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//
// Copyright (c) 2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// SwapChainPanelNativeWindow.cpp: NativeWindow for managing ISwapChainPanel native window types.
#include "libANGLE/renderer/d3d/d3d11/winrt/SwapChainPanelNativeWindow.h"
#include <algorithm>
#include <math.h>
using namespace ABI::Windows::Foundation::Collections;
namespace rx
{
SwapChainPanelNativeWindow::~SwapChainPanelNativeWindow()
{
unregisterForSizeChangeEvents();
}
bool SwapChainPanelNativeWindow::initialize(EGLNativeWindowType window, IPropertySet *propertySet)
{
ComPtr<IPropertySet> props = propertySet;
ComPtr<IInspectable> win = window;
SIZE swapChainSize = {};
bool swapChainSizeSpecified = false;
HRESULT result = S_OK;
// IPropertySet is an optional parameter and can be null.
// If one is specified, cache as an IMap and read the properties
// used for initial host initialization.
if (propertySet)
{
result = props.As(&mPropertyMap);
if (SUCCEEDED(result))
{
// The EGLRenderSurfaceSizeProperty is optional and may be missing. The IPropertySet
// was prevalidated to contain the EGLNativeWindowType before being passed to
// this host.
result = GetOptionalSizePropertyValue(mPropertyMap, EGLRenderSurfaceSizeProperty, &swapChainSize, &swapChainSizeSpecified);
}
}
if (SUCCEEDED(result))
{
result = win.As(&mSwapChainPanel);
}
if (SUCCEEDED(result))
{
// If a swapchain size is specfied, then the automatic resize
// behaviors implemented by the host should be disabled. The swapchain
// will be still be scaled when being rendered to fit the bounds
// of the host.
// Scaling of the swapchain output needs to be handled by the
// host for swapchain panels even though the scaling mode setting
// DXGI_SCALING_STRETCH is configured on the swapchain.
if (swapChainSizeSpecified)
{
mClientRect = { 0, 0, swapChainSize.cx, swapChainSize.cy };
// Enable host swapchain scaling
mRequiresSwapChainScaling = true;
}
else
{
result = GetSwapChainPanelSize(mSwapChainPanel, &mClientRect);
}
}
if (SUCCEEDED(result))
{
mNewClientRect = mClientRect;
mClientRectChanged = false;
return registerForSizeChangeEvents();
}
return false;
}
bool SwapChainPanelNativeWindow::registerForSizeChangeEvents()
{
ComPtr<ABI::Windows::UI::Xaml::ISizeChangedEventHandler> sizeChangedHandler;
ComPtr<ABI::Windows::UI::Xaml::IFrameworkElement> frameworkElement;
HRESULT result = Microsoft::WRL::MakeAndInitialize<SwapChainPanelSizeChangedHandler>(sizeChangedHandler.ReleaseAndGetAddressOf(), this->shared_from_this());
if (SUCCEEDED(result))
{
result = mSwapChainPanel.As(&frameworkElement);
}
if (SUCCEEDED(result))
{
result = frameworkElement->add_SizeChanged(sizeChangedHandler.Get(), &mSizeChangedEventToken);
}
if (SUCCEEDED(result))
{
return true;
}
return false;
}
void SwapChainPanelNativeWindow::unregisterForSizeChangeEvents()
{
ComPtr<ABI::Windows::UI::Xaml::IFrameworkElement> frameworkElement;
if (SUCCEEDED(mSwapChainPanel.As(&frameworkElement)))
{
(void)frameworkElement->remove_SizeChanged(mSizeChangedEventToken);
}
mSizeChangedEventToken.value = 0;
}
HRESULT SwapChainPanelNativeWindow::createSwapChain(ID3D11Device *device, DXGIFactory *factory, DXGI_FORMAT format, unsigned int width, unsigned int height, DXGISwapChain **swapChain)
{
if (device == NULL || factory == NULL || swapChain == NULL || width == 0 || height == 0)
{
return E_INVALIDARG;
}
DXGI_SWAP_CHAIN_DESC1 swapChainDesc = { 0 };
swapChainDesc.Width = width;
swapChainDesc.Height = height;
swapChainDesc.Format = format;
swapChainDesc.Stereo = FALSE;
swapChainDesc.SampleDesc.Count = 1;
swapChainDesc.SampleDesc.Quality = 0;
swapChainDesc.BufferUsage = DXGI_USAGE_RENDER_TARGET_OUTPUT | DXGI_USAGE_BACK_BUFFER;
swapChainDesc.BufferCount = 2;
swapChainDesc.SwapEffect = DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL;
swapChainDesc.Scaling = DXGI_SCALING_STRETCH;
swapChainDesc.AlphaMode = DXGI_ALPHA_MODE_IGNORE;
*swapChain = nullptr;
ComPtr<IDXGISwapChain1> newSwapChain;
ComPtr<ISwapChainPanelNative> swapChainPanelNative;
RECT currentPanelSize = {};
HRESULT result = factory->CreateSwapChainForComposition(device, &swapChainDesc, nullptr, newSwapChain.ReleaseAndGetAddressOf());
if (SUCCEEDED(result))
{
result = mSwapChainPanel.As(&swapChainPanelNative);
}
if (SUCCEEDED(result))
{
result = swapChainPanelNative->SetSwapChain(newSwapChain.Get());
}
if (SUCCEEDED(result))
{
// The swapchain panel host requires an instance of the swapchain set on the SwapChainPanel
// to perform the runtime-scale behavior. This swapchain is cached here because there are
// no methods for retreiving the currently configured on from ISwapChainPanelNative.
mSwapChain = newSwapChain;
result = newSwapChain.CopyTo(swapChain);
}
// If the host is responsible for scaling the output of the swapchain, then
// scale it now before returning an instance to the caller. This is done by
// first reading the current size of the swapchain panel, then scaling
if (SUCCEEDED(result) && mRequiresSwapChainScaling)
{
result = GetSwapChainPanelSize(mSwapChainPanel, ¤tPanelSize);
}
// Scale the swapchain to fit inside the contents of the panel.
if (SUCCEEDED(result) && mRequiresSwapChainScaling)
{
SIZE currentSize = { currentPanelSize.right, currentPanelSize.bottom };
result = scaleSwapChain(currentSize);
}
if (SUCCEEDED(result))
{
// If automatic swapchain resize behaviors have been disabled, then
// unregister for the resize change events.
if (mSupportsSwapChainResize == false)
{
unregisterForSizeChangeEvents();
}
}
return result;
}
HRESULT SwapChainPanelNativeWindow::scaleSwapChain(const SIZE &newSize)
{
ABI::Windows::Foundation::Size renderScale = { (float)newSize.cx/(float)mClientRect.right, (float)newSize.cy/(float)mClientRect.bottom };
// Setup a scale matrix for the swap chain
DXGI_MATRIX_3X2_F scaleMatrix = {};
scaleMatrix._11 = renderScale.Width;
scaleMatrix._22 = renderScale.Height;
ComPtr<IDXGISwapChain2> swapChain2;
HRESULT result = mSwapChain.As(&swapChain2);
if (SUCCEEDED(result))
{
result = swapChain2->SetMatrixTransform(&scaleMatrix);
}
return result;
}
HRESULT GetSwapChainPanelSize(const ComPtr<ABI::Windows::UI::Xaml::Controls::ISwapChainPanel> &swapChainPanel, RECT *windowSize)
{
ComPtr<ABI::Windows::UI::Xaml::IUIElement> uiElement;
ABI::Windows::Foundation::Size renderSize = { 0, 0 };
HRESULT result = swapChainPanel.As(&uiElement);
if (SUCCEEDED(result))
{
result = uiElement->get_RenderSize(&renderSize);
}
if (SUCCEEDED(result))
{
*windowSize = { 0, 0, lround(renderSize.Width), lround(renderSize.Height) };
}
return result;
}
}
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