Initial vulkan context and immediate drawer.

Extremely rough, just checking in so DrChat can snoop.

src/xenia/ui/vulkan/vulkan_swap_chain.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_SWAP_CHAIN_H_
+#define XENIA_UI_VULKAN_VULKAN_SWAP_CHAIN_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 VulkanDevice;
+class VulkanInstance;
+
+class VulkanSwapChain {
+ public:
+  VulkanSwapChain(VulkanInstance* instance, VulkanDevice* device);
+  ~VulkanSwapChain();
+
+  VkSwapchainKHR handle = nullptr;
+
+  operator VkSwapchainKHR() const { return handle; }
+
+  uint32_t surface_width() const { return surface_width_; }
+  uint32_t surface_height() const { return surface_height_; }
+
+  // Render pass used for compositing.
+  VkRenderPass render_pass() const { return render_pass_; }
+  // Render command buffer, active inside the render pass from Begin to End.
+  VkCommandBuffer render_cmd_buffer() const { return render_cmd_buffer_; }
+
+  bool Initialize(VkSurfaceKHR surface);
+
+  // Begins the swap operation, preparing state for rendering.
+  bool Begin();
+  // Ends the swap operation, finalizing rendering and presenting the results.
+  bool End();
+
+ private:
+  struct Buffer {
+    VkImage image = nullptr;
+    VkImageView image_view = nullptr;
+    VkFramebuffer framebuffer = nullptr;
+  };
+
+  bool InitializeBuffer(Buffer* buffer, VkImage target_image);
+  void DestroyBuffer(Buffer* buffer);
+
+  VulkanInstance* instance_ = nullptr;
+  VulkanDevice* device_ = nullptr;
+
+  VkSurfaceKHR surface_ = nullptr;
+  uint32_t surface_width_ = 0;
+  uint32_t surface_height_ = 0;
+  VkFormat surface_format_ = VK_FORMAT_UNDEFINED;
+  VkCommandPool cmd_pool_ = nullptr;
+  VkCommandBuffer render_cmd_buffer_ = nullptr;
+  VkRenderPass render_pass_ = nullptr;
+  VkSemaphore image_available_semaphore_ = nullptr;
+  uint32_t current_buffer_index_ = 0;
+  std::vector<Buffer> buffers_;
+};
+
+}  // namespace vulkan
+}  // namespace ui
+}  // namespace xe
+
+#endif  // XENIA_UI_VULKAN_VULKAN_SWAP_CHAIN_H_