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Refactor shadow floor finding code a bit 

I tried to fix ring shadows on polyobjects and got this in return:
https://media.discordapp.net/attachments/629477786943356938/664695818913185822/srb20156.png
This commit is contained in:
fickleheart 2020-01-08 23:19:52 -06:00
parent a7edf51cb9
commit fa4b49d52c
2 changed files with 117 additions and 45 deletions
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160
src/r_things.c
View File

@ -1095,6 +1095,120 @@ static void R_SplitSprite(vissprite_t *sprite)
}
}
//
// R_GetShadowZ(thing, shadowslope)
// Get the first visible floor below the object for shadows
// shadowslope is filled with the floor's slope, if provided
//
fixed_t R_GetShadowZ(mobj_t *thing, pslope_t **shadowslope)
{
fixed_t z, floorz = INT32_MIN;
pslope_t *slope, *floorslope = NULL;
msecnode_t *node;
sector_t *sector;
ffloor_t *rover;
for (node = thing->touching_sectorlist; node; node = node->m_sectorlist_next)
{
sector = node->m_sector;
slope = (sector->heightsec != -1) ? NULL : sector->f_slope;
z = slope ? P_GetZAt(slope, thing->x, thing->y) : (
(sector->heightsec != -1) ? sectors[sector->heightsec].floorheight : sector->floorheight
);
if (z < thing->z+thing->height/2 && z > floorz)
{
floorz = z;
floorslope = slope;
}
if (sector->ffloors)
for (rover = sector->ffloors; rover; rover = rover->next)
{
if (!(rover->flags & FF_EXISTS) || !(rover->flags & FF_RENDERPLANES) || (rover->alpha < 90 && !(rover->flags & FF_SWIMMABLE)))
continue;
z = *rover->t_slope ? P_GetZAt(*rover->t_slope, thing->x, thing->y) : *rover->topheight;
if (z < thing->z+thing->height/2 && z > floorz)
{
floorz = z;
floorslope = *rover->t_slope;
}
}
}
if (thing->floorz > floorz + (!floorslope ? 0 : FixedMul(abs(floorslope->zdelta), thing->radius*3/2)))
{
floorz = thing->floorz;
floorslope = NULL;
}
#if 0 // Unfortunately, this drops CEZ2 down to sub-17 FPS on my i7.
//#ifdef POLYOBJECTS
// Check polyobjects and see if floorz needs to be altered, for rings only because they don't update floorz
if (thing->type == MT_RING)
{
INT32 xl, xh, yl, yh, bx, by;
xl = (unsigned)(thing->x - thing->radius - bmaporgx)>>MAPBLOCKSHIFT;
xh = (unsigned)(thing->x + thing->radius - bmaporgx)>>MAPBLOCKSHIFT;
yl = (unsigned)(thing->y - thing->radius - bmaporgy)>>MAPBLOCKSHIFT;
yh = (unsigned)(thing->y + thing->radius - bmaporgy)>>MAPBLOCKSHIFT;
BMBOUNDFIX(xl, xh, yl, yh);
validcount++;
for (by = yl; by <= yh; by++)
for (bx = xl; bx <= xh; bx++)
{
INT32 offset;
polymaplink_t *plink; // haleyjd 02/22/06
if (bx < 0 || by < 0 || bx >= bmapwidth || by >= bmapheight)
continue;
offset = by*bmapwidth + bx;
// haleyjd 02/22/06: consider polyobject lines
plink = polyblocklinks[offset];
while (plink)
{
polyobj_t *po = plink->po;
if (po->validcount != validcount) // if polyobj hasn't been checked
{
po->validcount = validcount;
if (!P_MobjInsidePolyobj(po, thing) || !(po->flags & POF_RENDERPLANES))
{
plink = (polymaplink_t *)(plink->link.next);
continue;
}
// We're inside it! Yess...
z = po->lines[0]->backsector->ceilingheight;
if (z < thing->z+thing->height/2 && z > floorz)
{
floorz = z;
floorslope = NULL;
}
}
plink = (polymaplink_t *)(plink->link.next);
}
}
}
#endif
if (shadowslope != NULL)
*shadowslope = floorslope;
return floorz;
}
static void R_ProjectDropShadow(mobj_t *thing, vissprite_t *vis, fixed_t tx, fixed_t tz)
{
vissprite_t *shadow;
@ -1106,51 +1220,7 @@ static void R_ProjectDropShadow(mobj_t *thing, vissprite_t *vis, fixed_t tx, fix
fixed_t floorz;
pslope_t *floorslope;
// Get floorz as the first floor below the object that's visible
floorz = (vis->heightsec != -1) ? sectors[vis->heightsec].floorheight : thing->floorz;
floorslope = (vis->heightsec != -1) ? NULL : thing->standingslope;
{
boolean original = true;
fixed_t z;
if (vis->sector->ffloors)
{
ffloor_t *rover = vis->sector->ffloors;
for (; rover; rover = rover->next)
{
if (!(rover->flags & FF_EXISTS) || !(rover->flags & FF_RENDERPLANES) || (rover->alpha < 90 && !(rover->flags & FF_SWIMMABLE)))
continue;
z = *rover->t_slope ? P_GetZAt(*rover->t_slope, thing->x, thing->y) : *rover->topheight;
if (z < thing->z+thing->height/3 && z > floorz)
{
floorz = z;
floorslope = *rover->t_slope;
original = false;
}
else if (original && (*rover->t_slope) && z < thing->z+thing->height/3 && z > floorz - FixedMul(abs((*rover->t_slope)->zdelta), thing->radius*2))
{
// Guesstimated to be a usable floor. This is here to handle floorslope of non-grounded things, I guess.
floorz = z;
floorslope = *rover->t_slope;
original = false;
}
}
}
if (original && vis->sector->f_slope)
{
z = P_GetZAt(vis->sector->f_slope, thing->x, thing->y);
if (z < thing->z+thing->height/3 && z > floorz - FixedMul(abs(vis->sector->f_slope->zdelta), thing->radius*2))
{
floorz = z;
floorslope = vis->sector->f_slope;
}
}
}
floorz = R_GetShadowZ(thing, &floorslope);
if (abs(floorz-viewz)/tz > 4) return; // Prevent stretchy shadows and possible crashes

2
src/r_things.h
View File

@ -55,6 +55,8 @@ void R_DrawFlippedMaskedColumn(column_t *column, INT32 texheight);
// (only sprites from namelist are added or replaced)
void R_AddSpriteDefs(UINT16 wadnum);
fixed_t R_GetShadowZ(mobj_t *thing, pslope_t **shadowslope);
//SoM: 6/5/2000: Light sprites correctly!
void R_AddSprites(sector_t *sec, INT32 lightlevel);
void R_InitSprites(void);