D3D12RayTracingResources.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    D3D12RayTracingResources.h: Internal D3D12 RHI RayTracing definitions.
=============================================================================*/
 
#pragma once
 
#include "HAL/Platform.h"
#include "RayTracingBuiltInResources.h"
 
using FD3D12_GPU_VIRTUAL_ADDRESS = uint64;
 
// Built-in local root parameters that are always bound to all hit shaders
// Contains union for bindless and non-bindless index/vertex buffer data to make the code handling the hit group parameters easier to use
// (otherwise all cached hit parameter code has to be done twice and stored twice making everything more complicated)
// Ideally the non bindless code path should be removed 'soon' - this constant buffer size for FD3D12HitGroupSystemParameters in Bindless is 8 bytes bigger than needed
struct FD3D12HitGroupSystemParameters
{   
    FHitGroupSystemRootConstants RootConstants;
    union
    {
        struct
        {
            uint32 BindlessHitGroupSystemIndexBuffer;
            uint32 BindlessHitGroupSystemVertexBuffer;
        };
        struct
        {
            FD3D12_GPU_VIRTUAL_ADDRESS IndexBuffer;
            FD3D12_GPU_VIRTUAL_ADDRESS VertexBuffer;
        };
    };
};
 
struct FD3D12RayTracingOfflineBvhHeader
{
    uint32 Size = 0;
    uint32 SerializedSize = 0;
};