// draws the line
void Tline::draw( Tsector *owner )
{
coord3d x1r,y1r,x2r,y2r;
coord3d t1,t2;
coord2d x1,x2,x1c,x2c;
Tmonotone mp,mph;
Twall **w;
coord3d ox1=verts[v1].x;
coord3d oy1=verts[v1].y;
coord3d ox2=verts[v2].x;
coord3d oy2=verts[v2].y;
// if the line is behind the portal, do nothing
if (!infront(ox1,oy1) && !infront(ox2,oy2)) return;
coord3d _portx1=portx1;
coord3d _porty1=porty1;
coord3d _portdx=portdx;
coord3d _portdy=portdy;
rotatez(ox1,oy1,&x1r,&y1r); // find the first vertex in camera space
rotatez(ox2,oy2,&x2r,&y2r); // find the second vertex in camera space
coord3d orx1=x1r;
coord3d orx2=x2r;
// calculates the vectors for the texture mapping
Tvector a={x1r,y1r,view.z};
Tvector p={512*(x2r-x1r)/len,512*(y2r-y1r)/len,0};
Tvector q={0,0,512};
rotateyxv(&a);
rotateyxv(&p);
rotateyxv(&q);
int clipfl=0;
// checks if the line is visible on the screen
if (y1r<=MINZ && y2r<=MINZ) {
if (y1r<0 && y2r<0) return;
if (x1r<0 && x2r<0) return;
if (x1r>0 && x2r>0) return;
if (y1r*fabs(x2r)+y2r*fabs(x1r)<0) return;
x1c=x2c=0;
// if the line is too close and is visible, it fills the whole screen
clipfl=clLEFT|clRIGHT;
}
else {
// if the line crosses the near plane, clip it
if (y1r<MINZ || y2r<MINZ) {
if (y1r<MINZ) {
clipfl=clLEFT;
t1=MINZ-y1r;
t2=y2r-MINZ;
x1r=splitab(x1r,x2r,t1,t2);
y1r=MINZ;
}
if (y2r<MINZ) {
clipfl=clRIGHT;
t1=y1r-MINZ;
t2=MINZ-y2r;
x2r=splitab(x1r,x2r,t1,t2);
y2r=MINZ;
}
}
x1=projectx(x1r,y1r);
x2=projectx(x2r,y2r);
x1c=x1;
x2c=x2;
if (x1c<cur_clip->xmin) {
x1c=cur_clip->xmin;
clipfl&=~clDRAWLEFT;
}
if (x2c>cur_clip->xmax) {
x2c=cur_clip->xmax;
clipfl&=~clDRAWRIGHT;
}
}
// if the line is perpendicular to the screen, or backfacing
if (x1c>=x2c) {
if (clipfl&clDRAW) {
if (clipfl&clDRAWLEFT) x1c=cur_clip->xmin;
if (clipfl&clDRAWRIGHT) x2c=cur_clip->xmax;
if (x1c>=x2c) return;
coord3d z0=(owner->getzf(ox1,oy1)*orx2-owner->getzf(ox2,oy2)*orx1)/(orx2-orx1);
w=walls;
for (int wi=0;wi<wallsnum;wi++,NEXTWALL(w)) {
Twall *wp=*w;
coord3d z1=(wp->z1c*orx2-wp->z2c*orx1)/(orx2-orx1);
if (z0<=view.z && z1>=view.z) {
// if there is a visible wall, fill the whole clip with it
if (is_visible(wp)) goto dr;
else break;
}
z0=z1;
}
return;
dr:
// fills the whole clip
portx1=ox1;
porty1=oy1;
portdx=ox2-ox1;
portdy=oy2-oy1;
setdrawdata(&a,&p,&q);
cur_clip->cut(x1c,x2c);
cur_clip->clip(x1c,x2c,gymax,gymin,gymax,gymin,&mp);
(*w)->draw(&mp);
deltraps(mp.traps);
cur_clip->last=mp.traps=new Ttrap(x2c,gymin,gymax,gymin,gymax,0,0,NULL);
cur_clip->restore(mp.traps);
portx1=_portx1;
porty1=_porty1;
portdx=_portdx;
portdy=_portdy;
return;
}
return;
}
portx1=ox1;
porty1=oy1;
portdx=ox2-ox1;
portdy=oy2-oy1;
// clips the line in world space (x and y in world space are needed to calculate the correct z)
if (clipfl&clCLIPLEFT) {
ox1=splitab(ox1,ox2,t1,t2);
oy1=splitab(oy1,oy2,t1,t2);
}
else if (clipfl&clCLIPRIGHT) {
ox2=splitab(ox1,ox2,t1,t2);
oy2=splitab(oy1,oy2,t1,t2);
}
coord3d zf1=owner->getzf(ox1,oy1);
coord3d zf2=owner->getzf(ox2,oy2);
coord3d zc1=owner->getzc(ox1,oy1);
coord3d zc2=owner->getzc(ox2,oy2);
// finds the screen y coordinates (the screen x-es are x1c and x2c)
coord2d pf1=projectz(zf1,y1r);// floor
coord2d pf2=projectz(zf2,y2r);
coord2d pc1=projectz(zc1,y1r);// ceiling
coord2d pc2=projectz(zc2,y2r);
// interpolates the z-s if the x-es are changed by cur_clip
if (x1<x1c) {
pf1=splitab(pf1,pf2,x1c-x1,x2-x1c);
pc1=splitab(pc1,pc2,x1c-x1,x2-x1c);
}
if (x2>x2c) {
pf2=splitab(pf1,pf2,x2c-x1c,x2-x2c);
pc2=splitab(pc1,pc2,x2c-x1c,x2-x2c);
}
// cuts the portion of cur_clip that is over the walls
cur_clip->cut(x1c,x2c);
// clips the floor polygon with cur_clip
cur_clip->clip(x1c,x2c,pf1,cur_clip->ymin,pf2,cur_clip->ymin,&mp);
owner->draw_floor(&mp);
deltraps(mp.traps);
// clips the ceiling polygon with cur_clip
cur_clip->clip(x1c,x2c,cur_clip->ymax,pc1,cur_clip->ymax,pc2,&mp);
owner->draw_ceiling(&mp);
deltraps(mp.traps);
mph.traps=NULL;
int wi;
w=walls;
// draws all the walls
for (wi=0;wi<wallsnum;wi++,NEXTWALL(w)) {
Twall *wp=*w;
coord3d zq1=wp->z1c;
coord3d zq2=wp->z2c;
// interpolates z-s if necessary
if (clipfl&clCLIPLEFT) zq1=splitab(zq1,zq2,t1,t2);
if (clipfl&clCLIPRIGHT) zq2=splitab(zq1,zq2,t1,t2);
// project the z-s
coord2d pq1=projectz(zq1,y1r);
coord2d pq2=projectz(zq2,y2r);
// interpolates the projection
if (x1<x1c) pq1=splitab(pq1,pq2,x1c-x1,x2-x1c);
if (x2>x2c) pq2=splitab(pq1,pq2,x2c-x1c,x2-x2c);
if (is_visible(wp)) {
// if the wall is visible (wall or portal), draw it
cur_clip->clip(x1c,x2c,pq1,pf1,pq2,pf2,&mp);
if ((clipfl&clDRAW)) {
if ((clipfl&clDRAWLEFT) && pq1>0 && pf1<0) cur_clip->addbeg(&mp);
else if ((clipfl&clDRAWRIGHT) && pq2>0 && pf2<0) cur_clip->addend(&mp);
}
setdrawdata(&a,&p,&q);
(*w)->draw(&mp);
deltraps(mp.traps);
}
else {
// if the wall is a hole, clip it only
cur_clip->clip(x1c,x2c,pq1,pf1,pq2,pf2,&mph);
}
pf1=pq1;
pf2=pq2;
}
// restores cur_clip
if (mph.traps) {
Ttrap *t;
for (t=mph.traps;t->next;t=t->next);
cur_clip->last=t;
}
else {
cur_clip->last=mph.traps=new Ttrap(x2c,gymin,gymax,gymin,gymax,0,0,NULL);
}
cur_clip->restore(mph.traps);
portx1=_portx1;
porty1=_porty1;
portdx=_portdx;
portdy=_portdy;
}
void Vector3::rotate(float rx, float ry, float rz)
{
rotatex(rx);
rotatey(ry);
rotatez(rz);
}
