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Merge branch 'sub-add-shadow' into 'master'

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Subtractive shadows

See merge request KartKrew/Kart!369
This commit is contained in:
Sal 2021-02-12 19:25:13 -05:00
commit c594d5063f
1 changed files with 12 additions and 23 deletions
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35
src/r_things.c
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@ -1236,28 +1236,24 @@ static void R_ProjectDropShadow(mobj_t *thing, vissprite_t *vis, fixed_t scale,
patch_t *patch;
fixed_t xscale, yscale, shadowxscale, shadowyscale, shadowskew, x1, x2;
INT32 light = 0;
fixed_t scalemul; UINT8 trans;
fixed_t floordiff;
UINT8 trans = tr_transsub;
fixed_t groundz;
pslope_t *groundslope;
boolean isflipped = thing->eflags & MFE_VERTICALFLIP;
groundz = R_GetShadowZ(thing, &groundslope);
if (abs(groundz-viewz)/tz > 4) return; // Prevent stretchy shadows and possible crashes
floordiff = abs((isflipped ? thing->height : 0) + thing->z - groundz);
if (thing->whiteshadow == true)
{
trans = tr_transadd;
}
trans = floordiff / (100*FRACUNIT) + 3;
if (trans >= 9) return;
scalemul = FixedMul(FRACUNIT - floordiff/640, scale);
patch = W_CachePatchName((thing->whiteshadow == true ? "LSHADOW" : "DSHADOW"), PU_CACHE);
patch = W_CachePatchName("DSHADOW", PU_CACHE);
xscale = FixedDiv(projection[viewssnum], tz);
yscale = FixedDiv(projectiony[viewssnum], tz);
shadowxscale = FixedMul(thing->radius*2, scalemul);
shadowyscale = FixedMul(FixedMul(thing->radius*2, scalemul), FixedDiv(abs(groundz - viewz), tz));
shadowxscale = FixedMul(thing->radius*2, scale);
shadowyscale = FixedMul(FixedMul(thing->radius*2, scale), FixedDiv(abs(groundz - viewz), tz));
shadowyscale = min(shadowyscale, shadowxscale) / SHORT(patch->height);
shadowxscale /= SHORT(patch->width);
shadowskew = 0;
@ -1274,9 +1270,9 @@ static void R_ProjectDropShadow(mobj_t *thing, vissprite_t *vis, fixed_t scale,
//CONS_Printf("Shadow is sloped by %d %d\n", xslope, zslope);
if (viewz < groundz)
shadowyscale += FixedMul(FixedMul(thing->radius*2 / SHORT(patch->height), scalemul), zslope);
shadowyscale += FixedMul(FixedMul(thing->radius*2 / SHORT(patch->height), scale), zslope);
else
shadowyscale -= FixedMul(FixedMul(thing->radius*2 / SHORT(patch->height), scalemul), zslope);
shadowyscale -= FixedMul(FixedMul(thing->radius*2 / SHORT(patch->height), scale), zslope);
shadowyscale = abs(shadowyscale);
@ -1354,16 +1350,9 @@ static void R_ProjectDropShadow(mobj_t *thing, vissprite_t *vis, fixed_t scale,
else
shadow->extra_colormap = thing->subsector->sector->extra_colormap;
shadow->transmap = transtables + (trans<<FF_TRANSSHIFT);
shadow->transmap = transtables + ((trans-1) << FF_TRANSSHIFT);
if (thing->whiteshadow == true)
{
shadow->colormap = scalelight[LIGHTLEVELS - 1][0]; // full bright!
}
else
{
shadow->colormap = scalelight[0][0]; // full dark!
}
shadow->colormap = colormaps;
objectsdrawn++;
}