Initial vulkan context and immediate drawer.

Extremely rough, just checking in so DrChat can snoop.

src/xenia/ui/vulkan/vulkan_device.h

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+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_UI_VULKAN_VULKAN_DEVICE_H_
+#define XENIA_UI_VULKAN_VULKAN_DEVICE_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "xenia/ui/vulkan/vulkan.h"
+#include "xenia/ui/vulkan/vulkan_util.h"
+
+namespace xe {
+namespace ui {
+namespace vulkan {
+
+class VulkanInstance;
+
+// Wrapper and utilities for VkDevice.
+// Prefer passing this around over a VkDevice and casting as needed to call
+// APIs.
+class VulkanDevice {
+ public:
+  VulkanDevice(VulkanInstance* instance);
+  ~VulkanDevice();
+
+  VkDevice handle = nullptr;
+
+  operator VkDevice() const { return handle; }
+  operator VkPhysicalDevice() const { return device_info_.handle; }
+
+  // Declares a layer to verify and enable upon initialization.
+  // Must be called before Initialize.
+  void DeclareRequiredLayer(std::string name, uint32_t min_version,
+                            bool is_optional) {
+    required_layers_.push_back({name, min_version, is_optional});
+  }
+
+  // Declares an extension to verify and enable upon initialization.
+  // Must be called before Initialize.
+  void DeclareRequiredExtension(std::string name, uint32_t min_version,
+                                bool is_optional) {
+    required_extensions_.push_back({name, min_version, is_optional});
+  }
+
+  // Initializes the device, querying and enabling extensions and layers and
+  // preparing the device for general use.
+  // If initialization succeeds it's likely that no more failures beyond runtime
+  // issues will occur.
+  bool Initialize(DeviceInfo device_info);
+
+  uint32_t queue_family_index() const { return queue_family_index_; }
+  VkQueue primary_queue() const { return primary_queue_; }
+  const DeviceInfo& device_info() const { return device_info_; }
+
+  // Allocates memory of the given size matching the required properties.
+  VkDeviceMemory AllocateMemory(
+      const VkMemoryRequirements& requirements,
+      VkFlags required_properties = VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT);
+
+ private:
+  VulkanInstance* instance_ = nullptr;
+
+  std::vector<Requirement> required_layers_;
+  std::vector<Requirement> required_extensions_;
+
+  DeviceInfo device_info_;
+  uint32_t queue_family_index_ = 0;
+  VkQueue primary_queue_ = nullptr;
+};
+
+}  // namespace vulkan
+}  // namespace ui
+}  // namespace xe
+
+#endif  // XENIA_UI_VULKAN_VULKAN_DEVICE_H_