#include <fstream>

#include <string>

#include <vector>

#include "SDLmain_WinRT_common.h"

using namespace DirectX;

using namespace Microsoft::WRL;

using namespace Windows::Foundation;

using namespace Windows::Graphics::Display;

{

}

SDL_winrtrenderer::~SDL_winrtrenderer()

{

if (m_mainTextureHelperSurface) {

SDL_FreeSurface(m_mainTextureHelperSurface);

m_mainTextureHelperSurface = NULL;

}

}

// Initialize the Direct3D resources required to run.

void SDL_winrtrenderer::Initialize(CoreWindow^ window)

{

m_window = window;

CreateDeviceResources();

CreateWindowSizeDependentResources();

}

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

void SDL_winrtrenderer::HandleDeviceLost()

{

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

m_windowBounds.Width = 0;

m_windowBounds.Height = 0;

CreateDeviceResources();

UpdateForWindowSizeChange();

}

}

// Allocate all memory resources that change on a window SizeChanged event.

void SDL_winrtrenderer::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 the swap chain already exists, resize it.

DX::ThrowIfFailed(

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.

#if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP

swapChainDesc.Scaling = DXGI_SCALING_STRETCH; // On phone, only stretch and aspect-ratio stretch scaling are allowed.

swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_DISCARD; // On phone, no swap effects are supported.

#else

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(

);

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(

reinterpret_cast<IUnknown*>(window),

&swapChainDesc,

nullptr, // Allow on all displays.

)

);

// 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();

}

#if WINAPI_FAMILY != WINAPI_FAMILY_PHONE_APP

// TODO, WinRT: Windows Phone does not have the IDXGISwapChain1::SetRotation method. Check if an alternative is available, or needed.

// Create a render target view of the swap chain back buffer.

ComPtr<ID3D11Texture2D> backBuffer;

DX::ThrowIfFailed(

0,

__uuidof(ID3D11Texture2D),

&backBuffer

)

);

DX::ThrowIfFailed(

backBuffer.Get(),

nullptr,

)

);

// 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(

&depthStencilDesc,

nullptr,

&depthStencil

)

);

// Set the rendering viewport to target the entire window.

CD3D11_VIEWPORT viewport(

0.0f,

0.0f,

m_renderTargetSize.Width,

m_renderTargetSize.Height

);

}

void SDL_winrtrenderer::ResizeMainTexture(int w, int h)

{

const int pixelSizeInBytes = 4;

textureDesc.Width = w;

textureDesc.Height = h;

textureDesc.MipLevels = 1;

textureDesc.ArraySize = 1;

textureDesc.Format = DXGI_FORMAT_B8G8R8X8_UNORM;

textureDesc.SampleDesc.Count = 1;

textureDesc.SampleDesc.Quality = 0;

textureDesc.Usage = D3D11_USAGE_DYNAMIC;

textureDesc.BindFlags = D3D11_BIND_SHADER_RESOURCE;

textureDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;

textureDesc.MiscFlags = 0;

const int numPixels = textureDesc.Width * textureDesc.Height;

std::vector<uint8> initialTexturePixels(numPixels * pixelSizeInBytes, 0x00);

// Fill the texture with a non-black color, for debugging purposes:

//for (int i = 0; i < (numPixels * pixelSizeInBytes); i += pixelSizeInBytes) {

// initialTexturePixels[i+0] = 0xff;

// initialTexturePixels[i+1] = 0xff;

// initialTexturePixels[i+2] = 0x00;

// initialTexturePixels[i+3] = 0xff;

//}

D3D11_SUBRESOURCE_DATA initialTextureData = {0};

initialTextureData.pSysMem = (void *)&(initialTexturePixels[0]);

initialTextureData.SysMemPitch = textureDesc.Width * pixelSizeInBytes;

initialTextureData.SysMemSlicePitch = numPixels * pixelSizeInBytes;

DX::ThrowIfFailed(

&textureDesc,

&initialTextureData,

)

);

if (m_mainTextureHelperSurface) {

SDL_FreeSurface(m_mainTextureHelperSurface);

m_mainTextureHelperSurface = NULL;

}

m_mainTextureHelperSurface = SDL_CreateRGBSurfaceFrom(

NULL,

textureDesc.Width, textureDesc.Height,

(pixelSizeInBytes * 8),

0, // Use an nil pitch for now. This'll be filled in when updating the texture.

0x00ff0000, 0x0000ff00, 0x000000ff, 0x00000000); // TODO, WinRT: calculate masks given the Direct3D-defined pixel format of the texture

if (m_mainTextureHelperSurface == NULL) {

DX::ThrowIfFailed(E_FAIL); // TODO, WinRT: generate a better error here, taking into account who's calling this function.

}

D3D11_SHADER_RESOURCE_VIEW_DESC resourceViewDesc;

resourceViewDesc.Format = textureDesc.Format;

resourceViewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;

resourceViewDesc.Texture2D.MostDetailedMip = 0;

resourceViewDesc.Texture2D.MipLevels = textureDesc.MipLevels;

DX::ThrowIfFailed(

m_sdlRendererData->d3dDevice->CreateShaderResourceView(

m_sdlRendererData->mainTexture.Get(),

}

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

void SDL_winrtrenderer::UpdateForWindowSizeChange()

{

if (m_window->Bounds.Width != m_windowBounds.Width ||

m_window->Bounds.Height != m_windowBounds.Height ||

m_orientation != DisplayProperties::CurrentOrientation)

{

ID3D11RenderTargetView* nullViews[] = {nullptr};

m_sdlRendererData->d3dContext->OMSetRenderTargets(ARRAYSIZE(nullViews), nullViews, nullptr);

m_sdlRendererData->renderTargetView = nullptr;

m_sdlRendererData->d3dContext->Flush();

CreateWindowSizeDependentResources();

}

}

m_sdlRendererData->d3dContext->ClearRenderTargetView(

m_sdlRendererData->renderTargetView.Get(),

blackColor

);

// Only draw the screen once it is loaded (some loading is asynchronous).

{

return;

}

{

return;

}

D3D11_MAPPED_SUBRESOURCE textureMemory = {0};

DX::ThrowIfFailed(

m_sdlRendererData->d3dContext->Map(

m_sdlRendererData->mainTexture.Get(),

0,

D3D11_MAP_WRITE_DISCARD,

0,

&textureMemory)

);

// Copy pixel data to the locked texture's memory:

m_mainTextureHelperSurface->pixels = textureMemory.pData;

m_mainTextureHelperSurface->pitch = textureMemory.RowPitch;

SDL_BlitSurface(surface, NULL, m_mainTextureHelperSurface, NULL);

// Clean up a bit, then commit the texture's memory back to Direct3D:

m_mainTextureHelperSurface->pixels = NULL;

m_mainTextureHelperSurface->pitch = 0;

m_sdlRendererData->d3dContext->Unmap(

m_sdlRendererData->mainTexture.Get(),

0);

nullptr

);

UINT stride = sizeof(VertexPositionColor);

UINT offset = 0;

0,

1,

&stride,

&offset

);

m_sdlRendererData->d3dContext->VSSetShader(

m_sdlRendererData->vertexShader.Get(),

nullptr,

0

);

m_sdlRendererData->d3dContext->PSSetShader(

m_sdlRendererData->pixelShader.Get(),

nullptr,

0

);

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

void SDL_winrtrenderer::Present()

{

}

// Method to convert a length in device-independent pixels (DIPs) to a length in physical pixels.

float SDL_winrtrenderer::ConvertDipsToPixels(float dips)

{

static const float dipsPerInch = 96.0f;

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