Fix shadow atlas resizing bug

Source/Engine/Renderer/ShadowsPass.cpp

@@ -341,10 +341,8 @@ public:
     void Reset()
     {
         Lights.Clear();
-        StaticAtlasPixelsUsed = 0;
-        StaticAtlas.Clear();
         ClearDynamic();
-        ViewOrigin = Vector3::Zero;
+        ClearStatic();
     }
 
     void InitStaticAtlas()
@@ -1102,6 +1100,8 @@ void ShadowsPass::SetupShadows(RenderContext& renderContext, RenderContextBatch&
     if (shadows.Resolution != atlasResolution)
     {
         shadows.Reset();
+        shadows.Atlas.Reset();
+        shadows.StaticAtlas.Reset();
         auto desc = GPUTextureDescription::New2D(atlasResolution, atlasResolution, _shadowMapFormat, GPUTextureFlags::ShaderResource | GPUTextureFlags::DepthStencil);
         if (shadows.ShadowMapAtlas->Init(desc))
         {
@@ -1110,6 +1110,7 @@ void ShadowsPass::SetupShadows(RenderContext& renderContext, RenderContextBatch&
         }
         shadows.ClearShadowMapAtlas = true;
         shadows.Resolution = atlasResolution;
+        shadows.ViewOrigin = renderContext.View.Origin;
     }
     if (renderContext.View.Origin != shadows.ViewOrigin)
     {

Source/Engine/Utilities/RectPack.h

@@ -134,6 +134,18 @@ public:
         Init(Width, Height, BordersPadding);
     }
 
+    /// <summary>
+    /// Clears and resets atlas back to the initial state.
+    /// </summary>
+    void Reset()
+    {
+        Width = 0;
+        Height = 0;
+        BordersPadding = 0;
+        Nodes.Clear();
+        FreeNodes.Clear();
+    }
+
     /// <summary>
     /// Tries to insert a node into the atlas using rectangle pack algorithm.
     /// </summary>