Spread control: override the server FireBullets seed for the local player

The installed 2024 server ignores the client usercmd random_seed and uses its
own shot seed. Force the server's CBaseEntity::FireBullets RandomSeed call for
the local player only:

- hook the server.so RandomSeed GOT slot (R_386_JUMP_SLOT at 0xce1348);
- read the FireBullets `this` from the caller frame and compare it with the
  local server player base;
- replace the seed with the precomputed best single/shotgun window and step it
  per pellet; NPC shots and everything else pass through.
- client prediction still uses the same chosen usercmd seed, so both sides
  agree on the spread pattern.

1 files changed, 16 insertions, 3 deletions

diff --git a/src/esp.cpp b/src/esp.cpp
index 0117d27..ae08258 100644
--- a/src/esp.cpp
+++ b/src/esp.cpp
@@ -1057,6 +1057,7 @@ static bool g_spread_ready = false;
 static int g_spread_seed1 = 0;
 static int g_spread_seed8 = 0;  // first pellet exact, 7 spread
 static int g_spread_seed12 = 0; // all 12 spread
+int g_spread_pellets = 1;
 
 static void spread_compute() {
   using SeedFn = void (*)(int);
@@ -1163,9 +1164,11 @@ bool spread_control_apply(CUserCmd *cmd, void *local_ent) {
     return false;
 
   bool shotgun = active_weapon_is_shotgun(local_ent);
-  int seed = g_spread_seed1;
+  int pellets = 1;
   if (shotgun)
-    seed = (cmd->buttons & IN_ATTACK2) ? g_spread_seed12 : g_spread_seed8;
+    pellets = (cmd->buttons & IN_ATTACK2) ? 12 : 8;
+  g_spread_pellets = pellets;
+  int seed = spread_best_seed(pellets);
   if (cmd->random_seed == seed)
     return false;
   cmd->random_seed = seed;
@@ -1173,11 +1176,21 @@ bool spread_control_apply(CUserCmd *cmd, void *local_ent) {
   static int logs = 0;
   if (logs < 10) {
     logs++;
-    logf("spread: seed=%d (%s)", seed, shotgun ? "shotgun" : "single");
+    logf("spread: seed=%d pellets=%d", seed, pellets);
   }
   return true;
 }
 
+int spread_best_seed(int pellets) {
+  if (!g_spread_ready)
+    return 33;
+  if (pellets >= 12)
+    return g_spread_seed12;
+  if (pellets >= 8)
+    return g_spread_seed8;
+  return g_spread_seed1;
+}
+
 bool triggerbot_apply(CUserCmd *cmd) {
   if (!g_iface.enginetrace || !g_iface.entitylist)
     return false;