From fa09b0059f3ffcc7b9e853f330e832ea75d74502 Mon Sep 17 00:00:00 2001
From: Nunuhara Cabbage <nunuhara@haniwa.technology>
Date: Tue, 25 Aug 2026 18:48:58 -0700
Subject: [PATCH] Implement PartsEngine.SetSpeedupRateByMessageSkip

Speeds up animations while message skipping.
---
 src/parts/motion.c | 15 ++++++++++++---
 src/parts/parts.c  |  6 ------
 2 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/src/parts/motion.c b/src/parts/motion.c
index 9ef8883..4810aea 100644
--- a/src/parts/motion.c
+++ b/src/parts/motion.c
@@ -537,12 +537,21 @@ void PE_SeekEndMotion(void)
 	PE_SetMotionTime(motion_end_t - 1);
 }
 
-void PE_UpdateMotionTime(int time, possibly_unused bool skip)
+static int msgskip_speedup_rate = 1;
+
+void PE_UpdateMotionTime(int time, bool skip)
 {
-	// TODO: use skip
 	if (is_motion_paused)
 		return;
-	PE_SetMotionTime(motion_t + time);
+	if (skip)
+		PE_SetMotionTime(motion_t + time * msgskip_speedup_rate);
+	else
+		PE_SetMotionTime(motion_t + time);
+}
+
+void PE_SetSpeedupRateByMessageSkip(int parts_no, int rate)
+{
+	msgskip_speedup_rate = max(1, rate);
 }
 
 bool PE_IsMotion(void)
diff --git a/src/parts/parts.c b/src/parts/parts.c
index e63cd55..5242edb 100644
--- a/src/parts/parts.c
+++ b/src/parts/parts.c
@@ -2101,12 +2101,6 @@ bool PE_IsExist(int parts_no)
 	return !!ht_get_int(parts_table, parts_no, NULL);
 }
 
-void PE_SetSpeedupRateByMessageSkip(int parts_no, int rate)
-{
-	if (rate != 1)
-		UNIMPLEMENTED("(%d, %d)");
-}
-
 static void ctrl_stack_init(void)
 {
 	memset(&ctrl_stack, 0, sizeof(ctrl_stack));