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Packages/com.unity.xr.openxr/Samples~/InterceptFeature/InterceptFeaturePlugin/Native~/ext_intercept_create_session.cpp

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+#include "IUnityInterface.h"
+#include "XR/IUnityXRTrace.h"
+#include "openxr/openxr.h"
+#include <cstring>
+#include <string>
+
+typedef void (*SendMessageToScript_pfn)(const char* message);
+
+static IUnityXRTrace* s_Trace = nullptr;
+static PFN_xrGetInstanceProcAddr s_xrGetInstanceProcAddr = nullptr;
+static PFN_xrCreateSession s_xrCreateSession = nullptr;
+static std::string s_message = "not set from c#";
+static SendMessageToScript_pfn s_callback = nullptr;
+
+static XrResult XRAPI_PTR intercepted_xrCreateSession(XrInstance instance, const XrSessionCreateInfo* createInfo, XrSession* session)
+{
+    XR_TRACE_LOG(s_Trace, "Intercepted xrCreateSession, message: %s\n", s_message.c_str());
+    if (s_callback != nullptr)
+        s_callback(s_message.c_str());
+
+    return s_xrCreateSession(instance, createInfo, session);
+}
+
+static XrResult XRAPI_PTR intercept_xrCreateSession_xrGetInstanceProcAddr(XrInstance instance, const char* name, PFN_xrVoidFunction* function)
+{
+    XrResult result = s_xrGetInstanceProcAddr(instance, name, function);
+    if (strcmp("xrCreateSession", name) == 0)
+    {
+        s_xrCreateSession = (PFN_xrCreateSession)*function;
+        *function = (PFN_xrVoidFunction)intercepted_xrCreateSession;
+    }
+    return result;
+}
+
+extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API script_set_callback(SendMessageToScript_pfn callback)
+{
+    s_callback = callback;
+}
+
+extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API script_set_message(char* message)
+{
+    s_message = message;
+}
+
+extern "C" PFN_xrGetInstanceProcAddr UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API
+script_intercept_xrCreateSession_xrGetInstanceProcAddr(PFN_xrGetInstanceProcAddr old)
+{
+    s_xrGetInstanceProcAddr = old;
+    return intercept_xrCreateSession_xrGetInstanceProcAddr;
+}
+
+extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API
+UnityPluginLoad(IUnityInterfaces* unityInterfaces)
+{
+    s_Trace = unityInterfaces->Get<IUnityXRTrace>();
+}
+
+extern "C" void UNITY_INTERFACE_EXPORT UNITY_INTERFACE_API
+UnityPluginUnload()
+{
+}