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- Restore the BOOM fudging and destination Z calculations that disappeared sometime in

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ZDoom's prehistory to EV_SilentLineTeleport().

SVN r3207 (trunk)
This commit is contained in:
Randy Heit 2011-05-15 20:09:25 +00:00
parent 68e34e1e5c
commit 30e8552ac1
1 changed files with 44 additions and 6 deletions
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46
src/p_teleport.cpp
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@ -35,6 +35,8 @@
#include "i_system.h"
#include "doomstat.h"
#define FUDGEFACTOR 10
static FRandom pr_teleport ("Teleport");
extern void P_CalcHeight (player_t *player);
@ -476,16 +478,52 @@ bool EV_SilentLineTeleport (line_t *line, int side, AActor *thing, int id, INTBO
player_t *player = thing->player && thing->player->mo == thing ?
thing->player : NULL;
// Whether walking towards first side of exit linedef steps down
bool stepdown = l->frontsector->floorplane.ZatPoint(x, y) < l->backsector->floorplane.ZatPoint(x, y);
// Height of thing above ground
fixed_t z;
fixed_t z = thing->z - thing->floorz;
z = thing->z - line->backsector->floorplane.ZatPoint (thing->x, thing->y)
+ l->frontsector->floorplane.ZatPoint (x, y);
// Side to exit the linedef on positionally.
//
// Notes:
//
// This flag concerns exit position, not momentum. Due to
// roundoff error, the thing can land on either the left or
// the right side of the exit linedef, and steps must be
// taken to make sure it does not end up on the wrong side.
//
// Exit momentum is always towards side 1 in a reversed
// teleporter, and always towards side 0 otherwise.
//
// Exiting positionally on side 1 is always safe, as far
// as avoiding oscillations and stuck-in-wall problems,
// but may not be optimum for non-reversed teleporters.
//
// Exiting on side 0 can cause oscillations if momentum
// is towards side 1, as it is with reversed teleporters.
//
// Exiting on side 1 slightly improves player viewing
// when going down a step on a non-reversed teleporter.
int side = reverse || (player && stepdown);
int fudge = FUDGEFACTOR;
// Make sure we are on correct side of exit linedef.
while (P_PointOnLineSide(x, y, l) != side && --fudge >= 0)
{
if (abs(l->dx) > abs(l->dy))
y -= l->dx < 0 != side ? -1 : 1;
else
x += l->dy < 0 != side ? -1 : 1;
}
// Attempt to teleport, aborting if blocked
// Adjust z position to be same height above ground as before.
// Ground level at the exit is measured as the higher of the
// two floor heights at the exit linedef.
z = z + l->sidedef[stepdown]->sector->floorplane.ZatPoint(x, y);
// Attempt to teleport, aborting if blocked
if (!P_TeleportMove (thing, x, y, z, false))
{
return false;