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-rw-r--r--gfx/vr/FxROutputHandler.cpp96
1 files changed, 96 insertions, 0 deletions
diff --git a/gfx/vr/FxROutputHandler.cpp b/gfx/vr/FxROutputHandler.cpp
new file mode 100644
index 0000000000..3bf2fb62ce
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+++ b/gfx/vr/FxROutputHandler.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "FxROutputHandler.h"
+#include "mozilla/Assertions.h"
+#include "moz_external_vr.h"
+#include "VRShMem.h"
+
+// TryInitialize is responsible for associating this output handler with the
+// calling window's swapchain for subsequent updates. This also creates a
+// texture that can be shared across processes and updates VRShMem with the
+// shared texture handle.
+// See nsFxrCommandLineHandler::Handle for more information about the
+// bootstrap process.
+bool FxROutputHandler::TryInitialize(IDXGISwapChain* aSwapChain,
+ ID3D11Device* aDevice) {
+ if (mSwapChain == nullptr) {
+ RefPtr<ID3D11Texture2D> texOrig = nullptr;
+ HRESULT hr =
+ aSwapChain->GetBuffer(0, IID_ID3D11Texture2D, getter_AddRefs(texOrig));
+ if (hr != S_OK) {
+ return false;
+ }
+
+ // Create shareable texture, which will be copied to
+ D3D11_TEXTURE2D_DESC descOrig = {0};
+ texOrig->GetDesc(&descOrig);
+ descOrig.MiscFlags |= D3D11_RESOURCE_MISC_SHARED;
+ hr = aDevice->CreateTexture2D(&descOrig, nullptr,
+ mTexCopy.StartAssignment());
+ if (hr != S_OK) {
+ return false;
+ }
+
+ // Now, share the texture to a handle that can be marshaled to another
+ // process
+ HANDLE hCopy = nullptr;
+ RefPtr<IDXGIResource> texResource;
+ hr = mTexCopy->QueryInterface(IID_IDXGIResource,
+ getter_AddRefs(texResource));
+ if (hr != S_OK) {
+ return false;
+ }
+
+ hr = texResource->GetSharedHandle(&hCopy);
+ if (hr != S_OK) {
+ return false;
+ }
+
+ // The texture is successfully created and shared, so cache a
+ // pointer to the swapchain to indicate this success.
+ mSwapChain = aSwapChain;
+
+ // Finally, marshal the shared texture handle via VRShMem
+ mozilla::gfx::VRShMem shmem(nullptr, true /*aRequiresMutex*/);
+ if (shmem.JoinShMem()) {
+ mozilla::gfx::VRWindowState windowState = {0};
+ shmem.PullWindowState(windowState);
+
+ // The CLH should have populated hwndFx first
+ MOZ_ASSERT(windowState.hwndFx != 0);
+ MOZ_ASSERT(windowState.textureFx == nullptr);
+
+ windowState.textureFx = (HANDLE)hCopy;
+
+ shmem.PushWindowState(windowState);
+ shmem.LeaveShMem();
+
+ // Notify the waiting host process that the data is now available
+ HANDLE hSignal = ::OpenEventA(EVENT_ALL_ACCESS, // dwDesiredAccess
+ FALSE, // bInheritHandle
+ windowState.signalName // lpName
+ );
+ ::SetEvent(hSignal);
+ ::CloseHandle(hSignal);
+ }
+ } else {
+ MOZ_ASSERT(aSwapChain == mSwapChain);
+ }
+
+ return mSwapChain != nullptr && aSwapChain == mSwapChain;
+}
+
+// Update the contents of the shared texture.
+void FxROutputHandler::UpdateOutput(ID3D11DeviceContext* aCtx) {
+ MOZ_ASSERT(mSwapChain != nullptr);
+
+ ID3D11Texture2D* texOrig = nullptr;
+ HRESULT hr = mSwapChain->GetBuffer(0, IID_PPV_ARGS(&texOrig));
+ if (hr == S_OK) {
+ aCtx->CopyResource(mTexCopy, texOrig);
+ texOrig->Release();
+ }
+}