DirectX 12 API

Create D3D12 Device

        CD3DX12_CPU_DESCRIPTOR_HANDLE rtvHandle(m_rtvHeap->GetCPUDescriptorHandleForHeapStart());

        // Create a RTV for each frame.

        for (UINT n = 0; n < FrameCount; n++)

        {

            ThrowIfFailed(m_swapChain->GetBuffer(n, IID_PPV_ARGS(&m_renderTargets[n])));

            m_device->CreateRenderTargetView(m_renderTargets[n].Get(), nullptr, rtvHandle);

            rtvHandle.Offset(1, m_rtvDescriptorSize);

        }

Create Command Queue

    D3D12_COMMAND_QUEUE_DESC queueDesc = {};

    queueDesc.Flags = D3D12_COMMAND_QUEUE_FLAG_NONE;

    queueDesc.Type = D3D12_COMMAND_LIST_TYPE_DIRECT;

    ThrowIfFailed(m_device->CreateCommandQueue(&queueDesc, IID_PPV_ARGS(&m_commandQueue)));

Create Swap Chain

    DXGI_SWAP_CHAIN_DESC1 swapChainDesc = {};

    swapChainDesc.BufferCount = FrameCount;

    swapChainDesc.Width = m_width;

    swapChainDesc.Height = m_height;

    swapChainDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;

    swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;

    swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_DISCARD;

    swapChainDesc.SampleDesc.Count = 1;

    ComPtr<IDXGISwapChain1> swapChain;

    ThrowIfFailed(factory->CreateSwapChainForHwnd(

    m_commandQueue.Get(),        // Swap chain needs the queue so that it can force a flush on it.

    Win32Application::GetHwnd(),         &swapChainDesc,          nullptr ,          nullptr ,          & swapChain         ));

Create Descriptor Heap / Render Target View

        D3D12_DESCRIPTOR_HEAP_DESC rtvHeapDesc = {};

        rtvHeapDesc.NumDescriptors = FrameCount;

        rtvHeapDesc.Type = D3D12_DESCRIPTOR_HEAP_TYPE_RTV;

        rtvHeapDesc.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_NONE;

        ThrowIfFailed(m_device->CreateDescriptorHeap(&rtvHeapDesc, IID_PPV_ARGS(&m_rtvHeap)));

        m_rtvDescriptorSize = m_device->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_RTV);

        CD3DX12_CPU_DESCRIPTOR_HANDLE rtvHandle(m_rtvHeap->GetCPUDescriptorHandleForHeapStart());

        // Create a RTV for each frame.

        for (UINT n = 0; n < FrameCount; n++)

        {

            ThrowIfFailed(m_swapChain->GetBuffer(n, IID_PPV_ARGS(&m_renderTargets[n])));

            m_device->CreateRenderTargetView(m_renderTargets[n].Get(), nullptr, rtvHandle);

            rtvHandle.Offset(1, m_rtvDescriptorSize);

        }

Create Command List

          ThrowIfFailed(m_device -> CreateCommandAllocator( D3D12_COMMAND_LIST_TYPE_DIRECT ,  IID_PPV_ARGS ( & m_commandAllocator)));

    // Create the command list.

    ThrowIfFailed(m_device->CreateCommandList(0, D3D12_COMMAND_LIST_TYPE_DIRECT, m_commandAllocator.Get(), nullptr, IID_PPV_ARGS(&m_commandList)));

    // Command lists are created in the recording state, but there is nothing

    // to record yet. The main loop expects it to be closed, so close it now.

    ThrowIfFailed(m_commandList->Close());