texture.h

/*************************************************************************/
/*  texture.h                                                            */
/*************************************************************************/
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#ifndef TEXTURE_H
#define TEXTURE_H

#include "core/io/resource_loader.h"
#include "core/math/rect2.h"
#include "core/os/mutex.h"
#include "core/os/rw_lock.h"
#include "core/os/thread_safe.h"
#include "core/resource.h"
#include "scene/resources/curve.h"
#include "scene/resources/gradient.h"
#include "servers/camera_server.h"
#include "servers/visual_server.h"

class Texture : public Resource {

	GDCLASS(Texture, Resource);
	OBJ_SAVE_TYPE(Texture); // Saves derived classes with common type so they can be interchanged.

protected:
	static void _bind_methods();

public:
	enum Flags {
		FLAG_MIPMAPS = VisualServer::TEXTURE_FLAG_MIPMAPS,
		FLAG_REPEAT = VisualServer::TEXTURE_FLAG_REPEAT,
		FLAG_FILTER = VisualServer::TEXTURE_FLAG_FILTER,
		FLAG_ANISOTROPIC_FILTER = VisualServer::TEXTURE_FLAG_ANISOTROPIC_FILTER,
		FLAG_CONVERT_TO_LINEAR = VisualServer::TEXTURE_FLAG_CONVERT_TO_LINEAR,
		FLAG_VIDEO_SURFACE = VisualServer::TEXTURE_FLAG_USED_FOR_STREAMING,
		FLAGS_DEFAULT = FLAG_MIPMAPS | FLAG_REPEAT | FLAG_FILTER,
		FLAG_MIRRORED_REPEAT = VisualServer::TEXTURE_FLAG_MIRRORED_REPEAT
	};

	virtual int get_width() const = 0;
	virtual int get_height() const = 0;
	virtual Size2 get_size() const;
	virtual RID get_rid() const = 0;

	virtual bool is_pixel_opaque(int p_x, int p_y) const;

	virtual bool has_alpha() const = 0;

	virtual void set_flags(uint32_t p_flags) = 0;
	virtual uint32_t get_flags() const = 0;

	virtual void draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile = false, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>(), bool p_clip_uv = true) const;
	virtual bool get_rect_region(const Rect2 &p_rect, const Rect2 &p_src_rect, Rect2 &r_rect, Rect2 &r_src_rect) const;

	virtual Ref<Image> get_data() const { return Ref<Image>(); }

	Texture();
};

VARIANT_ENUM_CAST(Texture::Flags);

class BitMap;

class ImageTexture : public Texture {

	GDCLASS(ImageTexture, Texture);
	RES_BASE_EXTENSION("tex");

public:
	enum Storage {
		STORAGE_RAW,
		STORAGE_COMPRESS_LOSSY,
		STORAGE_COMPRESS_LOSSLESS
	};

private:
	RID texture;
	Image::Format format;
	uint32_t flags;
	int w, h;
	Storage storage;
	Size2 size_override;
	float lossy_storage_quality;
	mutable Ref<BitMap> alpha_cache;
	bool image_stored;

protected:
	virtual void reload_from_file();

	bool _set(const StringName &p_name, const Variant &p_value);
	bool _get(const StringName &p_name, Variant &r_ret) const;
	void _get_property_list(List<PropertyInfo> *p_list) const;

	void _reload_hook(const RID &p_hook);
	virtual void _resource_path_changed();
	static void _bind_methods();

	void _set_data(Dictionary p_data);

public:
	void create(int p_width, int p_height, Image::Format p_format, uint32_t p_flags = FLAGS_DEFAULT);
	void create_from_image(const Ref<Image> &p_image, uint32_t p_flags = FLAGS_DEFAULT);

	void set_flags(uint32_t p_flags);
	uint32_t get_flags() const;
	Image::Format get_format() const;
#ifndef DISABLE_DEPRECATED
	Error load(const String &p_path);
#endif
	void set_data(const Ref<Image> &p_image);
	Ref<Image> get_data() const;

	int get_width() const;
	int get_height() const;

	virtual RID get_rid() const;

	bool has_alpha() const;
	virtual void draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile = false, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>(), bool p_clip_uv = true) const;
	void set_storage(Storage p_storage);
	Storage get_storage() const;

	bool is_pixel_opaque(int p_x, int p_y) const;

	void set_lossy_storage_quality(float p_lossy_storage_quality);
	float get_lossy_storage_quality() const;

	void set_size_override(const Size2 &p_size);

	virtual void set_path(const String &p_path, bool p_take_over = false);

	ImageTexture();
	~ImageTexture();
};

class StreamTexture : public Texture {

	GDCLASS(StreamTexture, Texture);

public:
	enum DataFormat {
		DATA_FORMAT_IMAGE,
		DATA_FORMAT_LOSSLESS,
		DATA_FORMAT_LOSSY
	};

	enum FormatBits {
		FORMAT_MASK_IMAGE_FORMAT = (1 << 20) - 1,
		FORMAT_BIT_LOSSLESS = 1 << 20,
		FORMAT_BIT_LOSSY = 1 << 21,
		FORMAT_BIT_STREAM = 1 << 22,
		FORMAT_BIT_HAS_MIPMAPS = 1 << 23,
		FORMAT_BIT_DETECT_3D = 1 << 24,
		FORMAT_BIT_DETECT_SRGB = 1 << 25,
		FORMAT_BIT_DETECT_NORMAL = 1 << 26,
	};

private:
	Error _load_data(const String &p_path, int &tw, int &th, int &tw_custom, int &th_custom, int &flags, Ref<Image> &image, int p_size_limit = 0);
	String path_to_file;
	RID texture;
	Image::Format format;
	uint32_t flags;
	int w, h;
	mutable Ref<BitMap> alpha_cache;

	virtual void reload_from_file();

	static void _requested_3d(void *p_ud);
	static void _requested_srgb(void *p_ud);
	static void _requested_normal(void *p_ud);

protected:
	static void _bind_methods();
	void _validate_property(PropertyInfo &property) const;

public:
	typedef void (*TextureFormatRequestCallback)(const Ref<StreamTexture> &);

	static TextureFormatRequestCallback request_3d_callback;
	static TextureFormatRequestCallback request_srgb_callback;
	static TextureFormatRequestCallback request_normal_callback;

	uint32_t get_flags() const;
	Image::Format get_format() const;
	Error load(const String &p_path);
	String get_load_path() const;

	int get_width() const;
	int get_height() const;
	virtual RID get_rid() const;

	virtual void set_path(const String &p_path, bool p_take_over);

	virtual void draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile = false, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>(), bool p_clip_uv = true) const;

	virtual bool has_alpha() const;
	virtual void set_flags(uint32_t p_flags);
	bool is_pixel_opaque(int p_x, int p_y) const;

	virtual Ref<Image> get_data() const;

	StreamTexture();
	~StreamTexture();
};

class ResourceFormatLoaderStreamTexture : public ResourceFormatLoader {
public:
	virtual RES load(const String &p_path, const String &p_original_path = "", Error *r_error = NULL);
	virtual void get_recognized_extensions(List<String> *p_extensions) const;
	virtual bool handles_type(const String &p_type) const;
	virtual String get_resource_type(const String &p_path) const;
};

VARIANT_ENUM_CAST(ImageTexture::Storage);

class AtlasTexture : public Texture {

	GDCLASS(AtlasTexture, Texture);
	RES_BASE_EXTENSION("atlastex");

protected:
	Ref<Texture> atlas;
	Rect2 region;
	Rect2 margin;
	bool filter_clip;

	static void _bind_methods();

public:
	virtual int get_width() const;
	virtual int get_height() const;
	virtual RID get_rid() const;

	virtual bool has_alpha() const;

	virtual void set_flags(uint32_t p_flags);
	virtual uint32_t get_flags() const;

	void set_atlas(const Ref<Texture> &p_atlas);
	Ref<Texture> get_atlas() const;

	void set_region(const Rect2 &p_region);
	Rect2 get_region() const;

	void set_margin(const Rect2 &p_margin);
	Rect2 get_margin() const;

	void set_filter_clip(const bool p_enable);
	bool has_filter_clip() const;

	virtual void draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile = false, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>(), bool p_clip_uv = true) const;
	virtual bool get_rect_region(const Rect2 &p_rect, const Rect2 &p_src_rect, Rect2 &r_rect, Rect2 &r_src_rect) const;

	bool is_pixel_opaque(int p_x, int p_y) const;

	AtlasTexture();
};

class Mesh;

class MeshTexture : public Texture {

	GDCLASS(MeshTexture, Texture);
	RES_BASE_EXTENSION("meshtex");

	Ref<Texture> base_texture;
	Ref<Mesh> mesh;
	Size2i size;

protected:
	static void _bind_methods();

public:
	virtual int get_width() const;
	virtual int get_height() const;
	virtual RID get_rid() const;

	virtual bool has_alpha() const;

	virtual void set_flags(uint32_t p_flags);
	virtual uint32_t get_flags() const;

	void set_mesh(const Ref<Mesh> &p_mesh);
	Ref<Mesh> get_mesh() const;

	void set_image_size(const Size2 &p_size);
	Size2 get_image_size() const;

	void set_base_texture(const Ref<Texture> &p_texture);
	Ref<Texture> get_base_texture() const;

	virtual void draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile = false, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>(), bool p_clip_uv = true) const;
	virtual bool get_rect_region(const Rect2 &p_rect, const Rect2 &p_src_rect, Rect2 &r_rect, Rect2 &r_src_rect) const;

	bool is_pixel_opaque(int p_x, int p_y) const;

	MeshTexture();
};

class LargeTexture : public Texture {

	GDCLASS(LargeTexture, Texture);
	RES_BASE_EXTENSION("largetex");

protected:
	struct Piece {

		Point2 offset;
		Ref<Texture> texture;
	};

	Vector<Piece> pieces;
	Size2i size;

	Array _get_data() const;
	void _set_data(const Array &p_array);
	static void _bind_methods();

public:
	virtual int get_width() const;
	virtual int get_height() const;
	virtual RID get_rid() const;

	virtual bool has_alpha() const;

	virtual void set_flags(uint32_t p_flags);
	virtual uint32_t get_flags() const;

	int add_piece(const Point2 &p_offset, const Ref<Texture> &p_texture);
	void set_piece_offset(int p_idx, const Point2 &p_offset);
	void set_piece_texture(int p_idx, const Ref<Texture> &p_texture);

	void set_size(const Size2 &p_size);
	void clear();

	int get_piece_count() const;
	Vector2 get_piece_offset(int p_idx) const;
	Ref<Texture> get_piece_texture(int p_idx) const;
	Ref<Image> to_image() const;

	virtual void draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile = false, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>()) const;
	virtual void draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>(), bool p_clip_uv = true) const;

	bool is_pixel_opaque(int p_x, int p_y) const;

	LargeTexture();
};

class CubeMap : public Resource {

	GDCLASS(CubeMap, Resource);
	RES_BASE_EXTENSION("cubemap");

public:
	enum Storage {
		STORAGE_RAW,
		STORAGE_COMPRESS_LOSSY,
		STORAGE_COMPRESS_LOSSLESS
	};

	enum Side {

		SIDE_LEFT,
		SIDE_RIGHT,
		SIDE_BOTTOM,
		SIDE_TOP,
		SIDE_FRONT,
		SIDE_BACK
	};

	enum Flags {
		FLAG_MIPMAPS = VisualServer::TEXTURE_FLAG_MIPMAPS,
		FLAG_REPEAT = VisualServer::TEXTURE_FLAG_REPEAT,
		FLAG_FILTER = VisualServer::TEXTURE_FLAG_FILTER,
		FLAGS_DEFAULT = FLAG_MIPMAPS | FLAG_REPEAT | FLAG_FILTER,
	};

private:
	bool valid[6];
	RID cubemap;
	Image::Format format;
	uint32_t flags;
	int w, h;
	Storage storage;
	Size2 size_override;
	float lossy_storage_quality;

	_FORCE_INLINE_ bool _is_valid() const {
		for (int i = 0; i < 6; i++) {
			if (valid[i]) return true;
		}
		return false;
	}

protected:
	bool _set(const StringName &p_name, const Variant &p_value);
	bool _get(const StringName &p_name, Variant &r_ret) const;
	void _get_property_list(List<PropertyInfo> *p_list) const;

	static void _bind_methods();

public:
	void set_flags(uint32_t p_flags);
	uint32_t get_flags() const;
	void set_side(Side p_side, const Ref<Image> &p_image);
	Ref<Image> get_side(Side p_side) const;

	Image::Format get_format() const;
	int get_width() const;
	int get_height() const;

	virtual RID get_rid() const;

	void set_storage(Storage p_storage);
	Storage get_storage() const;

	void set_lossy_storage_quality(float p_lossy_storage_quality);
	float get_lossy_storage_quality() const;

	virtual void set_path(const String &p_path, bool p_take_over = false);

	CubeMap();
	~CubeMap();
};

VARIANT_ENUM_CAST(CubeMap::Flags)
VARIANT_ENUM_CAST(CubeMap::Side)
VARIANT_ENUM_CAST(CubeMap::Storage)

class TextureLayered : public Resource {

	GDCLASS(TextureLayered, Resource);

public:
	enum Flags {
		FLAG_MIPMAPS = VisualServer::TEXTURE_FLAG_MIPMAPS,
		FLAG_REPEAT = VisualServer::TEXTURE_FLAG_REPEAT,
		FLAG_FILTER = VisualServer::TEXTURE_FLAG_FILTER,
		FLAG_CONVERT_TO_LINEAR = VisualServer::TEXTURE_FLAG_CONVERT_TO_LINEAR,
		FLAGS_DEFAULT = FLAG_FILTER,
	};

	enum CompressMode {
		COMPRESS_LOSSLESS,
		COMPRESS_VIDEO_RAM,
		COMPRESS_UNCOMPRESSED
	};

private:
	String path_to_file;
	bool is_3d;
	RID texture;
	Image::Format format;
	uint32_t flags;

	int width;
	int height;
	int depth;

	virtual void reload_from_file();

	void _set_data(const Dictionary &p_data);
	Dictionary _get_data() const;

protected:
	static void _bind_methods();

public:
	void set_flags(uint32_t p_flags);
	uint32_t get_flags() const;

	Image::Format get_format() const;
	Error load(const String &p_path);
	String get_load_path() const;

	uint32_t get_width() const;
	uint32_t get_height() const;
	uint32_t get_depth() const;

	void create(uint32_t p_width, uint32_t p_height, uint32_t p_depth, Image::Format p_format, uint32_t p_flags = FLAGS_DEFAULT);
	void set_layer_data(const Ref<Image> &p_image, int p_layer);
	Ref<Image> get_layer_data(int p_layer) const;
	void set_data_partial(const Ref<Image> &p_image, int p_x_ofs, int p_y_ofs, int p_z, int p_mipmap = 0);

	virtual RID get_rid() const;
	virtual void set_path(const String &p_path, bool p_take_over = false);

	TextureLayered(bool p_3d = false);
	~TextureLayered();
};

VARIANT_ENUM_CAST(TextureLayered::Flags)

class Texture3D : public TextureLayered {

	GDCLASS(Texture3D, TextureLayered);

public:
	Texture3D() :
			TextureLayered(true) {}
};

class TextureArray : public TextureLayered {

	GDCLASS(TextureArray, TextureLayered);

public:
	TextureArray() :
			TextureLayered(false) {}
};

class ResourceFormatLoaderTextureLayered : public ResourceFormatLoader {
public:
	virtual RES load(const String &p_path, const String &p_original_path = "", Error *r_error = NULL);
	virtual void get_recognized_extensions(List<String> *p_extensions) const;
	virtual bool handles_type(const String &p_type) const;
	virtual String get_resource_type(const String &p_path) const;
};

class CurveTexture : public Texture {

	GDCLASS(CurveTexture, Texture);
	RES_BASE_EXTENSION("curvetex")

private:
	RID _texture;
	Ref<Curve> _curve;
	int _width;

	void _update();

protected:
	static void _bind_methods();

public:
	void set_width(int p_width);
	int get_width() const;

	void ensure_default_setup(float p_min = 0, float p_max = 1);

	void set_curve(Ref<Curve> p_curve);
	Ref<Curve> get_curve() const;

	virtual RID get_rid() const;

	virtual int get_height() const { return 1; }
	virtual bool has_alpha() const { return false; }

	virtual void set_flags(uint32_t p_flags) {}
	virtual uint32_t get_flags() const { return FLAG_FILTER; }

	CurveTexture();
	~CurveTexture();
};
/*
	enum CubeMapSide {

		CUBEMAP_LEFT,
		CUBEMAP_RIGHT,
		CUBEMAP_BOTTOM,
		CUBEMAP_TOP,
		CUBEMAP_FRONT,
		CUBEMAP_BACK,
	};

*/
//VARIANT_ENUM_CAST( Texture::CubeMapSide );

class GradientTexture : public Texture {
	GDCLASS(GradientTexture, Texture);

public:
	struct Point {

		float offset;
		Color color;
		bool operator<(const Point &p_ponit) const {
			return offset < p_ponit.offset;
		}
	};

private:
	Ref<Gradient> gradient;
	bool update_pending;
	RID texture;
	int width;

	void _queue_update();
	void _update();

protected:
	static void _bind_methods();

public:
	void set_gradient(Ref<Gradient> p_gradient);
	Ref<Gradient> get_gradient() const;

	void set_width(int p_width);
	int get_width() const;

	virtual RID get_rid() const { return texture; }
	virtual int get_height() const { return 1; }
	virtual bool has_alpha() const { return true; }

	virtual void set_flags(uint32_t p_flags) {}
	virtual uint32_t get_flags() const { return FLAG_FILTER; }

	virtual Ref<Image> get_data() const;

	GradientTexture();
	virtual ~GradientTexture();
};

class ProxyTexture : public Texture {
	GDCLASS(ProxyTexture, Texture);

private:
	RID proxy;
	Ref<Texture> base;

protected:
	static void _bind_methods();

public:
	void set_base(const Ref<Texture> &p_texture);
	Ref<Texture> get_base() const;

	virtual int get_width() const;
	virtual int get_height() const;
	virtual RID get_rid() const;

	virtual bool has_alpha() const;

	virtual void set_flags(uint32_t p_flags);
	virtual uint32_t get_flags() const;

	ProxyTexture();
	~ProxyTexture();
};

class AnimatedTexture : public Texture {
	GDCLASS(AnimatedTexture, Texture);

	//use readers writers lock for this, since its far more times read than written to
	RWLock rw_lock;

public:
	enum {
		MAX_FRAMES = 256
	};

private:
	RID proxy;

	struct Frame {

		Ref<Texture> texture;
		float delay_sec;

		Frame() {
			delay_sec = 0;
		}
	};

	Frame frames[MAX_FRAMES];
	int frame_count;
	int current_frame;
	bool pause;
	bool oneshot;
	float fps;

	float time;

	uint64_t prev_ticks;

	void _update_proxy();

protected:
	static void _bind_methods();
	void _validate_property(PropertyInfo &property) const;

public:
	void set_frames(int p_frames);
	int get_frames() const;

	void set_current_frame(int p_frame);
	int get_current_frame() const;

	void set_pause(bool p_pause);
	bool get_pause() const;

	void set_oneshot(bool p_oneshot);
	bool get_oneshot() const;

	void set_frame_texture(int p_frame, const Ref<Texture> &p_texture);
	Ref<Texture> get_frame_texture(int p_frame) const;

	void set_frame_delay(int p_frame, float p_delay_sec);
	float get_frame_delay(int p_frame) const;

	void set_fps(float p_fps);
	float get_fps() const;

	virtual int get_width() const;
	virtual int get_height() const;
	virtual RID get_rid() const;

	virtual bool has_alpha() const;

	virtual void set_flags(uint32_t p_flags);
	virtual uint32_t get_flags() const;

	virtual Ref<Image> get_data() const;

	bool is_pixel_opaque(int p_x, int p_y) const;

	AnimatedTexture();
	~AnimatedTexture();
};

class CameraTexture : public Texture {
	GDCLASS(CameraTexture, Texture);

private:
	int camera_feed_id;
	CameraServer::FeedImage which_feed;

protected:
	static void _bind_methods();

public:
	virtual int get_width() const;
	virtual int get_height() const;
	virtual RID get_rid() const;
	virtual bool has_alpha() const;

	virtual void set_flags(uint32_t p_flags);
	virtual uint32_t get_flags() const;

	virtual Ref<Image> get_data() const;

	void set_camera_feed_id(int p_new_id);
	int get_camera_feed_id() const;

	void set_which_feed(CameraServer::FeedImage p_which);
	CameraServer::FeedImage get_which_feed() const;

	void set_camera_active(bool p_active);
	bool get_camera_active() const;

	CameraTexture();
	~CameraTexture();
};

// External textures as defined by https://www.khronos.org/registry/OpenGL/extensions/OES/OES_EGL_image_external.txt
class ExternalTexture : public Texture {
	GDCLASS(ExternalTexture, Texture);

private:
	RID texture;
	Size2 size;

protected:
	static void _bind_methods();

public:
	uint32_t get_external_texture_id();

	virtual Size2 get_size() const;
	void set_size(const Size2 &p_size);

	virtual int get_width() const;
	virtual int get_height() const;

	virtual RID get_rid() const;
	virtual bool has_alpha() const;

	virtual void set_flags(uint32_t p_flags);
	virtual uint32_t get_flags() const;

	ExternalTexture();
	~ExternalTexture();
};

#endif