/*************************************************************************/
/*  camera_feed.h                                                        */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* 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 CAMERA_FEED_H
#define CAMERA_FEED_H

#include "core/image.h"
#include "core/math/transform_2d.h"
#include "servers/camera_server.h"
#include "servers/visual_server.h"

/**
	@author Bastiaan Olij <mux213@gmail.com>

	The camera server is a singleton object that gives access to the various
	camera feeds that can be used as the background for our environment.
**/

class CameraFeed : public Reference {
	GDCLASS(CameraFeed, Reference);

public:
	enum FeedDataType {
		FEED_NOIMAGE, // we don't have an image yet
		FEED_RGB, // our texture will contain a normal RGB texture that can be used directly
		FEED_YCBCR, // our texture will contain a YCbCr texture that needs to be converted to RGB before output
		FEED_YCBCR_SEP // our camera is split into two textures, first plane contains Y data, second plane contains CbCr data
	};

	enum FeedPosition {
		FEED_UNSPECIFIED, // we have no idea
		FEED_FRONT, // this is a camera on the front of the device
		FEED_BACK // this is a camera on the back of the device
	};

private:
	int id; // unique id for this, for internal use in case feeds are removed
	int base_width;
	int base_height;

protected:
	String name; // name of our camera feed
	FeedDataType datatype; // type of texture data stored
	FeedPosition position; // position of camera on the device
	Transform2D transform; // display transform

	bool active; // only when active do we actually update the camera texture each frame
	RID texture[CameraServer::FEED_IMAGES]; // texture images needed for this

	static void _bind_methods();

public:
	int get_id() const;
	bool is_active() const;
	void set_active(bool p_is_active);

	String get_name() const;
	void set_name(String p_name);

	int get_base_width() const;
	int get_base_height() const;

	FeedPosition get_position() const;
	void set_position(FeedPosition p_position);

	Transform2D get_transform() const;
	void set_transform(const Transform2D &p_transform);

	RID get_texture(CameraServer::FeedImage p_which);

	CameraFeed();
	CameraFeed(String p_name, FeedPosition p_position = CameraFeed::FEED_UNSPECIFIED);
	virtual ~CameraFeed();

	FeedDataType get_datatype() const;
	void set_RGB_img(Ref<Image> p_rgb_img);
	void set_YCbCr_img(Ref<Image> p_ycbcr_img);
	void set_YCbCr_imgs(Ref<Image> p_y_img, Ref<Image> p_cbcr_img);
	void allocate_texture(int p_width, int p_height, Image::Format p_format, VisualServer::TextureType p_texture_type, FeedDataType p_data_type);

	virtual bool activate_feed();
	virtual void deactivate_feed();
};

VARIANT_ENUM_CAST(CameraFeed::FeedDataType);
VARIANT_ENUM_CAST(CameraFeed::FeedPosition);

#endif /* !CAMERA_FEED_H */