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test2/source/blender/render/intern/source/occlusion.c

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/*
*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2008 Blender Foundation.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): Brecht Van Lommel.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/render/intern/source/occlusion.c
* \ingroup render
*/
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "MEM_guardedalloc.h"
#include "DNA_material_types.h"
#include "BLI_math.h"
#include "BLI_blenlib.h"
#include "BLI_memarena.h"
#include "BLI_threads.h"
#include "BLI_utildefines.h"
#include "BKE_global.h"
#include "BKE_scene.h"
#include "RE_shader_ext.h"
/* local includes */
#include "occlusion.h"
#include "render_types.h"
#include "rendercore.h"
#include "renderdatabase.h"
#include "pixelshading.h"
#include "shading.h"
#include "zbuf.h"
/* ------------------------- Declarations --------------------------- */
#define INVALID_INDEX ((int)(~0))
#define INVPI 0.31830988618379069f
#define TOTCHILD 8
#define CACHE_STEP 3
typedef struct OcclusionCacheSample {
float co[3], n[3], ao[3], env[3], indirect[3], intensity, dist2;
int x, y, filled;
} OcclusionCacheSample;
typedef struct OcclusionCache {
OcclusionCacheSample *sample;
int x, y, w, h, step;
} OcclusionCache;
typedef struct OccFace {
int obi;
int facenr;
} OccFace;
typedef struct OccNode {
float co[3], area;
float sh[9], dco;
float occlusion, rad[3];
int childflag;
union {
//OccFace face;
int face;
struct OccNode *node;
} child[TOTCHILD];
} OccNode;
typedef struct OcclusionTree {
MemArena *arena;
float (*co)[3]; /* temporary during build */
OccFace *face; /* instance and face indices */
float *occlusion; /* occlusion for faces */
float (*rad)[3]; /* radiance for faces */
OccNode *root;
OccNode **stack[BLENDER_MAX_THREADS];
int maxdepth;
int totface;
float error;
float distfac;
int dothreadedbuild;
int totbuildthread;
int doindirect;
OcclusionCache *cache;
} OcclusionTree;
typedef struct OcclusionThread {
Render *re;
StrandSurface *mesh;
float (*faceao)[3];
float (*faceenv)[3];
float (*faceindirect)[3];
int begin, end;
int thread;
} OcclusionThread;
typedef struct OcclusionBuildThread {
OcclusionTree *tree;
int begin, end, depth;
OccNode *node;
} OcclusionBuildThread;
/* ------------------------- Shading --------------------------- */
extern Render R; // meh
static void occ_shade(ShadeSample *ssamp, ObjectInstanceRen *obi, VlakRen *vlr, float *rad)
{
ShadeInput *shi= ssamp->shi;
ShadeResult *shr= ssamp->shr;
float l, u, v, *v1, *v2, *v3;
/* init */
if(vlr->v4) {
shi->u= u= 0.5f;
shi->v= v= 0.5f;
}
else {
shi->u= u= 1.0f/3.0f;
shi->v= v= 1.0f/3.0f;
}
/* setup render coordinates */
v1= vlr->v1->co;
v2= vlr->v2->co;
v3= vlr->v3->co;
/* renderco */
l= 1.0f-u-v;
shi->co[0]= l*v3[0]+u*v1[0]+v*v2[0];
shi->co[1]= l*v3[1]+u*v1[1]+v*v2[1];
shi->co[2]= l*v3[2]+u*v1[2]+v*v2[2];
shade_input_set_triangle_i(shi, obi, vlr, 0, 1, 2);
/* set up view vector */
copy_v3_v3(shi->view, shi->co);
normalize_v3(shi->view);
/* cache for shadow */
shi->samplenr++;
shi->xs= 0; // TODO
shi->ys= 0;
shade_input_set_normals(shi);
/* no normal flip */
if(shi->flippednor)
shade_input_flip_normals(shi);
madd_v3_v3fl(shi->co, shi->vn, 0.0001f); /* ugly.. */
/* not a pretty solution, but fixes common cases */
if(shi->obr->ob && shi->obr->ob->transflag & OB_NEG_SCALE) {
negate_v3(shi->vn);
negate_v3(shi->vno);
negate_v3(shi->nmapnorm);
}
/* init material vars */
// note, keep this synced with render_types.h
memcpy(&shi->r, &shi->mat->r, 23*sizeof(float));
shi->har= shi->mat->har;
/* render */
shade_input_set_shade_texco(shi);
shade_material_loop(shi, shr); /* todo: nodes */
copy_v3_v3(rad, shr->combined);
}
static void occ_build_shade(Render *re, OcclusionTree *tree)
{
ShadeSample ssamp;
ObjectInstanceRen *obi;
VlakRen *vlr;
int a;
R= *re;
/* setup shade sample with correct passes */
memset(&ssamp, 0, sizeof(ShadeSample));
ssamp.shi[0].lay= re->lay;
ssamp.shi[0].passflag= SCE_PASS_DIFFUSE|SCE_PASS_RGBA;
ssamp.shi[0].combinedflag= ~(SCE_PASS_SPEC);
ssamp.tot= 1;
for(a=0; a<tree->totface; a++) {
obi= &R.objectinstance[tree->face[a].obi];
vlr= RE_findOrAddVlak(obi->obr, tree->face[a].facenr);
occ_shade(&ssamp, obi, vlr, tree->rad[a]);
}
}
/* ------------------------- Spherical Harmonics --------------------------- */
/* Use 2nd order SH => 9 coefficients, stored in this order:
0 = (0,0),
1 = (1,-1), 2 = (1,0), 3 = (1,1),
4 = (2,-2), 5 = (2,-1), 6 = (2,0), 7 = (2,1), 8 = (2,2) */
static void sh_copy(float *shresult, float *sh)
{
memcpy(shresult, sh, sizeof(float)*9);
}
static void sh_mul(float *sh, float f)
{
int i;
for(i=0; i<9; i++)
sh[i] *= f;
}
static void sh_add(float *shresult, float *sh1, float *sh2)
{
int i;
for(i=0; i<9; i++)
shresult[i]= sh1[i] + sh2[i];
}
static void sh_from_disc(float *n, float area, float *shresult)
{
/* See formula (3) in:
"An Efficient Representation for Irradiance Environment Maps" */
float sh[9], x, y, z;
x= n[0];
y= n[1];
z= n[2];
sh[0]= 0.282095f;
sh[1]= 0.488603f*y;
sh[2]= 0.488603f*z;
sh[3]= 0.488603f*x;
sh[4]= 1.092548f*x*y;
sh[5]= 1.092548f*y*z;
sh[6]= 0.315392f*(3.0f*z*z - 1.0f);
sh[7]= 1.092548f*x*z;
sh[8]= 0.546274f*(x*x - y*y);
sh_mul(sh, area);
sh_copy(shresult, sh);
}
static float sh_eval(float *sh, float *v)
{
/* See formula (13) in:
"An Efficient Representation for Irradiance Environment Maps" */
static const float c1 = 0.429043f, c2 = 0.511664f, c3 = 0.743125f;
static const float c4 = 0.886227f, c5 = 0.247708f;
float x, y, z, sum;
x= v[0];
y= v[1];
z= v[2];
sum= c1*sh[8]*(x*x - y*y);
sum += c3*sh[6]*z*z;
sum += c4*sh[0];
sum += -c5*sh[6];
sum += 2.0f*c1*(sh[4]*x*y + sh[7]*x*z + sh[5]*y*z);
sum += 2.0f*c2*(sh[3]*x + sh[1]*y + sh[2]*z);
return sum;
}
/* ------------------------------ Building --------------------------------- */
static void occ_face(const OccFace *face, float co[3], float normal[3], float *area)
{
ObjectInstanceRen *obi;
VlakRen *vlr;
float v1[3], v2[3], v3[3], v4[3];
obi= &R.objectinstance[face->obi];
vlr= RE_findOrAddVlak(obi->obr, face->facenr);
if(co) {
if(vlr->v4)
mid_v3_v3v3(co, vlr->v1->co, vlr->v3->co);
else
cent_tri_v3(co, vlr->v1->co, vlr->v2->co, vlr->v3->co);
if(obi->flag & R_TRANSFORMED)
mul_m4_v3(obi->mat, co);
}
if(normal) {
normal[0]= -vlr->n[0];
normal[1]= -vlr->n[1];
normal[2]= -vlr->n[2];
if(obi->flag & R_TRANSFORMED)
mul_m3_v3(obi->nmat, normal);
}
if(area) {
copy_v3_v3(v1, vlr->v1->co);
copy_v3_v3(v2, vlr->v2->co);
copy_v3_v3(v3, vlr->v3->co);
if(vlr->v4) copy_v3_v3(v4, vlr->v4->co);
if(obi->flag & R_TRANSFORMED) {
mul_m4_v3(obi->mat, v1);
mul_m4_v3(obi->mat, v2);
mul_m4_v3(obi->mat, v3);
if(vlr->v4) mul_m4_v3(obi->mat, v4);
}
/* todo: correct area for instances */
if(vlr->v4)
*area= area_quad_v3(v1, v2, v3, v4);
else
*area= area_tri_v3(v1, v2, v3);
}
}
static void occ_sum_occlusion(OcclusionTree *tree, OccNode *node)
{
OccNode *child;
float occ, area, totarea, rad[3];
int a, b, indirect= tree->doindirect;
occ= 0.0f;
totarea= 0.0f;
if(indirect) zero_v3(rad);
for(b=0; b<TOTCHILD; b++) {
if(node->childflag & (1<<b)) {
a= node->child[b].face;
occ_face(&tree->face[a], 0, 0, &area);
occ += area*tree->occlusion[a];
if(indirect) madd_v3_v3fl(rad, tree->rad[a], area);
totarea += area;
}
else if(node->child[b].node) {
child= node->child[b].node;
occ_sum_occlusion(tree, child);
occ += child->area*child->occlusion;
if(indirect) madd_v3_v3fl(rad, child->rad, child->area);
totarea += child->area;
}
}
if(totarea != 0.0f) {
occ /= totarea;
if(indirect) mul_v3_fl(rad, 1.0f/totarea);
}
node->occlusion= occ;
if(indirect) copy_v3_v3(node->rad, rad);
}
static int occ_find_bbox_axis(OcclusionTree *tree, int begin, int end, float *min, float *max)
{
float len, maxlen= -1.0f;
int a, axis = 0;
INIT_MINMAX(min, max);
for(a=begin; a<end; a++)
DO_MINMAX(tree->co[a], min, max)
for(a=0; a<3; a++) {
len= max[a] - min[a];
if(len > maxlen) {
maxlen= len;
axis= a;
}
}
return axis;
}
static void occ_node_from_face(OccFace *face, OccNode *node)
{
float n[3];
occ_face(face, node->co, n, &node->area);
node->dco= 0.0f;
sh_from_disc(n, node->area, node->sh);
}
static void occ_build_dco(OcclusionTree *tree, OccNode *node, const float co[3], float *dco)
{
int b;
for(b=0; b<TOTCHILD; b++) {
float dist, d[3], nco[3];
if(node->childflag & (1<<b)) {
occ_face(tree->face+node->child[b].face, nco, NULL, NULL);
}
else if(node->child[b].node) {
OccNode *child= node->child[b].node;
occ_build_dco(tree, child, co, dco);
copy_v3_v3(nco, child->co);
}
else {
continue;
}
sub_v3_v3v3(d, nco, co);
dist= dot_v3v3(d, d);
if(dist > *dco)
*dco= dist;
}
}
static void occ_build_split(OcclusionTree *tree, int begin, int end, int *split)
{
float min[3], max[3], mid;
int axis, a, enda;
/* split in middle of boundbox. this seems faster than median split
* on complex scenes, possibly since it avoids two distant faces to
* be in the same node better? */
axis= occ_find_bbox_axis(tree, begin, end, min, max);
mid= 0.5f*(min[axis]+max[axis]);
a= begin;
enda= end;
while(a<enda) {
if(tree->co[a][axis] > mid) {
enda--;
SWAP(OccFace, tree->face[a], tree->face[enda]);
SWAP(float, tree->co[a][0], tree->co[enda][0]);
SWAP(float, tree->co[a][1], tree->co[enda][1]);
SWAP(float, tree->co[a][2], tree->co[enda][2]);
}
else
a++;
}
*split= enda;
}
static void occ_build_8_split(OcclusionTree *tree, int begin, int end, int *offset, int *count)
{
/* split faces into eight groups */
int b, splitx, splity[2], splitz[4];
occ_build_split(tree, begin, end, &splitx);
/* force split if none found, to deal with degenerate geometry */
if(splitx == begin || splitx == end)
splitx= (begin+end)/2;
occ_build_split(tree, begin, splitx, &splity[0]);
occ_build_split(tree, splitx, end, &splity[1]);
occ_build_split(tree, begin, splity[0], &splitz[0]);
occ_build_split(tree, splity[0], splitx, &splitz[1]);
occ_build_split(tree, splitx, splity[1], &splitz[2]);
occ_build_split(tree, splity[1], end, &splitz[3]);
offset[0]= begin;
offset[1]= splitz[0];
offset[2]= splity[0];
offset[3]= splitz[1];
offset[4]= splitx;
offset[5]= splitz[2];
offset[6]= splity[1];
offset[7]= splitz[3];
for(b=0; b<7; b++)
count[b]= offset[b+1] - offset[b];
count[7]= end - offset[7];
}
static void occ_build_recursive(OcclusionTree *tree, OccNode *node, int begin, int end, int depth);
static void *exec_occ_build(void *data)
{
OcclusionBuildThread *othread= (OcclusionBuildThread*)data;
occ_build_recursive(othread->tree, othread->node, othread->begin, othread->end, othread->depth);
return 0;
}
static void occ_build_recursive(OcclusionTree *tree, OccNode *node, int begin, int end, int depth)
{
ListBase threads;
OcclusionBuildThread othreads[BLENDER_MAX_THREADS];
OccNode *child, tmpnode;
/* OccFace *face; */
int a, b, totthread=0, offset[TOTCHILD], count[TOTCHILD];
/* add a new node */
node->occlusion= 1.0f;
/* leaf node with only children */
if(end - begin <= TOTCHILD) {
for(a=begin, b=0; a<end; a++, b++) {
/* face= &tree->face[a]; */
node->child[b].face= a;
node->childflag |= (1<<b);
}
}
else {
/* order faces */
occ_build_8_split(tree, begin, end, offset, count);
if(depth == 1 && tree->dothreadedbuild)
BLI_init_threads(&threads, exec_occ_build, tree->totbuildthread);
for(b=0; b<TOTCHILD; b++) {
if(count[b] == 0) {
node->child[b].node= NULL;
}
else if(count[b] == 1) {
/* face= &tree->face[offset[b]]; */
node->child[b].face= offset[b];
node->childflag |= (1<<b);
}
else {
if(tree->dothreadedbuild)
BLI_lock_thread(LOCK_CUSTOM1);
child= BLI_memarena_alloc(tree->arena, sizeof(OccNode));
node->child[b].node= child;
/* keep track of maximum depth for stack */
if(depth+1 > tree->maxdepth)
tree->maxdepth= depth+1;
if(tree->dothreadedbuild)
BLI_unlock_thread(LOCK_CUSTOM1);
if(depth == 1 && tree->dothreadedbuild) {
othreads[totthread].tree= tree;
othreads[totthread].node= child;
othreads[totthread].begin= offset[b];
othreads[totthread].end= offset[b]+count[b];
othreads[totthread].depth= depth+1;
BLI_insert_thread(&threads, &othreads[totthread]);
totthread++;
}
else
occ_build_recursive(tree, child, offset[b], offset[b]+count[b], depth+1);
}
}
if(depth == 1 && tree->dothreadedbuild)
BLI_end_threads(&threads);
}
/* combine area, position and sh */
for(b=0; b<TOTCHILD; b++) {
if(node->childflag & (1<<b)) {
child= &tmpnode;
occ_node_from_face(tree->face+node->child[b].face, &tmpnode);
}
else {
child= node->child[b].node;
}
if(child) {
node->area += child->area;
sh_add(node->sh, node->sh, child->sh);
madd_v3_v3fl(node->co, child->co, child->area);
}
}
if(node->area != 0.0f)
mul_v3_fl(node->co, 1.0f/node->area);
/* compute maximum distance from center */
node->dco= 0.0f;
if(node->area > 0.0f)
occ_build_dco(tree, node, node->co, &node->dco);
}
static void occ_build_sh_normalize(OccNode *node)
{
/* normalize spherical harmonics to not include area, so
* we can clamp the dot product and then mutliply by area */
int b;
if(node->area != 0.0f)
sh_mul(node->sh, 1.0f/node->area);
for(b=0; b<TOTCHILD; b++) {
if(node->childflag & (1<<b));
else if(node->child[b].node)
occ_build_sh_normalize(node->child[b].node);
}
}
static OcclusionTree *occ_tree_build(Render *re)
{
OcclusionTree *tree;
ObjectInstanceRen *obi;
ObjectRen *obr;
Material *ma;
VlakRen *vlr= NULL;
int a, b, c, totface;
/* count */
totface= 0;
for(obi=re->instancetable.first; obi; obi=obi->next) {
obr= obi->obr;
for(a=0; a<obr->totvlak; a++) {
if((a & 255)==0) vlr= obr->vlaknodes[a>>8].vlak;
else vlr++;
ma= vlr->mat;
if((ma->shade_flag & MA_APPROX_OCCLUSION) && (ma->material_type == MA_TYPE_SURFACE))
totface++;
}
}
if(totface == 0)
return NULL;
tree= MEM_callocN(sizeof(OcclusionTree), "OcclusionTree");
tree->totface= totface;
/* parameters */
tree->error= get_render_aosss_error(&re->r, re->wrld.ao_approx_error);
tree->distfac= (re->wrld.aomode & WO_AODIST)? re->wrld.aodistfac: 0.0f;
tree->doindirect= (re->wrld.ao_indirect_energy > 0.0f && re->wrld.ao_indirect_bounces > 0);
/* allocation */
tree->arena= BLI_memarena_new(0x8000 * sizeof(OccNode), "occ tree arena");
BLI_memarena_use_calloc(tree->arena);
if(re->wrld.aomode & WO_AOCACHE)
tree->cache= MEM_callocN(sizeof(OcclusionCache)*BLENDER_MAX_THREADS, "OcclusionCache");
tree->face= MEM_callocN(sizeof(OccFace)*totface, "OcclusionFace");
tree->co= MEM_callocN(sizeof(float)*3*totface, "OcclusionCo");
tree->occlusion= MEM_callocN(sizeof(float)*totface, "OcclusionOcclusion");
if(tree->doindirect)
tree->rad= MEM_callocN(sizeof(float)*3*totface, "OcclusionRad");
/* make array of face pointers */
for(b=0, c=0, obi=re->instancetable.first; obi; obi=obi->next, c++) {
obr= obi->obr;
for(a=0; a<obr->totvlak; a++) {
if((a & 255)==0) vlr= obr->vlaknodes[a>>8].vlak;
else vlr++;
ma= vlr->mat;
if((ma->shade_flag & MA_APPROX_OCCLUSION) && (ma->material_type == MA_TYPE_SURFACE)) {
tree->face[b].obi= c;
tree->face[b].facenr= a;
tree->occlusion[b]= 1.0f;
occ_face(&tree->face[b], tree->co[b], NULL, NULL);
b++;
}
}
}
/* threads */
tree->totbuildthread= (re->r.threads > 1 && totface > 10000)? 8: 1;
tree->dothreadedbuild= (tree->totbuildthread > 1);
/* recurse */
tree->root= BLI_memarena_alloc(tree->arena, sizeof(OccNode));
tree->maxdepth= 1;
occ_build_recursive(tree, tree->root, 0, totface, 1);
if(tree->doindirect) {
occ_build_shade(re, tree);
occ_sum_occlusion(tree, tree->root);
}
MEM_freeN(tree->co);
tree->co= NULL;
occ_build_sh_normalize(tree->root);
for(a=0; a<BLENDER_MAX_THREADS; a++)
tree->stack[a]= MEM_callocN(sizeof(OccNode)*TOTCHILD*(tree->maxdepth+1), "OccStack");
return tree;
}
static void occ_free_tree(OcclusionTree *tree)
{
int a;
if(tree) {
if(tree->arena) BLI_memarena_free(tree->arena);
for(a=0; a<BLENDER_MAX_THREADS; a++)
if(tree->stack[a])
MEM_freeN(tree->stack[a]);
if(tree->occlusion) MEM_freeN(tree->occlusion);
if(tree->cache) MEM_freeN(tree->cache);
if(tree->face) MEM_freeN(tree->face);
if(tree->rad) MEM_freeN(tree->rad);
MEM_freeN(tree);
}
}
/* ------------------------- Traversal --------------------------- */
static float occ_solid_angle(OccNode *node, const float v[3], float d2, float invd2, const float receivenormal[3])
{
float dotreceive, dotemit;
float ev[3];
ev[0]= -v[0]*invd2;
ev[1]= -v[1]*invd2;
ev[2]= -v[2]*invd2;
dotemit= sh_eval(node->sh, ev);
dotreceive= dot_v3v3(receivenormal, v)*invd2;
CLAMP(dotemit, 0.0f, 1.0f);
CLAMP(dotreceive, 0.0f, 1.0f);
return ((node->area*dotemit*dotreceive)/(d2 + node->area*INVPI))*INVPI;
}
static void VecAddDir(float result[3], const float v1[3], const float v2[3], const float fac)
{
result[0]= v1[0] + fac*(v2[0] - v1[0]);
result[1]= v1[1] + fac*(v2[1] - v1[1]);
result[2]= v1[2] + fac*(v2[2] - v1[2]);
}
static int occ_visible_quad(float *p, const float n[3], const float v0[3], const float *v1, const float *v2, float q0[3], float q1[3], float q2[3], float q3[3])
{
static const float epsilon = 1e-6f;
float c, sd[3];
c= dot_v3v3(n, p);
/* signed distances from the vertices to the plane. */
sd[0]= dot_v3v3(n, v0) - c;
sd[1]= dot_v3v3(n, v1) - c;
sd[2]= dot_v3v3(n, v2) - c;
if(fabsf(sd[0]) < epsilon) sd[0] = 0.0f;
if(fabsf(sd[1]) < epsilon) sd[1] = 0.0f;
if(fabsf(sd[2]) < epsilon) sd[2] = 0.0f;
if(sd[0] > 0) {
if(sd[1] > 0) {
if(sd[2] > 0) {
// +++
copy_v3_v3(q0, v0);
copy_v3_v3(q1, v1);
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
else if(sd[2] < 0) {
// ++-
copy_v3_v3(q0, v0);
copy_v3_v3(q1, v1);
VecAddDir(q2, v1, v2, (sd[1]/(sd[1]-sd[2])));
VecAddDir(q3, v0, v2, (sd[0]/(sd[0]-sd[2])));
}
else {
// ++0
copy_v3_v3(q0, v0);
copy_v3_v3(q1, v1);
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
}
else if(sd[1] < 0) {
if(sd[2] > 0) {
// +-+
copy_v3_v3(q0, v0);
VecAddDir(q1, v0, v1, (sd[0]/(sd[0]-sd[1])));
VecAddDir(q2, v1, v2, (sd[1]/(sd[1]-sd[2])));
copy_v3_v3(q3, v2);
}
else if(sd[2] < 0) {
// +--
copy_v3_v3(q0, v0);
VecAddDir(q1, v0, v1, (sd[0]/(sd[0]-sd[1])));
VecAddDir(q2, v0, v2, (sd[0]/(sd[0]-sd[2])));
copy_v3_v3(q3, q2);
}
else {
// +-0
copy_v3_v3(q0, v0);
VecAddDir(q1, v0, v1, (sd[0]/(sd[0]-sd[1])));
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
}
else {
if(sd[2] > 0) {
// +0+
copy_v3_v3(q0, v0);
copy_v3_v3(q1, v1);
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
else if(sd[2] < 0) {
// +0-
copy_v3_v3(q0, v0);
copy_v3_v3(q1, v1);
VecAddDir(q2, v0, v2, (sd[0]/(sd[0]-sd[2])));
copy_v3_v3(q3, q2);
}
else {
// +00
copy_v3_v3(q0, v0);
copy_v3_v3(q1, v1);
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
}
}
else if(sd[0] < 0) {
if(sd[1] > 0) {
if(sd[2] > 0) {
// -++
VecAddDir(q0, v0, v1, (sd[0]/(sd[0]-sd[1])));
copy_v3_v3(q1, v1);
copy_v3_v3(q2, v2);
VecAddDir(q3, v0, v2, (sd[0]/(sd[0]-sd[2])));
}
else if(sd[2] < 0) {
// -+-
VecAddDir(q0, v0, v1, (sd[0]/(sd[0]-sd[1])));
copy_v3_v3(q1, v1);
VecAddDir(q2, v1, v2, (sd[1]/(sd[1]-sd[2])));
copy_v3_v3(q3, q2);
}
else {
// -+0
VecAddDir(q0, v0, v1, (sd[0]/(sd[0]-sd[1])));
copy_v3_v3(q1, v1);
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
}
else if(sd[1] < 0) {
if(sd[2] > 0) {
// --+
VecAddDir(q0, v0, v2, (sd[0]/(sd[0]-sd[2])));
VecAddDir(q1, v1, v2, (sd[1]/(sd[1]-sd[2])));
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
else if(sd[2] < 0) {
// ---
return 0;
}
else {
// --0
return 0;
}
}
else {
if(sd[2] > 0) {
// -0+
VecAddDir(q0, v0, v2, (sd[0]/(sd[0]-sd[2])));
copy_v3_v3(q1, v1);
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
else if(sd[2] < 0) {
// -0-
return 0;
}
else {
// -00
return 0;
}
}
}
else {
if(sd[1] > 0) {
if(sd[2] > 0) {
// 0++
copy_v3_v3(q0, v0);
copy_v3_v3(q1, v1);
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
else if(sd[2] < 0) {
// 0+-
copy_v3_v3(q0, v0);
copy_v3_v3(q1, v1);
VecAddDir(q2, v1, v2, (sd[1]/(sd[1]-sd[2])));
copy_v3_v3(q3, q2);
}
else {
// 0+0
copy_v3_v3(q0, v0);
copy_v3_v3(q1, v1);
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
}
else if(sd[1] < 0) {
if(sd[2] > 0) {
// 0-+
copy_v3_v3(q0, v0);
VecAddDir(q1, v1, v2, (sd[1]/(sd[1]-sd[2])));
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
else if(sd[2] < 0) {
// 0--
return 0;
}
else {
// 0-0
return 0;
}
}
else {
if(sd[2] > 0) {
// 00+
copy_v3_v3(q0, v0);
copy_v3_v3(q1, v1);
copy_v3_v3(q2, v2);
copy_v3_v3(q3, q2);
}
else if(sd[2] < 0) {
// 00-
return 0;
}
else {
// 000
return 0;
}
}
}
return 1;
}
/* altivec optimization, this works, but is unused */
#if 0
#include <Accelerate/Accelerate.h>
typedef union {
vFloat v;
float f[4];
} vFloatResult;
static vFloat vec_splat_float(float val)
{
return (vFloat){val, val, val, val};
}
static float occ_quad_form_factor(float *p, float *n, float *q0, float *q1, float *q2, float *q3)
{
vFloat vcos, rlen, vrx, vry, vrz, vsrx, vsry, vsrz, gx, gy, gz, vangle;
vUInt8 rotate = (vUInt8){4,5,6,7,8,9,10,11,12,13,14,15,0,1,2,3};
vFloatResult vresult;
float result;
/* compute r* */
vrx = (vFloat){q0[0], q1[0], q2[0], q3[0]} - vec_splat_float(p[0]);
vry = (vFloat){q0[1], q1[1], q2[1], q3[1]} - vec_splat_float(p[1]);
vrz = (vFloat){q0[2], q1[2], q2[2], q3[2]} - vec_splat_float(p[2]);
/* normalize r* */
rlen = vec_rsqrte(vrx*vrx + vry*vry + vrz*vrz + vec_splat_float(1e-16f));
vrx = vrx*rlen;
vry = vry*rlen;
vrz = vrz*rlen;
/* rotate r* for cross and dot */
vsrx= vec_perm(vrx, vrx, rotate);
vsry= vec_perm(vry, vry, rotate);
vsrz= vec_perm(vrz, vrz, rotate);
/* cross product */
gx = vsry*vrz - vsrz*vry;
gy = vsrz*vrx - vsrx*vrz;
gz = vsrx*vry - vsry*vrx;
/* normalize */
rlen = vec_rsqrte(gx*gx + gy*gy + gz*gz + vec_splat_float(1e-16f));
gx = gx*rlen;
gy = gy*rlen;
gz = gz*rlen;
/* angle */
vcos = vrx*vsrx + vry*vsry + vrz*vsrz;
vcos= vec_max(vec_min(vcos, vec_splat_float(1.0f)), vec_splat_float(-1.0f));
vangle= vacosf(vcos);
/* dot */
vresult.v = (vec_splat_float(n[0])*gx +
vec_splat_float(n[1])*gy +
vec_splat_float(n[2])*gz)*vangle;
result= (vresult.f[0] + vresult.f[1] + vresult.f[2] + vresult.f[3])*(0.5f/(float)M_PI);
result= MAX2(result, 0.0f);
return result;
}
#endif
/* SSE optimization, acos code doesn't work */
#if 0
#include <xmmintrin.h>
static __m128 sse_approx_acos(__m128 x)
{
/* needs a better approximation than taylor expansion of acos, since that
* gives big erros for near 1.0 values, sqrt(2*x)*acos(1-x) should work
* better, see http://www.tom.womack.net/projects/sse-fast-arctrig.html */
return _mm_set_ps1(1.0f);
}
static float occ_quad_form_factor(float *p, float *n, float *q0, float *q1, float *q2, float *q3)
{
float r0[3], r1[3], r2[3], r3[3], g0[3], g1[3], g2[3], g3[3];
float a1, a2, a3, a4, dot1, dot2, dot3, dot4, result;
float fresult[4] __attribute__((aligned(16)));
__m128 qx, qy, qz, rx, ry, rz, rlen, srx, sry, srz, gx, gy, gz, glen, rcos, angle, aresult;
/* compute r */
qx = _mm_set_ps(q3[0], q2[0], q1[0], q0[0]);
qy = _mm_set_ps(q3[1], q2[1], q1[1], q0[1]);
qz = _mm_set_ps(q3[2], q2[2], q1[2], q0[2]);
rx = qx - _mm_set_ps1(p[0]);
ry = qy - _mm_set_ps1(p[1]);
rz = qz - _mm_set_ps1(p[2]);
/* normalize r */
rlen = _mm_rsqrt_ps(rx*rx + ry*ry + rz*rz + _mm_set_ps1(1e-16f));
rx = rx*rlen;
ry = ry*rlen;
rz = rz*rlen;
/* cross product */
srx = _mm_shuffle_ps(rx, rx, _MM_SHUFFLE(0,3,2,1));
sry = _mm_shuffle_ps(ry, ry, _MM_SHUFFLE(0,3,2,1));
srz = _mm_shuffle_ps(rz, rz, _MM_SHUFFLE(0,3,2,1));
gx = sry*rz - srz*ry;
gy = srz*rx - srx*rz;
gz = srx*ry - sry*rx;
/* normalize g */
glen = _mm_rsqrt_ps(gx*gx + gy*gy + gz*gz + _mm_set_ps1(1e-16f));
gx = gx*glen;
gy = gy*glen;
gz = gz*glen;
/* compute angle */
rcos = rx*srx + ry*sry + rz*srz;
rcos= _mm_max_ps(_mm_min_ps(rcos, _mm_set_ps1(1.0f)), _mm_set_ps1(-1.0f));
angle = sse_approx_cos(rcos);
aresult = (_mm_set_ps1(n[0])*gx + _mm_set_ps1(n[1])*gy + _mm_set_ps1(n[2])*gz)*angle;
/* sum together */
result= (fresult[0] + fresult[1] + fresult[2] + fresult[3])*(0.5f/(float)M_PI);
result= MAX2(result, 0.0f);
return result;
}
#endif
static void normalizef(float *n)
{
float d;
d= dot_v3v3(n, n);
if(d > 1.0e-35F) {
d= 1.0f/sqrtf(d);
n[0] *= d;
n[1] *= d;
n[2] *= d;
}
}
static float occ_quad_form_factor(const float p[3], const float n[3], const float q0[3], const float q1[3], const float q2[3], const float q3[3])
{
float r0[3], r1[3], r2[3], r3[3], g0[3], g1[3], g2[3], g3[3];
float a1, a2, a3, a4, dot1, dot2, dot3, dot4, result;
sub_v3_v3v3(r0, q0, p);
sub_v3_v3v3(r1, q1, p);
sub_v3_v3v3(r2, q2, p);
sub_v3_v3v3(r3, q3, p);
normalizef(r0);
normalizef(r1);
normalizef(r2);
normalizef(r3);
cross_v3_v3v3(g0, r1, r0); normalizef(g0);
cross_v3_v3v3(g1, r2, r1); normalizef(g1);
cross_v3_v3v3(g2, r3, r2); normalizef(g2);
cross_v3_v3v3(g3, r0, r3); normalizef(g3);
a1= saacosf(dot_v3v3(r0, r1));
a2= saacosf(dot_v3v3(r1, r2));
a3= saacosf(dot_v3v3(r2, r3));
a4= saacosf(dot_v3v3(r3, r0));
dot1= dot_v3v3(n, g0);
dot2= dot_v3v3(n, g1);
dot3= dot_v3v3(n, g2);
dot4= dot_v3v3(n, g3);
result= (a1*dot1 + a2*dot2 + a3*dot3 + a4*dot4)*0.5f/(float)M_PI;
result= MAX2(result, 0.0f);
return result;
}
static float occ_form_factor(OccFace *face, float *p, float *n)
{
ObjectInstanceRen *obi;
VlakRen *vlr;
float v1[3], v2[3], v3[3], v4[3], q0[3], q1[3], q2[3], q3[3], contrib= 0.0f;
obi= &R.objectinstance[face->obi];
vlr= RE_findOrAddVlak(obi->obr, face->facenr);
copy_v3_v3(v1, vlr->v1->co);
copy_v3_v3(v2, vlr->v2->co);
copy_v3_v3(v3, vlr->v3->co);
if(obi->flag & R_TRANSFORMED) {
mul_m4_v3(obi->mat, v1);
mul_m4_v3(obi->mat, v2);
mul_m4_v3(obi->mat, v3);
}
if(occ_visible_quad(p, n, v1, v2, v3, q0, q1, q2, q3))
contrib += occ_quad_form_factor(p, n, q0, q1, q2, q3);
if(vlr->v4) {
copy_v3_v3(v4, vlr->v4->co);
if(obi->flag & R_TRANSFORMED)
mul_m4_v3(obi->mat, v4);
if(occ_visible_quad(p, n, v1, v3, v4, q0, q1, q2, q3))
contrib += occ_quad_form_factor(p, n, q0, q1, q2, q3);
}
return contrib;
}
static void occ_lookup(OcclusionTree *tree, int thread, OccFace *exclude, float *pp, float *pn, float *occ, float rad[3], float bentn[3])
{
OccNode *node, **stack;
OccFace *face;
float resultocc, resultrad[3], v[3], p[3], n[3], co[3], invd2;
float distfac, fac, error, d2, weight, emitarea;
int b, f, totstack;
/* init variables */
copy_v3_v3(p, pp);
copy_v3_v3(n, pn);
madd_v3_v3fl(p, n, 1e-4f);
if(bentn)
copy_v3_v3(bentn, n);
error= tree->error;
distfac= tree->distfac;
resultocc= 0.0f;
zero_v3(resultrad);
/* init stack */
stack= tree->stack[thread];
stack[0]= tree->root;
totstack= 1;
while(totstack) {
/* pop point off the stack */
node= stack[--totstack];
sub_v3_v3v3(v, node->co, p);
d2= dot_v3v3(v, v) + 1e-16f;
emitarea= MAX2(node->area, node->dco);
if(d2*error > emitarea) {
if(distfac != 0.0f) {
fac= 1.0f/(1.0f + distfac*d2);
if(fac < 0.01f)
continue;
}
else
fac= 1.0f;
/* accumulate occlusion from spherical harmonics */
invd2 = 1.0f/sqrtf(d2);
weight= occ_solid_angle(node, v, d2, invd2, n);
if(rad)
madd_v3_v3fl(resultrad, node->rad, weight*fac);
weight *= node->occlusion;
if(bentn) {
bentn[0] -= weight*invd2*v[0];
bentn[1] -= weight*invd2*v[1];
bentn[2] -= weight*invd2*v[2];
}
resultocc += weight*fac;
}
else {
/* traverse into children */
for(b=0; b<TOTCHILD; b++) {
if(node->childflag & (1<<b)) {
f= node->child[b].face;
face= &tree->face[f];
/* accumulate occlusion with face form factor */
if(!exclude || !(face->obi == exclude->obi && face->facenr == exclude->facenr)) {
if(bentn || distfac != 0.0f) {
occ_face(face, co, NULL, NULL);
sub_v3_v3v3(v, co, p);
d2= dot_v3v3(v, v) + 1e-16f;
fac= (distfac == 0.0f)? 1.0f: 1.0f/(1.0f + distfac*d2);
if(fac < 0.01f)
continue;
}
else
fac= 1.0f;
weight= occ_form_factor(face, p, n);
if(rad)
madd_v3_v3fl(resultrad, tree->rad[f], weight*fac);
weight *= tree->occlusion[f];
if(bentn) {
invd2= 1.0f/sqrtf(d2);
bentn[0] -= weight*invd2*v[0];
bentn[1] -= weight*invd2*v[1];
bentn[2] -= weight*invd2*v[2];
}
resultocc += weight*fac;
}
}
else if(node->child[b].node) {
/* push child on the stack */
stack[totstack++]= node->child[b].node;
}
}
}
}
if(occ) *occ= resultocc;
if(rad) copy_v3_v3(rad, resultrad);
/*if(rad && exclude) {
int a;
for(a=0; a<tree->totface; a++)
if((tree->face[a].obi == exclude->obi && tree->face[a].facenr == exclude->facenr))
copy_v3_v3(rad, tree->rad[a]);
}*/
if(bentn) normalize_v3(bentn);
}
static void occ_compute_bounces(Render *re, OcclusionTree *tree, int totbounce)
{
float (*rad)[3], (*sum)[3], (*tmp)[3], co[3], n[3], occ;
int bounce, i;
rad= MEM_callocN(sizeof(float)*3*tree->totface, "OcclusionBounceRad");
sum= MEM_dupallocN(tree->rad);
for(bounce=1; bounce<totbounce; bounce++) {
for(i=0; i<tree->totface; i++) {
occ_face(&tree->face[i], co, n, NULL);
madd_v3_v3fl(co, n, 1e-8f);
occ_lookup(tree, 0, &tree->face[i], co, n, &occ, rad[i], NULL);
rad[i][0]= MAX2(rad[i][0], 0.0f);
rad[i][1]= MAX2(rad[i][1], 0.0f);
rad[i][2]= MAX2(rad[i][2], 0.0f);
add_v3_v3(sum[i], rad[i]);
if(re->test_break(re->tbh))
break;
}
if(re->test_break(re->tbh))
break;
tmp= tree->rad;
tree->rad= rad;
rad= tmp;
occ_sum_occlusion(tree, tree->root);
}
MEM_freeN(rad);
MEM_freeN(tree->rad);
tree->rad= sum;
if(!re->test_break(re->tbh))
occ_sum_occlusion(tree, tree->root);
}
static void occ_compute_passes(Render *re, OcclusionTree *tree, int totpass)
{
float *occ, co[3], n[3];
int pass, i;
occ= MEM_callocN(sizeof(float)*tree->totface, "OcclusionPassOcc");
for(pass=0; pass<totpass; pass++) {
for(i=0; i<tree->totface; i++) {
occ_face(&tree->face[i], co, n, NULL);
negate_v3(n);
madd_v3_v3fl(co, n, 1e-8f);
occ_lookup(tree, 0, &tree->face[i], co, n, &occ[i], NULL, NULL);
if(re->test_break(re->tbh))
break;
}
if(re->test_break(re->tbh))
break;
for(i=0; i<tree->totface; i++) {
tree->occlusion[i] -= occ[i]; //MAX2(1.0f-occ[i], 0.0f);
if(tree->occlusion[i] < 0.0f)
tree->occlusion[i]= 0.0f;
}
occ_sum_occlusion(tree, tree->root);
}
MEM_freeN(occ);
}
static void sample_occ_tree(Render *re, OcclusionTree *tree, OccFace *exclude, float *co, float *n, int thread, int onlyshadow, float *ao, float *env, float *indirect)
{
float nn[3], bn[3], fac, occ, occlusion, correction, rad[3];
int envcolor;
envcolor= re->wrld.aocolor;
if(onlyshadow)
envcolor= WO_AOPLAIN;
negate_v3_v3(nn, n);
occ_lookup(tree, thread, exclude, co, nn, &occ, (tree->doindirect)? rad: NULL, (env && envcolor)? bn: NULL);
correction= re->wrld.ao_approx_correction;
occlusion= (1.0f-correction)*(1.0f-occ);
CLAMP(occlusion, 0.0f, 1.0f);
if(correction != 0.0f)
occlusion += correction*exp(-occ);
if(env) {
/* sky shading using bent normal */
if(ELEM(envcolor, WO_AOSKYCOL, WO_AOSKYTEX)) {
fac= 0.5f*(1.0f+bn[0]*re->grvec[0]+ bn[1]*re->grvec[1]+ bn[2]*re->grvec[2]);
env[0]= (1.0f-fac)*re->wrld.horr + fac*re->wrld.zenr;
env[1]= (1.0f-fac)*re->wrld.horg + fac*re->wrld.zeng;
env[2]= (1.0f-fac)*re->wrld.horb + fac*re->wrld.zenb;
mul_v3_fl(env, occlusion);
}
else {
env[0]= occlusion;
env[1]= occlusion;
env[2]= occlusion;
}
#if 0
else { /* WO_AOSKYTEX */
float dxyview[3];
bn[0]= -bn[0];
bn[1]= -bn[1];
bn[2]= -bn[2];
dxyview[0]= 1.0f;
dxyview[1]= 1.0f;
dxyview[2]= 0.0f;
shadeSkyView(ao, co, bn, dxyview);
}
#endif
}
if(ao) {
ao[0]= occlusion;
ao[1]= occlusion;
ao[2]= occlusion;
}
if(tree->doindirect) copy_v3_v3(indirect, rad);
else zero_v3(indirect);
}
/* ---------------------------- Caching ------------------------------- */
static OcclusionCacheSample *find_occ_sample(OcclusionCache *cache, int x, int y)
{
x -= cache->x;
y -= cache->y;
x /= cache->step;
y /= cache->step;
x *= cache->step;
y *= cache->step;
if(x < 0 || x >= cache->w || y < 0 || y >= cache->h)
return NULL;
else
return &cache->sample[y*cache->w + x];
}
static int sample_occ_cache(OcclusionTree *tree, float *co, float *n, int x, int y, int thread, float *ao, float *env, float *indirect)
{
OcclusionCache *cache;
OcclusionCacheSample *samples[4], *sample;
float wn[4], wz[4], wb[4], tx, ty, w, totw, mino, maxo;
float d[3], dist2;
int i, x1, y1, x2, y2;
if(!tree->cache)
return 0;
/* first try to find a sample in the same pixel */
cache= &tree->cache[thread];
if(cache->sample && cache->step) {
sample= &cache->sample[(y-cache->y)*cache->w + (x-cache->x)];
if(sample->filled) {
sub_v3_v3v3(d, sample->co, co);
dist2= dot_v3v3(d, d);
if(dist2 < 0.5f*sample->dist2 && dot_v3v3(sample->n, n) > 0.98f) {
copy_v3_v3(ao, sample->ao);
copy_v3_v3(env, sample->env);
copy_v3_v3(indirect, sample->indirect);
return 1;
}
}
}
else
return 0;
/* try to interpolate between 4 neighbouring pixels */
samples[0]= find_occ_sample(cache, x, y);
samples[1]= find_occ_sample(cache, x+cache->step, y);
samples[2]= find_occ_sample(cache, x, y+cache->step);
samples[3]= find_occ_sample(cache, x+cache->step, y+cache->step);
for(i=0; i<4; i++)
if(!samples[i] || !samples[i]->filled)
return 0;
/* require intensities not being too different */
mino= MIN4(samples[0]->intensity, samples[1]->intensity, samples[2]->intensity, samples[3]->intensity);
maxo= MAX4(samples[0]->intensity, samples[1]->intensity, samples[2]->intensity, samples[3]->intensity);
if(maxo - mino > 0.05f)
return 0;
/* compute weighted interpolation between samples */
zero_v3(ao);
zero_v3(env);
zero_v3(indirect);
totw= 0.0f;
x1= samples[0]->x;
y1= samples[0]->y;
x2= samples[3]->x;
y2= samples[3]->y;
tx= (float)(x2 - x)/(float)(x2 - x1);
ty= (float)(y2 - y)/(float)(y2 - y1);
wb[3]= (1.0f-tx)*(1.0f-ty);
wb[2]= (tx)*(1.0f-ty);
wb[1]= (1.0f-tx)*(ty);
wb[0]= tx*ty;
for(i=0; i<4; i++) {
sub_v3_v3v3(d, samples[i]->co, co);
//dist2= dot_v3v3(d, d);
wz[i]= 1.0f; //(samples[i]->dist2/(1e-4f + dist2));
wn[i]= pow(dot_v3v3(samples[i]->n, n), 32.0f);
w= wb[i]*wn[i]*wz[i];
totw += w;
madd_v3_v3fl(ao, samples[i]->ao, w);
madd_v3_v3fl(env, samples[i]->env, w);
madd_v3_v3fl(indirect, samples[i]->indirect, w);
}
if(totw >= 0.9f) {
totw= 1.0f/totw;
mul_v3_fl(ao, totw);
mul_v3_fl(env, totw);
mul_v3_fl(indirect, totw);
return 1;
}
return 0;
}
static void sample_occ_surface(ShadeInput *shi)
{
StrandRen *strand= shi->strand;
StrandSurface *mesh= strand->buffer->surface;
int *face, *index = RE_strandren_get_face(shi->obr, strand, 0);
float w[4], *co1, *co2, *co3, *co4;
if(mesh && mesh->face && mesh->co && mesh->ao && index) {
face= mesh->face[*index];
co1= mesh->co[face[0]];
co2= mesh->co[face[1]];
co3= mesh->co[face[2]];
co4= (face[3])? mesh->co[face[3]]: NULL;
interp_weights_face_v3(w, co1, co2, co3, co4, strand->vert->co);
zero_v3(shi->ao);
zero_v3(shi->env);
zero_v3(shi->indirect);
madd_v3_v3fl(shi->ao, mesh->ao[face[0]], w[0]);
madd_v3_v3fl(shi->env, mesh->env[face[0]], w[0]);
madd_v3_v3fl(shi->indirect, mesh->indirect[face[0]], w[0]);
madd_v3_v3fl(shi->ao, mesh->ao[face[1]], w[1]);
madd_v3_v3fl(shi->env, mesh->env[face[1]], w[1]);
madd_v3_v3fl(shi->indirect, mesh->indirect[face[1]], w[1]);
madd_v3_v3fl(shi->ao, mesh->ao[face[2]], w[2]);
madd_v3_v3fl(shi->env, mesh->env[face[2]], w[2]);
madd_v3_v3fl(shi->indirect, mesh->indirect[face[2]], w[2]);
if(face[3]) {
madd_v3_v3fl(shi->ao, mesh->ao[face[3]], w[3]);
madd_v3_v3fl(shi->env, mesh->env[face[3]], w[3]);
madd_v3_v3fl(shi->indirect, mesh->indirect[face[3]], w[3]);
}
}
else {
shi->ao[0]= 1.0f;
shi->ao[1]= 1.0f;
shi->ao[2]= 1.0f;
zero_v3(shi->env);
zero_v3(shi->indirect);
}
}
/* ------------------------- External Functions --------------------------- */
static void *exec_strandsurface_sample(void *data)
{
OcclusionThread *othread= (OcclusionThread*)data;
Render *re= othread->re;
StrandSurface *mesh= othread->mesh;
float ao[3], env[3], indirect[3], co[3], n[3], *co1, *co2, *co3, *co4;
int a, *face;
for(a=othread->begin; a<othread->end; a++) {
face= mesh->face[a];
co1= mesh->co[face[0]];
co2= mesh->co[face[1]];
co3= mesh->co[face[2]];
if(face[3]) {
co4= mesh->co[face[3]];
mid_v3_v3v3(co, co1, co3);
normal_quad_v3( n,co1, co2, co3, co4);
}
else {
cent_tri_v3(co, co1, co2, co3);
normal_tri_v3( n,co1, co2, co3);
}
negate_v3(n);
sample_occ_tree(re, re->occlusiontree, NULL, co, n, othread->thread, 0, ao, env, indirect);
copy_v3_v3(othread->faceao[a], ao);
copy_v3_v3(othread->faceenv[a], env);
copy_v3_v3(othread->faceindirect[a], indirect);
}
return 0;
}
void make_occ_tree(Render *re)
{
OcclusionThread othreads[BLENDER_MAX_THREADS];
OcclusionTree *tree;
StrandSurface *mesh;
ListBase threads;
float ao[3], env[3], indirect[3], (*faceao)[3], (*faceenv)[3], (*faceindirect)[3];
int a, totface, totthread, *face, *count;
/* ugly, needed for occ_face */
R= *re;
re->i.infostr= "Occlusion preprocessing";
re->stats_draw(re->sdh, &re->i);
re->occlusiontree= tree= occ_tree_build(re);
if(tree) {
if(re->wrld.ao_approx_passes > 0)
occ_compute_passes(re, tree, re->wrld.ao_approx_passes);
if(tree->doindirect && (re->wrld.mode & WO_INDIRECT_LIGHT))
occ_compute_bounces(re, tree, re->wrld.ao_indirect_bounces);
for(mesh=re->strandsurface.first; mesh; mesh=mesh->next) {
if(!mesh->face || !mesh->co || !mesh->ao)
continue;
count= MEM_callocN(sizeof(int)*mesh->totvert, "OcclusionCount");
faceao= MEM_callocN(sizeof(float)*3*mesh->totface, "StrandSurfFaceAO");
faceenv= MEM_callocN(sizeof(float)*3*mesh->totface, "StrandSurfFaceEnv");
faceindirect= MEM_callocN(sizeof(float)*3*mesh->totface, "StrandSurfFaceIndirect");
totthread= (mesh->totface > 10000)? re->r.threads: 1;
totface= mesh->totface/totthread;
for(a=0; a<totthread; a++) {
othreads[a].re= re;
othreads[a].faceao= faceao;
othreads[a].faceenv= faceenv;
othreads[a].faceindirect= faceindirect;
othreads[a].thread= a;
othreads[a].mesh= mesh;
othreads[a].begin= a*totface;
othreads[a].end= (a == totthread-1)? mesh->totface: (a+1)*totface;
}
if(totthread == 1) {
exec_strandsurface_sample(&othreads[0]);
}
else {
BLI_init_threads(&threads, exec_strandsurface_sample, totthread);
for(a=0; a<totthread; a++)
BLI_insert_thread(&threads, &othreads[a]);
BLI_end_threads(&threads);
}
for(a=0; a<mesh->totface; a++) {
face= mesh->face[a];
copy_v3_v3(ao, faceao[a]);
copy_v3_v3(env, faceenv[a]);
copy_v3_v3(indirect, faceindirect[a]);
add_v3_v3(mesh->ao[face[0]], ao);
add_v3_v3(mesh->env[face[0]], env);
add_v3_v3(mesh->indirect[face[0]], indirect);
count[face[0]]++;
add_v3_v3(mesh->ao[face[1]], ao);
add_v3_v3(mesh->env[face[1]], env);
add_v3_v3(mesh->indirect[face[1]], indirect);
count[face[1]]++;
add_v3_v3(mesh->ao[face[2]], ao);
add_v3_v3(mesh->env[face[2]], env);
add_v3_v3(mesh->indirect[face[2]], indirect);
count[face[2]]++;
if(face[3]) {
add_v3_v3(mesh->ao[face[3]], ao);
add_v3_v3(mesh->env[face[3]], env);
add_v3_v3(mesh->indirect[face[3]], indirect);
count[face[3]]++;
}
}
for(a=0; a<mesh->totvert; a++) {
if(count[a]) {
mul_v3_fl(mesh->ao[a], 1.0f/count[a]);
mul_v3_fl(mesh->env[a], 1.0f/count[a]);
mul_v3_fl(mesh->indirect[a], 1.0f/count[a]);
}
}
MEM_freeN(count);
MEM_freeN(faceao);
MEM_freeN(faceenv);
MEM_freeN(faceindirect);
}
}
}
void free_occ(Render *re)
{
if(re->occlusiontree) {
occ_free_tree(re->occlusiontree);
re->occlusiontree = NULL;
}
}
void sample_occ(Render *re, ShadeInput *shi)
{
OcclusionTree *tree= re->occlusiontree;
OcclusionCache *cache;
OcclusionCacheSample *sample;
OccFace exclude;
int onlyshadow;
if(tree) {
if(shi->strand) {
sample_occ_surface(shi);
}
/* try to get result from the cache if possible */
else if(shi->depth!=0 || !sample_occ_cache(tree, shi->co, shi->vno, shi->xs, shi->ys, shi->thread, shi->ao, shi->env, shi->indirect)) {
/* no luck, let's sample the occlusion */
exclude.obi= shi->obi - re->objectinstance;
exclude.facenr= shi->vlr->index;
onlyshadow= (shi->mat->mode & MA_ONLYSHADOW);
sample_occ_tree(re, tree, &exclude, shi->co, shi->vno, shi->thread, onlyshadow, shi->ao, shi->env, shi->indirect);
/* fill result into sample, each time */
if(tree->cache) {
cache= &tree->cache[shi->thread];
if(cache->sample && cache->step) {
sample= &cache->sample[(shi->ys-cache->y)*cache->w + (shi->xs-cache->x)];
copy_v3_v3(sample->co, shi->co);
copy_v3_v3(sample->n, shi->vno);
copy_v3_v3(sample->ao, shi->ao);
copy_v3_v3(sample->env, shi->env);
copy_v3_v3(sample->indirect, shi->indirect);
sample->intensity= MAX3(sample->ao[0], sample->ao[1], sample->ao[2]);
sample->intensity= MAX2(sample->intensity, MAX3(sample->env[0], sample->env[1], sample->env[2]));
sample->intensity= MAX2(sample->intensity, MAX3(sample->indirect[0], sample->indirect[1], sample->indirect[2]));
sample->dist2= dot_v3v3(shi->dxco, shi->dxco) + dot_v3v3(shi->dyco, shi->dyco);
sample->filled= 1;
}
}
}
}
else {
shi->ao[0]= 1.0f;
shi->ao[1]= 1.0f;
shi->ao[2]= 1.0f;
shi->env[0]= 0.0f;
shi->env[1]= 0.0f;
shi->env[2]= 0.0f;
shi->indirect[0]= 0.0f;
shi->indirect[1]= 0.0f;
shi->indirect[2]= 0.0f;
}
}
void cache_occ_samples(Render *re, RenderPart *pa, ShadeSample *ssamp)
{
OcclusionTree *tree= re->occlusiontree;
PixStr ps;
OcclusionCache *cache;
OcclusionCacheSample *sample;
OccFace exclude;
ShadeInput *shi;
intptr_t *rd=NULL;
int *ro=NULL, *rp=NULL, *rz=NULL, onlyshadow;
int x, y, step = CACHE_STEP;
if(!tree->cache)
return;
cache= &tree->cache[pa->thread];
cache->w= pa->rectx;
cache->h= pa->recty;
cache->x= pa->disprect.xmin;
cache->y= pa->disprect.ymin;
cache->step= step;
cache->sample= MEM_callocN(sizeof(OcclusionCacheSample)*cache->w*cache->h, "OcclusionCacheSample");
sample= cache->sample;
if(re->osa) {
rd= pa->rectdaps;
}
else {
/* fake pixel struct for non-osa */
ps.next= NULL;
ps.mask= 0xFFFF;
ro= pa->recto;
rp= pa->rectp;
rz= pa->rectz;
}
/* compute a sample at every step pixels */
for(y=pa->disprect.ymin; y<pa->disprect.ymax; y++) {
for(x=pa->disprect.xmin; x<pa->disprect.xmax; x++, sample++, rd++, ro++, rp++, rz++) {
if(!(((x - pa->disprect.xmin + step) % step) == 0 || x == pa->disprect.xmax-1))
continue;
if(!(((y - pa->disprect.ymin + step) % step) == 0 || y == pa->disprect.ymax-1))
continue;
if(re->osa) {
if(!*rd) continue;
shade_samples_fill_with_ps(ssamp, (PixStr *)(*rd), x, y);
}
else {
if(!*rp) continue;
ps.obi= *ro;
ps.facenr= *rp;
ps.z= *rz;
shade_samples_fill_with_ps(ssamp, &ps, x, y);
}
shi= ssamp->shi;
if(shi->vlr) {
onlyshadow= (shi->mat->mode & MA_ONLYSHADOW);
exclude.obi= shi->obi - re->objectinstance;
exclude.facenr= shi->vlr->index;
sample_occ_tree(re, tree, &exclude, shi->co, shi->vno, shi->thread, onlyshadow, shi->ao, shi->env, shi->indirect);
copy_v3_v3(sample->co, shi->co);
copy_v3_v3(sample->n, shi->vno);
copy_v3_v3(sample->ao, shi->ao);
copy_v3_v3(sample->env, shi->env);
copy_v3_v3(sample->indirect, shi->indirect);
sample->intensity= MAX3(sample->ao[0], sample->ao[1], sample->ao[2]);
sample->intensity= MAX2(sample->intensity, MAX3(sample->env[0], sample->env[1], sample->env[2]));
sample->intensity= MAX2(sample->intensity, MAX3(sample->indirect[0], sample->indirect[1], sample->indirect[2]));
sample->dist2= dot_v3v3(shi->dxco, shi->dxco) + dot_v3v3(shi->dyco, shi->dyco);
sample->x= shi->xs;
sample->y= shi->ys;
sample->filled= 1;
}
if(re->test_break(re->tbh))
break;
}
}
}
void free_occ_samples(Render *re, RenderPart *pa)
{
OcclusionTree *tree= re->occlusiontree;
OcclusionCache *cache;
if(tree->cache) {
cache= &tree->cache[pa->thread];
if(cache->sample)
MEM_freeN(cache->sample);
cache->w= 0;
cache->h= 0;
cache->step= 0;
}
}
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