Merge with trunk r39928
[blender-staging.git] / source / blender / render / intern / source / shadeoutput.c
1 /*
2 * $Id$
3  *
4  * ***** BEGIN GPL LICENSE BLOCK *****
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version 2
9  * of the License, or (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software Foundation,
18  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
19  *
20  * The Original Code is Copyright (C) 2006 Blender Foundation
21  * All rights reserved.
22  *
23  * Contributors: Hos, Robert Wenzlaff.
24  *
25  * ***** END GPL LICENSE BLOCK *****
26  */
27
28 /** \file blender/render/intern/source/shadeoutput.c
29  *  \ingroup render
30  */
31
32
33 #include <stdio.h>
34 #include <float.h>
35 #include <math.h>
36 #include <string.h>
37
38 #include "BLI_math.h"
39 #include "BLI_utildefines.h"
40
41 #include "BKE_colortools.h"
42 #include "BKE_material.h"
43 #include "BKE_texture.h"
44
45
46 #include "DNA_group_types.h"
47 #include "DNA_lamp_types.h"
48 #include "DNA_material_types.h"
49
50 /* local include */
51 #include "occlusion.h"
52 #include "renderpipeline.h"
53 #include "render_types.h"
54 #include "pixelblending.h"
55 #include "rendercore.h"
56 #include "shadbuf.h"
57 #include "sss.h"
58 #include "texture.h"
59
60 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
61 /* defined in pipeline.c, is hardcopy of active dynamic allocated Render */
62 /* only to be used here in this file, it's for speed */
63 extern struct Render R;
64 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
65
66 ListBase *get_lights(ShadeInput *shi)
67 {
68         
69         if(R.r.scemode & R_PREVIEWBUTS)
70                 return &R.lights;
71         if(shi->light_override)
72                 return &shi->light_override->gobject;
73         if(shi->mat && shi->mat->group)
74                 return &shi->mat->group->gobject;
75         
76         return &R.lights;
77 }
78
79 #if 0
80 static void fogcolor(float *colf, float *rco, float *view)
81 {
82         float alpha, stepsize, startdist, dist, hor[4], zen[3], vec[3], dview[3];
83         float div=0.0f, distfac;
84         
85         hor[0]= R.wrld.horr; hor[1]= R.wrld.horg; hor[2]= R.wrld.horb;
86         zen[0]= R.wrld.zenr; zen[1]= R.wrld.zeng; zen[2]= R.wrld.zenb;
87         
88         VECCOPY(vec, rco);
89         
90         /* we loop from cur coord to mist start in steps */
91         stepsize= 1.0f;
92         
93         div= ABS(view[2]);
94         dview[0]= view[0]/(stepsize*div);
95         dview[1]= view[1]/(stepsize*div);
96         dview[2]= -stepsize;
97
98         startdist= -rco[2] + BLI_frand();
99         for(dist= startdist; dist>R.wrld.miststa; dist-= stepsize) {
100                 
101                 hor[0]= R.wrld.horr; hor[1]= R.wrld.horg; hor[2]= R.wrld.horb;
102                 alpha= 1.0f;
103                 do_sky_tex(vec, vec, NULL, hor, zen, &alpha);
104                 
105                 distfac= (dist-R.wrld.miststa)/R.wrld.mistdist;
106                 
107                 hor[3]= hor[0]*distfac*distfac;
108                 
109                 /* premul! */
110                 alpha= hor[3];
111                 hor[0]= hor[0]*alpha;
112                 hor[1]= hor[1]*alpha;
113                 hor[2]= hor[2]*alpha;
114                 addAlphaOverFloat(colf, hor);
115                 
116                 VECSUB(vec, vec, dview);
117         }       
118 }
119 #endif
120
121 /* zcor is distance, co the 3d coordinate in eye space, return alpha */
122 float mistfactor(float zcor, float *co) 
123 {
124         float fac, hi;
125         
126         fac= zcor - R.wrld.miststa;     /* zcor is calculated per pixel */
127
128         /* fac= -co[2]-R.wrld.miststa; */
129
130         if(fac>0.0f) {
131                 if(fac< R.wrld.mistdist) {
132                         
133                         fac= (fac/(R.wrld.mistdist));
134                         
135                         if(R.wrld.mistype==0) fac*= fac;
136                         else if(R.wrld.mistype==1);
137                         else fac= sqrt(fac);
138                 }
139                 else fac= 1.0f;
140         }
141         else fac= 0.0f;
142         
143         /* height switched off mist */
144         if(R.wrld.misthi!=0.0f && fac!=0.0f) {
145                 /* at height misthi the mist is completely gone */
146
147                 hi= R.viewinv[0][2]*co[0]+R.viewinv[1][2]*co[1]+R.viewinv[2][2]*co[2]+R.viewinv[3][2];
148                 
149                 if(hi>R.wrld.misthi) fac= 0.0f;
150                 else if(hi>0.0f) {
151                         hi= (R.wrld.misthi-hi)/R.wrld.misthi;
152                         fac*= hi*hi;
153                 }
154         }
155
156         return (1.0f-fac)* (1.0f-R.wrld.misi);  
157 }
158
159 static void spothalo(struct LampRen *lar, ShadeInput *shi, float *intens)
160 {
161         double a, b, c, disc, nray[3], npos[3];
162         double t0, t1 = 0.0f, t2= 0.0f, t3;
163         float p1[3], p2[3], ladist, maxz = 0.0f, maxy = 0.0f, haint;
164         int snijp, doclip=1, use_yco=0;
165         int ok1=0, ok2=0;
166         
167         *intens= 0.0f;
168         haint= lar->haint;
169         
170         if(R.r.mode & R_ORTHO) {
171                 /* camera pos (view vector) cannot be used... */
172                 /* camera position (cox,coy,0) rotate around lamp */
173                 p1[0]= shi->co[0]-lar->co[0];
174                 p1[1]= shi->co[1]-lar->co[1];
175                 p1[2]= -lar->co[2];
176                 mul_m3_v3(lar->imat, p1);
177                 VECCOPY(npos, p1);      // npos is double!
178                 
179                 /* pre-scale */
180                 npos[2]*= lar->sh_zfac;
181         }
182         else {
183                 VECCOPY(npos, lar->sh_invcampos);       /* in initlamp calculated */
184         }
185         
186         /* rotate view */
187         VECCOPY(nray, shi->view);
188         mul_m3_v3_double(lar->imat, nray);
189         
190         if(R.wrld.mode & WO_MIST) {
191                 /* patchy... */
192                 haint *= mistfactor(-lar->co[2], lar->co);
193                 if(haint==0.0f) {
194                         return;
195                 }
196         }
197
198
199         /* rotate maxz */
200         if(shi->co[2]==0.0f) doclip= 0; /* for when halo at sky */
201         else {
202                 p1[0]= shi->co[0]-lar->co[0];
203                 p1[1]= shi->co[1]-lar->co[1];
204                 p1[2]= shi->co[2]-lar->co[2];
205         
206                 maxz= lar->imat[0][2]*p1[0]+lar->imat[1][2]*p1[1]+lar->imat[2][2]*p1[2];
207                 maxz*= lar->sh_zfac;
208                 maxy= lar->imat[0][1]*p1[0]+lar->imat[1][1]*p1[1]+lar->imat[2][1]*p1[2];
209
210                 if( fabs(nray[2]) < FLT_EPSILON ) use_yco= 1;
211         }
212         
213         /* scale z to make sure volume is normalized */ 
214         nray[2]*= lar->sh_zfac;
215         /* nray does not need normalization */
216         
217         ladist= lar->sh_zfac*lar->dist;
218         
219         /* solve */
220         a = nray[0] * nray[0] + nray[1] * nray[1] - nray[2]*nray[2];
221         b = nray[0] * npos[0] + nray[1] * npos[1] - nray[2]*npos[2];
222         c = npos[0] * npos[0] + npos[1] * npos[1] - npos[2]*npos[2];
223
224         snijp= 0;
225         if (fabs(a) < DBL_EPSILON) {
226                 /*
227                  * Only one intersection point...
228                  */
229                 return;
230         }
231         else {
232                 disc = b*b - a*c;
233                 
234                 if(disc==0.0) {
235                         t1=t2= (-b)/ a;
236                         snijp= 2;
237                 }
238                 else if (disc > 0.0) {
239                         disc = sqrt(disc);
240                         t1 = (-b + disc) / a;
241                         t2 = (-b - disc) / a;
242                         snijp= 2;
243                 }
244         }
245         if(snijp==2) {
246                 /* sort */
247                 if(t1>t2) {
248                         a= t1; t1= t2; t2= a;
249                 }
250
251                 /* z of intersection points with diabolo */
252                 p1[2]= npos[2] + t1*nray[2];
253                 p2[2]= npos[2] + t2*nray[2];
254
255                 /* evaluate both points */
256                 if(p1[2]<=0.0f) ok1= 1;
257                 if(p2[2]<=0.0f && t1!=t2) ok2= 1;
258                 
259                 /* at least 1 point with negative z */
260                 if(ok1==0 && ok2==0) return;
261                 
262                 /* intersction point with -ladist, the bottom of the cone */
263                 if(use_yco==0) {
264                         t3= (-ladist-npos[2])/nray[2];
265                                 
266                         /* de we have to replace one of the intersection points? */
267                         if(ok1) {
268                                 if(p1[2]<-ladist) t1= t3;
269                         }
270                         else {
271                                 ok1= 1;
272                                 t1= t3;
273                         }
274                         if(ok2) {
275                                 if(p2[2]<-ladist) t2= t3;
276                         }
277                         else {
278                                 ok2= 1;
279                                 t2= t3;
280                         }
281                 }
282                 else if(ok1==0 || ok2==0) return;
283                 
284                 /* at least 1 visible interesction point */
285                 if(t1<0.0 && t2<0.0) return;
286                 
287                 if(t1<0.0) t1= 0.0;
288                 if(t2<0.0) t2= 0.0;
289                 
290                 if(t1==t2) return;
291                 
292                 /* sort again to be sure */
293                 if(t1>t2) {
294                         a= t1; t1= t2; t2= a;
295                 }
296                 
297                 /* calculate t0: is the maximum visible z (when halo is intersected by face) */ 
298                 if(doclip) {
299                         if(use_yco==0) t0= (maxz-npos[2])/nray[2];
300                         else t0= (maxy-npos[1])/nray[1];
301
302                         if(t0<t1) return;
303                         if(t0<t2) t2= t0;
304                 }
305
306                 /* calc points */
307                 p1[0]= npos[0] + t1*nray[0];
308                 p1[1]= npos[1] + t1*nray[1];
309                 p1[2]= npos[2] + t1*nray[2];
310                 p2[0]= npos[0] + t2*nray[0];
311                 p2[1]= npos[1] + t2*nray[1];
312                 p2[2]= npos[2] + t2*nray[2];
313                 
314                         
315                 /* now we have 2 points, make three lengths with it */
316                 
317                 a= sqrt(p1[0]*p1[0]+p1[1]*p1[1]+p1[2]*p1[2]);
318                 b= sqrt(p2[0]*p2[0]+p2[1]*p2[1]+p2[2]*p2[2]);
319                 c= len_v3v3(p1, p2);
320                 
321                 a/= ladist;
322                 a= sqrt(a);
323                 b/= ladist; 
324                 b= sqrt(b);
325                 c/= ladist;
326                 
327                 *intens= c*( (1.0-a)+(1.0-b) );
328
329                 /* WATCH IT: do not clip a,b en c at 1.0, this gives nasty little overflows
330                         at the edges (especially with narrow halos) */
331                 if(*intens<=0.0f) return;
332
333                 /* soft area */
334                 /* not needed because t0 has been used for p1/p2 as well */
335                 /* if(doclip && t0<t2) { */
336                 /*      *intens *= (t0-t1)/(t2-t1); */
337                 /* } */
338                 
339                 *intens *= haint;
340                 
341                 if(lar->shb && lar->shb->shadhalostep) {
342                         *intens *= shadow_halo(lar, p1, p2);
343                 }
344                 
345         }
346 }
347
348 void renderspothalo(ShadeInput *shi, float *col, float alpha)
349 {
350         ListBase *lights;
351         GroupObject *go;
352         LampRen *lar;
353         float i;
354         
355         if(alpha==0.0f) return;
356         
357         lights= get_lights(shi);
358         for(go=lights->first; go; go= go->next) {
359                 lar= go->lampren;
360                 if(lar==NULL) continue;
361                 
362                 if(lar->type==LA_SPOT && (lar->mode & LA_HALO) && (lar->buftype != LA_SHADBUF_DEEP) && lar->haint>0) {
363                         
364                         if(lar->mode & LA_LAYER) 
365                                 if(shi->vlr && (lar->lay & shi->obi->lay)==0) 
366                                         continue;
367                         if((lar->lay & shi->lay)==0) 
368                                 continue;
369                         
370                         spothalo(lar, shi, &i);
371                         if(i>0.0f) {
372                                 col[3]+= i*alpha;                       // all premul
373                                 col[0]+= i*lar->r*alpha;
374                                 col[1]+= i*lar->g*alpha;
375                                 col[2]+= i*lar->b*alpha;        
376                         }
377                 }
378         }
379         /* clip alpha, is needed for unified 'alpha threshold' (vanillaRenderPipe.c) */
380         if(col[3]>1.0f) col[3]= 1.0f;
381 }
382
383
384
385 /* ---------------- shaders ----------------------- */
386
387 static double Normalize_d(double *n)
388 {
389         double d;
390         
391         d= n[0]*n[0]+n[1]*n[1]+n[2]*n[2];
392
393         if(d>0.00000000000000001) {
394                 d= sqrt(d);
395
396                 n[0]/=d; 
397                 n[1]/=d; 
398                 n[2]/=d;
399         } else {
400                 n[0]=n[1]=n[2]= 0.0;
401                 d= 0.0;
402         }
403         return d;
404 }
405
406 /* mix of 'real' fresnel and allowing control. grad defines blending gradient */
407 float fresnel_fac(float *view, float *vn, float grad, float fac)
408 {
409         float t1, t2;
410         
411         if(fac==0.0f) return 1.0f;
412         
413         t1= (view[0]*vn[0] + view[1]*vn[1] + view[2]*vn[2]);
414         if(t1>0.0f)  t2= 1.0f+t1;
415         else t2= 1.0f-t1;
416         
417         t2= grad + (1.0f-grad)*pow(t2, fac);
418         
419         if(t2<0.0f) return 0.0f;
420         else if(t2>1.0f) return 1.0f;
421         return t2;
422 }
423
424 static double saacos_d(double fac)
425 {
426         if(fac<= -1.0) return M_PI;
427         else if(fac>=1.0) return 0.0;
428         else return acos(fac);
429 }
430
431 /* Stoke's form factor. Need doubles here for extreme small area sizes */
432 static float area_lamp_energy(float (*area)[3], float *co, float *vn)
433 {
434         double fac;
435         double vec[4][3];       /* vectors of rendered co to vertices lamp */
436         double cross[4][3];     /* cross products of this */
437         double rad[4];          /* angles between vecs */
438
439         VECSUB(vec[0], co, area[0]);
440         VECSUB(vec[1], co, area[1]);
441         VECSUB(vec[2], co, area[2]);
442         VECSUB(vec[3], co, area[3]);
443         
444         Normalize_d(vec[0]);
445         Normalize_d(vec[1]);
446         Normalize_d(vec[2]);
447         Normalize_d(vec[3]);
448
449         /* cross product */
450         CROSS(cross[0], vec[0], vec[1]);
451         CROSS(cross[1], vec[1], vec[2]);
452         CROSS(cross[2], vec[2], vec[3]);
453         CROSS(cross[3], vec[3], vec[0]);
454
455         Normalize_d(cross[0]);
456         Normalize_d(cross[1]);
457         Normalize_d(cross[2]);
458         Normalize_d(cross[3]);
459
460         /* angles */
461         rad[0]= vec[0][0]*vec[1][0]+ vec[0][1]*vec[1][1]+ vec[0][2]*vec[1][2];
462         rad[1]= vec[1][0]*vec[2][0]+ vec[1][1]*vec[2][1]+ vec[1][2]*vec[2][2];
463         rad[2]= vec[2][0]*vec[3][0]+ vec[2][1]*vec[3][1]+ vec[2][2]*vec[3][2];
464         rad[3]= vec[3][0]*vec[0][0]+ vec[3][1]*vec[0][1]+ vec[3][2]*vec[0][2];
465
466         rad[0]= saacos_d(rad[0]);
467         rad[1]= saacos_d(rad[1]);
468         rad[2]= saacos_d(rad[2]);
469         rad[3]= saacos_d(rad[3]);
470
471         /* Stoke formula */
472         fac=  rad[0]*(vn[0]*cross[0][0]+ vn[1]*cross[0][1]+ vn[2]*cross[0][2]);
473         fac+= rad[1]*(vn[0]*cross[1][0]+ vn[1]*cross[1][1]+ vn[2]*cross[1][2]);
474         fac+= rad[2]*(vn[0]*cross[2][0]+ vn[1]*cross[2][1]+ vn[2]*cross[2][2]);
475         fac+= rad[3]*(vn[0]*cross[3][0]+ vn[1]*cross[3][1]+ vn[2]*cross[3][2]);
476
477         if(fac<=0.0) return 0.0;
478         return fac;
479 }
480
481 static float area_lamp_energy_multisample(LampRen *lar, float *co, float *vn)
482 {
483         /* corner vectors are moved around according lamp jitter */
484         float *jitlamp= lar->jitter, vec[3];
485         float area[4][3], intens= 0.0f;
486         int a= lar->ray_totsamp;
487
488         /* test if co is behind lamp */
489         VECSUB(vec, co, lar->co);
490         if(INPR(vec, lar->vec) < 0.0f)
491                 return 0.0f;
492
493         while(a--) {
494                 vec[0]= jitlamp[0];
495                 vec[1]= jitlamp[1];
496                 vec[2]= 0.0f;
497                 mul_m3_v3(lar->mat, vec);
498                 
499                 VECADD(area[0], lar->area[0], vec);
500                 VECADD(area[1], lar->area[1], vec);
501                 VECADD(area[2], lar->area[2], vec);
502                 VECADD(area[3], lar->area[3], vec);
503                 
504                 intens+= area_lamp_energy(area, co, vn);
505                 
506                 jitlamp+= 2;
507         }
508         intens /= (float)lar->ray_totsamp;
509         
510         return pow(intens*lar->areasize, lar->k);       // corrected for buttons size and lar->dist^2
511 }
512
513 static float spec(float inp, int hard)  
514 {
515         float b1;
516         
517         if(inp>=1.0f) return 1.0f;
518         else if (inp<=0.0f) return 0.0f;
519         
520         b1= inp*inp;
521         /* avoid FPE */
522         if(b1<0.01f) b1= 0.01f; 
523         
524         if((hard & 1)==0)  inp= 1.0f;
525         if(hard & 2)  inp*= b1;
526         b1*= b1;
527         if(hard & 4)  inp*= b1;
528         b1*= b1;
529         if(hard & 8)  inp*= b1;
530         b1*= b1;
531         if(hard & 16) inp*= b1;
532         b1*= b1;
533
534         /* avoid FPE */
535         if(b1<0.001f) b1= 0.0f; 
536
537         if(hard & 32) inp*= b1;
538         b1*= b1;
539         if(hard & 64) inp*=b1;
540         b1*= b1;
541         if(hard & 128) inp*=b1;
542
543         if(b1<0.001f) b1= 0.0f; 
544
545         if(hard & 256) {
546                 b1*= b1;
547                 inp*=b1;
548         }
549
550         return inp;
551 }
552
553 static float Phong_Spec( float *n, float *l, float *v, int hard, int tangent )
554 {
555         float h[3];
556         float rslt;
557         
558         h[0] = l[0] + v[0];
559         h[1] = l[1] + v[1];
560         h[2] = l[2] + v[2];
561         normalize_v3(h);
562         
563         rslt = h[0]*n[0] + h[1]*n[1] + h[2]*n[2];
564         if(tangent) rslt= sasqrt(1.0f - rslt*rslt);
565                 
566         if( rslt > 0.0f ) rslt= spec(rslt, hard);
567         else rslt = 0.0f;
568         
569         return rslt;
570 }
571
572
573 /* reduced cook torrance spec (for off-specular peak) */
574 static float CookTorr_Spec(float *n, float *l, float *v, int hard, int tangent)
575 {
576         float i, nh, nv, h[3];
577
578         h[0]= v[0]+l[0];
579         h[1]= v[1]+l[1];
580         h[2]= v[2]+l[2];
581         normalize_v3(h);
582
583         nh= n[0]*h[0]+n[1]*h[1]+n[2]*h[2];
584         if(tangent) nh= sasqrt(1.0f - nh*nh);
585         else if(nh<0.0f) return 0.0f;
586         
587         nv= n[0]*v[0]+n[1]*v[1]+n[2]*v[2];
588         if(tangent) nv= sasqrt(1.0f - nv*nv);
589         else if(nv<0.0f) nv= 0.0f;
590
591         i= spec(nh, hard);
592
593         i= i/(0.1f+nv);
594         return i;
595 }
596
597 /* Blinn spec */
598 static float Blinn_Spec(float *n, float *l, float *v, float refrac, float spec_power, int tangent)
599 {
600         float i, nh, nv, nl, vh, h[3];
601         float a, b, c, g=0.0f, p, f, ang;
602
603         if(refrac < 1.0f) return 0.0f;
604         if(spec_power == 0.0f) return 0.0f;
605         
606         /* conversion from 'hardness' (1-255) to 'spec_power' (50 maps at 0.1) */
607         if(spec_power<100.0f)
608                 spec_power= sqrt(1.0f/spec_power);
609         else spec_power= 10.0f/spec_power;
610         
611         h[0]= v[0]+l[0];
612         h[1]= v[1]+l[1];
613         h[2]= v[2]+l[2];
614         normalize_v3(h);
615
616         nh= n[0]*h[0]+n[1]*h[1]+n[2]*h[2]; /* Dot product between surface normal and half-way vector */
617         if(tangent) nh= sasqrt(1.0f - nh*nh);
618         else if(nh<0.0f) return 0.0f;
619
620         nv= n[0]*v[0]+n[1]*v[1]+n[2]*v[2]; /* Dot product between surface normal and view vector */
621         if(tangent) nv= sasqrt(1.0f - nv*nv);
622         if(nv<=0.01f) nv= 0.01f;                                /* hrms... */
623
624         nl= n[0]*l[0]+n[1]*l[1]+n[2]*l[2]; /* Dot product between surface normal and light vector */
625         if(tangent) nl= sasqrt(1.0f - nl*nl);
626         if(nl<=0.01f) {
627                 return 0.0f;
628         }
629
630         vh= v[0]*h[0]+v[1]*h[1]+v[2]*h[2]; /* Dot product between view vector and half-way vector */
631         if(vh<=0.0f) vh= 0.01f;
632
633         a = 1.0f;
634         b = (2.0f*nh*nv)/vh;
635         c = (2.0f*nh*nl)/vh;
636
637         if( a < b && a < c ) g = a;
638         else if( b < a && b < c ) g = b;
639         else if( c < a && c < b ) g = c;
640
641         p = sqrt( (double)((refrac * refrac)+(vh*vh)-1.0f) );
642         f = (((p-vh)*(p-vh))/((p+vh)*(p+vh)))*(1+((((vh*(p+vh))-1.0f)*((vh*(p+vh))-1.0f))/(((vh*(p-vh))+1.0f)*((vh*(p-vh))+1.0f))));
643         ang = saacos(nh);
644
645         i= f * g * exp((double)(-(ang*ang) / (2.0f*spec_power*spec_power)));
646         if(i<0.0f) i= 0.0f;
647         
648         return i;
649 }
650
651 /* cartoon render spec */
652 static float Toon_Spec( float *n, float *l, float *v, float size, float smooth, int tangent)
653 {
654         float h[3];
655         float ang;
656         float rslt;
657         
658         h[0] = l[0] + v[0];
659         h[1] = l[1] + v[1];
660         h[2] = l[2] + v[2];
661         normalize_v3(h);
662         
663         rslt = h[0]*n[0] + h[1]*n[1] + h[2]*n[2];
664         if(tangent) rslt = sasqrt(1.0f - rslt*rslt);
665         
666         ang = saacos( rslt ); 
667         
668         if( ang < size ) rslt = 1.0f;
669         else if( ang >= (size + smooth) || smooth == 0.0f ) rslt = 0.0f;
670         else rslt = 1.0f - ((ang - size) / smooth);
671         
672         return rslt;
673 }
674
675 /* Ward isotropic gaussian spec */
676 static float WardIso_Spec( float *n, float *l, float *v, float rms, int tangent)
677 {
678         float i, nh, nv, nl, h[3], angle, alpha;
679
680
681         /* half-way vector */
682         h[0] = l[0] + v[0];
683         h[1] = l[1] + v[1];
684         h[2] = l[2] + v[2];
685         normalize_v3(h);
686
687         nh = n[0]*h[0]+n[1]*h[1]+n[2]*h[2]; /* Dot product between surface normal and half-way vector */
688         if(tangent) nh = sasqrt(1.0f - nh*nh);
689         if(nh<=0.0f) nh = 0.001f;
690         
691         nv = n[0]*v[0]+n[1]*v[1]+n[2]*v[2]; /* Dot product between surface normal and view vector */
692         if(tangent) nv = sasqrt(1.0f - nv*nv);
693         if(nv<=0.0f) nv = 0.001f;
694
695         nl = n[0]*l[0]+n[1]*l[1]+n[2]*l[2]; /* Dot product between surface normal and light vector */
696         if(tangent) nl = sasqrt(1.0f - nl*nl);
697         if(nl<=0.0f) nl = 0.001f;
698
699         angle = tan(saacos(nh));
700         alpha = MAX2(rms, 0.001f);
701
702         i= nl * (1.0f/(4.0f*M_PI*alpha*alpha)) * (exp( -(angle*angle)/(alpha*alpha))/(sqrt(nv*nl)));
703
704         return i;
705 }
706
707 /* cartoon render diffuse */
708 static float Toon_Diff( float *n, float *l, float *UNUSED(v), float size, float smooth )
709 {
710         float rslt, ang;
711
712         rslt = n[0]*l[0] + n[1]*l[1] + n[2]*l[2];
713
714         ang = saacos( (double)(rslt) );
715
716         if( ang < size ) rslt = 1.0f;
717         else if( ang >= (size + smooth) || smooth == 0.0f ) rslt = 0.0f;
718         else rslt = 1.0f - ((ang - size) / smooth);
719
720         return rslt;
721 }
722
723 /* Oren Nayar diffuse */
724
725 /* 'nl' is either dot product, or return value of area light */
726 /* in latter case, only last multiplication uses 'nl' */
727 static float OrenNayar_Diff(float nl, float *n, float *l, float *v, float rough )
728 {
729         float i/*, nh*/, nv, vh, realnl, h[3];
730         float a, b, t, A, B;
731         float Lit_A, View_A, Lit_B[3], View_B[3];
732         
733         h[0]= v[0]+l[0];
734         h[1]= v[1]+l[1];
735         h[2]= v[2]+l[2];
736         normalize_v3(h);
737         
738         /* nh= n[0]*h[0]+n[1]*h[1]+n[2]*h[2]; */ /* Dot product between surface normal and half-way vector */
739         /* if(nh<0.0f) nh = 0.0f; */
740         
741         nv= n[0]*v[0]+n[1]*v[1]+n[2]*v[2]; /* Dot product between surface normal and view vector */
742         if(nv<=0.0f) nv= 0.0f;
743         
744         realnl= n[0]*l[0]+n[1]*l[1]+n[2]*l[2]; /* Dot product between surface normal and light vector */
745         if(realnl<=0.0f) return 0.0f;
746         if(nl<0.0f) return 0.0f;                /* value from area light */
747         
748         vh= v[0]*h[0]+v[1]*h[1]+v[2]*h[2]; /* Dot product between view vector and halfway vector */
749         if(vh<=0.0f) vh= 0.0f;
750         
751         Lit_A = saacos(realnl);
752         View_A = saacos( nv );
753         
754         Lit_B[0] = l[0] - (realnl * n[0]);
755         Lit_B[1] = l[1] - (realnl * n[1]);
756         Lit_B[2] = l[2] - (realnl * n[2]);
757         normalize_v3( Lit_B );
758         
759         View_B[0] = v[0] - (nv * n[0]);
760         View_B[1] = v[1] - (nv * n[1]);
761         View_B[2] = v[2] - (nv * n[2]);
762         normalize_v3( View_B );
763         
764         t = Lit_B[0]*View_B[0] + Lit_B[1]*View_B[1] + Lit_B[2]*View_B[2];
765         if( t < 0 ) t = 0;
766         
767         if( Lit_A > View_A ) {
768                 a = Lit_A;
769                 b = View_A;
770         }
771         else {
772                 a = View_A;
773                 b = Lit_A;
774         }
775         
776         A = 1.0f - (0.5f * ((rough * rough) / ((rough * rough) + 0.33f)));
777         B = 0.45f * ((rough * rough) / ((rough * rough) + 0.09f));
778         
779         b*= 0.95f;      /* prevent tangens from shooting to inf, 'nl' can be not a dot product here. */
780                                 /* overflow only happens with extreme size area light, and higher roughness */
781         i = nl * ( A + ( B * t * sin(a) * tan(b) ) );
782         
783         return i;
784 }
785
786 /* Minnaert diffuse */
787 static float Minnaert_Diff(float nl, float *n, float *v, float darkness)
788 {
789
790         float i, nv;
791
792         /* nl = dot product between surface normal and light vector */
793         if (nl <= 0.0f)
794                 return 0.0f;
795
796         /* nv = dot product between surface normal and view vector */
797         nv = n[0]*v[0]+n[1]*v[1]+n[2]*v[2];
798         if (nv < 0.0f)
799                 nv = 0.0f;
800
801         if (darkness <= 1.0f)
802                 i = nl * pow(MAX2(nv*nl, 0.1f), (darkness - 1.0f) ); /*The Real model*/
803         else
804                 i = nl * pow( (1.001f - nv), (darkness  - 1.0f) ); /*Nvidia model*/
805
806         return i;
807 }
808
809 static float Fresnel_Diff(float *vn, float *lv, float *UNUSED(view), float fac_i, float fac)
810 {
811         return fresnel_fac(lv, vn, fac_i, fac);
812 }
813
814 /* --------------------------------------------- */
815 /* also called from texture.c */
816 void calc_R_ref(ShadeInput *shi)
817 {
818         float i;
819
820         /* shi->vn dot shi->view */
821         i= -2*(shi->vn[0]*shi->view[0]+shi->vn[1]*shi->view[1]+shi->vn[2]*shi->view[2]);
822
823         shi->ref[0]= (shi->view[0]+i*shi->vn[0]);
824         shi->ref[1]= (shi->view[1]+i*shi->vn[1]);
825         shi->ref[2]= (shi->view[2]+i*shi->vn[2]);
826         if(shi->osatex) {
827                 if(shi->vlr->flag & R_SMOOTH) {
828                         i= -2*( (shi->vn[0]+shi->dxno[0])*(shi->view[0]+shi->dxview) +
829                                 (shi->vn[1]+shi->dxno[1])*shi->view[1]+ (shi->vn[2]+shi->dxno[2])*shi->view[2] );
830
831                         shi->dxref[0]= shi->ref[0]- ( shi->view[0]+shi->dxview+i*(shi->vn[0]+shi->dxno[0]));
832                         shi->dxref[1]= shi->ref[1]- (shi->view[1]+ i*(shi->vn[1]+shi->dxno[1]));
833                         shi->dxref[2]= shi->ref[2]- (shi->view[2]+ i*(shi->vn[2]+shi->dxno[2]));
834
835                         i= -2*( (shi->vn[0]+shi->dyno[0])*shi->view[0]+
836                                 (shi->vn[1]+shi->dyno[1])*(shi->view[1]+shi->dyview)+ (shi->vn[2]+shi->dyno[2])*shi->view[2] );
837
838                         shi->dyref[0]= shi->ref[0]- (shi->view[0]+ i*(shi->vn[0]+shi->dyno[0]));
839                         shi->dyref[1]= shi->ref[1]- (shi->view[1]+shi->dyview+i*(shi->vn[1]+shi->dyno[1]));
840                         shi->dyref[2]= shi->ref[2]- (shi->view[2]+ i*(shi->vn[2]+shi->dyno[2]));
841
842                 }
843                 else {
844
845                         i= -2*( shi->vn[0]*(shi->view[0]+shi->dxview) +
846                                 shi->vn[1]*shi->view[1]+ shi->vn[2]*shi->view[2] );
847
848                         shi->dxref[0]= shi->ref[0]- (shi->view[0]+shi->dxview+i*shi->vn[0]);
849                         shi->dxref[1]= shi->ref[1]- (shi->view[1]+ i*shi->vn[1]);
850                         shi->dxref[2]= shi->ref[2]- (shi->view[2]+ i*shi->vn[2]);
851
852                         i= -2*( shi->vn[0]*shi->view[0]+
853                                 shi->vn[1]*(shi->view[1]+shi->dyview)+ shi->vn[2]*shi->view[2] );
854
855                         shi->dyref[0]= shi->ref[0]- (shi->view[0]+ i*shi->vn[0]);
856                         shi->dyref[1]= shi->ref[1]- (shi->view[1]+shi->dyview+i*shi->vn[1]);
857                         shi->dyref[2]= shi->ref[2]- (shi->view[2]+ i*shi->vn[2]);
858                 }
859         }
860
861 }
862
863 /* called from ray.c */
864 void shade_color(ShadeInput *shi, ShadeResult *shr)
865 {
866         Material *ma= shi->mat;
867
868         if(ma->mode & (MA_FACETEXTURE)) {
869                 shi->r= shi->vcol[0];
870                 shi->g= shi->vcol[1];
871                 shi->b= shi->vcol[2];
872                 if(ma->mode & (MA_FACETEXTURE_ALPHA))
873                         shi->alpha= shi->vcol[3];
874         }
875         else if(ma->mode & (MA_VERTEXCOLP)) {
876                 float inv_alpha = 1.0f - shi->vcol[3];
877                 shi->r= shi->r*inv_alpha + shi->vcol[0]*shi->vcol[3];
878                 shi->g= shi->g*inv_alpha + shi->vcol[1]*shi->vcol[3];
879                 shi->b= shi->b*inv_alpha + shi->vcol[2]*shi->vcol[3];
880         }
881         
882         if(ma->texco)
883                 do_material_tex(shi);
884
885         if(ma->fresnel_tra!=0.0f) 
886                 shi->alpha*= fresnel_fac(shi->view, shi->vn, ma->fresnel_tra_i, ma->fresnel_tra);
887         
888         if (!(shi->mode & MA_TRANSP)) shi->alpha= 1.0f;
889         
890         shr->diff[0]= shi->r;
891         shr->diff[1]= shi->g;
892         shr->diff[2]= shi->b;
893         shr->alpha= shi->alpha;
894 }
895
896 /* ramp for at end of shade */
897 static void ramp_diffuse_result(float *diff, ShadeInput *shi)
898 {
899         Material *ma= shi->mat;
900         float col[4], fac=0;
901
902         if(ma->ramp_col) {
903                 if(ma->rampin_col==MA_RAMP_IN_RESULT) {
904                         
905                         fac= 0.3f*diff[0] + 0.58f*diff[1] + 0.12f*diff[2];
906                         do_colorband(ma->ramp_col, fac, col);
907                         
908                         /* blending method */
909                         fac= col[3]*ma->rampfac_col;
910                         
911                         ramp_blend(ma->rampblend_col, diff, diff+1, diff+2, fac, col);
912                 }
913         }
914 }
915
916 /* r,g,b denote energy, ramp is used with different values to make new material color */
917 static void add_to_diffuse(float *diff, ShadeInput *shi, float is, float r, float g, float b)
918 {
919         Material *ma= shi->mat;
920         float col[4], colt[3], fac=0;
921         
922         if(ma->ramp_col && (ma->mode & MA_RAMP_COL)) {
923                 
924                 /* MA_RAMP_IN_RESULT is exceptional */
925                 if(ma->rampin_col==MA_RAMP_IN_RESULT) {
926                         // normal add
927                         diff[0] += r * shi->r;
928                         diff[1] += g * shi->g;
929                         diff[2] += b * shi->b;
930                 }
931                 else {
932                         /* input */
933                         switch(ma->rampin_col) {
934                         case MA_RAMP_IN_ENERGY:
935                                 fac= 0.3f*r + 0.58f*g + 0.12f*b;
936                                 break;
937                         case MA_RAMP_IN_SHADER:
938                                 fac= is;
939                                 break;
940                         case MA_RAMP_IN_NOR:
941                                 fac= shi->view[0]*shi->vn[0] + shi->view[1]*shi->vn[1] + shi->view[2]*shi->vn[2];
942                                 break;
943                         }
944         
945                         do_colorband(ma->ramp_col, fac, col);
946                         
947                         /* blending method */
948                         fac= col[3]*ma->rampfac_col;
949                         colt[0]= shi->r;
950                         colt[1]= shi->g;
951                         colt[2]= shi->b;
952
953                         ramp_blend(ma->rampblend_col, colt, colt+1, colt+2, fac, col);
954
955                         /* output to */
956                         diff[0] += r * colt[0];
957                         diff[1] += g * colt[1];
958                         diff[2] += b * colt[2];
959                 }
960         }
961         else {
962                 diff[0] += r * shi->r;
963                 diff[1] += g * shi->g;
964                 diff[2] += b * shi->b;
965         }
966 }
967
968 static void ramp_spec_result(float *specr, float *specg, float *specb, ShadeInput *shi)
969 {
970         Material *ma= shi->mat;
971         float col[4];
972         float fac;
973         
974         if(ma->ramp_spec && (ma->rampin_spec==MA_RAMP_IN_RESULT)) {
975                 fac= 0.3f*(*specr) + 0.58f*(*specg) + 0.12f*(*specb);
976                 do_colorband(ma->ramp_spec, fac, col);
977                 
978                 /* blending method */
979                 fac= col[3]*ma->rampfac_spec;
980                 
981                 ramp_blend(ma->rampblend_spec, specr, specg, specb, fac, col);
982                 
983         }
984 }
985
986 /* is = dot product shade, t = spec energy */
987 static void do_specular_ramp(ShadeInput *shi, float is, float t, float *spec)
988 {
989         Material *ma= shi->mat;
990         float col[4];
991         float fac=0.0f;
992         
993         spec[0]= shi->specr;
994         spec[1]= shi->specg;
995         spec[2]= shi->specb;
996
997         /* MA_RAMP_IN_RESULT is exception */
998         if(ma->ramp_spec && (ma->rampin_spec!=MA_RAMP_IN_RESULT)) {
999                 
1000                 /* input */
1001                 switch(ma->rampin_spec) {
1002                 case MA_RAMP_IN_ENERGY:
1003                         fac= t;
1004                         break;
1005                 case MA_RAMP_IN_SHADER:
1006                         fac= is;
1007                         break;
1008                 case MA_RAMP_IN_NOR:
1009                         fac= shi->view[0]*shi->vn[0] + shi->view[1]*shi->vn[1] + shi->view[2]*shi->vn[2];
1010                         break;
1011                 }
1012                 
1013                 do_colorband(ma->ramp_spec, fac, col);
1014                 
1015                 /* blending method */
1016                 fac= col[3]*ma->rampfac_spec;
1017                 
1018                 ramp_blend(ma->rampblend_spec, spec, spec+1, spec+2, fac, col);
1019         }
1020 }
1021
1022 /* pure AO, check for raytrace and world should have been done */
1023 /* preprocess, textures were not done, don't use shi->amb for that reason */
1024 void ambient_occlusion(ShadeInput *shi)
1025 {
1026         if((R.wrld.ao_gather_method == WO_AOGATHER_APPROX) && shi->mat->amb!=0.0f)
1027                 sample_occ(&R, shi);
1028         else if((R.r.mode & R_RAYTRACE) && shi->mat->amb!=0.0f)
1029                 ray_ao(shi, shi->ao, shi->env);
1030         else
1031                 shi->ao[0]= shi->ao[1]= shi->ao[2]= 1.0f;
1032 }
1033
1034
1035 /* wrld mode was checked for */
1036 static void ambient_occlusion_apply(ShadeInput *shi, ShadeResult *shr)
1037 {
1038         float f= R.wrld.aoenergy;
1039         float tmp[3], tmpspec[3];
1040
1041         if(!((R.r.mode & R_RAYTRACE) || R.wrld.ao_gather_method == WO_AOGATHER_APPROX))
1042                 return;
1043         if(f == 0.0f)
1044                 return;
1045
1046         if(R.wrld.aomix==WO_AOADD) {
1047                 shr->combined[0] += shi->ao[0]*shi->r*shi->refl*f;
1048                 shr->combined[1] += shi->ao[1]*shi->g*shi->refl*f;
1049                 shr->combined[2] += shi->ao[2]*shi->b*shi->refl*f;
1050         }
1051         else if(R.wrld.aomix==WO_AOMUL) {
1052                 mul_v3_v3v3(tmp, shr->combined, shi->ao);
1053                 mul_v3_v3v3(tmpspec, shr->spec, shi->ao);
1054
1055                 if(f == 1.0f) {
1056                         copy_v3_v3(shr->combined, tmp);
1057                         copy_v3_v3(shr->spec, tmpspec);
1058                 }
1059                 else {
1060                         interp_v3_v3v3(shr->combined, shr->combined, tmp, f);
1061                         interp_v3_v3v3(shr->spec, shr->spec, tmpspec, f);
1062                 }
1063         }
1064 }
1065
1066 void environment_lighting_apply(ShadeInput *shi, ShadeResult *shr)
1067 {
1068         float f= R.wrld.ao_env_energy*shi->amb;
1069
1070         if(!((R.r.mode & R_RAYTRACE) || R.wrld.ao_gather_method == WO_AOGATHER_APPROX))
1071                 return;
1072         if(f == 0.0f)
1073                 return;
1074         
1075         shr->combined[0] += shi->env[0]*shi->r*shi->refl*f;
1076         shr->combined[1] += shi->env[1]*shi->g*shi->refl*f;
1077         shr->combined[2] += shi->env[2]*shi->b*shi->refl*f;
1078 }
1079
1080 static void indirect_lighting_apply(ShadeInput *shi, ShadeResult *shr)
1081 {
1082         float f= R.wrld.ao_indirect_energy;
1083
1084         if(!((R.r.mode & R_RAYTRACE) || R.wrld.ao_gather_method == WO_AOGATHER_APPROX))
1085                 return;
1086         if(f == 0.0f)
1087                 return;
1088
1089         shr->combined[0] += shi->indirect[0]*shi->r*shi->refl*f;
1090         shr->combined[1] += shi->indirect[1]*shi->g*shi->refl*f;
1091         shr->combined[2] += shi->indirect[2]*shi->b*shi->refl*f;
1092 }
1093
1094 /* result written in shadfac */
1095 void lamp_get_shadow(LampRen *lar, ShadeInput *shi, float inp, float *shadfac, int do_real)
1096 {
1097         LampShadowSubSample *lss= &(lar->shadsamp[shi->thread].s[shi->sample]);
1098         
1099         if(do_real || lss->samplenr!=shi->samplenr) {
1100                 
1101                 shadfac[0]= shadfac[1]= shadfac[2]= shadfac[3]= 1.0f;
1102                 
1103                 if(lar->shb) {
1104                         if(lar->buftype==LA_SHADBUF_IRREGULAR)
1105                                 shadfac[3]= ISB_getshadow(shi, lar->shb);
1106                         else
1107                                 shadfac[3] = testshadowbuf(&R, lar->shb, shi->co, shi->dxco, shi->dyco, inp, shi->mat->lbias);
1108                 }
1109                 else if(lar->mode & LA_SHAD_RAY) {
1110                         ray_shadow(shi, lar, shadfac);
1111                 }
1112                 
1113                 if(shi->depth==0) {
1114                         QUATCOPY(lss->shadfac, shadfac);
1115                         lss->samplenr= shi->samplenr;
1116                 }
1117         }
1118         else {
1119                 QUATCOPY(shadfac, lss->shadfac);
1120         }
1121 }
1122
1123 /* lampdistance and spot angle, writes in lv and dist */
1124 float lamp_get_visibility(LampRen *lar, float *co, float *lv, float *dist)
1125 {
1126         if(lar->type==LA_SUN || lar->type==LA_HEMI) {
1127                 *dist= 1.0f;
1128                 VECCOPY(lv, lar->vec);
1129                 return 1.0f;
1130         }
1131         else {
1132                 float visifac= 1.0f, t;
1133                 
1134                 VECSUB(lv, co, lar->co);
1135                 *dist= sqrt( INPR(lv, lv));
1136                 t= 1.0f/dist[0];
1137                 VECMUL(lv, t);
1138                 
1139                 /* area type has no quad or sphere option */
1140                 if(lar->type==LA_AREA) {
1141                         /* area is single sided */
1142                         //if(INPR(lv, lar->vec) > 0.0f)
1143                         //      visifac= 1.0f;
1144                         //else
1145                         //      visifac= 0.0f;
1146                 }
1147                 else {
1148                         switch(lar->falloff_type)
1149                         {
1150                                 case LA_FALLOFF_CONSTANT:
1151                                         visifac = 1.0f;
1152                                         break;
1153                                 case LA_FALLOFF_INVLINEAR:
1154                                         visifac = lar->dist/(lar->dist + dist[0]);
1155                                         break;
1156                                 case LA_FALLOFF_INVSQUARE:
1157                                         /* NOTE: This seems to be a hack since commit r12045 says this
1158                                          * option is similar to old Quad, but with slight changes.
1159                                          * Correct inv square would be (which would be old Quad):
1160                                          * visifac = lar->distkw / (lar->distkw + dist[0]*dist[0]);
1161                                          */
1162                                         visifac = lar->dist / (lar->dist + dist[0]*dist[0]);
1163                                         break;
1164                                 case LA_FALLOFF_SLIDERS:
1165                                         if(lar->ld1>0.0f)
1166                                                 visifac= lar->dist/(lar->dist+lar->ld1*dist[0]);
1167                                         if(lar->ld2>0.0f)
1168                                                 visifac*= lar->distkw/(lar->distkw+lar->ld2*dist[0]*dist[0]);
1169                                         break;
1170                                 case LA_FALLOFF_CURVE:
1171                                         visifac = curvemapping_evaluateF(lar->curfalloff, 0, dist[0]/lar->dist);
1172                                         break;
1173                         }
1174                         
1175                         if(lar->mode & LA_SPHERE) {
1176                                 float t= lar->dist - dist[0];
1177                                 if(t<=0.0f) 
1178                                         visifac= 0.0f;
1179                                 else
1180                                         visifac*= t/lar->dist;
1181                         }
1182                         
1183                         if(visifac > 0.0f) {
1184                                 if(lar->type==LA_SPOT) {
1185                                         float inpr;
1186                                         
1187                                         if(lar->mode & LA_SQUARE) {
1188                                                 if(lv[0]*lar->vec[0]+lv[1]*lar->vec[1]+lv[2]*lar->vec[2]>0.0f) {
1189                                                         float lvrot[3], x;
1190                                                         
1191                                                         /* rotate view to lampspace */
1192                                                         VECCOPY(lvrot, lv);
1193                                                         mul_m3_v3(lar->imat, lvrot);
1194                                                         
1195                                                         x= MAX2(fabs(lvrot[0]/lvrot[2]) , fabs(lvrot[1]/lvrot[2]));
1196                                                         /* 1.0f/(sqrt(1+x*x)) is equivalent to cos(atan(x)) */
1197                                                         
1198                                                         inpr= 1.0f/(sqrt(1.0f+x*x));
1199                                                 }
1200                                                 else inpr= 0.0f;
1201                                         }
1202                                         else {
1203                                                 inpr= lv[0]*lar->vec[0]+lv[1]*lar->vec[1]+lv[2]*lar->vec[2];
1204                                         }
1205                                         
1206                                         t= lar->spotsi;
1207                                         if(inpr<=t) 
1208                                                 visifac= 0.0f;
1209                                         else {
1210                                                 t= inpr-t;
1211                                                 if(t<lar->spotbl && lar->spotbl!=0.0f) {
1212                                                         /* soft area */
1213                                                         float i= t/lar->spotbl;
1214                                                         t= i*i;
1215                                                         inpr*= (3.0f*t-2.0f*t*i);
1216                                                 }
1217                                                 visifac*= inpr;
1218                                         }
1219                                 }
1220                         }
1221                 }
1222                 if (visifac <= 0.001f) visifac = 0.0f;
1223                 return visifac;
1224         }
1225 }
1226
1227 /* function returns raw diff, spec and full shadowed diff in the 'shad' pass */
1228 static void shade_one_light(LampRen *lar, ShadeInput *shi, ShadeResult *shr, int passflag)
1229 {
1230         Material *ma= shi->mat;
1231         VlakRen *vlr= shi->vlr;
1232         float lv[3], lampdist, lacol[3], shadfac[4], lashdw[3];
1233         float i, is, i_noshad, inp, *vn, *view, vnor[3], phongcorr=1.0f;
1234         float visifac;
1235         
1236         vn= shi->vn;
1237         view= shi->view;
1238         
1239         
1240         if (lar->energy == 0.0f) return;
1241         /* only shadow lamps shouldn't affect shadow-less materials at all */
1242         if ((lar->mode & LA_ONLYSHADOW) && (!(ma->mode & MA_SHADOW) || !(R.r.mode & R_SHADOW)))
1243                 return;
1244         /* optimisation, don't render fully black lamps */
1245         if (!(lar->mode & LA_TEXTURE) && (lar->r + lar->g + lar->b == 0.0f))
1246                 return;
1247         
1248         /* lampdist, spot angle, area side, ... */
1249         visifac= lamp_get_visibility(lar, shi->co, lv, &lampdist);
1250         if(visifac==0.0f)
1251                 return;
1252         
1253         if(lar->type==LA_SPOT) {
1254                 if(lar->mode & LA_OSATEX) {
1255                         shi->osatex= 1; /* signal for multitex() */
1256                         
1257                         shi->dxlv[0]= lv[0] - (shi->co[0]-lar->co[0]+shi->dxco[0])/lampdist;
1258                         shi->dxlv[1]= lv[1] - (shi->co[1]-lar->co[1]+shi->dxco[1])/lampdist;
1259                         shi->dxlv[2]= lv[2] - (shi->co[2]-lar->co[2]+shi->dxco[2])/lampdist;
1260                         
1261                         shi->dylv[0]= lv[0] - (shi->co[0]-lar->co[0]+shi->dyco[0])/lampdist;
1262                         shi->dylv[1]= lv[1] - (shi->co[1]-lar->co[1]+shi->dyco[1])/lampdist;
1263                         shi->dylv[2]= lv[2] - (shi->co[2]-lar->co[2]+shi->dyco[2])/lampdist;
1264                 }
1265         }
1266         
1267         /* lamp color texture */
1268         lacol[0]= lar->r;
1269         lacol[1]= lar->g;
1270         lacol[2]= lar->b;
1271         
1272         lashdw[0]= lar->shdwr;
1273         lashdw[1]= lar->shdwg;
1274         lashdw[2]= lar->shdwb;
1275         
1276         if(lar->mode & LA_TEXTURE)      do_lamp_tex(lar, lv, shi, lacol, LA_TEXTURE);
1277         if(lar->mode & LA_SHAD_TEX)     do_lamp_tex(lar, lv, shi, lashdw, LA_SHAD_TEX);
1278
1279                 /* tangent case; calculate fake face normal, aligned with lampvector */ 
1280                 /* note, vnor==vn is used as tangent trigger for buffer shadow */
1281         if(vlr->flag & R_TANGENT) {
1282                 float cross[3], nstrand[3], blend;
1283
1284                 if(ma->mode & MA_STR_SURFDIFF) {
1285                         cross_v3_v3v3(cross, shi->surfnor, vn);
1286                         cross_v3_v3v3(nstrand, vn, cross);
1287
1288                         blend= INPR(nstrand, shi->surfnor);
1289                         blend= 1.0f - blend;
1290                         CLAMP(blend, 0.0f, 1.0f);
1291
1292                         interp_v3_v3v3(vnor, nstrand, shi->surfnor, blend);
1293                         normalize_v3(vnor);
1294                 }
1295                 else {
1296                         cross_v3_v3v3(cross, lv, vn);
1297                         cross_v3_v3v3(vnor, cross, vn);
1298                         normalize_v3(vnor);
1299                 }
1300
1301                 if(ma->strand_surfnor > 0.0f) {
1302                         if(ma->strand_surfnor > shi->surfdist) {
1303                                 blend= (ma->strand_surfnor - shi->surfdist)/ma->strand_surfnor;
1304                                 interp_v3_v3v3(vnor, vnor, shi->surfnor, blend);
1305                                 normalize_v3(vnor);
1306                         }
1307                 }
1308
1309                 vnor[0]= -vnor[0];vnor[1]= -vnor[1];vnor[2]= -vnor[2];
1310                 vn= vnor;
1311         }
1312         else if (ma->mode & MA_TANGENT_V) {
1313                 float cross[3];
1314                 cross_v3_v3v3(cross, lv, shi->tang);
1315                 cross_v3_v3v3(vnor, cross, shi->tang);
1316                 normalize_v3(vnor);
1317                 vnor[0]= -vnor[0];vnor[1]= -vnor[1];vnor[2]= -vnor[2];
1318                 vn= vnor;
1319         }
1320         
1321         /* dot product and reflectivity */
1322         /* inp = dotproduct, is = shader result, i = lamp energy (with shadow), i_noshad = i without shadow */
1323         inp= vn[0]*lv[0] + vn[1]*lv[1] + vn[2]*lv[2];
1324         
1325         /* phong threshold to prevent backfacing faces having artefacts on ray shadow (terminator problem) */
1326         /* this complex construction screams for a nicer implementation! (ton) */
1327         if(R.r.mode & R_SHADOW) {
1328                 if(ma->mode & MA_SHADOW) {
1329                         if(lar->type==LA_HEMI || lar->type==LA_AREA);
1330                         else if((ma->mode & MA_RAYBIAS) && (lar->mode & LA_SHAD_RAY) && (vlr->flag & R_SMOOTH)) {
1331                                 float thresh= shi->obr->ob->smoothresh;
1332                                 if(inp>thresh)
1333                                         phongcorr= (inp-thresh)/(inp*(1.0f-thresh));
1334                                 else
1335                                         phongcorr= 0.0f;
1336                         }
1337                         else if(ma->sbias!=0.0f && ((lar->mode & LA_SHAD_RAY) || lar->shb)) {
1338                                 if(inp>ma->sbias)
1339                                         phongcorr= (inp-ma->sbias)/(inp*(1.0f-ma->sbias));
1340                                 else
1341                                         phongcorr= 0.0f;
1342                         }
1343                 }
1344         }
1345         
1346         /* diffuse shaders */
1347         if(lar->mode & LA_NO_DIFF) {
1348                 is= 0.0f;       // skip shaders
1349         }
1350         else if(lar->type==LA_HEMI) {
1351                 is= 0.5f*inp + 0.5f;
1352         }
1353         else {
1354                 
1355                 if(lar->type==LA_AREA)
1356                         inp= area_lamp_energy_multisample(lar, shi->co, vn);
1357                 
1358                 /* diffuse shaders (oren nayer gets inp from area light) */
1359                 if(ma->diff_shader==MA_DIFF_ORENNAYAR) is= OrenNayar_Diff(inp, vn, lv, view, ma->roughness);
1360                 else if(ma->diff_shader==MA_DIFF_TOON) is= Toon_Diff(vn, lv, view, ma->param[0], ma->param[1]);
1361                 else if(ma->diff_shader==MA_DIFF_MINNAERT) is= Minnaert_Diff(inp, vn, view, ma->darkness);
1362                 else if(ma->diff_shader==MA_DIFF_FRESNEL) is= Fresnel_Diff(vn, lv, view, ma->param[0], ma->param[1]);
1363                 else is= inp;   // Lambert
1364         }
1365         
1366         /* 'is' is diffuse */
1367         if((ma->shade_flag & MA_CUBIC) && is>0.0f && is<1.0f)
1368                 is= 3.0f*is*is - 2.0f*is*is*is; // nicer termination of shades
1369
1370         i= is*phongcorr;
1371         
1372         if(i>0.0f) {
1373                 i*= visifac*shi->refl;
1374         }
1375         i_noshad= i;
1376         
1377         vn= shi->vn;    // bring back original vector, we use special specular shaders for tangent
1378         if(ma->mode & MA_TANGENT_V)
1379                 vn= shi->tang;
1380         
1381         /* init transp shadow */
1382         shadfac[0]= shadfac[1]= shadfac[2]= shadfac[3]= 1.0f;
1383         
1384         /* shadow and spec, (visifac==0 outside spot) */
1385         if(visifac> 0.0f) {
1386                 
1387                 if((R.r.mode & R_SHADOW)) {
1388                         if(ma->mode & MA_SHADOW) {
1389                                 if(lar->shb || (lar->mode & LA_SHAD_RAY)) {
1390                                         
1391                                         if(vn==vnor)    /* tangent trigger */
1392                                                 lamp_get_shadow(lar, shi, INPR(shi->vn, lv), shadfac, shi->depth);
1393                                         else
1394                                                 lamp_get_shadow(lar, shi, inp, shadfac, shi->depth);
1395                                                 
1396                                         /* warning, here it skips the loop */
1397                                         if((lar->mode & LA_ONLYSHADOW) && i>0.0f) {
1398                                                 
1399                                                 shadfac[3]= i*lar->energy*(1.0f-shadfac[3]);
1400                                                 shr->shad[0] -= shadfac[3]*shi->r*(1.0f-lashdw[0]);
1401                                                 shr->shad[1] -= shadfac[3]*shi->g*(1.0f-lashdw[1]);
1402                                                 shr->shad[2] -= shadfac[3]*shi->b*(1.0f-lashdw[2]);
1403                                                 
1404                                                 shr->spec[0] -= shadfac[3]*shi->specr*(1.0f-lashdw[0]);
1405                                                 shr->spec[1] -= shadfac[3]*shi->specg*(1.0f-lashdw[1]);
1406                                                 shr->spec[2] -= shadfac[3]*shi->specb*(1.0f-lashdw[2]);
1407                                                 
1408                                                 return;
1409                                         }
1410                                         
1411                                         i*= shadfac[3];
1412                                         shr->shad[3] = shadfac[3]; /* store this for possible check in troublesome cases */
1413                                 }
1414                         }
1415                 }
1416                 
1417                 /* in case 'no diffuse' we still do most calculus, spec can be in shadow.*/
1418                 if(!(lar->mode & LA_NO_DIFF)) {
1419                         if(i>0.0f) {
1420                                 if(ma->mode & MA_SHADOW_TRA)
1421                                         add_to_diffuse(shr->shad, shi, is, i*shadfac[0]*lacol[0], i*shadfac[1]*lacol[1], i*shadfac[2]*lacol[2]);
1422                                 else
1423                                         add_to_diffuse(shr->shad, shi, is, i*lacol[0], i*lacol[1], i*lacol[2]);
1424                         }
1425                         /* add light for colored shadow */
1426                         if (i_noshad>i && !(lashdw[0]==0 && lashdw[1]==0 && lashdw[2]==0)) {
1427                                 add_to_diffuse(shr->shad, shi, is, lashdw[0]*(i_noshad-i)*lacol[0], lashdw[1]*(i_noshad-i)*lacol[1], lashdw[2]*(i_noshad-i)*lacol[2]);
1428                         }
1429                         if(i_noshad>0.0f) {
1430                                 if(passflag & (SCE_PASS_DIFFUSE|SCE_PASS_SHADOW)) {
1431                                         add_to_diffuse(shr->diff, shi, is, i_noshad*lacol[0], i_noshad*lacol[1], i_noshad*lacol[2]);
1432                                 }
1433                                 else
1434                                         VECCOPY(shr->diff, shr->shad);
1435                         }
1436                 }
1437                 
1438                 /* specularity */
1439                 shadfac[3]*= phongcorr; /* note, shadfac not allowed to be stored nonlocal */
1440                 
1441                 if(shadfac[3]>0.0f && shi->spec!=0.0f && !(lar->mode & LA_NO_SPEC) && !(lar->mode & LA_ONLYSHADOW)) {
1442                         
1443                         if(!(passflag & (SCE_PASS_COMBINED|SCE_PASS_SPEC)));
1444                         else if(lar->type==LA_HEMI) {
1445                                 float t;
1446                                 /* hemi uses no spec shaders (yet) */
1447                                 
1448                                 lv[0]+= view[0];
1449                                 lv[1]+= view[1];
1450                                 lv[2]+= view[2];
1451                                 
1452                                 normalize_v3(lv);
1453                                 
1454                                 t= vn[0]*lv[0]+vn[1]*lv[1]+vn[2]*lv[2];
1455                                 
1456                                 if(lar->type==LA_HEMI) {
1457                                         t= 0.5f*t+0.5f;
1458                                 }
1459                                 
1460                                 t= shadfac[3]*shi->spec*spec(t, shi->har);
1461                                 
1462                                 shr->spec[0]+= t*(lacol[0] * shi->specr);
1463                                 shr->spec[1]+= t*(lacol[1] * shi->specg);
1464                                 shr->spec[2]+= t*(lacol[2] * shi->specb);
1465                         }
1466                         else {
1467                                 /* specular shaders */
1468                                 float specfac, t;
1469                                 
1470                                 if(ma->spec_shader==MA_SPEC_PHONG) 
1471                                         specfac= Phong_Spec(vn, lv, view, shi->har, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1472                                 else if(ma->spec_shader==MA_SPEC_COOKTORR) 
1473                                         specfac= CookTorr_Spec(vn, lv, view, shi->har, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1474                                 else if(ma->spec_shader==MA_SPEC_BLINN) 
1475                                         specfac= Blinn_Spec(vn, lv, view, ma->refrac, (float)shi->har, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1476                                 else if(ma->spec_shader==MA_SPEC_WARDISO)
1477                                         specfac= WardIso_Spec( vn, lv, view, ma->rms, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1478                                 else 
1479                                         specfac= Toon_Spec(vn, lv, view, ma->param[2], ma->param[3], (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1480                                 
1481                                 /* area lamp correction */
1482                                 if(lar->type==LA_AREA) specfac*= inp;
1483                                 
1484                                 t= shadfac[3]*shi->spec*visifac*specfac;
1485                                 
1486                                 if(ma->mode & MA_RAMP_SPEC) {
1487                                         float spec[3];
1488                                         do_specular_ramp(shi, specfac, t, spec);
1489                                         shr->spec[0]+= t*(lacol[0] * spec[0]);
1490                                         shr->spec[1]+= t*(lacol[1] * spec[1]);
1491                                         shr->spec[2]+= t*(lacol[2] * spec[2]);
1492                                 }
1493                                 else {
1494                                         shr->spec[0]+= t*(lacol[0] * shi->specr);
1495                                         shr->spec[1]+= t*(lacol[1] * shi->specg);
1496                                         shr->spec[2]+= t*(lacol[2] * shi->specb);
1497                                 }
1498                         }
1499                 }
1500         }
1501 }
1502
1503 static void shade_lamp_loop_only_shadow(ShadeInput *shi, ShadeResult *shr)
1504 {
1505         
1506         if(R.r.mode & R_SHADOW) {
1507                 ListBase *lights;
1508                 LampRen *lar;
1509                 GroupObject *go;
1510                 float inpr, lv[3];
1511                 float *view, shadfac[4];
1512                 float ir, accum, visifac, lampdist;
1513                 float shaded = 0.0f, lightness = 0.0f;
1514                 
1515
1516                 view= shi->view;
1517                 accum= ir= 0.0f;
1518                 
1519                 lights= get_lights(shi);
1520                 for(go=lights->first; go; go= go->next) {
1521                         lar= go->lampren;
1522                         if(lar==NULL) continue;
1523                         
1524                         /* yafray: ignore shading by photonlights, not used in Blender */
1525                         if (lar->type==LA_YF_PHOTON) continue;
1526                         
1527                         if(lar->mode & LA_LAYER) if((lar->lay & shi->obi->lay)==0) continue;
1528                         if((lar->lay & shi->lay)==0) continue;
1529                         
1530                         if(lar->shb || (lar->mode & LA_SHAD_RAY)) {
1531                                 visifac= lamp_get_visibility(lar, shi->co, lv, &lampdist);
1532                                 ir+= 1.0f;
1533
1534                                 if(visifac <= 0.0f) {
1535                                         if (shi->mat->shadowonly_flag == MA_SO_OLD)
1536                                                 accum+= 1.0f;
1537
1538                                         continue;
1539                                 }
1540                                 inpr= INPR(shi->vn, lv);
1541                                 if(inpr <= 0.0f) {
1542                                         if (shi->mat->shadowonly_flag == MA_SO_OLD)
1543                                                 accum+= 1.0f;
1544
1545                                         continue;
1546                                 }
1547
1548                                 lamp_get_shadow(lar, shi, inpr, shadfac, shi->depth);
1549
1550                                 if (shi->mat->shadowonly_flag == MA_SO_OLD) {
1551                                         /* Old "Shadows Only" */
1552                                         accum+= (1.0f-visifac) + (visifac)*rgb_to_grayscale(shadfac)*shadfac[3];
1553                                 }
1554                                 else {
1555                                         shaded += rgb_to_grayscale(shadfac)*shadfac[3] * visifac * lar->energy;
1556
1557                                         if (shi->mat->shadowonly_flag == MA_SO_SHADOW) {
1558                                                 lightness += visifac * lar->energy;
1559                                         }
1560                                 }
1561                         }
1562                 }
1563
1564                 /* Apply shadows as alpha */
1565                 if(ir>0.0f) {
1566                         if (shi->mat->shadowonly_flag == MA_SO_OLD) {
1567                                 accum = 1.0f - accum/ir;
1568                         }
1569                         else {
1570                                 if (shi->mat->shadowonly_flag == MA_SO_SHADOW) {
1571                                         if (lightness > 0.0f) {
1572                                                 /* Get shadow value from between 0.0f and non-shadowed lightness */
1573                                                 accum = (lightness - shaded) / (lightness);
1574                                         }
1575                                         else {
1576                                                 accum = 0.0f;
1577                                         }
1578                                 }
1579                                 else { /* shadowonly_flag == MA_SO_SHADED */
1580                                         /* Use shaded value */
1581                                         accum = 1.0f - shaded;
1582                         }}
1583
1584                         shr->alpha= (shi->alpha)*(accum);
1585                         if (shr->alpha<0.0f) shr->alpha=0.0f;
1586                 }
1587                 else {
1588                         /* If "fully shaded", use full alpha even on areas that have no lights */
1589                         if (shi->mat->shadowonly_flag == MA_SO_SHADED) shr->alpha=shi->alpha;
1590                         else shr->alpha= 0.f;
1591                 }
1592         }
1593         
1594         /* quite disputable this...  also note it doesn't mirror-raytrace */    
1595         if((R.wrld.mode & (WO_AMB_OCC|WO_ENV_LIGHT)) && shi->amb!=0.0f) {
1596                 float f;
1597                 
1598                 if(R.wrld.mode & WO_AMB_OCC) {
1599                         f= R.wrld.aoenergy*shi->amb;
1600                         
1601                         if(R.wrld.aomix==WO_AOADD) {
1602                                 if (shi->mat->shadowonly_flag == MA_SO_OLD) {
1603                                         f= f*(1.0f - rgb_to_grayscale(shi->ao));
1604                                         shr->alpha= (shr->alpha + f)*f;
1605                                 }
1606                                 else {
1607                                         shr->alpha -= f*rgb_to_grayscale(shi->ao);
1608                                         if (shr->alpha<0.0f) shr->alpha=0.0f;
1609                                 }
1610                         }
1611                         else /* AO Multiply */
1612                                 shr->alpha= (1.0f - f)*shr->alpha + f*(1.0f - (1.0f - shr->alpha)*rgb_to_grayscale(shi->ao));
1613                 }
1614
1615                 if(R.wrld.mode & WO_ENV_LIGHT) {
1616                         if (shi->mat->shadowonly_flag == MA_SO_OLD) {
1617                                 f= R.wrld.ao_env_energy*shi->amb*(1.0f - rgb_to_grayscale(shi->env));
1618                                 shr->alpha= (shr->alpha + f)*f;
1619                         }
1620                         else {
1621                                 f= R.wrld.ao_env_energy*shi->amb;
1622                                 shr->alpha -= f*rgb_to_grayscale(shi->env);
1623                                 if (shr->alpha<0.0f) shr->alpha=0.0f;
1624                         }
1625                 }
1626         }
1627 }
1628
1629 /* let's map negative light as if it mirrors positive light, otherwise negative values disappear */
1630 static void wrld_exposure_correct(float *diff)
1631 {
1632         
1633         diff[0]= R.wrld.linfac*(1.0f-exp( diff[0]*R.wrld.logfac) );
1634         diff[1]= R.wrld.linfac*(1.0f-exp( diff[1]*R.wrld.logfac) );
1635         diff[2]= R.wrld.linfac*(1.0f-exp( diff[2]*R.wrld.logfac) );
1636 }
1637
1638 void shade_lamp_loop(ShadeInput *shi, ShadeResult *shr)
1639 {
1640         Material *ma= shi->mat;
1641         int passflag= shi->passflag;
1642         
1643         memset(shr, 0, sizeof(ShadeResult));
1644         
1645         if(!(shi->mode & MA_TRANSP)) shi->alpha = 1.0f;
1646         
1647         /* separate loop */
1648         if(ma->mode & MA_ONLYSHADOW) {
1649                 shade_lamp_loop_only_shadow(shi, shr);
1650                 return;
1651         }
1652         
1653         /* envmap hack, always reset */
1654         shi->refcol[0]= shi->refcol[1]= shi->refcol[2]= shi->refcol[3]= 0.0f;
1655         
1656         /* material color itself */
1657         if(passflag & (SCE_PASS_COMBINED|SCE_PASS_RGBA)) {
1658                 if(ma->mode & (MA_FACETEXTURE)) {
1659                         shi->r= shi->vcol[0];
1660                         shi->g= shi->vcol[1];
1661                         shi->b= shi->vcol[2];
1662                         if(ma->mode & (MA_FACETEXTURE_ALPHA))
1663                                 shi->alpha= shi->vcol[3];
1664                 }
1665                 else if(ma->mode & (MA_VERTEXCOLP)) {
1666                         float inv_alpha = 1.0f - shi->vcol[3];
1667                         shi->r= shi->r*inv_alpha + shi->vcol[0]*shi->vcol[3];
1668                         shi->g= shi->g*inv_alpha + shi->vcol[1]*shi->vcol[3];
1669                         shi->b= shi->b*inv_alpha + shi->vcol[2]*shi->vcol[3];
1670                 }
1671                 if(ma->texco){
1672                         do_material_tex(shi);
1673                         if (!(shi->mode & MA_TRANSP)) shi->alpha = 1.0f;
1674                 }
1675                 
1676                 shr->col[0]= shi->r*shi->alpha;
1677                 shr->col[1]= shi->g*shi->alpha;
1678                 shr->col[2]= shi->b*shi->alpha;
1679                 shr->col[3]= shi->alpha;
1680
1681                 if((ma->sss_flag & MA_DIFF_SSS) && !sss_pass_done(&R, ma)) {
1682                         if(ma->sss_texfac == 0.0f) {
1683                                 shi->r= shi->g= shi->b= shi->alpha= 1.0f;
1684                                 shr->col[0]= shr->col[1]= shr->col[2]= shr->col[3]= 1.0f;
1685                         }
1686                         else {
1687                                 shi->r= pow(shi->r, ma->sss_texfac);
1688                                 shi->g= pow(shi->g, ma->sss_texfac);
1689                                 shi->b= pow(shi->b, ma->sss_texfac);
1690                                 shi->alpha= pow(shi->alpha, ma->sss_texfac);
1691                                 
1692                                 shr->col[0]= pow(shr->col[0], ma->sss_texfac);
1693                                 shr->col[1]= pow(shr->col[1], ma->sss_texfac);
1694                                 shr->col[2]= pow(shr->col[2], ma->sss_texfac);
1695                                 shr->col[3]= pow(shr->col[3], ma->sss_texfac);
1696                         }
1697                 }
1698         }
1699         
1700         if(ma->mode & MA_SHLESS) {
1701                 shr->combined[0]= shi->r;
1702                 shr->combined[1]= shi->g;
1703                 shr->combined[2]= shi->b;
1704                 shr->alpha= shi->alpha;
1705                 return;
1706         }
1707
1708         if( (ma->mode & (MA_VERTEXCOL|MA_VERTEXCOLP))== MA_VERTEXCOL ) {        // vertexcolor light
1709                 shr->emit[0]= shi->r*(shi->emit+shi->vcol[0]);
1710                 shr->emit[1]= shi->g*(shi->emit+shi->vcol[1]);
1711                 shr->emit[2]= shi->b*(shi->emit+shi->vcol[2]);
1712         }
1713         else {
1714                 shr->emit[0]= shi->r*shi->emit;
1715                 shr->emit[1]= shi->g*shi->emit;
1716                 shr->emit[2]= shi->b*shi->emit;
1717         }
1718         
1719         /* AO pass */
1720         if(R.wrld.mode & (WO_AMB_OCC|WO_ENV_LIGHT|WO_INDIRECT_LIGHT)) {
1721                 if(((passflag & SCE_PASS_COMBINED) && (shi->combinedflag & (SCE_PASS_AO|SCE_PASS_ENVIRONMENT|SCE_PASS_INDIRECT)))
1722                         || (passflag & (SCE_PASS_AO|SCE_PASS_ENVIRONMENT|SCE_PASS_INDIRECT))) {
1723                         if(R.r.mode & R_SHADOW) {
1724                                 /* AO was calculated for scanline already */
1725                                 if(shi->depth || shi->volume_depth)
1726                                         ambient_occlusion(shi);
1727                                 VECCOPY(shr->ao, shi->ao);
1728                                 VECCOPY(shr->env, shi->env); // XXX multiply
1729                                 VECCOPY(shr->indirect, shi->indirect); // XXX multiply
1730                         }
1731                 }
1732         }
1733         
1734         /* lighting pass */
1735         if(passflag & (SCE_PASS_COMBINED|SCE_PASS_DIFFUSE|SCE_PASS_SPEC|SCE_PASS_SHADOW)) {
1736                 GroupObject *go;
1737                 ListBase *lights;
1738                 LampRen *lar;
1739                 
1740                 lights= get_lights(shi);
1741                 for(go=lights->first; go; go= go->next) {
1742                         lar= go->lampren;
1743                         if(lar==NULL) continue;
1744                         
1745                         /* yafray: ignore shading by photonlights, not used in Blender */
1746                         if (lar->type==LA_YF_PHOTON) continue;
1747                         
1748                         /* test for lamp layer */
1749                         if(lar->mode & LA_LAYER) if((lar->lay & shi->obi->lay)==0) continue;
1750                         if((lar->lay & shi->lay)==0) continue;
1751                         
1752                         /* accumulates in shr->diff and shr->spec and shr->shad (diffuse with shadow!) */
1753                         shade_one_light(lar, shi, shr, passflag);
1754                 }
1755
1756                 /*this check is to prevent only shadow lamps from producing negative
1757                   colors.*/
1758                 if (shr->spec[0] < 0) shr->spec[0] = 0;
1759                 if (shr->spec[1] < 0) shr->spec[1] = 0;
1760                 if (shr->spec[2] < 0) shr->spec[2] = 0;
1761
1762                 if (shr->shad[0] < 0) shr->shad[0] = 0;
1763                 if (shr->shad[1] < 0) shr->shad[1] = 0;
1764                 if (shr->shad[2] < 0) shr->shad[2] = 0;
1765                                                 
1766                 if(ma->sss_flag & MA_DIFF_SSS) {
1767                         float sss[3], col[3], invalpha, texfac= ma->sss_texfac;
1768
1769                         /* this will return false in the preprocess stage */
1770                         if(sample_sss(&R, ma, shi->co, sss)) {
1771                                 invalpha= (shr->col[3] > FLT_EPSILON)? 1.0f/shr->col[3]: 1.0f;
1772
1773                                 if(texfac==0.0f) {
1774                                         VECCOPY(col, shr->col);
1775                                         mul_v3_fl(col, invalpha);
1776                                 }
1777                                 else if(texfac==1.0f) {
1778                                         col[0]= col[1]= col[2]= 1.0f;
1779                                         mul_v3_fl(col, invalpha);
1780                                 }
1781                                 else {
1782                                         VECCOPY(col, shr->col);
1783                                         mul_v3_fl(col, invalpha);
1784                                         col[0]= pow(col[0], 1.0f-texfac);
1785                                         col[1]= pow(col[1], 1.0f-texfac);
1786                                         col[2]= pow(col[2], 1.0f-texfac);
1787                                 }
1788
1789                                 shr->diff[0]= sss[0]*col[0];
1790                                 shr->diff[1]= sss[1]*col[1];
1791                                 shr->diff[2]= sss[2]*col[2];
1792
1793                                 if(shi->combinedflag & SCE_PASS_SHADOW) {
1794                                         shr->shad[0]= shr->diff[0];
1795                                         shr->shad[1]= shr->diff[1];
1796                                         shr->shad[2]= shr->diff[2];
1797                                 }
1798                         }
1799                 }
1800                 
1801                 if(shi->combinedflag & SCE_PASS_SHADOW) 
1802                         VECCOPY(shr->combined, shr->shad)       /* note, no ';' ! */
1803                 else
1804                         VECCOPY(shr->combined, shr->diff);
1805                         
1806                 /* calculate shadow pass, we use a multiplication mask */
1807                 /* if diff = 0,0,0 it doesn't matter what the shadow pass is, so leave it as is */
1808                 if(passflag & SCE_PASS_SHADOW && !(shr->diff[0]==0.0f && shr->diff[1]==0.0f && shr->diff[2]==0.0f)) {
1809                         if(shr->diff[0]!=0.0f) shr->shad[0]= shr->shad[0]/shr->diff[0];
1810                         /* can't determine proper shadow from shad/diff (0/0), so use shadow intensity */
1811                         else if(shr->shad[0]==0.0f) shr->shad[0]= shr->shad[3];
1812
1813                         if(shr->diff[1]!=0.0f) shr->shad[1]= shr->shad[1]/shr->diff[1];
1814                         else if(shr->shad[1]==0.0f) shr->shad[1]= shr->shad[3];
1815
1816                         if(shr->diff[2]!=0.0f) shr->shad[2]= shr->shad[2]/shr->diff[2];
1817                         else if(shr->shad[2]==0.0f) shr->shad[2]= shr->shad[3];
1818                 }
1819                 
1820                 /* exposure correction */
1821                 if((R.wrld.exp!=0.0f || R.wrld.range!=1.0f) && !R.sss_points) {
1822                         wrld_exposure_correct(shr->combined);   /* has no spec! */
1823                         wrld_exposure_correct(shr->spec);
1824                 }
1825         }
1826         
1827         /* alpha in end, spec can influence it */
1828         if(passflag & (SCE_PASS_COMBINED)) {
1829                 if((ma->fresnel_tra!=0.0f) && (shi->mode & MA_TRANSP))
1830                         shi->alpha*= fresnel_fac(shi->view, shi->vn, ma->fresnel_tra_i, ma->fresnel_tra);
1831                         
1832                 /* note: shi->mode! */
1833                 if(shi->mode & MA_TRANSP && (shi->mode & (MA_ZTRANSP|MA_RAYTRANSP))) {
1834                         if(shi->spectra!=0.0f) {
1835                                 float t = MAX3(shr->spec[0], shr->spec[1], shr->spec[2]);
1836                                 t *= shi->spectra;
1837                                 if(t>1.0f) t= 1.0f;
1838                                 shi->alpha= (1.0f-t)*shi->alpha+t;
1839                         }
1840                 }
1841         }
1842         shr->alpha= shi->alpha;
1843         
1844         /* from now stuff everything in shr->combined: ambient, AO, radio, ramps, exposure */
1845         if(!(ma->sss_flag & MA_DIFF_SSS) || !sss_pass_done(&R, ma)) {
1846                 if(R.r.mode & R_SHADOW) {
1847                         /* add AO in combined? */
1848                         if(R.wrld.mode & WO_AMB_OCC)
1849                                 if(shi->combinedflag & SCE_PASS_AO)
1850                                         ambient_occlusion_apply(shi, shr);
1851
1852                         if(R.wrld.mode & WO_ENV_LIGHT)
1853                                 if(shi->combinedflag & SCE_PASS_ENVIRONMENT)
1854                                         environment_lighting_apply(shi, shr);
1855
1856                         if(R.wrld.mode & WO_INDIRECT_LIGHT)
1857                                 if(shi->combinedflag & SCE_PASS_INDIRECT)
1858                                         indirect_lighting_apply(shi, shr);
1859                 }
1860                 
1861                 shr->combined[0]+= shi->ambr;
1862                 shr->combined[1]+= shi->ambg;
1863                 shr->combined[2]+= shi->ambb;
1864                 
1865                 if(ma->mode & MA_RAMP_COL) ramp_diffuse_result(shr->combined, shi);
1866         }
1867
1868         if(ma->mode & MA_RAMP_SPEC) ramp_spec_result(shr->spec, shr->spec+1, shr->spec+2, shi);
1869         
1870         /* refcol is for envmap only */
1871         if(shi->refcol[0]!=0.0f) {
1872                 float result[3];
1873                 
1874                 result[0]= shi->mirr*shi->refcol[1] + (1.0f - shi->mirr*shi->refcol[0])*shr->combined[0];
1875                 result[1]= shi->mirg*shi->refcol[2] + (1.0f - shi->mirg*shi->refcol[0])*shr->combined[1];
1876                 result[2]= shi->mirb*shi->refcol[3] + (1.0f - shi->mirb*shi->refcol[0])*shr->combined[2];
1877                 
1878                 if(passflag & SCE_PASS_REFLECT)
1879                         VECSUB(shr->refl, result, shr->combined);
1880                 
1881                 if(shi->combinedflag & SCE_PASS_REFLECT)
1882                         VECCOPY(shr->combined, result);
1883                         
1884         }
1885         
1886         /* and add emit and spec */
1887         if(shi->combinedflag & SCE_PASS_EMIT)
1888                 VECADD(shr->combined, shr->combined, shr->emit);
1889         if(shi->combinedflag & SCE_PASS_SPEC)
1890                 VECADD(shr->combined, shr->combined, shr->spec);
1891         
1892         /* modulate by the object color */
1893         if((ma->shade_flag & MA_OBCOLOR) && shi->obr->ob) {
1894                 if(!(ma->sss_flag & MA_DIFF_SSS) || !sss_pass_done(&R, ma)) {
1895                         float obcol[4];
1896
1897                         QUATCOPY(obcol, shi->obr->ob->col);
1898                         CLAMP(obcol[3], 0.0f, 1.0f);
1899
1900                         shr->combined[0] *= obcol[0];
1901                         shr->combined[1] *= obcol[1];
1902                         shr->combined[2] *= obcol[2];
1903                         if (shi->mode & MA_TRANSP) shr->alpha *= obcol[3];
1904                 }
1905         }
1906
1907         shr->combined[3]= shr->alpha;
1908 }
1909