OpenXR: Allow extending Android surface swapchain creation from GDExtension

modules/openxr/doc_classes/OpenXRExtensionWrapperExtension.xml

@@ -178,6 +178,15 @@
 				[param layer] is a pointer to an [code]XrCompositionLayerBaseHeader[/code] struct.
 			</description>
 		</method>
+		<method name="_set_android_surface_swapchain_create_info_and_get_next_pointer" qualifiers="virtual">
+			<return type="int" />
+			<param index="0" name="property_values" type="Dictionary" />
+			<param index="1" name="next_pointer" type="void*" />
+			<description>
+				Adds additional data structures to Android surface swapchains created by [OpenXRCompositionLayer].
+				[param property_values] contains the values of the properties returned by [method _get_viewport_composition_layer_extension_properties].
+			</description>
+		</method>
 		<method name="_set_hand_joint_locations_and_get_next_pointer" qualifiers="virtual">
 			<return type="int" />
 			<param index="0" name="hand_index" type="int" />

modules/openxr/extensions/openxr_composition_layer_extension.cpp

@@ -144,7 +144,6 @@ bool OpenXRCompositionLayerExtension::create_android_surface_swapchain(XrSwapcha
 		OpenXRAPI *openxr_api = OpenXRAPI::get_singleton();
 		ERR_FAIL_NULL_V(openxr_api, false);
 
-		// @todo We need a way to add to the next pointer chain.
 		XrResult result = xrCreateSwapchainAndroidSurfaceKHR(openxr_api->get_session(), p_info, r_swapchain, r_surface);
 		if (XR_FAILED(result)) {
 			print_line("OpenXR: Failed to create Android surface swapchain [", openxr_api->get_error_string(result), "]");
@@ -254,11 +253,19 @@ void OpenXRViewportCompositionLayerProvider::create_android_surface() {
 	ERR_FAIL_COND(android_surface.swapchain != XR_NULL_HANDLE || android_surface.surface.is_valid());
 	ERR_FAIL_COND(!openxr_api || !openxr_api->is_running());
 
+	void *next_pointer = nullptr;
+	for (OpenXRExtensionWrapper *wrapper : openxr_api->get_registered_extension_wrappers()) {
+		void *np = wrapper->set_android_surface_swapchain_create_info_and_get_next_pointer(extension_property_values, next_pointer);
+		if (np != nullptr) {
+			next_pointer = np;
+		}
+	}
+
 	// The XR_FB_android_surface_swapchain_create extension mandates that format, sampleCount,
 	// faceCount, arraySize, and mipCount must be zero.
 	XrSwapchainCreateInfo info = {
 		XR_TYPE_SWAPCHAIN_CREATE_INFO, // type
-		nullptr, // next
+		next_pointer, // next
 		0, // createFlags
 		XR_SWAPCHAIN_USAGE_SAMPLED_BIT | XR_SWAPCHAIN_USAGE_COLOR_ATTACHMENT_BIT | XR_SWAPCHAIN_USAGE_MUTABLE_FORMAT_BIT, // usageFlags
 		0, // format

modules/openxr/extensions/openxr_extension_wrapper.h

@@ -97,10 +97,11 @@ public:
 	virtual void on_state_loss_pending() {} // `on_state_loss_pending` is called when the OpenXR session state is changed to loss pending.
 	virtual void on_state_exiting() {} // `on_state_exiting` is called when the OpenXR session state is changed to exiting.
 
-	virtual void *set_viewport_composition_layer_and_get_next_pointer(const XrCompositionLayerBaseHeader *p_layer, Dictionary p_property_values, void *p_next_pointer) { return p_next_pointer; } // Add additional data structures to composition layers created via OpenXRCompositionLayer.
+	virtual void *set_viewport_composition_layer_and_get_next_pointer(const XrCompositionLayerBaseHeader *p_layer, const Dictionary &p_property_values, void *p_next_pointer) { return p_next_pointer; } // Add additional data structures to composition layers created via OpenXRCompositionLayer.
 	virtual void on_viewport_composition_layer_destroyed(const XrCompositionLayerBaseHeader *p_layer) {} // `on_viewport_composition_layer_destroyed` is called when a composition layer created via OpenXRCompositionLayer is destroyed.
 	virtual void get_viewport_composition_layer_extension_properties(List<PropertyInfo> *p_property_list) {} // Get additional property definitions for OpenXRCompositionLayer.
 	virtual Dictionary get_viewport_composition_layer_extension_property_defaults() { return Dictionary(); } // Get the default values for the additional property definitions for OpenXRCompositionLayer.
+	virtual void *set_android_surface_swapchain_create_info_and_get_next_pointer(const Dictionary &p_property_values, void *p_next_pointer) { return p_next_pointer; }
 
 	// `on_event_polled` is called when there is an OpenXR event to process.
 	// Should return true if the event was handled, false otherwise.

modules/openxr/extensions/openxr_extension_wrapper_extension.cpp

@@ -65,6 +65,7 @@ void OpenXRExtensionWrapperExtension::_bind_methods() {
 	GDVIRTUAL_BIND(_get_viewport_composition_layer_extension_properties);
 	GDVIRTUAL_BIND(_get_viewport_composition_layer_extension_property_defaults);
 	GDVIRTUAL_BIND(_on_viewport_composition_layer_destroyed, "layer");
+	GDVIRTUAL_BIND(_set_android_surface_swapchain_create_info_and_get_next_pointer, "property_values", "next_pointer");
 
 	ClassDB::bind_method(D_METHOD("get_openxr_api"), &OpenXRExtensionWrapperExtension::get_openxr_api);
 	ClassDB::bind_method(D_METHOD("register_extension_wrapper"), &OpenXRExtensionWrapperExtension::register_extension_wrapper);
@@ -249,7 +250,7 @@ bool OpenXRExtensionWrapperExtension::on_event_polled(const XrEventDataBuffer &p
 	return false;
 }
 
-void *OpenXRExtensionWrapperExtension::set_viewport_composition_layer_and_get_next_pointer(const XrCompositionLayerBaseHeader *p_layer, Dictionary p_property_values, void *p_next_pointer) {
+void *OpenXRExtensionWrapperExtension::set_viewport_composition_layer_and_get_next_pointer(const XrCompositionLayerBaseHeader *p_layer, const Dictionary &p_property_values, void *p_next_pointer) {
 	uint64_t pointer = 0;
 
 	if (GDVIRTUAL_CALL(_set_viewport_composition_layer_and_get_next_pointer, GDExtensionConstPtr<void>(p_layer), p_property_values, GDExtensionPtr<void>(p_next_pointer), pointer)) {
@@ -279,6 +280,16 @@ Dictionary OpenXRExtensionWrapperExtension::get_viewport_composition_layer_exten
 	return property_defaults;
 }
 
+void *OpenXRExtensionWrapperExtension::set_android_surface_swapchain_create_info_and_get_next_pointer(const Dictionary &p_property_values, void *p_next_pointer) {
+	uint64_t pointer = 0;
+
+	if (GDVIRTUAL_CALL(_set_android_surface_swapchain_create_info_and_get_next_pointer, p_property_values, GDExtensionPtr<void>(p_next_pointer), pointer)) {
+		return reinterpret_cast<void *>(pointer);
+	}
+
+	return p_next_pointer;
+}
+
 Ref<OpenXRAPIExtension> OpenXRExtensionWrapperExtension::get_openxr_api() {
 	return openxr_api;
 }

modules/openxr/extensions/openxr_extension_wrapper_extension.h

@@ -121,15 +121,17 @@ public:
 
 	GDVIRTUAL1R(bool, _on_event_polled, GDExtensionConstPtr<void>);
 
-	virtual void *set_viewport_composition_layer_and_get_next_pointer(const XrCompositionLayerBaseHeader *p_layer, Dictionary p_property_values, void *p_next_pointer) override;
+	virtual void *set_viewport_composition_layer_and_get_next_pointer(const XrCompositionLayerBaseHeader *p_layer, const Dictionary &p_property_values, void *p_next_pointer) override;
 	virtual void on_viewport_composition_layer_destroyed(const XrCompositionLayerBaseHeader *p_layer) override;
 	virtual void get_viewport_composition_layer_extension_properties(List<PropertyInfo> *p_property_list) override;
 	virtual Dictionary get_viewport_composition_layer_extension_property_defaults() override;
+	virtual void *set_android_surface_swapchain_create_info_and_get_next_pointer(const Dictionary &p_property_values, void *p_next_pointer) override;
 
 	GDVIRTUAL3R(uint64_t, _set_viewport_composition_layer_and_get_next_pointer, GDExtensionConstPtr<void>, Dictionary, GDExtensionPtr<void>);
 	GDVIRTUAL1(_on_viewport_composition_layer_destroyed, GDExtensionConstPtr<void>);
 	GDVIRTUAL0R(TypedArray<Dictionary>, _get_viewport_composition_layer_extension_properties);
 	GDVIRTUAL0R(Dictionary, _get_viewport_composition_layer_extension_property_defaults);
+	GDVIRTUAL2R(uint64_t, _set_android_surface_swapchain_create_info_and_get_next_pointer, Dictionary, GDExtensionPtr<void>);
 
 	Ref<OpenXRAPIExtension> get_openxr_api();