Add some missing changes

Source/Engine/Graphics/GPUBuffer.cpp

@@ -244,6 +244,7 @@ bool GPUBuffer::DownloadData(BytesContainer& result)
     // Ensure not running on main thread
     if (IsInMainThread())
     {
+        // TODO: support mesh data download from GPU on a main thread during rendering
         LOG(Warning, "Cannot download GPU buffer data on a main thread. Use staging readback buffer or invoke this function from another thread.");
         return true;
     }

Source/Engine/Graphics/GPUContext.h

@@ -218,6 +218,13 @@ public:
     /// <param name="value">The clear value.</param>
     virtual void ClearUA(GPUTexture* texture, const uint32 value[4]) = 0;
 
+    /// <summary>
+    /// Clears an unordered access texture with a float value.
+    /// </summary>
+    /// <param name="texture">The texture to clear.</param>
+    /// <param name="value">The clear value.</param>
+    virtual void ClearUA(GPUTexture* texture, const Vector4& value) = 0;
+
 public:
 
     /// <summary>

Source/Engine/Graphics/Models/MeshBase.h

@@ -95,7 +95,6 @@ public:
     /// <summary>
     /// Determines whether this mesh is using 16 bit index buffer, otherwise it's 32 bit.
     /// </summary>
-    /// <returns>True if this mesh is using 16 bit index buffer, otherwise 32 bit index buffer.</returns>
     API_PROPERTY() FORCE_INLINE bool Use16BitIndexBuffer() const
     {
         return _use16BitIndexBuffer;

Source/Engine/Graphics/RenderBuffers.cpp

@@ -7,6 +7,9 @@
 #include "Engine/Graphics/RenderTargetPool.h"
 #include "Engine/Engine/Engine.h"
 
+// How many frames keep cached buffers for temporal or optional effects?
+#define LAZY_FRAMES_COUNT 4
+
 RenderBuffers::RenderBuffers(const SpawnParams& params)
     : ScriptingObject(params)
 {
@@ -35,8 +38,7 @@ void RenderBuffers::Prepare()
     if (VolumetricFog)
     {
         ASSERT(VolumetricFogHistory);
-
-        if (frameIndex - LastFrameVolumetricFog >= 4)
+        if (frameIndex - LastFrameVolumetricFog >= LAZY_FRAMES_COUNT)
         {
             RenderTargetPool::Release(VolumetricFog);
             VolumetricFog = nullptr;
@@ -48,7 +50,7 @@ void RenderBuffers::Prepare()
         }
     }
 #define UPDATE_LAZY_KEEP_RT(name) \
-	if (name && frameIndex - LastFrame##name >= 4) \
+	if (name && frameIndex - LastFrame##name >= LAZY_FRAMES_COUNT) \
 	{ \
 		RenderTargetPool::Release(name); \
 		name = nullptr; \