godotengine
/
godot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
godot/tools/editor/plugins/baked_light_baker.cpp

1766 lines
38 KiB
C++
Raw Normal View History

Light Baker! -=-=-=-=-=-= -Support for lightmap baker, have fun figuring out how it works before tutorial is published.
2014-06-11 13:41:03 +00:00
#include "baked_light_baker.h"
#include <stdlib.h>
#include <cmath>
#include "io/marshalls.h"
#include "tools/editor/editor_node.h"
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);
}
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) {
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;
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);
mm.diffuse.tex=_get_mat_tex(fm->get_texture(FixedMaterial::PARAM_DIFFUSE));
mm.specular.color=fm->get_parameter(FixedMaterial::PARAM_SPECULAR);
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<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 (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;
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] ];
}
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;
if (read_uv) {
t.uvs[0]=uvr[ i*3+0 ];
t.uvs[1]=uvr[ i*3+1 ];
t.uvs[2]=uvr[ 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());
}
} 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);
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.radius=dl->get_parameter(DirectionalLight::PARAM_RADIUS);
dirl.bake_direct=dl->get_bake_mode()==Light::BAKE_MODE_FULL;
dirl.rays_thrown=0;
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,2.0);
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);
}
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;
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++;
int lz = lights.size();
child->light = memnew_arr(OctantLight,lz);
for(int li=0;li<lz;li++) {
for(int ci=0;ci<8;ci++) {
child->light[li].accum[ci][0]=0;
child->light[li].accum[ci][1]=0;
child->light[li].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;
}
}
}
} 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","Parsing "+itos(triangles.size())+" Triangles:",triangles.size());
for(int i=0;i<triangles.size();i++) {
_octree_insert(0,&triangles[i],octree_depth-1);
if ((i%1000)==0) {
ep.step("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;
}
}
oct_idx=oct->next_leaf;
}
}
}
void BakedLightBaker::_plot_light(int p_light_index, const Vector3& p_plot_pos, const AABB& p_plot_aabb, const Color& p_light, const Plane& p_plane) {
//stackless version
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 (octant.leaf) {
//if (p_plane.normal.dot(octant.aabb.get_support(p_plane.normal)) < p_plane.d-CMP_EPSILON) { //octants behind are no go
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 (d<=r) {
float intensity = 1.0 - (d/r)*(d/r); //not gauss but..
float damp = Math::abs(p_plane.normal.dot(Vector3(octant.normal_accum[i][0],octant.normal_accum[i][1],octant.normal_accum[i][2])));
intensity*=pow(damp,edge_damp);
//intensity*=1.0-Math::abs(p_plane.distance_to(pos))/(plot_size*cell_size);
octant.light[p_light_index].accum[i][0]+=p_light.r*intensity;
octant.light[p_light_index].accum[i][1]+=p_light.g*intensity;
octant.light[p_light_index].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(int p_light_index,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) {
uint32_t* stack = ray_stack;
BVH **bstack = 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);
const BVH *bvhptr = bvh;
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) {
//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)
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);
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);
}
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
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;
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;
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(p_light_index,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(p_light_index,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;
plot_light.r*=att;
plot_light.g*=att;
plot_light.b*=att;
if (!p_first_bounce) {
float r = plot_size * cell_size;
if (ret<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);
plot_light=Color(0,0,0,0);
}
}
if (!p_first_bounce || lights[p_light_index].bake_direct) {
Plane plane(r_point,r_normal);
//print_line(String(plot_light)+String(" ")+rtos(att));
_plot_light(p_light_index,r_point,aabb,plot_light,plane);
}
return dist;
}
return 0;
}
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 = HashMapHahserDefault::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 = HashMapHahserDefault::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=(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);
uint32_t oct_idx=leaf_list;
//untag
while(oct_idx) {
BakedLightBaker::Octant *oct = &octants[oct_idx];
//0,0 also means unprocessed
oct->texture_x=0;
oct->texture_y=0;
oct_idx=oct->next_leaf;
}
oct_idx=leaf_list;
print_line("begin at row "+itos(row));
int longest_line_reused=0;
int col=0;
int processed=0;
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;
}
print_line("processed "+itos(processed));
print_line("longest reused: "+itos(longest_line_reused));
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=nearest_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;
print_line("CS: "+rtos(cell_size));
return nrg;
}
void BakedLightBaker::throw_rays(int p_amount) {
for(int i=0;i<lights.size();i++) {
LightData &dl=lights[i];
int amount = p_amount * total_light_area / dl.area;
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;
col.r*=dl.energy;
col.g*=dl.energy;
col.b*=dl.energy;
dl.rays_thrown++;
total_rays++;
_throw_ray(i,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;
col.r*=dl.energy;
col.g*=dl.energy;
col.b*=dl.energy;
dl.rays_thrown++;
total_rays++;
_throw_ray(i,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;
col.r*=dl.energy;
col.g*=dl.energy;
col.b*=dl.energy;
dl.rays_thrown++;
total_rays++;
_throw_ray(i,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","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();
ep.step("Parsing Geometry",0);
_parse_geometry(p_node);
mat_map.clear();
tex_map.clear();
print_line("\ttotal triangles: "+itos(triangles.size()));
ep.step("Fixing Lights",1);
_fix_lights();
ep.step("Making BVH",2);
_make_bvh();
ep.step("Creating Light Octree",3);
_make_octree();
ep.step("Creating Octree Texture",4);
_make_octree_texture();
baking=true;
_start_thread();
}
void BakedLightBaker::update_octree_image(DVector<uint8_t> &p_image) {
int len = baked_octree_texture_w*baked_octree_texture_h*4;
p_image.resize(len);
DVector<uint8_t>::Write w = p_image.write();
zeromem(w.ptr(),len);
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;
}
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_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();
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,
};
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();
int lz=lights.size();
for(int i=0;i<octant_count;i++) {
Octant &oct=octants[i];
if (oct.texture_x==0 && oct.texture_y==0)
continue;
int ofs = (oct.texture_y * baked_octree_texture_w + oct.texture_x)<<2;
if (oct.leaf) {
//write colors
for(int j=0;j<8;j++) {
//if (!oct.children[j])
// continue;
uint8_t *iptr=&ptr[ofs+child_offsets[j]];
float r=0;
float g=0;
float b=0;
for(int k=0;k<lz;k++) {
r+=oct.light[k].accum[j][0]*normptr[k];
g+=oct.light[k].accum[j][1]*normptr[k];
b+=oct.light[k].accum[j][2]*normptr[k];
}
r=pow(r*mult,gamma);
g=pow(g*mult,gamma);
b=pow(b*mult,gamma);
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 {
//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;
ble->rays_at_snap_time=ble->total_rays;
ble->snap_time=OS::get_singleton()->get_ticks_usec();
while(!ble->bake_thread_exit) {
ble->throw_rays(1000);
uint64_t t=OS::get_singleton()->get_ticks_usec();
if (t-ble->snap_time>1000000) {
double time = (t-ble->snap_time)/1000000.0;
int rays=ble->total_rays-ble->rays_at_snap_time;
ble->rays_sec=int(rays/time);
ble->snap_time=OS::get_singleton()->get_ticks_usec();
ble->rays_at_snap_time=ble->total_rays;
}
}
}
void BakedLightBaker::_start_thread() {
if (thread!=NULL)
return;
bake_thread_exit=false;
thread=Thread::create(_bake_thread_func,this);
}
void BakedLightBaker::_stop_thread() {
if (thread==NULL)
return;
bake_thread_exit=true;
Thread::wait_to_finish(thread);
thread=NULL;
}
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 );
}
}
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();
baked_octree_texture_w=0;
baked_octree_texture_h=0;
paused=false;
baking=false;
thread=NULL;
bake_thread_exit=false;
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;
thread=NULL;
bake_thread_exit=false;
rays_at_snap_time=0;
snap_time=0;
rays_sec=0;
total_rays=0;
}
BakedLightBaker::~BakedLightBaker() {
clear();
}