From 8d120b8a4db1411c4a21245dec80cb2221c0fc5c Mon Sep 17 00:00:00 2001
From: kichikuou <KichikuouChrome@gmail.com>
Date: Fri, 13 Jun 2025 12:53:45 +0900
Subject: [PATCH] 3d: Avoid zero division in update_motion()

---
 src/3d/reign.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/3d/reign.c b/src/3d/reign.c
index 276292a..b4da982 100644
--- a/src/3d/reign.c
+++ b/src/3d/reign.c
@@ -131,7 +131,9 @@ static void update_motion(struct motion *m, float delta_frame)
 		}
 		break;
 	case RE_MOTION_STATE_LOOP:
-		if (m->current_frame > m->loop_frame_end)
+		if (m->loop_frame_begin == m->loop_frame_end)
+			m->current_frame = m->loop_frame_begin;
+		else if (m->current_frame > m->loop_frame_end)
 			m->current_frame = m->loop_frame_begin + fmodf(m->current_frame - m->loop_frame_begin, m->loop_frame_end - m->loop_frame_begin);
 		break;
 	default: