From d532317c011b9e5653241d50b961ee8caa710144 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Tue, 9 May 2023 22:43:33 +0100
Subject: Playground

Potential example game.
---
 game/main.asm | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 game/main.asm

(limited to 'game/main.asm')

diff --git a/game/main.asm b/game/main.asm
new file mode 100644
index 0000000..3062ead
--- /dev/null
+++ b/game/main.asm
@@ -0,0 +1,75 @@
+.org 0
+
+.equ INT_VECTOR 0xff00
+
+    call init
+
+game_loop:
+    halt
+
+    call entities_erase
+    call entities_update
+    call entities_draw
+
+    jmp game_loop
+
+init:
+    ; setup an int handler so we
+    ; can use the frame int to sync
+    ld a, >INT_VECTOR
+    ld x, <INT_VECTOR
+    ld b, <int_handler
+    ld [a : x], b
+    inc x
+    ld b, >int_handler
+    ld [a : x], b
+
+    ; enable interrupts
+    cif
+
+    halt
+
+    ; pattern for the BG
+    ld b, 15
+    ld a, 0xbf
+    ld x, 0
+    ld y, 0x40
+fill_loop:
+    ld [a : x], b
+    xor b, 5
+    inc x
+    bno
+    jmp fill_loop
+    inc a
+    dec y
+    bnz
+    jmp fill_loop
+
+    call entities_draw
+
+    ret
+
+int_handler:
+    iret
+
+.include "entities.asm"
+.include "player.asm"
+
+;
+; entity data
+;
+entities:
+    ; type
+    .db ET_PLAYER
+    ; x, y
+    .db 0, 0
+    .dw player_sprite
+    .dw player_update
+
+    ; end of list
+    .db ET_END
+
+; sprite data
+player_sprite:
+    .incpng "assets/player.png"
+
-- 
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