Aimbot: head-only nearest-to-crosshair with bounded smoothing

- select the hostile NPC whose (approximate) head is closest in angle to the
  crosshair, then refine to its actual head hitbox/bone
- aimbot menu feature (Active + Bind, default Mouse5, rebindable via the
  existing bind chooser); config [aimbot] active/bind
- never snap: move at most 5 degrees per tick toward the target, shortest-path
  yaw, pitch clamped to +/-89, 0.05 degree deadzone; no overshoot/oscillation
- fixes the usercmd CRC after modifying viewangles
- skip when dead; ignores friendly/neutral entities (crows, citizens, ...)

1 files changed, 117 insertions, 0 deletions

diff --git a/src/esp.cpp b/src/esp.cpp
index 34a702a..1cb8b70 100644
--- a/src/esp.cpp
+++ b/src/esp.cpp
@@ -316,6 +316,123 @@ static void draw_skeleton(const EspTarget &t) {
   }
 }
 
+// ---------------------------------------------------------------------------
+// aimbot v1: nearest hostile NPC head to the crosshair.
+// Bounded smoothing: never snap, never overshoot. Each tick moves at most
+// MAX_STEP degrees toward the target and stops inside DEADZONE.
+// ---------------------------------------------------------------------------
+
+static QAngle angle_to(const Vector &from, const Vector &to) {
+  float dx = to.x - from.x, dy = to.y - from.y, dz = to.z - from.z;
+  float horiz = sqrtf(dx * dx + dy * dy);
+  if (horiz < 0.001f)
+    horiz = 0.001f;
+  QAngle a{};
+  a.x = -atan2f(dz, horiz) * 180.0f / PI_F; // Source: positive pitch = down
+  a.y = atan2f(dy, dx) * 180.0f / PI_F;
+  a.z = 0.0f;
+  return a;
+}
+
+bool aimbot_apply(CUserCmd *cmd) {
+  if (!g_iface.entitylist || g_net.origin < 0 || g_net.maxs < 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;
+
+  QAngle view{cmd->viewangles[0], cmd->viewangles[1], 0.0f};
+
+  using Fn = int (*)(void *);
+  int hi = vfunc<Fn>(g_iface.entitylist, 6)(g_iface.entitylist);
+  if (hi < 0 || hi > 4096)
+    hi = 4096;
+
+  constexpr float MAX_FOV = 60.0f; // only things near the crosshair
+  float best_fov = MAX_FOV;
+  int best_idx = -1;
+  Vector best_head{};
+
+  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;
+
+    float maxz = g_net.maxs >= 0 ? *(float *)(e + g_net.maxs + 8) : 72.0f;
+    if (!(maxz > 4.0f && maxz < 512.0f))
+      maxz = 72.0f;
+    Vector origin{*(float *)(e + g_net.origin),
+                  *(float *)(e + g_net.origin + 4),
+                  *(float *)(e + g_net.origin + 8)};
+    Vector approx{origin.x, origin.y, origin.z + maxz * 0.9f};
+    float fov = getfov(view, angle_to(g_cam_eye, approx));
+    if (fov >= best_fov)
+      continue;
+    best_fov = fov;
+    best_idx = idx;
+    best_head = approx;
+  }
+
+  if (best_idx < 0)
+    return false;
+
+  // Refine to the actual head hitbox/bone for the chosen target only.
+  void *best_ent = entitylist_get(best_idx);
+  if (best_ent && bones_update(best_idx, best_ent)) {
+    Vector head;
+    if (head_position(best_idx, head) &&
+        getfov(view, angle_to(g_cam_eye, head)) <= MAX_FOV)
+      best_head = head;
+  }
+
+  QAngle desired = angle_to(g_cam_eye, best_head);
+  float dp = desired.x - cmd->viewangles[0];
+  float dy = desired.y - cmd->viewangles[1];
+  while (dy > 180.0f) dy -= 360.0f;
+  while (dy < -180.0f) dy += 360.0f;
+
+  constexpr float DEADZONE = 0.05f;
+  constexpr float MAX_STEP = 5.0f;
+  float maxd = fmaxf(fabsf(dp), fabsf(dy));
+  if (maxd <= DEADZONE)
+    return false;
+
+  float scale = (maxd > MAX_STEP) ? (MAX_STEP / maxd) : 1.0f;
+  float np = cmd->viewangles[0] + dp * scale;
+  float ny = cmd->viewangles[1] + dy * scale;
+  if (np > 89.0f) np = 89.0f;
+  if (np < -89.0f) np = -89.0f;
+  while (ny > 180.0f) ny -= 360.0f;
+  while (ny < -180.0f) ny += 360.0f;
+  cmd->viewangles[0] = np;
+  cmd->viewangles[1] = ny;
+  return true;
+}
+
 void esp_draw() {
   if (!g_surface || !g_iface.entitylist || !g_net.esp_ok()) return;
   if (!g_scr_w) {