1 files changed, 84 insertions, 0 deletions
diff --git a/thirdparty/openxr/src/loader/runtime_interface.hpp b/thirdparty/openxr/src/loader/runtime_interface.hpp
new file mode 100644
index 0000000000..5f49b28abe
--- /dev/null
+++ b/thirdparty/openxr/src/loader/runtime_interface.hpp
@@ -0,0 +1,84 @@
+// 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 "loader_platform.hpp"
+
+#include <openxr/openxr.h>
+
+#include <string>
+#include <vector>
+#include <unordered_map>
+#include <mutex>
+#include <memory>
+
+#ifdef XR_USE_PLATFORM_ANDROID
+#define XR_KHR_LOADER_INIT_SUPPORT
+#endif
+
+namespace Json {
+class Value;
+}
+
+#ifdef XR_KHR_LOADER_INIT_SUPPORT
+//! Initialize loader, where required.
+XrResult InitializeLoader(const XrLoaderInitInfoBaseHeaderKHR* loaderInitInfo);
+XrResult GetPlatformRuntimeVirtualManifest(Json::Value& out_manifest);
+#endif
+
+class RuntimeManifestFile;
+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 *(GetInstance().get()); }
+    static XrResult GetInstanceProcAddr(XrInstance instance, const char* name, PFN_xrVoidFunction* function);
+
+    // Get the direct dispatch table to this runtime, without API layers or loader terminators.
+    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_instance_proc_addr);
+    void SetSupportedExtensions(std::vector<std::string>& supported_extensions);
+    static XrResult TryLoadingSingleRuntime(const std::string& openxr_command, std::unique_ptr<RuntimeManifestFile>& manifest_file);
+
+    static std::unique_ptr<RuntimeInterface>& GetInstance() {
+        static std::unique_ptr<RuntimeInterface> instance;
+        return instance;
+    }
+
+    LoaderPlatformLibraryHandle _runtime_library;
+    PFN_xrGetInstanceProcAddr _get_instance_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;
+};