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Fix loops so that they work in all directions

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This commit is contained in:
JugadorXEI 2025-08-12 14:50:43 +02:00
parent 294e60bf8d
commit 47a43d0544
2 changed files with 11 additions and 88 deletions
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85
src/objects/loops.cpp
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@ -151,81 +151,6 @@ get_binary_direction
}
}
static std::optional<vector2_t>
intersect
( const mobj_t * anchor,
const mobj_t * toucher)
{
struct Line
{
angle_t a;
vector2_t o;
angle_t k = AbsAngle(a);
Line(vector2_t o_, angle_t a_) : a(a_), o(o_) {}
bool vertical() const { return k == ANGLE_90; }
fixed_t m() const
{
// tangent table is offset 90 degrees
return FTAN(a - ANGLE_90);
}
fixed_t b() const
{
return o.y - FixedMul(o.x, m());
}
fixed_t y(fixed_t x) const
{
return FixedMul(m(), x) + b();
}
};
if (toucher->momx == 0 && toucher->momy == 0)
{
// undefined angle
return {};
}
Line a({toucher->x, toucher->y},
R_PointToAngle2(0, 0, toucher->momx, toucher->momy));
Line b({anchor->x, anchor->y}, anchor->angle + ANGLE_90);
if (a.k == b.k)
{
// parallel lines do not intersect
return {};
}
vector2_t v;
auto v_intersect = [&v](Line &a, Line &b)
{
if (a.vertical())
{
return false;
}
v.x = b.o.x;
v.y = a.y(v.x);
return true;
};
if (!v_intersect(a, b) && !v_intersect(b, a))
{
// untested!
v.x = FixedDiv(a.b() - b.b(), b.m() - a.m());
v.y = a.y(v.x);
}
return v;
}
mobj_t *
Obj_FindLoopCenter (const mtag_t tag)
{
@ -330,10 +255,12 @@ Obj_LoopEndpointCollide
{
set_shiftxy(player, anchor);
vector2_t i = intersect(anchor, toucher)
.value_or(vector2_t {px, py});
s->origin_shift = {i.x - px, i.y - py};
const fixed_t magnitude = R_PointToDist2(0, 0, px, py);
const fixed_t newX = FixedDiv(px, magnitude);
const fixed_t newY = FixedDiv(py, magnitude);
s->origin_shift = {FixedMul(newX, FCOS(anchor->angle)),
FixedMul(newY, FSIN(anchor->angle))};
}
flip = get_binary_direction(pitch, toucher);

14
src/p_loop.c
View file

@ -101,7 +101,7 @@ boolean P_PlayerOrbit(player_t *player)
fixed_t r, xy, z;
fixed_t xs, ys;
fixed_t step, th, left;
fixed_t step, left;
fixed_t grav;
@ -136,16 +136,12 @@ boolean P_PlayerOrbit(player_t *player)
// XY shift is transformed on wave scale; less movement
// at start and end of rotation, more halfway.
th = FSIN(pitch_normal - ANGLE_90);
xs = FixedMul(s->shift.x, th);
ys = FixedMul(s->shift.y, th);
xs = FixedMul(s->shift.x, FCOS(pitch_normal));
ys = FixedMul(s->shift.y, FSIN(pitch_normal - ANGLE_90));
// Interpolate 0-1 over entire rotation.
th = FSIN(pitch_normal / 2);
xs += FixedMul(s->origin_shift.x, th);
ys += FixedMul(s->origin_shift.y, th);
xs += FixedMul(s->origin_shift.x, FCOS(pitch_normal));
ys += FixedMul(s->origin_shift.y, FSIN(pitch_normal - ANGLE_90));
xs += FixedMul(xy, FCOS(s->yaw));
ys += FixedMul(xy, FSIN(s->yaw));