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Copy tripwire texture to opposite side and automatically mirror texture alignment

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James R 2022-01-20 21:52:10 -08:00 • committed by SinnamonLat
parent 3759f88cb3
commit 6e08e67986
1 changed files with 42 additions and 1 deletions
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43
src/p_setup.c
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@ -1940,6 +1940,24 @@ static void P_LoadTextmap(void)
}
}
static fixed_t
P_MirrorTextureOffset
( fixed_t offset,
fixed_t source_width,
fixed_t actual_width)
{
/*
Adjusting the horizontal alignment is a bit ASS...
Textures on the opposite side of the line will begin
drawing from the opposite end.
Start with the texture width and subtract the seg
length to account for cropping/wrapping. Subtract the
offset to mirror the alignment.
*/
return source_width - actual_width - offset;
}
static boolean P_CheckLineSideTripWire(line_t *ld, int p)
{
INT32 n;
@ -1961,6 +1979,28 @@ static boolean P_CheckLineSideTripWire(line_t *ld, int p)
terrain = K_GetTerrainForTextureNum(sda->midtexture);
tripwire = terrain && (terrain->flags & TRF_TRIPWIRE);
if (tripwire)
{
// copy midtexture to other side
n = ld->sidenum[!p];
if (n != 0xffff)
{
fixed_t linelength = FixedHypot(ld->dx, ld->dy);
texture_t *tex = textures[sda->midtexture];
sdb = &sides[n];
sdb->midtexture = sda->midtexture;
sdb->rowoffset = sda->rowoffset;
// mirror texture alignment
sdb->textureoffset = P_MirrorTextureOffset(
sda->textureoffset, tex->width * FRACUNIT,
linelength);
}
}
return tripwire;
}
@ -1974,7 +2014,8 @@ static void P_ProcessLinedefsAfterSidedefs(void)
ld->frontsector = sides[ld->sidenum[0]].sector; //e6y: Can't be -1 here
ld->backsector = ld->sidenum[1] != 0xffff ? sides[ld->sidenum[1]].sector : 0;
// Check for tripwire on either side
// Check for tripwire, if either side matches then
// copy that (mid)texture to the other side.
ld->tripwire =
P_CheckLineSideTripWire(ld, 0) ||
P_CheckLineSideTripWire(ld, 1);