OpenXR: Fix initialization warning on Android

This commit adds proper checking for XR_KHR_loader_init support and
fixes the warning regarding missing extensions on Android to only appear
if neither XR_KHR_loader_init nor XR_KHR_loader_init_android are
supported by the runtime.

modules/openxr/extensions/openxr_android_extension.cpp

@@ -51,18 +51,17 @@ OpenXRAndroidExtension::OpenXRAndroidExtension() {
 HashMap<String, bool *> OpenXRAndroidExtension::get_requested_extensions() {
 	HashMap<String, bool *> request_extensions;
 
-	request_extensions[XR_KHR_LOADER_INIT_ANDROID_EXTENSION_NAME] = &loader_init_extension_available;
 	request_extensions[XR_KHR_ANDROID_CREATE_INSTANCE_EXTENSION_NAME] = &create_instance_extension_available;
 
 	return request_extensions;
 }
 
 void OpenXRAndroidExtension::on_before_instance_created() {
-	if (!loader_init_extension_available) {
-		print_line("OpenXR: XR_KHR_loader_init_android is not reported as available - trying to initialize anyway...");
+	if (XR_FAILED(EXT_TRY_INIT_XR_FUNC(xrInitializeLoaderKHR))) {
+		// XR_KHR_loader_init not supported on this platform
+		return;
 	}
-
-	EXT_INIT_XR_FUNC(xrInitializeLoaderKHR);
+	loader_init_extension_available = true;
 
 	JNIEnv *env = get_jni_env();
 	JavaVM *vm;
@@ -85,6 +84,9 @@ static XrInstanceCreateInfoAndroidKHR instance_create_info;
 
 void *OpenXRAndroidExtension::set_instance_create_info_and_get_next_pointer(void *p_next_pointer) {
 	if (!create_instance_extension_available) {
+		if (!loader_init_extension_available) {
+			WARN_PRINT("No Android extensions available, couldn't pass JVM and Activity to OpenXR");
+		}
 		return nullptr;
 	}
 

modules/openxr/openxr_api.cpp

@@ -1224,8 +1224,12 @@ bool OpenXRAPI::resolve_instance_openxr_symbols() {
 	return true;
 }
 
+XrResult OpenXRAPI::try_get_instance_proc_addr(const char *p_name, PFN_xrVoidFunction *p_addr) {
+	return xrGetInstanceProcAddr(instance, p_name, p_addr);
+}
+
 XrResult OpenXRAPI::get_instance_proc_addr(const char *p_name, PFN_xrVoidFunction *p_addr) {
-	XrResult result = xrGetInstanceProcAddr(instance, p_name, p_addr);
+	XrResult result = try_get_instance_proc_addr(p_name, p_addr);
 
 	if (result != XR_SUCCESS) {
 		String error_message = String("Symbol ") + p_name + " not found in OpenXR instance.";

modules/openxr/openxr_api.h

@@ -305,6 +305,7 @@ public:
 	static bool openxr_is_enabled(bool p_check_run_in_editor = true);
 	_FORCE_INLINE_ static OpenXRAPI *get_singleton() { return singleton; }
 
+	XrResult try_get_instance_proc_addr(const char *p_name, PFN_xrVoidFunction *p_addr);
 	XrResult get_instance_proc_addr(const char *p_name, PFN_xrVoidFunction *p_addr);
 	String get_error_string(XrResult result);
 	String get_swapchain_format_name(int64_t p_swapchain_format) const;

modules/openxr/util.h

@@ -53,6 +53,12 @@
 #define EXT_INIT_XR_FUNC(name) INIT_XR_FUNC(OpenXRAPI::get_singleton(), name)
 #define OPENXR_API_INIT_XR_FUNC(name) INIT_XR_FUNC(this, name)
 
+#define TRY_INIT_XR_FUNC(openxr_api, name) \
+	openxr_api->try_get_instance_proc_addr(#name, (PFN_xrVoidFunction *)&name##_ptr)
+
+#define EXT_TRY_INIT_XR_FUNC(name) TRY_INIT_XR_FUNC(OpenXRAPI::get_singleton(), name)
+#define OPENXR_TRY_API_INIT_XR_FUNC(name) TRY_INIT_XR_FUNC(this, name)
+
 #define EXT_PROTO_XRRESULT_FUNC1(func_name, arg1_type, arg1)                    \
 	PFN_##func_name func_name##_ptr = nullptr;                                  \
 	XRAPI_ATTR XrResult XRAPI_CALL func_name(UNPACK arg1_type p_##arg1) const { \