Add events for streamable resources residency changes tracking

Source/Engine/Content/Assets/Model.cpp

@@ -91,6 +91,7 @@ public:
 
         // Update residency level
         model->_loadedLODs++;
+        model->ResidencyChanged();
 
         return false;
     }
@@ -697,11 +698,8 @@ bool Model::Init(const Span<int32>& meshesCountPerLod)
 
     // Setup LODs
     for (int32 lodIndex = 0; lodIndex < LODs.Count(); lodIndex++)
-    {
         LODs[lodIndex].Dispose();
-    }
     LODs.Resize(meshesCountPerLod.Length());
-    _loadedLODs = meshesCountPerLod.Length();
 
     // Setup meshes
     for (int32 lodIndex = 0; lodIndex < meshesCountPerLod.Length(); lodIndex++)
@@ -720,6 +718,10 @@ bool Model::Init(const Span<int32>& meshesCountPerLod)
         }
     }
 
+    // Update resource residency
+    _loadedLODs = meshesCountPerLod.Length();
+    ResidencyChanged();
+
     return false;
 }
 
@@ -836,6 +838,7 @@ Task* Model::CreateStreamingTask(int32 residency)
         for (int32 i = HighestResidentLODIndex(); i < LODs.Count() - residency; i++)
             LODs[i].Unload();
         _loadedLODs = residency;
+        ResidencyChanged();
     }
 
     return result;
@@ -945,7 +948,7 @@ Asset::LoadResult Model::load()
             sdfStream.Read(&data);
             if (!SDF.Texture)
                 SDF.Texture = GPUTexture::New();
-            if (SDF.Texture->Init(GPUTextureDescription::New3D(data.Width, data.Height, data.Depth, data.Format, GPUTextureFlags::ShaderResource | GPUTextureFlags::UnorderedAccess, data.MipLevels)))
+            if (SDF.Texture->Init(GPUTextureDescription::New3D(data.Width, data.Height, data.Depth, data.Format, GPUTextureFlags::ShaderResource, data.MipLevels)))
                 return LoadResult::Failed;
             SDF.LocalToUVWMul = data.LocalToUVWMul;
             SDF.LocalToUVWAdd = data.LocalToUVWAdd;

Source/Engine/Content/Assets/SkinnedModel.cpp

@@ -85,6 +85,7 @@ protected:
 
         // Update residency level
         model->_loadedLODs++;
+        model->ResidencyChanged();
 
         return false;
     }
@@ -676,11 +677,8 @@ bool SkinnedModel::Init(const Span<int32>& meshesCountPerLod)
 
     // Setup LODs
     for (int32 lodIndex = 0; lodIndex < LODs.Count(); lodIndex++)
-    {
         LODs[lodIndex].Dispose();
-    }
     LODs.Resize(meshesCountPerLod.Length());
-    _loadedLODs = meshesCountPerLod.Length();
 
     // Setup meshes
     for (int32 lodIndex = 0; lodIndex < meshesCountPerLod.Length(); lodIndex++)
@@ -699,6 +697,10 @@ bool SkinnedModel::Init(const Span<int32>& meshesCountPerLod)
         }
     }
 
+    // Update resource residency
+    _loadedLODs = meshesCountPerLod.Length();
+    ResidencyChanged();
+
     return false;
 }
 
@@ -827,6 +829,7 @@ Task* SkinnedModel::CreateStreamingTask(int32 residency)
         for (int32 i = HighestResidentLODIndex(); i < LODs.Count() - residency; i++)
             LODs[i].Unload();
         _loadedLODs = residency;
+        ResidencyChanged();
     }
 
     return result;

Source/Engine/Graphics/Textures/GPUTexture.cpp

@@ -814,4 +814,5 @@ void GPUTexture::SetResidentMipLevels(int32 count)
         return;
     _residentMipLevels = count;
     OnResidentMipsChanged();
+    ResidentMipsChanged(this);
 }

Source/Engine/Graphics/Textures/GPUTexture.h

@@ -568,6 +568,11 @@ public:
     /// </summary>
     API_PROPERTY() void SetResidentMipLevels(int32 count);
     
+    /// <summary>
+    /// Event called when texture residency gets changed. Texture Mip gets loaded into GPU memory and is ready to use.
+    /// </summary>
+    Delegate<GPUTexture*> ResidentMipsChanged;
+
 protected:
 
     virtual bool OnInit() = 0;

Source/Engine/Graphics/Textures/StreamingTexture.cpp

@@ -233,6 +233,7 @@ protected:
     {
         Swap(_streamingTexture->_texture, _newTexture);
         _streamingTexture->GetTexture()->SetResidentMipLevels(_uploadedMipCount);
+        _streamingTexture->ResidencyChanged();
         SAFE_DELETE_GPU_RESOURCE(_newTexture);
 
         // Base
@@ -447,6 +448,7 @@ Task* StreamingTexture::CreateStreamingTask(int32 residency)
         {
             // Do the quick data release
             _texture->ReleaseGPU();
+            ResidencyChanged();
         }
         else
         {

Source/Engine/Streaming/StreamableResource.h

@@ -2,6 +2,7 @@
 
 #pragma once
 
+#include "Engine/Core/Delegate.h"
 #include "Engine/Core/Collections/SamplesBuffer.h"
 
 class StreamingGroup;
@@ -111,6 +112,11 @@ public:
     };
 
     StreamingCache Streaming;
+    
+    /// <summary>
+    /// Event called when current resource residency gets changed (eg. model LOD or texture MIP gets loaded). Usually called from async thread.
+    /// </summary>
+    Action ResidencyChanged;
 
     /// <summary>
     /// Requests the streaming update for this resource during next streaming manager update.