text: /*
   * Copyright (c) Contributors to the Open 3D Engine Project.
   * For complete copyright and license terms please see the LICENSE at the root of this distribution.
   *
   * SPDX-License-Identifier: Apache-2.0 OR MIT
   *
   */
  #pragma once
  
  #include <Atom/RPI.Public/Pass/FullscreenTrianglePass.h>
  #include <Atom/RPI.Public/Pass/ParentPass.h>
  
  namespace AZ
  {
      namespace Render
      {
          //! This pass performs a separable Gaussian blur of the input reflection image
          //! to the lower mip levels of that image.  The blurred mips are used as roughness levels
          //! when applying reflection data to a surface material.
          class ReflectionScreenSpaceBlurPass
              : public RPI::ParentPass
          {
              AZ_RPI_PASS(ReflectionScreenSpaceBlurPass);
  
          public:
              AZ_RTTI(Render::ReflectionScreenSpaceBlurPass, "{BC3D92C5-E38A-46FE-8EBD-CAD14E505946}", ParentPass);
              AZ_CLASS_ALLOCATOR(Render::ReflectionScreenSpaceBlurPass, SystemAllocator, 0);
            
              //! Creates a new pass without a PassTemplate
              static RPI::Ptr<ReflectionScreenSpaceBlurPass> Create(const RPI::PassDescriptor& descriptor);
  
              //! Returns the frame buffer image attachment used by the ReflectionFrameBufferCopy pass
              //! to store the previous frame image
              Data::Instance<RPI::AttachmentImage>& GetFrameBufferImageAttachment() { return m_frameBufferImageAttachment; }
  
              //! Returns the number of mip levels in the blur
              uint32_t GetNumBlurMips() const { return m_numBlurMips; }
  
          private:
              explicit ReflectionScreenSpaceBlurPass(const RPI::PassDescriptor& descriptor);
  
              void CreateChildPassesInternal() override;
  
              // Pass Overrides...
              void ResetInternal() override;
              void BuildInternal() override;
  
              AZStd::vector<RPI::Ptr<RPI::FullscreenTrianglePass>> m_verticalBlurChildPasses;
              AZStd::vector<RPI::Ptr<RPI::FullscreenTrianglePass>> m_horizontalBlurChildPasses;
  
              Data::Instance<RPI::AttachmentImage> m_frameBufferImageAttachment;
              uint32_t m_numBlurMips = 0;
          };
      }   // namespace RPI
  }   // namespace AZ
  