/*************************************************************************/
/*  particles_2d.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 "particles_2d.h"
#include "scene/scene_string_names.h"

void ParticleAttractor2D::_notification(int p_what) {

	switch (p_what) {

		case NOTIFICATION_ENTER_TREE: {

			_update_owner();

		} break;
		case NOTIFICATION_DRAW: {

			if (!get_tree()->is_editor_hint())
				return;

			Vector2 pv;
			float dr = MIN(disable_radius, radius);
			for (int i = 0; i <= 32; i++) {
				Vector2 v(Math::sin(i / 32.0 * Math_PI * 2), Math::cos(i / 32.0 * Math_PI * 2));
				if (i > 0) {
					draw_line(pv * radius, v * radius, Color(0, 0, 0.5, 0.9));
					if (dr > 0) {
						draw_line(pv * dr, v * dr, Color(0.5, 0, 0.0, 0.9));
					}
				}
				pv = v;
			}

		} break;
		case NOTIFICATION_EXIT_TREE: {
			if (owner) {
				_set_owner(NULL);
			}

		} break;
	}
}

void ParticleAttractor2D::_owner_exited() {

	ERR_FAIL_COND(!owner);
	owner->attractors.erase(this);
	owner = NULL;
}

void ParticleAttractor2D::_update_owner() {

	if (!is_inside_tree() || !has_node(path)) {
		_set_owner(NULL);
		return;
	}

	Node *n = get_node(path);
	ERR_FAIL_COND(!n);
	Particles2D *pn = n->cast_to<Particles2D>();
	if (!pn) {
		_set_owner(NULL);
		return;
	}

	_set_owner(pn);
}

void ParticleAttractor2D::_set_owner(Particles2D *p_owner) {

	if (owner == p_owner)
		return;

	if (owner) {
		owner->disconnect("tree_exited", this, "_owner_exited");
		owner->attractors.erase(this);
		owner = NULL;
	}
	owner = p_owner;

	if (owner) {

		owner->connect("tree_exited", this, "_owner_exited", varray(), CONNECT_ONESHOT);
		owner->attractors.insert(this);
	}
}

void ParticleAttractor2D::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_enabled", "enabled"), &ParticleAttractor2D::set_enabled);
	ClassDB::bind_method(D_METHOD("is_enabled"), &ParticleAttractor2D::is_enabled);

	ClassDB::bind_method(D_METHOD("set_radius", "radius"), &ParticleAttractor2D::set_radius);
	ClassDB::bind_method(D_METHOD("get_radius"), &ParticleAttractor2D::get_radius);

	ClassDB::bind_method(D_METHOD("set_disable_radius", "radius"), &ParticleAttractor2D::set_disable_radius);
	ClassDB::bind_method(D_METHOD("get_disable_radius"), &ParticleAttractor2D::get_disable_radius);

	ClassDB::bind_method(D_METHOD("set_gravity", "gravity"), &ParticleAttractor2D::set_gravity);
	ClassDB::bind_method(D_METHOD("get_gravity"), &ParticleAttractor2D::get_gravity);

	ClassDB::bind_method(D_METHOD("set_absorption", "absorption"), &ParticleAttractor2D::set_absorption);
	ClassDB::bind_method(D_METHOD("get_absorption"), &ParticleAttractor2D::get_absorption);

	ClassDB::bind_method(D_METHOD("set_particles_path", "path"), &ParticleAttractor2D::set_particles_path);
	ClassDB::bind_method(D_METHOD("get_particles_path"), &ParticleAttractor2D::get_particles_path);

	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "enabled"), "set_enabled", "is_enabled");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "radius", PROPERTY_HINT_RANGE, "0.1,16000,0.1"), "set_radius", "get_radius");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "disable_radius", PROPERTY_HINT_RANGE, "0.1,16000,0.1"), "set_disable_radius", "get_disable_radius");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "gravity", PROPERTY_HINT_RANGE, "-512,512,0.01"), "set_gravity", "get_gravity");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "absorption", PROPERTY_HINT_RANGE, "0,512,0.01"), "set_absorption", "get_absorption");
	ADD_PROPERTY(PropertyInfo(Variant::NODE_PATH, "particles_path", PROPERTY_HINT_RESOURCE_TYPE, "Particles2D"), "set_particles_path", "get_particles_path");
}

void ParticleAttractor2D::set_enabled(bool p_enabled) {

	enabled = p_enabled;
}

bool ParticleAttractor2D::is_enabled() const {

	return enabled;
}

void ParticleAttractor2D::set_radius(float p_radius) {

	radius = p_radius;
	update();
}

float ParticleAttractor2D::get_radius() const {

	return radius;
}

void ParticleAttractor2D::set_disable_radius(float p_disable_radius) {

	disable_radius = p_disable_radius;
	update();
}
float ParticleAttractor2D::get_disable_radius() const {

	return disable_radius;
}

void ParticleAttractor2D::set_gravity(float p_gravity) {

	gravity = p_gravity;
}
float ParticleAttractor2D::get_gravity() const {

	return gravity;
}

void ParticleAttractor2D::set_absorption(float p_absorption) {

	absorption = p_absorption;
}
float ParticleAttractor2D::get_absorption() const {

	return absorption;
}

void ParticleAttractor2D::set_particles_path(NodePath p_path) {

	path = p_path;
	_update_owner();
	update_configuration_warning();
}
NodePath ParticleAttractor2D::get_particles_path() const {

	return path;
}

String ParticleAttractor2D::get_configuration_warning() const {

	if (!has_node(path) || !get_node(path) || !get_node(path)->cast_to<Particles2D>()) {
		return TTR("Path property must point to a valid Particles2D node to work.");
	}

	return String();
}

ParticleAttractor2D::ParticleAttractor2D() {

	owner = NULL;
	radius = 50;
	disable_radius = 0;
	gravity = 100;
	absorption = 0;
	path = String("..");
	enabled = true;
}

/****************************************/

_FORCE_INLINE_ static float _rand_from_seed(uint64_t *seed) {

	uint32_t r = Math::rand_from_seed(seed);
	return 2.0f * (float)r / (float)Math::RANDOM_MAX - 1.0f;
}

void Particles2D::_process_particles(float p_delta) {

	if (particles.size() == 0 || lifetime == 0)
		return;

	p_delta *= time_scale;

	float frame_time = p_delta;

	if (emit_timeout > 0) {
		time_to_live -= frame_time;
		if (time_to_live < 0) {

			emitting = false;
			_change_notify("config/emitting");
		};
	};

	float next_time = time + frame_time;

	if (next_time > lifetime)
		next_time = Math::fmod(next_time, lifetime);

	Particle *pdata = &particles[0];
	int particle_count = particles.size();
	Transform2D xform;
	if (!local_space)
		xform = get_global_transform();

	active_count = 0;

	PoolVector<Point2>::Read r;
	int emission_point_count = 0;
	if (emission_points.size()) {

		emission_point_count = emission_points.size();
		r = emission_points.read();
	}

	int attractor_count = 0;
	AttractorCache *attractor_ptr = NULL;

	if (attractors.size()) {
		if (attractors.size() != attractor_cache.size()) {
			attractor_cache.resize(attractors.size());
		}

		int idx = 0;
		Transform2D m;
		if (local_space) {
			m = get_global_transform().affine_inverse();
		}
		for (Set<ParticleAttractor2D *>::Element *E = attractors.front(); E; E = E->next()) {

			attractor_cache[idx].pos = m.xform(E->get()->get_global_position());
			attractor_cache[idx].attractor = E->get();
			idx++;
		}

		attractor_ptr = attractor_cache.ptr();
		attractor_count = attractor_cache.size();
	}

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

		Particle &p = pdata[i];

		float restart_time = (i * lifetime / particle_count) * explosiveness;

		bool restart = false;

		if (next_time < time) {

			if (restart_time > time || restart_time < next_time)
				restart = true;

		} else if (restart_time > time && restart_time < next_time) {
			restart = true;
		}

		if (restart) {

			if (emitting) {

				p.pos = emissor_offset;
				if (emission_point_count) {

					Vector2 ep = r[Math::rand() % emission_point_count];
					if (!local_space) {
						p.pos = xform.xform(p.pos + ep * extents);
					} else {
						p.pos += ep * extents;
					}
				} else {
					if (!local_space) {
						p.pos = xform.xform(p.pos + Vector2(Math::random(-extents.x, extents.x), Math::random(-extents.y, extents.y)));
					} else {
						p.pos += Vector2(Math::random(-extents.x, extents.x), Math::random(-extents.y, extents.y));
					}
				}
				p.seed = Math::rand() % 12345678;
				uint64_t rand_seed = p.seed * (i + 1);

				float angle = Math::deg2rad(param[PARAM_DIRECTION] + _rand_from_seed(&rand_seed) * param[PARAM_SPREAD]);

				p.velocity = Vector2(Math::sin(angle), Math::cos(angle));
				if (!local_space) {

					p.velocity = xform.basis_xform(p.velocity).normalized();
				}

				p.velocity *= param[PARAM_LINEAR_VELOCITY] + param[PARAM_LINEAR_VELOCITY] * _rand_from_seed(&rand_seed) * randomness[PARAM_LINEAR_VELOCITY];
				p.velocity += initial_velocity;
				p.active = true;
				p.rot = Math::deg2rad(param[PARAM_INITIAL_ANGLE] + param[PARAM_INITIAL_ANGLE] * randomness[PARAM_INITIAL_ANGLE] * _rand_from_seed(&rand_seed));
				active_count++;

				p.frame = Math::fmod(param[PARAM_ANIM_INITIAL_POS] + randomness[PARAM_ANIM_INITIAL_POS] * _rand_from_seed(&rand_seed), 1.0f);

			} else {

				p.active = false;
			}

		} else {

			if (!p.active)
				continue;

			uint64_t rand_seed = p.seed * (i + 1);

			Vector2 force;

			//apply gravity
			float gravity_dir = Math::deg2rad(param[PARAM_GRAVITY_DIRECTION] + 180 * randomness[PARAM_GRAVITY_DIRECTION] * _rand_from_seed(&rand_seed));
			force += Vector2(Math::sin(gravity_dir), Math::cos(gravity_dir)) * (param[PARAM_GRAVITY_STRENGTH] + param[PARAM_GRAVITY_STRENGTH] * randomness[PARAM_GRAVITY_STRENGTH] * _rand_from_seed(&rand_seed));
			//apply radial
			Vector2 rvec = (p.pos - emissor_offset).normalized();
			force += rvec * (param[PARAM_RADIAL_ACCEL] + param[PARAM_RADIAL_ACCEL] * randomness[PARAM_RADIAL_ACCEL] * _rand_from_seed(&rand_seed));
			//apply orbit
			float orbitvel = (param[PARAM_ORBIT_VELOCITY] + param[PARAM_ORBIT_VELOCITY] * randomness[PARAM_ORBIT_VELOCITY] * _rand_from_seed(&rand_seed));
			if (orbitvel != 0) {
				Vector2 rel = p.pos - xform.elements[2];
				Transform2D rot(orbitvel * frame_time, Vector2());
				p.pos = rot.xform(rel) + xform.elements[2];
			}

			Vector2 tvec = rvec.tangent();
			force += tvec * (param[PARAM_TANGENTIAL_ACCEL] + param[PARAM_TANGENTIAL_ACCEL] * randomness[PARAM_TANGENTIAL_ACCEL] * _rand_from_seed(&rand_seed));

			for (int j = 0; j < attractor_count; j++) {

				Vector2 vec = (attractor_ptr[j].pos - p.pos);
				float vl = vec.length();

				if (!attractor_ptr[j].attractor->enabled || vl == 0 || vl > attractor_ptr[j].attractor->radius)
					continue;

				force += vec * attractor_ptr[j].attractor->gravity;
				float fvl = p.velocity.length();
				if (fvl && attractor_ptr[j].attractor->absorption) {
					Vector2 target = vec.normalized();
					p.velocity = p.velocity.normalized().linear_interpolate(target, MIN(frame_time * attractor_ptr[j].attractor->absorption, 1)) * fvl;
				}

				if (attractor_ptr[j].attractor->disable_radius && vl < attractor_ptr[j].attractor->disable_radius) {
					p.active = false;
				}
			}

			p.velocity += force * frame_time;

			if (param[PARAM_DAMPING]) {
				float dmp = param[PARAM_DAMPING] + param[PARAM_DAMPING] * randomness[PARAM_DAMPING] * _rand_from_seed(&rand_seed);
				float v = p.velocity.length();
				v -= dmp * frame_time;
				if (v <= 0) {
					p.velocity = Vector2();
				} else {
					p.velocity = p.velocity.normalized() * v;
				}
			}

			p.pos += p.velocity * frame_time;
			p.rot += Math::lerp(param[PARAM_SPIN_VELOCITY], param[PARAM_SPIN_VELOCITY] * randomness[PARAM_SPIN_VELOCITY] * _rand_from_seed(&rand_seed), randomness[PARAM_SPIN_VELOCITY]) * frame_time;
			float anim_spd = param[PARAM_ANIM_SPEED_SCALE] + param[PARAM_ANIM_SPEED_SCALE] * randomness[PARAM_ANIM_SPEED_SCALE] * _rand_from_seed(&rand_seed);
			p.frame = Math::fposmod(p.frame + (frame_time / lifetime) * anim_spd, 1.0f);

			active_count++;
		}
	}

	time = Math::fmod(time + frame_time, lifetime);
	if (!emitting && active_count == 0) {
		emit_signal(SceneStringNames::get_singleton()->emission_finished);
		set_process(false);
		set_fixed_process(false);
	}

	update();
}

void Particles2D::_notification(int p_what) {

	switch (p_what) {

		case NOTIFICATION_PROCESS: {

			_process_particles(get_process_delta_time());
		} break;

		case NOTIFICATION_FIXED_PROCESS: {

			_process_particles(get_fixed_process_delta_time());
		} break;

		case NOTIFICATION_ENTER_TREE: {

			float ppt = preprocess;
			while (ppt > 0) {
				_process_particles(0.1);
				ppt -= 0.1;
			}
		} break;
		case NOTIFICATION_DRAW: {

			if (particles.size() == 0 || lifetime == 0)
				return;

			RID ci = get_canvas_item();
			Size2 size(1, 1);
			Point2 center;
			int total_frames = 1;

			if (!texture.is_null()) {
				size = texture->get_size();
				size.x /= h_frames;
				size.y /= v_frames;
				total_frames = h_frames * v_frames;
			}

			float time_pos = (time / lifetime);

			Particle *pdata = &particles[0];
			int particle_count = particles.size();

			RID texrid;

			if (texture.is_valid())
				texrid = texture->get_rid();

			Transform2D invxform;
			if (!local_space)
				invxform = get_global_transform().affine_inverse();

			int start_particle = (int)(time * (float)particle_count / lifetime);

			for (int id = 0; id < particle_count; ++id) {
				int i = start_particle + id;
				if (i >= particle_count) {
					i -= particle_count;
				}

				Particle &p = pdata[i];
				if (!p.active)
					continue;

				float ptime = ((float)i / particle_count) * explosiveness;

				if (ptime < time_pos)
					ptime = time_pos - ptime;
				else
					ptime = (1.0 - ptime) + time_pos;

				uint64_t rand_seed = p.seed * (i + 1);

				Color color;

				if (color_ramp.is_valid()) {
					color = color_ramp->get_color_at_offset(ptime);
				} else {
					color = default_color;
				}

				{
					float huerand = _rand_from_seed(&rand_seed);
					float huerot = param[PARAM_HUE_VARIATION] + randomness[PARAM_HUE_VARIATION] * huerand;

					if (Math::abs(huerot) > CMP_EPSILON) {

						float h = color.get_h();
						float s = color.get_s();
						float v = color.get_v();
						float a = color.a;
						//float preh=h;
						h += huerot;
						h = Math::abs(Math::fposmod(h, 1.0f));
						//print_line("rand: "+rtos(randomness[PARAM_HUE_VARIATION])+" rand: "+rtos(huerand));
						//print_line(itos(i)+":hue: "+rtos(preh)+" + "+rtos(huerot)+" = "+rtos(h));
						color.set_hsv(h, s, v);
						color.a = a;
					}
				}

				float initial_size = param[PARAM_INITIAL_SIZE] + param[PARAM_INITIAL_SIZE] * _rand_from_seed(&rand_seed) * randomness[PARAM_INITIAL_SIZE];
				float final_size = param[PARAM_FINAL_SIZE] + param[PARAM_FINAL_SIZE] * _rand_from_seed(&rand_seed) * randomness[PARAM_FINAL_SIZE];

				float size_mult = initial_size * (1.0 - ptime) + final_size * ptime;

				//Size2 rectsize=size * size_mult;
				//rectsize=rectsize.floor();

				//Rect2 r = Rect2(Vecto,rectsize);

				Transform2D xform;

				if (p.rot) {

					xform.set_rotation(p.rot);
					xform.translate(-size * size_mult / 2.0);
					xform.elements[2] += p.pos;
				} else {
					xform.elements[2] = -size * size_mult / 2.0;
					xform.elements[2] += p.pos;
				}

				if (!local_space) {
					xform = invxform * xform;
				}

				xform.scale_basis(Size2(size_mult, size_mult));

				VisualServer::get_singleton()->canvas_item_add_set_transform(ci, xform);

				if (texrid.is_valid()) {

					Rect2 src_rect;
					src_rect.size = size;

					if (total_frames > 1) {
						int frame = Math::fast_ftoi(Math::floor(p.frame * total_frames)) % total_frames;
						src_rect.position.x = size.x * (frame % h_frames);
						src_rect.position.y = size.y * (frame / h_frames);
					}
					Rect2 dst_rect(Point2(), size);
					if (flip_h)
						dst_rect.size.x = -dst_rect.size.x;
					if (flip_v)
						dst_rect.size.y = -dst_rect.size.y;

					texture->draw_rect_region(ci, dst_rect, src_rect, color);
					//VisualServer::get_singleton()->canvas_item_add_texture_rect(ci,r,texrid,false,color);
				} else {
					VisualServer::get_singleton()->canvas_item_add_rect(ci, Rect2(Point2(), size), color);
				}
			}

		} break;
	}
}

static const char *_particlesframe_property_names[Particles2D::PARAM_MAX] = {
	"params/direction",
	"params/spread",
	"params/linear_velocity",
	"params/spin_velocity",
	"params/orbit_velocity",
	"params/gravity_direction",
	"params/gravity_strength",
	"params/radial_accel",
	"params/tangential_accel",
	"params/damping",
	"params/initial_angle",
	"params/initial_size",
	"params/final_size",
	"params/hue_variation",
	"params/anim_speed_scale",
	"params/anim_initial_pos",
};

static const char *_particlesframe_property_rnames[Particles2D::PARAM_MAX] = {
	"randomness/direction",
	"randomness/spread",
	"randomness/linear_velocity",
	"randomness/spin_velocity",
	"randomness/orbit_velocity",
	"randomness/gravity_direction",
	"randomness/gravity_strength",
	"randomness/radial_accel",
	"randomness/tangential_accel",
	"randomness/damping",
	"randomness/initial_angle",
	"randomness/initial_size",
	"randomness/final_size",
	"randomness/hue_variation",
	"randomness/anim_speed_scale",
	"randomness/anim_initial_pos",
};

static const char *_particlesframe_property_ranges[Particles2D::PARAM_MAX] = {
	"0,360,0.01",
	"0,180,0.01",
	"-1024,1024,0.01",
	"-1024,1024,0.01",
	"-1024,1024,0.01",
	"0,360,0.01",
	"0,1024,0.01",
	"-128,128,0.01",
	"-128,128,0.01",
	"0,1024,0.001",
	"0,360,0.01",
	"0,1024,0.01",
	"0,1024,0.01",
	"0,1,0.01",
	"0,128,0.01",
	"0,1,0.01",
};

void Particles2D::set_emitting(bool p_emitting) {

	if (emitting == p_emitting)
		return;

	if (p_emitting) {

		if (active_count == 0)
			time = 0;
		set_process(process_mode == PROCESS_IDLE);
		set_fixed_process(process_mode == PROCESS_FIXED);
		time_to_live = emit_timeout;
	};
	emitting = p_emitting;
	_change_notify("config/emitting");
}

bool Particles2D::is_emitting() const {

	return emitting;
}

void Particles2D::set_process_mode(ProcessMode p_mode) {

	process_mode = p_mode;
	const bool should_process = emitting || active_count != 0;
	set_process(should_process && process_mode == PROCESS_IDLE);
	set_fixed_process(should_process && process_mode == PROCESS_FIXED);
}

Particles2D::ProcessMode Particles2D::get_process_mode() const {

	return process_mode;
}

void Particles2D::set_amount(int p_amount) {

	ERR_FAIL_INDEX(p_amount, 1024 + 1);

	particles.resize(p_amount);
}
int Particles2D::get_amount() const {

	return particles.size();
}

void Particles2D::set_emit_timeout(float p_timeout) {

	emit_timeout = p_timeout;
	time_to_live = p_timeout;
};

float Particles2D::get_emit_timeout() const {

	return emit_timeout;
};

void Particles2D::set_lifetime(float p_lifetime) {

	ERR_FAIL_INDEX(p_lifetime, 3600 + 1);

	lifetime = p_lifetime;
}
float Particles2D::get_lifetime() const {

	return lifetime;
}

void Particles2D::set_time_scale(float p_time_scale) {

	time_scale = p_time_scale;
}
float Particles2D::get_time_scale() const {

	return time_scale;
}

void Particles2D::set_pre_process_time(float p_pre_process_time) {

	preprocess = p_pre_process_time;
}

float Particles2D::get_pre_process_time() const {

	return preprocess;
}

void Particles2D::set_param(Parameter p_param, float p_value) {

	ERR_FAIL_INDEX(p_param, PARAM_MAX);
	param[p_param] = p_value;
}
float Particles2D::get_param(Parameter p_param) const {

	ERR_FAIL_INDEX_V(p_param, PARAM_MAX, 0);
	return param[p_param];
}

void Particles2D::set_randomness(Parameter p_param, float p_value) {

	ERR_FAIL_INDEX(p_param, PARAM_MAX);
	randomness[p_param] = p_value;
}
float Particles2D::get_randomness(Parameter p_param) const {

	ERR_FAIL_INDEX_V(p_param, PARAM_MAX, 0);
	return randomness[p_param];
}

void Particles2D::set_texture(const Ref<Texture> &p_texture) {

	texture = p_texture;
}

Ref<Texture> Particles2D::get_texture() const {

	return texture;
}

void Particles2D::set_color(const Color &p_color) {

	default_color = p_color;
}

Color Particles2D::get_color() const {

	return default_color;
}

void Particles2D::set_color_ramp(const Ref<Gradient> &p_color_ramp) {

	color_ramp = p_color_ramp;
}

Ref<Gradient> Particles2D::get_color_ramp() const {

	return color_ramp;
}

void Particles2D::set_emissor_offset(const Point2 &p_offset) {

	emissor_offset = p_offset;
}

Point2 Particles2D::get_emissor_offset() const {

	return emissor_offset;
}

void Particles2D::set_use_local_space(bool p_use) {

	local_space = p_use;
}

bool Particles2D::is_using_local_space() const {

	return local_space;
}

//Deprecated. Converts color phases to color ramp
void Particles2D::set_color_phases(int p_phases) {

	//Create color ramp if we have 2 or more phases.
	//Otherwise first phase phase will be assigned to default color.
	if (p_phases > 1 && color_ramp.is_null()) {
		color_ramp = Ref<Gradient>(memnew(Gradient()));
	}
	if (color_ramp.is_valid()) {
		color_ramp->get_points().resize(p_phases);
	}
}

//Deprecated.
int Particles2D::get_color_phases() const {

	if (color_ramp.is_valid()) {
		return color_ramp->get_points_count();
	}
	return 0;
}

//Deprecated. Converts color phases to color ramp
void Particles2D::set_color_phase_color(int p_phase, const Color &p_color) {

	ERR_FAIL_INDEX(p_phase, MAX_COLOR_PHASES);
	if (color_ramp.is_valid()) {
		if (color_ramp->get_points_count() > p_phase)
			color_ramp->set_color(p_phase, p_color);
	} else {
		if (p_phase == 0)
			default_color = p_color;
	}
}

//Deprecated.
Color Particles2D::get_color_phase_color(int p_phase) const {

	ERR_FAIL_INDEX_V(p_phase, MAX_COLOR_PHASES, Color());
	if (color_ramp.is_valid()) {
		return color_ramp->get_color(p_phase);
	}
	return Color(0, 0, 0, 1);
}

//Deprecated. Converts color phases to color ramp
void Particles2D::set_color_phase_pos(int p_phase, float p_pos) {
	ERR_FAIL_INDEX(p_phase, MAX_COLOR_PHASES);
	ERR_FAIL_COND(p_pos < 0.0 || p_pos > 1.0);
	if (color_ramp.is_valid() && color_ramp->get_points_count() > p_phase) {
		return color_ramp->set_offset(p_phase, p_pos);
	}
}

//Deprecated.
float Particles2D::get_color_phase_pos(int p_phase) const {

	ERR_FAIL_INDEX_V(p_phase, MAX_COLOR_PHASES, 0);
	if (color_ramp.is_valid()) {
		return color_ramp->get_offset(p_phase);
	}
	return 0;
}

void Particles2D::set_emission_half_extents(const Vector2 &p_extents) {

	extents = p_extents;
}

Vector2 Particles2D::get_emission_half_extents() const {

	return extents;
}

void Particles2D::set_initial_velocity(const Vector2 &p_velocity) {

	initial_velocity = p_velocity;
}
Vector2 Particles2D::get_initial_velocity() const {

	return initial_velocity;
}

void Particles2D::pre_process(float p_delta) {

	_process_particles(p_delta);
}

void Particles2D::set_explosiveness(float p_value) {

	explosiveness = p_value;
}

float Particles2D::get_explosiveness() const {

	return explosiveness;
}

void Particles2D::set_flip_h(bool p_flip) {

	flip_h = p_flip;
}

bool Particles2D::is_flipped_h() const {

	return flip_h;
}

void Particles2D::set_flip_v(bool p_flip) {

	flip_v = p_flip;
}
bool Particles2D::is_flipped_v() const {

	return flip_v;
}

void Particles2D::set_h_frames(int p_frames) {

	ERR_FAIL_COND(p_frames < 1);
	h_frames = p_frames;
}

int Particles2D::get_h_frames() const {

	return h_frames;
}

void Particles2D::set_v_frames(int p_frames) {

	ERR_FAIL_COND(p_frames < 1);
	v_frames = p_frames;
}
int Particles2D::get_v_frames() const {

	return v_frames;
}

void Particles2D::set_emission_points(const PoolVector<Vector2> &p_points) {

	emission_points = p_points;
}

PoolVector<Vector2> Particles2D::get_emission_points() const {

	return emission_points;
}

void Particles2D::reset() {

	for (int i = 0; i < particles.size(); i++) {
		particles[i].active = false;
	}
	time = 0;
	active_count = 0;
}

void Particles2D::_bind_methods() {

	ClassDB::bind_method(D_METHOD("set_emitting", "active"), &Particles2D::set_emitting);
	ClassDB::bind_method(D_METHOD("is_emitting"), &Particles2D::is_emitting);

	ClassDB::bind_method(D_METHOD("set_process_mode", "mode"), &Particles2D::set_process_mode);
	ClassDB::bind_method(D_METHOD("get_process_mode"), &Particles2D::get_process_mode);

	ClassDB::bind_method(D_METHOD("set_amount", "amount"), &Particles2D::set_amount);
	ClassDB::bind_method(D_METHOD("get_amount"), &Particles2D::get_amount);

	ClassDB::bind_method(D_METHOD("set_lifetime", "lifetime"), &Particles2D::set_lifetime);
	ClassDB::bind_method(D_METHOD("get_lifetime"), &Particles2D::get_lifetime);

	ClassDB::bind_method(D_METHOD("set_time_scale", "time_scale"), &Particles2D::set_time_scale);
	ClassDB::bind_method(D_METHOD("get_time_scale"), &Particles2D::get_time_scale);

	ClassDB::bind_method(D_METHOD("set_pre_process_time", "time"), &Particles2D::set_pre_process_time);
	ClassDB::bind_method(D_METHOD("get_pre_process_time"), &Particles2D::get_pre_process_time);

	ClassDB::bind_method(D_METHOD("set_emit_timeout", "value"), &Particles2D::set_emit_timeout);
	ClassDB::bind_method(D_METHOD("get_emit_timeout"), &Particles2D::get_emit_timeout);

	ClassDB::bind_method(D_METHOD("set_param", "param", "value"), &Particles2D::set_param);
	ClassDB::bind_method(D_METHOD("get_param", "param"), &Particles2D::get_param);

	ClassDB::bind_method(D_METHOD("set_randomness", "param", "value"), &Particles2D::set_randomness);
	ClassDB::bind_method(D_METHOD("get_randomness", "param"), &Particles2D::get_randomness);

	ClassDB::bind_method(D_METHOD("set_texture:Texture", "texture"), &Particles2D::set_texture);
	ClassDB::bind_method(D_METHOD("get_texture:Texture"), &Particles2D::get_texture);

	ClassDB::bind_method(D_METHOD("set_color", "color"), &Particles2D::set_color);
	ClassDB::bind_method(D_METHOD("get_color"), &Particles2D::get_color);

	ClassDB::bind_method(D_METHOD("set_color_ramp:ColorRamp", "color_ramp"), &Particles2D::set_color_ramp);
	ClassDB::bind_method(D_METHOD("get_color_ramp:ColorRamp"), &Particles2D::get_color_ramp);

	ClassDB::bind_method(D_METHOD("set_emissor_offset", "offset"), &Particles2D::set_emissor_offset);
	ClassDB::bind_method(D_METHOD("get_emissor_offset"), &Particles2D::get_emissor_offset);

	ClassDB::bind_method(D_METHOD("set_flip_h", "enable"), &Particles2D::set_flip_h);
	ClassDB::bind_method(D_METHOD("is_flipped_h"), &Particles2D::is_flipped_h);

	ClassDB::bind_method(D_METHOD("set_flip_v", "enable"), &Particles2D::set_flip_v);
	ClassDB::bind_method(D_METHOD("is_flipped_v"), &Particles2D::is_flipped_v);

	ClassDB::bind_method(D_METHOD("set_h_frames", "enable"), &Particles2D::set_h_frames);
	ClassDB::bind_method(D_METHOD("get_h_frames"), &Particles2D::get_h_frames);

	ClassDB::bind_method(D_METHOD("set_v_frames", "enable"), &Particles2D::set_v_frames);
	ClassDB::bind_method(D_METHOD("get_v_frames"), &Particles2D::get_v_frames);

	ClassDB::bind_method(D_METHOD("set_emission_half_extents", "extents"), &Particles2D::set_emission_half_extents);
	ClassDB::bind_method(D_METHOD("get_emission_half_extents"), &Particles2D::get_emission_half_extents);

	ClassDB::bind_method(D_METHOD("set_color_phases", "phases"), &Particles2D::set_color_phases);
	ClassDB::bind_method(D_METHOD("get_color_phases"), &Particles2D::get_color_phases);

	ClassDB::bind_method(D_METHOD("set_color_phase_color", "phase", "color"), &Particles2D::set_color_phase_color);
	ClassDB::bind_method(D_METHOD("get_color_phase_color", "phase"), &Particles2D::get_color_phase_color);

	ClassDB::bind_method(D_METHOD("set_color_phase_pos", "phase", "pos"), &Particles2D::set_color_phase_pos);
	ClassDB::bind_method(D_METHOD("get_color_phase_pos", "phase"), &Particles2D::get_color_phase_pos);

	ClassDB::bind_method(D_METHOD("pre_process", "time"), &Particles2D::pre_process);
	ClassDB::bind_method(D_METHOD("reset"), &Particles2D::reset);

	ClassDB::bind_method(D_METHOD("set_use_local_space", "enable"), &Particles2D::set_use_local_space);
	ClassDB::bind_method(D_METHOD("is_using_local_space"), &Particles2D::is_using_local_space);

	ClassDB::bind_method(D_METHOD("set_initial_velocity", "velocity"), &Particles2D::set_initial_velocity);
	ClassDB::bind_method(D_METHOD("get_initial_velocity"), &Particles2D::get_initial_velocity);

	ClassDB::bind_method(D_METHOD("set_explosiveness", "amount"), &Particles2D::set_explosiveness);
	ClassDB::bind_method(D_METHOD("get_explosiveness"), &Particles2D::get_explosiveness);

	ClassDB::bind_method(D_METHOD("set_emission_points", "points"), &Particles2D::set_emission_points);
	ClassDB::bind_method(D_METHOD("get_emission_points"), &Particles2D::get_emission_points);

	ADD_SIGNAL(MethodInfo("emission_finished"));

	ADD_PROPERTY(PropertyInfo(Variant::INT, "config/amount", PROPERTY_HINT_EXP_RANGE, "1,1024"), "set_amount", "get_amount");
	ADD_PROPERTY(PropertyInfo(Variant::REAL, "config/lifetime", PROPERTY_HINT_EXP_RANGE, "0.1,3600,0.1"), "set_lifetime", "get_lifetime");
	ADD_PROPERTYNO(PropertyInfo(Variant::REAL, "config/time_scale", PROPERTY_HINT_EXP_RANGE, "0.01,128,0.01"), "set_time_scale", "get_time_scale");
	ADD_PROPERTYNZ(PropertyInfo(Variant::REAL, "config/preprocess", PROPERTY_HINT_EXP_RANGE, "0,3600,0.1"), "set_pre_process_time", "get_pre_process_time");
	ADD_PROPERTYNZ(PropertyInfo(Variant::REAL, "config/emit_timeout", PROPERTY_HINT_RANGE, "0,3600,0.1"), "set_emit_timeout", "get_emit_timeout");
	ADD_PROPERTYNO(PropertyInfo(Variant::BOOL, "config/emitting"), "set_emitting", "is_emitting");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "config/process_mode", PROPERTY_HINT_ENUM, "Fixed,Idle"), "set_process_mode", "get_process_mode");
	ADD_PROPERTYNZ(PropertyInfo(Variant::VECTOR2, "config/offset"), "set_emissor_offset", "get_emissor_offset");
	ADD_PROPERTYNZ(PropertyInfo(Variant::VECTOR2, "config/half_extents"), "set_emission_half_extents", "get_emission_half_extents");
	ADD_PROPERTYNO(PropertyInfo(Variant::BOOL, "config/local_space"), "set_use_local_space", "is_using_local_space");
	ADD_PROPERTYNO(PropertyInfo(Variant::REAL, "config/explosiveness", PROPERTY_HINT_RANGE, "0,1,0.01"), "set_explosiveness", "get_explosiveness");
	ADD_PROPERTYNZ(PropertyInfo(Variant::BOOL, "config/flip_h"), "set_flip_h", "is_flipped_h");
	ADD_PROPERTYNZ(PropertyInfo(Variant::BOOL, "config/flip_v"), "set_flip_v", "is_flipped_v");
	ADD_PROPERTYNZ(PropertyInfo(Variant::OBJECT, "config/texture", PROPERTY_HINT_RESOURCE_TYPE, "Texture"), "set_texture", "get_texture");
	ADD_PROPERTYNO(PropertyInfo(Variant::INT, "config/h_frames", PROPERTY_HINT_RANGE, "1,512,1"), "set_h_frames", "get_h_frames");
	ADD_PROPERTYNO(PropertyInfo(Variant::INT, "config/v_frames", PROPERTY_HINT_RANGE, "1,512,1"), "set_v_frames", "get_v_frames");

	for (int i = 0; i < PARAM_MAX; i++) {
		ADD_PROPERTYI(PropertyInfo(Variant::REAL, _particlesframe_property_names[i], PROPERTY_HINT_RANGE, _particlesframe_property_ranges[i]), "set_param", "get_param", i);
	}

	for (int i = 0; i < PARAM_MAX; i++) {
		ADD_PROPERTYINZ(PropertyInfo(Variant::REAL, _particlesframe_property_rnames[i], PROPERTY_HINT_RANGE, "-1,1,0.01"), "set_randomness", "get_randomness", i);
	}

	ADD_PROPERTYNZ(PropertyInfo(Variant::INT, "color_phases/count", PROPERTY_HINT_RANGE, "0,4,1", 0), "set_color_phases", "get_color_phases");

	//Backward compatibility. They will be converted to color ramp
	for (int i = 0; i < MAX_COLOR_PHASES; i++) {
		String phase = "phase_" + itos(i) + "/";
		ADD_PROPERTYI(PropertyInfo(Variant::REAL, phase + "pos", PROPERTY_HINT_RANGE, "0,1,0.01", 0), "set_color_phase_pos", "get_color_phase_pos", i);
		ADD_PROPERTYI(PropertyInfo(Variant::COLOR, phase + "color", PROPERTY_HINT_NONE, "", 0), "set_color_phase_color", "get_color_phase_color", i);
	}

	ADD_PROPERTYNO(PropertyInfo(Variant::COLOR, "color/color"), "set_color", "get_color");
	ADD_PROPERTYNZ(PropertyInfo(Variant::OBJECT, "color/color_ramp", PROPERTY_HINT_RESOURCE_TYPE, "ColorRamp"), "set_color_ramp", "get_color_ramp");

	ADD_PROPERTYNZ(PropertyInfo(Variant::POOL_VECTOR2_ARRAY, "emission_points", PROPERTY_HINT_NONE, "", PROPERTY_USAGE_NOEDITOR), "set_emission_points", "get_emission_points");

	BIND_CONSTANT(PARAM_DIRECTION);
	BIND_CONSTANT(PARAM_SPREAD);
	BIND_CONSTANT(PARAM_LINEAR_VELOCITY);
	BIND_CONSTANT(PARAM_SPIN_VELOCITY);
	BIND_CONSTANT(PARAM_ORBIT_VELOCITY);
	BIND_CONSTANT(PARAM_GRAVITY_DIRECTION);
	BIND_CONSTANT(PARAM_GRAVITY_STRENGTH);
	BIND_CONSTANT(PARAM_RADIAL_ACCEL);
	BIND_CONSTANT(PARAM_TANGENTIAL_ACCEL);
	BIND_CONSTANT(PARAM_DAMPING);
	BIND_CONSTANT(PARAM_INITIAL_ANGLE);
	BIND_CONSTANT(PARAM_INITIAL_SIZE);
	BIND_CONSTANT(PARAM_FINAL_SIZE);
	BIND_CONSTANT(PARAM_HUE_VARIATION);
	BIND_CONSTANT(PARAM_ANIM_SPEED_SCALE);
	BIND_CONSTANT(PARAM_ANIM_INITIAL_POS);
	BIND_CONSTANT(PARAM_MAX);

	BIND_CONSTANT(MAX_COLOR_PHASES);
}

Particles2D::Particles2D() {

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

		param[i] = 0;
		randomness[i] = 0;
	}

	set_param(PARAM_SPREAD, 10);
	set_param(PARAM_LINEAR_VELOCITY, 20);
	set_param(PARAM_GRAVITY_STRENGTH, 9.8);
	set_param(PARAM_RADIAL_ACCEL, 0);
	set_param(PARAM_TANGENTIAL_ACCEL, 0);
	set_param(PARAM_INITIAL_ANGLE, 0.0);
	set_param(PARAM_INITIAL_SIZE, 1.0);
	set_param(PARAM_FINAL_SIZE, 1.0);
	set_param(PARAM_ANIM_SPEED_SCALE, 1.0);

	set_color(Color(1, 1, 1, 1));

	time = 0;
	lifetime = 2;
	emitting = false;
	particles.resize(32);
	active_count = -1;
	set_emitting(true);
	process_mode = PROCESS_IDLE;
	local_space = true;
	preprocess = 0;
	time_scale = 1.0;

	flip_h = false;
	flip_v = false;

	v_frames = 1;
	h_frames = 1;

	emit_timeout = 0;
	time_to_live = 0;
	explosiveness = 1.0;
}