From 681ba9adf948ebdc909b08979c76251053af7a9e Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Thu, 11 May 2023 20:57:55 +0100
Subject: Add starfield effect

---
 game/main.asm | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 51 insertions(+), 3 deletions(-)

(limited to 'game/main.asm')

diff --git a/game/main.asm b/game/main.asm
index 68d1267..e779a95 100644
--- a/game/main.asm
+++ b/game/main.asm
@@ -8,6 +8,7 @@ game_loop:
     halt
 
     call entities_erase
+    call stars_update
     call entities_update
     call entities_draw
 
@@ -29,14 +30,13 @@ init:
 
     halt
 
-    ; pattern for the BG
-    ld b, 15
+    ; erase the screen
+    ld b, 0
     ld a, 0xbf
     ld x, 0
     ld y, 0x40
 fill_loop:
     ld [a : x], b
-    xor b, 5
     inc x
     bno
     jmp fill_loop
@@ -52,6 +52,7 @@ fill_loop:
 int_handler:
     iret
 
+.include "starfield.asm"
 .include "entities.asm"
 .include "player.asm"
 
@@ -75,3 +76,50 @@ entities:
 player_sprite:
     .incpng "assets/player.png"
 
+; starfield data
+stars:
+    ; video addr, speed, color
+    .dw 0xc361
+    .db 1, 15
+    .dw 0xc204
+    .db 1, 6
+    .dw 0xcdf9
+    .db 1, 15
+    .dw 0xdb87
+    .db 1, 3
+    .dw 0xd242
+    .db 1, 15
+    .dw 0xdeea
+    .db 1, 6
+    .dw 0xe7af
+    .db 1, 15
+    .dw 0xed68
+    .db 1, 3
+    .dw 0xf812
+    .db 1, 15
+    .dw 0xfbca
+    .db 1, 13
+    .dw 0xc361
+    .db 2, 8
+    .dw 0xc204
+    .db 2, 9
+    .dw 0xcdf9
+    .db 3, 7
+    .dw 0xdb87
+    .db 3, 4
+    .dw 0xd242
+    .db 2, 8
+    .dw 0xdeea
+    .db 3, 9
+    .dw 0xe7af
+    .db 3, 6
+    .dw 0xed68
+    .db 2, 9
+    .dw 0xf812
+    .db 3, 14
+    .dw 0xfbca
+    .db 2, 3
+    ; end of list
+    .dw 0xffff
+
+
-- 
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