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97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#include "FxROutputHandler.h"
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#include "mozilla/Assertions.h"
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#include "moz_external_vr.h"
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#include "VRShMem.h"
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// TryInitialize is responsible for associating this output handler with the
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// calling window's swapchain for subsequent updates. This also creates a
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// texture that can be shared across processes and updates VRShMem with the
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// shared texture handle.
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// See nsFxrCommandLineHandler::Handle for more information about the
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// bootstrap process.
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bool FxROutputHandler::TryInitialize(IDXGISwapChain* aSwapChain,
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ID3D11Device* aDevice) {
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if (mSwapChain == nullptr) {
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RefPtr<ID3D11Texture2D> texOrig = nullptr;
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HRESULT hr =
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aSwapChain->GetBuffer(0, IID_ID3D11Texture2D, getter_AddRefs(texOrig));
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if (hr != S_OK) {
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return false;
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}
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// Create shareable texture, which will be copied to
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D3D11_TEXTURE2D_DESC descOrig = {0};
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texOrig->GetDesc(&descOrig);
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descOrig.MiscFlags |= D3D11_RESOURCE_MISC_SHARED;
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hr = aDevice->CreateTexture2D(&descOrig, nullptr,
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mTexCopy.StartAssignment());
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if (hr != S_OK) {
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return false;
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}
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// Now, share the texture to a handle that can be marshaled to another
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// process
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HANDLE hCopy = nullptr;
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RefPtr<IDXGIResource> texResource;
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hr = mTexCopy->QueryInterface(IID_IDXGIResource,
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getter_AddRefs(texResource));
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if (hr != S_OK) {
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return false;
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}
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hr = texResource->GetSharedHandle(&hCopy);
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if (hr != S_OK) {
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return false;
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}
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// The texture is successfully created and shared, so cache a
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// pointer to the swapchain to indicate this success.
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mSwapChain = aSwapChain;
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// Finally, marshal the shared texture handle via 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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// The CLH should have populated hwndFx first
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MOZ_ASSERT(windowState.hwndFx != 0);
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MOZ_ASSERT(windowState.textureFx == nullptr);
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windowState.textureFx = (HANDLE)hCopy;
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shmem.PushWindowState(windowState);
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shmem.LeaveShMem();
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// Notify the waiting host process that the data is now available
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HANDLE hSignal = ::OpenEventA(EVENT_ALL_ACCESS, // dwDesiredAccess
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FALSE, // bInheritHandle
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windowState.signalName // lpName
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);
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::SetEvent(hSignal);
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::CloseHandle(hSignal);
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}
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} else {
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MOZ_ASSERT(aSwapChain == mSwapChain);
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}
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return mSwapChain != nullptr && aSwapChain == mSwapChain;
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}
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// Update the contents of the shared texture.
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void FxROutputHandler::UpdateOutput(ID3D11DeviceContext* aCtx) {
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MOZ_ASSERT(mSwapChain != nullptr);
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ID3D11Texture2D* texOrig = nullptr;
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HRESULT hr = mSwapChain->GetBuffer(0, IID_PPV_ARGS(&texOrig));
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if (hr == S_OK) {
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aCtx->CopyResource(mTexCopy, texOrig);
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texOrig->Release();
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}
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}
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