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, 20 insertions, 2 deletions

diff --git a/src/server.cpp b/src/server.cpp
index 3766906..896ce3e 100644
--- a/src/server.cpp
+++ b/src/server.cpp
@@ -33,6 +33,7 @@ int g_srv_lifestate = -1;
 int g_srv_modelindex = -1;
 int g_srv_absvelocity = -1;
 int g_srv_velocity = -1;
+int g_srv_activeweapon = -1;
 static bool g_srv_ready = false;
 static bool g_srv_checked = false;
 
@@ -109,12 +110,14 @@ bool resolve_server_netvars() {
   g_srv_modelindex = datamap_offset("m_nModelIndex", 7); // FIELD_SHORT
   g_srv_absvelocity = datamap_offset("m_vecAbsVelocity", 3); // FIELD_VECTOR
   g_srv_velocity = datamap_offset("m_vecVelocity", 3);       // FIELD_VECTOR
+  g_srv_activeweapon = datamap_offset("m_hActiveWeapon", 13); // FIELD_EHANDLE
   g_srv_ready = g_srv_health > 0;
   if (g_srv_ready) {
     logf("server datamap (%s): health=%d maxhealth=%d lifeste=%d "
-         "modelindex=%d absvel=%d vel=%d",
+         "modelindex=%d absvel=%d vel=%d activeweapon=%d",
          g_server.path.c_str(), g_srv_health, g_srv_maxhealth, g_srv_lifestate,
-         g_srv_modelindex, g_srv_absvelocity, g_srv_velocity);
+         g_srv_modelindex, g_srv_absvelocity, g_srv_velocity,
+         g_srv_activeweapon);
     fail_logged = false;
   } else if (!fail_logged) {
     fail_logged = true;
@@ -194,3 +197,18 @@ bool server_set_velocity_z(int idx, float vz) {
   *(float *)((uintptr_t)base + g_srv_absvelocity + 8) = vz;
   return true;
 }
+
+// Entity index of the player's active weapon from the authoritative server
+// entity. Used as a fallback if the client m_hActiveWeapon netvar is missing.
+int server_active_weapon(int idx) {
+  if (!g_srv_ready || !g_iface.engineserver || g_srv_activeweapon <= 0)
+    return -1;
+  void *base = nullptr;
+  if (server_entity_health(idx, nullptr, nullptr, &base) < 0 || !base)
+    return -1;
+  uint32_t h = *(uint32_t *)((uintptr_t)base + g_srv_activeweapon);
+  if (h == 0xFFFFFFFFu)
+    return -1;
+  int wi = (int)(h & 0xFFFF);
+  return (wi > 0 && wi <= 4096) ? wi : -1;
+}