[D3D12] Move fences to a separate class, get rid of Vulkan provider

src/xenia/ui/d3d12/cpu_fence.cc

@@ -0,0 +1,75 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2018 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#include "xenia/ui/d3d12/cpu_fence.h"
+
+#include "xenia/base/logging.h"
+
+namespace xe {
+namespace ui {
+namespace d3d12 {
+
+std::unique_ptr<CPUFence>
+CPUFence::Create(ID3D12Device* device, ID3D12CommandQueue* queue) {
+  std::unique_ptr<CPUFence> fence(new CPUFence(device, queue));
+  if (!fence->Initialize()) {
+    return nullptr;
+  }
+  return fence;
+}
+
+CPUFence::CPUFence(ID3D12Device* device, ID3D12CommandQueue* queue)
+    : device_(device), queue_(queue) {}
+
+CPUFence::~CPUFence() {
+  // First destroying the fence because it may reference the event.
+  if (fence_ != nullptr) {
+    fence_->Release();
+  }
+  if (completion_event_ != nullptr) {
+    CloseHandle(completion_event_);
+  }
+}
+
+bool CPUFence::Initialize() {
+  if (FAILED(device_->CreateFence(0, D3D12_FENCE_FLAG_NONE,
+                                  IID_PPV_ARGS(&fence_)))) {
+    XELOGE("Failed to create a Direct3D fence");
+    return false;
+  }
+  completion_event_ = CreateEvent(nullptr, false, false, nullptr);
+  if (completion_event_ == nullptr) {
+    XELOGE("Failed to create a fence completion event");
+    fence_->Release();
+    fence_ = nullptr;
+    return false;
+  }
+  queued_value_ = 0;
+  return true;
+}
+
+void CPUFence::Enqueue() {
+  ++queued_value_;
+  queue_->Signal(fence_, queued_value_);
+}
+
+bool CPUFence::IsCompleted() {
+  return fence_->GetCompletedValue() >= queued_value_;
+}
+
+void CPUFence::Await() {
+  if (fence_->GetCompletedValue() < queued_value_) {
+    fence_->SetEventOnCompletion(queued_value_, completion_event_);
+    WaitForSingleObject(completion_event_, INFINITE);
+  }
+}
+
+}  // namespace d3d12
+}  // namespace ui
+}  // namespace xe