/*************************************************************************/
/*  immediate_geometry.cpp                                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* 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 "immediate_geometry.h"


void ImmediateGeometry::begin(Mesh::PrimitiveType p_primitive,const Ref<Texture>& p_texture) {

	VS::get_singleton()->immediate_begin(im,(VS::PrimitiveType)p_primitive,p_texture.is_valid()?p_texture->get_rid():RID());
	if (p_texture.is_valid())
		cached_textures.push_back(p_texture);

}

void ImmediateGeometry::set_normal(const Vector3& p_normal){

	VS::get_singleton()->immediate_normal(im,p_normal);
}

void ImmediateGeometry::set_tangent(const Plane& p_tangent){

	VS::get_singleton()->immediate_tangent(im,p_tangent);

}

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

	VS::get_singleton()->immediate_color(im,p_color);

}

void ImmediateGeometry::set_uv(const Vector2& p_uv){

	VS::get_singleton()->immediate_uv(im,p_uv);

}

void ImmediateGeometry::set_uv2(const Vector2& p_uv2){

	VS::get_singleton()->immediate_uv2(im,p_uv2);

}

void ImmediateGeometry::add_vertex(const Vector3& p_vertex){

	VS::get_singleton()->immediate_vertex(im,p_vertex);
	if (empty) {
		aabb.pos=p_vertex;
		aabb.size=Vector3();
		empty=false;
	} else {
		aabb.expand_to(p_vertex);
	}
}

void ImmediateGeometry::end(){

	VS::get_singleton()->immediate_end(im);

}

void ImmediateGeometry::clear(){

	VS::get_singleton()->immediate_clear(im);
	empty=true;
	cached_textures.clear();

}

AABB ImmediateGeometry::get_aabb() const {

	return aabb;
}
DVector<Face3> ImmediateGeometry::get_faces(uint32_t p_usage_flags) const {

	return DVector<Face3>();
}



void ImmediateGeometry::add_sphere(int p_lats, int p_lons, float p_radius, bool p_add_uv) {

	for(int i = 1; i <= p_lats; i++) {
		double lat0 = Math_PI * (-0.5 + (double) (i - 1) / p_lats);
		double z0  = Math::sin(lat0);
		double zr0 =  Math::cos(lat0);

		double lat1 = Math_PI * (-0.5 + (double) i / p_lats);
		double z1 = Math::sin(lat1);
		double zr1 = Math::cos(lat1);

		for(int j = p_lons; j >= 1; j--) {

			double lng0 = 2 * Math_PI * (double) (j - 1) / p_lons;
			double x0 = Math::cos(lng0);
			double y0 = Math::sin(lng0);

			double lng1 = 2 * Math_PI * (double) (j) / p_lons;
			double x1 = Math::cos(lng1);
			double y1 = Math::sin(lng1);


			Vector3 v[4]={
				Vector3(x1 * zr0, z0, y1 *zr0),
				Vector3(x1 * zr1, z1, y1 *zr1),
				Vector3(x0 * zr1, z1, y0 *zr1),
				Vector3(x0 * zr0, z0, y0 *zr0)
			};

#define ADD_POINT(m_idx)\
	if (p_add_uv) {\
		set_uv(Vector2(Math::atan2(v[m_idx].x,v[m_idx].z)/Math_PI * 0.5+0.5,v[m_idx].y*0.5+0.5));\
		set_tangent(Plane(Vector3(-v[m_idx].z,v[m_idx].y,v[m_idx].x),1));		\
	}\
	set_normal(v[m_idx]);\
	add_vertex(v[m_idx]*p_radius);

			ADD_POINT(0);
			ADD_POINT(1);
			ADD_POINT(2);

			ADD_POINT(2);
			ADD_POINT(3);
			ADD_POINT(0);
		}
	}

}

void ImmediateGeometry::_bind_methods() {

	ClassDB::bind_method(_MD("begin","primitive","texture:Texture"),&ImmediateGeometry::begin,DEFVAL(Ref<Texture>()));
	ClassDB::bind_method(_MD("set_normal","normal"),&ImmediateGeometry::set_normal);
	ClassDB::bind_method(_MD("set_tangent","tangent"),&ImmediateGeometry::set_tangent);
	ClassDB::bind_method(_MD("set_color","color"),&ImmediateGeometry::set_color);
	ClassDB::bind_method(_MD("set_uv","uv"),&ImmediateGeometry::set_uv);
	ClassDB::bind_method(_MD("set_uv2","uv"),&ImmediateGeometry::set_uv2);
	ClassDB::bind_method(_MD("add_vertex","pos"),&ImmediateGeometry::add_vertex);
	ClassDB::bind_method(_MD("add_sphere","lats","lons","radius","add_uv"),&ImmediateGeometry::add_sphere,DEFVAL(true));
	ClassDB::bind_method(_MD("end"),&ImmediateGeometry::end);
	ClassDB::bind_method(_MD("clear"),&ImmediateGeometry::clear);

}



ImmediateGeometry::ImmediateGeometry() {

	im = VisualServer::get_singleton()->immediate_create();
	set_base(im);
	empty=true;

}


ImmediateGeometry::~ImmediateGeometry() {

	VisualServer::get_singleton()->free(im);

}