source/blender/render/intern/source/shadeoutput.c

   1 /*
   2  * ***** BEGIN GPL LICENSE BLOCK *****
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  *
  18  * The Original Code is Copyright (C) 2006 Blender Foundation
  19  * All rights reserved.
  20  *
  21  * Contributors: Hos, Robert Wenzlaff.
  22  *
  23  * ***** END GPL LICENSE BLOCK *****
  24  */
  25
  26 /** \file blender/render/intern/source/shadeoutput.c
  27  *  \ingroup render
  28  */
  29
  30
  31 #include <stdio.h>
  32 #include <float.h>
  33 #include <math.h>
  34 #include <string.h>
  35
  36 #include "BLI_math.h"
  37 #include "BLI_utildefines.h"
  38
  39 #include "BKE_colortools.h"
  40 #include "BKE_material.h"
  41 #include "BKE_texture.h"
  42
  43
  44 #include "DNA_group_types.h"
  45 #include "DNA_lamp_types.h"
  46 #include "DNA_material_types.h"
  47
  48 /* local include */
  49 #include "occlusion.h"
  50 #include "renderpipeline.h"
  51 #include "render_types.h"
  52 #include "pixelblending.h"
  53 #include "rendercore.h"
  54 #include "shadbuf.h"
  55 #include "sss.h"
  56 #include "texture.h"
  57
  58 #include "shading.h" /* own include */
  59
  60 /* could enable at some point but for now there are far too many conversions */
  61 #ifdef __GNUC__
  62 #  pragma GCC diagnostic ignored "-Wdouble-promotion"
  63 #endif
  64
  65 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
  66 /* defined in pipeline.c, is hardcopy of active dynamic allocated Render */
  67 /* only to be used here in this file, it's for speed */
  68 extern struct Render R;
  69 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
  70
  71 ListBase *get_lights(ShadeInput *shi)
  72 {
  73
  74         if (R.r.scemode & R_PREVIEWBUTS)
  75                 return &R.lights;
  76         if (shi->light_override)
  77                 return &shi->light_override->gobject;
  78         if (shi->mat && shi->mat->group)
  79                 return &shi->mat->group->gobject;
  80
  81         return &R.lights;
  82 }
  83
  84 #if 0
  85 static void fogcolor(const float colf[3], float *rco, float *view)
  86 {
  87         float alpha, stepsize, startdist, dist, hor[4], zen[3], vec[3], dview[3];
  88         float div=0.0f, distfac;
  89
  90         hor[0]= R.wrld.horr; hor[1]= R.wrld.horg; hor[2]= R.wrld.horb;
  91         zen[0]= R.wrld.zenr; zen[1]= R.wrld.zeng; zen[2]= R.wrld.zenb;
  92
  93         copy_v3_v3(vec, rco);
  94
  95         /* we loop from cur coord to mist start in steps */
  96         stepsize= 1.0f;
  97
  98         div= ABS(view[2]);
  99         dview[0]= view[0]/(stepsize*div);
 100         dview[1]= view[1]/(stepsize*div);
 101         dview[2]= -stepsize;
 102
 103         startdist= -rco[2] + BLI_frand();
 104         for (dist= startdist; dist>R.wrld.miststa; dist-= stepsize) {
 105
 106                 hor[0]= R.wrld.horr; hor[1]= R.wrld.horg; hor[2]= R.wrld.horb;
 107                 alpha= 1.0f;
 108                 do_sky_tex(vec, vec, NULL, hor, zen, &alpha);
 109
 110                 distfac= (dist-R.wrld.miststa)/R.wrld.mistdist;
 111
 112                 hor[3]= hor[0]*distfac*distfac;
 113
 114                 /* premul! */
 115                 alpha= hor[3];
 116                 hor[0]= hor[0]*alpha;
 117                 hor[1]= hor[1]*alpha;
 118                 hor[2]= hor[2]*alpha;
 119                 addAlphaOverFloat(colf, hor);
 120
 121                 sub_v3_v3(vec, dview);
 122         }
 123 }
 124 #endif
 125
 126 /* zcor is distance, co the 3d coordinate in eye space, return alpha */
 127 float mistfactor(float zcor, float const co[3])
 128 {
 129         float fac, hi;
 130
 131         fac = zcor - R.wrld.miststa;    /* zcor is calculated per pixel */
 132
 133         /* fac= -co[2]-R.wrld.miststa; */
 134
 135         if (fac > 0.0f) {
 136                 if (fac < R.wrld.mistdist) {
 137
 138                         fac = (fac / R.wrld.mistdist);
 139
 140                         if (R.wrld.mistype == 0) {
 141                                 fac *= fac;
 142                         }
 143                         else if (R.wrld.mistype == 1) {
 144                                 /* pass */
 145                         }
 146                         else {
 147                                 fac = sqrt(fac);
 148                         }
 149                 }
 150                 else {
 151                         fac = 1.0f;
 152                 }
 153         }
 154         else {
 155                 fac = 0.0f;
 156         }
 157
 158         /* height switched off mist */
 159         if (R.wrld.misthi!=0.0f && fac!=0.0f) {
 160                 /* at height misthi the mist is completely gone */
 161
 162                 hi = R.viewinv[0][2] * co[0] +
 163                      R.viewinv[1][2] * co[1] +
 164                      R.viewinv[2][2] * co[2] +
 165                      R.viewinv[3][2];
 166
 167                 if (hi > R.wrld.misthi) {
 168                         fac = 0.0f;
 169                 }
 170                 else if (hi>0.0f) {
 171                         hi= (R.wrld.misthi-hi)/R.wrld.misthi;
 172                         fac*= hi*hi;
 173                 }
 174         }
 175
 176         return (1.0f-fac)* (1.0f-R.wrld.misi);
 177 }
 178
 179 static void spothalo(struct LampRen *lar, ShadeInput *shi, float *intens)
 180 {
 181         double a, b, c, disc, nray[3], npos[3];
 182         double t0, t1 = 0.0f, t2= 0.0f, t3;
 183         float p1[3], p2[3], ladist, maxz = 0.0f, maxy = 0.0f, haint;
 184         int snijp, do_clip = TRUE, use_yco = FALSE;
 185
 186         *intens= 0.0f;
 187         haint= lar->haint;
 188
 189         if (R.r.mode & R_ORTHO) {
 190                 /* camera pos (view vector) cannot be used... */
 191                 /* camera position (cox,coy,0) rotate around lamp */
 192                 p1[0]= shi->co[0]-lar->co[0];
 193                 p1[1]= shi->co[1]-lar->co[1];
 194                 p1[2]= -lar->co[2];
 195                 mul_m3_v3(lar->imat, p1);
 196                 copy_v3db_v3fl(npos, p1);  /* npos is double! */
 197
 198                 /* pre-scale */
 199                 npos[2] *= (double)lar->sh_zfac;
 200         }
 201         else {
 202                 copy_v3db_v3fl(npos, lar->sh_invcampos);        /* in initlamp calculated */
 203         }
 204
 205         /* rotate view */
 206         copy_v3db_v3fl(nray, shi->view);
 207         mul_m3_v3_double(lar->imat, nray);
 208
 209         if (R.wrld.mode & WO_MIST) {
 210                 /* patchy... */
 211                 haint *= mistfactor(-lar->co[2], lar->co);
 212                 if (haint==0.0f) {
 213                         return;
 214                 }
 215         }
 216
 217
 218         /* rotate maxz */
 219         if (shi->co[2]==0.0f) {
 220                 do_clip = FALSE;  /* for when halo at sky */
 221         }
 222         else {
 223                 p1[0]= shi->co[0]-lar->co[0];
 224                 p1[1]= shi->co[1]-lar->co[1];
 225                 p1[2]= shi->co[2]-lar->co[2];
 226
 227                 maxz= lar->imat[0][2]*p1[0]+lar->imat[1][2]*p1[1]+lar->imat[2][2]*p1[2];
 228                 maxz*= lar->sh_zfac;
 229                 maxy= lar->imat[0][1]*p1[0]+lar->imat[1][1]*p1[1]+lar->imat[2][1]*p1[2];
 230
 231                 if (fabsf(nray[2]) < FLT_EPSILON) {
 232                         use_yco = TRUE;
 233                 }
 234         }
 235
 236         /* scale z to make sure volume is normalized */
 237         nray[2] *= (double)lar->sh_zfac;
 238         /* nray does not need normalization */
 239
 240         ladist= lar->sh_zfac*lar->dist;
 241
 242         /* solve */
 243         a = nray[0] * nray[0] + nray[1] * nray[1] - nray[2]*nray[2];
 244         b = nray[0] * npos[0] + nray[1] * npos[1] - nray[2]*npos[2];
 245         c = npos[0] * npos[0] + npos[1] * npos[1] - npos[2]*npos[2];
 246
 247         snijp= 0;
 248         if (fabs(a) < DBL_EPSILON) {
 249                 /*
 250                  * Only one intersection point...
 251                  */
 252                 return;
 253         }
 254         else {
 255                 disc = b*b - a*c;
 256
 257                 if (disc==0.0) {
 258                         t1=t2= (-b)/ a;
 259                         snijp= 2;
 260                 }
 261                 else if (disc > 0.0) {
 262                         disc = sqrt(disc);
 263                         t1 = (-b + disc) / a;
 264                         t2 = (-b - disc) / a;
 265                         snijp= 2;
 266                 }
 267         }
 268         if (snijp==2) {
 269                 int ok1=0, ok2=0;
 270
 271                 /* sort */
 272                 if (t1>t2) {
 273                         a= t1; t1= t2; t2= a;
 274                 }
 275
 276                 /* z of intersection points with diabolo */
 277                 p1[2]= npos[2] + t1*nray[2];
 278                 p2[2]= npos[2] + t2*nray[2];
 279
 280                 /* evaluate both points */
 281                 if (p1[2]<=0.0f) ok1= 1;
 282                 if (p2[2]<=0.0f && t1!=t2) ok2= 1;
 283
 284                 /* at least 1 point with negative z */
 285                 if (ok1==0 && ok2==0) return;
 286
 287                 /* intersction point with -ladist, the bottom of the cone */
 288                 if (use_yco == FALSE) {
 289                         t3= ((double)(-ladist)-npos[2])/nray[2];
 290
 291                         /* de we have to replace one of the intersection points? */
 292                         if (ok1) {
 293                                 if (p1[2]<-ladist) t1= t3;
 294                         }
 295                         else {
 296                                 t1= t3;
 297                         }
 298                         if (ok2) {
 299                                 if (p2[2]<-ladist) t2= t3;
 300                         }
 301                         else {
 302                                 t2= t3;
 303                         }
 304                 }
 305                 else if (ok1==0 || ok2==0) return;
 306
 307                 /* at least 1 visible interesction point */
 308                 if (t1<0.0 && t2<0.0) return;
 309
 310                 if (t1<0.0) t1= 0.0;
 311                 if (t2<0.0) t2= 0.0;
 312
 313                 if (t1==t2) return;
 314
 315                 /* sort again to be sure */
 316                 if (t1>t2) {
 317                         a= t1; t1= t2; t2= a;
 318                 }
 319
 320                 /* calculate t0: is the maximum visible z (when halo is intersected by face) */
 321                 if (do_clip) {
 322                         if (use_yco == FALSE) t0 = ((double)maxz - npos[2]) / nray[2];
 323                         else                  t0 = ((double)maxy - npos[1]) / nray[1];
 324
 325                         if (t0 < t1) return;
 326                         if (t0 < t2) t2= t0;
 327                 }
 328
 329                 /* calc points */
 330                 p1[0]= npos[0] + t1*nray[0];
 331                 p1[1]= npos[1] + t1*nray[1];
 332                 p1[2]= npos[2] + t1*nray[2];
 333                 p2[0]= npos[0] + t2*nray[0];
 334                 p2[1]= npos[1] + t2*nray[1];
 335                 p2[2]= npos[2] + t2*nray[2];
 336
 337
 338                 /* now we have 2 points, make three lengths with it */
 339
 340                 a= sqrt(p1[0]*p1[0]+p1[1]*p1[1]+p1[2]*p1[2]);
 341                 b= sqrt(p2[0]*p2[0]+p2[1]*p2[1]+p2[2]*p2[2]);
 342                 c= len_v3v3(p1, p2);
 343
 344                 a/= ladist;
 345                 a= sqrt(a);
 346                 b/= ladist;
 347                 b= sqrt(b);
 348                 c/= ladist;
 349
 350                 *intens= c*( (1.0-a)+(1.0-b) );
 351
 352                 /* WATCH IT: do not clip a,b en c at 1.0, this gives nasty little overflows
 353                  * at the edges (especially with narrow halos) */
 354                 if (*intens<=0.0f) return;
 355
 356                 /* soft area */
 357                 /* not needed because t0 has been used for p1/p2 as well */
 358                 /* if (doclip && t0<t2) { */
 359                 /*      *intens *= (t0-t1)/(t2-t1); */
 360                 /* } */
 361
 362                 *intens *= haint;
 363
 364                 if (lar->shb && lar->shb->shadhalostep) {
 365                         *intens *= shadow_halo(lar, p1, p2);
 366                 }
 367
 368         }
 369 }
 370
 371 void renderspothalo(ShadeInput *shi, float col[4], float alpha)
 372 {
 373         ListBase *lights;
 374         GroupObject *go;
 375         LampRen *lar;
 376         float i;
 377
 378         if (alpha==0.0f) return;
 379
 380         lights= get_lights(shi);
 381         for (go=lights->first; go; go= go->next) {
 382                 lar= go->lampren;
 383                 if (lar==NULL) continue;
 384
 385                 if (lar->type==LA_SPOT && (lar->mode & LA_HALO) && (lar->buftype != LA_SHADBUF_DEEP) && lar->haint>0) {
 386
 387                         if (lar->mode & LA_LAYER)
 388                                 if (shi->vlr && (lar->lay & shi->obi->lay)==0)
 389                                         continue;
 390                         if ((lar->lay & shi->lay)==0)
 391                                 continue;
 392
 393                         spothalo(lar, shi, &i);
 394                         if (i > 0.0f) {
 395                                 const float i_alpha = i * alpha;
 396                                 col[0] += i_alpha * lar->r;
 397                                 col[1] += i_alpha * lar->g;
 398                                 col[2] += i_alpha * lar->b;
 399                                 col[3] += i_alpha;  /* all premul */
 400                         }
 401                 }
 402         }
 403         /* clip alpha, is needed for unified 'alpha threshold' (vanillaRenderPipe.c) */
 404         if (col[3]>1.0f) col[3]= 1.0f;
 405 }
 406
 407
 408
 409 /* ---------------- shaders ----------------------- */
 410
 411 static double Normalize_d(double *n)
 412 {
 413         double d;
 414
 415         d= n[0]*n[0]+n[1]*n[1]+n[2]*n[2];
 416
 417         if (d>0.00000000000000001) {
 418                 d= sqrt(d);
 419
 420                 n[0]/=d;
 421                 n[1]/=d;
 422                 n[2]/=d;
 423         }
 424         else {
 425                 n[0]=n[1]=n[2]= 0.0;
 426                 d= 0.0;
 427         }
 428         return d;
 429 }
 430
 431 /* mix of 'real' fresnel and allowing control. grad defines blending gradient */
 432 float fresnel_fac(const float view[3], const float vn[3], float grad, float fac)
 433 {
 434         float t1, t2;
 435
 436         if (fac==0.0f) return 1.0f;
 437
 438         t1 = dot_v3v3(view, vn);
 439         if (t1>0.0f)  t2= 1.0f+t1;
 440         else t2= 1.0f-t1;
 441
 442         t2= grad + (1.0f-grad)*powf(t2, fac);
 443
 444         if (t2<0.0f) return 0.0f;
 445         else if (t2>1.0f) return 1.0f;
 446         return t2;
 447 }
 448
 449 static double saacos_d(double fac)
 450 {
 451         if (fac<= -1.0) return M_PI;
 452         else if (fac>=1.0) return 0.0;
 453         else return acos(fac);
 454 }
 455
 456 /* Stoke's form factor. Need doubles here for extreme small area sizes */
 457 static float area_lamp_energy(float (*area)[3], const float co[3], const float vn[3])
 458 {
 459         double fac;
 460         double vec[4][3];       /* vectors of rendered co to vertices lamp */
 461         double cross[4][3];     /* cross products of this */
 462         double rad[4];          /* angles between vecs */
 463
 464         VECSUB(vec[0], co, area[0]);
 465         VECSUB(vec[1], co, area[1]);
 466         VECSUB(vec[2], co, area[2]);
 467         VECSUB(vec[3], co, area[3]);
 468
 469         Normalize_d(vec[0]);
 470         Normalize_d(vec[1]);
 471         Normalize_d(vec[2]);
 472         Normalize_d(vec[3]);
 473
 474         /* cross product */
 475 #define CROSS(dest, a, b) \
 476         { \
 477                 dest[0]= a[1] * b[2] - a[2] * b[1]; \
 478                 dest[1]= a[2] * b[0] - a[0] * b[2]; \
 479                 dest[2]= a[0] * b[1] - a[1] * b[0]; \
 480         } (void)0
 481
 482         CROSS(cross[0], vec[0], vec[1]);
 483         CROSS(cross[1], vec[1], vec[2]);
 484         CROSS(cross[2], vec[2], vec[3]);
 485         CROSS(cross[3], vec[3], vec[0]);
 486
 487 #undef CROSS
 488
 489         Normalize_d(cross[0]);
 490         Normalize_d(cross[1]);
 491         Normalize_d(cross[2]);
 492         Normalize_d(cross[3]);
 493
 494         /* angles */
 495         rad[0]= vec[0][0]*vec[1][0]+ vec[0][1]*vec[1][1]+ vec[0][2]*vec[1][2];
 496         rad[1]= vec[1][0]*vec[2][0]+ vec[1][1]*vec[2][1]+ vec[1][2]*vec[2][2];
 497         rad[2]= vec[2][0]*vec[3][0]+ vec[2][1]*vec[3][1]+ vec[2][2]*vec[3][2];
 498         rad[3]= vec[3][0]*vec[0][0]+ vec[3][1]*vec[0][1]+ vec[3][2]*vec[0][2];
 499
 500         rad[0]= saacos_d(rad[0]);
 501         rad[1]= saacos_d(rad[1]);
 502         rad[2]= saacos_d(rad[2]);
 503         rad[3]= saacos_d(rad[3]);
 504
 505         /* Stoke formula */
 506         fac=  rad[0]*(vn[0]*cross[0][0]+ vn[1]*cross[0][1]+ vn[2]*cross[0][2]);
 507         fac+= rad[1]*(vn[0]*cross[1][0]+ vn[1]*cross[1][1]+ vn[2]*cross[1][2]);
 508         fac+= rad[2]*(vn[0]*cross[2][0]+ vn[1]*cross[2][1]+ vn[2]*cross[2][2]);
 509         fac+= rad[3]*(vn[0]*cross[3][0]+ vn[1]*cross[3][1]+ vn[2]*cross[3][2]);
 510
 511         if (fac<=0.0) return 0.0;
 512         return fac;
 513 }
 514
 515 static float area_lamp_energy_multisample(LampRen *lar, const float co[3], float *vn)
 516 {
 517         /* corner vectors are moved around according lamp jitter */
 518         float *jitlamp= lar->jitter, vec[3];
 519         float area[4][3], intens= 0.0f;
 520         int a= lar->ray_totsamp;
 521
 522         /* test if co is behind lamp */
 523         sub_v3_v3v3(vec, co, lar->co);
 524         if (dot_v3v3(vec, lar->vec) < 0.0f)
 525                 return 0.0f;
 526
 527         while (a--) {
 528                 vec[0]= jitlamp[0];
 529                 vec[1]= jitlamp[1];
 530                 vec[2]= 0.0f;
 531                 mul_m3_v3(lar->mat, vec);
 532
 533                 add_v3_v3v3(area[0], lar->area[0], vec);
 534                 add_v3_v3v3(area[1], lar->area[1], vec);
 535                 add_v3_v3v3(area[2], lar->area[2], vec);
 536                 add_v3_v3v3(area[3], lar->area[3], vec);
 537
 538                 intens+= area_lamp_energy(area, co, vn);
 539
 540                 jitlamp+= 2;
 541         }
 542         intens /= (float)lar->ray_totsamp;
 543
 544         return pow(intens * lar->areasize, lar->k);     /* corrected for buttons size and lar->dist^2 */
 545 }
 546
 547 static float spec(float inp, int hard)
 548 {
 549         float b1;
 550
 551         if (inp>=1.0f) return 1.0f;
 552         else if (inp<=0.0f) return 0.0f;
 553
 554         b1= inp*inp;
 555         /* avoid FPE */
 556         if (b1<0.01f) b1= 0.01f;
 557
 558         if ((hard & 1)==0)  inp= 1.0f;
 559         if (hard & 2)  inp*= b1;
 560         b1*= b1;
 561         if (hard & 4)  inp*= b1;
 562         b1*= b1;
 563         if (hard & 8)  inp*= b1;
 564         b1*= b1;
 565         if (hard & 16) inp*= b1;
 566         b1*= b1;
 567
 568         /* avoid FPE */
 569         if (b1<0.001f) b1= 0.0f;
 570
 571         if (hard & 32) inp*= b1;
 572         b1*= b1;
 573         if (hard & 64) inp*=b1;
 574         b1*= b1;
 575         if (hard & 128) inp*=b1;
 576
 577         if (b1<0.001f) b1= 0.0f;
 578
 579         if (hard & 256) {
 580                 b1*= b1;
 581                 inp*=b1;
 582         }
 583
 584         return inp;
 585 }
 586
 587 static float Phong_Spec(const float n[3], const float l[3], const float v[3], int hard, int tangent )
 588 {
 589         float h[3];
 590         float rslt;
 591
 592         h[0] = l[0] + v[0];
 593         h[1] = l[1] + v[1];
 594         h[2] = l[2] + v[2];
 595         normalize_v3(h);
 596
 597         rslt = h[0]*n[0] + h[1]*n[1] + h[2]*n[2];
 598         if (tangent) rslt= sasqrt(1.0f - rslt*rslt);
 599
 600         if ( rslt > 0.0f ) rslt= spec(rslt, hard);
 601         else rslt = 0.0f;
 602
 603         return rslt;
 604 }
 605
 606
 607 /* reduced cook torrance spec (for off-specular peak) */
 608 static float CookTorr_Spec(const float n[3], const float l[3], const float v[3], int hard, int tangent)
 609 {
 610         float i, nh, nv, h[3];
 611
 612         h[0]= v[0]+l[0];
 613         h[1]= v[1]+l[1];
 614         h[2]= v[2]+l[2];
 615         normalize_v3(h);
 616
 617         nh= n[0]*h[0]+n[1]*h[1]+n[2]*h[2];
 618         if (tangent) nh= sasqrt(1.0f - nh*nh);
 619         else if (nh<0.0f) return 0.0f;
 620
 621         nv= n[0]*v[0]+n[1]*v[1]+n[2]*v[2];
 622         if (tangent) nv= sasqrt(1.0f - nv*nv);
 623         else if (nv<0.0f) nv= 0.0f;
 624
 625         i= spec(nh, hard);
 626
 627         i= i/(0.1f+nv);
 628         return i;
 629 }
 630
 631 /* Blinn spec */
 632 static float Blinn_Spec(const float n[3], const float l[3], const float v[3], float refrac, float spec_power, int tangent)
 633 {
 634         float i, nh, nv, nl, vh, h[3];
 635         float a, b, c, g=0.0f, p, f, ang;
 636
 637         if (refrac < 1.0f) return 0.0f;
 638         if (spec_power == 0.0f) return 0.0f;
 639
 640         /* conversion from 'hardness' (1-255) to 'spec_power' (50 maps at 0.1) */
 641         if (spec_power<100.0f)
 642                 spec_power= sqrt(1.0f/spec_power);
 643         else spec_power= 10.0f/spec_power;
 644
 645         h[0]= v[0]+l[0];
 646         h[1]= v[1]+l[1];
 647         h[2]= v[2]+l[2];
 648         normalize_v3(h);
 649
 650         nh= n[0]*h[0]+n[1]*h[1]+n[2]*h[2]; /* Dot product between surface normal and half-way vector */
 651         if (tangent) nh= sasqrt(1.0f - nh*nh);
 652         else if (nh<0.0f) return 0.0f;
 653
 654         nv= n[0]*v[0]+n[1]*v[1]+n[2]*v[2]; /* Dot product between surface normal and view vector */
 655         if (tangent) nv= sasqrt(1.0f - nv*nv);
 656         if (nv<=0.01f) nv= 0.01f;                               /* hrms... */
 657
 658         nl= n[0]*l[0]+n[1]*l[1]+n[2]*l[2]; /* Dot product between surface normal and light vector */
 659         if (tangent) nl= sasqrt(1.0f - nl*nl);
 660         if (nl<=0.01f) {
 661                 return 0.0f;
 662         }
 663
 664         vh= v[0]*h[0]+v[1]*h[1]+v[2]*h[2]; /* Dot product between view vector and half-way vector */
 665         if (vh<=0.0f) vh= 0.01f;
 666
 667         a = 1.0f;
 668         b = (2.0f*nh*nv)/vh;
 669         c = (2.0f*nh*nl)/vh;
 670
 671         if ( a < b && a < c ) g = a;
 672         else if ( b < a && b < c ) g = b;
 673         else if ( c < a && c < b ) g = c;
 674
 675         p = sqrt((double)((refrac * refrac)+(vh * vh) - 1.0f));
 676         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))));
 677         ang = saacos(nh);
 678
 679         i= f * g * exp((double)(-(ang*ang) / (2.0f*spec_power*spec_power)));
 680         if (i<0.0f) i= 0.0f;
 681
 682         return i;
 683 }
 684
 685 /* cartoon render spec */
 686 static float Toon_Spec(const float n[3], const float l[3], const float v[3], float size, float smooth, int tangent)
 687 {
 688         float h[3];
 689         float ang;
 690         float rslt;
 691
 692         h[0] = l[0] + v[0];
 693         h[1] = l[1] + v[1];
 694         h[2] = l[2] + v[2];
 695         normalize_v3(h);
 696
 697         rslt = h[0]*n[0] + h[1]*n[1] + h[2]*n[2];
 698         if (tangent) rslt = sasqrt(1.0f - rslt*rslt);
 699
 700         ang = saacos( rslt );
 701
 702         if ( ang < size ) rslt = 1.0f;
 703         else if ( ang >= (size + smooth) || smooth == 0.0f ) rslt = 0.0f;
 704         else rslt = 1.0f - ((ang - size) / smooth);
 705
 706         return rslt;
 707 }
 708
 709 /* Ward isotropic gaussian spec */
 710 static float WardIso_Spec(const float n[3], const float l[3], const float v[3], float rms, int tangent)
 711 {
 712         float i, nh, nv, nl, h[3], angle, alpha;
 713
 714
 715         /* half-way vector */
 716         h[0] = l[0] + v[0];
 717         h[1] = l[1] + v[1];
 718         h[2] = l[2] + v[2];
 719         normalize_v3(h);
 720
 721         nh = n[0]*h[0]+n[1]*h[1]+n[2]*h[2]; /* Dot product between surface normal and half-way vector */
 722         if (tangent) nh = sasqrt(1.0f - nh*nh);
 723         if (nh<=0.0f) nh = 0.001f;
 724
 725         nv = n[0]*v[0]+n[1]*v[1]+n[2]*v[2]; /* Dot product between surface normal and view vector */
 726         if (tangent) nv = sasqrt(1.0f - nv*nv);
 727         if (nv<=0.0f) nv = 0.001f;
 728
 729         nl = n[0]*l[0]+n[1]*l[1]+n[2]*l[2]; /* Dot product between surface normal and light vector */
 730         if (tangent) nl = sasqrt(1.0f - nl*nl);
 731         if (nl<=0.0f) nl = 0.001f;
 732
 733         angle = tan(saacos(nh));
 734         alpha = MAX2(rms, 0.001f);
 735
 736         i= nl * (1.0f/(4.0f*(float)M_PI*alpha*alpha)) * (expf( -(angle*angle)/(alpha*alpha))/(sqrtf(nv*nl)));
 737
 738         return i;
 739 }
 740
 741 /* cartoon render diffuse */
 742 static float Toon_Diff(const float n[3], const float l[3], const float UNUSED(v[3]), float size, float smooth)
 743 {
 744         float rslt, ang;
 745
 746         rslt = n[0]*l[0] + n[1]*l[1] + n[2]*l[2];
 747
 748         ang = saacos( (double)(rslt) );
 749
 750         if ( ang < size ) rslt = 1.0f;
 751         else if ( ang >= (size + smooth) || smooth == 0.0f ) rslt = 0.0f;
 752         else rslt = 1.0f - ((ang - size) / smooth);
 753
 754         return rslt;
 755 }
 756
 757 /* Oren Nayar diffuse */
 758
 759 /* 'nl' is either dot product, or return value of area light */
 760 /* in latter case, only last multiplication uses 'nl' */
 761 static float OrenNayar_Diff(float nl, const float n[3], const float l[3], const float v[3], float rough )
 762 {
 763         float i/*, nh*/, nv /*, vh */, realnl, h[3];
 764         float a, b, t, A, B;
 765         float Lit_A, View_A, Lit_B[3], View_B[3];
 766
 767         h[0]= v[0]+l[0];
 768         h[1]= v[1]+l[1];
 769         h[2]= v[2]+l[2];
 770         normalize_v3(h);
 771
 772         /* nh= n[0]*h[0]+n[1]*h[1]+n[2]*h[2]; */ /* Dot product between surface normal and half-way vector */
 773         /* if (nh<0.0f) nh = 0.0f; */
 774
 775         nv= n[0]*v[0]+n[1]*v[1]+n[2]*v[2]; /* Dot product between surface normal and view vector */
 776         if (nv<=0.0f) nv= 0.0f;
 777
 778         realnl= n[0]*l[0]+n[1]*l[1]+n[2]*l[2]; /* Dot product between surface normal and light vector */
 779         if (realnl<=0.0f) return 0.0f;
 780         if (nl<0.0f) return 0.0f;               /* value from area light */
 781
 782         /* vh= v[0]*h[0]+v[1]*h[1]+v[2]*h[2]; */ /* Dot product between view vector and halfway vector */
 783         /* if (vh<=0.0f) vh= 0.0f; */
 784
 785         Lit_A = saacos(realnl);
 786         View_A = saacos( nv );
 787
 788         Lit_B[0] = l[0] - (realnl * n[0]);
 789         Lit_B[1] = l[1] - (realnl * n[1]);
 790         Lit_B[2] = l[2] - (realnl * n[2]);
 791         normalize_v3(Lit_B);
 792
 793         View_B[0] = v[0] - (nv * n[0]);
 794         View_B[1] = v[1] - (nv * n[1]);
 795         View_B[2] = v[2] - (nv * n[2]);
 796         normalize_v3(View_B);
 797
 798         t = Lit_B[0]*View_B[0] + Lit_B[1]*View_B[1] + Lit_B[2]*View_B[2];
 799         if ( t < 0 ) t = 0;
 800
 801         if ( Lit_A > View_A ) {
 802                 a = Lit_A;
 803                 b = View_A;
 804         }
 805         else {
 806                 a = View_A;
 807                 b = Lit_A;
 808         }
 809
 810         A = 1.0f - (0.5f * ((rough * rough) / ((rough * rough) + 0.33f)));
 811         B = 0.45f * ((rough * rough) / ((rough * rough) + 0.09f));
 812
 813         b*= 0.95f;      /* prevent tangens from shooting to inf, 'nl' can be not a dot product here. */
 814                                 /* overflow only happens with extreme size area light, and higher roughness */
 815         i = nl * ( A + ( B * t * sinf(a) * tanf(b) ) );
 816
 817         return i;
 818 }
 819
 820 /* Minnaert diffuse */
 821 static float Minnaert_Diff(float nl, const float n[3], const float v[3], float darkness)
 822 {
 823         float i, nv;
 824
 825         /* nl = dot product between surface normal and light vector */
 826         if (nl <= 0.0f)
 827                 return 0.0f;
 828
 829         /* nv = dot product between surface normal and view vector */
 830         nv = dot_v3v3(n, v);
 831         if (nv < 0.0f)
 832                 nv = 0.0f;
 833
 834         if (darkness <= 1.0f)
 835                 i = nl * pow(max_ff(nv * nl, 0.1f), (darkness - 1.0f) ); /*The Real model*/
 836         else
 837                 i = nl * pow( (1.001f - nv), (darkness  - 1.0f) ); /*Nvidia model*/
 838
 839         return i;
 840 }
 841
 842 static float Fresnel_Diff(float *vn, float *lv, float *UNUSED(view), float fac_i, float fac)
 843 {
 844         return fresnel_fac(lv, vn, fac_i, fac);
 845 }
 846
 847 /* --------------------------------------------- */
 848 /* also called from texture.c */
 849 void calc_R_ref(ShadeInput *shi)
 850 {
 851         float i;
 852
 853         /* shi->vn dot shi->view */
 854         i= -2*(shi->vn[0]*shi->view[0]+shi->vn[1]*shi->view[1]+shi->vn[2]*shi->view[2]);
 855
 856         shi->ref[0]= (shi->view[0]+i*shi->vn[0]);
 857         shi->ref[1]= (shi->view[1]+i*shi->vn[1]);
 858         shi->ref[2]= (shi->view[2]+i*shi->vn[2]);
 859         if (shi->osatex) {
 860                 if (shi->vlr->flag & R_SMOOTH) {
 861                         i= -2*( (shi->vn[0]+shi->dxno[0])*(shi->view[0]+shi->dxview) +
 862                                 (shi->vn[1]+shi->dxno[1])*shi->view[1]+ (shi->vn[2]+shi->dxno[2])*shi->view[2] );
 863
 864                         shi->dxref[0]= shi->ref[0]- ( shi->view[0]+shi->dxview+i*(shi->vn[0]+shi->dxno[0]));
 865                         shi->dxref[1]= shi->ref[1]- (shi->view[1]+ i*(shi->vn[1]+shi->dxno[1]));
 866                         shi->dxref[2]= shi->ref[2]- (shi->view[2]+ i*(shi->vn[2]+shi->dxno[2]));
 867
 868                         i= -2*( (shi->vn[0]+shi->dyno[0])*shi->view[0]+
 869                                 (shi->vn[1]+shi->dyno[1])*(shi->view[1]+shi->dyview)+ (shi->vn[2]+shi->dyno[2])*shi->view[2] );
 870
 871                         shi->dyref[0]= shi->ref[0]- (shi->view[0]+ i*(shi->vn[0]+shi->dyno[0]));
 872                         shi->dyref[1]= shi->ref[1]- (shi->view[1]+shi->dyview+i*(shi->vn[1]+shi->dyno[1]));
 873                         shi->dyref[2]= shi->ref[2]- (shi->view[2]+ i*(shi->vn[2]+shi->dyno[2]));
 874
 875                 }
 876                 else {
 877
 878                         i= -2*( shi->vn[0]*(shi->view[0]+shi->dxview) +
 879                                 shi->vn[1]*shi->view[1]+ shi->vn[2]*shi->view[2] );
 880
 881                         shi->dxref[0]= shi->ref[0]- (shi->view[0]+shi->dxview+i*shi->vn[0]);
 882                         shi->dxref[1]= shi->ref[1]- (shi->view[1]+ i*shi->vn[1]);
 883                         shi->dxref[2]= shi->ref[2]- (shi->view[2]+ i*shi->vn[2]);
 884
 885                         i= -2*( shi->vn[0]*shi->view[0]+
 886                                 shi->vn[1]*(shi->view[1]+shi->dyview)+ shi->vn[2]*shi->view[2] );
 887
 888                         shi->dyref[0]= shi->ref[0]- (shi->view[0]+ i*shi->vn[0]);
 889                         shi->dyref[1]= shi->ref[1]- (shi->view[1]+shi->dyview+i*shi->vn[1]);
 890                         shi->dyref[2]= shi->ref[2]- (shi->view[2]+ i*shi->vn[2]);
 891                 }
 892         }
 893
 894 }
 895
 896 /* called from ray.c */
 897 void shade_color(ShadeInput *shi, ShadeResult *shr)
 898 {
 899         Material *ma= shi->mat;
 900
 901         if (ma->mode & (MA_FACETEXTURE)) {
 902                 shi->r= shi->vcol[0];
 903                 shi->g= shi->vcol[1];
 904                 shi->b= shi->vcol[2];
 905                 if (ma->mode & (MA_FACETEXTURE_ALPHA))
 906                         shi->alpha= shi->vcol[3];
 907         }
 908         else if (ma->mode & (MA_VERTEXCOLP)) {
 909                 float neg_alpha = 1.0f - shi->vcol[3];
 910                 shi->r= shi->r*neg_alpha + shi->vcol[0]*shi->vcol[3];
 911                 shi->g= shi->g*neg_alpha + shi->vcol[1]*shi->vcol[3];
 912                 shi->b= shi->b*neg_alpha + shi->vcol[2]*shi->vcol[3];
 913         }
 914
 915         if (ma->texco)
 916                 do_material_tex(shi, &R);
 917
 918         if (ma->fresnel_tra!=0.0f)
 919                 shi->alpha*= fresnel_fac(shi->view, shi->vn, ma->fresnel_tra_i, ma->fresnel_tra);
 920
 921         if (!(shi->mode & MA_TRANSP)) shi->alpha= 1.0f;
 922
 923         shr->diff[0]= shi->r;
 924         shr->diff[1]= shi->g;
 925         shr->diff[2]= shi->b;
 926         shr->alpha= shi->alpha;
 927 }
 928
 929 /* ramp for at end of shade */
 930 static void ramp_diffuse_result(float *diff, ShadeInput *shi)
 931 {
 932         Material *ma= shi->mat;
 933         float col[4];
 934
 935         if (ma->ramp_col) {
 936                 if (ma->rampin_col==MA_RAMP_IN_RESULT) {
 937                         float fac = rgb_to_grayscale(diff);
 938                         do_colorband(ma->ramp_col, fac, col);
 939
 940                         /* blending method */
 941                         fac= col[3]*ma->rampfac_col;
 942
 943                         ramp_blend(ma->rampblend_col, diff, fac, col);
 944                 }
 945         }
 946 }
 947
 948 /* r,g,b denote energy, ramp is used with different values to make new material color */
 949 static void add_to_diffuse(float *diff, ShadeInput *shi, float is, float r, float g, float b)
 950 {
 951         Material *ma= shi->mat;
 952
 953         if (ma->ramp_col && (ma->mode & MA_RAMP_COL)) {
 954
 955                 /* MA_RAMP_IN_RESULT is exceptional */
 956                 if (ma->rampin_col==MA_RAMP_IN_RESULT) {
 957                         /* normal add */
 958                         diff[0] += r * shi->r;
 959                         diff[1] += g * shi->g;
 960                         diff[2] += b * shi->b;
 961                 }
 962                 else {
 963                         float colt[3], col[4];
 964                         float fac;
 965
 966                         /* input */
 967                         switch (ma->rampin_col) {
 968                         case MA_RAMP_IN_ENERGY:
 969                                 /* should use 'rgb_to_grayscale' but we only have a vector version */
 970                                 fac= 0.3f*r + 0.58f*g + 0.12f*b;
 971                                 break;
 972                         case MA_RAMP_IN_SHADER:
 973                                 fac= is;
 974                                 break;
 975                         case MA_RAMP_IN_NOR:
 976                                 fac= shi->view[0]*shi->vn[0] + shi->view[1]*shi->vn[1] + shi->view[2]*shi->vn[2];
 977                                 break;
 978                         default:
 979                                 fac= 0.0f;
 980                                 break;
 981                         }
 982
 983                         do_colorband(ma->ramp_col, fac, col);
 984
 985                         /* blending method */
 986                         fac= col[3]*ma->rampfac_col;
 987                         colt[0]= shi->r;
 988                         colt[1]= shi->g;
 989                         colt[2]= shi->b;
 990
 991                         ramp_blend(ma->rampblend_col, colt, fac, col);
 992
 993                         /* output to */
 994                         diff[0] += r * colt[0];
 995                         diff[1] += g * colt[1];
 996                         diff[2] += b * colt[2];
 997                 }
 998         }
 999         else {
1000                 diff[0] += r * shi->r;
1001                 diff[1] += g * shi->g;
1002                 diff[2] += b * shi->b;
1003         }
1004 }
1005
1006 static void ramp_spec_result(float spec_col[3], ShadeInput *shi)
1007 {
1008         Material *ma= shi->mat;
1009
1010         if (ma->ramp_spec && (ma->rampin_spec==MA_RAMP_IN_RESULT)) {
1011                 float col[4];
1012                 float fac = rgb_to_grayscale(spec_col);
1013
1014                 do_colorband(ma->ramp_spec, fac, col);
1015
1016                 /* blending method */
1017                 fac= col[3]*ma->rampfac_spec;
1018
1019                 ramp_blend(ma->rampblend_spec, spec_col, fac, col);
1020
1021         }
1022 }
1023
1024 /* is = dot product shade, t = spec energy */
1025 static void do_specular_ramp(ShadeInput *shi, float is, float t, float spec[3])
1026 {
1027         Material *ma= shi->mat;
1028
1029         spec[0]= shi->specr;
1030         spec[1]= shi->specg;
1031         spec[2]= shi->specb;
1032
1033         /* MA_RAMP_IN_RESULT is exception */
1034         if (ma->ramp_spec && (ma->rampin_spec!=MA_RAMP_IN_RESULT)) {
1035                 float fac;
1036                 float col[4];
1037
1038                 /* input */
1039                 switch (ma->rampin_spec) {
1040                 case MA_RAMP_IN_ENERGY:
1041                         fac= t;
1042                         break;
1043                 case MA_RAMP_IN_SHADER:
1044                         fac= is;
1045                         break;
1046                 case MA_RAMP_IN_NOR:
1047                         fac= shi->view[0]*shi->vn[0] + shi->view[1]*shi->vn[1] + shi->view[2]*shi->vn[2];
1048                         break;
1049                 default:
1050                         fac= 0.0f;
1051                         break;
1052                 }
1053
1054                 do_colorband(ma->ramp_spec, fac, col);
1055
1056                 /* blending method */
1057                 fac= col[3]*ma->rampfac_spec;
1058
1059                 ramp_blend(ma->rampblend_spec, spec, fac, col);
1060         }
1061 }
1062
1063 /* pure AO, check for raytrace and world should have been done */
1064 /* preprocess, textures were not done, don't use shi->amb for that reason */
1065 void ambient_occlusion(ShadeInput *shi)
1066 {
1067         if ((R.wrld.ao_gather_method == WO_AOGATHER_APPROX) && shi->mat->amb!=0.0f) {
1068                 sample_occ(&R, shi);
1069         }
1070         else if ((R.r.mode & R_RAYTRACE) && shi->mat->amb!=0.0f) {
1071                 ray_ao(shi, shi->ao, shi->env);
1072         }
1073         else {
1074                 shi->ao[0]= shi->ao[1]= shi->ao[2]= 1.0f;
1075                 zero_v3(shi->env);
1076                 zero_v3(shi->indirect);
1077         }
1078 }
1079
1080
1081 /* wrld mode was checked for */
1082 static void ambient_occlusion_apply(ShadeInput *shi, ShadeResult *shr)
1083 {
1084         float f= R.wrld.aoenergy;
1085         float tmp[3], tmpspec[3];
1086
1087         if (!((R.r.mode & R_RAYTRACE) || R.wrld.ao_gather_method == WO_AOGATHER_APPROX))
1088                 return;
1089         if (f == 0.0f)
1090                 return;
1091
1092         if (R.wrld.aomix==WO_AOADD) {
1093                 shr->combined[0] += shi->ao[0]*shi->r*shi->refl*f;
1094                 shr->combined[1] += shi->ao[1]*shi->g*shi->refl*f;
1095                 shr->combined[2] += shi->ao[2]*shi->b*shi->refl*f;
1096         }
1097         else if (R.wrld.aomix==WO_AOMUL) {
1098                 mul_v3_v3v3(tmp, shr->combined, shi->ao);
1099                 mul_v3_v3v3(tmpspec, shr->spec, shi->ao);
1100
1101                 if (f == 1.0f) {
1102                         copy_v3_v3(shr->combined, tmp);
1103                         copy_v3_v3(shr->spec, tmpspec);
1104                 }
1105                 else {
1106                         interp_v3_v3v3(shr->combined, shr->combined, tmp, f);
1107                         interp_v3_v3v3(shr->spec, shr->spec, tmpspec, f);
1108                 }
1109         }
1110 }
1111
1112 void environment_lighting_apply(ShadeInput *shi, ShadeResult *shr)
1113 {
1114         float f= R.wrld.ao_env_energy*shi->amb;
1115
1116         if (!((R.r.mode & R_RAYTRACE) || R.wrld.ao_gather_method == WO_AOGATHER_APPROX))
1117                 return;
1118         if (f == 0.0f)
1119                 return;
1120
1121         shr->combined[0] += shi->env[0]*shi->r*shi->refl*f;
1122         shr->combined[1] += shi->env[1]*shi->g*shi->refl*f;
1123         shr->combined[2] += shi->env[2]*shi->b*shi->refl*f;
1124 }
1125
1126 static void indirect_lighting_apply(ShadeInput *shi, ShadeResult *shr)
1127 {
1128         float f= R.wrld.ao_indirect_energy;
1129
1130         if (!((R.r.mode & R_RAYTRACE) || R.wrld.ao_gather_method == WO_AOGATHER_APPROX))
1131                 return;
1132         if (f == 0.0f)
1133                 return;
1134
1135         shr->combined[0] += shi->indirect[0]*shi->r*shi->refl*f;
1136         shr->combined[1] += shi->indirect[1]*shi->g*shi->refl*f;
1137         shr->combined[2] += shi->indirect[2]*shi->b*shi->refl*f;
1138 }
1139
1140 /* result written in shadfac */
1141 void lamp_get_shadow(LampRen *lar, ShadeInput *shi, float inp, float shadfac[4], int do_real)
1142 {
1143         LampShadowSubSample *lss= &(lar->shadsamp[shi->thread].s[shi->sample]);
1144
1145         if (do_real || lss->samplenr!=shi->samplenr) {
1146
1147                 shadfac[0]= shadfac[1]= shadfac[2]= shadfac[3]= 1.0f;
1148
1149                 if (lar->shb) {
1150                         if (lar->buftype==LA_SHADBUF_IRREGULAR)
1151                                 shadfac[3]= ISB_getshadow(shi, lar->shb);
1152                         else
1153                                 shadfac[3] = testshadowbuf(&R, lar->shb, shi->co, shi->dxco, shi->dyco, inp, shi->mat->lbias);
1154                 }
1155                 else if (lar->mode & LA_SHAD_RAY) {
1156                         ray_shadow(shi, lar, shadfac);
1157                 }
1158
1159                 if (shi->depth==0) {
1160                         copy_v4_v4(lss->shadfac, shadfac);
1161                         lss->samplenr= shi->samplenr;
1162                 }
1163         }
1164         else {
1165                 copy_v4_v4(shadfac, lss->shadfac);
1166         }
1167 }
1168
1169 /* lampdistance and spot angle, writes in lv and dist */
1170 float lamp_get_visibility(LampRen *lar, const float co[3], float lv[3], float *dist)
1171 {
1172         if (lar->type==LA_SUN || lar->type==LA_HEMI) {
1173                 *dist= 1.0f;
1174                 copy_v3_v3(lv, lar->vec);
1175                 return 1.0f;
1176         }
1177         else {
1178                 float visifac= 1.0f, t;
1179
1180                 sub_v3_v3v3(lv, co, lar->co);
1181                 *dist= sqrtf(dot_v3v3(lv, lv));
1182                 t= 1.0f/dist[0];
1183                 mul_v3_fl(lv, t);
1184
1185                 /* area type has no quad or sphere option */
1186                 if (lar->type==LA_AREA) {
1187                         /* area is single sided */
1188                         //if (dot_v3v3(lv, lar->vec) > 0.0f)
1189                         //      visifac= 1.0f;
1190                         //else
1191                         //      visifac= 0.0f;
1192                 }
1193                 else {
1194                         switch (lar->falloff_type) {
1195                                 case LA_FALLOFF_CONSTANT:
1196                                         visifac = 1.0f;
1197                                         break;
1198                                 case LA_FALLOFF_INVLINEAR:
1199                                         visifac = lar->dist/(lar->dist + dist[0]);
1200                                         break;
1201                                 case LA_FALLOFF_INVSQUARE:
1202                                         /* NOTE: This seems to be a hack since commit r12045 says this
1203                                          * option is similar to old Quad, but with slight changes.
1204                                          * Correct inv square would be (which would be old Quad):
1205                                          * visifac = lar->distkw / (lar->distkw + dist[0]*dist[0]);
1206                                          */
1207                                         visifac = lar->dist / (lar->dist + dist[0]*dist[0]);
1208                                         break;
1209                                 case LA_FALLOFF_SLIDERS:
1210                                         if (lar->ld1>0.0f)
1211                                                 visifac= lar->dist/(lar->dist+lar->ld1*dist[0]);
1212                                         if (lar->ld2>0.0f)
1213                                                 visifac*= lar->distkw/(lar->distkw+lar->ld2*dist[0]*dist[0]);
1214                                         break;
1215                                 case LA_FALLOFF_CURVE:
1216                                         /* curvemapping_initialize is called from #add_render_lamp */
1217                                         visifac = curvemapping_evaluateF(lar->curfalloff, 0, dist[0]/lar->dist);
1218                                         break;
1219                         }
1220
1221                         if (lar->mode & LA_SPHERE) {
1222                                 float t= lar->dist - dist[0];
1223                                 if (t<=0.0f)
1224                                         visifac= 0.0f;
1225                                 else
1226                                         visifac*= t/lar->dist;
1227                         }
1228
1229                         if (visifac > 0.0f) {
1230                                 if (lar->type==LA_SPOT) {
1231                                         float inpr;
1232
1233                                         if (lar->mode & LA_SQUARE) {
1234                                                 if (dot_v3v3(lv, lar->vec) > 0.0f) {
1235                                                         float lvrot[3], x;
1236
1237                                                         /* rotate view to lampspace */
1238                                                         copy_v3_v3(lvrot, lv);
1239                                                         mul_m3_v3(lar->imat, lvrot);
1240
1241                                                         x = max_ff(fabsf(lvrot[0]/lvrot[2]), fabsf(lvrot[1]/lvrot[2]));
1242                                                         /* 1.0f/(sqrt(1+x*x)) is equivalent to cos(atan(x)) */
1243
1244                                                         inpr= 1.0f/(sqrt(1.0f+x*x));
1245                                                 }
1246                                                 else inpr= 0.0f;
1247                                         }
1248                                         else {
1249                                                 inpr= lv[0]*lar->vec[0]+lv[1]*lar->vec[1]+lv[2]*lar->vec[2];
1250                                         }
1251
1252                                         t= lar->spotsi;
1253                                         if (inpr<=t)
1254                                                 visifac= 0.0f;
1255                                         else {
1256                                                 t= inpr-t;
1257                                                 if (t<lar->spotbl && lar->spotbl!=0.0f) {
1258                                                         /* soft area */
1259                                                         float i= t/lar->spotbl;
1260                                                         t= i*i;
1261                                                         inpr*= (3.0f*t-2.0f*t*i);
1262                                                 }
1263                                                 visifac*= inpr;
1264                                         }
1265                                 }
1266                         }
1267                 }
1268                 if (visifac <= 0.001f) visifac = 0.0f;
1269                 return visifac;
1270         }
1271 }
1272
1273 /* function returns raw diff, spec and full shadowed diff in the 'shad' pass */
1274 static void shade_one_light(LampRen *lar, ShadeInput *shi, ShadeResult *shr, int passflag)
1275 {
1276         Material *ma= shi->mat;
1277         VlakRen *vlr= shi->vlr;
1278         float lv[3], lampdist, lacol[3], shadfac[4], lashdw[3];
1279         float i, is, i_noshad, inp, *vn, *view, vnor[3], phongcorr=1.0f;
1280         float visifac;
1281
1282         vn= shi->vn;
1283         view= shi->view;
1284
1285
1286         if (lar->energy == 0.0f) return;
1287         /* only shadow lamps shouldn't affect shadow-less materials at all */
1288         if ((lar->mode & LA_ONLYSHADOW) && (!(ma->mode & MA_SHADOW) || !(R.r.mode & R_SHADOW)))
1289                 return;
1290         /* optimization, don't render fully black lamps */
1291         if (!(lar->mode & LA_TEXTURE) && (lar->r + lar->g + lar->b == 0.0f))
1292                 return;
1293
1294         /* lampdist, spot angle, area side, ... */
1295         visifac= lamp_get_visibility(lar, shi->co, lv, &lampdist);
1296         if (visifac==0.0f)
1297                 return;
1298
1299         if (lar->type==LA_SPOT) {
1300                 if (lar->mode & LA_OSATEX) {
1301                         shi->osatex= 1; /* signal for multitex() */
1302
1303                         shi->dxlv[0]= lv[0] - (shi->co[0]-lar->co[0]+shi->dxco[0])/lampdist;
1304                         shi->dxlv[1]= lv[1] - (shi->co[1]-lar->co[1]+shi->dxco[1])/lampdist;
1305                         shi->dxlv[2]= lv[2] - (shi->co[2]-lar->co[2]+shi->dxco[2])/lampdist;
1306
1307                         shi->dylv[0]= lv[0] - (shi->co[0]-lar->co[0]+shi->dyco[0])/lampdist;
1308                         shi->dylv[1]= lv[1] - (shi->co[1]-lar->co[1]+shi->dyco[1])/lampdist;
1309                         shi->dylv[2]= lv[2] - (shi->co[2]-lar->co[2]+shi->dyco[2])/lampdist;
1310                 }
1311         }
1312
1313         /* lamp color texture */
1314         lacol[0]= lar->r;
1315         lacol[1]= lar->g;
1316         lacol[2]= lar->b;
1317
1318         lashdw[0]= lar->shdwr;
1319         lashdw[1]= lar->shdwg;
1320         lashdw[2]= lar->shdwb;
1321
1322         if (lar->mode & LA_TEXTURE)     do_lamp_tex(lar, lv, shi, lacol, LA_TEXTURE);
1323         if (lar->mode & LA_SHAD_TEX)    do_lamp_tex(lar, lv, shi, lashdw, LA_SHAD_TEX);
1324
1325                 /* tangent case; calculate fake face normal, aligned with lampvector */
1326                 /* note, vnor==vn is used as tangent trigger for buffer shadow */
1327         if (vlr->flag & R_TANGENT) {
1328                 float cross[3], nstrand[3], blend;
1329
1330                 if (ma->mode & MA_STR_SURFDIFF) {
1331                         cross_v3_v3v3(cross, shi->surfnor, vn);
1332                         cross_v3_v3v3(nstrand, vn, cross);
1333
1334                         blend= dot_v3v3(nstrand, shi->surfnor);
1335                         blend= 1.0f - blend;
1336                         CLAMP(blend, 0.0f, 1.0f);
1337
1338                         interp_v3_v3v3(vnor, nstrand, shi->surfnor, blend);
1339                         normalize_v3(vnor);
1340                 }
1341                 else {
1342                         cross_v3_v3v3(cross, lv, vn);
1343                         cross_v3_v3v3(vnor, cross, vn);
1344                         normalize_v3(vnor);
1345                 }
1346
1347                 if (ma->strand_surfnor > 0.0f) {
1348                         if (ma->strand_surfnor > shi->surfdist) {
1349                                 blend= (ma->strand_surfnor - shi->surfdist)/ma->strand_surfnor;
1350                                 interp_v3_v3v3(vnor, vnor, shi->surfnor, blend);
1351                                 normalize_v3(vnor);
1352                         }
1353                 }
1354
1355                 vnor[0]= -vnor[0];vnor[1]= -vnor[1];vnor[2]= -vnor[2];
1356                 vn= vnor;
1357         }
1358         else if (ma->mode & MA_TANGENT_V) {
1359                 float cross[3];
1360                 cross_v3_v3v3(cross, lv, shi->tang);
1361                 cross_v3_v3v3(vnor, cross, shi->tang);
1362                 normalize_v3(vnor);
1363                 vnor[0]= -vnor[0];vnor[1]= -vnor[1];vnor[2]= -vnor[2];
1364                 vn= vnor;
1365         }
1366
1367         /* dot product and reflectivity */
1368         /* inp = dotproduct, is = shader result, i = lamp energy (with shadow), i_noshad = i without shadow */
1369         inp= dot_v3v3(vn, lv);
1370
1371         /* phong threshold to prevent backfacing faces having artifacts on ray shadow (terminator problem) */
1372         /* this complex construction screams for a nicer implementation! (ton) */
1373         if (R.r.mode & R_SHADOW) {
1374                 if (ma->mode & MA_SHADOW) {
1375                         if (lar->type == LA_HEMI || lar->type == LA_AREA) {
1376                                 /* pass */
1377                         }
1378                         else if ((ma->mode & MA_RAYBIAS) && (lar->mode & LA_SHAD_RAY) && (vlr->flag & R_SMOOTH)) {
1379                                 float thresh= shi->obr->ob->smoothresh;
1380                                 if (inp>thresh)
1381                                         phongcorr= (inp-thresh)/(inp*(1.0f-thresh));
1382                                 else
1383                                         phongcorr= 0.0f;
1384                         }
1385                         else if (ma->sbias!=0.0f && ((lar->mode & LA_SHAD_RAY) || lar->shb)) {
1386                                 if (inp>ma->sbias)
1387                                         phongcorr= (inp-ma->sbias)/(inp*(1.0f-ma->sbias));
1388                                 else
1389                                         phongcorr= 0.0f;
1390                         }
1391                 }
1392         }
1393
1394         /* diffuse shaders */
1395         if (lar->mode & LA_NO_DIFF) {
1396                 is = 0.0f;  /* skip shaders */
1397         }
1398         else if (lar->type==LA_HEMI) {
1399                 is = 0.5f * inp + 0.5f;
1400         }
1401         else {
1402
1403                 if (lar->type==LA_AREA)
1404                         inp= area_lamp_energy_multisample(lar, shi->co, vn);
1405
1406                 /* diffuse shaders (oren nayer gets inp from area light) */
1407                 if (ma->diff_shader==MA_DIFF_ORENNAYAR) is= OrenNayar_Diff(inp, vn, lv, view, ma->roughness);
1408                 else if (ma->diff_shader==MA_DIFF_TOON) is= Toon_Diff(vn, lv, view, ma->param[0], ma->param[1]);
1409                 else if (ma->diff_shader==MA_DIFF_MINNAERT) is= Minnaert_Diff(inp, vn, view, ma->darkness);
1410                 else if (ma->diff_shader==MA_DIFF_FRESNEL) is= Fresnel_Diff(vn, lv, view, ma->param[0], ma->param[1]);
1411                 else is= inp;  /* Lambert */
1412         }
1413
1414         /* 'is' is diffuse */
1415         if ((ma->shade_flag & MA_CUBIC) && is > 0.0f && is < 1.0f) {
1416                 is= 3.0f * is * is - 2.0f * is * is * is;  /* nicer termination of shades */
1417         }
1418
1419         i= is*phongcorr;
1420
1421         if (i>0.0f) {
1422                 i*= visifac*shi->refl;
1423         }
1424         i_noshad= i;
1425
1426         vn = shi->vn;  /* bring back original vector, we use special specular shaders for tangent */
1427         if (ma->mode & MA_TANGENT_V)
1428                 vn= shi->tang;
1429
1430         /* init transp shadow */
1431         shadfac[0]= shadfac[1]= shadfac[2]= shadfac[3]= 1.0f;
1432
1433         /* shadow and spec, (visifac==0 outside spot) */
1434         if (visifac> 0.0f) {
1435
1436                 if ((R.r.mode & R_SHADOW)) {
1437                         if (ma->mode & MA_SHADOW) {
1438                                 if (lar->shb || (lar->mode & LA_SHAD_RAY)) {
1439
1440                                         if (vn==vnor)   /* tangent trigger */
1441                                                 lamp_get_shadow(lar, shi, dot_v3v3(shi->vn, lv), shadfac, shi->depth);
1442                                         else
1443                                                 lamp_get_shadow(lar, shi, inp, shadfac, shi->depth);
1444
1445                                         /* warning, here it skips the loop */
1446                                         if ((lar->mode & LA_ONLYSHADOW) && i>0.0f) {
1447
1448                                                 shadfac[3]= i*lar->energy*(1.0f-shadfac[3]);
1449                                                 shr->shad[0] -= shadfac[3]*shi->r*(1.0f-lashdw[0]);
1450                                                 shr->shad[1] -= shadfac[3]*shi->g*(1.0f-lashdw[1]);
1451                                                 shr->shad[2] -= shadfac[3]*shi->b*(1.0f-lashdw[2]);
1452
1453                                                 shr->spec[0] -= shadfac[3]*shi->specr*(1.0f-lashdw[0]);
1454                                                 shr->spec[1] -= shadfac[3]*shi->specg*(1.0f-lashdw[1]);
1455                                                 shr->spec[2] -= shadfac[3]*shi->specb*(1.0f-lashdw[2]);
1456
1457                                                 return;
1458                                         }
1459
1460                                         i*= shadfac[3];
1461                                         shr->shad[3] = shadfac[3]; /* store this for possible check in troublesome cases */
1462                                 }
1463                         }
1464                 }
1465
1466                 /* in case 'no diffuse' we still do most calculus, spec can be in shadow.*/
1467                 if (!(lar->mode & LA_NO_DIFF)) {
1468                         if (i>0.0f) {
1469                                 if (ma->mode & MA_SHADOW_TRA)
1470                                         add_to_diffuse(shr->shad, shi, is, i*shadfac[0]*lacol[0], i*shadfac[1]*lacol[1], i*shadfac[2]*lacol[2]);
1471                                 else
1472                                         add_to_diffuse(shr->shad, shi, is, i*lacol[0], i*lacol[1], i*lacol[2]);
1473                         }
1474                         /* add light for colored shadow */
1475                         if (i_noshad>i && !(lashdw[0]==0 && lashdw[1]==0 && lashdw[2]==0)) {
1476                                 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]);
1477                         }
1478                         if (i_noshad>0.0f) {
1479                                 if (passflag & (SCE_PASS_DIFFUSE|SCE_PASS_SHADOW)) {
1480                                         add_to_diffuse(shr->diff, shi, is, i_noshad*lacol[0], i_noshad*lacol[1], i_noshad*lacol[2]);
1481                                 }
1482                                 else
1483                                         copy_v3_v3(shr->diff, shr->shad);
1484                         }
1485                 }
1486
1487                 /* specularity */
1488                 shadfac[3]*= phongcorr; /* note, shadfac not allowed to be stored nonlocal */
1489
1490                 if (shadfac[3]>0.0f && shi->spec!=0.0f && !(lar->mode & LA_NO_SPEC) && !(lar->mode & LA_ONLYSHADOW)) {
1491
1492                         if (!(passflag & (SCE_PASS_COMBINED | SCE_PASS_SPEC))) {
1493                                 /* pass */
1494                         }
1495                         else if (lar->type == LA_HEMI) {
1496                                 float t;
1497                                 /* hemi uses no spec shaders (yet) */
1498
1499                                 lv[0]+= view[0];
1500                                 lv[1]+= view[1];
1501                                 lv[2]+= view[2];
1502
1503                                 normalize_v3(lv);
1504
1505                                 t= vn[0]*lv[0]+vn[1]*lv[1]+vn[2]*lv[2];
1506
1507                                 if (lar->type==LA_HEMI) {
1508                                         t= 0.5f*t+0.5f;
1509                                 }
1510
1511                                 t= shadfac[3]*shi->spec*spec(t, shi->har);
1512
1513                                 shr->spec[0]+= t*(lacol[0] * shi->specr);
1514                                 shr->spec[1]+= t*(lacol[1] * shi->specg);
1515                                 shr->spec[2]+= t*(lacol[2] * shi->specb);
1516                         }
1517                         else {
1518                                 /* specular shaders */
1519                                 float specfac, t;
1520
1521                                 if (ma->spec_shader==MA_SPEC_PHONG)
1522                                         specfac= Phong_Spec(vn, lv, view, shi->har, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1523                                 else if (ma->spec_shader==MA_SPEC_COOKTORR)
1524                                         specfac= CookTorr_Spec(vn, lv, view, shi->har, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1525                                 else if (ma->spec_shader==MA_SPEC_BLINN)
1526                                         specfac= Blinn_Spec(vn, lv, view, ma->refrac, (float)shi->har, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1527                                 else if (ma->spec_shader==MA_SPEC_WARDISO)
1528                                         specfac= WardIso_Spec( vn, lv, view, ma->rms, (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1529                                 else
1530                                         specfac= Toon_Spec(vn, lv, view, ma->param[2], ma->param[3], (vlr->flag & R_TANGENT) || (ma->mode & MA_TANGENT_V));
1531
1532                                 /* area lamp correction */
1533                                 if (lar->type==LA_AREA) specfac*= inp;
1534
1535                                 t= shadfac[3]*shi->spec*visifac*specfac;
1536
1537                                 if (ma->mode & MA_RAMP_SPEC) {
1538                                         float spec[3];
1539                                         do_specular_ramp(shi, specfac, t, spec);
1540                                         shr->spec[0]+= t*(lacol[0] * spec[0]);
1541                                         shr->spec[1]+= t*(lacol[1] * spec[1]);
1542                                         shr->spec[2]+= t*(lacol[2] * spec[2]);
1543                                 }
1544                                 else {
1545                                         shr->spec[0]+= t*(lacol[0] * shi->specr);
1546                                         shr->spec[1]+= t*(lacol[1] * shi->specg);
1547                                         shr->spec[2]+= t*(lacol[2] * shi->specb);
1548                                 }
1549                         }
1550                 }
1551         }
1552 }
1553
1554 static void shade_lamp_loop_only_shadow(ShadeInput *shi, ShadeResult *shr)
1555 {
1556
1557         if (R.r.mode & R_SHADOW) {
1558                 ListBase *lights;
1559                 LampRen *lar;
1560                 GroupObject *go;
1561                 float inpr, lv[3];
1562                 float /* *view, */ shadfac[4];
1563                 float ir, accum, visifac, lampdist;
1564                 float shaded = 0.0f, lightness = 0.0f;
1565
1566
1567                 /* view= shi->view; */ /* UNUSED */
1568                 accum= ir= 0.0f;
1569
1570                 lights= get_lights(shi);
1571                 for (go=lights->first; go; go= go->next) {
1572                         lar= go->lampren;
1573                         if (lar==NULL) continue;
1574
1575                         /* yafray: ignore shading by photonlights, not used in Blender */
1576                         if (lar->type==LA_YF_PHOTON) continue;
1577
1578                         if (lar->mode & LA_LAYER) if ((lar->lay & shi->obi->lay)==0) continue;
1579                         if ((lar->lay & shi->lay)==0) continue;
1580
1581                         if (lar->shb || (lar->mode & LA_SHAD_RAY)) {
1582                                 visifac= lamp_get_visibility(lar, shi->co, lv, &lampdist);
1583                                 ir+= 1.0f;
1584
1585                                 if (visifac <= 0.0f) {
1586                                         if (shi->mat->shadowonly_flag == MA_SO_OLD)
1587                                                 accum+= 1.0f;
1588
1589                                         continue;
1590                                 }
1591                                 inpr= dot_v3v3(shi->vn, lv);
1592                                 if (inpr <= 0.0f) {
1593                                         if (shi->mat->shadowonly_flag == MA_SO_OLD)
1594                                                 accum+= 1.0f;
1595
1596                                         continue;
1597                                 }
1598
1599                                 lamp_get_shadow(lar, shi, inpr, shadfac, shi->depth);
1600
1601                                 if (shi->mat->shadowonly_flag == MA_SO_OLD) {
1602                                         /* Old "Shadows Only" */
1603                                         accum+= (1.0f-visifac) + (visifac)*rgb_to_grayscale(shadfac)*shadfac[3];
1604                                 }
1605                                 else {
1606                                         shaded += rgb_to_grayscale(shadfac)*shadfac[3] * visifac * lar->energy;
1607
1608                                         if (shi->mat->shadowonly_flag == MA_SO_SHADOW) {
1609                                                 lightness += visifac * lar->energy;
1610                                         }
1611                                 }
1612                         }
1613                 }
1614
1615                 /* Apply shadows as alpha */
1616                 if (ir>0.0f) {
1617                         if (shi->mat->shadowonly_flag == MA_SO_OLD) {
1618                                 accum = 1.0f - accum/ir;
1619                         }
1620                         else {
1621                                 if (shi->mat->shadowonly_flag == MA_SO_SHADOW) {
1622                                         if (lightness > 0.0f) {
1623                                                 /* Get shadow value from between 0.0f and non-shadowed lightness */
1624                                                 accum = (lightness - shaded) / (lightness);
1625                                         }
1626                                         else {
1627                                                 accum = 0.0f;
1628                                         }
1629                                 }
1630                                 else { /* shadowonly_flag == MA_SO_SHADED */
1631                                         /* Use shaded value */
1632                                         accum = 1.0f - shaded;
1633                         }}
1634
1635                         shr->alpha= (shi->alpha)*(accum);
1636                         if (shr->alpha<0.0f) shr->alpha=0.0f;
1637                 }
1638                 else {
1639                         /* If "fully shaded", use full alpha even on areas that have no lights */
1640                         if (shi->mat->shadowonly_flag == MA_SO_SHADED) shr->alpha=shi->alpha;
1641                         else shr->alpha= 0.f;
1642                 }
1643         }
1644
1645         /* quite disputable this...  also note it doesn't mirror-raytrace */
1646         if ((R.wrld.mode & (WO_AMB_OCC|WO_ENV_LIGHT)) && shi->amb!=0.0f) {
1647                 float f;
1648
1649                 if (R.wrld.mode & WO_AMB_OCC) {
1650                         f= R.wrld.aoenergy*shi->amb;
1651
1652                         if (R.wrld.aomix==WO_AOADD) {
1653                                 if (shi->mat->shadowonly_flag == MA_SO_OLD) {
1654                                         f= f*(1.0f - rgb_to_grayscale(shi->ao));
1655                                         shr->alpha= (shr->alpha + f)*f;
1656                                 }
1657                                 else {
1658                                         shr->alpha -= f*rgb_to_grayscale(shi->ao);
1659                                         if (shr->alpha<0.0f) shr->alpha=0.0f;
1660                                 }
1661                         }
1662                         else /* AO Multiply */
1663                                 shr->alpha= (1.0f - f)*shr->alpha + f*(1.0f - (1.0f - shr->alpha)*rgb_to_grayscale(shi->ao));
1664                 }
1665
1666                 if (R.wrld.mode & WO_ENV_LIGHT) {
1667                         if (shi->mat->shadowonly_flag == MA_SO_OLD) {
1668                                 f= R.wrld.ao_env_energy*shi->amb*(1.0f - rgb_to_grayscale(shi->env));
1669                                 shr->alpha= (shr->alpha + f)*f;
1670                         }
1671                         else {
1672                                 f= R.wrld.ao_env_energy*shi->amb;
1673                                 shr->alpha -= f*rgb_to_grayscale(shi->env);
1674                                 if (shr->alpha<0.0f) shr->alpha=0.0f;
1675                         }
1676                 }
1677         }
1678 }
1679
1680 /* let's map negative light as if it mirrors positive light, otherwise negative values disappear */
1681 static void wrld_exposure_correct(float diff[3])
1682 {
1683
1684         diff[0]= R.wrld.linfac*(1.0f-expf( diff[0]*R.wrld.logfac) );
1685         diff[1]= R.wrld.linfac*(1.0f-expf( diff[1]*R.wrld.logfac) );
1686         diff[2]= R.wrld.linfac*(1.0f-expf( diff[2]*R.wrld.logfac) );
1687 }
1688
1689 void shade_lamp_loop(ShadeInput *shi, ShadeResult *shr)
1690 {
1691         Material *ma= shi->mat;
1692         int passflag= shi->passflag;
1693
1694         memset(shr, 0, sizeof(ShadeResult));
1695
1696         if (!(shi->mode & MA_TRANSP)) shi->alpha = 1.0f;
1697
1698         /* separate loop */
1699         if (ma->mode & MA_ONLYSHADOW) {
1700                 shade_lamp_loop_only_shadow(shi, shr);
1701                 return;
1702         }
1703
1704         /* envmap hack, always reset */
1705         shi->refcol[0]= shi->refcol[1]= shi->refcol[2]= shi->refcol[3]= 0.0f;
1706
1707         /* material color itself */
1708         if (passflag & (SCE_PASS_COMBINED|SCE_PASS_RGBA)) {
1709                 if (ma->mode & (MA_FACETEXTURE)) {
1710                         shi->r= shi->vcol[0];
1711                         shi->g= shi->vcol[1];
1712                         shi->b= shi->vcol[2];
1713                         if (ma->mode & (MA_FACETEXTURE_ALPHA))
1714                                 shi->alpha= shi->vcol[3];
1715                 }
1716                 else if (ma->mode & (MA_VERTEXCOLP)) {
1717                         float neg_alpha = 1.0f - shi->vcol[3];
1718                         shi->r= shi->r*neg_alpha + shi->vcol[0]*shi->vcol[3];
1719                         shi->g= shi->g*neg_alpha + shi->vcol[1]*shi->vcol[3];
1720                         shi->b= shi->b*neg_alpha + shi->vcol[2]*shi->vcol[3];
1721                 }
1722                 if (ma->texco) {
1723                         do_material_tex(shi, &R);
1724                         if (!(shi->mode & MA_TRANSP)) shi->alpha = 1.0f;
1725                 }
1726
1727                 shr->col[0]= shi->r*shi->alpha;
1728                 shr->col[1]= shi->g*shi->alpha;
1729                 shr->col[2]= shi->b*shi->alpha;
1730                 shr->col[3]= shi->alpha;
1731
1732                 if ((ma->sss_flag & MA_DIFF_SSS) && !sss_pass_done(&R, ma)) {
1733                         if (ma->sss_texfac == 0.0f) {
1734                                 shi->r= shi->g= shi->b= shi->alpha= 1.0f;
1735                                 shr->col[0]= shr->col[1]= shr->col[2]= shr->col[3]= 1.0f;
1736                         }
1737                         else {
1738                                 shi->r= pow(shi->r, ma->sss_texfac);
1739                                 shi->g= pow(shi->g, ma->sss_texfac);
1740                                 shi->b= pow(shi->b, ma->sss_texfac);
1741                                 shi->alpha= pow(shi->alpha, ma->sss_texfac);
1742
1743                                 shr->col[0]= pow(shr->col[0], ma->sss_texfac);
1744                                 shr->col[1]= pow(shr->col[1], ma->sss_texfac);
1745                                 shr->col[2]= pow(shr->col[2], ma->sss_texfac);
1746                                 shr->col[3]= pow(shr->col[3], ma->sss_texfac);
1747                         }
1748                 }
1749         }
1750
1751         if (ma->mode & MA_SHLESS) {
1752                 shr->combined[0]= shi->r;
1753                 shr->combined[1]= shi->g;
1754                 shr->combined[2]= shi->b;
1755                 shr->alpha= shi->alpha;
1756                 return;
1757         }
1758
1759         if ( (ma->mode & (MA_VERTEXCOL|MA_VERTEXCOLP))== MA_VERTEXCOL ) {       /* vertexcolor light */
1760                 shr->emit[0]= shi->r*(shi->emit+shi->vcol[0]*shi->vcol[3]);
1761                 shr->emit[1]= shi->g*(shi->emit+shi->vcol[1]*shi->vcol[3]);
1762                 shr->emit[2]= shi->b*(shi->emit+shi->vcol[2]*shi->vcol[3]);
1763         }
1764         else {
1765                 shr->emit[0]= shi->r*shi->emit;
1766                 shr->emit[1]= shi->g*shi->emit;
1767                 shr->emit[2]= shi->b*shi->emit;
1768         }
1769
1770         /* AO pass */
1771         if (R.wrld.mode & (WO_AMB_OCC|WO_ENV_LIGHT|WO_INDIRECT_LIGHT)) {
1772                 if (((passflag & SCE_PASS_COMBINED) && (shi->combinedflag & (SCE_PASS_AO|SCE_PASS_ENVIRONMENT|SCE_PASS_INDIRECT))) ||
1773                     (passflag & (SCE_PASS_AO|SCE_PASS_ENVIRONMENT|SCE_PASS_INDIRECT)))
1774                 {
1775                         if (R.r.mode & R_SHADOW) {
1776                                 /* AO was calculated for scanline already */
1777                                 if (shi->depth || shi->volume_depth)
1778                                         ambient_occlusion(shi);
1779                                 copy_v3_v3(shr->ao, shi->ao);
1780                                 copy_v3_v3(shr->env, shi->env); /* XXX multiply */
1781                                 copy_v3_v3(shr->indirect, shi->indirect); /* XXX multiply */
1782                         }
1783                 }
1784         }
1785
1786         /* lighting pass */
1787         if (passflag & (SCE_PASS_COMBINED|SCE_PASS_DIFFUSE|SCE_PASS_SPEC|SCE_PASS_SHADOW)) {
1788                 GroupObject *go;
1789                 ListBase *lights;
1790                 LampRen *lar;
1791
1792                 lights= get_lights(shi);
1793                 for (go=lights->first; go; go= go->next) {
1794                         lar= go->lampren;
1795                         if (lar==NULL) continue;
1796
1797                         /* yafray: ignore shading by photonlights, not used in Blender */
1798                         if (lar->type==LA_YF_PHOTON) continue;
1799
1800                         /* test for lamp layer */
1801                         if (lar->mode & LA_LAYER) if ((lar->lay & shi->obi->lay)==0) continue;
1802                         if ((lar->lay & shi->lay)==0) continue;
1803
1804                         /* accumulates in shr->diff and shr->spec and shr->shad (diffuse with shadow!) */
1805                         shade_one_light(lar, shi, shr, passflag);
1806                 }
1807
1808                 /* this check is to prevent only shadow lamps from producing negative
1809                  * colors.*/
1810                 if (shr->spec[0] < 0) shr->spec[0] = 0;
1811                 if (shr->spec[1] < 0) shr->spec[1] = 0;
1812                 if (shr->spec[2] < 0) shr->spec[2] = 0;
1813
1814                 if (shr->shad[0] < 0) shr->shad[0] = 0;
1815                 if (shr->shad[1] < 0) shr->shad[1] = 0;
1816                 if (shr->shad[2] < 0) shr->shad[2] = 0;
1817
1818                 if (ma->sss_flag & MA_DIFF_SSS) {
1819                         float sss[3], col[3], invalpha, texfac= ma->sss_texfac;
1820
1821                         /* this will return false in the preprocess stage */
1822                         if (sample_sss(&R, ma, shi->co, sss)) {
1823                                 invalpha= (shr->col[3] > FLT_EPSILON)? 1.0f/shr->col[3]: 1.0f;
1824
1825                                 if (texfac==0.0f) {
1826                                         copy_v3_v3(col, shr->col);
1827                                         mul_v3_fl(col, invalpha);
1828                                 }
1829                                 else if (texfac==1.0f) {
1830                                         col[0]= col[1]= col[2]= 1.0f;
1831                                         mul_v3_fl(col, invalpha);
1832                                 }
1833                                 else {
1834                                         copy_v3_v3(col, shr->col);
1835                                         mul_v3_fl(col, invalpha);
1836                                         col[0]= pow(col[0], 1.0f-texfac);
1837                                         col[1]= pow(col[1], 1.0f-texfac);
1838                                         col[2]= pow(col[2], 1.0f-texfac);
1839                                 }
1840
1841                                 shr->diff[0]= sss[0]*col[0];
1842                                 shr->diff[1]= sss[1]*col[1];
1843                                 shr->diff[2]= sss[2]*col[2];
1844
1845                                 if (shi->combinedflag & SCE_PASS_SHADOW) {
1846                                         shr->shad[0]= shr->diff[0];
1847                                         shr->shad[1]= shr->diff[1];
1848                                         shr->shad[2]= shr->diff[2];
1849                                 }
1850                         }
1851                 }
1852
1853                 if (shi->combinedflag & SCE_PASS_SHADOW)
1854                         copy_v3_v3(shr->combined, shr->shad);   /* note, no ';' ! */
1855                 else
1856                         copy_v3_v3(shr->combined, shr->diff);
1857
1858                 /* calculate shadow pass, we use a multiplication mask */
1859                 /* if diff = 0,0,0 it doesn't matter what the shadow pass is, so leave it as is */
1860                 if (passflag & SCE_PASS_SHADOW && !(shr->diff[0]==0.0f && shr->diff[1]==0.0f && shr->diff[2]==0.0f)) {
1861                         if (shr->diff[0]!=0.0f) shr->shad[0]= shr->shad[0]/shr->diff[0];
1862                         /* can't determine proper shadow from shad/diff (0/0), so use shadow intensity */
1863                         else if (shr->shad[0]==0.0f) shr->shad[0]= shr->shad[3];
1864
1865                         if (shr->diff[1]!=0.0f) shr->shad[1]= shr->shad[1]/shr->diff[1];
1866                         else if (shr->shad[1]==0.0f) shr->shad[1]= shr->shad[3];
1867
1868                         if (shr->diff[2]!=0.0f) shr->shad[2]= shr->shad[2]/shr->diff[2];
1869                         else if (shr->shad[2]==0.0f) shr->shad[2]= shr->shad[3];
1870                 }
1871
1872                 /* exposure correction */
1873                 if ((R.wrld.exp!=0.0f || R.wrld.range!=1.0f) && !R.sss_points) {
1874                         wrld_exposure_correct(shr->combined);   /* has no spec! */
1875                         wrld_exposure_correct(shr->spec);
1876                 }
1877         }
1878
1879         /* alpha in end, spec can influence it */
1880         if (passflag & (SCE_PASS_COMBINED)) {
1881                 if ((ma->fresnel_tra!=0.0f) && (shi->mode & MA_TRANSP))
1882                         shi->alpha*= fresnel_fac(shi->view, shi->vn, ma->fresnel_tra_i, ma->fresnel_tra);
1883
1884                 /* note: shi->mode! */
1885                 if (shi->mode & MA_TRANSP && (shi->mode & (MA_ZTRANSP|MA_RAYTRANSP))) {
1886                         if (shi->spectra!=0.0f) {
1887                                 float t = MAX3(shr->spec[0], shr->spec[1], shr->spec[2]);
1888                                 t *= shi->spectra;
1889                                 if (t>1.0f) t= 1.0f;
1890                                 shi->alpha= (1.0f-t)*shi->alpha+t;
1891                         }
1892                 }
1893         }
1894         shr->alpha= shi->alpha;
1895
1896         /* from now stuff everything in shr->combined: ambient, AO, ramps, exposure */
1897         if (!(ma->sss_flag & MA_DIFF_SSS) || !sss_pass_done(&R, ma)) {
1898                 if (R.r.mode & R_SHADOW) {
1899                         /* add AO in combined? */
1900                         if (R.wrld.mode & WO_AMB_OCC)
1901                                 if (shi->combinedflag & SCE_PASS_AO)
1902                                         ambient_occlusion_apply(shi, shr);
1903
1904                         if (R.wrld.mode & WO_ENV_LIGHT)
1905                                 if (shi->combinedflag & SCE_PASS_ENVIRONMENT)
1906                                         environment_lighting_apply(shi, shr);
1907
1908                         if (R.wrld.mode & WO_INDIRECT_LIGHT)
1909                                 if (shi->combinedflag & SCE_PASS_INDIRECT)
1910                                         indirect_lighting_apply(shi, shr);
1911                 }
1912
1913                 shr->combined[0]+= shi->ambr;
1914                 shr->combined[1]+= shi->ambg;
1915                 shr->combined[2]+= shi->ambb;
1916
1917                 if (ma->mode & MA_RAMP_COL) ramp_diffuse_result(shr->combined, shi);
1918         }
1919
1920         if (ma->mode & MA_RAMP_SPEC) ramp_spec_result(shr->spec, shi);
1921
1922         /* refcol is for envmap only */
1923         if (shi->refcol[0]!=0.0f) {
1924                 float result[3];
1925
1926                 result[0]= shi->mirr*shi->refcol[1] + (1.0f - shi->mirr*shi->refcol[0])*shr->combined[0];
1927                 result[1]= shi->mirg*shi->refcol[2] + (1.0f - shi->mirg*shi->refcol[0])*shr->combined[1];
1928                 result[2]= shi->mirb*shi->refcol[3] + (1.0f - shi->mirb*shi->refcol[0])*shr->combined[2];
1929
1930                 if (passflag & SCE_PASS_REFLECT)
1931                         sub_v3_v3v3(shr->refl, result, shr->combined);
1932
1933                 if (shi->combinedflag & SCE_PASS_REFLECT)
1934                         copy_v3_v3(shr->combined, result);
1935
1936         }
1937
1938         /* and add emit and spec */
1939         if (shi->combinedflag & SCE_PASS_EMIT)
1940                 add_v3_v3(shr->combined, shr->emit);
1941         if (shi->combinedflag & SCE_PASS_SPEC)
1942                 add_v3_v3(shr->combined, shr->spec);
1943
1944         /* modulate by the object color */
1945         if ((ma->shade_flag & MA_OBCOLOR) && shi->obr->ob) {
1946                 if (!(ma->sss_flag & MA_DIFF_SSS) || !sss_pass_done(&R, ma)) {
1947                         float obcol[4];
1948
1949                         copy_v4_v4(obcol, shi->obr->ob->col);
1950                         CLAMP(obcol[3], 0.0f, 1.0f);
1951
1952                         shr->combined[0] *= obcol[0];
1953                         shr->combined[1] *= obcol[1];
1954                         shr->combined[2] *= obcol[2];
1955                         if (shi->mode & MA_TRANSP) shr->alpha *= obcol[3];
1956                 }
1957         }
1958
1959         shr->combined[3]= shr->alpha;
1960 }
1961