forked from valve/halflife-sdk
688 lines
14 KiB
C
688 lines
14 KiB
C
//========= Copyright © 1996-2001, Valve LLC, All rights reserved. ============
|
|
//
|
|
// Purpose:
|
|
//
|
|
// $NoKeywords: $
|
|
//=============================================================================
|
|
|
|
#include "light.h"
|
|
|
|
extern qboolean hicolor;
|
|
extern qboolean clamp192;
|
|
|
|
/*
|
|
============
|
|
CastRay
|
|
|
|
Returns the distance between the points, or -1 if blocked
|
|
=============
|
|
*/
|
|
vec_t CastRay (vec3_t p1, vec3_t p2)
|
|
{
|
|
int i;
|
|
vec_t t;
|
|
qboolean trace;
|
|
|
|
trace = TestLine (p1, p2);
|
|
|
|
if (!trace)
|
|
return -1; // ray was blocked
|
|
|
|
t = 0;
|
|
for (i=0 ; i< 3 ; i++)
|
|
t += (p2[i]-p1[i]) * (p2[i]-p1[i]);
|
|
|
|
if (t == 0)
|
|
t = 1; // don't blow up...
|
|
return sqrt(t);
|
|
}
|
|
|
|
/*
|
|
===============================================================================
|
|
|
|
SAMPLE POINT DETERMINATION
|
|
|
|
void SetupBlock (dface_t *f) Returns with surfpt[] set
|
|
|
|
This is a little tricky because the lightmap covers more area than the face.
|
|
If done in the straightforward fashion, some of the
|
|
sample points will be inside walls or on the other side of walls, causing
|
|
false shadows and light bleeds.
|
|
|
|
To solve this, I only consider a sample point valid if a line can be drawn
|
|
between it and the exact midpoint of the face. If invalid, it is adjusted
|
|
towards the center until it is valid.
|
|
|
|
(this doesn't completely work)
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
#define SINGLEMAP (18*18*4)
|
|
|
|
typedef struct
|
|
{
|
|
vec3_t lightmaps[MAXLIGHTMAPS][SINGLEMAP];
|
|
int numlightstyles;
|
|
vec_t *light;
|
|
vec_t facedist;
|
|
vec3_t facenormal;
|
|
|
|
int numsurfpt;
|
|
vec3_t surfpt[SINGLEMAP];
|
|
|
|
vec3_t texorg;
|
|
vec3_t worldtotex[2]; // s = (world - texorg) . worldtotex[0]
|
|
vec3_t textoworld[2]; // world = texorg + s * textoworld[0]
|
|
|
|
vec_t exactmins[2], exactmaxs[2];
|
|
|
|
int texmins[2], texsize[2];
|
|
int lightstyles[256];
|
|
int surfnum;
|
|
dface_t *face;
|
|
} lightinfo_t;
|
|
|
|
|
|
/*
|
|
================
|
|
CalcFaceVectors
|
|
|
|
Fills in texorg, worldtotex. and textoworld
|
|
================
|
|
*/
|
|
void CalcFaceVectors (lightinfo_t *l)
|
|
{
|
|
texinfo_t *tex;
|
|
int i, j;
|
|
vec3_t texnormal;
|
|
float distscale;
|
|
vec_t dist, len;
|
|
|
|
tex = &texinfo[l->face->texinfo];
|
|
|
|
// convert from float to vec_t
|
|
for (i=0 ; i<2 ; i++)
|
|
for (j=0 ; j<3 ; j++)
|
|
l->worldtotex[i][j] = tex->vecs[i][j];
|
|
|
|
// calculate a normal to the texture axis. points can be moved along this
|
|
// without changing their S/T
|
|
texnormal[0] = tex->vecs[1][1]*tex->vecs[0][2]
|
|
- tex->vecs[1][2]*tex->vecs[0][1];
|
|
texnormal[1] = tex->vecs[1][2]*tex->vecs[0][0]
|
|
- tex->vecs[1][0]*tex->vecs[0][2];
|
|
texnormal[2] = tex->vecs[1][0]*tex->vecs[0][1]
|
|
- tex->vecs[1][1]*tex->vecs[0][0];
|
|
VectorNormalize (texnormal);
|
|
|
|
// flip it towards plane normal
|
|
distscale = DotProduct (texnormal, l->facenormal);
|
|
if (!distscale)
|
|
Error ("Texture axis perpendicular to face");
|
|
if (distscale < 0)
|
|
{
|
|
distscale = -distscale;
|
|
VectorSubtract (vec3_origin, texnormal, texnormal);
|
|
}
|
|
|
|
// distscale is the ratio of the distance along the texture normal to
|
|
// the distance along the plane normal
|
|
distscale = 1/distscale;
|
|
|
|
for (i=0 ; i<2 ; i++)
|
|
{
|
|
len = VectorLength (l->worldtotex[i]);
|
|
dist = DotProduct (l->worldtotex[i], l->facenormal);
|
|
dist *= distscale;
|
|
VectorMA (l->worldtotex[i], -dist, texnormal, l->textoworld[i]);
|
|
VectorScale (l->textoworld[i], (1/len)*(1/len), l->textoworld[i]);
|
|
}
|
|
|
|
|
|
// calculate texorg on the texture plane
|
|
for (i=0 ; i<3 ; i++)
|
|
l->texorg[i] = -tex->vecs[0][3]* l->textoworld[0][i] - tex->vecs[1][3] * l->textoworld[1][i];
|
|
|
|
// project back to the face plane
|
|
dist = DotProduct (l->texorg, l->facenormal) - l->facedist - 1;
|
|
dist *= distscale;
|
|
VectorMA (l->texorg, -dist, texnormal, l->texorg);
|
|
|
|
}
|
|
|
|
/*
|
|
================
|
|
CalcFaceExtents
|
|
|
|
Fills in s->texmins[] and s->texsize[]
|
|
also sets exactmins[] and exactmaxs[]
|
|
================
|
|
*/
|
|
void CalcFaceExtents (lightinfo_t *l)
|
|
{
|
|
dface_t *s;
|
|
vec_t mins[2], maxs[2], val;
|
|
int i,j, e;
|
|
dvertex_t *v;
|
|
texinfo_t *tex;
|
|
|
|
s = l->face;
|
|
|
|
mins[0] = mins[1] = 999999;
|
|
maxs[0] = maxs[1] = -99999;
|
|
|
|
tex = &texinfo[s->texinfo];
|
|
|
|
for (i=0 ; i<s->numedges ; i++)
|
|
{
|
|
e = dsurfedges[s->firstedge+i];
|
|
if (e >= 0)
|
|
v = dvertexes + dedges[e].v[0];
|
|
else
|
|
v = dvertexes + dedges[-e].v[1];
|
|
|
|
for (j=0 ; j<2 ; j++)
|
|
{
|
|
val = v->point[0] * tex->vecs[j][0] +
|
|
v->point[1] * tex->vecs[j][1] +
|
|
v->point[2] * tex->vecs[j][2] +
|
|
tex->vecs[j][3];
|
|
if (val < mins[j])
|
|
mins[j] = val;
|
|
if (val > maxs[j])
|
|
maxs[j] = val;
|
|
}
|
|
}
|
|
|
|
for (i=0 ; i<2 ; i++)
|
|
{
|
|
l->exactmins[i] = mins[i];
|
|
l->exactmaxs[i] = maxs[i];
|
|
|
|
mins[i] = floor(mins[i]/16);
|
|
maxs[i] = ceil(maxs[i]/16);
|
|
|
|
l->texmins[i] = mins[i];
|
|
l->texsize[i] = maxs[i] - mins[i];
|
|
if (l->texsize[i] > 17)
|
|
Error ("Bad surface extents");
|
|
}
|
|
}
|
|
|
|
/*
|
|
=================
|
|
CalcPoints
|
|
|
|
For each texture aligned grid point, back project onto the plane
|
|
to get the world xyz value of the sample point
|
|
=================
|
|
*/
|
|
int c_bad;
|
|
void CalcPoints (lightinfo_t *l)
|
|
{
|
|
int i;
|
|
int s, t, j;
|
|
int w, h, step;
|
|
vec_t starts, startt, us, ut;
|
|
vec_t *surf;
|
|
vec_t mids, midt;
|
|
vec3_t facemid, move;
|
|
|
|
//
|
|
// fill in surforg
|
|
// the points are biased towards the center of the surface
|
|
// to help avoid edge cases just inside walls
|
|
//
|
|
surf = l->surfpt[0];
|
|
mids = (l->exactmaxs[0] + l->exactmins[0])/2;
|
|
midt = (l->exactmaxs[1] + l->exactmins[1])/2;
|
|
|
|
for (j=0 ; j<3 ; j++)
|
|
facemid[j] = l->texorg[j] + l->textoworld[0][j]*mids + l->textoworld[1][j]*midt;
|
|
|
|
if (extrasamples)
|
|
{ // extra filtering
|
|
h = (l->texsize[1]+1)*2;
|
|
w = (l->texsize[0]+1)*2;
|
|
starts = (l->texmins[0]-0.5)*16;
|
|
startt = (l->texmins[1]-0.5)*16;
|
|
step = 8;
|
|
}
|
|
else
|
|
{
|
|
h = l->texsize[1]+1;
|
|
w = l->texsize[0]+1;
|
|
starts = l->texmins[0]*16;
|
|
startt = l->texmins[1]*16;
|
|
step = 16;
|
|
}
|
|
|
|
l->numsurfpt = w * h;
|
|
for (t=0 ; t<h ; t++)
|
|
{
|
|
for (s=0 ; s<w ; s++, surf+=3)
|
|
{
|
|
us = starts + s*step;
|
|
ut = startt + t*step;
|
|
|
|
// if a line can be traced from surf to facemid, the point is good
|
|
for (i=0 ; i<6 ; i++)
|
|
{
|
|
// calculate texture point
|
|
for (j=0 ; j<3 ; j++)
|
|
surf[j] = l->texorg[j] + l->textoworld[0][j]*us
|
|
+ l->textoworld[1][j]*ut;
|
|
|
|
if (CastRay (facemid, surf) != -1)
|
|
break; // got it
|
|
if (i & 1)
|
|
{
|
|
if (us > mids)
|
|
{
|
|
us -= 8;
|
|
if (us < mids)
|
|
us = mids;
|
|
}
|
|
else
|
|
{
|
|
us += 8;
|
|
if (us > mids)
|
|
us = mids;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (ut > midt)
|
|
{
|
|
ut -= 8;
|
|
if (ut < midt)
|
|
ut = midt;
|
|
}
|
|
else
|
|
{
|
|
ut += 8;
|
|
if (ut > midt)
|
|
ut = midt;
|
|
}
|
|
}
|
|
|
|
// move surf 8 pixels towards the center
|
|
VectorSubtract (facemid, surf, move);
|
|
VectorNormalize (move);
|
|
VectorMA (surf, 8, move, surf);
|
|
}
|
|
if (i == 2)
|
|
c_bad++;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
===============================================================================
|
|
|
|
FACE LIGHTING
|
|
|
|
===============================================================================
|
|
*/
|
|
|
|
int c_culldistplane, c_proper;
|
|
|
|
/*
|
|
================
|
|
SingleLightFace
|
|
================
|
|
*/
|
|
void SingleLightFace (lightentity_t *light, lightinfo_t *l)
|
|
{
|
|
vec_t dist;
|
|
vec3_t incoming;
|
|
vec_t angle;
|
|
vec_t add;
|
|
vec_t *surf;
|
|
qboolean hit;
|
|
int mapnum;
|
|
int size;
|
|
int c, i;
|
|
vec3_t rel;
|
|
vec3_t spotvec;
|
|
vec_t falloff;
|
|
vec3_t *lightsamp;
|
|
float intensity;
|
|
|
|
VectorSubtract (light->origin, bsp_origin, rel);
|
|
dist = scaledist * (DotProduct (rel, l->facenormal) - l->facedist);
|
|
|
|
// don't bother with lights behind the surface
|
|
if (dist <= 0)
|
|
return;
|
|
|
|
// don't bother with light too far away
|
|
intensity = ( light->light[ 0 ] + light->light[ 1 ] + light->light[ 2 ] ) / 3.0;
|
|
if( dist > intensity )
|
|
{
|
|
c_culldistplane++;
|
|
return;
|
|
}
|
|
|
|
if (light->targetent)
|
|
{
|
|
VectorSubtract (light->targetorigin, light->origin, spotvec);
|
|
VectorNormalize (spotvec);
|
|
if (!light->angle)
|
|
falloff = -cos(20*Q_PI/180);
|
|
else
|
|
falloff = -cos(light->angle/2*Q_PI/180);
|
|
}
|
|
else
|
|
falloff = 0; // shut up compiler warnings
|
|
|
|
mapnum = 0;
|
|
for (mapnum=0 ; mapnum<l->numlightstyles ; mapnum++)
|
|
if (l->lightstyles[mapnum] == light->style)
|
|
break;
|
|
lightsamp = l->lightmaps[mapnum];
|
|
if (mapnum == l->numlightstyles)
|
|
{ // init a new light map
|
|
if (mapnum == MAXLIGHTMAPS)
|
|
{
|
|
printf ("WARNING: Too many light styles on a face\n");
|
|
return;
|
|
}
|
|
size = (l->texsize[1]+1)*(l->texsize[0]+1);
|
|
for (i=0 ; i<size ; i++)
|
|
{
|
|
lightsamp[i][0] = 0;
|
|
lightsamp[i][1] = 0;
|
|
lightsamp[i][2] = 0;
|
|
}
|
|
}
|
|
|
|
//
|
|
// check it for real
|
|
//
|
|
hit = false;
|
|
c_proper++;
|
|
|
|
surf = l->surfpt[0];
|
|
for (c=0 ; c<l->numsurfpt ; c++, surf+=3)
|
|
{
|
|
dist = CastRay(light->origin, surf)*scaledist;
|
|
if (dist < 0)
|
|
continue; // light doesn't reach
|
|
|
|
VectorSubtract (light->origin, surf, incoming);
|
|
VectorNormalize (incoming);
|
|
angle = DotProduct (incoming, l->facenormal);
|
|
if (light->targetent)
|
|
{ // spotlight cutoff
|
|
if (DotProduct (spotvec, incoming) > falloff)
|
|
continue;
|
|
}
|
|
|
|
angle = (1.0-scalecos) + scalecos*angle;
|
|
for( i=0; i<3; i++ )
|
|
{
|
|
add = light->light[i] - dist;
|
|
add *= angle;
|
|
if (add < 0)
|
|
continue;
|
|
|
|
lightsamp[c][i] += add;
|
|
}
|
|
|
|
// check intensity
|
|
intensity = ( lightsamp[ c ][ 0 ] + lightsamp[ c ][ 1 ] + lightsamp[ c ][ 2 ] ) / 3.0;
|
|
if( intensity > 1 ) // ignore real tiny lights
|
|
hit = true;
|
|
}
|
|
|
|
if (mapnum == l->numlightstyles && hit)
|
|
{
|
|
l->lightstyles[mapnum] = light->style;
|
|
l->numlightstyles++; // the style has some real data now
|
|
}
|
|
}
|
|
|
|
/*
|
|
============
|
|
FixMinlight
|
|
============
|
|
*/
|
|
void FixMinlight (lightinfo_t *l)
|
|
{
|
|
int i, j;
|
|
float minlight;
|
|
|
|
minlight = minlights[l->surfnum];
|
|
|
|
// if minlight is set, there must be a style 0 light map
|
|
if (!minlight)
|
|
return;
|
|
|
|
for (i=0 ; i< l->numlightstyles ; i++)
|
|
{
|
|
if (l->lightstyles[i] == 0)
|
|
break;
|
|
}
|
|
if (i == l->numlightstyles)
|
|
{
|
|
if (l->numlightstyles == MAXLIGHTMAPS)
|
|
return; // oh well..
|
|
|
|
for (j=0 ; j<l->numsurfpt ; j++)
|
|
{
|
|
l->lightmaps[i][j][0] = minlight;
|
|
l->lightmaps[i][j][1] = minlight;
|
|
l->lightmaps[i][j][2] = minlight;
|
|
}
|
|
|
|
l->lightstyles[i] = 0;
|
|
l->numlightstyles++;
|
|
}
|
|
else
|
|
{
|
|
for (j=0 ; j<l->numsurfpt ; j++)
|
|
{
|
|
float intensity = ( l->lightmaps[i][j][0] + l->lightmaps[i][j][1] + l->lightmaps[i][j][2] ) / 3.0;
|
|
|
|
if ( intensity < minlight )
|
|
{
|
|
l->lightmaps[i][j][0] = minlight;
|
|
l->lightmaps[i][j][1] = minlight;
|
|
l->lightmaps[i][j][2] = minlight;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
============
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|