From cb4d9b527e3188b0ba1740593fb2cc8f97d876e5 Mon Sep 17 00:00:00 2001
From: toaster <rollerorbital@gmail.com>
Date: Wed, 22 Mar 2023 23:34:01 +0000
Subject: [PATCH] musicdef_t: Add `hash` field

Slight optimisation for S_FindMusicDef, but will net us some big wins with our next feature.
---
 src/s_sound.c | 17 ++++++++++-------
 src/s_sound.h |  1 +
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/src/s_sound.c b/src/s_sound.c
index d3f9f5472..f099fee2d 100644
--- a/src/s_sound.c
+++ b/src/s_sound.c
@@ -1368,16 +1368,18 @@ struct cursongcredit cursongcredit; // Currently displayed song credit info
 //
 musicdef_t *S_FindMusicDef(const char *name)
 {
-	musicdef_t *def = musicdefstart;
+	UINT32 hash = quickncasehash (name, 6);
+	musicdef_t *def;
 
-	while (def)
+	for (def = musicdefstart; def; def = def->next)
 	{
-		if (!stricmp(def->name, name))
-		{
-			return def;
-		}
+		if (hash != def->hash)
+			continue;
 
-		def = def->next;
+		if (stricmp(def->name, name))
+			continue;
+
+		return def;
 	}
 
 	return NULL;
@@ -1439,6 +1441,7 @@ ReadMusicDefFields
 
 				STRBUFCPY(def->name, value);
 				strlwr(def->name);
+				def->hash = quickncasehash (def->name, 6);
 				def->volume = DEFAULT_MUSICDEF_VOLUME;
 
 				def->next = musicdefstart;
diff --git a/src/s_sound.h b/src/s_sound.h
index 15c1445a3..270517ca1 100644
--- a/src/s_sound.h
+++ b/src/s_sound.h
@@ -178,6 +178,7 @@ boolean S_SpeedMusic(float speed);
 struct musicdef_t
 {
 	char name[7];
+	UINT32 hash;
 	char *title;
 	char *author;
 	char *source;