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