/**************************************************************************/
/*  openxr_api_extension.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.                  */
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/* 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     */
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#ifndef OPENXR_API_EXTENSION_H
#define OPENXR_API_EXTENSION_H

#include "openxr_api.h"

#include "core/object/ref_counted.h"
#include "core/os/os.h"
#include "core/os/thread_safe.h"
#include "core/variant/native_ptr.h"

class OpenXRExtensionWrapperExtension;

class OpenXRAPIExtension : public RefCounted {
	GDCLASS(OpenXRAPIExtension, RefCounted);

protected:
	_THREAD_SAFE_CLASS_

	static void _bind_methods();

public:
	uint64_t get_instance();
	uint64_t get_system_id();
	uint64_t get_session();

	// Helper method to convert an XrPosef to a Transform3D.
	Transform3D transform_from_pose(GDExtensionConstPtr<const void> p_pose);

	bool xr_result(uint64_t result, String format, Array args = Array());

	static bool openxr_is_enabled(bool p_check_run_in_editor = true);

	//TODO workaround as GDExtensionPtr<void> return type results in build error in godot-cpp
	uint64_t get_instance_proc_addr(String p_name);
	String get_error_string(uint64_t result);
	String get_swapchain_format_name(int64_t p_swapchain_format);

	bool is_initialized();
	bool is_running();

	uint64_t get_play_space();
	int64_t get_predicted_display_time();
	int64_t get_next_frame_time();
	bool can_render();

	uint64_t get_hand_tracker(int p_hand_index);

	void register_composition_layer_provider(OpenXRExtensionWrapperExtension *p_extension);
	void unregister_composition_layer_provider(OpenXRExtensionWrapperExtension *p_extension);

	enum OpenXRAlphaBlendModeSupport {
		OPENXR_ALPHA_BLEND_MODE_SUPPORT_NONE = 0,
		OPENXR_ALPHA_BLEND_MODE_SUPPORT_REAL = 1,
		OPENXR_ALPHA_BLEND_MODE_SUPPORT_EMULATING = 2,
	};

	void set_emulate_environment_blend_mode_alpha_blend(bool p_enabled);
	OpenXRAlphaBlendModeSupport is_environment_blend_mode_alpha_blend_supported();

	OpenXRAPIExtension();
};

VARIANT_ENUM_CAST(OpenXRAPIExtension::OpenXRAlphaBlendModeSupport);

#endif // OPENXR_API_EXTENSION_H