1 files changed, 99 insertions, 0 deletions
diff --git a/gfx/vr/FxROutputHandler.cpp b/gfx/vr/FxROutputHandler.cpp
new file mode 100644
index 0000000000..c0f33e1b68
--- /dev/null
+++ b/gfx/vr/FxROutputHandler.cpp
@@ -0,0 +1,99 @@
+/* -*- 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_NTHANDLE | 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<IDXGIResource1> texResource;
+    hr = mTexCopy->QueryInterface(IID_IDXGIResource1,
+                                  getter_AddRefs(texResource));
+    if (hr != S_OK) {
+      return false;
+    }
+
+    hr = texResource->CreateSharedHandle(
+        nullptr, DXGI_SHARED_RESOURCE_READ | DXGI_SHARED_RESOURCE_WRITE,
+        nullptr, &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();
+  }
+}