From: Lukas Krickl <lukas@krickl.dev>
Date: Tue, 3 Feb 2026 05:01:29 +0000 (+0100)
Subject: math: wip 16 bit math
X-Git-Url: https://git.krickl.dev/?a=commitdiff_plain;h=5fb648b4350c148a5586615d7cbc9aa3ac2eb96d;p=gbrg%2F.git

math: wip 16 bit math

Reduced tick rate
---

diff --git a/src/actor.s b/src/actor.s
index ab27f0f..8a31e56 100644
--- a/src/actor.s
+++ b/src/actor.s
@@ -104,7 +104,7 @@ act_draw_all:
 act_r_bat:
 	push de
 	call rand ; pick a random direction
-	and a, 3
+	and a, 7 ; 0-3 direction 4-7 noop
 	pop de
 	ld hl, act_pos_y
 	add hl, de
diff --git a/src/defs.s b/src/defs.s
index 7584686..77b46a8 100644
--- a/src/defs.s
+++ b/src/defs.s
@@ -7,7 +7,7 @@
 
 	; how often should turns auto-end
 	; frame timer
-#define TICK_RATE 10
+#define TICK_RATE 30
 
 .def int OAMDMAFN = 0xFF80 
 #define WRAM 0xC000
diff --git a/src/math.s b/src/math.s
index caec838..524586c 100644
--- a/src/math.s
+++ b/src/math.s
@@ -76,7 +76,9 @@ m16_add:
 	ret nc ; no carry? good to exit
 
 	; when carry is set -> set flag
-	ld a, M16_CARRY
+	ld b, M16_CARRY
+	ld a, [m16_flags]
+	or a, b
 	ld [m16_flags], a
 
 	ret
@@ -109,7 +111,9 @@ m16_sub:
 	ret nc
 
 	; when carry is set -> set flag
-	ld a, M16_CARRY
+	ld b, M16_CARRY
+	ld a, [m16_flags]
+	or a, b
 	ld [m16_flags], a
 
 	ret