/*
============
LightFace
============
*/
void LightFace (int surfnum)
{
dface_t *f;
lightinfo_t l;
int s, t;
int i,j,c;
vec3_t total;
int size;
int lightmapwidth, lightmapsize;
byte *out;
vec3_t *light;
int w, h;
int clamp = 192;
float clampfactor = 0.75;
if ( !clamp192 )
{
clamp = 255;
clampfactor = 1.0;
}
f = dfaces + surfnum;
//
// some surfaces don't need lightmaps
//
f->lightofs = -1;
for (j=0 ; j<MAXLIGHTMAPS ; j++)
f->styles[j] = 255;
if ( texinfo[f->texinfo].flags & TEX_SPECIAL)
{ // non-lit texture
return;
}
memset (&l, 0, sizeof(l));
l.surfnum = surfnum;
l.face = f;
//
// rotate plane
//
VectorCopy (dplanes[f->planenum].normal, l.facenormal);
l.facedist = dplanes[f->planenum].dist;
if (f->side)
{
VectorSubtract (vec3_origin, l.facenormal, l.facenormal);
l.facedist = -l.facedist;
}
CalcFaceVectors (&l);
CalcFaceExtents (&l);
CalcPoints (&l);
lightmapwidth = l.texsize[0]+1;
size = lightmapwidth*(l.texsize[1]+1);
if (size > SINGLEMAP)
Error ("Bad lightmap size");
for (i=0 ; i<MAXLIGHTMAPS ; i++)
l.lightstyles[i] = 255;
//
// cast all lights
//
l.numlightstyles = 0;
for (i=0 ; i<numlightentities ; i++)
SingleLightFace (&lightentities[i], &l);
FixMinlight (&l);
if (!l.numlightstyles)
{ // no light hitting it
return;
}
//
// save out the values
//
for (i=0 ; i <MAXLIGHTMAPS ; i++)
f->styles[i] = l.lightstyles[i];
if( hicolor )
lightmapsize = size*l.numlightstyles*3;
else
lightmapsize = size * l.numlightstyles;
out = GetFileSpace (lightmapsize);
f->lightofs = out - filebase;
// extra filtering
h = (l.texsize[1]+1)*2;
w = (l.texsize[0]+1)*2;
for (i=0 ; i< l.numlightstyles ; i++)
{
if (l.lightstyles[i] == 0xff)
Error ("Wrote empty lightmap");
light = l.lightmaps[i];
c = 0;
for (t=0 ; t<=l.texsize[1] ; t++)
{
for (s=0 ; s<=l.texsize[0] ; s++, c++)
{
if (extrasamples)
{
#ifdef OLD_CODE
// filtered sample
VectorCopy( light[t*2*w+s*2], total );
VectorAdd( total, light[t*2*w+s*2+1], total );
VectorAdd( total, light[(t*2+1)*w+s*2], total );
VectorAdd( total, light[(t*2+1)*w+s*2+1], total );
VectorScale( total, 0.25, total );
#else
int u, v;
float weight[3][3] =
{
{ 5, 9, 5 },
{ 9, 16, 9 },
{ 5, 9, 5 },
};
float divisor = 0.0;
VectorFill(total,0);
for ( u = 0; u < 3; u++ )
{
for ( v = 0; v < 3; v++ )
{
if ( s+u-2>=0 && t+v-1>=0 && s+u-1 <= w && t+v-1 <= h)
{
vec3_t sample;
VectorScale( light[((t*2)+(v-1))*w + ((s*2)+(u-1))], weight[u][v], sample );
divisor += weight[u][v];
VectorAdd( total, sample, total );
}
}
}
#endif
if ( divisor > 1.0 )
VectorScale( total, 1/divisor, total );
total[0] = max(total[0],0.0);
total[1] = max(total[1],0.0);
total[2] = max(total[2],0.0);
}
else
VectorCopy( light[ c ], total );
// Scale
VectorScale( total, rangescale, total );
// Clamp
if( hicolor )
{
for( j=0; j<3; j++ )
{
total[ j ] *= clampfactor;
if( total[j] > clamp)
total[j] = clamp;
else if (total[j] < 0)
Error ("light < 0");
*out++ = (byte) total[j];
}
}
else
{
int intensity = total[ 0 ] + total[ 1 ] + total[ 2 ];
if( intensity > 255 )
intensity = 255;
else if( intensity < 0 )
Error( "light < 0" );
*out++ = (byte) intensity;
}
}
}
}
}
/*
============
LightFace
============
*/
void LightFaceLIT (int surfnum, const vec3_t faceoffset)
{
dface_t *f;
lightinfo_t l;
int s, t;
int i, j, c;
int size;
int lightmapwidth;
byte *out;
int w;
/* TYR - temp vars */
vec_t maxc;
int x1, x2, x3, x4;
/* TYR - colored lights */
vec3_t *lightcolor;
vec3_t totalcolors;
vec3_t point;
f = dfaces + surfnum;
// this version already has the light offsets calculated from
// the original lighting, so we will just reuse them.
if (f->lightofs == -1)
return;
for (j = 0 ; j < MAXLIGHTMAPS ; j++)
f->styles[j] = 255;
if ( texinfo[f->texinfo].flags & TEX_SPECIAL)
{ // non-lit texture
return;
}
memset (&l, 0, sizeof(l));
l.surfnum = surfnum;
l.face = f;
//
// rotate plane
//
VectorCopy (dplanes[f->planenum].normal, l.facenormal);
l.facedist = dplanes[f->planenum].dist;
VectorScale (l.facenormal, l.facedist, point);
VectorAdd (point, faceoffset, point);
l.facedist = DotProduct( point, l.facenormal );
if (f->side)
{
VectorNegate (l.facenormal, l.facenormal);
l.facedist = -l.facedist;
}
CalcFaceVectors (&l);
CalcFaceExtents (&l, faceoffset, true);
CalcPoints (&l);
lightmapwidth = l.texsize[0]+1;
size = lightmapwidth*(l.texsize[1]+1);
if (size > SINGLEMAP)
COM_Error ("Bad lightmap size");
for (i = 0 ; i < MAXLIGHTMAPS ; i++)
l.lightstyles[i] = 255;
l.numlightstyles = 0;
strcpy (l.texname, miptex[texinfo[f->texinfo].miptex].name);
for (i = 0 ; i < num_entities ; i++)
{
if (entities[i].light)
SingleLightFace (&entities[i], &l, faceoffset);
}
// minimum lighting
FixMinlight (&l);
if (!l.numlightstyles)
{ // no light hitting it
return;
}
//
// save out the values
//
for (i = 0 ; i < MAXLIGHTMAPS ; i++)
f->styles[i] = l.lightstyles[i];
// we have to store the new light data at
// the same offset as the old stuff...
out = &newdlightdata[faces_ltoffset[surfnum]];
// extra filtering
w = (l.texsize[0] + 1) * 2;
for (i = 0 ; i < l.numlightstyles ; i++)
{
if (l.lightstyles[i] == 0xff)
COM_Error ("Wrote empty lightmap");
lightcolor = l.lightmapcolors[i];
c = 0;
for (t = 0 ; t <= l.texsize[1] ; t++)
{
for (s = 0 ; s <= l.texsize[0] ; s++, c++)
{
if (extrasamples)
{
x1 = t*2*w + s*2;
x2 = x1 + 1;
x3 = (t*2 + 1)*w + s*2;
x4 = x3 + 1;
// calculate the color
totalcolors[0] = lightcolor[x1][0] + lightcolor[x2][0] + lightcolor[x3][0] + lightcolor[x4][0];
totalcolors[0] *= 0.25;
totalcolors[1] = lightcolor[x1][1] + lightcolor[x2][1] + lightcolor[x3][1] + lightcolor[x4][1];
totalcolors[1] *= 0.25;
totalcolors[2] = lightcolor[x1][2] + lightcolor[x2][2] + lightcolor[x3][2] + lightcolor[x4][2];
totalcolors[2] *= 0.25;
}
else
{
VectorCopy (lightcolor[c], totalcolors);
}
// CSL - Scale back intensity, instead
// of capping individual colors
VectorScale (totalcolors, rangescale, totalcolors);
maxc = 0;
for (j = 0; j < 3; j++)
{
if (totalcolors[j] > maxc)
{
maxc = totalcolors[j];
}
else if (totalcolors[j] < 0)
{
totalcolors[j] = 0; // this used to be an error!!!!
}
}
if (maxc > 255.0)
VectorScale (totalcolors, 255.0 / maxc, totalcolors);
// write out the lightmap in RGBA format
*out++ = totalcolors[0];
*out++ = totalcolors[1];
*out++ = totalcolors[2];
}
}
}
}