From 643538ab5a6a098de6f2b0d8c2ef8004996d8fb0 Mon Sep 17 00:00:00 2001
From: Sally Coolatta <tehrealsalt@gmail.com>
Date: Thu, 28 Dec 2023 22:10:40 -0500
Subject: [PATCH] Use deterministic RNG seed for Time Attack

Based off of the hash from the map's lump name.
---
 src/g_game.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/g_game.c b/src/g_game.c
index 316280198..7e99e70c8 100644
--- a/src/g_game.c
+++ b/src/g_game.c
@@ -5882,7 +5882,18 @@ void G_InitNew(UINT8 pencoremode, INT32 map, boolean resetplayer, boolean skippr
 	comebackshowninfo = false;
 
 	if (!demo.playback && !netgame) // Netgame sets random seed elsewhere, demo playback sets seed just before us!
-		P_ClearRandom(M_RandomizedSeed()); // Use a more "Random" random seed
+	{
+		if (modeattacking != ATTACKING_NONE && mapheaderinfo[map-1]->lumpnum != LUMPERROR)
+		{
+			// Use deterministic starting RNG for Time Attack
+			P_ClearRandom(mapheaderinfo[map-1]->lumpnamehash);
+		}
+		else
+		{
+			// Use a more "Random" random seed
+			P_ClearRandom(M_RandomizedSeed());
+		}
+	}
 
 	// Clear a bunch of variables
 	redscore = bluescore = lastmap = 0;