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- /*
- Copyright (C) 1997-2001 Id Software, Inc.
-
- This program is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation; either version 2
- of the License, or (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-
- See the GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- */
- // r_light.c
-
- #include "r_local.h"
-
- int r_dlightframecount;
-
- // #define DLIGHT_CUTOFF 64
- #define DLIGHT_CUTOFF 0
-
- /*
- =============================================================================
-
- DYNAMIC LIGHTS BLEND RENDERING
-
- =============================================================================
- */
-
- void R_RenderDlight (dlight_t *light)
- {
- int i, j;
- float a;
- vec3_t v;
- float rad;
-
- rad = light->intensity * 0.35;
-
- VectorSubtract (light->origin, r_origin, v);
- #if 0
- // FIXME?
- if (VectorLength (v) < rad)
- { // view is inside the dlight
- V_AddBlend (light->color[0], light->color[1], light->color[2], light->intensity * 0.0003, v_blend);
- return;
- }
- #endif
-
- qglBegin (GL_TRIANGLE_FAN);
- qglColor3f (light->color[0]*0.2, light->color[1]*0.2, light->color[2]*0.2);
- for (i=0 ; i<3 ; i++)
- v[i] = light->origin[i] - vpn[i]*rad;
- qglVertex3fv (v);
- qglColor3f (0,0,0);
- for (i=16 ; i>=0 ; i--)
- {
- a = i/16.0 * M_PI*2;
- for (j=0 ; j<3 ; j++)
- v[j] = light->origin[j] + vright[j]*cos(a)*rad
- + vup[j]*sin(a)*rad;
- qglVertex3fv (v);
- }
- qglEnd ();
- }
-
- /*
- =============
- R_RenderDlights
- =============
- */
- void R_RenderDlights (void)
- {
- int i;
- dlight_t *l;
-
- if (!gl_flashblend->value)
- return;
-
- r_dlightframecount = r_framecount + 1; // because the count hasn't
- // advanced yet for this frame
- qglDepthMask (0);
- qglDisable (GL_TEXTURE_2D);
- qglShadeModel (GL_SMOOTH);
- qglEnable (GL_BLEND);
- qglBlendFunc (GL_ONE, GL_ONE);
-
- l = r_newrefdef.dlights;
- for (i=0 ; i<r_newrefdef.num_dlights ; i++, l++)
- R_RenderDlight (l);
-
- qglColor3f (1,1,1);
- qglDisable (GL_BLEND);
- qglEnable (GL_TEXTURE_2D);
- qglBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
- qglDepthMask (1);
- }
-
-
- /*
- =============================================================================
-
- DYNAMIC LIGHTS
-
- =============================================================================
- */
-
- /*
- =============
- R_MarkLights
- =============
- */
- void R_MarkLights (dlight_t *light, int bit, mnode_t *node)
- {
- cplane_t *splitplane;
- float dist;
- msurface_t *surf;
- int i;
-
- if (node->contents != -1)
- return;
-
- splitplane = node->plane;
- dist = DotProduct (light->origin, splitplane->normal) - splitplane->dist;
-
- if (dist > light->intensity-DLIGHT_CUTOFF)
- {
- R_MarkLights (light, bit, node->children[0]);
- return;
- }
- if (dist < -light->intensity+DLIGHT_CUTOFF)
- {
- R_MarkLights (light, bit, node->children[1]);
- return;
- }
-
- // mark the polygons
- surf = r_worldmodel->surfaces + node->firstsurface;
- for (i=0 ; i<node->numsurfaces ; i++, surf++)
- {
- if (surf->dlightframe != r_dlightframecount)
- {
- surf->dlightbits = 0;
- surf->dlightframe = r_dlightframecount;
- }
- surf->dlightbits |= bit;
- }
-
- R_MarkLights (light, bit, node->children[0]);
- R_MarkLights (light, bit, node->children[1]);
- }
-
-
- /*
- =============
- R_PushDlights
- =============
- */
- void R_PushDlights (void)
- {
- int i;
- dlight_t *l;
-
- if (gl_flashblend->value)
- return;
-
- r_dlightframecount = r_framecount + 1; // because the count hasn't
- // advanced yet for this frame
- l = r_newrefdef.dlights;
- for (i=0 ; i<r_newrefdef.num_dlights ; i++, l++)
- R_MarkLights ( l, 1<<i, r_worldmodel->nodes );
- }
-
- /*
- =============
- R_PushDlightsForBModel
- =============
- */
- void R_PushDlightsForBModel (entity_t *e)
- {
- int k;
- dlight_t *lt;
-
- lt = r_newrefdef.dlights;
-
- if (e->angles[0] || e->angles[1] || e->angles[2])
- {
- vec3_t temp;
- vec3_t forward, right, up;
-
- AngleVectors (e->angles, forward, right, up);
-
- for (k=0 ; k<r_newrefdef.num_dlights ; k++, lt++)
- {
- VectorSubtract (lt->origin, e->origin, temp);
- lt->origin[0] = DotProduct (temp, forward);
- lt->origin[1] = -DotProduct (temp, right);
- lt->origin[2] = DotProduct (temp, up);
- R_MarkLights (lt, 1<<k, e->model->nodes + e->model->firstnode);
- VectorAdd (temp, e->origin, lt->origin);
- }
- }
- else
- {
- for (k=0 ; k<r_newrefdef.num_dlights ; k++, lt++)
- {
- VectorSubtract (lt->origin, e->origin, lt->origin);
- R_MarkLights (lt, 1<<k, e->model->nodes + e->model->firstnode);
- VectorAdd (lt->origin, e->origin, lt->origin);
- }
- }
- }
-
- /*
- =============================================================================
-
- LIGHT SAMPLING
-
- =============================================================================
- */
-
- vec3_t pointcolor;
- cplane_t *lightplane; // used as shadow plane
- vec3_t lightspot;
-
- int RecursiveLightPoint (mnode_t *node, vec3_t start, vec3_t end)
- {
- float front, back, frac;
- int side;
- cplane_t *plane;
- vec3_t mid;
- msurface_t *surf;
- int s, t, ds, dt;
- int i;
- mtexinfo_t *tex;
- byte *lightmap;
- int maps;
- int r;
- vec3_t scale;
-
- if (node->contents != -1)
- return -1; // didn't hit anything
-
- // calculate mid point
-
- // FIXME: optimize for axial
- plane = node->plane;
- front = DotProduct (start, plane->normal) - plane->dist;
- back = DotProduct (end, plane->normal) - plane->dist;
- side = front < 0;
-
- if ( (back < 0) == side)
- return RecursiveLightPoint (node->children[side], start, end);
-
- frac = front / (front-back);
- mid[0] = start[0] + (end[0] - start[0])*frac;
- mid[1] = start[1] + (end[1] - start[1])*frac;
- mid[2] = start[2] + (end[2] - start[2])*frac;
-
- // go down front side
- r = RecursiveLightPoint (node->children[side], start, mid);
- if (r >= 0)
- return r; // hit something
-
- if ( (back < 0) == side )
- return -1; // didn't hit anuthing
-
- // check for impact on this node
- VectorCopy (mid, lightspot);
- lightplane = plane;
-
- surf = r_worldmodel->surfaces + node->firstsurface;
- for (i=0 ; i<node->numsurfaces ; i++, surf++)
- {
- tex = surf->texinfo;
-
- if (tex->flags & (SURF_WARP|SURF_SKY))
- continue; // no lightmaps
-
- s = DotProduct (mid, tex->vecs[0]) + tex->vecs[0][3];
- if (s < surf->texturemins[0])
- continue;
-
- t = DotProduct (mid, tex->vecs[1]) + tex->vecs[1][3];
- if (t < surf->texturemins[1])
- continue;
-
- ds = s - surf->texturemins[0];
- dt = t - surf->texturemins[1];
-
- if ( ds > surf->extents[0] || dt > surf->extents[1] )
- continue;
-
- lightmap = surf->samples;
- if (!surf->samples)
- return 0;
-
- ds >>= 4;
- dt >>= 4;
-
- VectorClear (pointcolor);
-
- lightmap += 3*(dt * ((surf->extents[0]>>4)+1) + ds);
-
- for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ; maps++)
- {
- for (i=0 ; i<3 ; i++)
- scale[i] = gl_modulate->value*r_newrefdef.lightstyles[surf->styles[maps]].rgb[i];
-
- pointcolor[0] += lightmap[0] * scale[0] * (1.0/255);
- pointcolor[1] += lightmap[1] * scale[1] * (1.0/255);
- pointcolor[2] += lightmap[2] * scale[2] * (1.0/255);
- lightmap += 3*((surf->extents[0]>>4)+1) *
- ((surf->extents[1]>>4)+1);
- }
-
- return 1;
- }
-
- // go down back side
- return RecursiveLightPoint (node->children[!side], mid, end);
- }
-
- /*
- ===============
- R_LightPoint
- ===============
- */
- void R_LightPoint (vec3_t p, vec3_t color)
- {
- vec3_t end;
- float r;
- int lnum;
- dlight_t *dl;
- float light;
- vec3_t dist, dlightcolor;
- float add;
-
- if (!r_worldmodel->lightdata)
- {
- color[0] = color[1] = color[2] = 1.0;
- return;
- }
-
- end[0] = p[0];
- end[1] = p[1];
- end[2] = p[2] - 2048;
-
- r = RecursiveLightPoint (r_worldmodel->nodes, p, end);
-
- if (r == -1)
- {
- VectorCopy (vec3_origin, color);
- }
- else
- {
- VectorCopy (pointcolor, color);
- }
-
- //
- // add dynamic lights
- //
- light = 0;
- dl = r_newrefdef.dlights;
- VectorClear ( dlightcolor );
- for (lnum=0 ; lnum<r_newrefdef.num_dlights ; lnum++, dl++)
- {
- VectorSubtract (currententity->origin,
- dl->origin,
- dist);
- add = dl->intensity - VectorLength(dist);
- if (add > 0)
- {
- add *= (1.0/256);
- VectorMA (dlightcolor, add, dl->color, dlightcolor);
- }
- }
-
- VectorMA (color, gl_modulate->value, dlightcolor, color);
- }
-
-
- //===================================================================
-
- /*
- =============
- R_AddStainMap
- =============
- */
- void R_AddStainMap (stain_t *st, msurface_t *surf)
- {
- int i;
- mtexinfo_t *tex;
- int sd, td;
- float fsacc, ftacc;
- float dist, fdist, frad, fminlight;
- vec3_t impact, local;
- int s, t, smax, tmax;
- byte *pfBL;
-
- if (!surf->stainsamples)
- return;
- tex = surf->texinfo;
- if ( (tex->flags & (SURF_SKY|SURF_TRANS33|SURF_TRANS66|SURF_WARP) ) )
- return;
-
- if ( surf->plane->type < 3 ) {
- dist = st->origin[surf->plane->type] - surf->plane->dist;
- } else {
- dist = DotProduct (st->origin, surf->plane->normal) - surf->plane->dist;
- }
-
- if (surf->flags & SURF_PLANEBACK)
- fdist = -dist;
- else
- fdist = dist;
-
- frad = st->intensity - fabs (fdist);
- if (frad < 0)
- return;
-
- smax = (surf->extents[0]>>4)+1;
- tmax = (surf->extents[1]>>4)+1;
-
- fminlight = frad;
-
- for (i = 0 ; i<3 ; i++)
- impact[i] = st->origin[i] - surf->plane->normal[i] * fdist;
-
- local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3] - surf->texturemins[0];
- local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3] - surf->texturemins[1];
-
- pfBL = surf->stainsamples;
- surf->cached_light[0] = 0;
-
- for (t = 0, ftacc = 0 ; t<tmax ; t++, ftacc += 16)
- {
- td = local[1] - ftacc;
- if ( td < 0 )
- td = -td;
- for ( s=0, fsacc = 0 ; s<smax ; s++, fsacc += 16, pfBL += 3)
- {
- sd = Q_ftol( local[0] - fsacc );
-
- if ( sd < 0 )
- sd = -sd;
-
- if (sd > td)
- fdist = sd + (td>>1);
- else
- fdist = td + (sd>>1);
-
- if ( fdist < fminlight )
- {
- float alpha, mult;
- int test;
-
- mult = frad / fdist;
- if (mult > 5.0)
- mult = 5.0;
-
- alpha = st->alpha * mult;
- if (alpha > 255)
- alpha = 255;
- if (alpha > st->alpha)
- alpha = st->alpha;
- if (alpha < 0)
- alpha = 0;
- alpha *= (1.0 / 255.0);
-
- for (i=0;i<3;i++)
- {
- test = Q_ftol( (1-alpha) * (float)pfBL[i] + alpha * st->color[i] );
-
- if (test > 255)
- pfBL[i] = 255;
- else if (test < 0)
- pfBL[i] = 0;
- else
- pfBL[i] = (byte)(test);
- }
- }
- }
- }
- }
-
- /*
- =============
- R_StainNode
- =============
- */
- void R_StainNode (stain_t *st, mnode_t *node)
- {
- int c;
- float dist;
- msurface_t *surf;
-
- if (node->contents != -1)
- return;
-
- if ( node->plane->type < 3 ) {
- dist = st->origin[node->plane->type] - node->plane->dist;
- } else {
- dist = DotProduct (st->origin, node->plane->normal) - node->plane->dist;
- }
-
- if (dist > st->intensity)
- {
- R_StainNode (st, node->children[0]);
- return;
- }
-
- if (dist < -st->intensity)
- {
- R_StainNode (st, node->children[1]);
- return;
- }
-
- for (c = node->numsurfaces, surf = r_worldmodel->surfaces + node->firstsurface; c ; c--, surf++)
- {
- R_AddStainMap ( st, surf );
- }
-
- if (node->contents == -1)
- R_StainNode (st, node->children[0]);
- if (node->contents == -1)
- R_StainNode (st, node->children[1]);
- }
-
- /*
- =============
- R_PushStains
- =============
- */
- void R_PushStains (void)
- {
- int i;
- stain_t *st;
-
- st = r_newrefdef.stains;
- for (i=0 ; i<r_newrefdef.num_stains ; i++, st++) {
- R_StainNode ( st, r_worldmodel->nodes );
- }
- }
-
- /*
- =============
- R_PushStainsForBModel
- =============
- */
- void R_PushStainsForBModel (entity_t *e)
- {
- int i, c;
- stain_t *st;
- model_t *model;
- msurface_t *surf;
-
- st = r_newrefdef.stains;
- model = e->model;
-
- if (e->angles[0] || e->angles[1] || e->angles[2])
- {
- vec3_t temp;
- vec3_t forward, right, up;
-
- AngleVectors ( e->angles, forward, right, up );
-
- for (i=0 ; i<r_newrefdef.num_stains ; i++, st++) {
- VectorSubtract (st->origin, e->origin, temp);
- st->origin[0] = DotProduct (temp, forward);
- st->origin[1] = -DotProduct (temp, right);
- st->origin[2] = DotProduct (temp, up);
-
- surf = &model->surfaces[model->firstmodelsurface];
- for (c=0 ; c<model->nummodelsurfaces ; c++, surf++)
- {
- R_AddStainMap ( st, surf );
- }
-
- VectorAdd ( temp, e->origin, st->origin );
- }
- }
- else
- {
- for (i=0 ; i<r_newrefdef.num_stains ; i++, st++) {
- VectorSubtract (st->origin, e->origin, st->origin);
-
- surf = &model->surfaces[model->firstmodelsurface];
- for (c=0 ; c<model->nummodelsurfaces ; c++, surf++)
- {
- R_AddStainMap ( st, surf );
- }
-
- VectorAdd ( st->origin, e->origin, st->origin );
- }
- }
- }
-
- //===================================================================
-
- static float s_blocklights[34*34*3];
-
- /*
- ===============
- R_AddStainMaps
- ===============
- */
- void R_AddStainMaps (msurface_t *surf)
- {
- int s, t, i;
- int smax, tmax;
- float *pfBL;
- byte *pfBS;
- float scale;
-
- scale = gl_modulate->value;
-
- smax = (surf->extents[0]>>4)+1;
- tmax = (surf->extents[1]>>4)+1;
-
- pfBL = s_blocklights;
- pfBS = surf->stainsamples;
-
- for (t = 0; t<tmax; t++)
- for ( s=0; s<smax; s++, pfBL += 3, pfBS +=3)
- for (i=0;i<3;i++)
- {
- if (pfBL[i] > pfBS[i]*scale)
- pfBL[i] = pfBS[i]*scale;
- }
- }
-
- /*
- ===============
- R_AddDynamicLights
- ===============
- */
- void R_AddDynamicLights (msurface_t *surf)
- {
- int lnum;
- int sd, td;
- float fdist, frad, fminlight;
- vec3_t impact, local, dlorigin;
- int s, t;
- int i;
- int smax, tmax;
- mtexinfo_t *tex;
- dlight_t *dl;
- float *pfBL;
- float fsacc, ftacc;
- qboolean rotated = false;
- vec3_t temp;
- vec3_t forward, right, up;
-
- smax = (surf->extents[0]>>4)+1;
- tmax = (surf->extents[1]>>4)+1;
- tex = surf->texinfo;
-
- if (currententity->angles[0] || currententity->angles[1] || currententity->angles[2])
- {
- rotated = true;
- AngleVectors (currententity->angles, forward, right, up);
- }
-
- dl = r_newrefdef.dlights;
- for (lnum=0 ; lnum<r_newrefdef.num_dlights ; lnum++, dl++)
- {
- if ( !(surf->dlightbits & (1<<lnum) ) )
- continue; // not lit by this light
-
- frad = dl->intensity;
- VectorCopy ( dl->origin, dlorigin );
-
- VectorSubtract (dlorigin, currententity->origin, dlorigin);
- if (rotated)
- {
- VectorCopy (dlorigin, temp);
- dlorigin[0] = DotProduct (temp, forward);
- dlorigin[1] = -DotProduct (temp, right);
- dlorigin[2] = DotProduct (temp, up);
- }
-
- fdist = DotProduct (dlorigin, surf->plane->normal) - surf->plane->dist;
- frad -= fabs(fdist);
- // rad is now the highest intensity on the plane
-
- fminlight = DLIGHT_CUTOFF; // FIXME: make configurable?
- if (frad < fminlight)
- continue;
- fminlight = frad - fminlight;
-
- for (i=0 ; i<3 ; i++)
- {
- impact[i] = dlorigin[i] -
- surf->plane->normal[i]*fdist;
- }
-
- local[0] = DotProduct (impact, tex->vecs[0]) + tex->vecs[0][3] - surf->texturemins[0];
- local[1] = DotProduct (impact, tex->vecs[1]) + tex->vecs[1][3] - surf->texturemins[1];
-
- pfBL = s_blocklights;
- for (t = 0, ftacc = 0 ; t<tmax ; t++, ftacc += 16)
- {
- td = local[1] - ftacc;
- if ( td < 0 )
- td = -td;
-
- for ( s=0, fsacc = 0 ; s<smax ; s++, fsacc += 16, pfBL += 3)
- {
- sd = Q_ftol( local[0] - fsacc );
-
- if ( sd < 0 )
- sd = -sd;
-
- if (sd > td)
- fdist = sd + (td>>1);
- else
- fdist = td + (sd>>1);
-
- if ( fdist < fminlight )
- {
- pfBL[0] += ( fminlight - fdist ) * dl->color[0];
- pfBL[1] += ( fminlight - fdist ) * dl->color[1];
- pfBL[2] += ( fminlight - fdist ) * dl->color[2];
- }
- }
- }
- }
- }
-
-
- /*
- ** R_SetCacheState
- */
- void R_SetCacheState( msurface_t *surf )
- {
- int maps;
-
- for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
- maps++)
- {
- surf->cached_light[maps] = r_newrefdef.lightstyles[surf->styles[maps]].white;
- }
- }
-
- /*
- ===============
- R_BuildLightMap
-
- Combine and scale multiple lightmaps into the floating format in blocklights
- ===============
- */
- void R_BuildLightMap (msurface_t *surf, byte *dest, int stride)
- {
- int smax, tmax;
- int r, g, b, a, max;
- int i, j, size;
- byte *lightmap;
- float scale[4];
- int nummaps;
- float *bl;
- lightstyle_t *style;
- int monolightmap;
-
- if ( SurfaceHasNoLightmap( surf ) )
- Com_Error (ERR_DROP, "R_BuildLightMap called for non-lit surface");
-
- smax = (surf->extents[0]>>4)+1;
- tmax = (surf->extents[1]>>4)+1;
- size = smax*tmax;
- if (size > (sizeof(s_blocklights)>>4) )
- Com_Error (ERR_DROP, "Bad s_blocklights size");
-
- // set to full bright if no light data
- if (!surf->samples)
- {
- int maps;
-
- for (i=0 ; i<size*3 ; i++)
- s_blocklights[i] = 255;
- for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
- maps++)
- {
- style = &r_newrefdef.lightstyles[surf->styles[maps]];
- }
- goto store;
- }
-
- // count the # of maps
- for ( nummaps = 0 ; nummaps < MAXLIGHTMAPS && surf->styles[nummaps] != 255 ;
- nummaps++)
- ;
-
- lightmap = surf->samples;
-
- // add all the lightmaps
- if ( nummaps == 1 )
- {
- int maps;
-
- for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
- maps++)
- {
- bl = s_blocklights;
-
- for (i=0 ; i<3 ; i++)
- scale[i] = gl_modulate->value*r_newrefdef.lightstyles[surf->styles[maps]].rgb[i];
-
- if ( scale[0] == 1.0F &&
- scale[1] == 1.0F &&
- scale[2] == 1.0F )
- {
- for (i=0 ; i<size ; i++, bl+=3)
- {
- bl[0] = lightmap[i*3+0];
- bl[1] = lightmap[i*3+1];
- bl[2] = lightmap[i*3+2];
- }
- }
- else
- {
- for (i=0 ; i<size ; i++, bl+=3)
- {
- bl[0] = lightmap[i*3+0] * scale[0];
- bl[1] = lightmap[i*3+1] * scale[1];
- bl[2] = lightmap[i*3+2] * scale[2];
- }
- }
- lightmap += size*3; // skip to next lightmap
- }
- }
- else
- {
- int maps;
-
- memset( s_blocklights, 0, sizeof( s_blocklights[0] ) * size * 3 );
-
- for (maps = 0 ; maps < MAXLIGHTMAPS && surf->styles[maps] != 255 ;
- maps++)
- {
- bl = s_blocklights;
-
- for (i=0 ; i<3 ; i++)
- scale[i] = gl_modulate->value*r_newrefdef.lightstyles[surf->styles[maps]].rgb[i];
-
- if ( scale[0] == 1.0F &&
- scale[1] == 1.0F &&
- scale[2] == 1.0F )
- {
- for (i=0 ; i<size ; i++, bl+=3 )
- {
- bl[0] += lightmap[i*3+0];
- bl[1] += lightmap[i*3+1];
- bl[2] += lightmap[i*3+2];
- }
- }
- else
- {
- for (i=0 ; i<size ; i++, bl+=3)
- {
- bl[0] += lightmap[i*3+0] * scale[0];
- bl[1] += lightmap[i*3+1] * scale[1];
- bl[2] += lightmap[i*3+2] * scale[2];
- }
- }
- lightmap += size*3; // skip to next lightmap
- }
- }
-
- // add all the dynamic lights
- if (surf->dlightframe == r_framecount)
- R_AddDynamicLights (surf);
-
- if (surf->stainsamples)
- R_AddStainMaps (surf);
-
- // put into texture format
- store:
- stride -= (smax<<2);
- bl = s_blocklights;
-
- monolightmap = gl_monolightmap->string[0];
-
- if ( monolightmap == '0' )
- {
- for (i=0 ; i<tmax ; i++, dest += stride)
- {
- for (j=0 ; j<smax ; j++)
- {
- r = Q_ftol( bl[0] );
- g = Q_ftol( bl[1] );
- b = Q_ftol( bl[2] );
-
- // catch negative lights
- if (r < 0)
- r = 0;
- if (g < 0)
- g = 0;
- if (b < 0)
- b = 0;
-
- /*
- ** determine the brightest of the three color components
- */
- if (r > g)
- max = r;
- else
- max = g;
- if (b > max)
- max = b;
-
- /*
- ** alpha is ONLY used for the mono lightmap case. For this reason
- ** we set it to the brightest of the color components so that
- ** things don't get too dim.
- */
- a = max;
-
- /*
- ** rescale all the color components if the intensity of the greatest
- ** channel exceeds 1.0
- */
- if (max > 255)
- {
- float t = 255.0F / max;
-
- r = r*t;
- g = g*t;
- b = b*t;
- a = a*t;
- }
-
- dest[0] = r;
- dest[1] = g;
- dest[2] = b;
- dest[3] = a;
-
- bl += 3;
- dest += 4;
- }
- }
- }
- else
- {
- for (i=0 ; i<tmax ; i++, dest += stride)
- {
- for (j=0 ; j<smax ; j++)
- {
-
- r = Q_ftol( bl[0] );
- g = Q_ftol( bl[1] );
- b = Q_ftol( bl[2] );
-
- // catch negative lights
- if (r < 0)
- r = 0;
- if (g < 0)
- g = 0;
- if (b < 0)
- b = 0;
-
- /*
- ** determine the brightest of the three color components
- */
- if (r > g)
- max = r;
- else
- max = g;
- if (b > max)
- max = b;
-
- /*
- ** alpha is ONLY used for the mono lightmap case. For this reason
- ** we set it to the brightest of the color components so that
- ** things don't get too dim.
- */
- a = max;
-
- /*
- ** rescale all the color components if the intensity of the greatest
- ** channel exceeds 1.0
- */
- if (max > 255)
- {
- float t = 255.0F / max;
-
- r = r*t;
- g = g*t;
- b = b*t;
- a = a*t;
- }
-
- /*
- ** So if we are doing alpha lightmaps we need to set the R, G, and B
- ** components to 0 and we need to set alpha to 1-alpha.
- */
- switch ( monolightmap )
- {
- case 'L':
- case 'I':
- r = a;
- g = b = 0;
- break;
- case 'C':
- // try faking colored lighting
- a = 255 - ((r+g+b)/3);
- r *= a/255.0;
- g *= a/255.0;
- b *= a/255.0;
- break;
- case 'A':
- default:
- r = g = b = 0;
- a = 255 - a;
- break;
- }
-
- dest[0] = r;
- dest[1] = g;
- dest[2] = b;
- dest[3] = a;
-
- bl += 3;
- dest += 4;
- }
- }
- }
- }
-
-