godot/modules/openxr/scene/openxr_composition_layer.h

/**************************************************************************/
/*  openxr_composition_layer.h                                            */
/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#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