Initial vulkan context and immediate drawer.

Extremely rough, just checking in so DrChat can snoop.

src/xenia/ui/vulkan/vulkan_instance.h

@@ -0,0 +1,95 @@
+/**
+ ******************************************************************************
+ * 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_INSTANCE_H_
+#define XENIA_UI_VULKAN_VULKAN_INSTANCE_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "xenia/ui/vulkan/vulkan.h"
+#include "xenia/ui/vulkan/vulkan_util.h"
+#include "xenia/ui/window.h"
+
+namespace xe {
+namespace ui {
+namespace vulkan {
+
+// Wrappers and utilities for VkInstance.
+class VulkanInstance {
+ public:
+  VulkanInstance();
+  ~VulkanInstance();
+
+  VkInstance handle = nullptr;
+
+  operator VkInstance() const { return 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 instance, querying and enabling extensions and layers and
+  // preparing the instance for general use.
+  // If initialization succeeds it's likely that no more failures beyond runtime
+  // issues will occur.
+  // TODO(benvanik): remove need for any_target_window - it's just for queries.
+  bool Initialize(Window* any_target_window);
+
+  // Returns a list of all available devices as detected during initialization.
+  const std::vector<DeviceInfo>& available_devices() const {
+    return available_devices_;
+  }
+
+ private:
+  // Queries the system to find global extensions and layers.
+  bool QueryGlobals();
+
+  // Creates the instance, enabling required extensions and layers.
+  bool CreateInstance();
+  void DestroyInstance();
+
+  // Enables debugging info and callbacks for supported layers.
+  void EnableDebugValidation();
+  void DisableDebugValidation();
+
+  // Queries all available physical devices.
+  bool QueryDevices(Window* any_target_window);
+
+  void DumpLayers(const std::vector<LayerInfo>& layers, const char* indent);
+  void DumpExtensions(const std::vector<VkExtensionProperties>& extensions,
+                      const char* indent);
+  void DumpDeviceInfo(const DeviceInfo& device_info);
+
+  std::vector<Requirement> required_layers_;
+  std::vector<Requirement> required_extensions_;
+
+  std::vector<LayerInfo> global_layers_;
+  std::vector<VkExtensionProperties> global_extensions_;
+  std::vector<DeviceInfo> available_devices_;
+
+  VkDebugReportCallbackEXT dbg_report_callback_ = nullptr;
+};
+
+}  // namespace vulkan
+}  // namespace ui
+}  // namespace xe
+
+#endif  // XENIA_UI_VULKAN_VULKAN_INSTANCE_H_