Implement custom rendering framerate for RenderTask

Source/Engine/Graphics/RenderTask.cpp

@@ -14,6 +14,7 @@
 #include "Engine/Renderer/Renderer.h"
 #include "Engine/Render2D/Render2D.h"
 #include "Engine/Engine/Engine.h"
+#include "Engine/Engine/Time.h"
 #include "Engine/Profiler/Profiler.h"
 #include "Engine/Renderer/RenderList.h"
 #include "Engine/Threading/Threading.h"
@@ -71,9 +72,20 @@ RenderTask::~RenderTask()
 
 bool RenderTask::CanDraw() const
 {
-    if (SwapChain && SwapChain->GetWindow() && !SwapChain->GetWindow()->IsVisible() && !SwapChain->GetWindow()->GetSettings().ShowAfterFirstPaint)
+    if (!Enabled)
         return false;
-    return Enabled;
+
+    const Window* window = SwapChain ? SwapChain->GetWindow() : nullptr;
+    if (window && !window->IsVisible() && !window->GetSettings().ShowAfterFirstPaint)
+        return false;
+
+    if (LastUsedFrame > 0 && RenderFPS > ZeroTolerance)
+    {
+        if (Time::Draw.UnscaledTime.GetTotalSeconds() < _lastFrameTime + (1.0f / RenderFPS))
+            return false;
+    }
+
+    return true;
 }
 
 void RenderTask::OnDraw()
@@ -82,6 +94,9 @@ void RenderTask::OnDraw()
     OnBegin(context);
     OnRender(context);
     OnEnd(context);
+
+    if (RenderFPS > ZeroTolerance)
+        _lastFrameTime = Time::Draw.UnscaledTime.GetTotalSeconds();
 }
 
 void RenderTask::OnBegin(GPUContext* context)

Source/Engine/Graphics/RenderTask.h

@@ -53,6 +53,8 @@ API_CLASS() class FLAXENGINE_API RenderTask : public ScriptingObject
 private:
     RenderTask* _prevTask = nullptr;
     
+    float _lastFrameTime = 0.0f;
+
 public:
     /// <summary>
     /// Finalizes an instance of the <see cref="RenderTask"/> class.
@@ -70,6 +72,11 @@ public:
     /// </summary>
     API_FIELD() int32 Order = 0;
 
+    /// <summary>
+    /// The framerate of the task, or how often the task rendering is performed per second.
+    /// </summary>
+    API_FIELD() int32 RenderFPS = 0;
+
     /// <summary>
     /// The amount of frames rendered by this task. It is auto incremented on task drawing.
     /// </summary>