From: Lukas Krickl <lukas@krickl.dev>
Date: Tue, 23 Sep 2025 20:47:34 +0000 (+0200)
Subject: player: Added sub-pixel movement
X-Git-Url: https://git.krickl.dev/?a=commitdiff_plain;h=75a060d8cca1ed45c86428ee51f41b8a36eeef7a;p=gbrg%2F.git

player: Added sub-pixel movement
---

diff --git a/src/player.s b/src/player.s
index e4e5599..1794ae3 100644
--- a/src/player.s
+++ b/src/player.s
@@ -1,4 +1,4 @@
-#define PLAYER_SPEED 1
+#define PLAYER_SPEED 0x80 
 
 	; sets up the player actor
 player_init:
@@ -104,12 +104,18 @@ player_try_scroll_up:
 	;	returns:
 	;		b/c: new y/x position
 player_stage_move_p:
-	ld a, [player+act_pos_y]
+	ld a, [player_sub_pixel_y]
 	add a, b
+	ld [player_sub_pixel_y], a
+	ld a, [player+act_pos_y]
+	adc a, 0 
 	ld b, a
 
-	ld a, [player+act_pos_x]
+	ld a, [player_sub_pixel_x]
 	add a, c
+	ld [player_sub_pixel_x], a
+	ld a, [player+act_pos_x]
+	adc a, 0 
 	ld c, a
 	
 	ret
@@ -120,12 +126,18 @@ player_stage_move_p:
 	;	returns:
 	;		b/c: new y/x position
 player_stage_move_n:
-	ld a, [player+act_pos_y]
+	ld a, [player_sub_pixel_y]
 	sub a, b
+	ld [player_sub_pixel_y], a
+	ld a, [player+act_pos_y]
+	sbc a, 0 
 	ld b, a
 
-	ld a, [player+act_pos_x]
+	ld a, [player_sub_pixel_x]
 	sub a, c
+	ld [player_sub_pixel_x], a
+	ld a, [player+act_pos_x]
+	sbc a, 0 
 	ld c, a
 	
 	ret
diff --git a/src/wram.s b/src/wram.s
index e16109c..e52a323 100644
--- a/src/wram.s
+++ b/src/wram.s
@@ -63,7 +63,9 @@ srand: .adv 2
 	; advance if possible
 player_next_scroll_y: .adv 1
 
-
+; y/x sub pixel movement for player
+player_sub_pixel_y: .adv 1
+player_sub_pixel_x: .adv 1
 player: .adv act_size
 actors: .adv act_size * ACTS_MAX 
 map_objs: .adv mo_size * MAP_OBJ_MAX