/*************************************************************************/
/*  texture.cpp                                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2017 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.                */
/*************************************************************************/
#include "texture.h"
#include "core/os/os.h"
#include "io/image_loader.h"

Size2 Texture::get_size() const {

	return Size2(get_width(), get_height());
}

void Texture::draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate, bool p_transpose) const {

	VisualServer::get_singleton()->canvas_item_add_texture_rect(p_canvas_item, Rect2(p_pos, get_size()), get_rid(), false, p_modulate, p_transpose);
}
void Texture::draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile, const Color &p_modulate, bool p_transpose) const {

	VisualServer::get_singleton()->canvas_item_add_texture_rect(p_canvas_item, p_rect, get_rid(), p_tile, p_modulate, p_transpose);
}
void Texture::draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate, bool p_transpose) const {

	VisualServer::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, p_rect, get_rid(), p_src_rect, p_modulate, p_transpose);
}

bool Texture::get_rect_region(const Rect2 &p_rect, const Rect2 &p_src_rect, Rect2 &r_rect, Rect2 &r_src_rect) const {

	r_rect = p_rect;
	r_src_rect = p_src_rect;

	return true;
}

void Texture::_bind_methods() {

	ClassDB::bind_method(D_METHOD("get_width"), &Texture::get_width);
	ClassDB::bind_method(D_METHOD("get_height"), &Texture::get_height);
	ClassDB::bind_method(D_METHOD("get_size"), &Texture::get_size);
	ClassDB::bind_method(D_METHOD("has_alpha"), &Texture::has_alpha);
	ClassDB::bind_method(D_METHOD("set_flags", "flags"), &Texture::set_flags);
	ClassDB::bind_method(D_METHOD("get_flags"), &Texture::get_flags);
	ClassDB::bind_method(D_METHOD("draw", "canvas_item", "pos", "modulate", "transpose"), &Texture::draw, DEFVAL(Color(1, 1, 1)), DEFVAL(false));
	ClassDB::bind_method(D_METHOD("draw_rect", "canvas_item", "rect", "tile", "modulate", "transpose"), &Texture::draw_rect, DEFVAL(Color(1, 1, 1)), DEFVAL(false));
	ClassDB::bind_method(D_METHOD("draw_rect_region", "canvas_item", "rect", "src_rect", "modulate", "transpose"), &Texture::draw_rect_region, DEFVAL(Color(1, 1, 1)), DEFVAL(false));

	BIND_CONSTANT(FLAG_MIPMAPS);
	BIND_CONSTANT(FLAG_REPEAT);
	BIND_CONSTANT(FLAG_FILTER);
	BIND_CONSTANT(FLAG_VIDEO_SURFACE);
	BIND_CONSTANT(FLAGS_DEFAULT);
	BIND_CONSTANT(FLAG_ANISOTROPIC_FILTER);
	BIND_CONSTANT(FLAG_CONVERT_TO_LINEAR);
	BIND_CONSTANT(FLAG_MIRRORED_REPEAT);
}

Texture::Texture() {
}

/////////////////////

void ImageTexture::reload_from_file() {

	String path = get_path();
	if (!path.is_resource_file())
		return;

	uint32_t flags = get_flags();
	Image img;

	Error err = ImageLoader::load_image(path, &img);
	ERR_FAIL_COND(err != OK);

	create_from_image(img, flags);
}

bool ImageTexture::_set(const StringName &p_name, const Variant &p_value) {

	if (p_name == "image" && p_value.get_type() == Variant::IMAGE)
		create_from_image(p_value, flags);
	else if (p_name == "flags")
		if (w * h == 0)
			flags = p_value;
		else
			set_flags(p_value);
	else if (p_name == "size") {
		Size2 s = p_value;
		w = s.width;
		h = s.height;
		VisualServer::get_singleton()->texture_set_size_override(texture, w, h);
	} else if (p_name == "storage") {
		storage = Storage(p_value.operator int());
	} else if (p_name == "lossy_quality") {
		lossy_storage_quality = p_value;
	} else if (p_name == "_data") {
		_set_data(p_value);
	} else
		return false;

	return true;
}

bool ImageTexture::_get(const StringName &p_name, Variant &r_ret) const {

	if (p_name == "image_data") {

	} else if (p_name == "image")
		r_ret = get_data();
	else if (p_name == "flags")
		r_ret = flags;
	else if (p_name == "size")
		r_ret = Size2(w, h);
	else if (p_name == "storage")
		r_ret = storage;
	else if (p_name == "lossy_quality")
		r_ret = lossy_storage_quality;
	else
		return false;

	return true;
}

void ImageTexture::_get_property_list(List<PropertyInfo> *p_list) const {

	PropertyHint img_hint = PROPERTY_HINT_NONE;
	if (storage == STORAGE_COMPRESS_LOSSY) {
		img_hint = PROPERTY_HINT_IMAGE_COMPRESS_LOSSY;
	} else if (storage == STORAGE_COMPRESS_LOSSLESS) {
		img_hint = PROPERTY_HINT_IMAGE_COMPRESS_LOSSLESS;
	}

	p_list->push_back(PropertyInfo(Variant::INT, "flags", PROPERTY_HINT_FLAGS, "Mipmaps,Repeat,Filter,Anisotropic,sRGB,Mirrored Repeat"));
	p_list->push_back(PropertyInfo(Variant::IMAGE, "image", img_hint, String::num(lossy_storage_quality)));
	p_list->push_back(PropertyInfo(Variant::VECTOR2, "size", PROPERTY_HINT_NONE, ""));
	p_list->push_back(PropertyInfo(Variant::INT, "storage", PROPERTY_HINT_ENUM, "Uncompressed,Compress Lossy,Compress Lossless"));
	p_list->push_back(PropertyInfo(Variant::REAL, "lossy_quality", PROPERTY_HINT_RANGE, "0.0,1.0,0.01"));
}

void ImageTexture::_reload_hook(const RID &p_hook) {

	String path = get_path();
	if (!path.is_resource_file())
		return;

	Image img;
	Error err = ImageLoader::load_image(path, &img);

	ERR_FAIL_COND(err != OK);

	VisualServer::get_singleton()->texture_set_data(texture, img);

	_change_notify();
}

void ImageTexture::create(int p_width, int p_height, Image::Format p_format, uint32_t p_flags) {

	flags = p_flags;
	VisualServer::get_singleton()->texture_allocate(texture, p_width, p_height, p_format, p_flags);
	format = p_format;
	w = p_width;
	h = p_height;
}
void ImageTexture::create_from_image(const Image &p_image, uint32_t p_flags) {

	flags = p_flags;
	w = p_image.get_width();
	h = p_image.get_height();
	format = p_image.get_format();

	VisualServer::get_singleton()->texture_allocate(texture, p_image.get_width(), p_image.get_height(), p_image.get_format(), p_flags);
	VisualServer::get_singleton()->texture_set_data(texture, p_image);
	_change_notify();
}

void ImageTexture::set_flags(uint32_t p_flags) {

	/*	uint32_t cube = flags & FLAG_CUBEMAP;
	if (flags == p_flags&cube)
		return;

	flags=p_flags|cube;	*/
	flags = p_flags;
	VisualServer::get_singleton()->texture_set_flags(texture, p_flags);
}

uint32_t ImageTexture::get_flags() const {

	return ImageTexture::flags;
}

Image::Format ImageTexture::get_format() const {

	return format;
}

void ImageTexture::load(const String &p_path) {

	Image img;
	img.load(p_path);
	create_from_image(img);
}

void ImageTexture::set_data(const Image &p_image) {

	VisualServer::get_singleton()->texture_set_data(texture, p_image);

	_change_notify();
}

void ImageTexture::_resource_path_changed() {

	String path = get_path();
}

Image ImageTexture::get_data() const {

	return VisualServer::get_singleton()->texture_get_data(texture);
}

int ImageTexture::get_width() const {

	return w;
}

int ImageTexture::get_height() const {

	return h;
}

RID ImageTexture::get_rid() const {

	return texture;
}

void ImageTexture::fix_alpha_edges() {

	if (format == Image::FORMAT_RGBA8 /*&& !(flags&FLAG_CUBEMAP)*/) {

		Image img = get_data();
		img.fix_alpha_edges();
		set_data(img);
	}
}

void ImageTexture::premultiply_alpha() {

	if (format == Image::FORMAT_RGBA8 /*&& !(flags&FLAG_CUBEMAP)*/) {

		Image img = get_data();
		img.premultiply_alpha();
		set_data(img);
	}
}

void ImageTexture::normal_to_xy() {

	Image img = get_data();
	img.normalmap_to_xy();
	create_from_image(img, flags);
}

void ImageTexture::shrink_x2_and_keep_size() {

	Size2 sizeov = get_size();
	Image img = get_data();
	img.resize(img.get_width() / 2, img.get_height() / 2, Image::INTERPOLATE_BILINEAR);
	create_from_image(img, flags);
	set_size_override(sizeov);
}

bool ImageTexture::has_alpha() const {

	return (format == Image::FORMAT_LA8 || format == Image::FORMAT_RGBA8);
}

void ImageTexture::draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate, bool p_transpose) const {

	if ((w | h) == 0)
		return;
	VisualServer::get_singleton()->canvas_item_add_texture_rect(p_canvas_item, Rect2(p_pos, Size2(w, h)), texture, false, p_modulate, p_transpose);
}
void ImageTexture::draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile, const Color &p_modulate, bool p_transpose) const {

	if ((w | h) == 0)
		return;
	VisualServer::get_singleton()->canvas_item_add_texture_rect(p_canvas_item, p_rect, texture, p_tile, p_modulate, p_transpose);
}
void ImageTexture::draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate, bool p_transpose) const {

	if ((w | h) == 0)
		return;
	VisualServer::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, p_rect, texture, p_src_rect, p_modulate, p_transpose);
}

void ImageTexture::set_size_override(const Size2 &p_size) {

	Size2 s = p_size;
	if (s.x != 0)
		w = s.x;
	if (s.y != 0)
		h = s.y;
	VisualServer::get_singleton()->texture_set_size_override(texture, w, h);
}

void ImageTexture::set_path(const String &p_path, bool p_take_over) {

	if (texture.is_valid()) {
		VisualServer::get_singleton()->texture_set_path(texture, p_path);
	}

	Resource::set_path(p_path, p_take_over);
}

void ImageTexture::set_storage(Storage p_storage) {

	storage = p_storage;
}

ImageTexture::Storage ImageTexture::get_storage() const {

	return storage;
}

void ImageTexture::set_lossy_storage_quality(float p_lossy_storage_quality) {

	lossy_storage_quality = p_lossy_storage_quality;
}

float ImageTexture::get_lossy_storage_quality() const {

	return lossy_storage_quality;
}

void ImageTexture::_set_data(Dictionary p_data) {

	Image img = p_data["image"];
	uint32_t flags = p_data["flags"];

	create_from_image(img, flags);

	set_storage(Storage(p_data["storage"].operator int()));
	set_lossy_storage_quality(p_data["lossy_quality"]);

	set_size_override(p_data["size"]);
};

void ImageTexture::_bind_methods() {

	ClassDB::bind_method(D_METHOD("create", "width", "height", "format", "flags"), &ImageTexture::create, DEFVAL(FLAGS_DEFAULT));
	ClassDB::bind_method(D_METHOD("create_from_image", "image", "flags"), &ImageTexture::create_from_image, DEFVAL(FLAGS_DEFAULT));
	ClassDB::bind_method(D_METHOD("get_format"), &ImageTexture::get_format);
	ClassDB::bind_method(D_METHOD("load", "path"), &ImageTexture::load);
	ClassDB::bind_method(D_METHOD("set_data", "image"), &ImageTexture::set_data);
	ClassDB::bind_method(D_METHOD("get_data", "cube_side"), &ImageTexture::get_data);
	ClassDB::bind_method(D_METHOD("set_storage", "mode"), &ImageTexture::set_storage);
	ClassDB::bind_method(D_METHOD("get_storage"), &ImageTexture::get_storage);
	ClassDB::bind_method(D_METHOD("set_lossy_storage_quality", "quality"), &ImageTexture::set_lossy_storage_quality);
	ClassDB::bind_method(D_METHOD("get_lossy_storage_quality"), &ImageTexture::get_lossy_storage_quality);
	ClassDB::bind_method(D_METHOD("fix_alpha_edges"), &ImageTexture::fix_alpha_edges);
	ClassDB::bind_method(D_METHOD("premultiply_alpha"), &ImageTexture::premultiply_alpha);
	ClassDB::bind_method(D_METHOD("normal_to_xy"), &ImageTexture::normal_to_xy);
	ClassDB::bind_method(D_METHOD("shrink_x2_and_keep_size"), &ImageTexture::shrink_x2_and_keep_size);

	ClassDB::bind_method(D_METHOD("set_size_override", "size"), &ImageTexture::set_size_override);
	ClassDB::set_method_flags(get_class_static(), _scs_create("fix_alpha_edges"), METHOD_FLAGS_DEFAULT | METHOD_FLAG_EDITOR);
	ClassDB::set_method_flags(get_class_static(), _scs_create("premultiply_alpha"), METHOD_FLAGS_DEFAULT | METHOD_FLAG_EDITOR);
	ClassDB::set_method_flags(get_class_static(), _scs_create("normal_to_xy"), METHOD_FLAGS_DEFAULT | METHOD_FLAG_EDITOR);
	ClassDB::set_method_flags(get_class_static(), _scs_create("shrink_x2_and_keep_size"), METHOD_FLAGS_DEFAULT | METHOD_FLAG_EDITOR);
	ClassDB::bind_method(D_METHOD("_reload_hook", "rid"), &ImageTexture::_reload_hook);

	BIND_CONSTANT(STORAGE_RAW);
	BIND_CONSTANT(STORAGE_COMPRESS_LOSSY);
	BIND_CONSTANT(STORAGE_COMPRESS_LOSSLESS);
}

ImageTexture::ImageTexture() {

	w = h = 0;
	flags = FLAGS_DEFAULT;
	texture = VisualServer::get_singleton()->texture_create();
	storage = STORAGE_RAW;
	lossy_storage_quality = 0.7;
}

ImageTexture::~ImageTexture() {

	VisualServer::get_singleton()->free(texture);
}

//////////////////////////////////////////

void StreamTexture::_requested_3d(void *p_ud) {

	StreamTexture *st = (StreamTexture *)p_ud;
	Ref<StreamTexture> stex(st);
	ERR_FAIL_COND(!request_3d_callback);
	request_3d_callback(stex);
}

void StreamTexture::_requested_srgb(void *p_ud) {

	StreamTexture *st = (StreamTexture *)p_ud;
	Ref<StreamTexture> stex(st);
	ERR_FAIL_COND(!request_srgb_callback);
	request_srgb_callback(stex);
}

StreamTexture::TextureFormatRequestCallback StreamTexture::request_3d_callback = NULL;
StreamTexture::TextureFormatRequestCallback StreamTexture::request_srgb_callback = NULL;

uint32_t StreamTexture::get_flags() const {

	return flags;
}
Image::Format StreamTexture::get_format() const {

	return format;
}

Error StreamTexture::_load_data(const String &p_path, int &tw, int &th, int &flags, Image &image, int p_size_limit) {

	FileAccess *f = FileAccess::open(p_path, FileAccess::READ);
	ERR_FAIL_COND_V(!f, ERR_CANT_OPEN);

	uint8_t header[4];
	f->get_buffer(header, 4);
	if (header[0] != 'G' || header[1] != 'D' || header[2] != 'S' || header[3] != 'T') {
		memdelete(f);
		ERR_FAIL_COND_V(header[0] != 'G' || header[1] != 'D' || header[2] != 'S' || header[3] != 'T', ERR_FILE_CORRUPT);
	}

	tw = f->get_32();
	th = f->get_32();
	flags = f->get_32(); //texture flags!
	uint32_t df = f->get_32(); //data format

	print_line("width: " + itos(tw));
	print_line("height: " + itos(th));
	print_line("flags: " + itos(flags));
	print_line("df: " + itos(df));

	if (request_3d_callback && df & FORMAT_BIT_DETECT_3D) {
		print_line("request detect 3D at " + p_path);
		VS::get_singleton()->texture_set_detect_3d_callback(texture, _requested_3d, this);
	} else {
		print_line("not requesting detect 3D at " + p_path);
		VS::get_singleton()->texture_set_detect_3d_callback(texture, NULL, NULL);
	}

	if (request_srgb_callback && df & FORMAT_BIT_DETECT_SRGB) {
		print_line("request detect srgb at " + p_path);
		VS::get_singleton()->texture_set_detect_srgb_callback(texture, _requested_srgb, this);
	} else {
		VS::get_singleton()->texture_set_detect_srgb_callback(texture, NULL, NULL);
		print_line("not requesting detect srgb at " + p_path);
	}

	if (!(df & FORMAT_BIT_STREAM)) {
		p_size_limit = 0;
	}

	if (df & FORMAT_BIT_LOSSLESS || df & FORMAT_BIT_LOSSY) {
		//look for a PNG or WEBP file inside

		int sw = tw;
		int sh = th;

		uint32_t mipmaps = f->get_32();
		uint32_t size = f->get_32();

		print_line("mipmaps: " + itos(mipmaps));

		while (mipmaps > 1 && p_size_limit > 0 && (sw > p_size_limit || sh > p_size_limit)) {

			f->seek(f->get_pos() + size);
			mipmaps = f->get_32();
			size = f->get_32();

			sw = MAX(sw >> 1, 1);
			sh = MAX(sh >> 1, 1);
			mipmaps--;
		}

		//mipmaps need to be read independently, they will be later combined
		Vector<Image> mipmap_images;
		int total_size = 0;

		for (int i = 0; i < mipmaps; i++) {

			if (i > 0) {
				size = f->get_32();
			}

			PoolVector<uint8_t> pv;
			pv.resize(size);
			{
				PoolVector<uint8_t>::Write w = pv.write();
				f->get_buffer(w.ptr(), size);
			}

			Image img;
			if (df & FORMAT_BIT_LOSSLESS) {
				img = Image::lossless_unpacker(pv);
			} else {
				img = Image::lossy_unpacker(pv);
			}

			if (img.empty()) {
				memdelete(f);
				ERR_FAIL_COND_V(img.empty(), ERR_FILE_CORRUPT);
			}
			total_size += img.get_data().size();

			mipmap_images.push_back(img);
		}

		print_line("mipmap read total: " + itos(mipmap_images.size()));

		memdelete(f); //no longer needed

		if (mipmap_images.size() == 1) {

			image = mipmap_images[0];
			return OK;

		} else {
			PoolVector<uint8_t> img_data;
			img_data.resize(total_size);

			{
				PoolVector<uint8_t>::Write w = img_data.write();

				int ofs = 0;
				for (int i = 0; i < mipmap_images.size(); i++) {

					PoolVector<uint8_t> id = mipmap_images[i].get_data();
					int len = id.size();
					PoolVector<uint8_t>::Read r = id.read();
					copymem(&w[ofs], r.ptr(), len);
					ofs += len;
				}
			}

			image = Image(sw, sh, true, mipmap_images[0].get_format(), img_data);
			return OK;
		}

	} else {

		//look for regular format
		Image::Format format = (Image::Format)(df & FORMAT_MASK_IMAGE_FORMAT);
		bool mipmaps = df & FORMAT_BIT_HAS_MIPMAPS;

		if (!mipmaps) {
			int size = Image::get_image_data_size(tw, th, format, 0);

			PoolVector<uint8_t> img_data;
			img_data.resize(size);

			{
				PoolVector<uint8_t>::Write w = img_data.write();
				f->get_buffer(w.ptr(), size);
			}

			memdelete(f);

			image = Image(tw, th, false, format, img_data);
			return OK;
		} else {

			int sw = tw;
			int sh = th;

			int mipmaps = Image::get_image_required_mipmaps(tw, th, format);
			int total_size = Image::get_image_data_size(tw, th, format, mipmaps);
			int idx = 0;
			int ofs = 0;

			while (mipmaps > 1 && p_size_limit > 0 && (sw > p_size_limit || sh > p_size_limit)) {

				sw = MAX(sw >> 1, 1);
				sh = MAX(sh >> 1, 1);
				mipmaps--;
				idx++;
			}

			if (idx > 0) {
				ofs = Image::get_image_data_size(tw, th, format, idx - 1);
			}

			if (total_size - ofs <= 0) {
				memdelete(f);
				ERR_FAIL_V(ERR_FILE_CORRUPT);
			}

			f->seek(f->get_pos() + ofs);

			PoolVector<uint8_t> img_data;
			img_data.resize(total_size - ofs);

			{
				PoolVector<uint8_t>::Write w = img_data.write();
				int bytes = f->get_buffer(w.ptr(), total_size - ofs);
				print_line("requested read: " + itos(total_size - ofs) + " but got: " + itos(bytes));

				memdelete(f);

				if (bytes != total_size - ofs) {
					ERR_FAIL_V(ERR_FILE_CORRUPT);
				}
			}

			image = Image(sw, sh, true, format, img_data);

			return OK;
		}
	}

	return ERR_BUG; //unreachable
}

Error StreamTexture::load(const String &p_path) {

	int lw, lh, lflags;
	Image image;
	Error err = _load_data(p_path, lw, lh, lflags, image);
	if (err)
		return err;

	VS::get_singleton()->texture_allocate(texture, image.get_width(), image.get_height(), image.get_format(), lflags);
	VS::get_singleton()->texture_set_data(texture, image);

	w = lw;
	h = lh;
	flags = lflags;
	path_to_file = p_path;
	format = image.get_format();

	return OK;
}
String StreamTexture::get_load_path() const {

	return path_to_file;
}

int StreamTexture::get_width() const {

	return w;
}
int StreamTexture::get_height() const {

	return h;
}
RID StreamTexture::get_rid() const {

	return texture;
}

void StreamTexture::draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate, bool p_transpose) const {

	if ((w | h) == 0)
		return;
	VisualServer::get_singleton()->canvas_item_add_texture_rect(p_canvas_item, Rect2(p_pos, Size2(w, h)), texture, false, p_modulate, p_transpose);
}
void StreamTexture::draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile, const Color &p_modulate, bool p_transpose) const {

	if ((w | h) == 0)
		return;
	VisualServer::get_singleton()->canvas_item_add_texture_rect(p_canvas_item, p_rect, texture, p_tile, p_modulate, p_transpose);
}
void StreamTexture::draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate, bool p_transpose) const {

	if ((w | h) == 0)
		return;
	VisualServer::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, p_rect, texture, p_src_rect, p_modulate, p_transpose);
}

bool StreamTexture::has_alpha() const {

	return false;
}

Image StreamTexture::get_data() const {

	return VS::get_singleton()->texture_get_data(texture);
}

void StreamTexture::set_flags(uint32_t p_flags) {
}

void StreamTexture::reload_from_file() {

#ifdef TOOLS_ENABLED
	String ipath = get_import_path();
	if (ipath.is_resource_file() && ipath != path_to_file) {
		path_to_file = ipath;
	}
#endif
	load(path_to_file);
}

void StreamTexture::_bind_methods() {

	ClassDB::bind_method(D_METHOD("load", "path"), &StreamTexture::load);
	ClassDB::bind_method(D_METHOD("get_load_path"), &StreamTexture::get_load_path);

	ADD_PROPERTY(PropertyInfo(Variant::STRING, "load_path", PROPERTY_HINT_FILE, "*.stex"), "load", "get_load_path");
}

StreamTexture::StreamTexture() {

	format = Image::FORMAT_MAX;
	flags = 0;
	w = 0;
	h = 0;

	texture = VS::get_singleton()->texture_create();
}

StreamTexture::~StreamTexture() {

	VS::get_singleton()->free(texture);
}

RES ResourceFormatLoaderStreamTexture::load(const String &p_path, const String &p_original_path, Error *r_error) {

	Ref<StreamTexture> st;
	st.instance();
	Error err = st->load(p_path);
	if (r_error)
		*r_error = err;
	if (err != OK)
		return RES();

	return st;
}

void ResourceFormatLoaderStreamTexture::get_recognized_extensions(List<String> *p_extensions) const {

	p_extensions->push_back("stex");
}
bool ResourceFormatLoaderStreamTexture::handles_type(const String &p_type) const {
	return p_type == "StreamTexture";
}
String ResourceFormatLoaderStreamTexture::get_resource_type(const String &p_path) const {

	if (p_path.get_extension().to_lower() == "stex")
		return "StreamTexture";
	return "";
}

//////////////////////////////////////////

int AtlasTexture::get_width() const {

	if (region.size.width == 0) {
		if (atlas.is_valid())
			return atlas->get_width();
		return 1;
	} else {
		return region.size.width + margin.size.width;
	}
}
int AtlasTexture::get_height() const {

	if (region.size.height == 0) {
		if (atlas.is_valid())
			return atlas->get_height();
		return 1;
	} else {
		return region.size.height + margin.size.height;
	}
}
RID AtlasTexture::get_rid() const {

	if (atlas.is_valid())
		return atlas->get_rid();

	return RID();
}

bool AtlasTexture::has_alpha() const {

	if (atlas.is_valid())
		return atlas->has_alpha();

	return false;
}

void AtlasTexture::set_flags(uint32_t p_flags) {

	if (atlas.is_valid())
		atlas->set_flags(p_flags);
}

uint32_t AtlasTexture::get_flags() const {

	if (atlas.is_valid())
		return atlas->get_flags();

	return 0;
}

void AtlasTexture::set_atlas(const Ref<Texture> &p_atlas) {

	if (atlas == p_atlas)
		return;
	atlas = p_atlas;
	emit_changed();
	emit_signal("atlas_changed");
}
Ref<Texture> AtlasTexture::get_atlas() const {

	return atlas;
}

void AtlasTexture::set_region(const Rect2 &p_region) {

	region = p_region;
	emit_changed();
}

Rect2 AtlasTexture::get_region() const {

	return region;
}

void AtlasTexture::set_margin(const Rect2 &p_margin) {

	margin = p_margin;
	emit_changed();
}

Rect2 AtlasTexture::get_margin() const {

	return margin;
}

void AtlasTexture::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_atlas", "atlas:Texture"), &AtlasTexture::set_atlas);
	ClassDB::bind_method(D_METHOD("get_atlas:Texture"), &AtlasTexture::get_atlas);

	ClassDB::bind_method(D_METHOD("set_region", "region"), &AtlasTexture::set_region);
	ClassDB::bind_method(D_METHOD("get_region"), &AtlasTexture::get_region);

	ClassDB::bind_method(D_METHOD("set_margin", "margin"), &AtlasTexture::set_margin);
	ClassDB::bind_method(D_METHOD("get_margin"), &AtlasTexture::get_margin);

	ADD_SIGNAL(MethodInfo("atlas_changed"));

	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "atlas", PROPERTY_HINT_RESOURCE_TYPE, "Texture"), "set_atlas", "get_atlas");
	ADD_PROPERTY(PropertyInfo(Variant::RECT2, "region"), "set_region", "get_region");
	ADD_PROPERTY(PropertyInfo(Variant::RECT2, "margin"), "set_margin", "get_margin");
}

void AtlasTexture::draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate, bool p_transpose) const {

	Rect2 rc = region;

	if (!atlas.is_valid())
		return;

	if (rc.size.width == 0) {
		rc.size.width = atlas->get_width();
	}

	if (rc.size.height == 0) {
		rc.size.height = atlas->get_height();
	}

	VS::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, Rect2(p_pos + margin.pos, rc.size), atlas->get_rid(), rc, p_modulate, p_transpose);
}

void AtlasTexture::draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile, const Color &p_modulate, bool p_transpose) const {

	Rect2 rc = region;

	if (!atlas.is_valid())
		return;

	if (rc.size.width == 0) {
		rc.size.width = atlas->get_width();
	}

	if (rc.size.height == 0) {
		rc.size.height = atlas->get_height();
	}

	Vector2 scale = p_rect.size / (region.size + margin.size);
	Rect2 dr(p_rect.pos + margin.pos * scale, rc.size * scale);

	VS::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, dr, atlas->get_rid(), rc, p_modulate, p_transpose);
}
void AtlasTexture::draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate, bool p_transpose) const {

	//this might not necessarily work well if using a rect, needs to be fixed properly
	Rect2 rc = region;

	if (!atlas.is_valid())
		return;

	Rect2 src = p_src_rect;
	src.pos += (rc.pos - margin.pos);
	Rect2 src_c = rc.clip(src);
	if (src_c.size == Size2())
		return;
	Vector2 ofs = (src_c.pos - src.pos);

	Vector2 scale = p_rect.size / p_src_rect.size;
	if (scale.x < 0) {
		float mx = (margin.size.width - margin.pos.x);
		mx -= margin.pos.x;
		ofs.x = -(ofs.x + mx);
	}
	if (scale.y < 0) {
		float my = margin.size.height - margin.pos.y;
		my -= margin.pos.y;
		ofs.y = -(ofs.y + my);
	}
	Rect2 dr(p_rect.pos + ofs * scale, src_c.size * scale);

	VS::get_singleton()->canvas_item_add_texture_rect_region(p_canvas_item, dr, atlas->get_rid(), src_c, p_modulate, p_transpose);
}

bool AtlasTexture::get_rect_region(const Rect2 &p_rect, const Rect2 &p_src_rect, Rect2 &r_rect, Rect2 &r_src_rect) const {

	Rect2 rc = region;

	if (!atlas.is_valid())
		return false;

	Rect2 src = p_src_rect;
	src.pos += (rc.pos - margin.pos);
	Rect2 src_c = rc.clip(src);
	if (src_c.size == Size2())
		return false;
	Vector2 ofs = (src_c.pos - src.pos);

	Vector2 scale = p_rect.size / p_src_rect.size;
	if (scale.x < 0) {
		float mx = (margin.size.width - margin.pos.x);
		mx -= margin.pos.x;
		ofs.x = -(ofs.x + mx);
	}
	if (scale.y < 0) {
		float my = margin.size.height - margin.pos.y;
		my -= margin.pos.y;
		ofs.y = -(ofs.y + my);
	}
	Rect2 dr(p_rect.pos + ofs * scale, src_c.size * scale);

	r_rect = dr;
	r_src_rect = src_c;
	return true;
}

AtlasTexture::AtlasTexture() {
}

//////////////////////////////////////////

int LargeTexture::get_width() const {

	return size.width;
}
int LargeTexture::get_height() const {

	return size.height;
}
RID LargeTexture::get_rid() const {

	return RID();
}

bool LargeTexture::has_alpha() const {

	for (int i = 0; i < pieces.size(); i++) {
		if (pieces[i].texture->has_alpha())
			return true;
	}

	return false;
}

void LargeTexture::set_flags(uint32_t p_flags) {

	for (int i = 0; i < pieces.size(); i++) {
		pieces[i].texture->set_flags(p_flags);
	}
}

uint32_t LargeTexture::get_flags() const {

	if (pieces.size())
		return pieces[0].texture->get_flags();

	return 0;
}

int LargeTexture::add_piece(const Point2 &p_offset, const Ref<Texture> &p_texture) {

	ERR_FAIL_COND_V(p_texture.is_null(), -1);
	Piece p;
	p.offset = p_offset;
	p.texture = p_texture;
	pieces.push_back(p);

	return pieces.size() - 1;
}

void LargeTexture::set_piece_offset(int p_idx, const Point2 &p_offset) {

	ERR_FAIL_INDEX(p_idx, pieces.size());
	pieces[p_idx].offset = p_offset;
};

void LargeTexture::set_piece_texture(int p_idx, const Ref<Texture> &p_texture) {

	ERR_FAIL_INDEX(p_idx, pieces.size());
	pieces[p_idx].texture = p_texture;
};

void LargeTexture::set_size(const Size2 &p_size) {

	size = p_size;
}
void LargeTexture::clear() {

	pieces.clear();
	size = Size2i();
}

Array LargeTexture::_get_data() const {

	Array arr;
	for (int i = 0; i < pieces.size(); i++) {
		arr.push_back(pieces[i].offset);
		arr.push_back(pieces[i].texture);
	}
	arr.push_back(Size2(size));
	return arr;
}
void LargeTexture::_set_data(const Array &p_array) {

	ERR_FAIL_COND(p_array.size() < 1);
	ERR_FAIL_COND(!(p_array.size() & 1));
	clear();
	for (int i = 0; i < p_array.size() - 1; i += 2) {
		add_piece(p_array[i], p_array[i + 1]);
	}
	size = Size2(p_array[p_array.size() - 1]);
}

int LargeTexture::get_piece_count() const {

	return pieces.size();
}
Vector2 LargeTexture::get_piece_offset(int p_idx) const {

	ERR_FAIL_INDEX_V(p_idx, pieces.size(), Vector2());
	return pieces[p_idx].offset;
}
Ref<Texture> LargeTexture::get_piece_texture(int p_idx) const {

	ERR_FAIL_INDEX_V(p_idx, pieces.size(), Ref<Texture>());
	return pieces[p_idx].texture;
}

void LargeTexture::_bind_methods() {

	ClassDB::bind_method(D_METHOD("add_piece", "ofs", "texture:Texture"), &LargeTexture::add_piece);
	ClassDB::bind_method(D_METHOD("set_piece_offset", "idx", "ofs"), &LargeTexture::set_piece_offset);
	ClassDB::bind_method(D_METHOD("set_piece_texture", "idx", "texture:Texture"), &LargeTexture::set_piece_texture);
	ClassDB::bind_method(D_METHOD("set_size", "size"), &LargeTexture::set_size);
	ClassDB::bind_method(D_METHOD("clear"), &LargeTexture::clear);

	ClassDB::bind_method(D_METHOD("get_piece_count"), &LargeTexture::get_piece_count);
	ClassDB::bind_method(D_METHOD("get_piece_offset", "idx"), &LargeTexture::get_piece_offset);
	ClassDB::bind_method(D_METHOD("get_piece_texture:Texture", "idx"), &LargeTexture::get_piece_texture);

	ClassDB::bind_method(D_METHOD("_set_data", "data"), &LargeTexture::_set_data);
	ClassDB::bind_method(D_METHOD("_get_data"), &LargeTexture::_get_data);

	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "_data", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR), "_set_data", "_get_data");
}

void LargeTexture::draw(RID p_canvas_item, const Point2 &p_pos, const Color &p_modulate, bool p_transpose) const {

	for (int i = 0; i < pieces.size(); i++) {

		// TODO
		pieces[i].texture->draw(p_canvas_item, pieces[i].offset + p_pos, p_modulate, p_transpose);
	}
}

void LargeTexture::draw_rect(RID p_canvas_item, const Rect2 &p_rect, bool p_tile, const Color &p_modulate, bool p_transpose) const {

	//tiling not supported for this
	if (size.x == 0 || size.y == 0)
		return;

	Size2 scale = p_rect.size / size;

	for (int i = 0; i < pieces.size(); i++) {

		// TODO
		pieces[i].texture->draw_rect(p_canvas_item, Rect2(pieces[i].offset * scale + p_rect.pos, pieces[i].texture->get_size() * scale), false, p_modulate, p_transpose);
	}
}
void LargeTexture::draw_rect_region(RID p_canvas_item, const Rect2 &p_rect, const Rect2 &p_src_rect, const Color &p_modulate, bool p_transpose) const {

	//tiling not supported for this
	if (p_src_rect.size.x == 0 || p_src_rect.size.y == 0)
		return;

	Size2 scale = p_rect.size / p_src_rect.size;

	for (int i = 0; i < pieces.size(); i++) {

		// TODO
		Rect2 rect(pieces[i].offset, pieces[i].texture->get_size());
		if (!p_src_rect.intersects(rect))
			continue;
		Rect2 local = p_src_rect.clip(rect);
		Rect2 target = local;
		target.size *= scale;
		target.pos = p_rect.pos + (p_src_rect.pos + rect.pos) * scale;
		local.pos -= rect.pos;
		pieces[i].texture->draw_rect_region(p_canvas_item, target, local, p_modulate, p_transpose);
	}
}

LargeTexture::LargeTexture() {
}

///////////////////////////////////////////////

void CubeMap::set_flags(uint32_t p_flags) {

	flags = p_flags;
	if (_is_valid())
		VS::get_singleton()->texture_set_flags(cubemap, flags | VS::TEXTURE_FLAG_CUBEMAP);
}

uint32_t CubeMap::get_flags() const {

	return flags;
}

void CubeMap::set_side(Side p_side, const Image &p_image) {

	ERR_FAIL_COND(p_image.empty());
	ERR_FAIL_INDEX(p_side, 6);
	if (!_is_valid()) {
		format = p_image.get_format();
		w = p_image.get_width();
		h = p_image.get_height();
		VS::get_singleton()->texture_allocate(cubemap, w, h, p_image.get_format(), flags | VS::TEXTURE_FLAG_CUBEMAP);
	}

	VS::get_singleton()->texture_set_data(cubemap, p_image, VS::CubeMapSide(p_side));
	valid[p_side] = true;
}

Image CubeMap::get_side(Side p_side) const {

	if (!valid[p_side])
		return Image();
	return VS::get_singleton()->texture_get_data(cubemap, VS::CubeMapSide(p_side));
}

Image::Format CubeMap::get_format() const {

	return format;
}
int CubeMap::get_width() const {

	return w;
}
int CubeMap::get_height() const {

	return h;
}

RID CubeMap::get_rid() const {

	return cubemap;
}

void CubeMap::set_storage(Storage p_storage) {

	storage = p_storage;
}

CubeMap::Storage CubeMap::get_storage() const {

	return storage;
}

void CubeMap::set_lossy_storage_quality(float p_lossy_storage_quality) {

	lossy_storage_quality = p_lossy_storage_quality;
}

float CubeMap::get_lossy_storage_quality() const {

	return lossy_storage_quality;
}

void CubeMap::set_path(const String &p_path, bool p_take_over) {

	if (cubemap.is_valid()) {
		VisualServer::get_singleton()->texture_set_path(cubemap, p_path);
	}

	Resource::set_path(p_path, p_take_over);
}

bool CubeMap::_set(const StringName &p_name, const Variant &p_value) {

	if (p_name == "side/left") {
		set_side(SIDE_LEFT, p_value);
	} else if (p_name == "side/right") {
		set_side(SIDE_RIGHT, p_value);
	} else if (p_name == "side/bottom") {
		set_side(SIDE_BOTTOM, p_value);
	} else if (p_name == "side/top") {
		set_side(SIDE_TOP, p_value);
	} else if (p_name == "side/front") {
		set_side(SIDE_FRONT, p_value);
	} else if (p_name == "side/back") {
		set_side(SIDE_BACK, p_value);
	} else if (p_name == "flags") {
		set_flags(p_value);
	} else if (p_name == "storage") {
		storage = Storage(p_value.operator int());
	} else if (p_name == "lossy_quality") {
		lossy_storage_quality = p_value;
	} else
		return false;

	return true;
}

bool CubeMap::_get(const StringName &p_name, Variant &r_ret) const {

	if (p_name == "side/left") {
		r_ret = get_side(SIDE_LEFT);
	} else if (p_name == "side/right") {
		r_ret = get_side(SIDE_RIGHT);
	} else if (p_name == "side/bottom") {
		r_ret = get_side(SIDE_BOTTOM);
	} else if (p_name == "side/top") {
		r_ret = get_side(SIDE_TOP);
	} else if (p_name == "side/front") {
		r_ret = get_side(SIDE_FRONT);
	} else if (p_name == "side/back") {
		r_ret = get_side(SIDE_BACK);
	} else if (p_name == "flags") {
		r_ret = flags;
	} else if (p_name == "storage") {
		r_ret = storage;
	} else if (p_name == "lossy_quality") {
		r_ret = lossy_storage_quality;
	} else
		return false;

	return true;
}

void CubeMap::_get_property_list(List<PropertyInfo> *p_list) const {

	PropertyHint img_hint = PROPERTY_HINT_NONE;
	if (storage == STORAGE_COMPRESS_LOSSY) {
		img_hint = PROPERTY_HINT_IMAGE_COMPRESS_LOSSY;
	} else if (storage == STORAGE_COMPRESS_LOSSLESS) {
		img_hint = PROPERTY_HINT_IMAGE_COMPRESS_LOSSLESS;
	}

	p_list->push_back(PropertyInfo(Variant::INT, "flags", PROPERTY_HINT_FLAGS, "Mipmaps,Repeat,Filter"));
	p_list->push_back(PropertyInfo(Variant::IMAGE, "side/left", img_hint, String::num(lossy_storage_quality)));
	p_list->push_back(PropertyInfo(Variant::IMAGE, "side/right", img_hint, String::num(lossy_storage_quality)));
	p_list->push_back(PropertyInfo(Variant::IMAGE, "side/bottom", img_hint, String::num(lossy_storage_quality)));
	p_list->push_back(PropertyInfo(Variant::IMAGE, "side/top", img_hint, String::num(lossy_storage_quality)));
	p_list->push_back(PropertyInfo(Variant::IMAGE, "side/front", img_hint, String::num(lossy_storage_quality)));
	p_list->push_back(PropertyInfo(Variant::IMAGE, "side/back", img_hint, String::num(lossy_storage_quality)));
	p_list->push_back(PropertyInfo(Variant::INT, "storage", PROPERTY_HINT_ENUM, "Uncompressed,Compress Lossy,Compress Lossless", PROPERTY_USAGE_EDITOR));
	p_list->push_back(PropertyInfo(Variant::REAL, "lossy_quality", PROPERTY_HINT_RANGE, "0.0,1.0,0.01"));
}

void CubeMap::_bind_methods() {

	ClassDB::bind_method(D_METHOD("get_width"), &CubeMap::get_width);
	ClassDB::bind_method(D_METHOD("get_height"), &CubeMap::get_height);
	//ClassDB::bind_method(D_METHOD("get_rid"),&CubeMap::get_rid);
	ClassDB::bind_method(D_METHOD("set_flags", "flags"), &CubeMap::set_flags);
	ClassDB::bind_method(D_METHOD("get_flags"), &CubeMap::get_flags);

	ClassDB::bind_method(D_METHOD("set_side", "side", "image"), &CubeMap::set_side);
	ClassDB::bind_method(D_METHOD("get_side", "side"), &CubeMap::get_side);
	ClassDB::bind_method(D_METHOD("set_storage", "mode"), &CubeMap::set_storage);
	ClassDB::bind_method(D_METHOD("get_storage"), &CubeMap::get_storage);
	ClassDB::bind_method(D_METHOD("set_lossy_storage_quality", "quality"), &CubeMap::set_lossy_storage_quality);
	ClassDB::bind_method(D_METHOD("get_lossy_storage_quality"), &CubeMap::get_lossy_storage_quality);

	BIND_CONSTANT(STORAGE_RAW);
	BIND_CONSTANT(STORAGE_COMPRESS_LOSSY);
	BIND_CONSTANT(STORAGE_COMPRESS_LOSSLESS);
	BIND_CONSTANT(SIDE_LEFT);
	BIND_CONSTANT(SIDE_RIGHT);
	BIND_CONSTANT(SIDE_BOTTOM);
	BIND_CONSTANT(SIDE_TOP);
	BIND_CONSTANT(SIDE_FRONT);
	BIND_CONSTANT(SIDE_BACK);
	BIND_CONSTANT(FLAG_MIPMAPS);
	BIND_CONSTANT(FLAG_REPEAT);
	BIND_CONSTANT(FLAG_FILTER);
	BIND_CONSTANT(FLAGS_DEFAULT);
}

CubeMap::CubeMap() {

	w = h = 0;
	flags = FLAGS_DEFAULT;
	for (int i = 0; i < 6; i++)
		valid[i] = false;
	cubemap = VisualServer::get_singleton()->texture_create();
	storage = STORAGE_RAW;
	lossy_storage_quality = 0.7;
}

CubeMap::~CubeMap() {

	VisualServer::get_singleton()->free(cubemap);
}

/*	BIND_CONSTANT( FLAG_CUBEMAP );
	BIND_CONSTANT( CUBEMAP_LEFT );
	BIND_CONSTANT( CUBEMAP_RIGHT );
	BIND_CONSTANT( CUBEMAP_BOTTOM );
	BIND_CONSTANT( CUBEMAP_TOP );
	BIND_CONSTANT( CUBEMAP_FRONT );
	BIND_CONSTANT( CUBEMAP_BACK );
*/
///////////////////////////

void CurveTexture::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_max", "max"), &CurveTexture::set_max);
	ClassDB::bind_method(D_METHOD("get_max"), &CurveTexture::get_max);

	ClassDB::bind_method(D_METHOD("set_min", "min"), &CurveTexture::set_min);
	ClassDB::bind_method(D_METHOD("get_min"), &CurveTexture::get_min);

	ClassDB::bind_method(D_METHOD("set_width", "width"), &CurveTexture::set_width);

	ClassDB::bind_method(D_METHOD("set_points", "points"), &CurveTexture::set_points);
	ClassDB::bind_method(D_METHOD("get_points"), &CurveTexture::get_points);

	ADD_PROPERTY(PropertyInfo(Variant::REAL, "min", PROPERTY_HINT_RANGE, "-1024,1024"), "set_min", "get_min");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "max", PROPERTY_HINT_RANGE, "-1024,1024"), "set_max", "get_max");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "width", PROPERTY_HINT_RANGE, "32,4096"), "set_width", "get_width");
	ADD_PROPERTY(PropertyInfo(Variant::POOL_VECTOR2_ARRAY, "points"), "set_points", "get_points");
}
void CurveTexture::set_max(float p_max) {

	max = p_max;
	emit_changed();
}
float CurveTexture::get_max() const {

	return max;
}

void CurveTexture::set_min(float p_min) {

	min = p_min;
	emit_changed();
}
float CurveTexture::get_min() const {

	return min;
}
void CurveTexture::set_width(int p_width) {

	ERR_FAIL_COND(p_width < 32 || p_width > 4096);
	width = p_width;
	if (points.size())
		set_points(points);
}
int CurveTexture::get_width() const {

	return width;
}

static void _plot_curve(const Vector2 &p_a, const Vector2 &p_b, const Vector2 &p_c, const Vector2 &p_d, float *p_heights, bool *p_useds, int p_width, float p_min, float p_max) {

	float geometry[4][4];
	float tmp1[4][4];
	float tmp2[4][4];
	float deltas[4][4];
	double x, dx, dx2, dx3;
	double y, dy, dy2, dy3;
	double d, d2, d3;
	int lastx;
	int newx;
	float lasty;
	float newy;
	int ntimes;
	int i, j;

	int xmax = p_width;

	/* construct the geometry matrix from the segment */
	for (i = 0; i < 4; i++) {
		geometry[i][2] = 0;
		geometry[i][3] = 0;
	}

	geometry[0][0] = (p_a[0] * xmax);
	geometry[1][0] = (p_b[0] * xmax);
	geometry[2][0] = (p_c[0] * xmax);
	geometry[3][0] = (p_d[0] * xmax);

	geometry[0][1] = (p_a[1]);
	geometry[1][1] = (p_b[1]);
	geometry[2][1] = (p_c[1]);
	geometry[3][1] = (p_d[1]);

	/* subdivide the curve ntimes (1000) times */
	ntimes = 4 * xmax;
	/* ntimes can be adjusted to give a finer or coarser curve */
	d = 1.0 / ntimes;
	d2 = d * d;
	d3 = d * d * d;

	/* construct a temporary matrix for determining the forward differencing deltas */
	tmp2[0][0] = 0;
	tmp2[0][1] = 0;
	tmp2[0][2] = 0;
	tmp2[0][3] = 1;
	tmp2[1][0] = d3;
	tmp2[1][1] = d2;
	tmp2[1][2] = d;
	tmp2[1][3] = 0;
	tmp2[2][0] = 6 * d3;
	tmp2[2][1] = 2 * d2;
	tmp2[2][2] = 0;
	tmp2[2][3] = 0;
	tmp2[3][0] = 6 * d3;
	tmp2[3][1] = 0;
	tmp2[3][2] = 0;
	tmp2[3][3] = 0;

	/* compose the basis and geometry matrices */

	static const float CR_basis[4][4] = {
		{ -0.5, 1.5, -1.5, 0.5 },
		{ 1.0, -2.5, 2.0, -0.5 },
		{ -0.5, 0.0, 0.5, 0.0 },
		{ 0.0, 1.0, 0.0, 0.0 },
	};

	for (i = 0; i < 4; i++) {
		for (j = 0; j < 4; j++) {
			tmp1[i][j] = (CR_basis[i][0] * geometry[0][j] +
						  CR_basis[i][1] * geometry[1][j] +
						  CR_basis[i][2] * geometry[2][j] +
						  CR_basis[i][3] * geometry[3][j]);
		}
	}
	/* compose the above results to get the deltas matrix */

	for (i = 0; i < 4; i++) {
		for (j = 0; j < 4; j++) {
			deltas[i][j] = (tmp2[i][0] * tmp1[0][j] +
							tmp2[i][1] * tmp1[1][j] +
							tmp2[i][2] * tmp1[2][j] +
							tmp2[i][3] * tmp1[3][j]);
		}
	}

	/* extract the x deltas */
	x = deltas[0][0];
	dx = deltas[1][0];
	dx2 = deltas[2][0];
	dx3 = deltas[3][0];

	/* extract the y deltas */
	y = deltas[0][1];
	dy = deltas[1][1];
	dy2 = deltas[2][1];
	dy3 = deltas[3][1];

	lastx = CLAMP(x, 0, xmax);
	lasty = y;

	p_heights[lastx] = lasty;
	p_useds[lastx] = true;

	/* loop over the curve */
	for (i = 0; i < ntimes; i++) {
		/* increment the x values */
		x += dx;
		dx += dx2;
		dx2 += dx3;

		/* increment the y values */
		y += dy;
		dy += dy2;
		dy2 += dy3;

		newx = CLAMP((Math::round(x)), 0, xmax);
		newy = CLAMP(y, p_min, p_max);

		/* if this point is different than the last one...then draw it */
		if ((lastx != newx) || (lasty != newy)) {
			p_useds[newx] = true;
			p_heights[newx] = newy;
		}

		lastx = newx;
		lasty = newy;
	}
}

void CurveTexture::set_points(const PoolVector<Vector2> &p_points) {

	points = p_points;

	PoolVector<uint8_t> data;
	PoolVector<bool> used;
	data.resize(width * sizeof(float));
	used.resize(width);
	{
		PoolVector<uint8_t>::Write wd8 = data.write();
		float *wd = (float *)wd8.ptr();
		PoolVector<bool>::Write wu = used.write();
		int pc = p_points.size();
		PoolVector<Vector2>::Read pr = p_points.read();

		for (int i = 0; i < width; i++) {
			wd[i] = 0.0;
			wu[i] = false;
		}

		Vector2 prev = Vector2(0, 0);
		Vector2 prev2 = Vector2(0, 0);

		for (int i = -1; i < pc; i++) {

			Vector2 next;
			Vector2 next2;
			if (i + 1 >= pc) {
				next = Vector2(1, 0);
			} else {
				next = Vector2(pr[i + 1].x, pr[i + 1].y);
			}

			if (i + 2 >= pc) {
				next2 = Vector2(1, 0);
			} else {
				next2 = Vector2(pr[i + 2].x, pr[i + 2].y);
			}

			/*if (i==-1 && prev.offset==next.offset) {
				prev=next;
				continue;
			}*/

			_plot_curve(prev2, prev, next, next2, wd, wu.ptr(), width, min, max);

			prev2 = prev;
			prev = next;
		}
	}

	Image image(width, 1, false, Image::FORMAT_RF, data);

	VS::get_singleton()->texture_allocate(texture, width, 1, Image::FORMAT_RF, VS::TEXTURE_FLAG_FILTER);
	VS::get_singleton()->texture_set_data(texture, image);

	emit_changed();
}

PoolVector<Vector2> CurveTexture::get_points() const {

	return points;
}

RID CurveTexture::get_rid() const {

	return texture;
}

CurveTexture::CurveTexture() {

	max = 1;
	min = 0;
	width = 2048;
	texture = VS::get_singleton()->texture_create();
}
CurveTexture::~CurveTexture() {
	VS::get_singleton()->free(texture);
}
//////////////////

//setter and getter names for property serialization
#define COLOR_RAMP_GET_OFFSETS "get_offsets"
#define COLOR_RAMP_GET_COLORS "get_colors"
#define COLOR_RAMP_SET_OFFSETS "set_offsets"
#define COLOR_RAMP_SET_COLORS "set_colors"

GradientTexture::GradientTexture() {
	//Set initial color ramp transition from black to white
	points.resize(2);
	points[0].color = Color(0, 0, 0, 1);
	points[0].offset = 0;
	points[1].color = Color(1, 1, 1, 1);
	points[1].offset = 1;
	is_sorted = true;
	update_pending = false;
	width = 2048;

	texture = VS::get_singleton()->texture_create();
	_queue_update();
}

GradientTexture::~GradientTexture() {
	VS::get_singleton()->free(texture);
}

void GradientTexture::_bind_methods() {

	ClassDB::bind_method(D_METHOD("add_point", "offset", "color"), &GradientTexture::add_point);
	ClassDB::bind_method(D_METHOD("remove_point", "offset", "color"), &GradientTexture::remove_point);

	ClassDB::bind_method(D_METHOD("set_offset", "point", "offset"), &GradientTexture::set_offset);
	ClassDB::bind_method(D_METHOD("get_offset", "point"), &GradientTexture::get_offset);

	ClassDB::bind_method(D_METHOD("set_color", "point", "color"), &GradientTexture::set_color);
	ClassDB::bind_method(D_METHOD("get_color", "point"), &GradientTexture::get_color);

	ClassDB::bind_method(D_METHOD("set_width", "width"), &GradientTexture::set_width);

	ClassDB::bind_method(D_METHOD("interpolate", "offset"), &GradientTexture::get_color_at_offset);

	ClassDB::bind_method(D_METHOD("get_point_count"), &GradientTexture::get_points_count);

	ClassDB::bind_method(D_METHOD("_update"), &GradientTexture::_update);

	ClassDB::bind_method(D_METHOD(COLOR_RAMP_SET_OFFSETS, "offsets"), &GradientTexture::set_offsets);
	ClassDB::bind_method(D_METHOD(COLOR_RAMP_GET_OFFSETS), &GradientTexture::get_offsets);

	ClassDB::bind_method(D_METHOD(COLOR_RAMP_SET_COLORS, "colors"), &GradientTexture::set_colors);
	ClassDB::bind_method(D_METHOD(COLOR_RAMP_GET_COLORS), &GradientTexture::get_colors);

	ADD_PROPERTY(PropertyInfo(Variant::INT, "width"), "set_width", "get_width");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "offsets"), COLOR_RAMP_SET_OFFSETS, COLOR_RAMP_GET_OFFSETS);
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "colors"), COLOR_RAMP_SET_COLORS, COLOR_RAMP_GET_COLORS);
}

void GradientTexture::_queue_update() {

	if (update_pending)
		return;

	call_deferred("_update");
}

void GradientTexture::_update() {

	update_pending = false;

	PoolVector<uint8_t> data;
	data.resize(width * 4);
	{
		PoolVector<uint8_t>::Write wd8 = data.write();
		for (int i = 0; i < width; i++) {
			float ofs = float(i) / (width - 1);

			Color color = get_color_at_offset(ofs);
			wd8[i * 4 + 0] = uint8_t(CLAMP(color.r * 255.0, 0, 255));
			wd8[i * 4 + 1] = uint8_t(CLAMP(color.g * 255.0, 0, 255));
			wd8[i * 4 + 2] = uint8_t(CLAMP(color.b * 255.0, 0, 255));
			wd8[i * 4 + 3] = uint8_t(CLAMP(color.a * 255.0, 0, 255));
		}
	}

	Image image(width, 1, false, Image::FORMAT_RGBA8, data);

	VS::get_singleton()->texture_allocate(texture, width, 1, Image::FORMAT_RGBA8, VS::TEXTURE_FLAG_FILTER);
	VS::get_singleton()->texture_set_data(texture, image);

	emit_changed();
}

void GradientTexture::set_width(int p_width) {

	width = p_width;
	_queue_update();
}
int GradientTexture::get_width() const {

	return width;
}

Vector<float> GradientTexture::get_offsets() const {
	Vector<float> offsets;
	offsets.resize(points.size());
	for (int i = 0; i < points.size(); i++) {
		offsets[i] = points[i].offset;
	}
	return offsets;
}

Vector<Color> GradientTexture::get_colors() const {
	Vector<Color> colors;
	colors.resize(points.size());
	for (int i = 0; i < points.size(); i++) {
		colors[i] = points[i].color;
	}
	return colors;
}

void GradientTexture::set_offsets(const Vector<float> &p_offsets) {
	points.resize(p_offsets.size());
	for (int i = 0; i < points.size(); i++) {
		points[i].offset = p_offsets[i];
	}
	is_sorted = false;
	emit_changed();
	_queue_update();
}

void GradientTexture::set_colors(const Vector<Color> &p_colors) {
	if (points.size() < p_colors.size())
		is_sorted = false;
	points.resize(p_colors.size());
	for (int i = 0; i < points.size(); i++) {
		points[i].color = p_colors[i];
	}
	emit_changed();
	_queue_update();
}

Vector<GradientTexture::Point> &GradientTexture::get_points() {
	return points;
}

void GradientTexture::add_point(float p_offset, const Color &p_color) {

	Point p;
	p.offset = p_offset;
	p.color = p_color;
	is_sorted = false;
	points.push_back(p);

	emit_changed();
	_queue_update();
}

void GradientTexture::remove_point(int p_index) {

	ERR_FAIL_INDEX(p_index, points.size());
	ERR_FAIL_COND(points.size() <= 2);
	points.remove(p_index);
	emit_changed();
	_queue_update();
}

void GradientTexture::set_points(Vector<GradientTexture::Point> &p_points) {
	points = p_points;
	is_sorted = false;
	emit_changed();
	_queue_update();
}

void GradientTexture::set_offset(int pos, const float offset) {
	if (points.size() <= pos)
		points.resize(pos + 1);
	points[pos].offset = offset;
	is_sorted = false;
	emit_changed();
	_queue_update();
}

float GradientTexture::get_offset(int pos) const {
	if (points.size() > pos)
		return points[pos].offset;
	return 0; //TODO: Maybe throw some error instead?
}

void GradientTexture::set_color(int pos, const Color &color) {
	if (points.size() <= pos) {
		points.resize(pos + 1);
		is_sorted = false;
	}
	points[pos].color = color;
	emit_changed();
	_queue_update();
}

Color GradientTexture::get_color(int pos) const {
	if (points.size() > pos)
		return points[pos].color;
	return Color(0, 0, 0, 1); //TODO: Maybe throw some error instead?
}

int GradientTexture::get_points_count() const {
	return points.size();
}