Jumpbug: automatic duck+jump on damaging falls

- Predict the landing speed from the current vertical velocity and a swept
  standing-hull ground trace; engage only when it exceeds
  PLAYER_MAX_SAFE_FALL_SPEED.
- Press duck one command before the unduck window so FinishDuck's 36-unit
  origin raise places the feet ~37 units above the floor.
- On the next command release duck and press jump: PlayerMove runs Duck()
  before CheckJumpButton, so FinishUnDuck sets ground, the jump executes, and
  CheckFalling never sees ground for the fall-damage check.
- Measure the per-command fall from consecutive airborne origins instead of a
  fixed tick interval; clear IN_JUMP while waiting so the pogo latch is clear.
- New Movement -> Jumpbug -> Active toggle (default on), config [jumpbug].

1 files changed, 5 insertions, 3 deletions

diff --git a/src/hl2h.h b/src/hl2h.h
index fdc88c1..92ae3f1 100644
--- a/src/hl2h.h
+++ b/src/hl2h.h
@@ -128,8 +128,8 @@ struct CUserCmd {
 // ---------------------------------------------------------------------------
 
 enum { IN_ATTACK = 1 << 0, IN_JUMP = 1 << 1, IN_DUCK = 1 << 2, IN_USE = 1 << 5 };
-enum { FL_ONGROUND = 1 << 0, FL_INWATER = 1 << 9 };
-enum { MOVETYPE_NOCLIP = 8, MOVETYPE_LADDER = 9 };
+enum { FL_ONGROUND = 1 << 0, FL_DUCKING = 1 << 1, FL_INWATER = 1 << 9 };
+enum { MOVETYPE_WALK = 2, MOVETYPE_NOCLIP = 8, MOVETYPE_LADDER = 9 };
 
 // ---------------------------------------------------------------------------
 // vector math
@@ -152,7 +152,8 @@ enum FeatureId {
   FEAT_ESP = 2,
   FEAT_AIMBOT = 3,
   FEAT_TRIGGERBOT = 4,
-  FEAT_SILENTAIM = 5
+  FEAT_SILENTAIM = 5,
+  FEAT_JUMPBUG = 6
 };
 enum EspOption {
   ESP_OPT_SHOW_NEUTRAL = 0,
@@ -200,6 +201,7 @@ bool world_to_screen(const Vector &w, float &sx, float &sy);
 void set_silent_restore(const QAngle &angles);
 bool is_visible(const Vector &eye, const Vector &point);
 void *trace_entity(const Vector &start, const Vector &end, void *ignore);
+float ground_distance(const Vector &origin, void *ignore, float max_dist);
 
 // bones.cpp — client-side animated skeleton / hitbox access (see there)
 bool bones_update(int idx, void *ent);