Spread control: client-seed no-spread

HL2's CBaseEntity::FireBullets seeds its RNG from the usercmd random_seed
(m_bUseServerRandomSeed is false for HL2 weapons), so the client can select the
8-bit seed that puts CShotManipulator::ApplySpread closest to the center.

- New feature Spread control -> Active / No spread (both default on).
- Precompute the best seed for a single shot and for the shotgun's 8-shot
  primary (first pellet accurate) and 12-shot secondary windows using the
  engine's own RandomSeed/RandomFloat from libvstdlib.
- Set cmd->random_seed on attack commands; note_modified repairs the CRC.
- The random cone offset is neutralized, but the cone size, the pistol
  accuracy penalty, server view punch and any damage falloff remain
  server-side; stock HL2 has no distance damage falloff.

1 files changed, 5 insertions, 2 deletions

diff --git a/src/hl2h.h b/src/hl2h.h
index 2680591..ef8e8d6 100644
--- a/src/hl2h.h
+++ b/src/hl2h.h
@@ -129,7 +129,7 @@ struct CUserCmd {
 // engine constants
 // ---------------------------------------------------------------------------
 
-enum { IN_ATTACK = 1 << 0, IN_JUMP = 1 << 1, IN_DUCK = 1 << 2, IN_USE = 1 << 5 };
+enum { IN_ATTACK = 1 << 0, IN_JUMP = 1 << 1, IN_DUCK = 1 << 2, IN_USE = 1 << 5, IN_ATTACK2 = 1 << 11 };
 enum { FL_ONGROUND = 1 << 0, FL_DUCKING = 1 << 1, FL_INWATER = 1 << 9 };
 enum { MOVETYPE_WALK = 2, MOVETYPE_NOCLIP = 8, MOVETYPE_LADDER = 9 };
 
@@ -150,6 +150,7 @@ bool triggerbot_apply(CUserCmd *cmd);
 bool silent_aim_apply(CUserCmd *cmd);
 bool melee_weapon_active(void *local_ent);
 bool melee_aimbot_apply(CUserCmd *cmd);
+bool spread_control_apply(CUserCmd *cmd, void *local_ent);
 enum FeatureId {
   FEAT_BHOP = 0,
   FEAT_ABH = 1,
@@ -158,7 +159,8 @@ enum FeatureId {
   FEAT_TRIGGERBOT = 4,
   FEAT_SILENTAIM = 5,
   FEAT_JUMPBUG = 6,
-  FEAT_MELEE = 7
+  FEAT_MELEE = 7,
+  FEAT_SPREAD = 8
 };
 enum EspOption {
   ESP_OPT_SHOW_NEUTRAL = 0,
@@ -193,6 +195,7 @@ bool feature_bind_held(int feature);
 bool esp_option(int opt);
 bool bhop_autostrafe_enabled();
 bool jumpbug_assist_enabled();
+bool spread_no_spread_enabled();
 unsigned aimbot_bone_mask();
 int aimbot_smooth_step();
 bool aimbot_vischeck_enabled();