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Fix for bug #8963: area light + cubic shading became darker
[plumiferos.git] / source / blender / render / intern / source / shadeoutput.c
blob4d8b5a3b3aee1089ef1b6e149063ebdcd7426daa
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 #include <stdio.h>
29 #include <float.h>
30 #include <math.h>
31 #include <string.h>
32
33 #include "MTC_matrixops.h"
34 #include "BLI_arithb.h"
35
36 #include "BKE_colortools.h"
37 #include "BKE_material.h"
38 #include "BKE_texture.h"
39 #include "BKE_utildefines.h"
40
41 #include "DNA_group_types.h"
42 #include "DNA_lamp_types.h"
43 #include "DNA_material_types.h"
44
45 /* local include */
46 #include "renderpipeline.h"
47 #include "render_types.h"
48 #include "pixelblending.h"
49 #include "rendercore.h"
50 #include "shadbuf.h"
51 #include "sss.h"
52 #include "texture.h"
53
54 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
55 /* defined in pipeline.c, is hardcopy of active dynamic allocated Render */
56 /* only to be used here in this file, it's for speed */
57 extern struct Render R;
58 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
59
60 static ListBase *get_lights(ShadeInput *shi)
61 {
62
63 if(shi->light_override)
64 return &shi->light_override->gobject;
65 else if(shi->mat && shi->mat->group)
66 return &shi->mat->group->gobject;
67 else
68 return &R.lights;
69 }
70
71 #if 0
72 static void fogcolor(float *colf, float *rco, float *view)
73 {
74 float alpha, stepsize, startdist, dist, hor[4], zen[3], vec[3], dview[3];
75 float div=0.0f, distfac;
76
77 hor[0]= R.wrld.horr; hor[1]= R.wrld.horg; hor[2]= R.wrld.horb;
78 zen[0]= R.wrld.zenr; zen[1]= R.wrld.zeng; zen[2]= R.wrld.zenb;
79
80 VECCOPY(vec, rco);
81
82 /* we loop from cur coord to mist start in steps */
83 stepsize= 1.0f;
84
85 div= ABS(view[2]);
86 dview[0]= view[0]/(stepsize*div);
87 dview[1]= view[1]/(stepsize*div);
88 dview[2]= -stepsize;
89
90 startdist= -rco[2] + BLI_frand();
91 for(dist= startdist; dist>R.wrld.miststa; dist-= stepsize) {
92
93 hor[0]= R.wrld.horr; hor[1]= R.wrld.horg; hor[2]= R.wrld.horb;
94 alpha= 1.0f;
95 do_sky_tex(vec, vec, NULL, hor, zen, &alpha);
96
97 distfac= (dist-R.wrld.miststa)/R.wrld.mistdist;
98
99 hor[3]= hor[0]*distfac*distfac;
100
101 /* premul! */
102 alpha= hor[3];
103 hor[0]= hor[0]*alpha;
104 hor[1]= hor[1]*alpha;
105 hor[2]= hor[2]*alpha;
106 addAlphaOverFloat(colf, hor);
107
108 VECSUB(vec, vec, dview);
109 }
110 }
111 #endif
112
113 /* zcor is distance, co the 3d coordinate in eye space, return alpha */
114 float mistfactor(float zcor, float *co)
115 {
116 float fac, hi;
117
118 fac= zcor - R.wrld.miststa; /* zcor is calculated per pixel */
119
120 /* fac= -co[2]-R.wrld.miststa; */
121
122 if(fac>0.0f) {
123 if(fac< R.wrld.mistdist) {
124
125 fac= (fac/(R.wrld.mistdist));
126
127 if(R.wrld.mistype==0) fac*= fac;
128 else if(R.wrld.mistype==1);
129 else fac= sqrt(fac);
130 }
131 else fac= 1.0f;
132 }
133 else fac= 0.0f;
134
135 /* height switched off mist */
136 if(R.wrld.misthi!=0.0f && fac!=0.0f) {
137 /* at height misthi the mist is completely gone */
138
139 hi= R.viewinv[0][2]*co[0]+R.viewinv[1][2]*co[1]+R.viewinv[2][2]*co[2]+R.viewinv[3][2];
140
141 if(hi>R.wrld.misthi) fac= 0.0f;
142 else if(hi>0.0f) {
143 hi= (R.wrld.misthi-hi)/R.wrld.misthi;
144 fac*= hi*hi;
145 }
146 }
147
148 return (1.0f-fac)* (1.0f-R.wrld.misi);
149 }
150
151 static void spothalo(struct LampRen *lar, ShadeInput *shi, float *intens)
152 {
153 double a, b, c, disc, nray[3], npos[3];
154 float t0, t1 = 0.0f, t2= 0.0f, t3, haint;
155 float p1[3], p2[3], ladist, maxz = 0.0f, maxy = 0.0f;
156 int snijp, doclip=1, use_yco=0;
157 int ok1=0, ok2=0;
158
159 *intens= 0.0f;
160 haint= lar->haint;
161
162 if(R.r.mode & R_ORTHO) {
163 /* camera pos (view vector) cannot be used... */
164 /* camera position (cox,coy,0) rotate around lamp */
165 p1[0]= shi->co[0]-lar->co[0];
166 p1[1]= shi->co[1]-lar->co[1];
167 p1[2]= -lar->co[2];
168 MTC_Mat3MulVecfl(lar->imat, p1);
169 VECCOPY(npos, p1); // npos is double!
170
171 /* pre-scale */
172 npos[2]*= lar->sh_zfac;
173 }
174 else {
175 VECCOPY(npos, lar->sh_invcampos); /* in initlamp calculated */
176 }
177
178 /* rotate view */
179 VECCOPY(nray, shi->view);
180 MTC_Mat3MulVecd(lar->imat, nray);
181
182 if(R.wrld.mode & WO_MIST) {
183 /* patchy... */
184 haint *= mistfactor(-lar->co[2], lar->co);
185 if(haint==0.0f) {
186 return;
187 }
188 }
189
190
191 /* rotate maxz */
192 if(shi->co[2]==0.0f) doclip= 0; /* for when halo at sky */
193 else {
194 p1[0]= shi->co[0]-lar->co[0];
195 p1[1]= shi->co[1]-lar->co[1];
196 p1[2]= shi->co[2]-lar->co[2];
197
198 maxz= lar->imat[0][2]*p1[0]+lar->imat[1][2]*p1[1]+lar->imat[2][2]*p1[2];
199 maxz*= lar->sh_zfac;
200 maxy= lar->imat[0][1]*p1[0]+lar->imat[1][1]*p1[1]+lar->imat[2][1]*p1[2];
201
202 if( fabs(nray[2]) < DBL_EPSILON ) use_yco= 1;
203 }
204
205 /* scale z to make sure volume is normalized */
206 nray[2]*= lar->sh_zfac;
207 /* nray does not need normalization */
208
209 ladist= lar->sh_zfac*lar->dist;
210
211 /* solve */
212 a = nray[0] * nray[0] + nray[1] * nray[1] - nray[2]*nray[2];
213 b = nray[0] * npos[0] + nray[1] * npos[1] - nray[2]*npos[2];
214 c = npos[0] * npos[0] + npos[1] * npos[1] - npos[2]*npos[2];
215
216 snijp= 0;
217 if (fabs(a) < DBL_EPSILON) {
218 /*
219 * Only one intersection point...
220 */
221 return;
222 }
223 else {
224 disc = b*b - a*c;
225
226 if(disc==0.0) {
227 t1=t2= (-b)/ a;
228 snijp= 2;
229 }
230 else if (disc > 0.0) {
231 disc = sqrt(disc);
232 t1 = (-b + disc) / a;
233 t2 = (-b - disc) / a;
234 snijp= 2;
235 }
236 }
237 if(snijp==2) {
238 /* sort */
239 if(t1>t2) {
240 a= t1; t1= t2; t2= a;
241 }
242
243 /* z of intersection points with diabolo */
244 p1[2]= npos[2] + t1*nray[2];
245 p2[2]= npos[2] + t2*nray[2];
246
247 /* evaluate both points */
248 if(p1[2]<=0.0f) ok1= 1;
249 if(p2[2]<=0.0f && t1!=t2) ok2= 1;
250
251 /* at least 1 point with negative z */
252 if(ok1==0 && ok2==0) return;
253
254 /* intersction point with -ladist, the bottom of the cone */
255 if(use_yco==0) {
256 t3= (-ladist-npos[2])/nray[2];
257
258 /* de we have to replace one of the intersection points? */
259 if(ok1) {
260 if(p1[2]<-ladist) t1= t3;
261 }
262 else {
263 ok1= 1;
264 t1= t3;
265 }
266 if(ok2) {
267 if(p2[2]<-ladist) t2= t3;
268 }
269 else {
270 ok2= 1;
271 t2= t3;
272 }
273 }
274 else if(ok1==0 || ok2==0) return;
275
276 /* at least 1 visible interesction point */
277 if(t1<0.0f && t2<0.0f) return;
278
279 if(t1<0.0f) t1= 0.0f;
280 if(t2<0.0f) t2= 0.0f;
281
282 if(t1==t2) return;
283
284 /* sort again to be sure */
285 if(t1>t2) {
286 a= t1; t1= t2; t2= a;
287 }
288
289 /* calculate t0: is the maximum visible z (when halo is intersected by face) */
290 if(doclip) {
291 if(use_yco==0) t0= (maxz-npos[2])/nray[2];
292 else t0= (maxy-npos[1])/nray[1];
293
294 if(t0<t1) return;
295 if(t0<t2) t2= t0;
296 }
297
298 /* calc points */
299 p1[0]= npos[0] + t1*nray[0];
300 p1[1]= npos[1] + t1*nray[1];
301 p1[2]= npos[2] + t1*nray[2];
302 p2[0]= npos[0] + t2*nray[0];
303 p2[1]= npos[1] + t2*nray[1];
304 p2[2]= npos[2] + t2*nray[2];
305
306
307 /* now we have 2 points, make three lengths with it */
308
309 a= sqrt(p1[0]*p1[0]+p1[1]*p1[1]+p1[2]*p1[2]);
310 b= sqrt(p2[0]*p2[0]+p2[1]*p2[1]+p2[2]*p2[2]);
311 c= VecLenf(p1, p2);
312
313 a/= ladist;
314 a= sqrt(a);
315 b/= ladist;
316 b= sqrt(b);
317 c/= ladist;
318
319 *intens= c*( (1.0-a)+(1.0-b) );
320
321 /* WATCH IT: do not clip a,b en c at 1.0, this gives nasty little overflows
322 at the edges (especially with narrow halos) */
323 if(*intens<=0.0f) return;
324
325 /* soft area */
326 /* not needed because t0 has been used for p1/p2 as well */
327 /* if(doclip && t0<t2) { */
328 /* *intens *= (t0-t1)/(t2-t1); */
329 /* } */
330
331 *intens *= haint;
332
333 if(lar->shb && lar->shb->shadhalostep) {
334 *intens *= shadow_halo(lar, p1, p2);
335 }
336
337 }
338 }
339
340 void renderspothalo(ShadeInput *shi, float *col, float alpha)
341 {
342 ListBase *lights;
343 GroupObject *go;
344 LampRen *lar;
345 float i;
346
347 if(alpha==0.0f) return;
348
349 lights= get_lights(shi);
350 for(go=lights->first; go; go= go->next) {
351 lar= go->lampren;
352 if(lar==NULL) continue;
353
354 if(lar->type==LA_SPOT && (lar->mode & LA_HALO) && lar->haint>0) {
355
356 if(lar->mode & LA_LAYER)
357 if(shi->vlr && (lar->lay & shi->vlr->lay)==0)
358 continue;
359 if((lar->lay & shi->lay)==0)
360 continue;
361
362 spothalo(lar, shi, &i);
363 if(i>0.0f) {
364 col[3]+= i*alpha; // all premul
365 col[0]+= i*lar->r*alpha;
366 col[1]+= i*lar->g*alpha;
367 col[2]+= i*lar->b*alpha;
368 }
369 }
370 }
371 /* clip alpha, is needed for unified 'alpha threshold' (vanillaRenderPipe.c) */
372 if(col[3]>1.0f) col[3]= 1.0f;
373 }
374
375
376
377 /* ---------------- shaders ----------------------- */
378
379 static double Normalize_d(double *n)
380 {
381 double d;
382
383 d= n[0]*n[0]+n[1]*n[1]+n[2]*n[2];
384
385 if(d>0.00000000000000001) {
386 d= sqrt(d);
387
388 n[0]/=d;
389 n[1]/=d;
390 n[2]/=d;
391 } else {
392 n[0]=n[1]=n[2]= 0.0;
393 d= 0.0;
394 }
395 return d;
396 }
397
398 /* mix of 'real' fresnel and allowing control. grad defines blending gradient */
399 float fresnel_fac(float *view, float *vn, float grad, float fac)
400 {
401 float t1, t2;
402
403 if(fac==0.0f) return 1.0f;
404
405 t1= (view[0]*vn[0] + view[1]*vn[1] + view[2]*vn[2]);
406 if(t1>0.0f) t2= 1.0f+t1;
407 else t2= 1.0f-t1;
408
409 t2= grad + (1.0f-grad)*pow(t2, fac);
410
411 if(t2<0.0f) return 0.0f;
412 else if(t2>1.0f) return 1.0f;
413 return t2;
414 }
415
416 static double saacos_d(double fac)
417 {
418 if(fac<= -1.0f) return M_PI;
419 else if(fac>=1.0f) return 0.0;
420 else return acos(fac);
421 }
422
423 /* Stoke's form factor. Need doubles here for extreme small area sizes */
424 static float area_lamp_energy(float *co, float *vn, LampRen *lar)
425 {
426 double fac;
427 double vec[4][3]; /* vectors of rendered co to vertices lamp */
428 double cross[4][3]; /* cross products of this */
429 double rad[4]; /* angles between vecs */
430
431 VECSUB(vec[0], co, lar->area[0]);
432 VECSUB(vec[1], co, lar->area[1]);
433 VECSUB(vec[2], co, lar->area[2]);
434 VECSUB(vec[3], co, lar->area[3]);
435
436 Normalize_d(vec[0]);
437 Normalize_d(vec[1]);
438 Normalize_d(vec[2]);
439 Normalize_d(vec[3]);
440
441 /* cross product */
442 CROSS(cross[0], vec[0], vec[1]);
443 CROSS(cross[1], vec[1], vec[2]);
444 CROSS(cross[2], vec[2], vec[3]);
445 CROSS(cross[3], vec[3], vec[0]);
446
447 Normalize_d(cross[0]);
448 Normalize_d(cross[1]);
449 Normalize_d(cross[2]);
450 Normalize_d(cross[3]);
451
452 /* angles */
453 rad[0]= vec[0][0]*vec[1][0]+ vec[0][1]*vec[1][1]+ vec[0][2]*vec[1][2];
454 rad[1]= vec[1][0]*vec[2][0]+ vec[1][1]*vec[2][1]+ vec[1][2]*vec[2][2];
455 rad[2]= vec[2][0]*vec[3][0]+ vec[2][1]*vec[3][1]+ vec[2][2]*vec[3][2];
456 rad[3]= vec[3][0]*vec[0][0]+ vec[3][1]*vec[0][1]+ vec[3][2]*vec[0][2];
457
458 rad[0]= saacos_d(rad[0]);
459 rad[1]= saacos_d(rad[1]);
460 rad[2]= saacos_d(rad[2]);
461 rad[3]= saacos_d(rad[3]);
462
463 /* Stoke formula */
464 fac= rad[0]*(vn[0]*cross[0][0]+ vn[1]*cross[0][1]+ vn[2]*cross[0][2]);
465 fac+= rad[1]*(vn[0]*cross[1][0]+ vn[1]*cross[1][1]+ vn[2]*cross[1][2]);
466 fac+= rad[2]*(vn[0]*cross[2][0]+ vn[1]*cross[2][1]+ vn[2]*cross[2][2]);
467 fac+= rad[3]*(vn[0]*cross[3][0]+ vn[1]*cross[3][1]+ vn[2]*cross[3][2]);
468
469 if(fac<=0.0) return 0.0;
470 return pow(fac*lar->areasize, lar->k); // corrected for buttons size and lar->dist^2
471 }
472
473 static float spec(float inp, int hard)
474 {
475 float b1;
476
477 if(inp>=1.0f) return 1.0f;
478 else if (inp<=0.0f) return 0.0f;
479
480 b1= inp*inp;
481 /* avoid FPE */
482 if(b1<0.01f) b1= 0.01f;
483
484 if((hard & 1)==0) inp= 1.0f;
485 if(hard & 2) inp*= b1;
486 b1*= b1;
487 if(hard & 4) inp*= b1;
488 b1*= b1;
489 if(hard & 8) inp*= b1;
490 b1*= b1;
491 if(hard & 16) inp*= b1;
492 b1*= b1;
493
494 /* avoid FPE */
495 if(b1<0.001f) b1= 0.0f;
496
497 if(hard & 32) inp*= b1;
498 b1*= b1;
499 if(hard & 64) inp*=b1;
500 b1*= b1;
501 if(hard & 128) inp*=b1;
502
503 if(b1<0.001f) b1= 0.0f;
504
505 if(hard & 256) {
506 b1*= b1;
507 inp*=b1;
508 }
509
510 return inp;
511 }
512
513 static float Phong_Spec( float *n, float *l, float *v, int hard, int tangent )
514 {
515 float h[3];
516 float rslt;
517
518 h[0] = l[0] + v[0];
519 h[1] = l[1] + v[1];
520 h[2] = l[2] + v[2];
521 Normalize(h);
522
523 rslt = h[0]*n[0] + h[1]*n[1] + h[2]*n[2];
524 if(tangent) rslt= sasqrt(1.0f - rslt*rslt);
525
526 if( rslt > 0.0f ) rslt= spec(rslt, hard);
527 else rslt = 0.0f;
528
529 return rslt;
530 }
531
532
533 /* reduced cook torrance spec (for off-specular peak) */
534 static float CookTorr_Spec(float *n, float *l, float *v, int hard, int tangent)
535 {
536 float i, nh, nv, h[3];
537
538 h[0]= v[0]+l[0];
539 h[1]= v[1]+l[1];
540 h[2]= v[2]+l[2];
541 Normalize(h);
542
543 nh= n[0]*h[0]+n[1]*h[1]+n[2]*h[2];
544 if(tangent) nh= sasqrt(1.0f - nh*nh);
545 else if(nh<0.0f) return 0.0f;
546
547 nv= n[0]*v[0]+n[1]*v[1]+n[2]*v[2];
548 if(tangent) nv= sasqrt(1.0f - nv*nv);
549 else if(nv<0.0f) nv= 0.0f;
550
551 i= spec(nh, hard);
552
553 i= i/(0.1+nv);
554 return i;
555 }
556
557 /* Blinn spec */
558 static float Blinn_Spec(float *n, float *l, float *v, float refrac, float spec_power, int tangent)
559 {
560 float i, nh, nv, nl, vh, h[3];
561 float a, b, c, g=0.0f, p, f, ang;
562
563 if(refrac < 1.0f) return 0.0f;
564 if(spec_power == 0.0f) return 0.0f;
565
566 /* conversion from 'hardness' (1-255) to 'spec_power' (50 maps at 0.1) */
567 if(spec_power<100.0f)
568 spec_power= sqrt(1.0f/spec_power);
569 else spec_power= 10.0f/spec_power;
570
571 h[0]= v[0]+l[0];
572 h[1]= v[1]+l[1];
573 h[2]= v[2]+l[2];
574 Normalize(h);
575
576 nh= n[0]*h[0]+n[1]*h[1]+n[2]*h[2]; /* Dot product between surface normal and half-way vector */
577 if(tangent) nh= sasqrt(1.0f - nh*nh);
578 else if(nh<0.0f) return 0.0f;
579
580 nv= n[0]*v[0]+n[1]*v[1]+n[2]*v[2]; /* Dot product between surface normal and view vector */
581 if(tangent) nv= sasqrt(1.0f - nv*nv);
582 if(nv<=0.01f) nv= 0.01f; /* hrms... */
583
584 nl= n[0]*l[0]+n[1]*l[1]+n[2]*l[2]; /* Dot product between surface normal and light vector */
585 if(tangent) nl= sasqrt(1.0f - nl*nl);
586 if(nl<=0.01f) {
587 return 0.0f;
588 }
589
590 vh= v[0]*h[0]+v[1]*h[1]+v[2]*h[2]; /* Dot product between view vector and half-way vector */
591 if(vh<=0.0f) vh= 0.01f;
592
593 a = 1.0f;
594 b = (2.0f*nh*nv)/vh;
595 c = (2.0f*nh*nl)/vh;
596
597 if( a < b && a < c ) g = a;
598 else if( b < a && b < c ) g = b;
599 else if( c < a && c < b ) g = c;
600
601 p = sqrt( (double)((refrac * refrac)+(vh*vh)-1.0f) );
602 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))));
603 ang = saacos(nh);
604
605 i= f * g * exp((double)(-(ang*ang) / (2.0f*spec_power*spec_power)));
606 if(i<0.0f) i= 0.0f;
607
608 return i;
609 }
610
611 /* cartoon render spec */
612 static float Toon_Spec( float *n, float *l, float *v, float size, float smooth, int tangent)
613 {
614 float h[3];
615 float ang;
616 float rslt;
617
618 h[0] = l[0] + v[0];
619 h[1] = l[1] + v[1];
620 h[2] = l[2] + v[2];
621 Normalize(h);
622
623 rslt = h[0]*n[0] + h[1]*n[1] + h[2]*n[2];
624 if(tangent) rslt = sasqrt(1.0f - rslt*rslt);
625
626 ang = saacos( rslt );
627
628 if( ang < size ) rslt = 1.0f;
629 else if( ang >= (size + smooth) || smooth == 0.0f ) rslt = 0.0f;
630 else rslt = 1.0f - ((ang - size) / smooth);
631
632 return rslt;
633 }
634
635 /* Ward isotropic gaussian spec */
636 static float WardIso_Spec( float *n, float *l, float *v, float rms, int tangent)
637 {
638 float i, nh, nv, nl, h[3], angle, alpha;
639
640
641 /* half-way vector */
642 h[0] = l[0] + v[0];
643 h[1] = l[1] + v[1];
644 h[2] = l[2] + v[2];
645 Normalize(h);
646
647 nh = n[0]*h[0]+n[1]*h[1]+n[2]*h[2]; /* Dot product between surface normal and half-way vector */
648 if(tangent) nh = sasqrt(1.0f - nh*nh);
649 if(nh<=0.0f) nh = 0.001f;
650
651 nv = n[0]*v[0]+n[1]*v[1]+n[2]*v[2]; /* Dot product between surface normal and view vector */
652 if(tangent) nv = sasqrt(1.0f - nv*nv);
653 if(nv<=0.0f) nv = 0.001f;
654
655 nl = n[0]*l[0]+n[1]*l[1]+n[2]*l[2]; /* Dot product between surface normal and light vector */
656 if(tangent) nl = sasqrt(1.0f - nl*nl);
657 if(nl<=0.0f) nl = 0.001f;
658
659 angle = tan(saacos(nh));
660 alpha = MAX2(rms, 0.001f);
661
662 i= nl * (1.0f/(4.0f*M_PI*alpha*alpha)) * (exp( -(angle*angle)/(alpha*alpha))/(sqrt(nv*nl)));
663
664 return i;
665 }
666
667 /* cartoon render diffuse */
668 static float Toon_Diff( float *n, float *l, float *v, float size, float smooth )
669 {
670 float rslt, ang;
671
672 rslt = n[0]*l[0] + n[1]*l[1] + n[2]*l[2];
673
674 ang = saacos( (double)(rslt) );
675
676 if( ang < size ) rslt = 1.0f;
677 else if( ang >= (size + smooth) || smooth == 0.0f ) rslt = 0.0f;
678 else rslt = 1.0f - ((ang - size) / smooth);
679
680 return rslt;
681 }
682
683 /* Oren Nayar diffuse */
684
685 /* 'nl' is either dot product, or return value of area light */
686 /* in latter case, only last multiplication uses 'nl' */
687 static float OrenNayar_Diff(float nl, float *n, float *l, float *v, float rough )
688 {
689 float i, nh, nv, vh, realnl, h[3];
690 float a, b, t, A, B;
691 float Lit_A, View_A, Lit_B[3], View_B[3];
692
693 h[0]= v[0]+l[0];
694 h[1]= v[1]+l[1];
695 h[2]= v[2]+l[2];
696 Normalize(h);
697
698 nh= n[0]*h[0]+n[1]*h[1]+n[2]*h[2]; /* Dot product between surface normal and half-way vector */
699 if(nh<0.0f) nh = 0.0f;
700
701 nv= n[0]*v[0]+n[1]*v[1]+n[2]*v[2]; /* Dot product between surface normal and view vector */
702 if(nv<=0.0f) nv= 0.0f;
703
704 realnl= n[0]*l[0]+n[1]*l[1]+n[2]*l[2]; /* Dot product between surface normal and light vector */
705 if(realnl<=0.0f) return 0.0f;
706 if(nl<0.0f) return 0.0f; /* value from area light */
707
708 vh= v[0]*h[0]+v[1]*h[1]+v[2]*h[2]; /* Dot product between view vector and halfway vector */
709 if(vh<=0.0f) vh= 0.0f;
710
711 Lit_A = saacos(realnl);
712 View_A = saacos( nv );
713
714 Lit_B[0] = l[0] - (realnl * n[0]);
715 Lit_B[1] = l[1] - (realnl * n[1]);
716 Lit_B[2] = l[2] - (realnl * n[2]);
717 Normalize( Lit_B );
718
719 View_B[0] = v[0] - (nv * n[0]);
720 View_B[1] = v[1] - (nv * n[1]);
721 View_B[2] = v[2] - (nv * n[2]);
722 Normalize( View_B );
723
724 t = Lit_B[0]*View_B[0] + Lit_B[1]*View_B[1] + Lit_B[2]*View_B[2];
725 if( t < 0 ) t = 0;
726
727 if( Lit_A > View_A ) {
728 a = Lit_A;
729 b = View_A;
730 }
731 else {
732 a = View_A;
733 b = Lit_A;
734 }
735
736 A = 1.0f - (0.5f * ((rough * rough) / ((rough * rough) + 0.33f)));
737 B = 0.45f * ((rough * rough) / ((rough * rough) + 0.09f));
738
739 b*= 0.95f; /* prevent tangens from shooting to inf, 'nl' can be not a dot product here. */
740 /* overflow only happens with extreme size area light, and higher roughness */
741 i = nl * ( A + ( B * t * sin(a) * tan(b) ) );
742
743 return i;
744 }
745
746 /* Minnaert diffuse */
747 static float Minnaert_Diff(float nl, float *n, float *v, float darkness)
748 {
749
750 float i, nv;
751
752 /* nl = dot product between surface normal and light vector */
753 if (nl <= 0.0f)
754 return 0.0f;
755
756 /* nv = dot product between surface normal and view vector */
757 nv = n[0]*v[0]+n[1]*v[1]+n[2]*v[2];
758 if (nv < 0.0f)
759 nv = 0.0f;
760
761 if (darkness <= 1.0f)
762 i = nl * pow(MAX2(nv*nl, 0.1f), (darkness - 1.0f) ); /*The Real model*/
763 else
764 i = nl * pow( (1.001f - nv), (darkness - 1.0f) ); /*Nvidia model*/
765
766 return i;
767 }
768
769 static float Fresnel_Diff(float *vn, float *lv, float *view, float fac_i, float fac)
770 {
771 return fresnel_fac(lv, vn, fac_i, fac);
772 }
773
774 /* --------------------------------------------- */
775 /* also called from texture.c */
776 void calc_R_ref(ShadeInput *shi)
777 {
778 float i;
779
780 /* shi->vn dot shi->view */
781 i= -2*(shi->vn[0]*shi->view[0]+shi->vn[1]*shi->view[1]+shi->vn[2]*shi->view[2]);
782
783 shi->ref[0]= (shi->view[0]+i*shi->vn[0]);
784 shi->ref[1]= (shi->view[1]+i*shi->vn[1]);
785 shi->ref[2]= (shi->view[2]+i*shi->vn[2]);
786 if(shi->osatex) {
787 if(shi->vlr->flag & R_SMOOTH) {
788 i= -2*( (shi->vn[0]+shi->dxno[0])*(shi->view[0]+shi->dxview) +
789 (shi->vn[1]+shi->dxno[1])*shi->view[1]+ (shi->vn[2]+shi->dxno[2])*shi->view[2] );
790
791 shi->dxref[0]= shi->ref[0]- ( shi->view[0]+shi->dxview+i*(shi->vn[0]+shi->dxno[0]));
792 shi->dxref[1]= shi->ref[1]- (shi->view[1]+ i*(shi->vn[1]+shi->dxno[1]));
793 shi->dxref[2]= shi->ref[2]- (shi->view[2]+ i*(shi->vn[2]+shi->dxno[2]));
794
795 i= -2*( (shi->vn[0]+shi->dyno[0])*shi->view[0]+
796 (shi->vn[1]+shi->dyno[1])*(shi->view[1]+shi->dyview)+ (shi->vn[2]+shi->dyno[2])*shi->view[2] );
797
798 shi->dyref[0]= shi->ref[0]- (shi->view[0]+ i*(shi->vn[0]+shi->dyno[0]));
799 shi->dyref[1]= shi->ref[1]- (shi->view[1]+shi->dyview+i*(shi->vn[1]+shi->dyno[1]));
800 shi->dyref[2]= shi->ref[2]- (shi->view[2]+ i*(shi->vn[2]+shi->dyno[2]));
801
802 }
803 else {
804
805 i= -2*( shi->vn[0]*(shi->view[0]+shi->dxview) +
806 shi->vn[1]*shi->view[1]+ shi->vn[2]*shi->view[2] );
807
808 shi->dxref[0]= shi->ref[0]- (shi->view[0]+shi->dxview+i*shi->vn[0]);
809 shi->dxref[1]= shi->ref[1]- (shi->view[1]+ i*shi->vn[1]);
810 shi->dxref[2]= shi->ref[2]- (shi->view[2]+ i*shi->vn[2]);
811
812 i= -2*( shi->vn[0]*shi->view[0]+
813 shi->vn[1]*(shi->view[1]+shi->dyview)+ shi->vn[2]*shi->view[2] );
814
815 shi->dyref[0]= shi->ref[0]- (shi->view[0]+ i*shi->vn[0]);
816 shi->dyref[1]= shi->ref[1]- (shi->view[1]+shi->dyview+i*shi->vn[1]);
817 shi->dyref[2]= shi->ref[2]- (shi->view[2]+ i*shi->vn[2]);
818 }
819 }
820
821 }
822
823 /* called from ray.c */
824 void shade_color(ShadeInput *shi, ShadeResult *shr)
825 {
826 Material *ma= shi->mat;
827
828 if(ma->mode & (MA_VERTEXCOLP|MA_FACETEXTURE)) {
829 shi->r= shi->vcol[0];
830 shi->g= shi->vcol[1];
831 shi->b= shi->vcol[2];
832 if(ma->mode & (MA_FACETEXTURE_ALPHA))
833 shi->alpha= shi->vcol[3];
834 }
835
836 if(ma->texco)
837 do_material_tex(shi);
838
839 if(ma->fresnel_tra!=0.0f)
840 shi->alpha*= fresnel_fac(shi->view, shi->vn, ma->fresnel_tra_i, ma->fresnel_tra);
841
842 shr->diff[0]= shi->r;
843 shr->diff[1]= shi->g;
844 shr->diff[2]= shi->b;
845 shr->alpha= shi->alpha;
846 }
847
848 /* ramp for at end of shade */
849 static void ramp_diffuse_result(float *diff, ShadeInput *shi)
850 {
851 Material *ma= shi->mat;
852 float col[4], fac=0;
853
854 if(ma->ramp_col) {
855 if(ma->rampin_col==MA_RAMP_IN_RESULT) {
856
857 fac= 0.3*diff[0] + 0.58*diff[1] + 0.12*diff[2];
858 do_colorband(ma->ramp_col, fac, col);
859
860 /* blending method */
861 fac= col[3]*ma->rampfac_col;
862
863 ramp_blend(ma->rampblend_col, diff, diff+1, diff+2, fac, col);
864 }
865 }
866 }
867
868 /* r,g,b denote energy, ramp is used with different values to make new material color */
869 static void add_to_diffuse(float *diff, ShadeInput *shi, float is, float r, float g, float b)
870 {
871 Material *ma= shi->mat;
872 float col[4], colt[3], fac=0;
873
874 if(ma->ramp_col && (ma->mode & MA_RAMP_COL)) {
875
876 /* MA_RAMP_IN_RESULT is exceptional */
877 if(ma->rampin_col==MA_RAMP_IN_RESULT) {
878 // normal add
879 diff[0] += r * shi->r;
880 diff[1] += g * shi->g;
881 diff[2] += b * shi->b;
882 }
883 else {
884 /* input */
885 switch(ma->rampin_col) {
886 case MA_RAMP_IN_ENERGY:
887 fac= 0.3*r + 0.58*g + 0.12*b;
888 break;
889 case MA_RAMP_IN_SHADER:
890 fac= is;
891 break;
892 case MA_RAMP_IN_NOR:
893 fac= shi->view[0]*shi->vn[0] + shi->view[1]*shi->vn[1] + shi->view[2]*shi->vn[2];
894 break;
895 }
896
897 do_colorband(ma->ramp_col, fac, col);
898
899 /* blending method */
900 fac= col[3]*ma->rampfac_col;
901 colt[0]= shi->r;
902 colt[1]= shi->g;
903 colt[2]= shi->b;
904
905 ramp_blend(ma->rampblend_col, colt, colt+1, colt+2, fac, col);
906
907 /* output to */
908 diff[0] += r * colt[0];
909 diff[1] += g * colt[1];
910 diff[2] += b * colt[2];
911 }
912 }
913 else {
914 diff[0] += r * shi->r;
915 diff[1] += g * shi->g;
916 diff[2] += b * shi->b;
917 }
918 }
919
920 static void ramp_spec_result(float *specr, float *specg, float *specb, ShadeInput *shi)
921 {
922 Material *ma= shi->mat;
923 float col[4];
924 float fac;
925
926 if(ma->ramp_spec && (ma->rampin_spec==MA_RAMP_IN_RESULT)) {
927 fac= 0.3*(*specr) + 0.58*(*specg) + 0.12*(*specb);
928 do_colorband(ma->ramp_spec, fac, col);
929
930 /* blending method */
931 fac= col[3]*ma->rampfac_spec;
932
933 ramp_blend(ma->rampblend_spec, specr, specg, specb, fac, col);
934
935 }
936 }
937
938 /* is = dot product shade, t = spec energy */
939 static void do_specular_ramp(ShadeInput *shi, float is, float t, float *spec)
940 {
941 Material *ma= shi->mat;
942 float col[4];
943 float fac=0.0f;
944
945 spec[0]= shi->specr;
946 spec[1]= shi->specg;
947 spec[2]= shi->specb;
948
949 /* MA_RAMP_IN_RESULT is exception */
950 if(ma->ramp_spec && (ma->rampin_spec!=MA_RAMP_IN_RESULT)) {
951
952 /* input */
953 switch(ma->rampin_spec) {
954 case MA_RAMP_IN_ENERGY:
955 fac= t;
956 break;
957 case MA_RAMP_IN_SHADER:
958 fac= is;
959 break;
960 case MA_RAMP_IN_NOR:
961 fac= shi->view[0]*shi->vn[0] + shi->view[1]*shi->vn[1] + shi->view[2]*shi->vn[2];
962 break;
963 }
964
965 do_colorband(ma->ramp_spec, fac, col);
966
967 /* blending method */
968 fac= col[3]*ma->rampfac_spec;
969
970 ramp_blend(ma->rampblend_spec, spec, spec+1, spec+2, fac, col);
971 }
972 }
973
974 /* pure AO, check for raytrace and world should have been done */
975 void ambient_occlusion(ShadeInput *shi)
976 {
977
978 if((R.r.mode & R_RAYTRACE) && shi->mat->amb!=0.0f)
979 ray_ao(shi, shi->ao);
980 else
981 shi->ao[0]= shi->ao[1]= shi->ao[2]= 1.0f;
982 }
983
984
985 /* wrld mode was checked for */
986 void ambient_occlusion_to_diffuse(ShadeInput *shi, float *diff)
987 {
988
989 if((R.r.mode & R_RAYTRACE) && shi->mat->amb!=0.0f) {
990 float f= R.wrld.aoenergy*shi->mat->amb;
991
992 if (R.wrld.aomix==WO_AOADDSUB) {
993 diff[0] = 2.0f*shi->ao[0]-1.0f;
994 diff[1] = 2.0f*shi->ao[1]-1.0f;
995 diff[2] = 2.0f*shi->ao[2]-1.0f;
996 }
997 else if (R.wrld.aomix==WO_AOSUB) {
998 diff[0] = shi->ao[0]-1.0f;
999 diff[1] = shi->ao[1]-1.0f;
1000 diff[2] = shi->ao[2]-1.0f;
1001 }
1002 else {
1003 VECCOPY(diff, shi->ao);
1004 }
1005
1006 VECMUL(diff, f);
1007 }
1008 else
1009 diff[0]= diff[1]= diff[2]= 0.0f;
1010 }
1011
1012 /* result written in shadfac */
1013 void lamp_get_shadow(LampRen *lar, ShadeInput *shi, float inp, float *shadfac, int do_real)
1014 {
1015 LampShadowSubSample *lss= &(lar->shadsamp[shi->thread].s[shi->sample]);
1016
1017 if(do_real || lss->samplenr!=shi->samplenr) {
1018
1019 shadfac[0]= shadfac[1]= shadfac[2]= shadfac[3]= 1.0f;
1020
1021 if(lar->shb) {
1022 if(lar->buftype==LA_SHADBUF_IRREGULAR)
1023 shadfac[3]= ISB_getshadow(shi, lar->shb);
1024 else
1025 shadfac[3] = testshadowbuf(lar->shb, shi->co, shi->dxco, shi->dyco, inp);
1026 }
1027 else if(lar->mode & LA_SHAD_RAY) {
1028 ray_shadow(shi, lar, shadfac);
1029 }
1030
1031 if(shi->depth==0) {
1032 QUATCOPY(lss->shadfac, shadfac);
1033 lss->samplenr= shi->samplenr;
1034 }
1035 }
1036 else {
1037 QUATCOPY(shadfac, lss->shadfac);
1038 }
1039 }
1040
1041 /* lampdistance and spot angle, writes in lv and dist */
1042 float lamp_get_visibility(LampRen *lar, float *co, float *lv, float *dist)
1043 {
1044 if(lar->type==LA_SUN || lar->type==LA_HEMI) {
1045 *dist= 1.0f;
1046 VECCOPY(lv, lar->vec);
1047 return 1.0f;
1048 }
1049 else {
1050 float visifac= 1.0f, t;
1051
1052 VECSUB(lv, co, lar->co);
1053 *dist= sqrt( INPR(lv, lv));
1054 t= 1.0f/dist[0];
1055 VECMUL(lv, t);
1056
1057 /* area type has no quad or sphere option */
1058 if(lar->type==LA_AREA) {
1059 /* area is single sided */
1060 if(INPR(lv, lar->vec) > 0.0f)
1061 visifac= 1.0f;
1062 else
1063 visifac= 0.0f;
1064 }
1065 else {
1066 switch(lar->falloff_type)
1067 {
1068 case LA_FALLOFF_CONSTANT:
1069 visifac = 1.0f;
1070 break;
1071 case LA_FALLOFF_INVLINEAR:
1072 visifac = lar->dist/(lar->dist + dist[0]);
1073 break;
1074 case LA_FALLOFF_INVSQUARE:
1075 visifac = lar->dist / (lar->dist + dist[0]*dist[0]);
1076 break;
1077 case LA_FALLOFF_SLIDERS:
1078 if(lar->ld1>0.0f)
1079 visifac= lar->dist/(lar->dist+lar->ld1*dist[0]);
1080 if(lar->ld2>0.0f)
1081 visifac*= lar->distkw/(lar->distkw+lar->ld2*dist[0]*dist[0]);
1082 break;
1083 case LA_FALLOFF_CURVE:
1084 visifac = curvemapping_evaluateF(lar->curfalloff, 0, dist[0]/lar->dist);
1085 break;
1086 }
1087
1088 if(lar->mode & LA_SPHERE) {
1089 float t= lar->dist - dist[0];
1090 if(t<=0.0f)
1091 visifac= 0.0f;
1092 else
1093 visifac*= t/lar->dist;
1094 }
1095
1096 if(visifac > 0.0f) {
1097 if(lar->type==LA_SPOT) {
1098 float inpr;
1099
1100 if(lar->mode & LA_SQUARE) {
1101 if(lv[0]*lar->vec[0]+lv[1]*lar->vec[1]+lv[2]*lar->vec[2]>0.0f) {
1102 float lvrot[3], x;
1103
1104 /* rotate view to lampspace */
1105 VECCOPY(lvrot, lv);
1106 MTC_Mat3MulVecfl(lar->imat, lvrot);
1107
1108 x= MAX2(fabs(lvrot[0]/lvrot[2]) , fabs(lvrot[1]/lvrot[2]));
1109 /* 1.0f/(sqrt(1+x*x)) is equivalent to cos(atan(x)) */
1110
1111 inpr= 1.0f/(sqrt(1.0f+x*x));
1112 }
1113 else inpr= 0.0f;
1114 }
1115 else {
1116 inpr= lv[0]*lar->vec[0]+lv[1]*lar->vec[1]+lv[2]*lar->vec[2];
1117 }
1118
1119 t= lar->spotsi;
1120 if(inpr<=t)
1121 visifac= 0.0f;
1122 else {
1123 t= inpr-t;
1124 if(t<lar->spotbl && lar->spotbl!=0.0f) {
1125 /* soft area */
1126 float i= t/lar->spotbl;
1127 t= i*i;
1128 inpr*= (3.0f*t-2.0f*t*i);
1129 }
1130 visifac*= inpr;
1131 }
1132 }
1133 }
1134 }
1135 if (visifac <= 0.001) visifac = 0.0f;
1136 return visifac;
1137 }
1138 }
1139
1140 /* function returns raw diff, spec and full shadowed diff in the 'shad' pass */
1141 static void shade_one_light(LampRen *lar, ShadeInput *shi, ShadeResult *shr, int passflag)
1142 {
1143 Material *ma= shi->mat;
1144 VlakRen *vlr= shi->vlr;
1145 float lv[3], lampdist, lacol[3], shadfac[4];
1146 float i, is, i_noshad, inp, *vn, *view, vnor[3], phongcorr=1.0f;
1147 float visifac;
1148
1149 vn= shi->vn;
1150 view= shi->view;
1151
1152 /* optimisation, don't render fully black lamps */
1153 if (!(lar->mode & LA_TEXTURE) && (lar->r + lar->g + lar->b == 0.0f))
1154 return;
1155
1156 if (lar->energy == 0.0) return;
1157
1158 /* lampdist, spot angle, area side, ... */
1159 visifac= lamp_get_visibility(lar, shi->co, lv, &lampdist);
1160 if(visifac==0.0f)
1161 return;
1162
1163 if(lar->type==LA_SPOT) {
1164 if(lar->mode & LA_OSATEX) {
1165 shi->osatex= 1; /* signal for multitex() */
1166
1167 shi->dxlv[0]= lv[0] - (shi->co[0]-lar->co[0]+shi->dxco[0])/lampdist;
1168 shi->dxlv[1]= lv[1] - (shi->co[1]-lar->co[1]+shi->dxco[1])/lampdist;
1169 shi->dxlv[2]= lv[2] - (shi->co[2]-lar->co[2]+shi->dxco[2])/lampdist;
1170
1171 shi->dylv[0]= lv[0] - (shi->co[0]-lar->co[0]+shi->dyco[0])/lampdist;
1172 shi->dylv[1]= lv[1] - (shi->co[1]-lar->co[1]+shi->dyco[1])/lampdist;
1173 shi->dylv[2]= lv[2] - (shi->co[2]-lar->co[2]+shi->dyco[2])/lampdist;
1174 }
1175 }
1176
1177 /* lamp color texture */
1178 lacol[0]= lar->r;
1179 lacol[1]= lar->g;
1180 lacol[2]= lar->b;
1181
1182 if(lar->mode & LA_TEXTURE) do_lamp_tex(lar, lv, shi, lacol);
1183
1184 /* tangent case; calculate fake face normal, aligned with lampvector */
1185 /* note, vnor==vn is used as tangent trigger for buffer shadow */
1186 if(vlr->flag & R_TANGENT) {
1187 float cross[3];
1188 Crossf(cross, lv, vn);
1189 Crossf(vnor, cross, vn);
1190 vnor[0]= -vnor[0];vnor[1]= -vnor[1];vnor[2]= -vnor[2];
1191 vn= vnor;
1192 }
1193 else if (ma->mode & MA_TANGENT_V) {
1194 float cross[3];
1195 Crossf(cross, lv, shi->tang);
1196 Crossf(vnor, cross, shi->tang);
1197 vnor[0]= -vnor[0];vnor[1]= -vnor[1];vnor[2]= -vnor[2];
1198 vn= vnor;
1199 }
1200
1201 /* dot product and reflectivity */
1202 /* inp = dotproduct, is = shader result, i = lamp energy (with shadow), i_noshad = i without shadow */
1203 inp= vn[0]*lv[0] + vn[1]*lv[1] + vn[2]*lv[2];
1204
1205 /* phong threshold to prevent backfacing faces having artefacts on ray shadow (terminator problem) */
1206 /* this complex construction screams for a nicer implementation! (ton) */
1207 if(R.r.mode & R_SHADOW) {
1208 if(ma->mode & MA_SHADOW) {
1209 if(lar->type==LA_HEMI);
1210 else if((ma->mode & MA_RAYBIAS) && (lar->mode & LA_SHAD_RAY) && (vlr->flag & R_SMOOTH)) {
1211 float thresh= vlr->ob->smoothresh;
1212 if(inp>thresh)
1213 phongcorr= (inp-thresh)/(inp*(1.0f-thresh));
1214 else
1215 phongcorr= 0.0f;
1216 }
1217 else if(ma->sbias!=0.0f && ((lar->mode & LA_SHAD_RAY) || lar->shb)) {
1218 if(inp>ma->sbias)
1219 phongcorr= (inp-ma->sbias)/(inp*(1.0f-ma->sbias));
1220 else
1221 phongcorr= 0.0f;
1222 }
1223 }
1224 }
1225
1226 /* diffuse shaders */
1227 if(lar->mode & LA_NO_DIFF) {
1228 is= 0.0f; // skip shaders
1229 }
1230 else if(lar->type==LA_HEMI) {
1231 is= 0.5f*inp + 0.5f;
1232 }
1233 else {
1234
1235 if(lar->type==LA_AREA)
1236 inp= area_lamp_energy(shi->co, vn, lar);
1237
1238 /* diffuse shaders (oren nayer gets inp from area light) */
1239 if(ma->diff_shader==MA_DIFF_ORENNAYAR) is= OrenNayar_Diff(inp, vn, lv, view, ma->roughness);
1240 else if(ma->diff_shader==MA_DIFF_TOON) is= Toon_Diff(vn, lv, view, ma->param[0], ma->param[1]);
1241 else if(ma->diff_shader==MA_DIFF_MINNAERT) is= Minnaert_Diff(inp, vn, view, ma->darkness);
1242 else if(ma->diff_shader==MA_DIFF_FRESNEL) is= Fresnel_Diff(vn, lv, view, ma->param[0], ma->param[1]);
1243 else is= inp; // Lambert
1244 }
1245
1246 /* 'is' is diffuse */
1247 if((ma->shade_flag & MA_CUBIC) && is>0.0f && is<1.0f)
1248 is= 3.0*is*is - 2.0*is*is*is; // nicer termination of shades
1249
1250 i= is*phongcorr;
1251
1252 if(i>0.0f) {
1253 i*= visifac*shi->refl;
1254 }
1255 i_noshad= i;
1256
1257 vn= shi->vn; // bring back original vector, we use special specular shaders for tangent
1258 if(ma->mode & MA_TANGENT_V)
1259 vn= shi->tang;
1260
1261 /* init transp shadow */
1262 shadfac[0]= shadfac[1]= shadfac[2]= shadfac[3]= 1.0f;
1263
1264 /* shadow and spec, (visifac==0 outside spot) */
1265 if(visifac> 0.0f) {
1266
1267 if((R.r.mode & R_SHADOW)) {
1268 if(ma->mode & MA_SHADOW) {
1269 if(lar->shb || (lar->mode & LA_SHAD_RAY)) {
1270
1271 if(vn==vnor) /* tangent trigger */
1272 lamp_get_shadow(lar, shi, INPR(shi->vn, lv), shadfac, shi->depth);
1273 else
1274 lamp_get_shadow(lar, shi, inp, shadfac, shi->depth);
1275
1276 /* warning, here it skips the loop */
1277 if((lar->mode & LA_ONLYSHADOW) && i>0.0) {
1278
1279 shadfac[3]= i*lar->energy*(1.0f-shadfac[3]);
1280 shr->shad[0] -= shadfac[3]*shi->r;
1281 shr->shad[1] -= shadfac[3]*shi->g;
1282 shr->shad[2] -= shadfac[3]*shi->b;
1283
1284 shr->spec[0] -= shadfac[3]*shi->specr;
1285 shr->spec[1] -= shadfac[3]*shi->specg;
1286 shr->spec[2] -= shadfac[3]*shi->specb;
1287
1288 return;
1289 }
1290
1291 i*= shadfac[3];
1292 }
1293 }
1294 }
1295
1296 /* in case 'no diffuse' we still do most calculus, spec can be in shadow.*/
1297 if(!(lar->mode & LA_NO_DIFF)) {
1298 if(i>0.0f) {
1299 if(ma->mode & MA_SHADOW_TRA)
1300 add_to_diffuse(shr->shad, shi, is, i*shadfac[0]*lacol[0], i*shadfac[1]*lacol[1], i*shadfac[2]*lacol[2]);
1301 else
1302 add_to_diffuse(shr->shad, shi, is, i*lacol[0], i*lacol[1], i*lacol[2]);
1303 }
1304 if(i_noshad>0.0f) {
1305 if(passflag & (SCE_PASS_DIFFUSE|SCE_PASS_SHADOW)) {
1306 if(ma->mode & MA_SHADOW_TRA)
1307 add_to_diffuse(shr->diff, shi, is, i_noshad*shadfac[0]*lacol[0], i_noshad*shadfac[1]*lacol[1], i_noshad*shadfac[2]*lacol[2]);
1308 else
1309 add_to_diffuse(shr->diff, shi, is, i_noshad*lacol[0], i_noshad*lacol[1], i_noshad*lacol[2]);
1310 }
1311 else
1312 VECCOPY(shr->diff, shr->shad);
1313 }
1314 }
1315
1316 /* specularity */
1317 if(shadfac[3]>0.0f && shi->spec!=0.0f && !(lar->mode & LA_NO_SPEC) && !(lar->mode & LA_ONLYSHADOW)) {
1318
1319 if(!(passflag & (SCE_PASS_COMBINED|SCE_PASS_SPEC)));
1320 else if(lar->type==LA_HEMI) {
1321 float t;
1322 /* hemi uses no spec shaders (yet) */
1323
1324 lv[0]+= view[0];
1325 lv[1]+= view[1];
1326 lv[2]+= view[2];
1327
1328 Normalize(lv);
1329
1330 t= vn[0]*lv[0]+vn[1]*lv[1]+vn[2]*lv[2];
1331
1332 if(lar->type==LA_HEMI) {
1333 t= 0.5*t+0.5;
1334 }
1335
1336 t= shadfac[3]*shi->spec*spec(t, shi->har);
1337
1338 shr->spec[0]+= t*(lacol[0] * shi->specr);
1339 shr->spec[1]+= t*(lacol[1] * shi->specg);
1340 shr->spec[2]+= t*(lacol[2] * shi->specb);
1341 }
1342 else {
1343 /* specular shaders */
1344 float specfac, t;
1345
1346 if(ma->spec_shader==MA_SPEC_PHONG)
1347 specfac= Phong_Spec(vn, lv, view, shi->har, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1348 else if(ma->spec_shader==MA_SPEC_COOKTORR)
1349 specfac= CookTorr_Spec(vn, lv, view, shi->har, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1350 else if(ma->spec_shader==MA_SPEC_BLINN)
1351 specfac= Blinn_Spec(vn, lv, view, ma->refrac, (float)shi->har, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1352 else if(ma->spec_shader==MA_SPEC_WARDISO)
1353 specfac= WardIso_Spec( vn, lv, view, ma->rms, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1354 else
1355 specfac= Toon_Spec(vn, lv, view, ma->param[2], ma->param[3], (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1356
1357 /* area lamp correction */
1358 if(lar->type==LA_AREA) specfac*= inp;
1359
1360 t= shadfac[3]*shi->spec*visifac*specfac;
1361
1362 if(ma->mode & MA_RAMP_SPEC) {
1363 float spec[3];
1364 do_specular_ramp(shi, specfac, t, spec);
1365 shr->spec[0]+= t*(lacol[0] * spec[0]);
1366 shr->spec[1]+= t*(lacol[1] * spec[1]);
1367 shr->spec[2]+= t*(lacol[2] * spec[2]);
1368 }
1369 else {
1370 shr->spec[0]+= t*(lacol[0] * shi->specr);
1371 shr->spec[1]+= t*(lacol[1] * shi->specg);
1372 shr->spec[2]+= t*(lacol[2] * shi->specb);
1373 }
1374 }
1375 }
1376 }
1377 }
1378
1379 static void shade_lamp_loop_only_shadow(ShadeInput *shi, ShadeResult *shr)
1380 {
1381
1382 if(R.r.mode & R_SHADOW) {
1383 ListBase *lights;
1384 LampRen *lar;
1385 GroupObject *go;
1386 float inpr, lv[3];
1387 float *vn, *view, shadfac[4];
1388 float ir, accum, visifac, lampdist;
1389
1390 vn= shi->vn;
1391 view= shi->view;
1392
1393 accum= ir= 0.0f;
1394
1395 lights= get_lights(shi);
1396 for(go=lights->first; go; go= go->next) {
1397 lar= go->lampren;
1398 if(lar==NULL) continue;
1399
1400 /* yafray: ignore shading by photonlights, not used in Blender */
1401 if (lar->type==LA_YF_PHOTON) continue;
1402
1403 if(lar->mode & LA_LAYER) if((lar->lay & shi->vlr->lay)==0) continue;
1404 if((lar->lay & shi->lay)==0) continue;
1405
1406 if(lar->shb || (lar->mode & LA_SHAD_RAY)) {
1407 visifac= lamp_get_visibility(lar, shi->co, lv, &lampdist);
1408 if(visifac <= 0.0f) {
1409 ir+= 1.0f;
1410 accum+= 1.0f;
1411 continue;
1412 }
1413 inpr= INPR(shi->vn, lv);
1414 if(inpr <= 0.0f) {
1415 ir+= 1.0f;
1416 accum+= 1.0f;
1417 continue;
1418 }
1419 lamp_get_shadow(lar, shi, inpr, shadfac, shi->depth);
1420
1421 ir+= 1.0f;
1422 accum+= (1.0f-visifac) + (visifac)*shadfac[3];
1423 }
1424 }
1425 if(ir>0.0f) {
1426 accum/= ir;
1427 shr->alpha= (shi->mat->alpha)*(1.0f-accum);
1428 }
1429 else shr->alpha= shi->mat->alpha;
1430 }
1431
1432 /* quite disputable this... also note it doesn't mirror-raytrace */
1433 if((R.wrld.mode & WO_AMB_OCC) && shi->amb!=0.0f) {
1434 float f;
1435
1436 f= 1.0f - shi->ao[0];
1437 f= R.wrld.aoenergy*f*shi->amb;
1438
1439 if(R.wrld.aomix==WO_AOADD) {
1440 shr->alpha += f;
1441 shr->alpha *= f;
1442 }
1443 else if(R.wrld.aomix==WO_AOSUB) {
1444 shr->alpha += f;
1445 }
1446 else {
1447 shr->alpha *= f;
1448 shr->alpha += f;
1449 }
1450 }
1451 }
1452
1453 static void wrld_exposure_correct(float *diff)
1454 {
1455 diff[0]= R.wrld.linfac*(1.0f-exp( diff[0]*R.wrld.logfac) );
1456 diff[1]= R.wrld.linfac*(1.0f-exp( diff[1]*R.wrld.logfac) );
1457 diff[2]= R.wrld.linfac*(1.0f-exp( diff[2]*R.wrld.logfac) );
1458 }
1459
1460 void shade_lamp_loop(ShadeInput *shi, ShadeResult *shr)
1461 {
1462 Material *ma= shi->mat;
1463 VlakRen *vlr= shi->vlr;
1464 int passflag= shi->passflag;
1465
1466 memset(shr, 0, sizeof(ShadeResult));
1467
1468 /* separate loop */
1469 if(ma->mode & MA_ONLYSHADOW) {
1470 shade_lamp_loop_only_shadow(shi, shr);
1471 return;
1472 }
1473
1474 /* envmap hack, always reset */
1475 shi->refcol[0]= shi->refcol[1]= shi->refcol[2]= shi->refcol[3]= 0.0f;
1476
1477 /* material color itself */
1478 if(passflag & (SCE_PASS_COMBINED|SCE_PASS_RGBA)) {
1479 if(ma->mode & (MA_VERTEXCOLP|MA_FACETEXTURE)) {
1480 shi->r= shi->vcol[0];
1481 shi->g= shi->vcol[1];
1482 shi->b= shi->vcol[2];
1483 if(ma->mode & (MA_FACETEXTURE_ALPHA))
1484 shi->alpha= shi->vcol[3];
1485 }
1486 if(ma->texco)
1487 do_material_tex(shi);
1488
1489 shr->col[0]= shi->r*shi->alpha;
1490 shr->col[1]= shi->g*shi->alpha;
1491 shr->col[2]= shi->b*shi->alpha;
1492 shr->col[3]= shi->alpha;
1493 }
1494
1495 if(ma->mode & MA_SHLESS) {
1496 shr->combined[0]= shi->r;
1497 shr->combined[1]= shi->g;
1498 shr->combined[2]= shi->b;
1499 shr->alpha= shi->alpha;
1500 return;
1501 }
1502
1503 if( (ma->mode & (MA_VERTEXCOL|MA_VERTEXCOLP))== MA_VERTEXCOL ) { // vertexcolor light
1504 shr->diff[0]= shi->r*(shi->emit+shi->vcol[0]);
1505 shr->diff[1]= shi->g*(shi->emit+shi->vcol[1]);
1506 shr->diff[2]= shi->b*(shi->emit+shi->vcol[2]);
1507 }
1508 else {
1509 shr->diff[0]= shi->r*shi->emit;
1510 shr->diff[1]= shi->g*shi->emit;
1511 shr->diff[2]= shi->b*shi->emit;
1512 }
1513 VECCOPY(shr->shad, shr->diff);
1514
1515 /* AO pass */
1516 if(R.wrld.mode & WO_AMB_OCC) {
1517 if(((passflag & SCE_PASS_COMBINED) && (shi->combinedflag & SCE_PASS_AO))
1518 || (passflag & SCE_PASS_AO)) {
1519 /* AO was calculated for scanline already */
1520 if(shi->depth)
1521 ambient_occlusion(shi);
1522 VECCOPY(shr->ao, shi->ao);
1523 }
1524 }
1525
1526 /* lighting pass */
1527 if(passflag & (SCE_PASS_COMBINED|SCE_PASS_DIFFUSE|SCE_PASS_SPEC|SCE_PASS_SHADOW)) {
1528 GroupObject *go;
1529 ListBase *lights;
1530 LampRen *lar;
1531
1532 lights= get_lights(shi);
1533 for(go=lights->first; go; go= go->next) {
1534 lar= go->lampren;
1535 if(lar==NULL) continue;
1536
1537 /* yafray: ignore shading by photonlights, not used in Blender */
1538 if (lar->type==LA_YF_PHOTON) continue;
1539
1540 /* test for lamp layer */
1541 if(lar->mode & LA_LAYER) if((lar->lay & vlr->lay)==0) continue;
1542 if((lar->lay & shi->lay)==0) continue;
1543
1544 /* accumulates in shr->diff and shr->spec and shr->shad (diffuse with shadow!) */
1545 shade_one_light(lar, shi, shr, passflag);
1546 }
1547
1548 /*this check is to prevent only shadow lamps from producing negative
1549 colors.*/
1550 if (shr->spec[0] < 0) shr->spec[0] = 0;
1551 if (shr->spec[1] < 0) shr->spec[1] = 0;
1552 if (shr->spec[2] < 0) shr->spec[2] = 0;
1553
1554 if (shr->shad[0] < 0) shr->shad[0] = 0;
1555 if (shr->shad[1] < 0) shr->shad[1] = 0;
1556 if (shr->shad[2] < 0) shr->shad[2] = 0;
1557
1558 if(ma->sss_flag & MA_DIFF_SSS) {
1559 float sss[3], col[3], texfac= ma->sss_texfac;
1560
1561 /* this will return false in the preprocess stage */
1562 if(sample_sss(&R, ma, shi->co, sss)) {
1563 if(texfac==0.0f) {
1564 VECCOPY(col, shr->col);
1565 }
1566 else if(texfac==1.0f) {
1567 col[0]= col[1]= col[2]= 1.0f;
1568 }
1569 else {
1570 col[0]= pow(shr->col[0], 1.0f-texfac);
1571 col[1]= pow(shr->col[1], 1.0f-texfac);
1572 col[2]= pow(shr->col[2], 1.0f-texfac);
1573 }
1574
1575 shr->diff[0]= sss[0]*col[0];
1576 shr->diff[1]= sss[1]*col[1];
1577 shr->diff[2]= sss[2]*col[2];
1578
1579 if(shi->combinedflag & SCE_PASS_SHADOW) {
1580 shr->shad[0]= sss[0]*col[0];
1581 shr->shad[1]= sss[1]*col[1];
1582 shr->shad[2]= sss[2]*col[2];
1583 }
1584 }
1585 }
1586
1587 if(shi->combinedflag & SCE_PASS_SHADOW)
1588 VECCOPY(shr->combined, shr->shad) /* note, no ';' ! */
1589 else
1590 VECCOPY(shr->combined, shr->diff);
1591
1592 /* calculate shadow pass, we use a multiplication mask */
1593 if(passflag & SCE_PASS_SHADOW) {
1594 if(shr->diff[0]!=0.0f) shr->shad[0]= shr->shad[0]/shr->diff[0];
1595 if(shr->diff[1]!=0.0f) shr->shad[1]= shr->shad[1]/shr->diff[1];
1596 if(shr->diff[2]!=0.0f) shr->shad[2]= shr->shad[2]/shr->diff[2];
1597 }
1598
1599 /* exposure correction */
1600 if((R.wrld.exp!=0.0f || R.wrld.range!=1.0f) && !R.sss_points) {
1601 wrld_exposure_correct(shr->combined); /* has no spec! */
1602 wrld_exposure_correct(shr->spec);
1603 }
1604 }
1605
1606 /* alpha in end, spec can influence it */
1607 if(passflag & (SCE_PASS_COMBINED)) {
1608 if(ma->fresnel_tra!=0.0f)
1609 shi->alpha*= fresnel_fac(shi->view, shi->vn, ma->fresnel_tra_i, ma->fresnel_tra);
1610
1611 /* note: shi->mode! */
1612 if(shi->mode & (MA_ZTRA|MA_RAYTRANSP)) {
1613 if(shi->spectra!=0.0f) {
1614 float t = MAX3(shr->spec[0], shr->spec[1], shr->spec[2]);
1615 t *= shi->spectra;
1616 if(t>1.0f) t= 1.0f;
1617 shi->alpha= (1.0f-t)*shi->alpha+t;
1618 }
1619 }
1620 }
1621 shr->alpha= shi->alpha;
1622
1623 /* from now stuff everything in shr->combined: ambient, AO, radio, ramps, exposure */
1624 if(!(ma->sss_flag & MA_DIFF_SSS) || !has_sss_tree(&R, ma)) {
1625 shr->combined[0]+= shi->ambr;
1626 shr->combined[1]+= shi->ambg;
1627 shr->combined[2]+= shi->ambb;
1628
1629 if(shi->combinedflag & SCE_PASS_RADIO) {
1630 shr->combined[0]+= shi->r*shi->amb*shi->rad[0];
1631 shr->combined[1]+= shi->g*shi->amb*shi->rad[1];
1632 shr->combined[2]+= shi->b*shi->amb*shi->rad[2];
1633 }
1634
1635 /* add AO in combined? */
1636 if(R.wrld.mode & WO_AMB_OCC) {
1637 if(shi->combinedflag & SCE_PASS_AO) {
1638 float aodiff[3];
1639 ambient_occlusion_to_diffuse(shi, aodiff);
1640
1641 shr->combined[0] += shi->r*aodiff[0];
1642 shr->combined[1] += shi->g*aodiff[1];
1643 shr->combined[2] += shi->b*aodiff[2];
1644 }
1645 }
1646
1647 if(ma->mode & MA_RAMP_COL) ramp_diffuse_result(shr->combined, shi);
1648 }
1649
1650 if(ma->mode & MA_RAMP_SPEC) ramp_spec_result(shr->spec, shr->spec+1, shr->spec+2, shi);
1651
1652 /* refcol is for envmap only */
1653 if(shi->refcol[0]!=0.0f) {
1654 float result[3];
1655
1656 result[0]= shi->mirr*shi->refcol[1] + (1.0f - shi->mirr*shi->refcol[0])*shr->combined[0];
1657 result[1]= shi->mirg*shi->refcol[2] + (1.0f - shi->mirg*shi->refcol[0])*shr->combined[1];
1658 result[2]= shi->mirb*shi->refcol[3] + (1.0f - shi->mirb*shi->refcol[0])*shr->combined[2];
1659
1660 if(passflag & SCE_PASS_REFLECT)
1661 VECSUB(shr->refl, result, shr->combined);
1662
1663 if(shi->combinedflag & SCE_PASS_REFLECT)
1664 VECCOPY(shr->combined, result);
1665
1666 }
1667
1668 /* and add spec */
1669 if(shi->combinedflag & SCE_PASS_SPEC)
1670 VECADD(shr->combined, shr->combined, shr->spec);
1671
1672 shr->combined[3]= shr->alpha;
1673 }
1674
1675
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