＜山东大学项目实训＞渲染引擎系统（二）

目录

项目介绍

NRD

项目目标

当前工作内容

官方伪代码

---

项目介绍

NRD

全名Nvidia Real-time Denoiser ，是英伟达正在研发的一个时空双域降噪库，旨在处理低的RPP（ray per pixel）信号。

该技术的图形 API 环境是：DirectX11、DirectX12 以及 Vulkun。其集成方法有三种，其中一种可以是利用 Nvidia 的 NRI（NVIDIA Rendering Interface）包装上述三个 API，进行集成。

项目目标

在Falcor框架下集成nrd。

当前工作内容

根据官方伪代码设计集成思路

官方伪代码

//====================================================================================================================
// STEP 1 - DECLARATIONS
//====================================================================================================================

#include "NRIDescs.hpp"
#include "Extensions/NRIWrapperD3D12.h"
#include "Extensions/NRIHelper.h"

#include "NRD.h"

NrdIntegration NRD = NrdIntegration(maxNumberOfFramesInFlight);

struct NriInterface
    : public nri::CoreInterface
    , public nri::HelperInterface
    , public nri::WrapperD3D12Interface
{};
NriInterface NRI;

nri::Device* nriDevice = nullptr;

//====================================================================================================================
// STEP 2 - WRAP NATIVE DEVICE
//====================================================================================================================

nri::DeviceCreationD3D12Desc deviceDesc = {};
deviceDesc.d3d12Device = ...;
deviceDesc.d3d12PhysicalAdapter = ...;
deviceDesc.d3d12GraphicsQueue = ...;
deviceDesc.enableNRIValidation = false;

// Wrap the device
nri::Result result = nri::CreateDeviceFromD3D12Device(deviceDesc, nriDevice);

// Get needed functionality
result = nri::GetInterface(*nriDevice, NRI_INTERFACE(nri::CoreInterface), (nri::CoreInterface*)&NRI);
result = nri::GetInterface(*nriDevice, NRI_INTERFACE(nri::HelperInterface), (nri::HelperInterface*)&NRI);

// Get needed "wrapper" extension, XXX - can be D3D11, D3D12 or VULKAN
result = nri::GetInterface(*nriDevice, NRI_INTERFACE(nri::WrapperXXXInterface), (nri::WrapperXXXInterface*)&NRI);

//====================================================================================================================
// STEP 3 - INITIALIZE NRD
//====================================================================================================================

const nrd::MethodDesc methodDescs[] =
{
    // put neeeded methods here, like:
    { nrd::Method::REBLUR_DIFFUSE_SPECULAR, renderResolution.x, renderResolution.y },
};

nrd::DenoiserCreationDesc denoiserCreationDesc = {};
denoiserCreationDesc.requestedMethods = methodDescs;
denoiserCreationDesc.requestedMethodNum = methodNum;

bool result = NRD.Initialize(*nriDevice, NRI, NRI, denoiserCreationDesc);

//====================================================================================================================
// STEP 4 - WRAP NATIVE POINTERS
//====================================================================================================================

// Wrap the command buffer
nri::CommandBufferD3D12Desc cmdDesc = {};
cmdDesc.d3d12CommandList = (ID3D12GraphicsCommandList*)&d3d12CommandList;
cmdDesc.d3d12CommandAllocator = nullptr; // Not needed for NRD Integration layer

nri::CommandBuffer* cmdBuffer = nullptr;
NRI.CreateCommandBufferD3D12(*nriDevice, cmdDesc, cmdBuffer);

// Wrap required textures
nri::TextureTransitionBarrierDesc entryDescs[N] = {};
nri::Format entryFormat[N] = {};

for (uint32_t i = 0; i < N; i++)
{
    nri::TextureTransitionBarrierDesc& entryDesc = entryDescs[i];
    const MyResource& myResource = GetMyResource(i);

    nri::TextureD3D12Desc textureDesc = {};
    textureDesc.d3d12Resource = myResource->GetNativePointer();
    NRI.CreateTextureD3D12(*nriDevice, textureDesc, (nri::Texture*&)entryDesc.texture );

    // You need to specify the current state of the resource here, after denoising NRD can modify
    // this state. Application must continue state tracking from this point.
    // Useful information:
    //    SRV = nri::AccessBits::SHADER_RESOURCE, nri::TextureLayout::SHADER_RESOURCE
    //    UAV = nri::AccessBits::SHADER_RESOURCE_STORAGE, nri::TextureLayout::GENERAL
    entryDesc.nextAccess = ConvertResourceStateToAccessBits( myResource->GetCurrentState() );
    entryDesc.nextLayout = ConvertResourceStateToLayout( myResource->GetCurrentState() );
}

//====================================================================================================================
// STEP 5 - DENOISE
//====================================================================================================================

// Populate common settings
//  - for the first time use defaults
//  - currently NRD supports only the following view space: X - right, Y - top, Z - forward or backward
nrd::CommonSettings commonSettings = {};
PopulateCommonSettings(commonSettings);

// Set settings for each denoiser
nrd::NrdXxxSettings settings = {};
PopulateDenoiserSettings(settings);

NRD.SetMethodSettings(nrd::Method::NRD_XXX, &settings);

// Fill up the user pool
NrdUserPool userPool =
{
   {
    // Fill the required inputs and outputs in appropriate slots using entryDescs & entryFormat,
    // applying remapping if necessary. Unused slots can be {nullptr, nri::Format::UNKNOWN}
}};

NRD.Denoise(*cmdBuffer, commonSettings, userPool);

// !!! IMPORTANT !!!
// NRD integration layer binds its own descriptor pool, don't forget to re-bind back your own descriptor pool (heap)

//====================================================================================================================
// STEP 6 - CLEANUP
//====================================================================================================================

for (uint32_t i = 0; i < N; i++)
    NRI.DestroyTexture(entryDescs[i].texture);

NRI.DestroyCommandBuffer(*cmdBuffer);

//====================================================================================================================
// STEP 7 - DESTROY
//====================================================================================================================

NRD.Destroy();