From b2338179d6135492b2e17cba5ed51a2d37946636 Mon Sep 17 00:00:00 2001
From: fgsfds <derp.primus@gmail.com>
Date: Sat, 23 Nov 2024 12:14:03 +0100
Subject: [PATCH] port: don't uncrouch in spaces where we don't fit when using
 extended controls

---
 src/game/bondmove.c         |  5 +++
 src/game/bondwalk.c         | 76 +++++++++++++++++++++++++++++++++++++
 src/include/game/bondwalk.h |  2 +
 3 files changed, 83 insertions(+)

diff --git a/src/game/bondmove.c b/src/game/bondmove.c
index 80f560d25..f82e88dee 100644
--- a/src/game/bondmove.c
+++ b/src/game/bondmove.c
@@ -1583,6 +1583,7 @@ void bmoveProcessInput(bool allowc1x, bool allowc1y, bool allowc1buttons, bool i
 						}
 
 						// Handle xbla-style crouch cycling
+						const s32 oldcrouchpos = g_Vars.currentplayer->crouchpos;
 						for (i = 0; i < numsamples; i++) {
 							// handle 1964GEPD style crouch setting
 							s32 crouchsample;
@@ -1624,6 +1625,10 @@ void bmoveProcessInput(bool allowc1x, bool allowc1y, bool allowc1buttons, bool i
 								}
 							}
 						}
+						// prevent uncrouching if we don't fit
+						while (g_Vars.currentplayer->crouchpos > oldcrouchpos && !bwalkCanUncrouch()) {
+							g_Vars.currentplayer->crouchpos--;
+						}
 					}
 #endif
 
diff --git a/src/game/bondwalk.c b/src/game/bondwalk.c
index e33d60a83..dd72dcdac 100644
--- a/src/game/bondwalk.c
+++ b/src/game/bondwalk.c
@@ -237,6 +237,47 @@ s32 bwalkTryMoveUpwards(f32 amount)
 	return result;
 }
 
+bool bwalkCanMoveUpwards(f32 amount)
+{
+	bool result;
+	struct coord newpos;
+	RoomNum rooms[8];
+	u32 stack;
+	u32 types;
+	f32 ymax;
+	f32 ymin;
+	f32 radius;
+
+	if (g_Vars.currentplayer->floorflags & GEOFLAG_SLOPE) {
+		g_Vars.enableslopes = false;
+	} else {
+		g_Vars.enableslopes = true;
+	}
+
+	newpos.x = g_Vars.currentplayer->prop->pos.x;
+	newpos.y = g_Vars.currentplayer->prop->pos.y + amount;
+	newpos.z = g_Vars.currentplayer->prop->pos.z;
+
+	types = g_Vars.bondcollisions ? CDTYPE_ALL : CDTYPE_BG;
+
+	playerGetBbox(g_Vars.currentplayer->prop, &radius, &ymax, &ymin);
+	func0f065e74(&g_Vars.currentplayer->prop->pos, g_Vars.currentplayer->prop->rooms, &newpos, rooms);
+	bmoveFindEnteredRoomsByPos(g_Vars.currentplayer, &newpos, rooms);
+	propSetPerimEnabled(g_Vars.currentplayer->prop, false);
+
+	ymin -= 0.1f;
+
+	result = cdTestVolume(&newpos, radius, rooms, types, CHECKVERTICAL_YES,
+			ymax - g_Vars.currentplayer->prop->pos.y,
+			ymin - g_Vars.currentplayer->prop->pos.y);
+
+	propSetPerimEnabled(g_Vars.currentplayer->prop, true);
+
+	g_Vars.enableslopes = true;
+
+	return (result == CDRESULT_NOCOLLISION);
+}
+
 bool bwalkCalculateNewPosition(struct coord *vel, f32 rotateamount, bool apply, f32 extrawidth, s32 checktypes)
 {
 	s32 result = CDRESULT_NOCOLLISION;
@@ -1168,6 +1209,41 @@ void bwalkUpdateCrouchOffsetReal(void)
 	}
 }
 
+bool bwalkCanUncrouch(void)
+{
+	f32 targetoffset = 0;
+
+	if (g_Vars.currentplayer->crouchpos == CROUCHPOS_SQUAT) {
+		targetoffset = -90;
+	} else if (g_Vars.currentplayer->crouchpos == CROUCHPOS_DUCK) {
+		targetoffset = -45;
+	}
+
+	if (targetoffset != g_Vars.currentplayer->crouchoffset) {
+		f32 prevcrouchoffset = g_Vars.currentplayer->crouchoffset;
+		f32 prevcrouchoffsetreal = g_Vars.currentplayer->crouchoffsetreal;
+		f32 prevcrouchoffsetsmall = g_Vars.currentplayer->crouchoffsetsmall;
+		f32 prevcrouchoffsetrealsmall = g_Vars.currentplayer->crouchoffsetrealsmall;
+		f32 prevcrouchspeed = g_Vars.currentplayer->crouchspeed;
+
+		g_Vars.currentplayer->crouchoffset = targetoffset;
+
+		bwalkUpdateCrouchOffsetReal();
+
+		const bool result = bwalkCanMoveUpwards(0);
+
+		g_Vars.currentplayer->crouchoffset = prevcrouchoffset;
+		g_Vars.currentplayer->crouchoffsetreal = prevcrouchoffsetreal;
+		g_Vars.currentplayer->crouchoffsetsmall = prevcrouchoffsetsmall;
+		g_Vars.currentplayer->crouchoffsetrealsmall = prevcrouchoffsetrealsmall;
+		g_Vars.currentplayer->crouchspeed = prevcrouchspeed;
+
+		return result;
+	}
+
+	return true;
+}
+
 void bwalkUpdateCrouchOffset(void)
 {
 	f32 targetoffset = 0;
diff --git a/src/include/game/bondwalk.h b/src/include/game/bondwalk.h
index 1dd7ff609..40c1d4e87 100644
--- a/src/include/game/bondwalk.h
+++ b/src/include/game/bondwalk.h
@@ -10,6 +10,7 @@ void bwalkSetSwayTargetf(f32 value);
 void bwalkAdjustCrouchPos(s32 value);
 void bwalk0f0c3b38(struct coord *param_1, struct defaultobj *obj);
 s32 bwalkTryMoveUpwards(f32 amount);
+bool bwalkCanMoveUpwards(f32 amount);
 bool bwalkCalculateNewPosition(struct coord *vel, f32 rotateamount, bool apply, f32 extrawidth, s32 arg4);
 bool bwalkCalculateNewPositionWithPush(struct coord *delta, f32 rotateamount, bool apply, f32 extrawidth, s32 types);
 s32 bwalk0f0c4764(struct coord *delta, struct coord *arg1, struct coord *arg2, s32 types);
@@ -21,6 +22,7 @@ void bwalkUpdateSpeedSideways(f32 targetspeed, f32 accelspeed, s32 mult);
 void bwalkUpdateSpeedForwards(f32 targetspeed, f32 accelspeed);
 void bwalkUpdateVertical(void);
 void bwalkApplyCrouchSpeed(void);
+bool bwalkCanUncrouch(void);
 void bwalkUpdateCrouchOffsetReal(void);
 void bwalkUpdateCrouchOffset(void);
 void bwalkUpdateTheta(void);