o3de/Gems/Atom/Feature/Common/Code/Source/RayTracing/RayTracingAccelerationStructurePass.h

/*
 * 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/RHI/ScopeProducer.h>
#include <Atom/RPI.Public/Pass/Pass.h>
#include <Atom/RPI.Public/Buffer/Buffer.h>
#include <Atom/RHI/RayTracingBufferPools.h>

namespace AZ
{
    namespace Render
    {
        //! This pass builds the RayTracing acceleration structures for a scene
        class RayTracingAccelerationStructurePass final
            : public RPI::Pass
            , public RHI::ScopeProducer
        {
        public:
            AZ_RPI_PASS(RayTracingAccelerationStructurePass);

            AZ_RTTI(RayTracingAccelerationStructurePass, "{6BAA1755-D7D2-497F-BCDB-CA28B42728DC}", Pass);
            AZ_CLASS_ALLOCATOR(RayTracingAccelerationStructurePass, SystemAllocator);

            //! Creates a RayTracingAccelerationStructurePass
            static RPI::Ptr<RayTracingAccelerationStructurePass> Create(const RPI::PassDescriptor& descriptor);

            ~RayTracingAccelerationStructurePass() = default;

        private:
            explicit RayTracingAccelerationStructurePass(const RPI::PassDescriptor& descriptor);

            // Scope producer functions
            void SetupFrameGraphDependencies(RHI::FrameGraphInterface frameGraph) override;
            void BuildCommandList(const RHI::FrameGraphExecuteContext& context) override;

            // Pass overrides
            void BuildInternal() override;
            void FrameBeginInternal(FramePrepareParams params) override;

            // buffer view descriptor for the TLAS
            RHI::BufferViewDescriptor m_tlasBufferViewDescriptor;

            // revision number of the ray tracing data when the TLAS was built
            uint32_t m_rayTracingRevision = 0;
        };
    }   // namespace RPI
}   // namespace AZ