#include "SDLmain_WinRT_common.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(CoreWindow^ window)

{

m_window = window;

CreateDeviceResources();

CreateWindowSizeDependentResources();

}

// Recreate all device resources and set them back to the current state.

void Direct3DBase::HandleDeviceLost()

{

// Reset these member variables to ensure that UpdateForWindowSizeChange recreates all resources.

m_windowBounds.Width = 0;

m_windowBounds.Height = 0;

m_swapChain = nullptr;

CreateDeviceResources();

UpdateForWindowSizeChange();

}

// 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,

D3D_FEATURE_LEVEL_9_2,

D3D_FEATURE_LEVEL_9_1

};

// 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 for Windows Store apps.

&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 change on a window SizeChanged event.

void Direct3DBase::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_renderTargetSize.Width = swapDimensions ? windowHeight : windowWidth;

m_renderTargetSize.Height = swapDimensions ? windowWidth : windowHeight;

if(m_swapChain != nullptr)

{

// If the swap chain already exists, resize it.

DX::ThrowIfFailed(

m_swapChain->ResizeBuffers(

2, // Double-buffered swap chain.

static_cast<UINT>(m_renderTargetSize.Width),

static_cast<UINT>(m_renderTargetSize.Height),

DXGI_FORMAT_B8G8R8A8_UNORM,

0

)

);

}

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_renderTargetSize.Width); // Match the size of the window.

swapChainDesc.Height = static_cast<UINT>(m_renderTargetSize.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_NONE;

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(

__uuidof(IDXGIFactory2),

&dxgiFactory

)

);

Windows::UI::Core::CoreWindow^ window = m_window.Get();

DX::ThrowIfFailed(

dxgiFactory->CreateSwapChainForCoreWindow(

m_d3dDevice.Get(),

reinterpret_cast<IUnknown*>(window),

&swapChainDesc,

nullptr, // Allow on all displays.

&m_swapChain

)

);

// 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 the

// 3D matrix transformation for rendering to the rotated swap chain.

DXGI_MODE_ROTATION rotation = DXGI_MODE_ROTATION_UNSPECIFIED;

switch (m_orientation)

{

case DisplayOrientations::Landscape:

rotation = DXGI_MODE_ROTATION_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_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_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_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 render target view of the swap chain back buffer.

ComPtr<ID3D11Texture2D> backBuffer;

DX::ThrowIfFailed(

m_swapChain->GetBuffer(

0,

__uuidof(ID3D11Texture2D),

&backBuffer

)

);

DX::ThrowIfFailed(

m_d3dDevice->CreateRenderTargetView(

backBuffer.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);

}

// This method is called in the event handler for the SizeChanged event.

void Direct3DBase::UpdateForWindowSizeChange()

{

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_renderTargetView = nullptr;

m_depthStencilView = nullptr;

m_d3dContext->Flush();

CreateWindowSizeDependentResources();

}

}

// Method to deliver the final image to the display.

void Direct3DBase::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_renderTargetView.Get());

// Discard the contents of the depth stencil.

m_d3dContext->DiscardView(m_depthStencilView.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 Direct3DBase::ConvertDipsToPixels(float dips)

{

static const float dipsPerInch = 96.0f;

return floor(dips * DisplayProperties::LogicalDpi / dipsPerInch + 0.5f); // Round to nearest integer.

}