From 8bb3482bc5b3917ffd393cb9f876febbb77a6647 Mon Sep 17 00:00:00 2001
From: yamamama <anonimus.srb2k@gmail.com>
Date: Fri, 26 Dec 2025 01:12:18 -0500
Subject: [PATCH] Expose the Arrow Bullet scalar to Lua

Very much for prototyping reasons
---
 src/lua_baselib.c | 12 ++++++++++++
 src/p_local.h     |  1 +
 src/p_user.c      | 14 +++++++++++---
 3 files changed, 24 insertions(+), 3 deletions(-)

diff --git a/src/lua_baselib.c b/src/lua_baselib.c
index 5d3b23003..f07c9b597 100644
--- a/src/lua_baselib.c
+++ b/src/lua_baselib.c
@@ -1497,6 +1497,17 @@ static int lib_pNukeEnemies(lua_State *L)
 	return 0;
 }
 
+static int lib_pKartAltShrinkAuraScalar(lua_State *L)
+{
+	player_t *player = *((player_t **)luaL_checkudata(L, 1, META_PLAYER));
+	//HUDSAFE
+	if (!player)
+		return LUA_ErrInvalid(L, "player_t");
+
+	lua_pushinteger(L, P_KartAltShrinkAuraScalar(player));
+	return 1;
+}
+
 // P_MAP
 ///////////
 
@@ -5517,6 +5528,7 @@ static luaL_Reg lib[] = {
 	{"P_ReturnThrustX",lib_pReturnThrustX},
 	{"P_ReturnThrustY",lib_pReturnThrustY},
 	{"P_NukeEnemies",lib_pNukeEnemies},
+	{"P_KartAltShrinkAuraScalar", lib_pKartAltShrinkAuraScalar},
 
 	// p_map
 	{"P_CheckPosition",lib_pCheckPosition},
diff --git a/src/p_local.h b/src/p_local.h
index 847042a24..6db4dfb3d 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -215,6 +215,7 @@ void P_HaltPlayerOrbit(player_t *player);
 void P_ExitPlayerOrbit(player_t *player);
 boolean P_PlayerOrbit(player_t *player);
 
+fixed_t P_KartAltShrinkAuraScalar(player_t *player);
 void P_MovePlayer(player_t *player);
 void P_PlayerThink(player_t *player);
 void P_PlayerAfterThink(player_t *player);
diff --git a/src/p_user.c b/src/p_user.c
index 62d7010a8..eb1997e52 100644
--- a/src/p_user.c
+++ b/src/p_user.c
@@ -2181,6 +2181,16 @@ static void P_UpdatePlayerAngle(player_t *player)
 	P_UpdatePlayerAiming(player);
 }
 
+#define MINAURAPCT (cv_kartaltshrink_arrowbulletthres.value - (FRACUNIT / 4))
+#define AURA_DIFF (max(1, (FRACUNIT << 1) - MINAURAPCT))
+fixed_t P_KartAltShrinkAuraScalar(player_t *player)
+{
+	if ((!player) || (!player->mo) || (P_MobjWasRemoved(player->mo)))
+		return 0;
+
+	return FixedDiv(min(max(0, K_GetSpeedPercentage(player) - MINAURAPCT), (FRACUNIT << 1)), AURA_DIFF);
+}
+
 //
 // P_MovePlayer
 void P_MovePlayer(player_t *player)
@@ -2317,12 +2327,10 @@ void P_MovePlayer(player_t *player)
 		K_SpawnSparkleTrail(player->mo);
 	}
 
-#define MINAURAPCT (cv_kartaltshrink_arrowbulletthres.value - (FRACUNIT / 4))
-#define AURA_DIFF (max(1, (FRACUNIT << 1) - MINAURAPCT))
 	// The Arrow Bullet aura should spawn before you actually enter the Arrow Bullet state.
 	if (cv_kartaltshrink_arrowbullet.value && K_IsAltShrunk(player) && (K_GetSpeedPercentage(player) >= MINAURAPCT))
 	{
-		fixed_t aura_scalar = FixedDiv(min(max(0, K_GetSpeedPercentage(player) - MINAURAPCT), (FRACUNIT << 1)), AURA_DIFF);
+		fixed_t aura_scalar = P_KartAltShrinkAuraScalar(player);
 
 		INT32 auravis = 10 - FixedMul(7, Easing_OutCubic(aura_scalar, 0, FRACUNIT));
 		auravis = min(9, max(1, auravis)) << FF_TRANSSHIFT;