Menu WIP

1 files changed, 166 insertions, 2 deletions

diff --git a/game/main.asm b/game/main.asm
index bfc203c..8abd239 100644
--- a/game/main.asm
+++ b/game/main.asm
@@ -3,6 +3,31 @@
 .equ INT_VECTOR 0xff00
 
     call init
+
+menu:
+    ld x, <blink
+    ld a, >blink
+    ld y, 0
+    ld [a : x], y
+
+    call clear_screen
+
+menu_loop:
+    halt
+
+    call stars_update
+    call menu_draw
+
+    ; read controller 1
+    ld b, 0xf0
+    port b, b
+
+    ; start
+    bit b, 7
+    bnz
+    jmp menu_loop
+
+play:
     call init_game
 
 game_loop:
@@ -13,8 +38,17 @@ game_loop:
     call entities_update
     call entities_draw
 
+    ; read controller 1
+    ld b, 0xf0
+    port b, b
+
+    ; select to exit
+    bit b, 6
+    bnz
     jmp game_loop
 
+    jmp menu
+
 init:
     ; setup an int handler so we
     ; can use the frame int to sync
@@ -45,6 +79,12 @@ init_game:
     ld y, 104
     ld [a : x], y
 
+    call clear_screen
+    call entities_draw
+
+    ret
+
+clear_screen:
     ; erase the screen
     ld b, 0
     ld a, 0xbf
@@ -59,9 +99,127 @@ fill_loop:
     dec y
     bnz
     jmp fill_loop
+    ret
 
-    call entities_draw
+blink:
+    .db 0
+
+menu_draw:
+    ; settings mode
+    ld y, 128
+    ld b, 0xb0
+    port b, y
+
+    ; setup
+    inc b
 
+    ; addr: title sprite
+    ld y, <title
+    port b, y
+    ld y, >title
+    port b, y
+
+    ; x
+    ld y, 26
+    port b, y
+
+    ; y
+    ld y, 40
+    port b, y
+
+    ld y, 76
+    port b, y
+    ld y, 21
+    port b, y
+
+    ; blit
+    dec b
+    ; write, transparent
+    ld y, 3
+    port b, y
+
+    ; settings mode
+    ld y, 128
+    port b, y
+
+    ; setup
+    inc b
+
+    ld x, <blink
+    ld a, >blink
+    ld y, [a : x]
+    inc y
+    and y, 31
+    ld [a : x], y
+    cmp y, 10
+    bnc
+    jmp menu_draw_start
+
+    ; addr: black to erase sprite
+    ld y, 0
+    port b, y
+    ld y, 0xa0
+    port b, y
+    jmp menu_continue_start
+
+menu_draw_start:
+    ; addr: press start sprite
+    ld y, <press
+    port b, y
+    ld y, >press
+    port b, y
+
+menu_continue_start:
+    ; x
+    ld y, 36
+    port b, y
+
+    ; y
+    ld y, 80
+    port b, y
+
+    ld y, 56
+    port b, y
+    ld y, 8
+    port b, y
+
+    ; blit
+    dec b
+    ; write, transparent
+    ld y, 3
+    port b, y
+
+    ; settings mode
+    ld y, 128
+    port b, y
+
+    ; setup
+    inc b
+
+    ; addr: usebox logo sprite
+    ld y, <usebox
+    port b, y
+    ld y, >usebox
+    port b, y
+
+    ; x
+    ld y, 44
+    port b, y
+
+    ; y
+    ld y, 118
+    port b, y
+
+    ld y, 40
+    port b, y
+    ld y, 8
+    port b, y
+
+    ; blit
+    dec b
+    ; write, transparent
+    ld y, 3
+    port b, y
     ret
 
 int_handler:
@@ -139,4 +297,10 @@ stars:
     ; end of list
     .dw 0xffff
 
-
+; menu data
+title:
+    .incpng "assets/title.png"
+press:
+    .incpng "assets/press.png"
+usebox:
+    .incpng "assets/usebox.png"