1 files changed, 73 insertions, 0 deletions
diff --git a/extern/openxr/src/loader/runtime_interface.hpp b/extern/openxr/src/loader/runtime_interface.hpp
new file mode 100644
index 00000000000..cb93584f9a0
--- /dev/null
+++ b/extern/openxr/src/loader/runtime_interface.hpp
@@ -0,0 +1,73 @@
+// Copyright (c) 2017-2019 The Khronos Group Inc.
+// Copyright (c) 2017-2019 Valve Corporation
+// Copyright (c) 2017-2019 LunarG, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Author: Mark Young <marky@lunarg.com>
+//
+
+#pragma once
+
+#include "loader_platform.hpp"
+
+#include <openxr/openxr.h>
+
+#include <string>
+#include <vector>
+#include <unordered_map>
+#include <mutex>
+#include <memory>
+
+struct XrGeneratedDispatchTable;
+
+class RuntimeInterface {
+   public:
+    virtual ~RuntimeInterface();
+
+    // Helper functions for loading and unloading the runtime (but only when necessary)
+    static XrResult LoadRuntime(const std::string& openxr_command);
+    static void UnloadRuntime(const std::string& openxr_command);
+    static RuntimeInterface& GetRuntime() { return *(_single_runtime_interface.get()); }
+    static XrResult GetInstanceProcAddr(XrInstance instance, const char* name, PFN_xrVoidFunction* function);
+    static const XrGeneratedDispatchTable* GetDispatchTable(XrInstance instance);
+    static const XrGeneratedDispatchTable* GetDebugUtilsMessengerDispatchTable(XrDebugUtilsMessengerEXT messenger);
+
+    void GetInstanceExtensionProperties(std::vector<XrExtensionProperties>& extension_properties);
+    bool SupportsExtension(const std::string& extension_name);
+    XrResult CreateInstance(const XrInstanceCreateInfo* info, XrInstance* instance);
+    XrResult DestroyInstance(XrInstance instance);
+    bool TrackDebugMessenger(XrInstance instance, XrDebugUtilsMessengerEXT messenger);
+    void ForgetDebugMessenger(XrDebugUtilsMessengerEXT messenger);
+
+    // No default construction
+    RuntimeInterface() = delete;
+
+    // Non-copyable
+    RuntimeInterface(const RuntimeInterface&) = delete;
+    RuntimeInterface& operator=(const RuntimeInterface&) = delete;
+
+   private:
+    RuntimeInterface(LoaderPlatformLibraryHandle runtime_library, PFN_xrGetInstanceProcAddr get_instant_proc_addr);
+    void SetSupportedExtensions(std::vector<std::string>& supported_extensions);
+
+    static std::unique_ptr<RuntimeInterface> _single_runtime_interface;
+    static uint32_t _single_runtime_count;
+    LoaderPlatformLibraryHandle _runtime_library;
+    PFN_xrGetInstanceProcAddr _get_instant_proc_addr;
+    std::unordered_map<XrInstance, std::unique_ptr<XrGeneratedDispatchTable>> _dispatch_table_map;
+    std::mutex _dispatch_table_mutex;
+    std::unordered_map<XrDebugUtilsMessengerEXT, XrInstance> _messenger_to_instance_map;
+    std::mutex _messenger_to_instance_mutex;
+    std::vector<std::string> _supported_extensions;
+};