-            {
-                m_vsyncInterval = interval;
-                m_vsyncIntervalChangedEvent.Signal(m_vsyncInterval);
-                UpdatePipelineRefreshRate();
-            }
-        }
     } // namespace RPI
 } // namespace AZ

Gems/Atom/Tools/AtomToolsFramework/Code/Include/AtomToolsFramework/Viewport/RenderViewportWidget.h

@@ -10,7 +10,6 @@
 
 #include <QWidget>
 #include <QElapsedTimer>
-#include <QPointer>
 #include <Atom/RPI.Public/Base.h>
 #include <AzToolsFramework/Viewport/ViewportMessages.h>
 #include <AzToolsFramework/Input/QtEventToAzInputManager.h>
@@ -22,8 +21,6 @@
 #include <AzFramework/Windowing/WindowBus.h>
 #include <AzCore/Component/TickBus.h>
 #include <Atom/RPI.Public/AuxGeom/AuxGeomFeatureProcessorInterface.h>
-#include <Atom/Bootstrap/BootstrapNotificationBus.h>
-#include <AtomToolsFramework/Viewport/RenderViewportWidgetNotificationBus.h>
 
 namespace AtomToolsFramework
 {
@@ -38,8 +35,6 @@ namespace AtomToolsFramework
         , public AzFramework::WindowRequestBus::Handler
         , protected AzFramework::InputChannelEventListener
         , protected AZ::TickBus::Handler
-        , protected AZ::Render::Bootstrap::NotificationBus::Handler
-        , protected AtomToolsFramework::RenderViewportWidgetNotificationBus::Handler
     {
     public:
         //! Creates a RenderViewportWidget.
@@ -126,7 +121,6 @@ namespace AtomToolsFramework
 
         // AZ::TickBus::Handler ...
         void OnTick(float deltaTime, AZ::ScriptTimePoint time) override;
-        int GetTickOrder() override;
 
         // QWidget ...
         void resizeEvent(QResizeEvent *event) override;
@@ -134,21 +128,9 @@ namespace AtomToolsFramework
         void enterEvent(QEvent* event) override;
         void leaveEvent(QEvent* event) override;
         void mouseMoveEvent(QMouseEvent* event) override;
-        void focusInEvent(QFocusEvent* event) override;
-
-        // AZ::Render::Bootstrap::NotificationBus::Handler ...
-        void OnFrameRateLimitChanged(float fpsLimit) override;
-
-        // AtomToolsFramework::RenderViewportWidgetNotificationBus::Handler ...
-        void OnInactiveViewportFrameRateChanged(float fpsLimit) override;
 
     private:
-        AzFramework::NativeWindowHandle GetNativeWindowHandle() const;
-        void UpdateFrameRate();
-
-        void SetScreen(QScreen* screen);
         void SendWindowResizeEvent();
-        void NotifyUpdateRefreshRate();
 
         // The underlying ViewportContext, our entry-point to the Atom RPI.
         AZ::RPI::ViewportContextPtr m_viewportContext;
@@ -169,11 +151,5 @@ namespace AtomToolsFramework
         AZ::ScriptTimePoint m_time;
         // Maps our internal Qt events into AzFramework InputChannels for our ViewportControllerList.
         AzToolsFramework::QtEventToAzInputMapper* m_inputChannelMapper = nullptr;
-        // Stores our current screen, used for tracking the current refresh rate.
-        QScreen* m_screen = nullptr;
-        // Stores the last RenderViewportWidget that has received user focus.
-        // This is used for optional framerate throtting for "inactive" viewports via the
-        // ed_inactive_viewport_fps_limit CVAR.
-        AZ::EnvironmentVariable<RenderViewportWidget*> m_lastFocusedViewport;
     };
 } //namespace AtomToolsFramework

Gems/Atom/Tools/AtomToolsFramework/Code/Include/AtomToolsFramework/Viewport/RenderViewportWidgetNotificationBus.h

@@ -1,35 +0,0 @@
-/*
- * Copyright (c) Contributors to the Open 3D Engine Project.
- * For complete copyright and license terms please see the LICENSE at the root of this distribution.
- *
- * SPDX-License-Identifier: Apache-2.0 OR MIT
- *
- */
-
-#pragma once
-
-#include <AzCore/EBus/EBus.h>
-
-namespace AtomToolsFramework
-{
-    //! Provides an interface for providing notifications specific to RenderViewportWidget.
-    //! @note Most behaviors in RenderViewportWidget are handled by its underyling
-    //! ViewportContext, this bus is specifically for functionality exclusive to the
-    //! Qt layer provided by RenderViewportWidget.
-    class RenderViewportWidgetNotifications : public AZ::EBusTraits
-    {
-    public:
-        static const AZ::EBusAddressPolicy AddressPolicy = AZ::EBusAddressPolicy::Single;
-        static const AZ::EBusHandlerPolicy HandlerPolicy = AZ::EBusHandlerPolicy::Multiple;
-
-        //! Triggered when the idle frame rate limit for inactive viewports changed.
-        //! Controlled by the ed_inactive_viewport_fps_limit CVAR.
-        //! Active viewports are controlled by the r_fps_limit CVAR.
-        virtual void OnInactiveViewportFrameRateChanged([[maybe_unused]]float fpsLimit){}
-
-    protected:
-        ~RenderViewportWidgetNotifications() = default;
-    };
-
-    using RenderViewportWidgetNotificationBus = AZ::EBus<RenderViewportWidgetNotifications>;
-} // namespace AtomToolsFramework

Gems/Atom/Tools/AtomToolsFramework/Code/Source/Viewport/RenderViewportWidget.cpp

@@ -6,42 +6,23 @@
  *
  */
 
-#include <Atom/Bootstrap/BootstrapRequestBus.h>
+#include <AtomToolsFramework/Viewport/RenderViewportWidget.h>
-#include <Atom/RHI/RHISystemInterface.h>
-#include <Atom/RPI.Public/View.h>
 #include <Atom/RPI.Public/ViewportContext.h>
 #include <Atom/RPI.Public/ViewportContextBus.h>
-#include <AtomToolsFramework/Viewport/RenderViewportWidget.h>
+#include <Atom/RPI.Public/View.h>
-#include <AzCore/Console/Console.h>
-#include <AzCore/Math/MathUtils.h>
 #include <AzFramework/Input/Devices/Mouse/InputDeviceMouse.h>
 #include <AzFramework/Viewport/ViewportControllerList.h>
 #include <AzFramework/Viewport/ViewportScreen.h>
 #include <AzToolsFramework/Viewport/ViewportTypes.h>
+#include <AzCore/Math/MathUtils.h>
+#include <Atom/RHI/RHISystemInterface.h>
+#include <Atom/Bootstrap/BootstrapRequestBus.h>
 
 #include <QApplication>
-#include <QBoxLayout>
 #include <QCursor>
-#include <QMouseEvent>
+#include <QBoxLayout>
-#include <QScreen>
-#include <QTimer>
 #include <QWindow>
-
+#include <QMouseEvent>
-static void OnInactiveViewportFrameRateChanged(const float& fpsLimit)
-{
-    AtomToolsFramework::RenderViewportWidgetNotificationBus::Broadcast(
-        &AtomToolsFramework::RenderViewportWidgetNotificationBus::Events::OnInactiveViewportFrameRateChanged, fpsLimit);
-}
-
-AZ_CVAR(
-    float,
-    ed_inactive_viewport_fps_limit,
-    0,
-    OnInactiveViewportFrameRateChanged,
-    AZ::ConsoleFunctorFlags::Null,
-    "The maximum framerate to render viewports that don't have focus at");
-
-static constexpr const char* LastFocusedViewportVariableName = "AtomToolsFramework::RenderViewportWidget::LastFocusedViewport";
 
 namespace AtomToolsFramework
 {
@@ -49,12 +30,6 @@ namespace AtomToolsFramework
         : QWidget(parent)
         , AzFramework::InputChannelEventListener(AzFramework::InputChannelEventListener::GetPriorityDefault())
     {
-        m_lastFocusedViewport = AZ::Environment::FindVariable<RenderViewportWidget*>(LastFocusedViewportVariableName);
-        if (!m_lastFocusedViewport)
-        {
-            m_lastFocusedViewport = AZ::Environment::CreateVariable<RenderViewportWidget*>(LastFocusedViewportVariableName, nullptr);
-        }
-
         if (shouldInitializeViewportContext)
         {
             InitializeViewportContext();
@@ -63,24 +38,13 @@ namespace AtomToolsFramework
         setUpdatesEnabled(false);
         setFocusPolicy(Qt::FocusPolicy::WheelFocus);
         setMouseTracking(true);
-
-        // Wait a frame for our window handle to be constructed, then wire up our screen change signals.
-        QTimer::singleShot(
-            0,
-            [this]()
-            {
-                QObject::connect(windowHandle(), &QWindow::screenChanged, this, &RenderViewportWidget::SetScreen);
-            });
-        SetScreen(screen());
     }
 
     bool RenderViewportWidget::InitializeViewportContext(AzFramework::ViewportId id)
     {
         if (m_viewportContext != nullptr)
         {
-            AZ_Assert(
+            AZ_Assert(id == AzFramework::InvalidViewportId || m_viewportContext->GetId() == id, "Attempted to reinitialize RenderViewportWidget with a different ID");
-                id == AzFramework::InvalidViewportId || m_viewportContext->GetId() == id,
-                "Attempted to reinitialize RenderViewportWidget with a different ID");
             return true;
         }
 
@@ -95,7 +59,7 @@ namespace AtomToolsFramework
         // Before we do anything else, we must create a ViewportContext which will give us a ViewportId if we didn't manually specify one.
         AZ::RPI::ViewportContextRequestsInterface::CreationParameters params;
         params.device = AZ::RHI::RHISystemInterface::Get()->GetDevice();
-        params.windowHandle = GetNativeWindowHandle();
+        params.windowHandle = reinterpret_cast<AzFramework::NativeWindowHandle>(winId());
         params.id = id;
         AzFramework::WindowRequestBus::Handler::BusConnect(params.windowHandle);
         m_viewportContext = viewportContextManager->CreateViewportContext(AZ::Name(), params);
@@ -116,19 +80,15 @@ namespace AtomToolsFramework
         AzFramework::InputChannelEventListener::Connect();
         AZ::TickBus::Handler::BusConnect();
         AzFramework::WindowRequestBus::Handler::BusConnect(params.windowHandle);
-        AZ::Render::Bootstrap::NotificationBus::Handler::BusConnect();
-        AtomToolsFramework::RenderViewportWidgetNotificationBus::Handler::BusConnect();
 
         m_inputChannelMapper = new AzToolsFramework::QtEventToAzInputMapper(this, id);
 
         // Forward input events to our controller list.
-        QObject::connect(
+        QObject::connect(m_inputChannelMapper, &AzToolsFramework::QtEventToAzInputMapper::InputChannelUpdated, this,
-            m_inputChannelMapper, &AzToolsFramework::QtEventToAzInputMapper::InputChannelUpdated, this,
             [this](const AzFramework::InputChannel* inputChannel, QEvent* event)
         {
-                const AzFramework::NativeWindowHandle windowId = GetNativeWindowHandle();
+            AzFramework::NativeWindowHandle windowId = reinterpret_cast<AzFramework::NativeWindowHandle>(winId());
-                if (m_controllerList->HandleInputChannelEvent(
+            if (m_controllerList->HandleInputChannelEvent(AzFramework::ViewportControllerInputEvent{GetId(), windowId, *inputChannel}))
-                        AzFramework::ViewportControllerInputEvent{ GetId(), windowId, *inputChannel }))
             {
                 // If the controller handled the input event, mark the event as accepted so it doesn't continue to propagate.
                 if (event)
@@ -138,24 +98,11 @@ namespace AtomToolsFramework
             }
         });
 
-        // Update our target frame rate. If we're the only viewport, become active.
-        if (m_lastFocusedViewport.Get() == nullptr)
-        {
-            m_lastFocusedViewport.Set(this);
-        }
-        UpdateFrameRate();
-
-
         return true;
     }
 
     RenderViewportWidget::~RenderViewportWidget()
     {
-        if (m_lastFocusedViewport.Get() == this)
-        {
-            m_lastFocusedViewport.Set(nullptr);
-        }
-
         AzFramework::WindowRequestBus::Handler::BusDisconnect();
         AZ::TickBus::Handler::BusDisconnect();
         AzFramework::InputChannelEventListener::Disconnect();
@@ -234,10 +181,10 @@ namespace AtomToolsFramework
 
         bool shouldConsumeEvent = true;
 
-        const bool eventHandled = m_controllerList->HandleInputChannelEvent({ GetId(), GetNativeWindowHandle(), inputChannel });
+        AzFramework::NativeWindowHandle windowId = reinterpret_cast<AzFramework::NativeWindowHandle>(winId());
+        const bool eventHandled = m_controllerList->HandleInputChannelEvent({GetId(), windowId, inputChannel});
 
-        // If our controllers handled the event and it's one we can safely consume (i.e. it's not an Ended event that other viewports might
+        // If our controllers handled the event and it's one we can safely consume (i.e. it's not an Ended event that other viewports might need), consume it.
-        // need), consume it.
         return eventHandled && shouldConsumeEvent;
     }
 
@@ -247,11 +194,6 @@ namespace AtomToolsFramework
         m_controllerList->UpdateViewport({GetId(), AzFramework::FloatSeconds(deltaTime), m_time});
     }
 
-    int RenderViewportWidget::GetTickOrder()
-    {
-        return AZ::ComponentTickBus::TICK_PRE_RENDER;
-    }
-
     void RenderViewportWidget::resizeEvent([[maybe_unused]] QResizeEvent* event)
     {
         SendWindowResizeEvent();
@@ -277,75 +219,6 @@ namespace AtomToolsFramework
         m_mousePosition = event->localPos();
     }
 
-    void RenderViewportWidget::focusInEvent([[maybe_unused]] QFocusEvent* event)
-    {
-        RenderViewportWidget* lastFocusedViewport = m_lastFocusedViewport.Get();
-        if (lastFocusedViewport == this)
-        {
-            return;
-        }
-
-        RenderViewportWidget* previousFocusWidget = lastFocusedViewport;
-        m_lastFocusedViewport.Set(this);
-
-        // Ensure this viewport and whatever viewport last had focus (if any) respect
-        // the active / inactive viewport frame rate settings.
-        UpdateFrameRate();
-        if (previousFocusWidget != nullptr)
-        {
-            previousFocusWidget->UpdateFrameRate();
-        }
-    }
-
-    void RenderViewportWidget::OnFrameRateLimitChanged([[maybe_unused]] float fpsLimit)
-    {
-        UpdateFrameRate();
-    }
-
-    void RenderViewportWidget::OnInactiveViewportFrameRateChanged([[maybe_unused]] float fpsLimit)
-    {
-        UpdateFrameRate();
-    }
-
-    AzFramework::NativeWindowHandle RenderViewportWidget::GetNativeWindowHandle() const
-    {
-        return reinterpret_cast<AzFramework::NativeWindowHandle>(winId());
-    }
-
-    void RenderViewportWidget::UpdateFrameRate()
-    {
-        if (ed_inactive_viewport_fps_limit > 0.f && m_lastFocusedViewport.Get() != this)
-        {
-            m_viewportContext->SetFpsLimit(ed_inactive_viewport_fps_limit);
-        }
-        else
-        {
-            float fpsLimit = 0.f;
-            AZ::Render::Bootstrap::RequestBus::BroadcastResult(fpsLimit, &AZ::Render::Bootstrap::RequestBus::Events::GetFrameRateLimit);
-            m_viewportContext->SetFpsLimit(fpsLimit);
-        }
-    }
-
-    void RenderViewportWidget::SetScreen(QScreen* screen)
-    {
-        if (m_screen != screen)
-        {
-            if (m_screen)
-            {
-                QObject::disconnect(m_screen, &QScreen::refreshRateChanged, this, &RenderViewportWidget::NotifyUpdateRefreshRate);
-            }
-
-            if (screen)
-            {
-                QObject::connect(m_screen, &QScreen::refreshRateChanged, this, &RenderViewportWidget::NotifyUpdateRefreshRate);
-            }
-
-            NotifyUpdateRefreshRate();
-
-            m_screen = screen;
-        }
-    }
-
     void RenderViewportWidget::SendWindowResizeEvent()
     {
         // Scale the size by the DPI of the platform to
@@ -353,14 +226,8 @@ namespace AtomToolsFramework
         const QSize uiWindowSize = size();
         const QSize windowSize = uiWindowSize * devicePixelRatioF();
 
-        AzFramework::WindowNotificationBus::Event(
+        const AzFramework::NativeWindowHandle windowId = reinterpret_cast<AzFramework::NativeWindowHandle>(winId());
-            GetNativeWindowHandle(), &AzFramework::WindowNotifications::OnWindowResized, windowSize.width(), windowSize.height());
+        AzFramework::WindowNotificationBus::Event(windowId, &AzFramework::WindowNotifications::OnWindowResized, windowSize.width(), windowSize.height());
-    }
-
-    void RenderViewportWidget::NotifyUpdateRefreshRate()
-    {
-        AzFramework::WindowNotificationBus::Event(
-            GetNativeWindowHandle(), &AzFramework::WindowNotificationBus::Events::OnRefreshRateChanged, GetDisplayRefreshRate());
     }
 
     AZ::Name RenderViewportWidget::GetCurrentContextName() const
@@ -418,7 +285,9 @@ namespace AtomToolsFramework
 
         // Build camera state from Atom camera transforms
         AzFramework::CameraState cameraState = AzFramework::CreateCameraFromWorldFromViewMatrix(
-            currentView->GetViewToWorldMatrix(), AZ::Vector2{ aznumeric_cast<float>(width()), aznumeric_cast<float>(height()) });
+            currentView->GetViewToWorldMatrix(),
+            AZ::Vector2{aznumeric_cast<float>(width()), aznumeric_cast<float>(height())}
+        );
         AzFramework::SetCameraClippingVolumeFromPerspectiveFovMatrixRH(cameraState, currentView->GetViewToClipMatrix());
 
         // Convert from Z-up
@@ -430,7 +299,8 @@ namespace AtomToolsFramework
 
     AzFramework::ScreenPoint RenderViewportWidget::ViewportWorldToScreen(const AZ::Vector3& worldPosition)
     {
-        if (AZ::RPI::ViewPtr currentView = m_viewportContext->GetDefaultView(); currentView == nullptr)
+        if (AZ::RPI::ViewPtr currentView = m_viewportContext->GetDefaultView();
+            currentView == nullptr)
         {
             return AzFramework::ScreenPoint(0, 0);
         }
@@ -443,10 +313,12 @@ namespace AtomToolsFramework
         const auto& cameraProjection = m_viewportContext->GetCameraProjectionMatrix();
         const auto& cameraView = m_viewportContext->GetCameraViewMatrix();
 
-        const AZ::Vector4 normalizedScreenPosition{ screenPosition.m_x * 2.f / width() - 1.0f,
+        const AZ::Vector4 normalizedScreenPosition {
+            screenPosition.m_x * 2.f / width() - 1.0f,
             (height() - screenPosition.m_y) * 2.f / height() - 1.0f,
             1.f - depth, // [GFX TODO] [ATOM-1501] Currently we always assume reverse depth
-                                                    1.f };
+            1.f
+        };
 
         AZ::Matrix4x4 worldFromScreen = cameraProjection * cameraView;
         worldFromScreen.InvertFull();
@@ -543,20 +415,11 @@ namespace AtomToolsFramework
 
     uint32_t RenderViewportWidget::GetDisplayRefreshRate() const
     {
-        return static_cast<uint32_t>(screen()->refreshRate());
+        return 60;
     }
 
     uint32_t RenderViewportWidget::GetSyncInterval() const
     {
-        uint32_t interval = 1;
+        return 1;
-
-        // Get vsync_interval from AzFramework::NativeWindow, which owns it.
-        // NativeWindow also handles broadcasting OnVsyncIntervalChanged to all
-        // WindowNotificationBus listeners.
-        if (auto console = AZ::Interface<AZ::IConsole>::Get())
-        {
-            console->GetCvarValue<uint32_t>("vsync_interval", interval);
-        }
-        return interval;
     }
 } //namespace AtomToolsFramework

Gems/Atom/Tools/AtomToolsFramework/Code/atomtoolsframework_files.cmake

@@ -28,7 +28,6 @@ set(FILES
     Include/AtomToolsFramework/Util/MaterialPropertyUtil.h
     Include/AtomToolsFramework/Util/Util.h
     Include/AtomToolsFramework/Viewport/RenderViewportWidget.h
-    Include/AtomToolsFramework/Viewport/RenderViewportWidgetNotificationBus.h
     Include/AtomToolsFramework/Viewport/ModularViewportCameraController.h
     Include/AtomToolsFramework/Viewport/ModularViewportCameraControllerRequestBus.h
     Include/AtomToolsFramework/Window/AtomToolsMainWindow.h

Gems/AtomLyIntegration/AtomViewportDisplayInfo/Code/Source/AtomViewportDisplayInfoSystemComponent.cpp

@@ -183,15 +183,6 @@ namespace AZ::Render
         DrawFramerate();
     }
 
-    void AtomViewportDisplayInfoSystemComponent::OnFrameEnd()
-    {
-        auto currentTime = AZStd::chrono::system_clock::now();
-        if (!m_fpsHistory.empty())
-        {
-            m_fpsHistory.back().m_endFrameTime = currentTime;
-        }
-    }
-
     AtomBridge::ViewportInfoDisplayState AtomViewportDisplayInfoSystemComponent::GetDisplayState() const
     {
         return aznumeric_cast<AtomBridge::ViewportInfoDisplayState>(r_displayInfo.operator int());
@@ -257,11 +248,11 @@ namespace AZ::Render
     void AtomViewportDisplayInfoSystemComponent::UpdateFramerate()
     {
         auto currentTime = AZStd::chrono::system_clock::now();
-        while (!m_fpsHistory.empty() && (currentTime - m_fpsHistory.front().m_beginFrameTime) > m_fpsInterval)
+        while (!m_fpsHistory.empty() && (currentTime - m_fpsHistory.front()) > m_fpsInterval)
         {
             m_fpsHistory.pop_front();
         }
-        m_fpsHistory.push_back(FrameTimingInfo(currentTime));
+        m_fpsHistory.push_back(currentTime);
     }
 
     void AtomViewportDisplayInfoSystemComponent::DrawFramerate()
@@ -270,31 +261,25 @@ namespace AZ::Render
         double minFPS = DBL_MAX;
         double maxFPS = 0;
         AZStd::chrono::duration<double> deltaTime;
-        AZStd::chrono::milliseconds totalFrameMS(0);
         for (const auto& time : m_fpsHistory)
         {
             if (lastTime.has_value())
             {
-                deltaTime = time.m_beginFrameTime - lastTime.value();
+                deltaTime = time - lastTime.value();
                 double fps = AZStd::chrono::seconds(1) / deltaTime;
                 minFPS = AZStd::min(minFPS, fps);
                 maxFPS = AZStd::max(maxFPS, fps);
             }
-            lastTime = time.m_beginFrameTime;
+            lastTime = time;
-
-            if (time.m_endFrameTime.has_value())
-            {
-                totalFrameMS += time.m_endFrameTime.value() - time.m_beginFrameTime;
-            }
         }
 
         double averageFPS = 0;
         double averageFrameMs = 0;
         if (m_fpsHistory.size() > 1)
         {
-            deltaTime = m_fpsHistory.back().m_beginFrameTime - m_fpsHistory.front().m_beginFrameTime;
+            deltaTime = m_fpsHistory.back() - m_fpsHistory.front();
-            averageFPS = AZStd::chrono::seconds(m_fpsHistory.size() - 1) / deltaTime;
+            averageFPS = AZStd::chrono::seconds(m_fpsHistory.size()) / deltaTime;
-            averageFrameMs = aznumeric_cast<double>(totalFrameMS.count()) / (m_fpsHistory.size() - 1);
+            averageFrameMs = 1000.0f/averageFPS;
         }
 
         const double frameIntervalSeconds = m_fpsInterval.count();
@@ -303,7 +288,7 @@ namespace AZ::Render
             AZStd::string::format(
                 "FPS %.1f [%.0f..%.0f], %.1fms/frame, avg over %.1fs",
                 averageFPS,
-                minFPS == DBL_MAX ? 0.0 : minFPS,
+                minFPS,
                 maxFPS,
                 averageFrameMs,
                 frameIntervalSeconds),

Gems/AtomLyIntegration/AtomViewportDisplayInfo/Code/Source/AtomViewportDisplayInfoSystemComponent.h

@@ -45,7 +45,6 @@ namespace AZ
 
             // AZ::RPI::ViewportContextNotificationBus::Handler overrides...
             void OnRenderTick() override;
-            void OnFrameEnd() override;
 
             // AZ::AtomBridge::AtomViewportInfoDisplayRequestBus::Handler overrides...
             AtomBridge::ViewportInfoDisplayState GetDisplayState() const override;
@@ -62,8 +61,6 @@ namespace AZ
             void DrawPassInfo();
             void DrawFramerate();
 
-            void UpdateScene(AZ::RPI::ScenePtr scene);
-
             static constexpr float BaseFontSize = 0.7f;
 
             AZStd::string m_rendererDescription;
@@ -71,17 +68,7 @@ namespace AZ
             AzFramework::FontDrawInterface* m_fontDrawInterface = nullptr;
             float m_lineSpacing;
             AZStd::chrono::duration<double> m_fpsInterval = AZStd::chrono::seconds(1);
-            struct FrameTimingInfo
+            AZStd::deque<AZStd::chrono::system_clock::time_point> m_fpsHistory;
-            {
-                AZStd::chrono::system_clock::time_point m_beginFrameTime;
-                AZStd::optional<AZStd::chrono::system_clock::time_point> m_endFrameTime;
-
-                explicit FrameTimingInfo(AZStd::chrono::system_clock::time_point beginFrameTime)
-                    : m_beginFrameTime(beginFrameTime)
-                {
-                }
-            };
-            AZStd::deque<FrameTimingInfo> m_fpsHistory;
             AZStd::optional<AZStd::chrono::system_clock::time_point> m_lastMemoryUpdate;
             bool m_updateRootPassQuery = true;
         };