From 6cab1d56ad2b29a2556090f1f0ce7e2b72d5460a Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Fri, 4 Oct 2024 19:56:50 +1000
Subject: Improve physics stability

---
 physics.c | 40 ++++++++++++++++++++++++++--------------
 1 file changed, 26 insertions(+), 14 deletions(-)

(limited to 'physics.c')

diff --git a/physics.c b/physics.c
index 332d292..a9bcc59 100644
--- a/physics.c
+++ b/physics.c
@@ -148,14 +148,20 @@ void update_body(
 		if (ramp) goto do_x;
 		ittiles({
 			if (tc == 1) {
-				if (*vy > 0) {
-					*y = tr.y - (r->y + r->h);
-					*vy = 0;
-					*grounded = 0;
-				} else if (*vy < 0) {
-					*y = (tr.y + tr.h) - r->y;
-					*vy = 0;
-					*headbutted = 1;
+				int to = *y + r->y + r->h - tr.y;
+				int bo = tr.y + tr.h - (r->y + *y);
+				if (to < bo) {
+					if (*vy > 0) {
+						*y = tr.y - (r->y + r->h);
+						*vy = 0;
+						*grounded = 0;
+					}
+				} else {
+					if (*vy < 0) {
+						*y = (tr.y + tr.h) - r->y;
+						*vy = 0;
+						*headbutted = 1;
+					}
 				}
 			}
 		});
@@ -188,12 +194,18 @@ do_x:
 		}
 		ittiles({
 			if (tc == 1) {
-				if (*vx > 0) {
-					*x = tr.x - (r->x + r->w);
-					*vx = 0;
-				} else if (*vx < 0) {
-					*x = (tr.x + tr.w) - r->x;
-					*vx = 0;
+				int le = *x + r->x + r->w - tr.x;
+				int ri = tr.x + tr.w - (r->x + *x);
+				if (le < ri) {
+					if (*vx > 0) {
+						*x = tr.x - (r->x + r->w);
+						*vx = 0;
+					}
+				} else {
+					if (*vx < 0) {
+						*x = (tr.x + tr.w) - r->x;
+						*vx = 0;
+					}
 				}
 			}
 		});
-- 
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