crossdesk/demo/d3dHelpers.h

#pragma once
#include "composition.interop.h"

struct SurfaceContext {
public:
  SurfaceContext(std::nullptr_t) {}
  SurfaceContext(
      winrt::Windows::UI::Composition::CompositionDrawingSurface surface) {
    m_surface = surface;
    m_d2dContext = SurfaceBeginDraw(m_surface);
  }
  ~SurfaceContext() {
    SurfaceEndDraw(m_surface);
    m_d2dContext = nullptr;
    m_surface = nullptr;
  }

  winrt::com_ptr<ID2D1DeviceContext> GetDeviceContext() { return m_d2dContext; }

private:
  winrt::com_ptr<ID2D1DeviceContext> m_d2dContext;
  winrt::Windows::UI::Composition::CompositionDrawingSurface m_surface{nullptr};
};

struct D3D11DeviceLock {
public:
  D3D11DeviceLock(std::nullopt_t) {}
  D3D11DeviceLock(ID3D11Multithread *pMultithread) {
    m_multithread.copy_from(pMultithread);
    m_multithread->Enter();
  }
  ~D3D11DeviceLock() {
    m_multithread->Leave();
    m_multithread = nullptr;
  }

private:
  winrt::com_ptr<ID3D11Multithread> m_multithread;
};

inline auto CreateWICFactory() {
  winrt::com_ptr<IWICImagingFactory2> wicFactory;
  winrt::check_hresult(::CoCreateInstance(
      CLSID_WICImagingFactory, nullptr, CLSCTX_INPROC_SERVER,
      winrt::guid_of<IWICImagingFactory>(), wicFactory.put_void()));

  return wicFactory;
}

inline auto CreateD2DDevice(winrt::com_ptr<ID2D1Factory1> const &factory,
                            winrt::com_ptr<ID3D11Device> const &device) {
  winrt::com_ptr<ID2D1Device> result;
  winrt::check_hresult(
      factory->CreateDevice(device.as<IDXGIDevice>().get(), result.put()));
  return result;
}

inline auto CreateD3DDevice(D3D_DRIVER_TYPE const type,
                            winrt::com_ptr<ID3D11Device> &device) {
  WINRT_ASSERT(!device);

  UINT flags = D3D11_CREATE_DEVICE_BGRA_SUPPORT;

  //#ifdef _DEBUG
  //	flags |= D3D11_CREATE_DEVICE_DEBUG;
  //#endif

  return D3D11CreateDevice(nullptr, type, nullptr, flags, nullptr, 0,
                           D3D11_SDK_VERSION, device.put(), nullptr, nullptr);
}

inline auto CreateD3DDevice() {
  winrt::com_ptr<ID3D11Device> device;
  HRESULT hr = CreateD3DDevice(D3D_DRIVER_TYPE_HARDWARE, device);

  if (DXGI_ERROR_UNSUPPORTED == hr) {
    hr = CreateD3DDevice(D3D_DRIVER_TYPE_WARP, device);
  }

  winrt::check_hresult(hr);
  return device;
}

inline auto CreateD2DFactory() {
  D2D1_FACTORY_OPTIONS options{};

  //#ifdef _DEBUG
  //	options.debugLevel = D2D1_DEBUG_LEVEL_INFORMATION;
  //#endif

  winrt::com_ptr<ID2D1Factory1> factory;

  winrt::check_hresult(D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED,
                                         options, factory.put()));

  return factory;
}

inline auto CreateDXGISwapChain(winrt::com_ptr<ID3D11Device> const &device,
                                const DXGI_SWAP_CHAIN_DESC1 *desc) {
  auto dxgiDevice = device.as<IDXGIDevice2>();
  winrt::com_ptr<IDXGIAdapter> adapter;
  winrt::check_hresult(dxgiDevice->GetParent(winrt::guid_of<IDXGIAdapter>(),
                                             adapter.put_void()));
  winrt::com_ptr<IDXGIFactory2> factory;
  winrt::check_hresult(
      adapter->GetParent(winrt::guid_of<IDXGIFactory2>(), factory.put_void()));

  winrt::com_ptr<IDXGISwapChain1> swapchain;
  winrt::check_hresult(factory->CreateSwapChainForComposition(
      device.get(), desc, nullptr, swapchain.put()));

  return swapchain;
}

inline auto CreateDXGISwapChain(winrt::com_ptr<ID3D11Device> const &device,
                                uint32_t width, uint32_t height,
                                DXGI_FORMAT format, uint32_t bufferCount) {
  DXGI_SWAP_CHAIN_DESC1 desc = {};
  desc.Width = width;
  desc.Height = height;
  desc.Format = format;
  desc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
  desc.SampleDesc.Count = 1;
  desc.SampleDesc.Quality = 0;
  desc.BufferCount = bufferCount;
  desc.Scaling = DXGI_SCALING_STRETCH;
  desc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL;
  desc.AlphaMode = DXGI_ALPHA_MODE_PREMULTIPLIED;

  return CreateDXGISwapChain(device, &desc);
}