godot/editor/plugins/baked_light_baker.cpp

/*************************************************************************/
/*  baked_light_baker.cpp                                                */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 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:                                             */
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/* 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 "baked_light_baker.h"
#include "editor/editor_node.h"
#include "editor/editor_settings.h"
#include "io/marshalls.h"
#include <stdlib.h>
#include <cmath>

void baked_light_baker_add_64f(double *dst, double value);
void baked_light_baker_add_64i(int64_t *dst, int64_t value);

//-separar en 2 testuras?
//*mejorar performance y threads
//*modos lineales
//*saturacion

_FORCE_INLINE_ static uint64_t get_uv_normal_bit(const Vector3 &p_vector) {

	int lat = Math::fast_ftoi(Math::floor(Math::acos(p_vector.dot(Vector3(0, 1, 0))) * 6.0 / Math_PI + 0.5));

	if (lat == 0) {
		return 60;
	} else if (lat == 6) {
		return 61;
	}

	int lon = Math::fast_ftoi(Math::floor((Math_PI + Math::atan2(p_vector.x, p_vector.z)) * 12.0 / (Math_PI * 2.0) + 0.5)) % 12;

	return lon + (lat - 1) * 12;
}

_FORCE_INLINE_ static Vector3 get_bit_normal(int p_bit) {

	if (p_bit == 61) {
		return Vector3(0, 1, 0);
	} else if (p_bit == 62) {
		return Vector3(0, -1, 0);
	}

	float latang = ((p_bit / 12) + 1) * Math_PI / 6.0;

	Vector2 latv(Math::sin(latang), Math::cos(latang));

	float lonang = ((p_bit % 12) * Math_PI * 2.0 / 12.0) - Math_PI;

	Vector2 lonv(Math::sin(lonang), Math::cos(lonang));

	return Vector3(lonv.x * latv.x, latv.y, lonv.y * latv.x).normalized();
}

BakedLightBaker::MeshTexture *BakedLightBaker::_get_mat_tex(const Ref<Texture> &p_tex) {

	if (!tex_map.has(p_tex)) {

		Ref<ImageTexture> imgtex = p_tex;
		if (imgtex.is_null())
			return NULL;
		Image image = imgtex->get_data();
		if (image.empty())
			return NULL;

		if (image.get_format() != Image::FORMAT_RGBA) {
			if (image.get_format() > Image::FORMAT_INDEXED_ALPHA) {
				Error err = image.decompress();
				if (err)
					return NULL;
			}

			if (image.get_format() != Image::FORMAT_RGBA)
				image.convert(Image::FORMAT_RGBA);
		}

		if (imgtex->get_flags() & Texture::FLAG_CONVERT_TO_LINEAR) {
			Image copy = image;
			copy.srgb_to_linear();
			image = copy;
		}

		DVector<uint8_t> dvt = image.get_data();
		DVector<uint8_t>::Read r = dvt.read();
		MeshTexture mt;
		mt.tex_w = image.get_width();
		mt.tex_h = image.get_height();
		int len = image.get_width() * image.get_height() * 4;
		mt.tex.resize(len);
		copymem(mt.tex.ptr(), r.ptr(), len);

		textures.push_back(mt);
		tex_map[p_tex] = &textures.back()->get();
	}

	return tex_map[p_tex];
}

void BakedLightBaker::_add_mesh(const Ref<Mesh> &p_mesh, const Ref<Material> &p_mat_override, const Transform &p_xform, int p_baked_texture) {

	for (int i = 0; i < p_mesh->get_surface_count(); i++) {

		if (p_mesh->surface_get_primitive_type(i) != Mesh::PRIMITIVE_TRIANGLES)
			continue;
		Ref<Material> mat = p_mat_override.is_valid() ? p_mat_override : p_mesh->surface_get_material(i);

		MeshMaterial *matptr = NULL;
		int baked_tex = p_baked_texture;

		if (mat.is_valid()) {

			if (!mat_map.has(mat)) {

				MeshMaterial mm;

				Ref<FixedMaterial> fm = mat;
				if (fm.is_valid()) {
					//fixed route
					mm.diffuse.color = fm->get_parameter(FixedMaterial::PARAM_DIFFUSE);
					if (linear_color)
						mm.diffuse.color = mm.diffuse.color.to_linear();
					mm.diffuse.tex = _get_mat_tex(fm->get_texture(FixedMaterial::PARAM_DIFFUSE));
					mm.specular.color = fm->get_parameter(FixedMaterial::PARAM_SPECULAR);
					if (linear_color)
						mm.specular.color = mm.specular.color.to_linear();

					mm.specular.tex = _get_mat_tex(fm->get_texture(FixedMaterial::PARAM_SPECULAR));
				} else {

					mm.diffuse.color = Color(1, 1, 1, 1);
					mm.diffuse.tex = NULL;
					mm.specular.color = Color(0, 0, 0, 1);
					mm.specular.tex = NULL;
				}

				materials.push_back(mm);
				mat_map[mat] = &materials.back()->get();
			}

			matptr = mat_map[mat];
		}

		int facecount = 0;

		if (p_mesh->surface_get_format(i) & Mesh::ARRAY_FORMAT_INDEX) {

			facecount = p_mesh->surface_get_array_index_len(i);
		} else {

			facecount = p_mesh->surface_get_array_len(i);
		}

		ERR_CONTINUE((facecount == 0 || (facecount % 3) != 0));

		facecount /= 3;

		int tbase = triangles.size();
		triangles.resize(facecount + tbase);

		Array a = p_mesh->surface_get_arrays(i);

		DVector<Vector3> vertices = a[Mesh::ARRAY_VERTEX];
		DVector<Vector3>::Read vr = vertices.read();
		DVector<Vector2> uv;
		DVector<Vector2>::Read uvr;
		DVector<Vector2> uv2;
		DVector<Vector2>::Read uv2r;
		DVector<Vector3> normal;
		DVector<Vector3>::Read normalr;
		bool read_uv = false;
		bool read_normal = false;

		if (p_mesh->surface_get_format(i) & Mesh::ARRAY_FORMAT_TEX_UV) {

			uv = a[Mesh::ARRAY_TEX_UV];
			uvr = uv.read();
			read_uv = true;

			if (mat.is_valid() && mat->get_flag(Material::FLAG_LIGHTMAP_ON_UV2) && p_mesh->surface_get_format(i) & Mesh::ARRAY_FORMAT_TEX_UV2) {

				uv2 = a[Mesh::ARRAY_TEX_UV2];
				uv2r = uv2.read();

			} else {
				uv2r = uv.read();
				if (baked_light->get_transfer_lightmaps_only_to_uv2()) {
					baked_tex = -1;
				}
			}
		}

		if (p_mesh->surface_get_format(i) & Mesh::ARRAY_FORMAT_NORMAL) {

			normal = a[Mesh::ARRAY_NORMAL];
			normalr = normal.read();
			read_normal = true;
		}

		Matrix3 normal_xform = p_xform.basis.inverse().transposed();

		if (p_mesh->surface_get_format(i) & Mesh::ARRAY_FORMAT_INDEX) {

			DVector<int> indices = a[Mesh::ARRAY_INDEX];
			DVector<int>::Read ir = indices.read();

			for (int i = 0; i < facecount; i++) {
				Triangle &t = triangles[tbase + i];
				t.vertices[0] = p_xform.xform(vr[ir[i * 3 + 0]]);
				t.vertices[1] = p_xform.xform(vr[ir[i * 3 + 1]]);
				t.vertices[2] = p_xform.xform(vr[ir[i * 3 + 2]]);
				t.material = matptr;
				t.baked_texture = baked_tex;
				if (read_uv) {

					t.uvs[0] = uvr[ir[i * 3 + 0]];
					t.uvs[1] = uvr[ir[i * 3 + 1]];
					t.uvs[2] = uvr[ir[i * 3 + 2]];

					t.bake_uvs[0] = uv2r[ir[i * 3 + 0]];
					t.bake_uvs[1] = uv2r[ir[i * 3 + 1]];
					t.bake_uvs[2] = uv2r[ir[i * 3 + 2]];
				}
				if (read_normal) {

					t.normals[0] = normal_xform.xform(normalr[ir[i * 3 + 0]]).normalized();
					t.normals[1] = normal_xform.xform(normalr[ir[i * 3 + 1]]).normalized();
					t.normals[2] = normal_xform.xform(normalr[ir[i * 3 + 2]]).normalized();
				}
			}

		} else {

			for (int i = 0; i < facecount; i++) {
				Triangle &t = triangles[tbase + i];
				t.vertices[0] = p_xform.xform(vr[i * 3 + 0]);
				t.vertices[1] = p_xform.xform(vr[i * 3 + 1]);
				t.vertices[2] = p_xform.xform(vr[i * 3 + 2]);
				t.material = matptr;
				t.baked_texture = baked_tex;
				if (read_uv) {

					t.uvs[0] = uvr[i * 3 + 0];
					t.uvs[1] = uvr[i * 3 + 1];
					t.uvs[2] = uvr[i * 3 + 2];

					t.bake_uvs[0] = uv2r[i * 3 + 0];
					t.bake_uvs[1] = uv2r[i * 3 + 1];
					t.bake_uvs[2] = uv2r[i * 3 + 2];
				}
				if (read_normal) {

					t.normals[0] = normal_xform.xform(normalr[i * 3 + 0]).normalized();
					t.normals[1] = normal_xform.xform(normalr[i * 3 + 1]).normalized();
					t.normals[2] = normal_xform.xform(normalr[i * 3 + 2]).normalized();
				}
			}
		}
	}
}

void BakedLightBaker::_parse_geometry(Node *p_node) {

	if (p_node->cast_to<MeshInstance>()) {

		MeshInstance *meshi = p_node->cast_to<MeshInstance>();
		Ref<Mesh> mesh = meshi->get_mesh();
		if (mesh.is_valid()) {
			_add_mesh(mesh, meshi->get_material_override(), base_inv * meshi->get_global_transform(), meshi->get_baked_light_texture_id());
		}
	} else if (p_node->cast_to<Light>()) {

		Light *dl = p_node->cast_to<Light>();

		if (dl->get_bake_mode() != Light::BAKE_MODE_DISABLED) {

			LightData dirl;
			dirl.type = VS::LightType(dl->get_light_type());
			dirl.diffuse = dl->get_color(DirectionalLight::COLOR_DIFFUSE);
			dirl.specular = dl->get_color(DirectionalLight::COLOR_SPECULAR);
			if (linear_color)
				dirl.diffuse = dirl.diffuse.to_linear();
			if (linear_color)
				dirl.specular = dirl.specular.to_linear();

			dirl.energy = dl->get_parameter(DirectionalLight::PARAM_ENERGY);
			dirl.pos = dl->get_global_transform().origin;
			dirl.up = dl->get_global_transform().basis.get_axis(1).normalized();
			dirl.left = dl->get_global_transform().basis.get_axis(0).normalized();
			dirl.dir = -dl->get_global_transform().basis.get_axis(2).normalized();
			dirl.spot_angle = dl->get_parameter(DirectionalLight::PARAM_SPOT_ANGLE);
			dirl.spot_attenuation = dl->get_parameter(DirectionalLight::PARAM_SPOT_ATTENUATION);
			dirl.attenuation = dl->get_parameter(DirectionalLight::PARAM_ATTENUATION);
			dirl.darkening = dl->get_parameter(DirectionalLight::PARAM_SHADOW_DARKENING);
			dirl.radius = dl->get_parameter(DirectionalLight::PARAM_RADIUS);
			dirl.bake_direct = dl->get_bake_mode() == Light::BAKE_MODE_FULL;
			dirl.rays_thrown = 0;
			dirl.bake_shadow = dl->get_bake_mode() == Light::BAKE_MODE_INDIRECT_AND_SHADOWS;
			lights.push_back(dirl);
		}

	} else if (p_node->cast_to<Spatial>()) {

		Spatial *sp = p_node->cast_to<Spatial>();

		Array arr = p_node->call("_get_baked_light_meshes");
		for (int i = 0; i < arr.size(); i += 2) {

			Transform xform = arr[i];
			Ref<Mesh> mesh = arr[i + 1];
			_add_mesh(mesh, Ref<Material>(), base_inv * (sp->get_global_transform() * xform));
		}
	}

	for (int i = 0; i < p_node->get_child_count(); i++) {

		_parse_geometry(p_node->get_child(i));
	}
}

void BakedLightBaker::_fix_lights() {

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

		LightData &dl = lights[i];

		switch (dl.type) {
			case VS::LIGHT_DIRECTIONAL: {

				float up_max = -1e10;
				float dir_max = -1e10;
				float left_max = -1e10;
				float up_min = 1e10;
				float dir_min = 1e10;
				float left_min = 1e10;

				for (int j = 0; j < triangles.size(); j++) {

					for (int k = 0; k < 3; k++) {

						Vector3 v = triangles[j].vertices[k];

						float up_d = dl.up.dot(v);
						float dir_d = dl.dir.dot(v);
						float left_d = dl.left.dot(v);

						if (up_d > up_max)
							up_max = up_d;
						if (up_d < up_min)
							up_min = up_d;

						if (left_d > left_max)
							left_max = left_d;
						if (left_d < left_min)
							left_min = left_d;

						if (dir_d > dir_max)
							dir_max = dir_d;
						if (dir_d < dir_min)
							dir_min = dir_d;
					}
				}

				//make a center point, then the upvector and leftvector
				dl.pos = dl.left * (left_max + left_min) * 0.5 + dl.up * (up_max + up_min) * 0.5 + dl.dir * (dir_min - (dir_max - dir_min));
				dl.left *= (left_max - left_min) * 0.5;
				dl.up *= (up_max - up_min) * 0.5;
				dl.length = (dir_max - dir_min) * 10; //arbitrary number to keep it in scale
				dl.area = dl.left.length() * 2 * dl.up.length() * 2;
				dl.constant = 1.0 / dl.area;
			} break;
			case VS::LIGHT_OMNI:
			case VS::LIGHT_SPOT: {

				dl.attenuation_table.resize(ATTENUATION_CURVE_LEN);
				for (int j = 0; j < ATTENUATION_CURVE_LEN; j++) {
					dl.attenuation_table[j] = 1.0 - Math::pow(j / float(ATTENUATION_CURVE_LEN), dl.attenuation);
					float falloff = j * dl.radius / float(ATTENUATION_CURVE_LEN);
					if (falloff == 0)
						falloff = 0.000001;
					float intensity = 4 * Math_PI * (falloff * falloff);
					//dl.attenuation_table[j]*=falloff*falloff;
					dl.attenuation_table[j] *= 1.0 / (3.0 / intensity);
				}
				if (dl.type == VS::LIGHT_OMNI) {

					dl.area = 4.0 * Math_PI * pow(dl.radius, 2.0f);
					dl.constant = 1.0 / 3.5;
				} else {

					float r = Math::tan(Math::deg2rad(dl.spot_angle)) * dl.radius;
					float c = 1.0 - (Math::deg2rad(dl.spot_angle) * 0.5 + 0.5);
					dl.constant = 1.0 / 3.5;
					dl.constant *= 1.0 / c;

					dl.area = Math_PI * r * r * c;
				}

			} break;
		}

		total_light_area += dl.area;
	}
}

BakedLightBaker::BVH *BakedLightBaker::_parse_bvh(BVH **p_children, int p_size, int p_depth, int &max_depth) {

	if (p_depth > max_depth) {
		max_depth = p_depth;
	}

	if (p_size == 1) {

		return p_children[0];
	} else if (p_size == 0) {

		return NULL;
	}

	AABB aabb;
	aabb = p_children[0]->aabb;
	for (int i = 1; i < p_size; i++) {

		aabb.merge_with(p_children[i]->aabb);
	}

	int li = aabb.get_longest_axis_index();

	switch (li) {

		case Vector3::AXIS_X: {
			SortArray<BVH *, BVHCmpX> sort_x;
			sort_x.nth_element(0, p_size, p_size / 2, p_children);
			//sort_x.sort(&p_bb[p_from],p_size);
		} break;
		case Vector3::AXIS_Y: {
			SortArray<BVH *, BVHCmpY> sort_y;
			sort_y.nth_element(0, p_size, p_size / 2, p_children);
			//sort_y.sort(&p_bb[p_from],p_size);
		} break;
		case Vector3::AXIS_Z: {
			SortArray<BVH *, BVHCmpZ> sort_z;
			sort_z.nth_element(0, p_size, p_size / 2, p_children);
			//sort_z.sort(&p_bb[p_from],p_size);

		} break;
	}

	BVH *left = _parse_bvh(p_children, p_size / 2, p_depth + 1, max_depth);
	BVH *right = _parse_bvh(&p_children[p_size / 2], p_size - p_size / 2, p_depth + 1, max_depth);

	BVH *_new = memnew(BVH);
	_new->aabb = aabb;
	_new->center = aabb.pos + aabb.size * 0.5;
	_new->children[0] = left;
	_new->children[1] = right;
	_new->leaf = NULL;

	return _new;
}

void BakedLightBaker::_make_bvh() {

	Vector<BVH *> bases;
	bases.resize(triangles.size());
	int max_depth = 0;
	for (int i = 0; i < triangles.size(); i++) {
		bases[i] = memnew(BVH);
		bases[i]->leaf = &triangles[i];
		bases[i]->aabb.pos = triangles[i].vertices[0];
		bases[i]->aabb.expand_to(triangles[i].vertices[1]);
		bases[i]->aabb.expand_to(triangles[i].vertices[2]);
		triangles[i].aabb = bases[i]->aabb;
		bases[i]->center = bases[i]->aabb.pos + bases[i]->aabb.size * 0.5;
	}

	bvh = _parse_bvh(bases.ptr(), bases.size(), 1, max_depth);

	ray_stack = memnew_arr(uint32_t, max_depth);
	bvh_stack = memnew_arr(BVH *, max_depth);

	bvh_depth = max_depth;
}

void BakedLightBaker::_octree_insert(int p_octant, Triangle *p_triangle, int p_depth) {

	uint32_t *stack = octant_stack;
	uint32_t *ptr_stack = octantptr_stack;
	Octant *octants = octant_pool.ptr();

	stack[0] = 0;
	ptr_stack[0] = 0;

	int stack_pos = 0;

	while (true) {

		Octant *octant = &octants[ptr_stack[stack_pos]];
		if (stack[stack_pos] < 8) {

			int i = stack[stack_pos];
			stack[stack_pos]++;

			//fit_aabb=fit_aabb.grow(bvh->aabb.size.x*0.0001);

			int child_idx = octant->children[i];
			bool encloses;
			if (!child_idx) {

				AABB aabb = octant->aabb;
				aabb.size *= 0.5;
				if (i & 1)
					aabb.pos.x += aabb.size.x;
				if (i & 2)
					aabb.pos.y += aabb.size.y;
				if (i & 4)
					aabb.pos.z += aabb.size.z;

				aabb.grow_by(cell_size * octree_extra_margin);
				if (!aabb.intersects(p_triangle->aabb))
					continue;
				encloses = aabb.grow(cell_size * -octree_extra_margin * 2.0).encloses(p_triangle->aabb);
				if (!encloses && !Face3(p_triangle->vertices[0], p_triangle->vertices[1], p_triangle->vertices[2]).intersects_aabb2(aabb))
					continue;
			} else {

				Octant *child = &octants[child_idx];
				AABB aabb = child->aabb;
				aabb.grow_by(cell_size * octree_extra_margin);
				if (!aabb.intersects(p_triangle->aabb))
					continue;
				encloses = aabb.grow(cell_size * -octree_extra_margin * 2.0).encloses(p_triangle->aabb);
				if (!encloses && !Face3(p_triangle->vertices[0], p_triangle->vertices[1], p_triangle->vertices[2]).intersects_aabb2(aabb))
					continue;
			}

			if (encloses)
				stack[stack_pos] = 8; // quick and dirty opt

			if (!child_idx) {

				if (octant_pool_size == octant_pool.size()) {
					octant_pool.resize(octant_pool_size + OCTANT_POOL_CHUNK);
					octants = octant_pool.ptr();
					octant = &octants[ptr_stack[stack_pos]];
				}
				child_idx = octant_pool_size++;
				octant->children[i] = child_idx;
				Octant *child = &octants[child_idx];

				child->aabb = octant->aabb;
				child->texture_x = 0;
				child->texture_y = 0;

				child->aabb.size *= 0.5;
				if (i & 1)
					child->aabb.pos.x += child->aabb.size.x;
				if (i & 2)
					child->aabb.pos.y += child->aabb.size.y;
				if (i & 4)
					child->aabb.pos.z += child->aabb.size.z;

				child->full_accum[0] = 0;
				child->full_accum[1] = 0;
				child->full_accum[2] = 0;
				child->sampler_ofs = 0;

				if (stack_pos == octree_depth - 1) {
					child->leaf = true;
					child->offset[0] = child->aabb.pos.x + child->aabb.size.x * 0.5;
					child->offset[1] = child->aabb.pos.y + child->aabb.size.y * 0.5;
					child->offset[2] = child->aabb.pos.z + child->aabb.size.z * 0.5;
					child->next_leaf = leaf_list;

					for (int ci = 0; ci < 8; ci++) {
						child->normal_accum[ci][0] = 0;
						child->normal_accum[ci][1] = 0;
						child->normal_accum[ci][2] = 0;
					}

					child->bake_neighbour = 0;
					child->first_neighbour = true;
					leaf_list = child_idx;
					cell_count++;

					for (int ci = 0; ci < 8; ci++) {
						child->light_accum[ci][0] = 0;
						child->light_accum[ci][1] = 0;
						child->light_accum[ci][2] = 0;
					}

					child->parent = ptr_stack[stack_pos];

				} else {

					child->leaf = false;
					for (int j = 0; j < 8; j++) {
						child->children[j] = 0;
					}
				}
			}

			if (!octants[child_idx].leaf) {
				stack_pos++;
				stack[stack_pos] = 0;
				ptr_stack[stack_pos] = child_idx;
			} else {

				Octant *child = &octants[child_idx];

				Vector3 n = Plane(p_triangle->vertices[0], p_triangle->vertices[1], p_triangle->vertices[2]).normal;

				for (int ci = 0; ci < 8; ci++) {

					Vector3 pos = child->aabb.pos;

					if (ci & 1)
						pos.x += child->aabb.size.x;
					if (ci & 2)
						pos.y += child->aabb.size.y;
					if (ci & 4)
						pos.z += child->aabb.size.z;

					pos.x = floor((pos.x + cell_size * 0.5) / cell_size);
					pos.y = floor((pos.y + cell_size * 0.5) / cell_size);
					pos.z = floor((pos.z + cell_size * 0.5) / cell_size);

					{
						Map<Vector3, Vector3>::Element *E = endpoint_normal.find(pos);
						if (!E) {
							endpoint_normal[pos] = n;
						} else {
							E->get() += n;
						}
					}

					{

						uint64_t bit = get_uv_normal_bit(n);

						Map<Vector3, uint64_t>::Element *E = endpoint_normal_bits.find(pos);
						if (!E) {
							endpoint_normal_bits[pos] = (1 << bit);
						} else {
							E->get() |= (1 << bit);
						}
					}
				}
			}

		} else {
			stack_pos--;
			if (stack_pos < 0)
				break;
		}
	}
}

void BakedLightBaker::_make_octree() {

	AABB base = bvh->aabb;
	float lal = base.get_longest_axis_size();
	//must be square because we want square blocks
	base.size.x = lal;
	base.size.y = lal;
	base.size.z = lal;
	base.grow_by(lal * 0.001); //for precision
	octree_aabb = base;

	cell_size = base.size.x;
	for (int i = 0; i < octree_depth; i++)
		cell_size /= 2.0;
	octant_stack = memnew_arr(uint32_t, octree_depth * 2);
	octantptr_stack = memnew_arr(uint32_t, octree_depth * 2);

	octant_pool.resize(OCTANT_POOL_CHUNK);
	octant_pool_size = 1;
	Octant *root = octant_pool.ptr();
	root->leaf = false;
	root->aabb = octree_aabb;
	root->parent = -1;
	for (int i = 0; i < 8; i++)
		root->children[i] = 0;

	EditorProgress ep("bake_octree", vformat(TTR("Parsing %d Triangles:"), triangles.size()), triangles.size());

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

		_octree_insert(0, &triangles[i], octree_depth - 1);
		if ((i % 1000) == 0) {

			ep.step(TTR("Triangle #") + itos(i), i);
		}
	}

	{
		uint32_t oct_idx = leaf_list;
		Octant *octants = octant_pool.ptr();
		while (oct_idx) {

			BakedLightBaker::Octant *oct = &octants[oct_idx];
			for (int ci = 0; ci < 8; ci++) {

				Vector3 pos = oct->aabb.pos;

				if (ci & 1)
					pos.x += oct->aabb.size.x;
				if (ci & 2)
					pos.y += oct->aabb.size.y;
				if (ci & 4)
					pos.z += oct->aabb.size.z;

				pos.x = floor((pos.x + cell_size * 0.5) / cell_size);
				pos.y = floor((pos.y + cell_size * 0.5) / cell_size);
				pos.z = floor((pos.z + cell_size * 0.5) / cell_size);

				{
					Map<Vector3, Vector3>::Element *E = endpoint_normal.find(pos);
					if (!E) {
						//?
						print_line("lolwut?");
					} else {
						Vector3 n = E->get().normalized();
						oct->normal_accum[ci][0] = n.x;
						oct->normal_accum[ci][1] = n.y;
						oct->normal_accum[ci][2] = n.z;
					}
				}

				{

					Map<Vector3, uint64_t>::Element *E = endpoint_normal_bits.find(pos);
					if (!E) {
						//?
						print_line("lolwut?");
					} else {

						float max_aper = 0;
						for (uint64_t i = 0; i < 62; i++) {

							if (!(E->get() & (1 << i)))
								continue;
							Vector3 ang_i = get_bit_normal(i);

							for (uint64_t j = 0; j < 62; j++) {

								if (i == j)
									continue;
								if (!(E->get() & (1 << j)))
									continue;
								Vector3 ang_j = get_bit_normal(j);
								float ang = Math::acos(ang_i.dot(ang_j));
								if (ang > max_aper)
									max_aper = ang;
							}
						}
						if (max_aper > 0.75 * Math_PI) {
							//angle too wide prevent problems and forget
							oct->normal_accum[ci][0] = 0;
							oct->normal_accum[ci][1] = 0;
							oct->normal_accum[ci][2] = 0;
						}
					}
				}
			}

			oct_idx = oct->next_leaf;
		}
	}
}

void BakedLightBaker::_plot_light(ThreadStack &thread_stack, const Vector3 &p_plot_pos, const AABB &p_plot_aabb, const Color &p_light, const Color &p_tint_light, bool p_only_full, const Plane &p_plane) {

	//stackless version

	uint32_t *stack = thread_stack.octant_stack;
	uint32_t *ptr_stack = thread_stack.octantptr_stack;
	Octant *octants = octant_pool.ptr();

	stack[0] = 0;
	ptr_stack[0] = 0;

	int stack_pos = 0;

	while (true) {

		Octant &octant = octants[ptr_stack[stack_pos]];

		if (stack[stack_pos] == 0) {

			Vector3 pos = octant.aabb.pos + octant.aabb.size * 0.5;
			float md = 1 << (octree_depth - stack_pos);
			float r = cell_size * plot_size * md;
			float div = 1.0 / (md * md * md);
			//div=1.0;

			float d = p_plot_pos.distance_to(pos);

			if ((p_plane.distance_to(pos) > -cell_size * 1.75 * md) && d <= r) {

				float intensity = 1.0 - (d / r) * (d / r); //not gauss but..

				baked_light_baker_add_64f(&octant.full_accum[0], p_tint_light.r * intensity * div);
				baked_light_baker_add_64f(&octant.full_accum[1], p_tint_light.g * intensity * div);
				baked_light_baker_add_64f(&octant.full_accum[2], p_tint_light.b * intensity * div);
			}
		}

		if (octant.leaf) {

			//if (p_plane.normal.dot(octant.aabb.get_support(p_plane.normal)) < p_plane.d-CMP_EPSILON) { //octants behind are no go

			if (!p_only_full) {
				float r = cell_size * plot_size;
				for (int i = 0; i < 8; i++) {
					Vector3 pos = octant.aabb.pos;
					if (i & 1)
						pos.x += octant.aabb.size.x;
					if (i & 2)
						pos.y += octant.aabb.size.y;
					if (i & 4)
						pos.z += octant.aabb.size.z;

					float d = p_plot_pos.distance_to(pos);

					if ((p_plane.distance_to(pos) > -cell_size * 1.75) && d <= r) {

						float intensity = 1.0 - (d / r) * (d / r); //not gauss but..
						if (edge_damp > 0) {
							Vector3 normal = Vector3(octant.normal_accum[i][0], octant.normal_accum[i][1], octant.normal_accum[i][2]);
							if (normal.x > 0 || normal.y > 0 || normal.z > 0) {

								float damp = Math::abs(p_plane.normal.dot(normal));
								intensity *= pow(damp, edge_damp);
							}
						}

						//intensity*=1.0-Math::abs(p_plane.distance_to(pos))/(plot_size*cell_size);
						//intensity = Math::cos(d*Math_PI*0.5/r);

						baked_light_baker_add_64f(&octant.light_accum[i][0], p_light.r * intensity);
						baked_light_baker_add_64f(&octant.light_accum[i][1], p_light.g * intensity);
						baked_light_baker_add_64f(&octant.light_accum[i][2], p_light.b * intensity);
					}
				}
			}

			stack_pos--;
		} else if (stack[stack_pos] < 8) {

			int i = stack[stack_pos];
			stack[stack_pos]++;

			if (!octant.children[i]) {
				continue;
			}

			Octant &child = octants[octant.children[i]];

			if (!child.aabb.intersects(p_plot_aabb))
				continue;

			if (child.aabb.encloses(p_plot_aabb)) {
				stack[stack_pos] = 8; //don't test the rest
			}

			stack_pos++;
			stack[stack_pos] = 0;
			ptr_stack[stack_pos] = octant.children[i];
		} else {
			stack_pos--;
			if (stack_pos < 0)
				break;
		}
	}
}

float BakedLightBaker::_throw_ray(ThreadStack &thread_stack, bool p_bake_direct, const Vector3 &p_begin, const Vector3 &p_end, float p_rest, const Color &p_light, float *p_att_curve, float p_att_pos, int p_att_curve_len, int p_bounces, bool p_first_bounce, bool p_only_dist) {

	uint32_t *stack = thread_stack.ray_stack;
	BVH **bstack = thread_stack.bvh_stack;

	enum {
		TEST_AABB_BIT = 0,
		VISIT_LEFT_BIT = 1,
		VISIT_RIGHT_BIT = 2,
		VISIT_DONE_BIT = 3,

	};

	Vector3 n = (p_end - p_begin);
	float len = n.length();
	if (len == 0)
		return 0;
	n /= len;

	real_t d = 1e10;
	bool inters = false;
	Vector3 r_normal;
	Vector3 r_point;
	Vector3 end = p_end;

	Triangle *triangle = NULL;

	//for(int i=0;i<max_depth;i++)
	//	stack[i]=0;

	int level = 0;
	//AABB ray_aabb;
	//ray_aabb.pos=p_begin;
	//ray_aabb.expand_to(p_end);

	bstack[0] = bvh;
	stack[0] = TEST_AABB_BIT;

	while (true) {

		uint32_t mode = stack[level];
		const BVH &b = *bstack[level];
		bool done = false;

		switch (mode) {
			case TEST_AABB_BIT: {

				if (b.leaf) {

					Face3 f3(b.leaf->vertices[0], b.leaf->vertices[1], b.leaf->vertices[2]);

					Vector3 res;

					if (f3.intersects_segment(p_begin, end, &res)) {

						float nd = n.dot(res);
						if (nd < d) {

							d = nd;
							r_point = res;
							end = res;
							len = (p_begin - end).length();
							r_normal = f3.get_plane().get_normal();
							triangle = b.leaf;
							inters = true;
						}
					}

					stack[level] = VISIT_DONE_BIT;
				} else {

					bool valid = b.aabb.smits_intersect_ray(p_begin, n, 0, len);
					//bool valid = b.aabb.intersects_segment(p_begin,p_end);
					//				bool valid = b.aabb.intersects(ray_aabb);

					if (!valid) {

						stack[level] = VISIT_DONE_BIT;

					} else {

						stack[level] = VISIT_LEFT_BIT;
					}
				}
			}
				continue;
			case VISIT_LEFT_BIT: {

				stack[level] = VISIT_RIGHT_BIT;
				bstack[level + 1] = b.children[0];
				stack[level + 1] = TEST_AABB_BIT;
				level++;
			}
				continue;
			case VISIT_RIGHT_BIT: {

				stack[level] = VISIT_DONE_BIT;
				bstack[level + 1] = b.children[1];
				stack[level + 1] = TEST_AABB_BIT;
				level++;
			}
				continue;
			case VISIT_DONE_BIT: {

				if (level == 0) {
					done = true;
					break;
				} else
					level--;
			}
				continue;
		}

		if (done)
			break;
	}

	if (inters) {

		if (p_only_dist) {

			return p_begin.distance_to(r_point);
		}

		//should check if there is normals first
		Vector2 uv;
		if (true) {

			triangle->get_uv_and_normal(r_point, uv, r_normal);

		} else {
		}

		if (n.dot(r_normal) > 0)
			return -1;

		if (n.dot(r_normal) > 0)
			r_normal = -r_normal;

		//ok...
		Color diffuse_at_point(0.8, 0.8, 0.8);
		Color specular_at_point(0.0, 0.0, 0.0);

		float dist = p_begin.distance_to(r_point);

		AABB aabb;
		aabb.pos = r_point;
		aabb.pos -= Vector3(1, 1, 1) * cell_size * plot_size;
		aabb.size = Vector3(2, 2, 2) * cell_size * plot_size;

		Color res_light = p_light;
		float att = 1.0;
		float dp = (1.0 - normal_damp) * n.dot(-r_normal) + normal_damp;

		if (p_att_curve) {

			p_att_pos += dist;
			int cpos = Math::fast_ftoi((p_att_pos / p_att_curve_len) * ATTENUATION_CURVE_LEN);
			cpos = CLAMP(cpos, 0, ATTENUATION_CURVE_LEN - 1);
			att = p_att_curve[cpos];
		}

		res_light.r *= dp;
		res_light.g *= dp;
		res_light.b *= dp;

		//light is plotted before multiplication with diffuse, this way
		//the multiplication can happen with more detail in the shader

		if (triangle->material) {

			//triangle->get_uv(r_point);

			diffuse_at_point = triangle->material->diffuse.get_color(uv);
			specular_at_point = triangle->material->specular.get_color(uv);
		}

		diffuse_at_point.r = res_light.r * diffuse_at_point.r;
		diffuse_at_point.g = res_light.g * diffuse_at_point.g;
		diffuse_at_point.b = res_light.b * diffuse_at_point.b;

		float ret = 1e6;

		if (p_bounces > 0) {

			p_rest -= dist;
			if (p_rest < CMP_EPSILON)
				return 0;

			if (r_normal == -n)
				return 0; //todo change a little

			r_point += r_normal * 0.01;

			specular_at_point.r = res_light.r * specular_at_point.r;
			specular_at_point.g = res_light.g * specular_at_point.g;
			specular_at_point.b = res_light.b * specular_at_point.b;

			if (use_diffuse && (diffuse_at_point.r > CMP_EPSILON || diffuse_at_point.g > CMP_EPSILON || diffuse_at_point.b > CMP_EPSILON)) {
				//diffuse bounce

				Vector3 c1 = r_normal.cross(n).normalized();
				Vector3 c2 = r_normal.cross(c1).normalized();
				double r1 = double(rand()) / RAND_MAX;
				double r2 = double(rand()) / RAND_MAX;
				double r3 = double(rand()) / RAND_MAX;
#if 0
				Vector3 next = - ((c1*(r1-0.5)) + (c2*(r2-0.5)) + (r_normal*(r3-0.5))).normalized()*0.5 + r_normal*0.5;

				if (next==Vector3())
					next=r_normal;
				Vector3 rn=next.normalized();

#else
				Vector3 rn = ((c1 * (r1 - 0.5)) + (c2 * (r2 - 0.5)) + (r_normal * r3 * 0.5)).normalized();
#endif

				ret = _throw_ray(thread_stack, p_bake_direct, r_point, r_point + rn * p_rest, p_rest, diffuse_at_point, p_att_curve, p_att_pos, p_att_curve_len, p_bounces - 1);
			}

			if (use_specular && (specular_at_point.r > CMP_EPSILON || specular_at_point.g > CMP_EPSILON || specular_at_point.b > CMP_EPSILON)) {
				//specular bounce

				//Vector3 c1=r_normal.cross(n).normalized();
				//Vector3 c2=r_normal.cross(c1).normalized();

				Vector3 rn = n - r_normal * r_normal.dot(n) * 2.0;

				_throw_ray(thread_stack, p_bake_direct, r_point, r_point + rn * p_rest, p_rest, specular_at_point, p_att_curve, p_att_pos, p_att_curve_len, p_bounces - 1);
			}
		}

		//specular later
		//		_plot_light_point(r_point,octree,octree_aabb,p_light);

		Color plot_light = res_light.linear_interpolate(diffuse_at_point, tint);
		plot_light.r *= att;
		plot_light.g *= att;
		plot_light.b *= att;
		Color tint_light = diffuse_at_point;
		tint_light.r *= att;
		tint_light.g *= att;
		tint_light.b *= att;

		bool skip = false;

		if (!p_first_bounce || p_bake_direct) {

			float r = plot_size * cell_size * 2;
			if (dist < r) {
				//avoid accumulaiton of light on corners
				//plot_light=plot_light.linear_interpolate(Color(0,0,0,0),1.0-sd/plot_size*plot_size);
				skip = true;

			} else {

				Vector3 c1 = r_normal.cross(n).normalized();
				Vector3 c2 = r_normal.cross(c1).normalized();
				double r1 = double(rand()) / RAND_MAX;
				double r2 = double(rand()) / RAND_MAX;
				double r3 = double(rand()) / RAND_MAX;
				Vector3 rn = ((c1 * (r1 - 0.5)) + (c2 * (r2 - 0.5)) + (r_normal * r3 * 0.25)).normalized();
				float d = _throw_ray(thread_stack, p_bake_direct, r_point, r_point + rn * p_rest, p_rest, diffuse_at_point, p_att_curve, p_att_pos, p_att_curve_len, p_bounces - 1, false, true);
				r = plot_size * cell_size * ao_radius;
				if (d > 0 && d < r) {
					//avoid accumulaiton of light on corners
					//plot_light=plot_light.linear_interpolate(Color(0,0,0,0),1.0-sd/plot_size*plot_size);
					skip = true;

				} else {
					//plot_light=Color(0,0,0,0);
				}
			}
		}

		Plane plane(r_point, r_normal);
		if (!skip)
			_plot_light(thread_stack, r_point, aabb, plot_light, tint_light, !(!p_first_bounce || p_bake_direct), plane);

		return dist;
	}

	return -1;
}

void BakedLightBaker::_make_octree_texture() {

	BakedLightBaker::Octant *octants = octant_pool.ptr();

	//find neighbours first, to have a better idea of what amount of space is needed
	{

		Vector<OctantHash> octant_hashing;
		octant_hashing.resize(octant_pool_size);
		Vector<uint32_t> hash_table;
		int hash_table_size = Math::larger_prime(16384);
		hash_table.resize(hash_table_size);
		uint32_t *hashptr = hash_table.ptr();
		OctantHash *octhashptr = octant_hashing.ptr();

		for (int i = 0; i < hash_table_size; i++)
			hashptr[i] = 0;

		//step 1 add to hash table

		uint32_t oct_idx = leaf_list;

		while (oct_idx) {

			BakedLightBaker::Octant *oct = &octants[oct_idx];
			uint64_t base = 0;
			Vector3 pos = oct->aabb.pos - octree_aabb.pos; //make sure is always positive
			base = int((pos.x + cell_size * 0.5) / cell_size);
			base <<= 16;
			base |= int((pos.y + cell_size * 0.5) / cell_size);
			base <<= 16;
			base |= int((pos.z + cell_size * 0.5) / cell_size);

			uint32_t hash = HashMapHasherDefault::hash(base);
			uint32_t idx = hash % hash_table_size;
			octhashptr[oct_idx].next = hashptr[idx];
			octhashptr[oct_idx].hash = hash;
			octhashptr[oct_idx].value = base;
			hashptr[idx] = oct_idx;

			oct_idx = oct->next_leaf;
		}

		//step 2 find neighbours
		oct_idx = leaf_list;
		int neighbours = 0;

		while (oct_idx) {

			BakedLightBaker::Octant *oct = &octants[oct_idx];
			Vector3 pos = oct->aabb.pos - octree_aabb.pos; //make sure is always positive
			pos.x += cell_size;
			uint64_t base = 0;
			base = int((pos.x + cell_size * 0.5) / cell_size);
			base <<= 16;
			base |= int((pos.y + cell_size * 0.5) / cell_size);
			base <<= 16;
			base |= int((pos.z + cell_size * 0.5) / cell_size);

			uint32_t hash = HashMapHasherDefault::hash(base);
			uint32_t idx = hash % hash_table_size;

			uint32_t bucket = hashptr[idx];

			while (bucket) {

				if (octhashptr[bucket].value == base) {

					oct->bake_neighbour = bucket;
					octants[bucket].first_neighbour = false;
					neighbours++;
					break;
				}

				bucket = octhashptr[bucket].next;
			}

			oct_idx = oct->next_leaf;
		}

		print_line("octant with neighbour: " + itos(neighbours));
	}

	//ok let's try to just create a texture

	int otex_w = 256;

	while (true) {

		uint32_t oct_idx = leaf_list;

		int row = 0;

		print_line("begin at row " + itos(row));
		int longest_line_reused = 0;
		int col = 0;
		int processed = 0;

		//reset
		while (oct_idx) {

			BakedLightBaker::Octant *oct = &octants[oct_idx];
			oct->texture_x = 0;
			oct->texture_y = 0;
			oct_idx = oct->next_leaf;
		}

		oct_idx = leaf_list;
		//assign
		while (oct_idx) {

			BakedLightBaker::Octant *oct = &octants[oct_idx];
			if (oct->first_neighbour && oct->texture_x == 0 && oct->texture_y == 0) {
				//was not processed
				uint32_t current_idx = oct_idx;
				int reused = 0;

				while (current_idx) {
					BakedLightBaker::Octant *o = &octants[current_idx];
					if (col + 1 >= otex_w) {
						col = 0;
						row += 4;
					}
					o->texture_x = col;
					o->texture_y = row;
					processed++;

					if (o->bake_neighbour) {
						reused++;
					}
					col += o->bake_neighbour ? 1 : 2; //reuse neighbour
					current_idx = o->bake_neighbour;
				}

				if (reused > longest_line_reused) {
					longest_line_reused = reused;
				}
			}
			oct_idx = oct->next_leaf;
		}

		row += 4;

		if (otex_w < row) {

			otex_w *= 2;
		} else {

			baked_light_texture_w = otex_w;
			baked_light_texture_h = next_power_of_2(row);
			print_line("w: " + itos(otex_w));
			print_line("h: " + itos(row));
			break;
		}
	}

	{

		otex_w = (1 << lattice_size) * (1 << lattice_size) * 2; //make sure lattice fits horizontally
		Vector3 lattice_cell_size = octree_aabb.size;
		for (int i = 0; i < lattice_size; i++) {

			lattice_cell_size *= 0.5;
		}

		while (true) {

			//let's plot the leafs first, given the octree is not so obvious which size it will have
			int row = 4 + 4 * (1 << lattice_size);
			int col = 0;

			col = 0;
			row += 4;
			print_line("end at row " + itos(row));

			//put octree, no need for recursion, just loop backwards.
			int regular_octants = 0;
			for (int i = octant_pool_size - 1; i >= 0; i--) {

				BakedLightBaker::Octant *oct = &octants[i];
				if (oct->leaf) //ignore leaf
					continue;
				if (oct->aabb.size.x > lattice_cell_size.x * 1.1) { //bigger than latice, skip
					oct->texture_x = 0;
					oct->texture_y = 0;
				} else if (oct->aabb.size.x > lattice_cell_size.x * 0.8) {
					//this is the initial lattice
					Vector3 pos = oct->aabb.pos - octree_aabb.pos; //make sure is always positive
					int x = int((pos.x + lattice_cell_size.x * 0.5) / lattice_cell_size.x);
					int y = int((pos.y + lattice_cell_size.y * 0.5) / lattice_cell_size.y);
					int z = int((pos.z + lattice_cell_size.z * 0.5) / lattice_cell_size.z);
					//bug net
					ERR_FAIL_INDEX(x, (1 << lattice_size));
					ERR_FAIL_INDEX(y, (1 << lattice_size));
					ERR_FAIL_INDEX(z, (1 << lattice_size));

					/*int ofs = z*(1<<lattice_size)*(1<<lattice_size)+y*(1<<lattice_size)+x;
					ofs*=4;
					oct->texture_x=ofs%otex_w;
					oct->texture_y=(ofs/otex_w)*4+4;
					*/

					oct->texture_x = (x + (1 << lattice_size) * z) * 2;
					oct->texture_y = 4 + y * 4;
					//print_line("pos: "+itos(x)+","+itos(y)+","+itos(z)+" -  ofs"+itos(oct->texture_x)+","+itos(oct->texture_y));

				} else {
					//an everyday regular octant

					if (col + 2 > otex_w) {
						col = 0;
						row += 4;
					}

					oct->texture_x = col;
					oct->texture_y = row;
					col += 2;
					regular_octants++;
				}
			}
			print_line("octants end at row " + itos(row) + " totalling" + itos(regular_octants));

			//ok evaluation.

			if (otex_w <= 2048 && row > 2048) { //too big upwards, try bigger texture
				otex_w *= 2;
				continue;
			} else {
				baked_octree_texture_w = otex_w;
				baked_octree_texture_h = row + 4;
				break;
			}
		}
	}

	baked_octree_texture_h = next_power_of_2(baked_octree_texture_h);
	print_line("RESULT! " + itos(baked_octree_texture_w) + "," + itos(baked_octree_texture_h));
}

double BakedLightBaker::get_normalization(int p_light_idx) const {

	double nrg = 0;

	const LightData &dl = lights[p_light_idx];
	double cell_area = cell_size * cell_size;
	//nrg+= /*dl.energy */ (dl.rays_thrown * cell_area / dl.area);
	nrg = dl.rays_thrown * cell_area;
	nrg *= (Math_PI * plot_size * plot_size) * 0.5; // damping of radial linear gradient kernel
	nrg *= dl.constant;
	//nrg*=5;

	return nrg;
}

double BakedLightBaker::get_modifier(int p_light_idx) const {

	double nrg = 0;

	const LightData &dl = lights[p_light_idx];
	double cell_area = cell_size * cell_size;
	//nrg+= /*dl.energy */ (dl.rays_thrown * cell_area / dl.area);
	nrg = cell_area;
	nrg *= (Math_PI * plot_size * plot_size) * 0.5; // damping of radial linear gradient kernel
	nrg *= dl.constant;
	//nrg*=5;

	return nrg;
}

void BakedLightBaker::throw_rays(ThreadStack &thread_stack, int p_amount) {

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

		LightData &dl = lights[i];

		int amount = p_amount * total_light_area / dl.area;
		double mod = 1.0 / double(get_modifier(i));
		mod *= p_amount / float(amount);

		switch (dl.type) {

			case VS::LIGHT_DIRECTIONAL: {

				for (int j = 0; j < amount; j++) {
					Vector3 from = dl.pos;
					double r1 = double(rand()) / RAND_MAX;
					double r2 = double(rand()) / RAND_MAX;
					from += dl.up * (r1 * 2.0 - 1.0);
					from += dl.left * (r2 * 2.0 - 1.0);
					Vector3 to = from + dl.dir * dl.length;
					Color col = dl.diffuse;
					float m = mod * dl.energy;
					col.r *= m;
					col.g *= m;
					col.b *= m;

					dl.rays_thrown++;
					baked_light_baker_add_64i(&total_rays, 1);

					_throw_ray(thread_stack, dl.bake_direct, from, to, dl.length, col, NULL, 0, 0, max_bounces, true);
				}
			} break;
			case VS::LIGHT_OMNI: {

				for (int j = 0; j < amount; j++) {
					Vector3 from = dl.pos;

					double r1 = double(rand()) / RAND_MAX;
					double r2 = double(rand()) / RAND_MAX;
					double r3 = double(rand()) / RAND_MAX;

#if 0
					//crap is not uniform..
					Vector3 dir = Vector3(r1*2.0-1.0,r2*2.0-1.0,r3*2.0-1.0).normalized();

#else

					double phi = r1 * Math_PI * 2.0;
					double costheta = r2 * 2.0 - 1.0;
					double u = r3;

					double theta = acos(costheta);
					double r = 1.0 * pow(u, 1 / 3.0);

					Vector3 dir(
							r * sin(theta) * cos(phi),
							r * sin(theta) * sin(phi),
							r * cos(theta));
					dir.normalize();

#endif
					Vector3 to = dl.pos + dir * dl.radius;
					Color col = dl.diffuse;
					float m = mod * dl.energy;
					col.r *= m;
					col.g *= m;
					col.b *= m;

					dl.rays_thrown++;
					baked_light_baker_add_64i(&total_rays, 1);
					_throw_ray(thread_stack, dl.bake_direct, from, to, dl.radius, col, dl.attenuation_table.ptr(), 0, dl.radius, max_bounces, true);
					//					_throw_ray(i,from,to,dl.radius,col,NULL,0,dl.radius,max_bounces,true);
				}

			} break;
			case VS::LIGHT_SPOT: {

				for (int j = 0; j < amount; j++) {
					Vector3 from = dl.pos;

					double r1 = double(rand()) / RAND_MAX;
					//double r2 = double(rand())/RAND_MAX;
					double r3 = double(rand()) / RAND_MAX;

					float d = Math::tan(Math::deg2rad(dl.spot_angle));

					float x = sin(r1 * Math_PI * 2.0) * d;
					float y = cos(r1 * Math_PI * 2.0) * d;

					Vector3 dir = r3 * (dl.dir + dl.up * y + dl.left * x) + (1.0 - r3) * dl.dir;
					dir.normalize();

					Vector3 to = dl.pos + dir * dl.radius;
					Color col = dl.diffuse;
					float m = mod * dl.energy;
					col.r *= m;
					col.g *= m;
					col.b *= m;

					dl.rays_thrown++;
					baked_light_baker_add_64i(&total_rays, 1);
					_throw_ray(thread_stack, dl.bake_direct, from, to, dl.radius, col, dl.attenuation_table.ptr(), 0, dl.radius, max_bounces, true);
					//					_throw_ray(i,from,to,dl.radius,col,NULL,0,dl.radius,max_bounces,true);
				}

			} break;
		}
	}
}

void BakedLightBaker::bake(const Ref<BakedLight> &p_light, Node *p_node) {

	if (baking)
		return;
	cell_count = 0;

	base_inv = p_node->cast_to<Spatial>()->get_global_transform().affine_inverse();
	EditorProgress ep("bake", TTR("Light Baker Setup:"), 5);
	baked_light = p_light;
	lattice_size = baked_light->get_initial_lattice_subdiv();
	octree_depth = baked_light->get_cell_subdivision();
	plot_size = baked_light->get_plot_size();
	max_bounces = baked_light->get_bounces();
	use_diffuse = baked_light->get_bake_flag(BakedLight::BAKE_DIFFUSE);
	use_specular = baked_light->get_bake_flag(BakedLight::BAKE_SPECULAR);
	use_translucency = baked_light->get_bake_flag(BakedLight::BAKE_TRANSLUCENT);

	edge_damp = baked_light->get_edge_damp();
	normal_damp = baked_light->get_normal_damp();
	octree_extra_margin = baked_light->get_cell_extra_margin();
	tint = baked_light->get_tint();
	ao_radius = baked_light->get_ao_radius();
	ao_strength = baked_light->get_ao_strength();
	linear_color = baked_light->get_bake_flag(BakedLight::BAKE_LINEAR_COLOR);

	baked_textures.clear();
	for (int i = 0; i < baked_light->get_lightmaps_count(); i++) {
		BakeTexture bt;
		bt.width = baked_light->get_lightmap_gen_size(i).x;
		bt.height = baked_light->get_lightmap_gen_size(i).y;
		baked_textures.push_back(bt);
	}

	ep.step(TTR("Parsing Geometry"), 0);
	_parse_geometry(p_node);
	mat_map.clear();
	tex_map.clear();
	print_line("\ttotal triangles: " + itos(triangles.size()));
	// no geometry
	if (triangles.size() == 0) {
		return;
	}
	ep.step(TTR("Fixing Lights"), 1);
	_fix_lights();
	ep.step(TTR("Making BVH"), 2);
	_make_bvh();
	ep.step(TTR("Creating Light Octree"), 3);
	_make_octree();
	ep.step(TTR("Creating Octree Texture"), 4);
	_make_octree_texture();
	baking = true;
	_start_thread();
}

void BakedLightBaker::update_octree_sampler(DVector<int> &p_sampler) {

	BakedLightBaker::Octant *octants = octant_pool.ptr();
	double norm = 1.0 / double(total_rays);

	if (p_sampler.size() == 0 || first_bake_to_map) {

		Vector<int> tmp_smp;
		tmp_smp.resize(32); //32 for header

		for (int i = 0; i < 32; i++) {
			tmp_smp[i] = 0;
		}

		for (int i = octant_pool_size - 1; i >= 0; i--) {

			if (i == 0)
				tmp_smp[1] = tmp_smp.size();

			Octant &octant = octants[i];
			octant.sampler_ofs = tmp_smp.size();
			int idxcol[2] = { 0, 0 };

			int r = CLAMP((octant.full_accum[0] * norm) * 2048, 0, 32767);
			int g = CLAMP((octant.full_accum[1] * norm) * 2048, 0, 32767);
			int b = CLAMP((octant.full_accum[2] * norm) * 2048, 0, 32767);

			idxcol[0] |= r;
			idxcol[1] |= (g << 16) | b;

			if (octant.leaf) {
				tmp_smp.push_back(idxcol[0]);
				tmp_smp.push_back(idxcol[1]);
			} else {

				for (int j = 0; j < 8; j++) {
					if (octant.children[j]) {
						idxcol[0] |= (1 << (j + 16));
					}
				}
				tmp_smp.push_back(idxcol[0]);
				tmp_smp.push_back(idxcol[1]);
				for (int j = 0; j < 8; j++) {
					if (octant.children[j]) {
						tmp_smp.push_back(octants[octant.children[j]].sampler_ofs);
						if (octants[octant.children[j]].sampler_ofs == 0) {
							print_line("FUUUUUUUUCK");
						}
					}
				}
			}
		}

		p_sampler.resize(tmp_smp.size());
		DVector<int>::Write w = p_sampler.write();
		int ss = tmp_smp.size();
		for (int i = 0; i < ss; i++) {
			w[i] = tmp_smp[i];
		}

		first_bake_to_map = false;
	}

	double gamma = baked_light->get_gamma_adjust();
	double mult = baked_light->get_energy_multiplier();
	float saturation = baked_light->get_saturation();

	DVector<int>::Write w = p_sampler.write();

	encode_uint32(octree_depth, (uint8_t *)&w[2]);
	encode_uint32(linear_color, (uint8_t *)&w[3]);

	encode_float(octree_aabb.pos.x, (uint8_t *)&w[4]);
	encode_float(octree_aabb.pos.y, (uint8_t *)&w[5]);
	encode_float(octree_aabb.pos.z, (uint8_t *)&w[6]);
	encode_float(octree_aabb.size.x, (uint8_t *)&w[7]);
	encode_float(octree_aabb.size.y, (uint8_t *)&w[8]);
	encode_float(octree_aabb.size.z, (uint8_t *)&w[9]);

	//norm*=multiplier;

	for (int i = octant_pool_size - 1; i >= 0; i--) {

		Octant &octant = octants[i];
		int idxcol[2] = { w[octant.sampler_ofs], w[octant.sampler_ofs + 1] };

		double rf = pow(octant.full_accum[0] * norm * mult, gamma);
		double gf = pow(octant.full_accum[1] * norm * mult, gamma);
		double bf = pow(octant.full_accum[2] * norm * mult, gamma);

		double gray = (rf + gf + bf) / 3.0;
		rf = gray + (rf - gray) * saturation;
		gf = gray + (gf - gray) * saturation;
		bf = gray + (bf - gray) * saturation;

		int r = CLAMP((rf)*2048, 0, 32767);
		int g = CLAMP((gf)*2048, 0, 32767);
		int b = CLAMP((bf)*2048, 0, 32767);

		idxcol[0] = ((idxcol[0] >> 16) << 16) | r;
		idxcol[1] = (g << 16) | b;
		w[octant.sampler_ofs] = idxcol[0];
		w[octant.sampler_ofs + 1] = idxcol[1];
	}
}

void BakedLightBaker::update_octree_images(DVector<uint8_t> &p_octree, DVector<uint8_t> &p_light) {

	int len = baked_octree_texture_w * baked_octree_texture_h * 4;
	p_octree.resize(len);

	int ilen = baked_light_texture_w * baked_light_texture_h * 4;
	p_light.resize(ilen);

	DVector<uint8_t>::Write w = p_octree.write();
	zeromem(w.ptr(), len);

	DVector<uint8_t>::Write iw = p_light.write();
	zeromem(iw.ptr(), ilen);

	float gamma = baked_light->get_gamma_adjust();
	float mult = baked_light->get_energy_multiplier();

	for (int i = 0; i < len; i += 4) {
		w[i + 0] = 0xFF;
		w[i + 1] = 0;
		w[i + 2] = 0xFF;
		w[i + 3] = 0xFF;
	}

	for (int i = 0; i < ilen; i += 4) {
		iw[i + 0] = 0xFF;
		iw[i + 1] = 0;
		iw[i + 2] = 0xFF;
		iw[i + 3] = 0xFF;
	}

	float multiplier = 1.0;

	if (baked_light->get_format() == BakedLight::FORMAT_HDR8)
		multiplier = 8;
	encode_uint32(baked_octree_texture_w, &w[0]);
	encode_uint32(baked_octree_texture_h, &w[4]);
	encode_uint32(0, &w[8]);
	encode_float(1 << lattice_size, &w[12]);
	encode_uint32(octree_depth - lattice_size, &w[16]);
	encode_uint32(multiplier, &w[20]);
	encode_uint16(baked_light_texture_w, &w[24]); //if present, use the baked light texture
	encode_uint16(baked_light_texture_h, &w[26]);
	encode_uint32(0, &w[28]); //baked light texture format

	encode_float(octree_aabb.pos.x, &w[32]);
	encode_float(octree_aabb.pos.y, &w[36]);
	encode_float(octree_aabb.pos.z, &w[40]);
	encode_float(octree_aabb.size.x, &w[44]);
	encode_float(octree_aabb.size.y, &w[48]);
	encode_float(octree_aabb.size.z, &w[52]);

	BakedLightBaker::Octant *octants = octant_pool.ptr();
	int octant_count = octant_pool_size;
	uint8_t *ptr = w.ptr();
	uint8_t *lptr = iw.ptr();

	int child_offsets[8] = {
		0,
		4,
		baked_octree_texture_w * 4,
		baked_octree_texture_w * 4 + 4,
		baked_octree_texture_w * 8 + 0,
		baked_octree_texture_w * 8 + 4,
		baked_octree_texture_w * 8 + baked_octree_texture_w * 4,
		baked_octree_texture_w * 8 + baked_octree_texture_w * 4 + 4,
	};

	int lchild_offsets[8] = {
		0,
		4,
		baked_light_texture_w * 4,
		baked_light_texture_w * 4 + 4,
		baked_light_texture_w * 8 + 0,
		baked_light_texture_w * 8 + 4,
		baked_light_texture_w * 8 + baked_light_texture_w * 4,
		baked_light_texture_w * 8 + baked_light_texture_w * 4 + 4,
	};

	/*Vector<double> norm_arr;
	norm_arr.resize(lights.size());

	for(int i=0;i<lights.size();i++) {
		norm_arr[i] =  1.0/get_normalization(i);
	}

	const double *normptr=norm_arr.ptr();
*/
	double norm = 1.0 / double(total_rays);
	mult /= multiplier;
	double saturation = baked_light->get_saturation();

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

		Octant &oct = octants[i];
		if (oct.texture_x == 0 && oct.texture_y == 0)
			continue;

		if (oct.leaf) {

			int ofs = (oct.texture_y * baked_light_texture_w + oct.texture_x) << 2;
			ERR_CONTINUE(ofs < 0 || ofs > ilen);
			//write colors
			for (int j = 0; j < 8; j++) {

				//if (!oct.children[j])
				//	continue;
				uint8_t *iptr = &lptr[ofs + lchild_offsets[j]];

				float r = oct.light_accum[j][0] * norm;
				float g = oct.light_accum[j][1] * norm;
				float b = oct.light_accum[j][2] * norm;

				r = pow(r * mult, gamma);
				g = pow(g * mult, gamma);
				b = pow(b * mult, gamma);

				double gray = (r + g + b) / 3.0;
				r = gray + (r - gray) * saturation;
				g = gray + (g - gray) * saturation;
				b = gray + (b - gray) * saturation;

				float ic[3] = {
					r,
					g,
					b,
				};
				iptr[0] = CLAMP(ic[0] * 255.0, 0, 255);
				iptr[1] = CLAMP(ic[1] * 255.0, 0, 255);
				iptr[2] = CLAMP(ic[2] * 255.0, 0, 255);
				iptr[3] = 255;
			}

		} else {

			int ofs = (oct.texture_y * baked_octree_texture_w + oct.texture_x) << 2;
			ERR_CONTINUE(ofs < 0 || ofs > len);

			//write indices
			for (int j = 0; j < 8; j++) {

				if (!oct.children[j])
					continue;
				Octant &choct = octants[oct.children[j]];
				uint8_t *iptr = &ptr[ofs + child_offsets[j]];

				iptr[0] = choct.texture_x >> 8;
				iptr[1] = choct.texture_x & 0xFF;
				iptr[2] = choct.texture_y >> 8;
				iptr[3] = choct.texture_y & 0xFF;
			}
		}
	}
}

void BakedLightBaker::_free_bvh(BVH *p_bvh) {

	if (!p_bvh->leaf) {
		if (p_bvh->children[0])
			_free_bvh(p_bvh->children[0]);
		if (p_bvh->children[1])
			_free_bvh(p_bvh->children[1]);
	}

	memdelete(p_bvh);
}

bool BakedLightBaker::is_baking() {

	return baking;
}

void BakedLightBaker::set_pause(bool p_pause) {

	if (paused == p_pause)
		return;

	paused = p_pause;

	if (paused) {
		_stop_thread();
	} else {
		_start_thread();
	}
}
bool BakedLightBaker::is_paused() {

	return paused;
}

void BakedLightBaker::_bake_thread_func(void *arg) {

	BakedLightBaker *ble = (BakedLightBaker *)arg;

	ThreadStack thread_stack;

	thread_stack.ray_stack = memnew_arr(uint32_t, ble->bvh_depth);
	thread_stack.bvh_stack = memnew_arr(BVH *, ble->bvh_depth);
	thread_stack.octant_stack = memnew_arr(uint32_t, ble->octree_depth * 2);
	thread_stack.octantptr_stack = memnew_arr(uint32_t, ble->octree_depth * 2);

	while (!ble->bake_thread_exit) {

		ble->throw_rays(thread_stack, 1000);
	}

	memdelete_arr(thread_stack.ray_stack);
	memdelete_arr(thread_stack.bvh_stack);
	memdelete_arr(thread_stack.octant_stack);
	memdelete_arr(thread_stack.octantptr_stack);
}

void BakedLightBaker::_start_thread() {

	if (threads.size() != 0)
		return;
	bake_thread_exit = false;

	int thread_count = EDITOR_DEF("light_baker/custom_bake_threads", 0);
	if (thread_count <= 0 || thread_count > 64)
		thread_count = OS::get_singleton()->get_processor_count();

	//thread_count=1;
	threads.resize(thread_count);
	for (int i = 0; i < threads.size(); i++) {
		threads[i] = Thread::create(_bake_thread_func, this);
	}
}

void BakedLightBaker::_stop_thread() {

	if (threads.size() == 0)
		return;
	bake_thread_exit = true;
	for (int i = 0; i < threads.size(); i++) {
		Thread::wait_to_finish(threads[i]);
		memdelete(threads[i]);
	}
	threads.clear();
}

void BakedLightBaker::_plot_pixel_to_lightmap(int x, int y, int width, int height, uint8_t *image, const Vector3 &p_pos, const Vector3 &p_normal, double *p_norm_ptr, float mult, float gamma) {

	uint8_t *ptr = &image[(y * width + x) * 4];
	//int lc = lights.size();
	double norm = 1.0 / double(total_rays);

	Color color;

	Octant *octants = octant_pool.ptr();

	int octant_idx = 0;

	while (true) {

		Octant &octant = octants[octant_idx];

		if (octant.leaf) {

			Vector3 lpos = p_pos - octant.aabb.pos;
			lpos /= octant.aabb.size;

			Vector3 cols[8];

			for (int i = 0; i < 8; i++) {

				cols[i].x += octant.light_accum[i][0] * norm;
				cols[i].y += octant.light_accum[i][1] * norm;
				cols[i].z += octant.light_accum[i][2] * norm;
			}

			/*Vector3 final = (cols[0] + (cols[1] - cols[0]) * lpos.y);
			final = final + ((cols[2] + (cols[3] - cols[2]) * lpos.y) - final)*lpos.x;

			Vector3 final2 = (cols[4+0] + (cols[4+1] - cols[4+0]) * lpos.y);
			final2 = final2 + ((cols[4+2] + (cols[4+3] - cols[4+2]) * lpos.y) - final2)*lpos.x;*/

			Vector3 finala = cols[0].linear_interpolate(cols[1], lpos.x);
			Vector3 finalb = cols[2].linear_interpolate(cols[3], lpos.x);
			Vector3 final = finala.linear_interpolate(finalb, lpos.y);

			Vector3 final2a = cols[4 + 0].linear_interpolate(cols[4 + 1], lpos.x);
			Vector3 final2b = cols[4 + 2].linear_interpolate(cols[4 + 3], lpos.x);
			Vector3 final2 = final2a.linear_interpolate(final2b, lpos.y);

			final = final.linear_interpolate(final2, lpos.z);
			if (baked_light->get_format() == BakedLight::FORMAT_HDR8)
				final *= 8.0;

			color.r = pow(final.x * mult, gamma);
			color.g = pow(final.y * mult, gamma);
			color.b = pow(final.z * mult, gamma);
			color.a = 1.0;

			int lc = lights.size();
			LightData *lv = lights.ptr();
			for (int i = 0; i < lc; i++) {
				//shadow baking
				if (!lv[i].bake_shadow)
					continue;
				Vector3 from = p_pos + p_normal * 0.01;
				Vector3 to;
				float att = 0;
				switch (lv[i].type) {
					case VS::LIGHT_DIRECTIONAL: {
						to = from - lv[i].dir * lv[i].length;
					} break;
					case VS::LIGHT_OMNI: {
						to = lv[i].pos;
						float d = MIN(lv[i].radius, to.distance_to(from)) / lv[i].radius;
						att = d; //1.0-d;
					} break;
					default: continue;
				}

				uint32_t *stack = ray_stack;
				BVH **bstack = bvh_stack;

				enum {
					TEST_RAY_BIT = 0,
					VISIT_LEFT_BIT = 1,
					VISIT_RIGHT_BIT = 2,
					VISIT_DONE_BIT = 3,

				};

				bool intersected = false;

				int level = 0;

				Vector3 n = (to - from);
				float len = n.length();
				if (len == 0)
					continue;
				n /= len;

				bstack[0] = bvh;
				stack[0] = TEST_RAY_BIT;

				while (!intersected) {

					uint32_t mode = stack[level];
					const BVH &b = *bstack[level];
					bool done = false;

					switch (mode) {
						case TEST_RAY_BIT: {

							if (b.leaf) {

								Face3 f3(b.leaf->vertices[0], b.leaf->vertices[1], b.leaf->vertices[2]);

								Vector3 res;

								if (f3.intersects_segment(from, to)) {
									intersected = true;
									done = true;
								}

								stack[level] = VISIT_DONE_BIT;
							} else {

								bool valid = b.aabb.smits_intersect_ray(from, n, 0, len);
								//bool valid = b.aabb.intersects_segment(p_begin,p_end);
								//				bool valid = b.aabb.intersects(ray_aabb);

								if (!valid) {

									stack[level] = VISIT_DONE_BIT;

								} else {

									stack[level] = VISIT_LEFT_BIT;
								}
							}
						}
							continue;
						case VISIT_LEFT_BIT: {

							stack[level] = VISIT_RIGHT_BIT;
							bstack[level + 1] = b.children[0];
							stack[level + 1] = TEST_RAY_BIT;
							level++;
						}
							continue;
						case VISIT_RIGHT_BIT: {

							stack[level] = VISIT_DONE_BIT;
							bstack[level + 1] = b.children[1];
							stack[level + 1] = TEST_RAY_BIT;
							level++;
						}
							continue;
						case VISIT_DONE_BIT: {

							if (level == 0) {
								done = true;
								break;
							} else
								level--;
						}
							continue;
					}

					if (done)
						break;
				}

				if (intersected) {

					color.a = Math::lerp(MAX(0.01, lv[i].darkening), 1.0, att);
				}
			}

			break;
		} else {

			Vector3 lpos = p_pos - octant.aabb.pos;
			Vector3 half = octant.aabb.size * 0.5;

			int ofs = 0;

			if (lpos.x >= half.x)
				ofs |= 1;
			if (lpos.y >= half.y)
				ofs |= 2;
			if (lpos.z >= half.z)
				ofs |= 4;

			octant_idx = octant.children[ofs];

			if (octant_idx == 0)
				return;
		}
	}

	ptr[0] = CLAMP(color.r * 255.0, 0, 255);
	ptr[1] = CLAMP(color.g * 255.0, 0, 255);
	ptr[2] = CLAMP(color.b * 255.0, 0, 255);
	ptr[3] = CLAMP(color.a * 255.0, 0, 255);
}

Error BakedLightBaker::transfer_to_lightmaps() {

	if (!triangles.size() || baked_textures.size() == 0)
		return ERR_UNCONFIGURED;

	EditorProgress ep("transfer_to_lightmaps", TTR("Transfer to Lightmaps:"), baked_textures.size() * 2 + triangles.size());

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

		ERR_FAIL_COND_V(baked_textures[i].width <= 0 || baked_textures[i].height <= 0, ERR_UNCONFIGURED);

		baked_textures[i].data.resize(baked_textures[i].width * baked_textures[i].height * 4);
		zeromem(baked_textures[i].data.ptr(), baked_textures[i].data.size());
		ep.step(TTR("Allocating Texture #") + itos(i + 1), i);
	}

	Vector<double> norm_arr;
	norm_arr.resize(lights.size());

	for (int i = 0; i < lights.size(); i++) {
		norm_arr[i] = 1.0 / get_normalization(i);
	}
	float gamma = baked_light->get_gamma_adjust();
	float mult = baked_light->get_energy_multiplier();

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

		if (i % 200 == 0) {
			ep.step(TTR("Baking Triangle #") + itos(i), i + baked_textures.size());
		}
		Triangle &t = triangles[i];
		if (t.baked_texture < 0 || t.baked_texture >= baked_textures.size())
			continue;

		BakeTexture &bt = baked_textures[t.baked_texture];
		Vector3 normal = Plane(t.vertices[0], t.vertices[1], t.vertices[2]).normal;

		int x[3];
		int y[3];

		Vector3 vertices[3] = {
			t.vertices[0],
			t.vertices[1],
			t.vertices[2]
		};

		for (int j = 0; j < 3; j++) {

			x[j] = t.bake_uvs[j].x * bt.width;
			y[j] = t.bake_uvs[j].y * bt.height;
			x[j] = CLAMP(x[j], 0, bt.width - 1);
			y[j] = CLAMP(y[j], 0, bt.height - 1);
		}

		{

			// sort the points vertically
			if (y[1] > y[2]) {
				SWAP(x[1], x[2]);
				SWAP(y[1], y[2]);
				SWAP(vertices[1], vertices[2]);
			}
			if (y[0] > y[1]) {
				SWAP(x[0], x[1]);
				SWAP(y[0], y[1]);
				SWAP(vertices[0], vertices[1]);
			}
			if (y[1] > y[2]) {
				SWAP(x[1], x[2]);
				SWAP(y[1], y[2]);
				SWAP(vertices[1], vertices[2]);
			}

			double dx_far = double(x[2] - x[0]) / (y[2] - y[0] + 1);
			double dx_upper = double(x[1] - x[0]) / (y[1] - y[0] + 1);
			double dx_low = double(x[2] - x[1]) / (y[2] - y[1] + 1);
			double xf = x[0];
			double xt = x[0] + dx_upper; // if y[0] == y[1], special case
			for (int yi = y[0]; yi <= (y[2] > bt.height - 1 ? bt.height - 1 : y[2]); yi++) {
				if (yi >= 0) {
					for (int xi = (xf > 0 ? int(xf) : 0); xi <= (xt < bt.width ? xt : bt.width - 1); xi++) {
						//pixels[int(x + y * width)] = color;

						Vector2 v0 = Vector2(x[1] - x[0], y[1] - y[0]);
						Vector2 v1 = Vector2(x[2] - x[0], y[2] - y[0]);
						//vertices[2] - vertices[0];
						Vector2 v2 = Vector2(xi - x[0], yi - y[0]);
						float d00 = v0.dot(v0);
						float d01 = v0.dot(v1);
						float d11 = v1.dot(v1);
						float d20 = v2.dot(v0);
						float d21 = v2.dot(v1);
						float denom = (d00 * d11 - d01 * d01);
						Vector3 pos;
						if (denom == 0) {
							pos = t.vertices[0];
						} else {
							float v = (d11 * d20 - d01 * d21) / denom;
							float w = (d00 * d21 - d01 * d20) / denom;
							float u = 1.0f - v - w;
							pos = vertices[0] * u + vertices[1] * v + vertices[2] * w;
						}
						_plot_pixel_to_lightmap(xi, yi, bt.width, bt.height, bt.data.ptr(), pos, normal, norm_arr.ptr(), mult, gamma);
					}

					for (int xi = (xf < bt.width ? int(xf) : bt.width - 1); xi >= (xt > 0 ? xt : 0); xi--) {
						//pixels[int(x + y * width)] = color;
						Vector2 v0 = Vector2(x[1] - x[0], y[1] - y[0]);
						Vector2 v1 = Vector2(x[2] - x[0], y[2] - y[0]);
						//vertices[2] - vertices[0];
						Vector2 v2 = Vector2(xi - x[0], yi - y[0]);
						float d00 = v0.dot(v0);
						float d01 = v0.dot(v1);
						float d11 = v1.dot(v1);
						float d20 = v2.dot(v0);
						float d21 = v2.dot(v1);
						float denom = (d00 * d11 - d01 * d01);
						Vector3 pos;
						if (denom == 0) {
							pos = t.vertices[0];
						} else {
							float v = (d11 * d20 - d01 * d21) / denom;
							float w = (d00 * d21 - d01 * d20) / denom;
							float u = 1.0f - v - w;
							pos = vertices[0] * u + vertices[1] * v + vertices[2] * w;
						}

						_plot_pixel_to_lightmap(xi, yi, bt.width, bt.height, bt.data.ptr(), pos, normal, norm_arr.ptr(), mult, gamma);
					}
				}
				xf += dx_far;
				if (yi < y[1])
					xt += dx_upper;
				else
					xt += dx_low;
			}
		}
	}

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

		{

			ep.step(TTR("Post-Processing Texture #") + itos(i), i + baked_textures.size() + triangles.size());

			BakeTexture &bt = baked_textures[i];

			Vector<uint8_t> copy_data = bt.data;
			uint8_t *data = bt.data.ptr();
			const int max_radius = 8;
			const int shadow_radius = 2;
			const int max_dist = 0x7FFFFFFF;

			for (int x = 0; x < bt.width; x++) {

				for (int y = 0; y < bt.height; y++) {

					uint8_t a = copy_data[(y * bt.width + x) * 4 + 3];

					if (a > 0) {
						//blur shadow

						int from_x = MAX(0, x - shadow_radius);
						int to_x = MIN(bt.width - 1, x + shadow_radius);
						int from_y = MAX(0, y - shadow_radius);
						int to_y = MIN(bt.height - 1, y + shadow_radius);

						int sum = 0;
						int sumc = 0;

						for (int k = from_y; k <= to_y; k++) {
							for (int l = from_x; l <= to_x; l++) {

								const uint8_t *rp = &copy_data[(k * bt.width + l) << 2];

								sum += rp[3];
								sumc++;
							}
						}

						sum /= sumc;
						data[(y * bt.width + x) * 4 + 3] = sum;

					} else {

						int closest_dist = max_dist;
						uint8_t closest_color[4];

						int from_x = MAX(0, x - max_radius);
						int to_x = MIN(bt.width - 1, x + max_radius);
						int from_y = MAX(0, y - max_radius);
						int to_y = MIN(bt.height - 1, y + max_radius);

						for (int k = from_y; k <= to_y; k++) {
							for (int l = from_x; l <= to_x; l++) {

								int dy = y - k;
								int dx = x - l;
								int dist = dy * dy + dx * dx;
								if (dist >= closest_dist)
									continue;

								const uint8_t *rp = &copy_data[(k * bt.width + l) << 2];

								if (rp[3] == 0)
									continue;

								closest_dist = dist;
								closest_color[0] = rp[0];
								closest_color[1] = rp[1];
								closest_color[2] = rp[2];
								closest_color[3] = rp[3];
							}
						}

						if (closest_dist != max_dist) {

							data[(y * bt.width + x) * 4 + 0] = closest_color[0];
							data[(y * bt.width + x) * 4 + 1] = closest_color[1];
							data[(y * bt.width + x) * 4 + 2] = closest_color[2];
							data[(y * bt.width + x) * 4 + 3] = closest_color[3];
						}
					}
				}
			}
		}

		DVector<uint8_t> dv;
		dv.resize(baked_textures[i].data.size());
		{
			DVector<uint8_t>::Write w = dv.write();
			copymem(w.ptr(), baked_textures[i].data.ptr(), baked_textures[i].data.size());
		}

		Image img(baked_textures[i].width, baked_textures[i].height, 0, Image::FORMAT_RGBA, dv);
		Ref<ImageTexture> tex = memnew(ImageTexture);
		tex->create_from_image(img);
		baked_light->set_lightmap_texture(i, tex);
	}

	return OK;
}

void BakedLightBaker::clear() {

	_stop_thread();

	if (bvh)
		_free_bvh(bvh);

	if (ray_stack)
		memdelete_arr(ray_stack);
	if (octant_stack)
		memdelete_arr(octant_stack);
	if (octantptr_stack)
		memdelete_arr(octantptr_stack);
	if (bvh_stack)
		memdelete_arr(bvh_stack);
	/*
 * ???
	for(int i=0;i<octant_pool.size();i++) {
		//if (octant_pool[i].leaf) {
		//	memdelete_arr( octant_pool[i].light );
		//}	Vector<double> norm_arr;
		//norm_arr.resize(lights.size());

		for(int i=0;i<lights.size();i++) {
			norm_arr[i] =  1.0/get_normalization(i);
		}

		const double *normptr=norm_arr.ptr();
	}
*/
	octant_pool.clear();
	octant_pool_size = 0;
	bvh = NULL;
	leaf_list = 0;
	cell_count = 0;
	ray_stack = NULL;
	octant_stack = NULL;
	octantptr_stack = NULL;
	bvh_stack = NULL;
	materials.clear();
	materials.clear();
	textures.clear();
	lights.clear();
	triangles.clear();
	endpoint_normal.clear();
	endpoint_normal_bits.clear();
	baked_octree_texture_w = 0;
	baked_octree_texture_h = 0;
	paused = false;
	baking = false;

	bake_thread_exit = false;
	first_bake_to_map = true;
	baked_light = Ref<BakedLight>();
	total_rays = 0;
}

BakedLightBaker::BakedLightBaker() {
	octree_depth = 9;
	lattice_size = 4;
	octant_pool.clear();
	octant_pool_size = 0;
	bvh = NULL;
	leaf_list = 0;
	cell_count = 0;
	ray_stack = NULL;
	bvh_stack = NULL;
	octant_stack = NULL;
	octantptr_stack = NULL;
	plot_size = 2.5;
	max_bounces = 2;
	materials.clear();
	baked_octree_texture_w = 0;
	baked_octree_texture_h = 0;
	paused = false;
	baking = false;

	bake_thread_exit = false;
	total_rays = 0;
	first_bake_to_map = true;
	linear_color = false;
}

BakedLightBaker::~BakedLightBaker() {

	clear();
}