2 Copyright (C) 1996-1997 Id Software, Inc.
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.
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.
13 See the GNU General Public License for more details.
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
17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 rdlight_t r_dlight[MAX_DLIGHTS];
27 cvar_t r_lightmodels = {CVAR_SAVE, "r_lightmodels", "1"};
28 cvar_t r_vismarklights = {0, "r_vismarklights", "1"};
29 cvar_t r_lightmodelhardness = {CVAR_SAVE, "r_lightmodelhardness", "0.9"};
31 static rtexture_t *lightcorona;
32 static rtexturepool_t *lighttexturepool;
34 void r_light_start(void)
38 byte pixels[32][32][4];
39 lighttexturepool = R_AllocTexturePool();
40 for (y = 0;y < 32;y++)
42 dy = (y - 15.5f) * (1.0f / 16.0f);
43 for (x = 0;x < 32;x++)
45 dx = (x - 15.5f) * (1.0f / 16.0f);
46 a = ((1.0f / (dx * dx + dy * dy + 0.2f)) - (1.0f / (1.0f + 0.2))) * 8.0f / (1.0f / (1.0f + 0.2));
48 pixels[y][x][0] = 255;
49 pixels[y][x][1] = 255;
50 pixels[y][x][2] = 255;
53 // for testing the size of the corona textures
56 pixels[y][x][0] = 255;
59 pixels[y][x][3] = 255;
64 lightcorona = R_LoadTexture (lighttexturepool, "lightcorona", 32, 32, &pixels[0][0][0], TEXTYPE_RGBA, TEXF_PRECACHE | TEXF_ALPHA);
67 void r_light_shutdown(void)
69 lighttexturepool = NULL;
73 void r_light_newmap(void)
77 void R_Light_Init(void)
79 Cvar_RegisterVariable(&r_lightmodels);
80 Cvar_RegisterVariable(&r_lightmodelhardness);
81 Cvar_RegisterVariable(&r_vismarklights);
82 R_RegisterModule("R_Light", r_light_start, r_light_shutdown, r_light_newmap);
90 void R_AnimateLight (void)
96 // 'm' is normal light, 'a' is no light, 'z' is double bright
97 i = (int)(cl.time * 10);
98 for (j = 0;j < MAX_LIGHTSTYLES;j++)
100 if (!cl_lightstyle[j].length)
102 d_lightstylevalue[j] = 256;
105 k = i % cl_lightstyle[j].length;
106 k = cl_lightstyle[j].map[k] - 'a';
108 d_lightstylevalue[j] = k;
113 void R_BuildLightList(void)
122 if (!r_dynamic.integer)
125 for (i = 0;i < MAX_DLIGHTS;i++)
130 rd = &r_dlight[r_numdlights++];
131 VectorCopy(cd->origin, rd->origin);
132 VectorScale(cd->color, cd->radius * 128.0f, rd->light);
133 rd->cullradius = (1.0f / 128.0f) * sqrt(DotProduct(rd->light, rd->light));
134 // clamp radius to avoid overflowing division table in lightmap code
135 if (rd->cullradius > 2048.0f)
136 rd->cullradius = 2048.0f;
137 rd->cullradius2 = rd->cullradius * rd->cullradius;
138 rd->lightsubtract = 1.0f / rd->cullradius2;
141 c_dlights++; // count every dlight in use
145 static int coronapolyindex[6] = {0, 1, 2, 0, 2, 3};
147 void R_DrawCoronas(void)
151 float tvxyz[4][4], tvst[4][2], scale, viewdist, diff[3], dist;
153 memset(&m, 0, sizeof(m));
154 m.transparent = false;
155 m.blendfunc1 = GL_SRC_ALPHA;
156 m.blendfunc2 = GL_ONE;
157 m.depthdisable = true; // magic
160 m.index = coronapolyindex;
161 m.vertex = &tvxyz[0][0];
162 m.vertexstep = sizeof(float[4]);
163 m.tex[0] = R_GetTexture(lightcorona);
164 m.texcoords[0] = &tvst[0][0];
165 m.texcoordstep[0] = sizeof(float[2]);
174 viewdist = DotProduct(r_origin, vpn);
175 for (i = 0;i < r_numdlights;i++)
178 dist = (DotProduct(rd->origin, vpn) - viewdist);
181 // trace to a point just barely closer to the eye
182 VectorSubtract(rd->origin, vpn, diff);
183 if (TraceLine(r_origin, diff, NULL, NULL, 0, true) == 1)
185 //scale = 1.0f / 65536.0f;//64.0f / (dist * dist + 1024.0f);
186 scale = 1.0f / 4096.0f;
187 m.cr = rd->light[0] * scale;
188 m.cg = rd->light[1] * scale;
189 m.cb = rd->light[2] * scale;
193 VectorSubtract(rd->origin, r_origin, diff);
194 m.ca *= 1 - exp(fogdensity/DotProduct(diff,diff));
196 // make it larger in the distance to keep a consistent size
197 //scale = 0.4f * dist;
199 scale = rd->cullradius * 0.25f;
200 tvxyz[0][0] = rd->origin[0] - vright[0] * scale - vup[0] * scale;
201 tvxyz[0][1] = rd->origin[1] - vright[1] * scale - vup[1] * scale;
202 tvxyz[0][2] = rd->origin[2] - vright[2] * scale - vup[2] * scale;
203 tvxyz[1][0] = rd->origin[0] - vright[0] * scale + vup[0] * scale;
204 tvxyz[1][1] = rd->origin[1] - vright[1] * scale + vup[1] * scale;
205 tvxyz[1][2] = rd->origin[2] - vright[2] * scale + vup[2] * scale;
206 tvxyz[2][0] = rd->origin[0] + vright[0] * scale + vup[0] * scale;
207 tvxyz[2][1] = rd->origin[1] + vright[1] * scale + vup[1] * scale;
208 tvxyz[2][2] = rd->origin[2] + vright[2] * scale + vup[2] * scale;
209 tvxyz[3][0] = rd->origin[0] + vright[0] * scale - vup[0] * scale;
210 tvxyz[3][1] = rd->origin[1] + vright[1] * scale - vup[1] * scale;
211 tvxyz[3][2] = rd->origin[2] + vright[2] * scale - vup[2] * scale;
212 R_Mesh_DrawDecal(&m);
219 =============================================================================
223 =============================================================================
231 static void R_OldMarkLights (vec3_t lightorigin, rdlight_t *rd, int bit, int bitindex, mnode_t *node)
233 float ndist, maxdist;
238 if (!r_dynamic.integer)
241 // for comparisons to minimum acceptable light
242 maxdist = rd->cullradius2;
245 if (node->contents < 0)
247 if (node->contents != CONTENTS_SOLID)
249 leaf = (mleaf_t *)node;
250 if (leaf->dlightframe != r_framecount) // not dynamic until now
252 leaf->dlightbits[0] = leaf->dlightbits[1] = leaf->dlightbits[2] = leaf->dlightbits[3] = leaf->dlightbits[4] = leaf->dlightbits[5] = leaf->dlightbits[6] = leaf->dlightbits[7] = 0;
253 leaf->dlightframe = r_framecount;
255 leaf->dlightbits[bitindex] |= bit;
260 ndist = PlaneDiff(lightorigin, node->plane);
262 if (ndist > rd->cullradius)
264 node = node->children[0];
267 if (ndist < -rd->cullradius)
269 node = node->children[1];
274 surf = currentrenderentity->model->surfaces + node->firstsurface;
275 for (i=0 ; i<node->numsurfaces ; i++, surf++)
277 int d, impacts, impactt;
278 float dist, dist2, impact[3];
279 if (surf->visframe != r_framecount)
282 if (surf->flags & SURF_PLANEBACK)
285 if (dist < -0.25f && !(surf->flags & SURF_LIGHTBOTHSIDES))
289 if (dist2 >= maxdist)
292 impact[0] = rd->origin[0] - surf->plane->normal[0] * dist;
293 impact[1] = rd->origin[1] - surf->plane->normal[1] * dist;
294 impact[2] = rd->origin[2] - surf->plane->normal[2] * dist;
296 impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
298 d = bound(0, impacts, surf->extents[0] + 16) - impacts;
303 impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
305 d = bound(0, impactt, surf->extents[1] + 16) - impactt;
312 d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
317 if (dist2 >= maxdist)
322 d -= surf->extents[0] + 16;
326 if (dist2 >= maxdist)
331 d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
336 if (dist2 >= maxdist)
341 d -= surf->extents[1] + 16;
345 if (dist2 >= maxdist)
351 if (surf->dlightframe != r_framecount) // not dynamic until now
353 surf->dlightbits[0] = surf->dlightbits[1] = surf->dlightbits[2] = surf->dlightbits[3] = surf->dlightbits[4] = surf->dlightbits[5] = surf->dlightbits[6] = surf->dlightbits[7] = 0;
354 surf->dlightframe = r_framecount;
356 surf->dlightbits[bitindex] |= bit;
359 if (((surf->flags & SURF_PLANEBACK) == 0) == ((PlaneDist(lightorigin, surf->plane)) >= surf->plane->dist))
361 if (surf->dlightframe != r_framecount) // not dynamic until now
363 surf->dlightbits[0] = surf->dlightbits[1] = surf->dlightbits[2] = surf->dlightbits[3] = surf->dlightbits[4] = surf->dlightbits[5] = surf->dlightbits[6] = surf->dlightbits[7] = 0;
364 surf->dlightframe = r_framecount;
366 surf->dlightbits[bitindex] |= bit;
371 if (node->children[0]->contents >= 0)
373 if (node->children[1]->contents >= 0)
375 R_OldMarkLights (lightorigin, rd, bit, bitindex, node->children[0]);
376 node = node->children[1];
381 node = node->children[0];
385 else if (node->children[1]->contents >= 0)
387 node = node->children[1];
393 static void R_NoVisMarkLights (rdlight_t *rd, int bit, int bitindex)
396 softwareuntransform(rd->origin, lightorigin);
398 R_OldMarkLights(lightorigin, rd, bit, bitindex, currentrenderentity->model->nodes + currentrenderentity->model->hulls[0].firstclipnode);
402 static void R_VisMarkLights (rdlight_t *rd, int bit, int bitindex)
404 static int lightframe = 0;
408 int i, k, m, c, leafnum;
409 msurface_t *surf, **mark;
413 float low[3], high[3], dist, maxdist;
415 if (!r_dynamic.integer)
418 model = currentrenderentity->model;
419 softwareuntransform(rd->origin, lightorigin);
421 if (!r_vismarklights.integer)
423 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
427 pvsleaf = Mod_PointInLeaf (lightorigin, model);
430 Con_Printf("R_VisMarkLights: NULL leaf??\n");
431 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
435 in = pvsleaf->compressed_vis;
438 // no vis info, so make all visible
439 R_OldMarkLights(lightorigin, rd, bit, bitindex, model->nodes + model->hulls[0].firstclipnode);
445 low[0] = lightorigin[0] - rd->cullradius;low[1] = lightorigin[1] - rd->cullradius;low[2] = lightorigin[2] - rd->cullradius;
446 high[0] = lightorigin[0] + rd->cullradius;high[1] = lightorigin[1] + rd->cullradius;high[2] = lightorigin[2] + rd->cullradius;
448 // for comparisons to minimum acceptable light
449 maxdist = rd->cullradius2;
451 row = (model->numleafs+7)>>3;
459 for (i = 0;i < 8;i++)
463 // warning to the clumsy: numleafs is one less than it should be, it only counts leafs with vis bits (skips leaf 0)
464 leafnum = (k << 3)+i+1;
465 if (leafnum > model->numleafs)
467 leaf = &model->leafs[leafnum];
468 if (leaf->visframe != r_framecount
469 || leaf->contents == CONTENTS_SOLID
470 || leaf->mins[0] > high[0] || leaf->maxs[0] < low[0]
471 || leaf->mins[1] > high[1] || leaf->maxs[1] < low[1]
472 || leaf->mins[2] > high[2] || leaf->maxs[2] < low[2])
474 if (leaf->dlightframe != r_framecount)
476 // not dynamic until now
477 leaf->dlightbits[0] = leaf->dlightbits[1] = leaf->dlightbits[2] = leaf->dlightbits[3] = leaf->dlightbits[4] = leaf->dlightbits[5] = leaf->dlightbits[6] = leaf->dlightbits[7] = 0;
478 leaf->dlightframe = r_framecount;
480 leaf->dlightbits[bitindex] |= bit;
481 if ((m = leaf->nummarksurfaces))
483 mark = leaf->firstmarksurface;
487 // if not visible in current frame, or already marked because it was in another leaf we passed, skip
488 if (surf->lightframe == lightframe)
490 surf->lightframe = lightframe;
491 if (surf->visframe != r_framecount)
493 dist = PlaneDiff(lightorigin, surf->plane);
494 if (surf->flags & SURF_PLANEBACK)
496 // LordHavoc: make sure it is infront of the surface and not too far away
497 if (dist < rd->cullradius && (dist > -0.25f || ((surf->flags & SURF_LIGHTBOTHSIDES) && dist > -rd->cullradius)))
500 int impacts, impactt;
501 float dist2, impact[3];
505 impact[0] = rd->origin[0] - surf->plane->normal[0] * dist;
506 impact[1] = rd->origin[1] - surf->plane->normal[1] * dist;
507 impact[2] = rd->origin[2] - surf->plane->normal[2] * dist;
510 d = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
519 d -= surf->extents[0];
528 d = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
537 d -= surf->extents[1];
548 impacts = DotProduct (impact, surf->texinfo->vecs[0]) + surf->texinfo->vecs[0][3] - surf->texturemins[0];
549 d = bound(0, impacts, surf->extents[0] + 16) - impacts;
554 impactt = DotProduct (impact, surf->texinfo->vecs[1]) + surf->texinfo->vecs[1][3] - surf->texturemins[1];
555 d = bound(0, impactt, surf->extents[1] + 16) - impactt;
562 if (surf->dlightframe != r_framecount) // not dynamic until now
564 surf->dlightbits[0] = surf->dlightbits[1] = surf->dlightbits[2] = surf->dlightbits[3] = surf->dlightbits[4] = surf->dlightbits[5] = surf->dlightbits[6] = surf->dlightbits[7] = 0;
565 surf->dlightframe = r_framecount;
567 surf->dlightbits[bitindex] |= bit;
582 void R_MarkLights(void)
585 for (i = 0;i < r_numdlights;i++)
586 R_VisMarkLights (r_dlight + i, 1 << (i & 31), i >> 5);
590 =============================================================================
594 =============================================================================
597 static int RecursiveLightPoint (vec3_t color, mnode_t *node, float x, float y, float startz, float endz)
599 int side, distz = endz - startz;
604 if (node->contents < 0)
605 return false; // didn't hit anything
607 switch (node->plane->type)
610 node = node->children[x < node->plane->dist];
613 node = node->children[y < node->plane->dist];
616 side = startz < node->plane->dist;
617 if ((endz < node->plane->dist) == side)
619 node = node->children[side];
622 // found an intersection
623 // mid = startz + (endz - startz) * (startz - node->plane->dist) / (startz - endz);
624 // mid = startz + distz * (startz - node->plane->dist) / (-distz);
625 // mid = startz + (-(startz - node->plane->dist));
626 // mid = startz - (startz - node->plane->dist);
627 // mid = startz + node->plane->dist - startz;
628 mid = node->plane->dist;
631 back = front = x * node->plane->normal[0] + y * node->plane->normal[1];
632 front += startz * node->plane->normal[2];
633 back += endz * node->plane->normal[2];
634 side = front < node->plane->dist;
635 if ((back < node->plane->dist) == side)
637 node = node->children[side];
640 // found an intersection
641 // mid = startz + (endz - startz) * ((front - node->plane->dist) / ((front - node->plane->dist) - (back - node->plane->dist)));
642 // mid = startz + (endz - startz) * ((front - node->plane->dist) / (front - back));
643 mid = startz + distz * (front - node->plane->dist) / (front - back);
647 // go down front side
648 if (node->children[side]->contents >= 0 && RecursiveLightPoint (color, node->children[side], x, y, startz, mid))
649 return true; // hit something
652 // check for impact on this node
653 if (node->numsurfaces)
658 surf = cl.worldmodel->surfaces + node->firstsurface;
659 for (i = 0;i < node->numsurfaces;i++, surf++)
661 if (!(surf->flags & SURF_LIGHTMAP))
662 continue; // no lightmaps
664 ds = (int) (x * surf->texinfo->vecs[0][0] + y * surf->texinfo->vecs[0][1] + mid * surf->texinfo->vecs[0][2] + surf->texinfo->vecs[0][3]);
665 dt = (int) (x * surf->texinfo->vecs[1][0] + y * surf->texinfo->vecs[1][1] + mid * surf->texinfo->vecs[1][2] + surf->texinfo->vecs[1][3]);
667 if (ds < surf->texturemins[0] || dt < surf->texturemins[1])
670 ds -= surf->texturemins[0];
671 dt -= surf->texturemins[1];
673 if (ds > surf->extents[0] || dt > surf->extents[1])
679 int maps, line3, size3, dsfrac = ds & 15, dtfrac = dt & 15, scale = 0, r00 = 0, g00 = 0, b00 = 0, r01 = 0, g01 = 0, b01 = 0, r10 = 0, g10 = 0, b10 = 0, r11 = 0, g11 = 0, b11 = 0;
680 line3 = ((surf->extents[0]>>4)+1)*3;
681 size3 = ((surf->extents[0]>>4)+1) * ((surf->extents[1]>>4)+1)*3; // LordHavoc: *3 for colored lighting
683 lightmap = surf->samples + ((dt>>4) * ((surf->extents[0]>>4)+1) + (ds>>4))*3; // LordHavoc: *3 for color
685 for (maps = 0;maps < MAXLIGHTMAPS && surf->styles[maps] != 255;maps++)
687 scale = d_lightstylevalue[surf->styles[maps]];
688 r00 += lightmap[ 0] * scale;g00 += lightmap[ 1] * scale;b00 += lightmap[ 2] * scale;
689 r01 += lightmap[ 3] * scale;g01 += lightmap[ 4] * scale;b01 += lightmap[ 5] * scale;
690 r10 += lightmap[line3+0] * scale;g10 += lightmap[line3+1] * scale;b10 += lightmap[line3+2] * scale;
691 r11 += lightmap[line3+3] * scale;g11 += lightmap[line3+4] * scale;b11 += lightmap[line3+5] * scale;
696 // LordHavoc: here's the readable version of the interpolation
697 // code, not quite as easy for the compiler to optimize...
699 // dsfrac is the X position in the lightmap pixel, * 16
700 // dtfrac is the Y position in the lightmap pixel, * 16
701 // r00 is top left corner, r01 is top right corner
702 // r10 is bottom left corner, r11 is bottom right corner
703 // g and b are the same layout.
704 // r0 and r1 are the top and bottom intermediate results
706 // first we interpolate the top two points, to get the top
708 r0 = (((r01-r00) * dsfrac) >> 4) + r00;
709 g0 = (((g01-g00) * dsfrac) >> 4) + g00;
710 b0 = (((b01-b00) * dsfrac) >> 4) + b00;
711 // then we interpolate the bottom two points, to get the
712 // bottom edge sample
713 r1 = (((r11-r10) * dsfrac) >> 4) + r10;
714 g1 = (((g11-g10) * dsfrac) >> 4) + g10;
715 b1 = (((b11-b10) * dsfrac) >> 4) + b10;
716 // then we interpolate the top and bottom samples to get the
717 // middle sample (the one which was requested)
718 r = (((r1-r0) * dtfrac) >> 4) + r0;
719 g = (((g1-g0) * dtfrac) >> 4) + g0;
720 b = (((b1-b0) * dtfrac) >> 4) + b0;
723 color[0] += (float) ((((((((r11-r10) * dsfrac) >> 4) + r10)-((((r01-r00) * dsfrac) >> 4) + r00)) * dtfrac) >> 4) + ((((r01-r00) * dsfrac) >> 4) + r00)) * (1.0f / 32768.0f);
724 color[1] += (float) ((((((((g11-g10) * dsfrac) >> 4) + g10)-((((g01-g00) * dsfrac) >> 4) + g00)) * dtfrac) >> 4) + ((((g01-g00) * dsfrac) >> 4) + g00)) * (1.0f / 32768.0f);
725 color[2] += (float) ((((((((b11-b10) * dsfrac) >> 4) + b10)-((((b01-b00) * dsfrac) >> 4) + b00)) * dtfrac) >> 4) + ((((b01-b00) * dsfrac) >> 4) + b00)) * (1.0f / 32768.0f);
727 return true; // success
732 node = node->children[side ^ 1];
734 distz = endz - startz;
736 // return RecursiveLightPoint (color, node->children[side ^ 1], x, y, mid, endz);
740 void R_CompleteLightPoint (vec3_t color, vec3_t p, int dynamic, mleaf_t *leaf)
747 leaf = Mod_PointInLeaf(p, cl.worldmodel);
749 if (leaf->contents == CONTENTS_SOLID)
751 color[0] = color[1] = color[2] = 0;
755 if (r_fullbright.integer || !cl.worldmodel->lightdata)
757 color[0] = color[1] = color[2] = 2;
761 color[0] = color[1] = color[2] = r_ambient.value * (2.0f / 128.0f);
762 RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
764 if (dynamic && leaf->dlightframe == r_framecount)
766 dlightbits = leaf->dlightbits;
767 for (i = 0;i < r_numdlights;i++)
769 if (!(dlightbits[i >> 5] & (1 << (i & 31))))
772 VectorSubtract (p, rd->origin, dist);
773 f = DotProduct(dist, dist) + LIGHTOFFSET;
774 if (f < rd->cullradius2)
776 f = (1.0f / f) - rd->lightsubtract;
778 VectorMA(color, f, rd->light, color);
784 void R_ModelLightPoint (vec3_t color, vec3_t p, int *dlightbits)
787 leaf = Mod_PointInLeaf(p, cl.worldmodel);
788 if (leaf->contents == CONTENTS_SOLID)
790 color[0] = color[1] = color[2] = 0;
791 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
795 if (r_fullbright.integer || !cl.worldmodel->lightdata)
797 color[0] = color[1] = color[2] = 2;
798 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
802 color[0] = color[1] = color[2] = r_ambient.value * (2.0f / 128.0f);
803 RecursiveLightPoint (color, cl.worldmodel->nodes, p[0], p[1], p[2], p[2] - 65536);
805 if (leaf->dlightframe == r_framecount)
807 dlightbits[0] = leaf->dlightbits[0];
808 dlightbits[1] = leaf->dlightbits[1];
809 dlightbits[2] = leaf->dlightbits[2];
810 dlightbits[3] = leaf->dlightbits[3];
811 dlightbits[4] = leaf->dlightbits[4];
812 dlightbits[5] = leaf->dlightbits[5];
813 dlightbits[6] = leaf->dlightbits[6];
814 dlightbits[7] = leaf->dlightbits[7];
817 dlightbits[0] = dlightbits[1] = dlightbits[2] = dlightbits[3] = dlightbits[4] = dlightbits[5] = dlightbits[6] = dlightbits[7] = 0;
820 void R_LightModel(int numverts)
822 int i, j, nearlights = 0;
823 float color[3], basecolor[3], v[3], t, *av, *avn, *avc, a, number, f, hardness, hardnessoffset, dist2;
831 nearlight[MAX_DLIGHTS], *nl;
832 int modeldlightbits[8];
834 a = currentrenderentity->alpha;
835 if (currentrenderentity->effects & EF_FULLBRIGHT)
836 basecolor[0] = basecolor[1] = basecolor[2] = 1;
839 if (r_lightmodels.integer)
841 R_ModelLightPoint(basecolor, currentrenderentity->origin, modeldlightbits);
845 // this code is unused for now
846 for (i = 0, sl = staticlight;i < staticlights && nearlights < MAX_DLIGHTS;i++, sl++)
848 if (TraceLine(currentrenderentity->origin, sl->origin, NULL, NULL, 0) == 1)
850 nl->fadetype = sl->fadetype;
851 nl->distancescale = sl->distancescale;
852 nl->radius = sl->radius;
853 VectorCopy(sl->origin, nl->origin);
854 VectorCopy(sl->color, nl->light);
855 nl->cullradius2 = 99999999;
856 nl->lightsubtract = 0;
862 for (i = 0;i < r_numdlights && nearlights < MAX_DLIGHTS;i++)
864 if (!(modeldlightbits[i >> 5] & (1 << (i & 31))))
866 if (currentrenderentity == r_dlight[i].ent)
868 f = (1.0f / LIGHTOFFSET) - nl->lightsubtract;
870 VectorMA(basecolor, f, r_dlight[i].light, basecolor);
874 // convert 0-255 radius coloring to 0-1, while also amplifying the brightness by 16
875 //if (TraceLine(currentrenderentity->origin, r_dlight[i].origin, NULL, NULL, 0) == 1)
877 // transform the light into the model's coordinate system
878 //if (gl_transform.integer)
879 // softwareuntransform(r_dlight[i].origin, nl->origin);
881 VectorCopy(r_dlight[i].origin, nl->origin);
882 nl->cullradius2 = r_dlight[i].cullradius2;
883 VectorCopy(r_dlight[i].light, nl->light);
884 nl->lightsubtract = r_dlight[i].lightsubtract;
892 R_CompleteLightPoint (basecolor, currentrenderentity->origin, true, NULL);
894 avc = aliasvertcolor;
899 hardness = r_lightmodelhardness.value;
900 hardnessoffset = (1.0f - hardness);
901 for (i = 0;i < numverts;i++)
903 VectorCopy(basecolor, color);
904 for (j = 0, nl = &nearlight[0];j < nearlights;j++, nl++)
906 // distance attenuation
907 VectorSubtract(nl->origin, av, v);
908 dist2 = DotProduct(v,v);
909 if (dist2 < nl->cullradius2)
911 f = (1.0f / (dist2 + LIGHTOFFSET)) - nl->lightsubtract;
914 // directional shading
916 t = 1.0f / sqrt(dist2);
918 number = DotProduct(v, v);
919 *((long *)&t) = 0x5f3759df - ((* (long *) &number) >> 1);
920 t = t * (1.5f - (number * 0.5f * t * t));
922 // DotProduct(avn,v) * t is dotproduct with a normalized v,
923 // the hardness variables are for backlighting/shinyness
924 f *= DotProduct(avn,v) * t * hardness + hardnessoffset;
926 VectorMA(color, f, nl->light, color);
931 VectorCopy(color, avc);
940 for (i = 0;i < numverts;i++)
942 VectorCopy(basecolor, avc);