DirectXBase.cpp

#include "pch.h"
#include "DirectXBase.h" 
#include <windows.ui.xaml.media.dxinterop.h>
#include <math.h>

using namespace D2D1;
using namespace DirectX;
using namespace Microsoft::WRL;
using namespace Windows::Foundation;
using namespace Windows::Graphics::Display;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml::Controls;

// Constructor.
DirectXBase::DirectXBase() :
	m_dpi(-1.0f)
{
}

// Initialize the DirectX resources required to run.
void DirectXBase::Initialize(CoreWindow^ window, SwapChainBackgroundPanel^ panel, float dpi)
{
	m_window = window;
	m_panel = panel;

	CreateDeviceIndependentResources();
	CreateDeviceResources();
	SetDpi(dpi);
}

// Recreate all device resources and set them back to the current state.
void DirectXBase::HandleDeviceLost()
{
	// Reset these member variables to ensure that SetDpi recreates all resources.
	float dpi = m_dpi;
	m_dpi = -1.0f;
	m_windowBounds.Width = 0;
	m_windowBounds.Height = 0;
	m_swapChain = nullptr;

	CreateDeviceResources();
	SetDpi(dpi);
}

// These are the resources required independent of the device.
void DirectXBase::CreateDeviceIndependentResources()
{
	D2D1_FACTORY_OPTIONS options;
	ZeroMemory(&options, sizeof(D2D1_FACTORY_OPTIONS));

#if defined(_DEBUG)
	 // If the project is in a debug build, enable Direct2D debugging via SDK Layers.
	options.debugLevel = D2D1_DEBUG_LEVEL_INFORMATION;
#endif

	DX::ThrowIfFailed(
		D2D1CreateFactory(
			D2D1_FACTORY_TYPE_SINGLE_THREADED,
			__uuidof(ID2D1Factory1),
			&options,
			&m_d2dFactory
			)
		);

	DX::ThrowIfFailed(
		DWriteCreateFactory(
			DWRITE_FACTORY_TYPE_SHARED,
			__uuidof(IDWriteFactory),
			&m_dwriteFactory
			)
		);

	DX::ThrowIfFailed(
		CoCreateInstance(
			CLSID_WICImagingFactory,
			nullptr,
			CLSCTX_INPROC_SERVER,
			IID_PPV_ARGS(&m_wicFactory)
			)
		);
}

// These are the resources that depend on the device.
void DirectXBase::CreateDeviceResources()
{
	// This flag adds support for surfaces with a different color channel ordering
	// than the API default. It is required for compatibility with Direct2D.
	UINT creationFlags = D3D11_CREATE_DEVICE_BGRA_SUPPORT;
	ComPtr<IDXGIDevice> dxgiDevice;

#if defined(_DEBUG)
	// If the project is in a debug build, enable debugging via SDK Layers with this flag.
	creationFlags |= D3D11_CREATE_DEVICE_DEBUG;
#endif

	// This array defines the set of DirectX hardware feature levels this app will support.
	// Note the ordering should be preserved.
	// Don't forget to declare your application's minimum required feature level in its
	// description.  All applications are assumed to support 9.1 unless otherwise stated.
	D3D_FEATURE_LEVEL featureLevels[] = 
	{
		D3D_FEATURE_LEVEL_11_1,
		D3D_FEATURE_LEVEL_11_0,
		D3D_FEATURE_LEVEL_10_1,
		D3D_FEATURE_LEVEL_10_0,
		D3D_FEATURE_LEVEL_9_3,
		D3D_FEATURE_LEVEL_9_2,
		D3D_FEATURE_LEVEL_9_1
	};

	// Create the Direct3D 11 API device object and a corresponding context.
	ComPtr<ID3D11Device> d3dDevice;
	ComPtr<ID3D11DeviceContext> d3dContext;
	DX::ThrowIfFailed(
		D3D11CreateDevice(
			nullptr, // Specify nullptr to use the default adapter.
			D3D_DRIVER_TYPE_HARDWARE,
			0,
			creationFlags, // Set debug and Direct2D compatibility flags.
			featureLevels, // List of feature levels this app can support.
			ARRAYSIZE(featureLevels),
			D3D11_SDK_VERSION, // Always set this to D3D11_SDK_VERSION for Windows Store apps.
			&d3dDevice, // Returns the Direct3D device created.
			&m_d3dFeatureLevel, // Returns feature level of device created.
			&d3dContext // Returns the device immediate context.
			)
		);

	// Get the Direct3D 11.1 API device and context interfaces.
	DX::ThrowIfFailed(
		d3dDevice.As(&m_d3dDevice)
		);

	DX::ThrowIfFailed(
		d3dContext.As(&m_d3dContext)
		);

	// Get the underlying DXGI device of the Direct3D device.
	DX::ThrowIfFailed(
		m_d3dDevice.As(&dxgiDevice)
		);

	// Create the Direct2D device object and a corresponding context.
	DX::ThrowIfFailed(
		m_d2dFactory->CreateDevice(dxgiDevice.Get(), &m_d2dDevice)
		);

	DX::ThrowIfFailed(
		m_d2dDevice->CreateDeviceContext(
			D2D1_DEVICE_CONTEXT_OPTIONS_NONE,
			&m_d2dContext
			)
		);
}

// This method is called in the event handler for the LogicalDpiChanged event.
void DirectXBase::SetDpi(float dpi)
{
	if (dpi != m_dpi)
	{
		// Save the updated DPI value.
		m_dpi = dpi;
		
		// Update Direct2D's stored DPI.
		m_d2dContext->SetDpi(m_dpi, m_dpi);

		// Often a DPI change implies a window size change. In some cases Windows will issue
		// both a size changed event and a DPI changed event. In this case, the resulting bounds 
		// will not change, and the window resize code will only be executed once.
		UpdateForWindowSizeChange();
	}
}

// This method is called in the event handler for the SizeChanged event.
void DirectXBase::UpdateForWindowSizeChange()
{
	// Only handle window size changed if there is no pending DPI change.
	if (m_dpi != DisplayProperties::LogicalDpi)
	{
		return;
	}

	if (m_window->Bounds.Width  != m_windowBounds.Width ||
		m_window->Bounds.Height != m_windowBounds.Height ||
		m_orientation != DisplayProperties::CurrentOrientation)
	{
		ID3D11RenderTargetView* nullViews[] = {nullptr};
		m_d3dContext->OMSetRenderTargets(ARRAYSIZE(nullViews), nullViews, nullptr);
		m_d2dContext->SetTarget(nullptr);
		m_d2dTargetBitmap = nullptr;
		m_d3dRenderTargetView = nullptr;
		m_d3dDepthStencilView = nullptr;
		m_d3dContext->Flush();
		CreateWindowSizeDependentResources();
	}
}

// Allocate all memory resources that change on a window SizeChanged event.
void DirectXBase::CreateWindowSizeDependentResources()
{
	// Store the window bounds so the next time we get a SizeChanged event we can
	// avoid rebuilding everything if the size is identical.
	m_windowBounds = m_window->Bounds;

	// Calculate the necessary swap chain and render target size in pixels.
	float windowWidth = ConvertDipsToPixels(m_windowBounds.Width);
	float windowHeight = ConvertDipsToPixels(m_windowBounds.Height);

	// The width and height of the swap chain must be based on the window's
	// landscape-oriented width and height. If the window is in a portrait
	// orientation, the dimensions must be reversed.
	m_orientation = DisplayProperties::CurrentOrientation;
	bool swapDimensions =
		m_orientation == DisplayOrientations::Portrait ||
		m_orientation == DisplayOrientations::PortraitFlipped;
	m_d3dRenderTargetSize.Width = swapDimensions ? windowHeight : windowWidth;
	m_d3dRenderTargetSize.Height = swapDimensions ? windowWidth : windowHeight;

	if (m_swapChain != nullptr)
	{
		// If the swap chain already exists, resize it.
		HRESULT hr = m_swapChain->ResizeBuffers(
			2, // Double-buffered swap chain.
			static_cast<UINT>(m_d3dRenderTargetSize.Width),
			static_cast<UINT>(m_d3dRenderTargetSize.Height),
			DXGI_FORMAT_B8G8R8A8_UNORM,
			0
			);

		if (hr == DXGI_ERROR_DEVICE_REMOVED)
		{
			HandleDeviceLost();
			return;
		}
		else
		{
			DX::ThrowIfFailed(hr);
		}
	}
	else
	{
		// Otherwise, create a new one using the same adapter as the existing Direct3D device.
		DXGI_SWAP_CHAIN_DESC1 swapChainDesc = {0};
		swapChainDesc.Width = static_cast<UINT>(m_d3dRenderTargetSize.Width); // Match the size of the window.
		swapChainDesc.Height = static_cast<UINT>(m_d3dRenderTargetSize.Height);
		swapChainDesc.Format = DXGI_FORMAT_B8G8R8A8_UNORM; // This is the most common swap chain format.
		swapChainDesc.Stereo = false; 
		swapChainDesc.SampleDesc.Count = 1; // Don't use multi-sampling.
		swapChainDesc.SampleDesc.Quality = 0;
		swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT;
		swapChainDesc.BufferCount = 2; // Use double-buffering to minimize latency.
		swapChainDesc.Scaling = DXGI_SCALING_STRETCH;
		swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL; // All Windows Store apps must use this SwapEffect.
		swapChainDesc.Flags = 0;

		ComPtr<IDXGIDevice1> dxgiDevice;
		DX::ThrowIfFailed(
			m_d3dDevice.As(&dxgiDevice)
			);

		ComPtr<IDXGIAdapter> dxgiAdapter;
		DX::ThrowIfFailed(
			dxgiDevice->GetAdapter(&dxgiAdapter)
			);

		ComPtr<IDXGIFactory2> dxgiFactory;
		DX::ThrowIfFailed(
			dxgiAdapter->GetParent(IID_PPV_ARGS(&dxgiFactory))
			);

		DX::ThrowIfFailed(
			dxgiFactory->CreateSwapChainForComposition(
				m_d3dDevice.Get(),
				&swapChainDesc,
				nullptr,
				&m_swapChain
				)
			);

		// Associate the new swap chain with the SwapChainBackgroundPanel element.
		ComPtr<ISwapChainBackgroundPanelNative> panelNative;
		DX::ThrowIfFailed(
			reinterpret_cast<IUnknown*>(m_panel)->QueryInterface(IID_PPV_ARGS(&panelNative))
			);
		
		DX::ThrowIfFailed(
			panelNative->SetSwapChain(m_swapChain.Get())
			);

		// Ensure that DXGI does not queue more than one frame at a time. This both reduces latency and
		// ensures that the application will only render after each VSync, minimizing power consumption.
		DX::ThrowIfFailed(
			dxgiDevice->SetMaximumFrameLatency(1)
			);
	}

	// Set the proper orientation for the swap chain, and generate 2D and
	// 3D matrix transformations for rendering to the rotated swap chain.
	// Note the rotation angle for the 2D and 3D transforms are different.
	// This is due to the difference in coordinate spaces.  Additionally,
	// the 3D matrix is specified explicitly to avoid rounding errors.
	DXGI_MODE_ROTATION rotation = DXGI_MODE_ROTATION_UNSPECIFIED;
	switch (m_orientation)
	{
		case DisplayOrientations::Landscape:
			rotation = DXGI_MODE_ROTATION_IDENTITY;
			m_orientationTransform2D = Matrix3x2F::Identity();
			m_orientationTransform3D = XMFLOAT4X4( // 0-degree Z-rotation
				1.0f, 0.0f, 0.0f, 0.0f,
				0.0f, 1.0f, 0.0f, 0.0f,
				0.0f, 0.0f, 1.0f, 0.0f,
				0.0f, 0.0f, 0.0f, 1.0f
				);
			break;

		case DisplayOrientations::Portrait:
			rotation = DXGI_MODE_ROTATION_ROTATE270;
			m_orientationTransform2D = 
				Matrix3x2F::Rotation(270.0f) *
				Matrix3x2F::Translation(0.0f, m_windowBounds.Width);
			m_orientationTransform3D = XMFLOAT4X4( // 90-degree Z-rotation
				0.0f, 1.0f, 0.0f, 0.0f,
				-1.0f, 0.0f, 0.0f, 0.0f,
				0.0f, 0.0f, 1.0f, 0.0f,
				0.0f, 0.0f, 0.0f, 1.0f
				);
			break;

		case DisplayOrientations::LandscapeFlipped:
			rotation = DXGI_MODE_ROTATION_ROTATE180;
			m_orientationTransform2D = 
				Matrix3x2F::Rotation(180.0f) *
				Matrix3x2F::Translation(m_windowBounds.Width, m_windowBounds.Height);
			m_orientationTransform3D = XMFLOAT4X4( // 180-degree Z-rotation
				-1.0f, 0.0f, 0.0f, 0.0f,
				0.0f, -1.0f, 0.0f, 0.0f,
				0.0f, 0.0f, 1.0f, 0.0f,
				0.0f, 0.0f, 0.0f, 1.0f
				);
			break;

		case DisplayOrientations::PortraitFlipped:
			rotation = DXGI_MODE_ROTATION_ROTATE90;
			m_orientationTransform2D = 
				Matrix3x2F::Rotation(90.0f) *
				Matrix3x2F::Translation(m_windowBounds.Height, 0.0f);
			m_orientationTransform3D = XMFLOAT4X4( // 270-degree Z-rotation
				0.0f, -1.0f, 0.0f, 0.0f,
				1.0f, 0.0f, 0.0f, 0.0f,
				0.0f, 0.0f, 1.0f, 0.0f,
				0.0f, 0.0f, 0.0f, 1.0f
				);
			break;

		default:
			throw ref new Platform::FailureException();
	}

	DX::ThrowIfFailed(
		m_swapChain->SetRotation(rotation)
		);

	// Create a Direct3D render target view of the swap chain back buffer.
	ComPtr<ID3D11Texture2D> backBuffer;
	DX::ThrowIfFailed(
		m_swapChain->GetBuffer(0, IID_PPV_ARGS(&backBuffer))
		);

	DX::ThrowIfFailed(
		m_d3dDevice->CreateRenderTargetView(
			backBuffer.Get(),
			nullptr,
			&m_d3dRenderTargetView
			)
		);

	// Create a depth stencil view for use with 3D rendering if needed.
	CD3D11_TEXTURE2D_DESC depthStencilDesc(
		DXGI_FORMAT_D24_UNORM_S8_UINT, 
		static_cast<UINT>(m_d3dRenderTargetSize.Width),
		static_cast<UINT>(m_d3dRenderTargetSize.Height),
		1,
		1,
		D3D11_BIND_DEPTH_STENCIL
		);

	ComPtr<ID3D11Texture2D> depthStencil;
	DX::ThrowIfFailed(
		m_d3dDevice->CreateTexture2D(
			&depthStencilDesc,
			nullptr,
			&depthStencil
			)
		);

	CD3D11_DEPTH_STENCIL_VIEW_DESC depthStencilViewDesc(D3D11_DSV_DIMENSION_TEXTURE2D);
	DX::ThrowIfFailed(
		m_d3dDevice->CreateDepthStencilView(
			depthStencil.Get(),
			&depthStencilViewDesc,
			&m_d3dDepthStencilView
			)
		);

	// Set the 3D rendering viewport to target the entire window.
	CD3D11_VIEWPORT viewport(
		0.0f,
		0.0f,
		m_d3dRenderTargetSize.Width,
		m_d3dRenderTargetSize.Height
		);

	m_d3dContext->RSSetViewports(1, &viewport);

	// Create a Direct2D target bitmap associated with the
	// swap chain back buffer and set it as the current target.
	D2D1_BITMAP_PROPERTIES1 bitmapProperties = 
		BitmapProperties1(
			D2D1_BITMAP_OPTIONS_TARGET | D2D1_BITMAP_OPTIONS_CANNOT_DRAW,
			PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED),
			m_dpi,
			m_dpi
			);

	ComPtr<IDXGISurface> dxgiBackBuffer;
	DX::ThrowIfFailed(
		m_swapChain->GetBuffer(0, IID_PPV_ARGS(&dxgiBackBuffer))
		);

	DX::ThrowIfFailed(
		m_d2dContext->CreateBitmapFromDxgiSurface(
			dxgiBackBuffer.Get(),
			&bitmapProperties,
			&m_d2dTargetBitmap
			)
		);

	m_d2dContext->SetTarget(m_d2dTargetBitmap.Get());

	// Grayscale text anti-aliasing is recommended for all Windows Store apps.
	m_d2dContext->SetTextAntialiasMode(D2D1_TEXT_ANTIALIAS_MODE_GRAYSCALE);
}

// Method to deliver the final image to the display.
void DirectXBase::Present()
{
	// The application may optionally specify "dirty" or "scroll"
	// rects to improve efficiency in certain scenarios.
	DXGI_PRESENT_PARAMETERS parameters = {0};
	parameters.DirtyRectsCount = 0;
	parameters.pDirtyRects = nullptr;
	parameters.pScrollRect = nullptr;
	parameters.pScrollOffset = nullptr;
	
	// The first argument instructs DXGI to block until VSync, putting the application
	// to sleep until the next VSync. This ensures we don't waste any cycles rendering
	// frames that will never be displayed to the screen.
	HRESULT hr = m_swapChain->Present1(1, 0, &parameters);

	// Discard the contents of the render target.
	// This is a valid operation only when the existing contents will be entirely
	// overwritten. If dirty or scroll rects are used, this call should be removed.
	m_d3dContext->DiscardView(m_d3dRenderTargetView.Get());

	// Discard the contents of the depth stencil.
	m_d3dContext->DiscardView(m_d3dDepthStencilView.Get());

	// If the device was removed either by a disconnect or a driver upgrade, we 
	// must recreate all device resources.
	if (hr == DXGI_ERROR_DEVICE_REMOVED)
	{
		HandleDeviceLost();
	}
	else
	{
		DX::ThrowIfFailed(hr);
	}
}

// Method to convert a length in device-independent pixels (DIPs) to a length in physical pixels.
float DirectXBase::ConvertDipsToPixels(float dips)
{
	static const float dipsPerInch = 96.0f;
	return floor(dips * m_dpi / dipsPerInch + 0.5f); // Round to nearest integer.
}


void DirectXBase::ValidateDevice()
{
	ComPtr<IDXGIDevice1> dxgiDevice;
	ComPtr<IDXGIAdapter> deviceAdapter;
	DXGI_ADAPTER_DESC deviceDesc;
	DX::ThrowIfFailed(m_d3dDevice.As(&dxgiDevice));
	DX::ThrowIfFailed(dxgiDevice->GetAdapter(&deviceAdapter));
	DX::ThrowIfFailed(deviceAdapter->GetDesc(&deviceDesc));

	ComPtr<IDXGIFactory2> dxgiFactory;
	ComPtr<IDXGIAdapter1> currentAdapter;
	DXGI_ADAPTER_DESC currentDesc;
	DX::ThrowIfFailed(CreateDXGIFactory1(IID_PPV_ARGS(&dxgiFactory)));
	DX::ThrowIfFailed(dxgiFactory->EnumAdapters1(0, &currentAdapter));
	DX::ThrowIfFailed(currentAdapter->GetDesc(&currentDesc));

	if (deviceDesc.AdapterLuid.LowPart != currentDesc.AdapterLuid.LowPart ||
		deviceDesc.AdapterLuid.HighPart != currentDesc.AdapterLuid.HighPart ||
		FAILED(m_d3dDevice->GetDeviceRemovedReason()))
	{
		dxgiDevice = nullptr;
		deviceAdapter = nullptr;

		HandleDeviceLost();
	}
}