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a7ea9dae63
This change introduces plumbing for communicating with the GPU process through VRShMem while bootstrapping Firefox for creating a window with Firefox Reality. Test impact shows a fabricated value returned for the texture handle in VRShMem. Differential Revision: https://phabricator.services.mozilla.com/D41383 --HG-- extra : moz-landing-system : lando
117 lines
4.5 KiB
C++
117 lines
4.5 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:tabstop=4:expandtab:shiftwidth=4:
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef XP_WIN
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# error "nsFxrCommandLineHandler currently only supported on Windows"
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#endif
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#include "nsFxrCommandLineHandler.h"
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#include "nsICommandLine.h"
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#include "nsIWindowWatcher.h"
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#include "mozIDOMWindow.h"
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#include "nsPIDOMWindow.h"
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#include "mozilla/WidgetUtils.h"
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#include "nsIWidget.h"
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#include "nsServiceManagerUtils.h"
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#include "nsString.h"
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#include "nsArray.h"
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#include "nsCOMPtr.h"
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#include "windows.h"
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#include "WinUtils.h"
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#include "VRShMem.h"
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NS_IMPL_ISUPPORTS(nsFxrCommandLineHandler, nsICommandLineHandler)
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// nsFxrCommandLineHandler acts in the middle of bootstrapping Firefox
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// Reality with desktop Firefox. Details of the processes involved are
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// described below:
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//
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// Host
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// (vrhost!CreateVRWindow) Fx Main Fx GPU
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// | + +
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// VRShMem creates shared + +
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// memory in OS + +
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// | + +
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// Launch firefox.exe + +
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// with --fxr + +
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// | | +
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// Wait for Signal... nsFxrCLH handles param +
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// | joins VRShMem +
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// | creates new window |
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// | sets .hwndFx in VRShMem |
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// | | |
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// | | After compositor and
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// | | swapchain created,
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// | | share texture handle to
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// | | VRShMem and set signal
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// CreateVRWindow returns | |
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// to host | |
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// | | |
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//
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NS_IMETHODIMP
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nsFxrCommandLineHandler::Handle(nsICommandLine* aCmdLine) {
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bool handleFlagRetVal = false;
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nsresult result =
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aCmdLine->HandleFlag(NS_LITERAL_STRING("fxr"), false, &handleFlagRetVal);
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if (result == NS_OK && handleFlagRetVal) {
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aCmdLine->SetPreventDefault(true);
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nsCOMPtr<nsIWindowWatcher> wwatch =
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do_GetService(NS_WINDOWWATCHER_CONTRACTID);
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NS_ENSURE_TRUE(wwatch, NS_ERROR_FAILURE);
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nsCOMPtr<mozIDOMWindowProxy> newWindow;
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result = wwatch->OpenWindow(nullptr, // aParent
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"chrome://fxr/content/fxrui.html", // aUrl
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"_blank", // aName
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"chrome,dialog=no,all", // aFeatures
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nullptr, // aArguments
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getter_AddRefs(newWindow));
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MOZ_ASSERT(result == NS_OK);
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// Send the window's HWND to vrhost through VRShMem
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mozilla::gfx::VRShMem shmem(nullptr, true /*aRequiresMutex*/);
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if (shmem.JoinShMem()) {
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mozilla::gfx::VRWindowState windowState = {0};
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shmem.PullWindowState(windowState);
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nsCOMPtr<nsIWidget> newWidget =
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mozilla::widget::WidgetUtils::DOMWindowToWidget(
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nsPIDOMWindowOuter::From(newWindow));
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HWND hwndWidget = (HWND)newWidget->GetNativeData(NS_NATIVE_WINDOW);
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// The CLH should populate these members first
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MOZ_ASSERT(windowState.hwndFx == 0);
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MOZ_ASSERT(windowState.textureFx == nullptr);
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windowState.hwndFx = (uint64_t)hwndWidget;
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shmem.PushWindowState(windowState);
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shmem.LeaveShMem();
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// The GPU process will notify the host that window creation is complete
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// after output data is set in VRShMem
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newWidget->RequestFxrOutput();
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} else {
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MOZ_CRASH("failed to start with --fxr");
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}
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsFxrCommandLineHandler::GetHelpInfo(nsACString& aResult) {
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aResult.AssignLiteral(
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" --fxr Creates a new window for Firefox Reality on Desktop when "
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"available\n");
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return NS_OK;
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}
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