opencv/samples/wp8/OcvImageManipulation/PhoneXamlDirect3DApp1/PhoneXamlDirect3DApp1Comp/Direct3DBase.cpp

#include "pch.h"
#include "Direct3DBase.h"

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

// Constructor.
Direct3DBase::Direct3DBase()
{
}

// Initialize the Direct3D resources required to run.
void Direct3DBase::Initialize()
{
	CreateDeviceResources();
}

// These are the resources that depend on the device.
void Direct3DBase::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;

#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
	};

	// Create the Direct3D 11 API device object and a corresponding context.
	ComPtr<ID3D11Device> device;
	ComPtr<ID3D11DeviceContext> context;
	DX::ThrowIfFailed(
		D3D11CreateDevice(
			nullptr, // Specify nullptr to use the default adapter.
			D3D_DRIVER_TYPE_HARDWARE,
			nullptr,
			creationFlags, // Set 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.
			&device, // Returns the Direct3D device created.
			&m_featureLevel, // Returns feature level of device created.
			&context // Returns the device immediate context.
			)
		);

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

	DX::ThrowIfFailed(
		context.As(&m_d3dContext)
		);
}

// Allocate all memory resources that depend on the window size.
void Direct3DBase::CreateWindowSizeDependentResources()
{
	// Create a descriptor for the render target buffer.
	CD3D11_TEXTURE2D_DESC renderTargetDesc(
		DXGI_FORMAT_B8G8R8A8_UNORM,
		static_cast<UINT>(m_renderTargetSize.Width),
		static_cast<UINT>(m_renderTargetSize.Height),
		1,
		1,
		D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE
		);
	renderTargetDesc.MiscFlags = D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX | D3D11_RESOURCE_MISC_SHARED_NTHANDLE;

	// Allocate a 2-D surface as the render target buffer.
	DX::ThrowIfFailed(
		m_d3dDevice->CreateTexture2D(
			&renderTargetDesc,
			nullptr,
			&m_renderTarget
			)
		);

	DX::ThrowIfFailed(
		m_d3dDevice->CreateRenderTargetView(
			m_renderTarget.Get(),
			nullptr,
			&m_renderTargetView
			)
		);

	// Create a depth stencil view.
	CD3D11_TEXTURE2D_DESC depthStencilDesc(
		DXGI_FORMAT_D24_UNORM_S8_UINT,
		static_cast<UINT>(m_renderTargetSize.Width),
		static_cast<UINT>(m_renderTargetSize.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_depthStencilView
			)
		);

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

	m_d3dContext->RSSetViewports(1, &viewport);
}

void Direct3DBase::UpdateForRenderResolutionChange(float width, float height)
{
	m_renderTargetSize.Width = width;
	m_renderTargetSize.Height = height;

	ID3D11RenderTargetView* nullViews[] = {nullptr};
	m_d3dContext->OMSetRenderTargets(ARRAYSIZE(nullViews), nullViews, nullptr);
	m_renderTarget = nullptr;
	m_renderTargetView = nullptr;
	m_depthStencilView = nullptr;
	m_d3dContext->Flush();
	CreateWindowSizeDependentResources();
}

void Direct3DBase::UpdateForWindowSizeChange(float width, float height)
{
	m_windowBounds.Width  = width;
	m_windowBounds.Height = height;
}