Check DirectX Raytracing support [WITH COMMENTS]

dxrcheck.h

inline bool IsDirectXRaytracingSupported(IDXGIAdapter1* adapter)
{
    ComPtr<ID3D12Device> testDevice;
    D3D12_FEATURE_DATA_D3D12_OPTIONS5 featureSupportData = {};
    
    // create Direct3D 12 device with 11.0 FL
    // IID_PPV_ARGS automatically computes interface ID (REFIID that equals to IID_ID3D12Device)
    // and the pointer and passes them as two comma-separated arguments
    return SUCCEEDED(D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_11_0, IID_PPV_ARGS(&testDevice)))
        // check support for OPTIONS5 (will work only on Windows 10 1803+)
        // https://docs.microsoft.com/ru-ru/windows/win32/api/d3d12/ne-d3d12-d3d12_feature
        && SUCCEEDED(testDevice->CheckFeatureSupport(D3D12_FEATURE_D3D12_OPTIONS5, &featureSupportData, sizeof(featureSupportData)))
        
        // verify that raytracing is supported
        // https://docs.microsoft.com/en-us/windows/win32/api/d3d12/ns-d3d12-d3d12_feature_data_d3d12_options5
        // https://docs.microsoft.com/en-us/windows/win32/api/d3d12/ne-d3d12-d3d12_raytracing_tier
        && featureSupportData.RaytracingTier != D3D12_RAYTRACING_TIER_NOT_SUPPORTED;
}

dxrcheck_full.cpp

// Copyright (c) 2019 Antinomy Interactive. All rights reserved.
// PURPOSE: Check for DXR support
// AUTHOR: Andrey Tsurkan (andrey.turcan@hotmail.com)

#include <iostream>
#include <windows.h>
#include <dxgi.h>
#include <d3d12.h>
#include <wrl.h>

#pragma comment(lib, "dxgi.lib")
#pragma comment(lib, "d3d12.lib")

using namespace Microsoft::WRL;

// https://gist.github.com/equalent/213779e8edca8e0c15afd10400f88324
inline bool IsDirectXRaytracingSupported(IDXGIAdapter1* adapter)
{
	ComPtr<ID3D12Device> testDevice;
	D3D12_FEATURE_DATA_D3D12_OPTIONS5 featureSupportData = {};

	// create Direct3D 12 device with 11.0 FL
	// IID_PPV_ARGS automatically computes interface ID (REFIID that equals to IID_ID3D12Device)
	// and the pointer and passes them as two comma-separated arguments
	return SUCCEEDED(D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_11_0, IID_PPV_ARGS(&testDevice)))
		// check support for OPTIONS5 (will work only on Windows 10 1803+)
		// https://docs.microsoft.com/ru-ru/windows/win32/api/d3d12/ne-d3d12-d3d12_feature
		&& SUCCEEDED(testDevice->CheckFeatureSupport(D3D12_FEATURE_D3D12_OPTIONS5, &featureSupportData, sizeof(featureSupportData)))

		// verify that raytracing is supported
		// https://docs.microsoft.com/en-us/windows/win32/api/d3d12/ns-d3d12-d3d12_feature_data_d3d12_options5
		// https://docs.microsoft.com/en-us/windows/win32/api/d3d12/ne-d3d12-d3d12_raytracing_tier
		&& featureSupportData.RaytracingTier != D3D12_RAYTRACING_TIER_NOT_SUPPORTED;
}

int main()
{
	ComPtr<IDXGIFactory1> pFactory;
	ComPtr<IDXGIAdapter1> pAdapter;

	if (FAILED(CreateDXGIFactory1(IID_PPV_ARGS(&pFactory)))) {
		std::cout << "Unable to create IDXGIFactory1!\n";
		return 1;
	}

	HRESULT hr = pFactory->EnumAdapters1(0, &pAdapter);
	if (FAILED(hr)) {
		std::cout << "Unable to enumerate adapters!\n";
		return 1;
	}

	if (IsDirectXRaytracingSupported(pAdapter.Get())) {
		std::cout << "DirectX 12 Raytracing is supported!\n";
	}
	else {
		std::cout << "DirectX 12 Raytracing is not supported!\n";
	}
	return 0;
}