text: //
  // Copyright (c) 2008-2018 the Urho3D project.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included in
  // all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  // THE SOFTWARE.
  //
  
  #pragma once
  
  #include "../Container/Ptr.h"
  #include "../Graphics/RenderSurface.h"
  #include "../Graphics/Texture.h"
  
  namespace Urho3D
  {
  
  class Deserializer;
  class Image;
  
  /// Cube texture resource.
  class URHO3D_API TextureCube : public Texture
  {
      URHO3D_OBJECT(TextureCube, Texture);
  
  public:
      /// Construct.
      explicit TextureCube(Context* context);
      /// Destruct.
      ~TextureCube() override;
      /// Register object factory.
      static void RegisterObject(Context* context);
  
      /// Load resource from stream. May be called from a worker thread. Return true if successful.
      bool BeginLoad(Deserializer& source) override;
      /// Finish resource loading. Always called from the main thread. Return true if successful.
      bool EndLoad() override;
      /// Mark the GPU resource destroyed on context destruction.
      void OnDeviceLost() override;
      /// Recreate the GPU resource and restore data if applicable.
      void OnDeviceReset() override;
      /// Release the texture.
      void Release() override;
  
      /// Set size, format, usage and multisampling parameter for rendertargets. Note that cube textures always use autoresolve when multisampled due to lacking support (on all APIs) to multisample them in a shader. Return true if successful.
      bool SetSize(int size, unsigned format, TextureUsage usage = TEXTURE_STATIC, int multiSample = 1);
      /// Set data either partially or fully on a face's mip level. Return true if successful.
      bool SetData(CubeMapFace face, unsigned level, int x, int y, int width, int height, const void* data);
      /// Set data of one face from a stream. Return true if successful.
      bool SetData(CubeMapFace face, Deserializer& source);
      /// Set data of one face from an image. Return true if successful. Optionally make a single channel image alpha-only.
      bool SetData(CubeMapFace face, Image* image, bool useAlpha = false);
  
      /// Get data from a face's mip level. The destination buffer must be big enough. Return true if successful.
      bool GetData(CubeMapFace face, unsigned level, void* dest) const;
      /// Get image data from a face's zero mip level. Only RGB and RGBA textures are supported.
      SharedPtr<Image> GetImage(CubeMapFace face) const;
  
      /// Return render surface for one face.
      RenderSurface* GetRenderSurface(CubeMapFace face) const { return renderSurfaces_[face]; }
  
  protected:
      /// Create the GPU texture.
      bool Create() override;
  
  private:
      /// Handle render surface update event.
      void HandleRenderSurfaceUpdate(StringHash eventType, VariantMap& eventData);
  
      /// Render surfaces.
      SharedPtr<RenderSurface> renderSurfaces_[MAX_CUBEMAP_FACES];
      /// Memory use per face.
      unsigned faceMemoryUse_[MAX_CUBEMAP_FACES]{};
      /// Face image files acquired during BeginLoad.
      Vector<SharedPtr<Image> > loadImages_;
      /// Parameter file acquired during BeginLoad.
      SharedPtr<XMLFile> loadParameters_;
  };
  
  }
  