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, 19 insertions, 9 deletions

diff --git a/src/menu.cpp b/src/menu.cpp
index 3e20cb3..0ed89d4 100644
--- a/src/menu.cpp
+++ b/src/menu.cpp
@@ -62,6 +62,7 @@ static FeatureState g_bhop{true, 0};
 static bool g_bhop_autostrafe = true;
 
 static FeatureState g_abh{true, 0};
+static FeatureState g_jumpbug{true, 0};
 static FeatureState g_esp{true, 0};
 static FeatureState g_aimbot{true, 604}; // default Mouse5, rebindable in menu
 static FeatureState g_triggerbot{true, 603}; // default Mouse4
@@ -96,6 +97,8 @@ static MenuNode g_bhop_active{NODE_TOGGLE, "Active", false, 0, {}, &g_bhop.activ
 static MenuNode g_bhop_autostrafe_node{NODE_TOGGLE, "Uni-directional auto-strafe", false, 0, {}, &g_bhop_autostrafe, nullptr, nullptr};
 static MenuNode g_abh_feat{NODE_FEATURE, "ABH", false, 1, {}, nullptr, nullptr, nullptr};
 static MenuNode g_abh_active{NODE_TOGGLE, "Active", false, 0, {}, &g_abh.active, nullptr, nullptr};
+static MenuNode g_jumpbug_feat{NODE_FEATURE, "Jumpbug", false, 1, {}, nullptr, nullptr, nullptr};
+static MenuNode g_jumpbug_active{NODE_TOGGLE, "Active", false, 0, {}, &g_jumpbug.active, nullptr, nullptr};
 static MenuNode g_esp_feat{NODE_FEATURE, "ESP", false, 1, {}, nullptr, nullptr, nullptr};
 static MenuNode g_esp_active{NODE_TOGGLE, "Active", false, 0, {}, &g_esp.active, nullptr, nullptr};
 static MenuNode g_esp_opt_nodes[ESP_OPT_COUNT] = {
@@ -145,6 +148,9 @@ static void build_tree() {
   g_bhop_feat.children[1] = &g_bhop_autostrafe_node;
   g_bhop_feat.child_count = 2;
   g_abh_feat.children[0] = &g_abh_active;
+  g_abh_feat.child_count = 1;
+  g_jumpbug_feat.children[0] = &g_jumpbug_active;
+  g_jumpbug_feat.child_count = 1;
   g_esp_feat.children[0] = &g_esp_active;
   g_aimbot_feat.children[0] = &g_aimbot_active;
   g_aimbot_feat.children[1] = &g_aimbot_bind;
@@ -169,11 +175,12 @@ static void build_tree() {
   g_esp_feat.child_count = ESP_OPT_COUNT + 1;
   g_root.children[0] = &g_bhop_feat;
   g_root.children[1] = &g_abh_feat;
-  g_root.children[2] = &g_esp_feat;
-  g_root.children[3] = &g_aimbot_feat;
-  g_root.children[4] = &g_triggerbot_feat;
-  g_root.children[5] = &g_silentaim_feat;
-  g_root.child_count = 6;
+  g_root.children[2] = &g_jumpbug_feat;
+  g_root.children[3] = &g_esp_feat;
+  g_root.children[4] = &g_aimbot_feat;
+  g_root.children[5] = &g_triggerbot_feat;
+  g_root.children[6] = &g_silentaim_feat;
+  g_root.child_count = 7;
 }
 
 static int g_depth[48]; // depth of each visible row (for indentation)
@@ -295,6 +302,7 @@ static void config_save() {
   fprintf(f, "[bhop]\nactive=%d\nbind=%d\nautostrafe=%d\n", g_bhop.active,
           g_bhop.bind, g_bhop_autostrafe);
   fprintf(f, "[abh]\nactive=%d\nbind=%d\n", g_abh.active, g_abh.bind);
+  fprintf(f, "[jumpbug]\nactive=%d\n", g_jumpbug.active);
   fprintf(f, "[aimbot]\nactive=%d\nbind=%d\nsmooth=%d\nvischeck=%d\n"
              "fov=%d\nfov_circle=%d\n"
              "bone_head=%d\nbone_torso=%d\nbone_larm=%d\nbone_rarm=%d\n"
@@ -332,6 +340,8 @@ static void config_load() {
         cur = &g_bhop;
       else if (strstr(line, "[abh]"))
         cur = &g_abh;
+      else if (strstr(line, "[jumpbug]"))
+        cur = &g_jumpbug;
       else if (strstr(line, "[esp]"))
         cur = &g_esp;
       else if (strstr(line, "[aimbot]"))
@@ -516,10 +526,10 @@ static bool key_pressed(int sc) {
 // feature gate queried from hl2h.cpp do_move(): feature must be Active AND
 // its bind key held (always-on when unbound).
 static FeatureState *feature_state(int feature) {
-  static FeatureState *feats[6] = {&g_bhop,    &g_abh,     &g_esp,
-                                   &g_aimbot,  &g_triggerbot,
-                                   &g_silentaim};
-  if (feature < 0 || feature > 5)
+  static FeatureState *feats[7] = {&g_bhop,   &g_abh,        &g_esp,
+                                   &g_aimbot, &g_triggerbot, &g_silentaim,
+                                   &g_jumpbug};
+  if (feature < 0 || feature > 6)
     return nullptr;
   return feats[feature];
 }