source/blender/render/intern/source/pixelshading.c

   1 /**
   2  *
   3  * ***** BEGIN GPL LICENSE BLOCK *****
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software Foundation,
  17  * Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18  *
  19  * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
  20  * All rights reserved.
  21  *
  22  * Contributor(s): 2004-2006, Blender Foundation, full recode
  23  *
  24  * ***** END GPL LICENSE BLOCK *****
  25  */
  26
  27 #include <float.h>
  28 #include <math.h>
  29 #include <string.h>
  30 #include "BLI_arithb.h"
  31
  32 /* External modules: */
  33 #include "IMB_imbuf_types.h"
  34 #include "IMB_imbuf.h"
  35 #include "MTC_matrixops.h"
  36 #include "MTC_vectorops.h"
  37
  38 #include "DNA_camera_types.h"
  39 #include "DNA_group_types.h"
  40 #include "DNA_material_types.h"
  41 #include "DNA_object_types.h"
  42 #include "DNA_image_types.h"
  43 #include "DNA_texture_types.h"
  44 #include "DNA_lamp_types.h"
  45
  46 #include "BKE_image.h"
  47 #include "BKE_global.h"
  48 #include "BKE_texture.h"
  49 #include "BKE_utildefines.h"
  50
  51 /* own module */
  52 #include "render_types.h"
  53 #include "renderpipeline.h"
  54 #include "renderdatabase.h"
  55 #include "texture.h"
  56 #include "pixelblending.h"
  57 #include "rendercore.h"
  58 #include "shadbuf.h"
  59 #include "pixelshading.h"
  60
  61 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
  62 /* defined in pipeline.c, is hardcopy of active dynamic allocated Render */
  63 /* only to be used here in this file, it's for speed */
  64 extern struct Render R;
  65 /* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */
  66
  67
  68 extern float hashvectf[];
  69
  70 static void render_lighting_halo(HaloRen *har, float *colf)
  71 {
  72         GroupObject *go;
  73         LampRen *lar;
  74         float i, inp, inpr, rco[3], dco[3], lv[3], lampdist, ld, t, *vn;
  75         float ir, ig, ib, shadfac, soft, lacol[3];
  76
  77         ir= ig= ib= 0.0;
  78
  79         VECCOPY(rco, har->co);
  80         dco[0]=dco[1]=dco[2]= 1.0/har->rad;
  81
  82         vn= har->no;
  83
  84         for(go=R.lights.first; go; go= go->next) {
  85                 lar= go->lampren;
  86
  87                 /* test for lamplayer */
  88                 if(lar->mode & LA_LAYER) if((lar->lay & har->lay)==0) continue;
  89
  90                 /* lampdist cacluation */
  91                 if(lar->type==LA_SUN || lar->type==LA_HEMI) {
  92                         VECCOPY(lv, lar->vec);
  93                         lampdist= 1.0;
  94                 }
  95                 else {
  96                         lv[0]= rco[0]-lar->co[0];
  97                         lv[1]= rco[1]-lar->co[1];
  98                         lv[2]= rco[2]-lar->co[2];
  99                         ld= sqrt(lv[0]*lv[0]+lv[1]*lv[1]+lv[2]*lv[2]);
 100                         lv[0]/= ld;
 101                         lv[1]/= ld;
 102                         lv[2]/= ld;
 103
 104                         /* ld is re-used further on (texco's) */
 105
 106                         if(lar->mode & LA_QUAD) {
 107                                 t= 1.0;
 108                                 if(lar->ld1>0.0)
 109                                         t= lar->dist/(lar->dist+lar->ld1*ld);
 110                                 if(lar->ld2>0.0)
 111                                         t*= lar->distkw/(lar->distkw+lar->ld2*ld*ld);
 112
 113                                 lampdist= t;
 114                         }
 115                         else {
 116                                 lampdist= (lar->dist/(lar->dist+ld));
 117                         }
 118
 119                         if(lar->mode & LA_SPHERE) {
 120                                 t= lar->dist - ld;
 121                                 if(t<0.0) continue;
 122
 123                                 t/= lar->dist;
 124                                 lampdist*= (t);
 125                         }
 126
 127                 }
 128
 129                 lacol[0]= lar->r;
 130                 lacol[1]= lar->g;
 131                 lacol[2]= lar->b;
 132
 133                 if(lar->mode & LA_TEXTURE) {
 134                         ShadeInput shi;
 135
 136                         /* Warning, This is not that nice, and possibly a bit slow,
 137                         however some variables were not initialized properly in, unless using shade_input_initialize(...), we need to do a memset */
 138                         memset(&shi, 0, sizeof(ShadeInput));
 139                         /* end warning! - Campbell */
 140
 141                         VECCOPY(shi.co, rco);
 142                         shi.osatex= 0;
 143                         do_lamp_tex(lar, lv, &shi, lacol);
 144                 }
 145
 146                 if(lar->type==LA_SPOT) {
 147
 148                         if(lar->mode & LA_SQUARE) {
 149                                 if(lv[0]*lar->vec[0]+lv[1]*lar->vec[1]+lv[2]*lar->vec[2]>0.0) {
 150                                         float x, lvrot[3];
 151
 152                                         /* rotate view to lampspace */
 153                                         VECCOPY(lvrot, lv);
 154                                         MTC_Mat3MulVecfl(lar->imat, lvrot);
 155
 156                                         x= MAX2(fabs(lvrot[0]/lvrot[2]) , fabs(lvrot[1]/lvrot[2]));
 157                                         /* 1.0/(sqrt(1+x*x)) is equivalent to cos(atan(x)) */
 158
 159                                         inpr= 1.0/(sqrt(1.0+x*x));
 160                                 }
 161                                 else inpr= 0.0;
 162                         }
 163                         else {
 164                                 inpr= lv[0]*lar->vec[0]+lv[1]*lar->vec[1]+lv[2]*lar->vec[2];
 165                         }
 166
 167                         t= lar->spotsi;
 168                         if(inpr<t) continue;
 169                         else {
 170                                 t= inpr-t;
 171                                 i= 1.0;
 172                                 soft= 1.0;
 173                                 if(t<lar->spotbl && lar->spotbl!=0.0) {
 174                                         /* soft area */
 175                                         i= t/lar->spotbl;
 176                                         t= i*i;
 177                                         soft= (3.0*t-2.0*t*i);
 178                                         inpr*= soft;
 179                                 }
 180                                 if(lar->mode & LA_ONLYSHADOW) {
 181                                         /* if(ma->mode & MA_SHADOW) { */
 182                                         /* dot product positive: front side face! */
 183                                         inp= vn[0]*lv[0] + vn[1]*lv[1] + vn[2]*lv[2];
 184                                         if(inp>0.0) {
 185                                                 /* testshadowbuf==0.0 : 100% shadow */
 186                                                 shadfac = testshadowbuf(&R, lar->shb, rco, dco, dco, inp, 0.0f);
 187                                                 if( shadfac>0.0 ) {
 188                                                         shadfac*= inp*soft*lar->energy;
 189                                                         ir -= shadfac;
 190                                                         ig -= shadfac;
 191                                                         ib -= shadfac;
 192
 193                                                         continue;
 194                                                 }
 195                                         }
 196                                         /* } */
 197                                 }
 198                                 lampdist*=inpr;
 199                         }
 200                         if(lar->mode & LA_ONLYSHADOW) continue;
 201
 202                 }
 203
 204                 /* dot product and  reflectivity*/
 205
 206                 inp= 1.0-fabs(vn[0]*lv[0] + vn[1]*lv[1] + vn[2]*lv[2]);
 207
 208                 /* inp= cos(0.5*M_PI-acos(inp)); */
 209
 210                 i= inp;
 211
 212                 if(lar->type==LA_HEMI) {
 213                         i= 0.5*i+0.5;
 214                 }
 215                 if(i>0.0) {
 216                         i*= lampdist;
 217                 }
 218
 219                 /* shadow  */
 220                 if(i> -0.41) {                  /* heuristic valua! */
 221                         shadfac= 1.0;
 222                         if(lar->shb) {
 223                                 shadfac = testshadowbuf(&R, lar->shb, rco, dco, dco, inp, 0.0f);
 224                                 if(shadfac==0.0) continue;
 225                                 i*= shadfac;
 226                         }
 227                 }
 228
 229                 if(i>0.0) {
 230                         ir+= i*lacol[0];
 231                         ig+= i*lacol[1];
 232                         ib+= i*lacol[2];
 233                 }
 234         }
 235
 236         if(ir<0.0) ir= 0.0;
 237         if(ig<0.0) ig= 0.0;
 238         if(ib<0.0) ib= 0.0;
 239
 240         colf[0]*= ir;
 241         colf[1]*= ig;
 242         colf[2]*= ib;
 243
 244 }
 245
 246
 247 /**
 248  * Converts a halo z-buffer value to distance from the camera's near plane
 249  * @param z The z-buffer value to convert
 250  * @return a distance from the camera's near plane in blender units
 251  */
 252 static float haloZtoDist(int z)
 253 {
 254         float zco = 0;
 255
 256         if(z >= 0x7FFFFF)
 257                 return 10e10;
 258         else {
 259                 zco = (float)z/(float)0x7FFFFF;
 260                 if(R.r.mode & R_ORTHO)
 261                         return (R.winmat[3][2] - zco*R.winmat[3][3])/(R.winmat[2][2]);
 262                 else
 263                         return (R.winmat[3][2])/(R.winmat[2][2] - R.winmat[2][3]*zco);
 264         }
 265 }
 266
 267 /**
 268  * @param col (float[4]) Store the rgb color here (with alpha)
 269  * The alpha is used to blend the color to the background
 270  * color_new = (1-alpha)*color_background + color
 271  * @param zz The current zbuffer value at the place of this pixel
 272  * @param dist Distance of the pixel from the center of the halo squared. Given in pixels
 273  * @param xn The x coordinate of the pixel relaticve to the center of the halo. given in pixels
 274  * @param yn The y coordinate of the pixel relaticve to the center of the halo. given in pixels
 275  */
 276 int shadeHaloFloat(HaloRen *har,  float *col, int zz,
 277                                         float dist, float xn,  float yn, short flarec)
 278 {
 279         /* fill in col */
 280         float t, zn, radist, ringf=0.0f, linef=0.0f, alpha, si, co;
 281         int a;
 282
 283         if(R.wrld.mode & WO_MIST) {
 284        if(har->type & HA_ONLYSKY) {
 285            /* stars but no mist */
 286            alpha= har->alfa;
 287        }
 288        else {
 289            /* a bit patchy... */
 290            alpha= mistfactor(-har->co[2], har->co)*har->alfa;
 291        }
 292         }
 293         else alpha= har->alfa;
 294
 295         if(alpha==0.0)
 296                 return 0;
 297
 298         /* soften the halo if it intersects geometry */
 299         if(har->mat->mode & MA_HALO_SOFT) {
 300                 float segment_length, halo_depth, distance_from_z, visible_depth, soften;
 301
 302                 /* calculate halo depth */
 303                 segment_length= har->hasize*sasqrt(1.0f - dist/(har->rad*har->rad));
 304                 halo_depth= 2.0f*segment_length;
 305
 306                 if(halo_depth < FLT_EPSILON)
 307                         return 0;
 308
 309                 /* calculate how much of this depth is visible */
 310                 distance_from_z = haloZtoDist(zz) - haloZtoDist(har->zs);
 311                 visible_depth = halo_depth;
 312                 if(distance_from_z < segment_length) {
 313                         soften= (segment_length + distance_from_z)/halo_depth;
 314
 315                         /* apply softening to alpha */
 316                         if(soften < 1.0f)
 317                                 alpha *= soften;
 318                         if(alpha <= 0.0f)
 319                                 return 0;
 320                 }
 321         }
 322         else {
 323                 /* not a soft halo. use the old softening code */
 324                 /* halo being intersected? */
 325                 if(har->zs> zz-har->zd) {
 326                         t= ((float)(zz-har->zs))/(float)har->zd;
 327                         alpha*= sqrt(sqrt(t));
 328                 }
 329         }
 330
 331         radist= sqrt(dist);
 332
 333         /* watch it: not used nicely: flarec is set at zero in pixstruct */
 334         if(flarec) har->pixels+= (int)(har->rad-radist);
 335
 336         if(har->ringc) {
 337                 float *rc, fac;
 338                 int ofs;
 339
 340                 /* per ring an antialised circle */
 341                 ofs= har->seed;
 342
 343                 for(a= har->ringc; a>0; a--, ofs+=2) {
 344
 345                         rc= hashvectf + (ofs % 768);
 346
 347                         fac= fabs( rc[1]*(har->rad*fabs(rc[0]) - radist) );
 348
 349                         if(fac< 1.0) {
 350                                 ringf+= (1.0-fac);
 351                         }
 352                 }
 353         }
 354
 355         if(har->type & HA_VECT) {
 356                 dist= fabs( har->cos*(yn) - har->sin*(xn) )/har->rad;
 357                 if(dist>1.0) dist= 1.0;
 358                 if(har->tex) {
 359                         zn= har->sin*xn - har->cos*yn;
 360                         yn= har->cos*xn + har->sin*yn;
 361                         xn= zn;
 362                 }
 363         }
 364         else dist= dist/har->radsq;
 365
 366         if(har->type & HA_FLARECIRC) {
 367
 368                 dist= 0.5+fabs(dist-0.5);
 369
 370         }
 371
 372         if(har->hard>=30) {
 373                 dist= sqrt(dist);
 374                 if(har->hard>=40) {
 375                         dist= sin(dist*M_PI_2);
 376                         if(har->hard>=50) {
 377                                 dist= sqrt(dist);
 378                         }
 379                 }
 380         }
 381         else if(har->hard<20) dist*=dist;
 382
 383         if(dist < 1.0f)
 384                 dist= (1.0f-dist);
 385         else
 386                 dist= 0.0f;
 387
 388         if(har->linec) {
 389                 float *rc, fac;
 390                 int ofs;
 391
 392                 /* per starpoint an antialiased line */
 393                 ofs= har->seed;
 394
 395                 for(a= har->linec; a>0; a--, ofs+=3) {
 396
 397                         rc= hashvectf + (ofs % 768);
 398
 399                         fac= fabs( (xn)*rc[0]+(yn)*rc[1]);
 400
 401                         if(fac< 1.0f )
 402                                 linef+= (1.0f-fac);
 403                 }
 404
 405                 linef*= dist;
 406         }
 407
 408         if(har->starpoints) {
 409                 float ster, angle;
 410                 /* rotation */
 411                 angle= atan2(yn, xn);
 412                 angle*= (1.0+0.25*har->starpoints);
 413
 414                 co= cos(angle);
 415                 si= sin(angle);
 416
 417                 angle= (co*xn+si*yn)*(co*yn-si*xn);
 418
 419                 ster= fabs(angle);
 420                 if(ster>1.0) {
 421                         ster= (har->rad)/(ster);
 422
 423                         if(ster<1.0) dist*= sqrt(ster);
 424                 }
 425         }
 426
 427         /* disputable optimize... (ton) */
 428         if(dist<=0.00001)
 429                 return 0;
 430
 431         dist*= alpha;
 432         ringf*= dist;
 433         linef*= alpha;
 434
 435         /* The color is either the rgb spec-ed by the user, or extracted from   */
 436         /* the texture                                                           */
 437         if(har->tex) {
 438                 col[0]= har->r;
 439                 col[1]= har->g;
 440                 col[2]= har->b;
 441                 col[3]= dist;
 442
 443                 do_halo_tex(har, xn, yn, col);
 444
 445                 col[0]*= col[3];
 446                 col[1]*= col[3];
 447                 col[2]*= col[3];
 448
 449         }
 450         else {
 451                 col[0]= dist*har->r;
 452                 col[1]= dist*har->g;
 453                 col[2]= dist*har->b;
 454                 if(har->type & HA_XALPHA) col[3]= dist*dist;
 455                 else col[3]= dist;
 456         }
 457
 458         if(har->mat) {
 459                 if(har->mat->mode & MA_HALO_SHADE) {
 460                         /* we test for lights because of preview... */
 461                         if(R.lights.first) render_lighting_halo(har, col);
 462                 }
 463
 464                 /* Next, we do the line and ring factor modifications. */
 465                 if(linef!=0.0) {
 466                         Material *ma= har->mat;
 467
 468                         col[0]+= linef * ma->specr;
 469                         col[1]+= linef * ma->specg;
 470                         col[2]+= linef * ma->specb;
 471
 472                         if(har->type & HA_XALPHA) col[3]+= linef*linef;
 473                         else col[3]+= linef;
 474                 }
 475                 if(ringf!=0.0) {
 476                         Material *ma= har->mat;
 477
 478                         col[0]+= ringf * ma->mirr;
 479                         col[1]+= ringf * ma->mirg;
 480                         col[2]+= ringf * ma->mirb;
 481
 482                         if(har->type & HA_XALPHA) col[3]+= ringf*ringf;
 483                         else col[3]+= ringf;
 484                 }
 485         }
 486
 487         /* alpha requires clip, gives black dots */
 488         if(col[3] > 1.0f)
 489                 col[3]= 1.0f;
 490
 491         return 1;
 492 }
 493
 494 /* ------------------------------------------------------------------------- */
 495
 496 static void fillBackgroundImage(float *collector, float fx, float fy)
 497 {
 498         collector[0] = 0.0;
 499         collector[1] = 0.0;
 500         collector[2] = 0.0;
 501         collector[3] = 0.0;
 502
 503         if(R.backbuf) {
 504                 float dx= 1.0f/(float)R.winx;
 505                 float dy= 1.0f/(float)R.winy;
 506
 507                 image_sample(R.backbuf, fx*dx, fy*dy, dx, dy, collector);
 508         }
 509 }
 510
 511 /* Only view vector is important here. Result goes to colf[3] */
 512 void shadeSkyView(float *colf, float *rco, float *view, float *dxyview)
 513 {
 514         float lo[3], zen[3], hor[3], blend, blendm;
 515         int skyflag;
 516
 517         /* flag indicating if we render the top hemisphere */
 518         skyflag = WO_ZENUP;
 519
 520         /* Some view vector stuff. */
 521         if(R.wrld.skytype & WO_SKYREAL) {
 522
 523                 blend= view[0]*R.grvec[0]+ view[1]*R.grvec[1]+ view[2]*R.grvec[2];
 524
 525                 if(blend<0.0) skyflag= 0;
 526
 527                 blend= fabs(blend);
 528         }
 529         else if(R.wrld.skytype & WO_SKYPAPER) {
 530                 blend= 0.5+ 0.5*view[1];
 531         }
 532         else {
 533                 /* the fraction of how far we are above the bottom of the screen */
 534                 blend= fabs(0.5+ view[1]);
 535         }
 536
 537         hor[0]= R.wrld.horr; hor[1]= R.wrld.horg; hor[2]= R.wrld.horb;
 538         zen[0]= R.wrld.zenr; zen[1]= R.wrld.zeng; zen[2]= R.wrld.zenb;
 539
 540         /* Careful: SKYTEX and SKYBLEND are NOT mutually exclusive! If           */
 541         /* SKYBLEND is active, the texture and color blend are added.           */
 542         if(R.wrld.skytype & WO_SKYTEX) {
 543                 VECCOPY(lo, view);
 544                 if(R.wrld.skytype & WO_SKYREAL) {
 545
 546                         MTC_Mat3MulVecfl(R.imat, lo);
 547
 548                         SWAP(float, lo[1],  lo[2]);
 549
 550                 }
 551                 do_sky_tex(rco, lo, dxyview, hor, zen, &blend, skyflag);
 552         }
 553
 554         if(blend>1.0) blend= 1.0;
 555         blendm= 1.0-blend;
 556
 557         /* No clipping, no conversion! */
 558         if(R.wrld.skytype & WO_SKYBLEND) {
 559                 colf[0] = (blendm*hor[0] + blend*zen[0]);
 560                 colf[1] = (blendm*hor[1] + blend*zen[1]);
 561                 colf[2] = (blendm*hor[2] + blend*zen[2]);
 562         } else {
 563                 /* Done when a texture was grabbed. */
 564                 colf[0]= hor[0];
 565                 colf[1]= hor[1];
 566                 colf[2]= hor[2];
 567         }
 568 }
 569
 570 /*
 571   Stuff the sky color into the collector.
 572  */
 573 void shadeSkyPixel(float *collector, float fx, float fy)
 574 {
 575         float view[3], dxyview[2];
 576
 577         /*
 578           The rules for sky:
 579           1. Draw an image, if a background image was provided. Stop
 580           2. get texture and color blend, and combine these.
 581         */
 582
 583         float fac;
 584
 585         /* 1. Do a backbuffer image: */
 586         if(R.r.bufflag & 1) {
 587                 fillBackgroundImage(collector, fx, fy);
 588                 return;
 589         }
 590         else if((R.wrld.skytype & (WO_SKYBLEND+WO_SKYTEX))==0) {
 591                 /* 2. solid color */
 592                 collector[0] = R.wrld.horr;
 593                 collector[1] = R.wrld.horg;
 594                 collector[2] = R.wrld.horb;
 595                 collector[3] = 0.0f;
 596         }
 597         else {
 598                 /* 3. */
 599
 600                 /* This one true because of the context of this routine  */
 601                 if(R.wrld.skytype & WO_SKYPAPER) {
 602                         view[0]= -1.0f + 2.0f*(fx/(float)R.winx);
 603                         view[1]= -1.0f + 2.0f*(fy/(float)R.winy);
 604                         view[2]= 0.0;
 605
 606                         dxyview[0]= 1.0f/(float)R.winx;
 607                         dxyview[1]= 1.0f/(float)R.winy;
 608                 }
 609                 else {
 610                         calc_view_vector(view, fx, fy);
 611                         fac= Normalize(view);
 612
 613                         if(R.wrld.skytype & WO_SKYTEX) {
 614                                 dxyview[0]= -R.viewdx/fac;
 615                                 dxyview[1]= -R.viewdy/fac;
 616                         }
 617                 }
 618
 619                 /* get sky color in the collector */
 620                 shadeSkyView(collector, NULL, view, dxyview);
 621                 collector[3] = 0.0f;
 622         }
 623 }
 624
 625
 626 /* eof */