1 files changed, 77 insertions, 0 deletions
diff --git a/thirdparty/openxr/src/loader/loader_instance.hpp b/thirdparty/openxr/src/loader/loader_instance.hpp
new file mode 100644
index 0000000000..1d43ed758d
--- /dev/null
+++ b/thirdparty/openxr/src/loader/loader_instance.hpp
@@ -0,0 +1,77 @@
+// Copyright (c) 2017-2022, The Khronos Group Inc.
+// Copyright (c) 2017-2019 Valve Corporation
+// Copyright (c) 2017-2019 LunarG, Inc.
+//
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+//
+// Initial Author: Mark Young <marky@lunarg.com>
+//
+
+#pragma once
+
+#include "extra_algorithms.h"
+#include "loader_interfaces.h"
+
+#include <openxr/openxr.h>
+
+#include <array>
+#include <cmath>
+#include <memory>
+#include <mutex>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+class ApiLayerInterface;
+struct XrGeneratedDispatchTable;
+class LoaderInstance;
+
+// Manage the single loader instance that is available.
+namespace ActiveLoaderInstance {
+// Set the active loader instance. This will fail if there is already an active loader instance.
+XrResult Set(std::unique_ptr<LoaderInstance> loader_instance, const char* log_function_name);
+
+// Returns true if there is an active loader instance.
+bool IsAvailable();
+
+// Get the active LoaderInstance.
+XrResult Get(LoaderInstance** loader_instance, const char* log_function_name);
+
+// Destroy the currently active LoaderInstance if there is one. This will make the loader able to create a new XrInstance if needed.
+void Remove();
+};  // namespace ActiveLoaderInstance
+
+// Manages information needed by the loader for an XrInstance, such as what extensions are available and the dispatch table.
+class LoaderInstance {
+   public:
+    // Factory method
+    static XrResult CreateInstance(PFN_xrGetInstanceProcAddr get_instance_proc_addr_term, PFN_xrCreateInstance create_instance_term,
+                                   PFN_xrCreateApiLayerInstance create_api_layer_instance_term,
+                                   std::vector<std::unique_ptr<ApiLayerInterface>> layer_interfaces,
+                                   const XrInstanceCreateInfo* createInfo, std::unique_ptr<LoaderInstance>* loader_instance);
+    static const std::array<XrExtensionProperties, 1>& LoaderSpecificExtensions();
+
+    virtual ~LoaderInstance();
+
+    XrInstance GetInstanceHandle() { return _runtime_instance; }
+    const std::unique_ptr<XrGeneratedDispatchTable>& DispatchTable() { return _dispatch_table; }
+    std::vector<std::unique_ptr<ApiLayerInterface>>& LayerInterfaces() { return _api_layer_interfaces; }
+    bool ExtensionIsEnabled(const std::string& extension);
+    XrDebugUtilsMessengerEXT DefaultDebugUtilsMessenger() { return _messenger; }
+    void SetDefaultDebugUtilsMessenger(XrDebugUtilsMessengerEXT messenger) { _messenger = messenger; }
+    XrResult GetInstanceProcAddr(const char* name, PFN_xrVoidFunction* function);
+
+   private:
+    LoaderInstance(XrInstance instance, const XrInstanceCreateInfo* createInfo, PFN_xrGetInstanceProcAddr topmost_gipa,
+                   std::vector<std::unique_ptr<ApiLayerInterface>> api_layer_interfaces);
+
+   private:
+    XrInstance _runtime_instance{XR_NULL_HANDLE};
+    PFN_xrGetInstanceProcAddr _topmost_gipa{nullptr};
+    std::vector<std::string> _enabled_extensions;
+    std::vector<std::unique_ptr<ApiLayerInterface>> _api_layer_interfaces;
+
+    std::unique_ptr<XrGeneratedDispatchTable> _dispatch_table;
+    // Internal debug messenger created during xrCreateInstance
+    XrDebugUtilsMessengerEXT _messenger{XR_NULL_HANDLE};
+};