Fix texture streaming minimum mips to load for block compressed textures

Source/Engine/Graphics/Textures/StreamingTexture.cpp

@@ -110,6 +110,14 @@ bool StreamingTexture::Create(const TextureHeader& header)
     // That's one of the main advantages of the current resources streaming system.
     _header = header;
     _isBlockCompressed = PixelFormatExtensions::IsCompressed(_header.Format);
+    if (_isBlockCompressed)
+    {
+        // Ensure that streaming doesn't go too low because the hardware expects the texture to be min in size of compressed texture block
+        int32 lastMip = header.MipLevels - 1;
+        while (header.Width >> lastMip < 4 && header.Height >> lastMip < 4)
+            lastMip--;
+        _minMipCountBlockCompressed = header.MipLevels - lastMip + 1;
+    }
 
     // Request resource streaming
 #if GPU_ENABLE_TEXTURES_STREAMING