text: //
  // Copyright (c) 2008-2015 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 Image;
  class XMLFile;
  
  /// 2D texture resource.
  class URHO3D_API Texture2D : public Texture
  {
      URHO3D_OBJECT(Texture2D, Texture);
  
  public:
      /// Construct.
      Texture2D(Context* context);
      /// Destruct.
      virtual ~Texture2D();
      /// Register object factory.
      static void RegisterObject(Context* context);
  
      /// Load resource from stream. May be called from a worker thread. Return true if successful.
      virtual bool BeginLoad(Deserializer& source);
      /// Finish resource loading. Always called from the main thread. Return true if successful.
      virtual bool EndLoad();
      /// Mark the GPU resource destroyed on context destruction.
      virtual void OnDeviceLost();
      /// Recreate the GPU resource and restore data if applicable.
      virtual void OnDeviceReset();
      /// Release the texture.
      virtual void Release();
  
      /// Set size, format and usage. Zero size will follow application window size. Return true if successful.
      bool SetSize(int width, int height, unsigned format, TextureUsage usage = TEXTURE_STATIC);
      /// Set data either partially or fully on a mip level. Return true if successful.
      bool SetData(unsigned level, int x, int y, int width, int height, const void* data);
      /// Set data from an image. Return true if successful. Optionally make a single channel image alpha-only.
      bool SetData(SharedPtr<Image> image, bool useAlpha = false);
  
      /// Get data from a mip level. The destination buffer must be big enough. Return true if successful.
      bool GetData(unsigned level, void* dest) const;
  
      /// Return render surface.
      RenderSurface* GetRenderSurface() const { return renderSurface_; }
  
  protected:
      /// Create texture.
      virtual bool Create();
  
  private:
      /// Handle render surface update event.
      void HandleRenderSurfaceUpdate(StringHash eventType, VariantMap& eventData);
  
      /// Render surface.
      SharedPtr<RenderSurface> renderSurface_;
      /// Image file acquired during BeginLoad.
      SharedPtr<Image> loadImage_;
      /// Parameter file acquired during BeginLoad.
      SharedPtr<XMLFile> loadParameters_;
  };
  
  }
  