virtualx-engine/modules/openxr/scene/openxr_composition_layer.h

/**************************************************************************/
/*  openxr_composition_layer.h                                            */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
/* the following conditions:                                              */
/*                                                                        */
/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
/*                                                                        */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
/**************************************************************************/

#ifndef OPENXR_COMPOSITION_LAYER_H
#define OPENXR_COMPOSITION_LAYER_H

#include <openxr/openxr.h>

#include "scene/3d/node_3d.h"

class MeshInstance3D;
class Mesh;
class OpenXRAPI;
class OpenXRCompositionLayerExtension;
class OpenXRViewportCompositionLayerProvider;
class SubViewport;

class OpenXRCompositionLayer : public Node3D {
	GDCLASS(OpenXRCompositionLayer, Node3D);

	SubViewport *layer_viewport = nullptr;
	MeshInstance3D *fallback = nullptr;
	bool should_update_fallback_mesh = false;

	Dictionary extension_property_values;

	void _create_fallback_node();
	void _reset_fallback_material();

protected:
	OpenXRAPI *openxr_api = nullptr;
	OpenXRCompositionLayerExtension *composition_layer_extension = nullptr;
	OpenXRViewportCompositionLayerProvider *openxr_layer_provider = nullptr;

	static void _bind_methods();

	void _notification(int p_what);
	void _get_property_list(List<PropertyInfo> *p_property_list) const;
	bool _get(const StringName &p_property, Variant &r_value) const;
	bool _set(const StringName &p_property, const Variant &p_value);

	virtual void _on_openxr_session_begun();
	virtual void _on_openxr_session_stopping();

	virtual Ref<Mesh> _create_fallback_mesh() = 0;

	void update_fallback_mesh();

	static HashSet<SubViewport *> viewports_in_use;

public:
	void set_layer_viewport(SubViewport *p_viewport);
	SubViewport *get_layer_viewport() const;

	void set_sort_order(int p_order);
	int get_sort_order() const;

	void set_alpha_blend(bool p_alpha_blend);
	bool get_alpha_blend() const;

	bool is_natively_supported() const;

	virtual PackedStringArray get_configuration_warnings() const override;

	virtual Vector2 intersects_ray(const Vector3 &p_origin, const Vector3 &p_direction) const;

	OpenXRCompositionLayer();
	~OpenXRCompositionLayer();
};

#endif // OPENXR_COMPOSITION_LAYER_H