From 687b966c5eb736ae1311d9a6e1bcd97ed160a9dd Mon Sep 17 00:00:00 2001
From: Matthew Coppola <zenithofficialmail@gmail.com>
Date: Sat, 30 Nov 2024 20:29:11 -0500
Subject: [PATCH] Allow overriding g_TickRateDiv at runtime

---
 port/src/main.c        |  2 ++
 port/src/optionsmenu.c | 69 +++++++++++++++++++++++++++++++++++++++++-
 src/include/data.h     |  1 +
 3 files changed, 71 insertions(+), 1 deletion(-)

diff --git a/port/src/main.c b/port/src/main.c
index f8f6af13f..c745c0efb 100644
--- a/port/src/main.c
+++ b/port/src/main.c
@@ -36,6 +36,7 @@ u32 g_VmNumPageReplaces = 0;
 u8 g_VmShowStats = 0;
 
 s32 g_TickRateDiv = 1;
+s32 g_TickRateDivOverride = 0;
 s32 g_TickExtraSleep = true;
 
 s32 g_SkipIntro = false;
@@ -165,6 +166,7 @@ PD_CONSTRUCTOR static void gameConfigInit(void)
 	configRegisterInt("Game.MenuMouseControl", &g_MenuMouseControl, 0, 1);
 	configRegisterFloat("Game.ScreenShakeIntensity", &g_ViShakeIntensityMult, 0.f, 10.f);
 	configRegisterInt("Game.TickRateDivisor", &g_TickRateDiv, 0, 10);
+	configRegisterInt("Game.TickRateDivisorOverride", &g_TickRateDivOverride, 0, 1);
 	configRegisterInt("Game.ExtraSleep", &g_TickExtraSleep, 0, 1);
 	configRegisterInt("Game.SkipIntro", &g_SkipIntro, 0, 1);
 	configRegisterInt("Game.DisableMpDeathMusic", &g_MusicDisableMpDeath, 0, 1);
diff --git a/port/src/optionsmenu.c b/port/src/optionsmenu.c
index e26c8efcd..1d03bc169 100644
--- a/port/src/optionsmenu.c
+++ b/port/src/optionsmenu.c
@@ -775,7 +775,7 @@ static MenuItemHandlerResult menuhandlerFramerateLimit(s32 operation, struct men
 		data->slider.value = videoGetFramerateLimit();
 		break;
 	case MENUOP_SET:
-		if (g_TickRateDiv < 2) {
+		if (!g_TickRateDivOverride) {
 			g_TickRateDiv = (data->slider.value == 0 || data->slider.value > 60) ? 0 : 1;
 		}
 		videoSetFramerateLimit(data->slider.value);
@@ -960,6 +960,49 @@ static MenuItemHandlerResult menuhandlerGeMuzzleFlashes(s32 operation, struct me
 	return 0;
 }
 
+static MenuItemHandlerResult menuhandlerTickrateDivisorOverride(s32 operation, struct menuitem *item, union handlerdata *data)
+{
+	s32 framerateLimit;
+
+	switch (operation) {
+	case MENUOP_GET:
+		return g_TickRateDivOverride;
+	case MENUOP_SET:
+		g_TickRateDivOverride = data->checkbox.value;
+		if (!g_TickRateDivOverride) {
+			framerateLimit = videoGetFramerateLimit();
+			g_TickRateDiv = (framerateLimit == 0 || framerateLimit > 60) ? 0 : 1;
+		}
+	}
+
+	return 0;
+}
+
+static MenuItemHandlerResult menuhandlerTickrateDivisor(s32 operation, struct menuitem *item, union handlerdata *data)
+{
+	s32 framerateLimit;
+
+	switch (operation) {
+	case MENUOP_CHECKHIDDEN:
+		if (!g_TickRateDivOverride) {
+			return true;
+		}
+		break;
+	case MENUOP_GETSLIDER:
+		data->slider.value = g_TickRateDiv;
+		break;
+	case MENUOP_SET:
+		if (g_TickRateDivOverride) {
+			g_TickRateDiv = data->slider.value;
+		} else {
+			framerateLimit = videoGetFramerateLimit();
+			g_TickRateDiv = (framerateLimit == 0 || framerateLimit > 60) ? 0 : 1;
+		}
+	}
+
+	return 0;
+}
+
 static MenuItemHandlerResult menuhandlerCenterHUD(s32 operation, struct menuitem *item, union handlerdata *data)
 {
 	static const char *opts[] = {
@@ -1169,6 +1212,30 @@ struct menuitem g_ExtendedVideoMenuItems[] = {
 		0,
 		NULL,
 	},
+	{
+		MENUITEMTYPE_CHECKBOX,
+		0,
+		MENUITEMFLAG_LITERAL_TEXT,
+		(uintptr_t)"Override Tickrate Divisor",
+		0,
+		menuhandlerTickrateDivisorOverride,
+	},
+	{
+		MENUITEMTYPE_SLIDER,
+		0,
+		MENUITEMFLAG_LITERAL_TEXT | MENUITEMFLAG_SLIDER_WIDE,
+		(uintptr_t)"Tickrate Divisor",
+		10,
+		menuhandlerTickrateDivisor,
+	},
+	{
+		MENUITEMTYPE_SEPARATOR,
+		0,
+		0,
+		0,
+		0,
+		NULL,
+	},
 	{
 		MENUITEMTYPE_SELECTABLE,
 		0,
diff --git a/src/include/data.h b/src/include/data.h
index 24c106292..6a5148ca0 100644
--- a/src/include/data.h
+++ b/src/include/data.h
@@ -550,6 +550,7 @@ extern s32 g_BlurFb;
 extern s32 g_BlurFbCapTimer;
 extern bool g_BlurFbDirty;
 extern s32 g_TickRateDiv;
+extern s32 g_TickRateDivOverride;
 extern s32 g_TickExtraSleep;
 extern s32 g_MusicDisableMpDeath;
 extern s32 g_BgunGeMuzzleFlashes;