Melee killbot: 360-degree crowbar silent aim

- New feature (default on): while the local player's active weapon is the
  crowbar, pick the nearest visible hostile NPC within the 75-unit crowbar
  range, sorted by distance to its collision AABB, and attack it through the
  normal silent-aim path (usercmd view + IN_ATTACK, movement preserved,
  rendered view restored at FRAME_RENDER_START).
- Prefer the nearest visible hitbox center; fall back to the AABB center /
  closest point when bones are unavailable. Reuses the existing friendly /
  neutral and life-state filters and the world-only vischeck.
- Detect the active weapon from the client m_hActiveWeapon handle, with the
  authoritative server m_hActiveWeapon handle as a fallback (client entity
  index from the low 16 bits).
- While the crowbar is active and this feature is on, skip the gun aimbot,
  triggerbot and silent aim so they do not fight over the usercmd view.
- Menu: Melee killbot -> Active; config [melee] active=...

1 files changed, 258 insertions, 0 deletions

diff --git a/src/esp.cpp b/src/esp.cpp
index 1e00a92..47df57d 100644
--- a/src/esp.cpp
+++ b/src/esp.cpp
@@ -784,6 +784,264 @@ bool silent_aim_apply(CUserCmd *cmd) {
   return true;
 }
 
+// ---------------------------------------------------------------------------
+// melee killbot
+// ---------------------------------------------------------------------------
+//
+// The crowbar's CBaseHLBludgeonWeapon::Swing traces 75 units from
+// Weapon_ShootPosition along the view forward (CROWBAR_RANGE in
+// weapon_crowbar.h). It first tries a line, then a +/-16 hull backed off by
+// ~28 units, and ignores targets more than ~45 degrees off the aim direction.
+// We therefore only need to point the usercmd at the target for one command;
+// the rendered view is restored exactly like silent aim.
+
+static constexpr float MELEE_RANGE = 75.0f;
+
+static float vec_dist(const Vector &a, const Vector &b) {
+  float dx = a.x - b.x, dy = a.y - b.y, dz = a.z - b.z;
+  return sqrtf(dx * dx + dy * dy + dz * dz);
+}
+
+bool melee_weapon_active(void *local_ent) {
+  if (!local_ent)
+    return false;
+  int local = engine_get_local_player();
+
+  auto check = [&](int idx, const char **cls_out,
+                   const char **model_out) -> bool {
+    if (idx <= 0 || idx > 4096)
+      return false;
+    void *wep = entitylist_get(idx);
+    void *net = entity_networkable(idx);
+    const char *cls = net ? entity_class_name(net, nullptr) : nullptr;
+    const char *model = wep ? entity_model_name(wep) : nullptr;
+    *cls_out = cls;
+    *model_out = model;
+    return (cls && strstr(cls, "Crowbar")) ||
+           (model && strstr(model, "crowbar"));
+  };
+
+  int idx = -1;
+  if (g_net.activeweapon >= 0) {
+    uint32_t h = *(uint32_t *)((uintptr_t)local_ent + g_net.activeweapon);
+    if (h != 0xFFFFFFFFu)
+      idx = (int)(h & 0xFFFF);
+  }
+  const char *cls = nullptr, *model = nullptr;
+  bool crowbar = check(idx, &cls, &model);
+
+  if (!crowbar) {
+    // Fallback: the authoritative server player's m_hActiveWeapon handle.
+    // Also covers a client netvar offset that resolves but does not point at
+    // the weapon the server is actually using.
+    if (local > 0) {
+      resolve_server_netvars();
+      int si = server_active_weapon(local);
+      if (si > 0 && si != idx) {
+        idx = si;
+        crowbar = check(idx, &cls, &model);
+      }
+    }
+  }
+
+  static int last_idx = -2;
+  static bool last_crowbar = false;
+  if (idx != last_idx || crowbar != last_crowbar) {
+    last_idx = idx;
+    last_crowbar = crowbar;
+    logf("melee: active idx=%d cls=%s model=%s crowbar=%d", idx,
+         cls ? cls : "?", model ? model : "?", (int)crowbar);
+  }
+  return crowbar;
+}
+
+bool melee_aimbot_apply(CUserCmd *cmd) {
+  if (!g_iface.entitylist || g_net.origin < 0)
+    return false;
+  int local = engine_get_local_player();
+  if (local <= 0)
+    return false;
+  void *local_ent = entitylist_get(local);
+  if (!local_ent)
+    return false;
+  if (g_net.health >= 0 &&
+      *(int *)((uintptr_t)local_ent + g_net.health) <= 0)
+    return false;
+
+  using Fn = int (*)(void *);
+  int hi = vfunc<Fn>(g_iface.entitylist, 6)(g_iface.entitylist);
+  if (hi < 0 || hi > 4096)
+    hi = 4096;
+
+  struct Cand {
+    int idx;
+    float dist;
+    Vector closest;
+    Vector center;
+  };
+  Cand cands[16];
+  int n = 0;
+
+  for (int idx = 1; idx <= hi; idx++) {
+    if (idx == local)
+      continue;
+    void *ent = entitylist_get(idx);
+    if (!ent)
+      continue;
+    void *net = entity_networkable(idx);
+    if (!net)
+      continue;
+    const char *cls = entity_class_name(net, nullptr);
+    if (!cls || !is_npc_class(cls))
+      continue;
+    uintptr_t e = (uintptr_t)ent;
+    int life = g_net.lifestate >= 0
+                   ? (int)*(unsigned char *)(e + g_net.lifestate)
+                   : -1;
+    if (life != LIFE_ALIVE)
+      continue;
+    const char *model = entity_model_name(ent);
+    if (model_is_friendly(model) || model_is_neutral(model))
+      continue;
+
+    Vector origin{*(float *)(e + g_net.origin),
+                  *(float *)(e + g_net.origin + 4),
+                  *(float *)(e + g_net.origin + 8)};
+    float minx = -16.0f, miny = -16.0f, minz = 0.0f;
+    float maxx = 16.0f, maxy = 16.0f, maxz = 72.0f;
+    if (g_net.mins >= 0) {
+      minx = *(float *)(e + g_net.mins);
+      miny = *(float *)(e + g_net.mins + 4);
+      minz = *(float *)(e + g_net.mins + 8);
+    }
+    if (g_net.maxs >= 0) {
+      maxx = *(float *)(e + g_net.maxs);
+      maxy = *(float *)(e + g_net.maxs + 4);
+      maxz = *(float *)(e + g_net.maxs + 8);
+    }
+    if (!(maxz > minz + 4.0f && maxz < 512.0f)) {
+      minz = 0.0f;
+      maxz = 72.0f;
+    }
+    if (!(maxx > minx + 1.0f && maxx < 256.0f)) {
+      minx = -16.0f;
+      maxx = 16.0f;
+    }
+    if (!(maxy > miny + 1.0f && maxy < 256.0f)) {
+      miny = -16.0f;
+      maxy = 16.0f;
+    }
+
+    Vector lo{origin.x + minx, origin.y + miny, origin.z + minz};
+    Vector hiV{origin.x + maxx, origin.y + maxy, origin.z + maxz};
+    Vector closest{g_cam_eye.x, g_cam_eye.y, g_cam_eye.z};
+    if (closest.x < lo.x) closest.x = lo.x;
+    if (closest.x > hiV.x) closest.x = hiV.x;
+    if (closest.y < lo.y) closest.y = lo.y;
+    if (closest.y > hiV.y) closest.y = hiV.y;
+    if (closest.z < lo.z) closest.z = lo.z;
+    if (closest.z > hiV.z) closest.z = hiV.z;
+    float d = vec_dist(g_cam_eye, closest);
+    if (d > MELEE_RANGE)
+      continue;
+
+    Vector center{(lo.x + hiV.x) * 0.5f, (lo.y + hiV.y) * 0.5f,
+                  (lo.z + hiV.z) * 0.5f};
+
+    int pos = n;
+    while (pos > 0 && cands[pos - 1].dist > d)
+      pos--;
+    if (n < 16)
+      n++;
+    else if (pos >= 16)
+      continue;
+    for (int j = n - 1; j > pos; j--)
+      cands[j] = cands[j - 1];
+    cands[pos] = {idx, d, closest, center};
+  }
+
+  for (int ci = 0; ci < n; ci++) {
+    const Cand &c = cands[ci];
+    Vector aim{};
+    bool have_aim = false;
+
+    // Prefer the nearest visible hitbox center. This handles small NPCs
+    // (headcrabs, antlions) whose AABB center can be less useful than the
+    // actual body hitboxes.
+    void *tent = entitylist_get(c.idx);
+    if (tent && bones_update(c.idx, tent)) {
+      Vector pts[32];
+      int np = aim_points(c.idx, 0xFE, pts, 32);
+      float bestd = 1e9f;
+      for (int i = 0; i < np; i++) {
+        float pd = vec_dist(g_cam_eye, pts[i]);
+        if (pd > MELEE_RANGE || pd >= bestd)
+          continue;
+        if (!is_visible(g_cam_eye, pts[i]))
+          continue;
+        bestd = pd;
+        aim = pts[i];
+        have_aim = true;
+      }
+    }
+
+    if (!have_aim) {
+      aim = c.center;
+      float ad = vec_dist(g_cam_eye, aim);
+      if (ad > MELEE_RANGE) {
+        // The body is in range but its center is not: aim just inside the
+        // closest point on the AABB.
+        aim = c.closest;
+        aim.x += (c.center.x - c.closest.x) * 0.25f;
+        aim.y += (c.center.y - c.closest.y) * 0.25f;
+        aim.z += (c.center.z - c.closest.z) * 0.25f;
+        ad = vec_dist(g_cam_eye, aim);
+        if (ad > MELEE_RANGE)
+          aim = c.closest;
+      }
+      if (!is_visible(g_cam_eye, aim))
+        continue;
+    }
+
+    QAngle orig{g_cam_view.x, g_cam_view.y, g_cam_view.z};
+    QAngle desired = angle_to(g_cam_eye, aim);
+    float np = desired.x;
+    if (np > 89.0f) np = 89.0f;
+    if (np < -89.0f) np = -89.0f;
+    float ny = desired.y;
+    while (ny > 180.0f) ny -= 360.0f;
+    while (ny < -180.0f) ny += 360.0f;
+
+    preserve_movement(cmd, orig.y, ny);
+    cmd->viewangles[0] = np;
+    cmd->viewangles[1] = ny;
+    cmd->viewangles[2] = orig.z;
+    set_silent_restore(orig);
+    if (g_iface.engine) {
+      QAngle restore{orig.x, orig.y, orig.z};
+      using SetViewFn = void (*)(void *, QAngle *);
+      vfunc<SetViewFn>(g_iface.engine, 20)(g_iface.engine, &restore);
+    }
+    cmd->buttons |= IN_ATTACK;
+
+    static int logs = 0;
+    if (logs < 10) {
+      logs++;
+      logf("melee: swing idx=%d dist=%.1f aim=(%.1f %.1f %.1f)", c.idx,
+           c.dist, aim.x, aim.y, aim.z);
+    }
+    return true;
+  }
+
+  static double last_none = 0.0;
+  double now = esp_now();
+  if (now - last_none >= 2.0) {
+    last_none = now;
+    logf("melee: no visible target within %.0f", MELEE_RANGE);
+  }
+  return false;
+}
+
 bool triggerbot_apply(CUserCmd *cmd) {
   if (!g_iface.enginetrace || !g_iface.entitylist)
     return false;