From fe0e86d475b825d855e58662bef3bcedab5eab60 Mon Sep 17 00:00:00 2001
From: "Juan J. Martinez" <jjm@usebox.net>
Date: Thu, 25 May 2023 07:53:05 +0100
Subject: Add score to the HUD

- add points to the score
- hiscore updates
---
 game/main.asm | 149 ++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 140 insertions(+), 9 deletions(-)

diff --git a/game/main.asm b/game/main.asm
index 87e2f97..253c812 100644
--- a/game/main.asm
+++ b/game/main.asm
@@ -49,6 +49,46 @@ game_loop:
     bnz
     jmp game_loop
 
+    ; see if the hiscore needs updating
+
+    ; 6 digits to compare
+    ld y, 6
+    push y
+
+    ld x, <score
+    ld a, >score
+    ld y, <hiscore
+    ld b, >hiscore
+update_hiscore_loop:
+    cmpi
+    bc
+    jmp update_no_hiscore
+    bnz
+    jmp update_new_hiscore
+
+    push y
+    ld y, [sp + 1]
+    dec y
+    ld [sp + 1], y
+    pop y
+    bno
+    jmp update_hiscore_loop
+
+update_new_hiscore:
+    ; new hiscore!
+    ld x, <score
+    ld a, >score
+    ld y, <hiscore
+    ld b, >hiscore
+    ldi
+    ldi
+    ldi
+    ldi
+    ldi
+    ldi
+
+update_no_hiscore:
+    pop y
     jmp menu
 
 ;
@@ -70,15 +110,18 @@ init_game:
     ld [a : x], y
 
     ; clear score
-    ld x, <score
-    ld a, >score
-    ld y, 6
-    ld b, 0
-init_score_loop:
-    ld [a : x], b
-    dec y
-    bnz
-    jmp init_score_loop
+    ld y, <score
+    ld b, >score
+    ; this is all zeroes that we use
+    ; to erase things on screen etc
+    ld x, 0
+    ld a, 0xa0
+    ldi
+    ldi
+    ldi
+    ldi
+    ldi
+    ldi
 
     halt
 
@@ -87,7 +130,53 @@ init_score_loop:
 
     ret
 
+;
+; Update the HUD (score, lives, etc)
+;
 update_hud:
+    ; erase
+
+    ; settings mode
+    ld y, 128
+    ld b, 0xb0
+    port b, y
+
+    ; setup
+    inc b
+
+    ; addr: bg data
+    ld y, 0
+    port b, y
+    ld y, 0xa0
+    port b, y
+
+    ; x
+    inc x
+    bo
+    inc a
+    ld y, 100
+    port b, y
+
+    ; y
+    inc x
+    bo
+    inc a
+    ld y, 4
+    port b, y
+
+    ; w
+    ld y, 25
+    port b, y
+    ; h
+    ld y, 8
+    port b, y
+
+    ; blit
+    dec b
+    ; write, no transparent
+    ld y, 1
+    port b, y
+
     ; 6 digits
     ld x, 6
     push x
@@ -104,6 +193,48 @@ update_hud:
     pop x
     ret
 
+;
+; Add points to the score
+;
+; in: y points (1 to 10)
+add_score:
+    ; update score
+    ld x, <score
+    ld a, >score
+    add x, 5
+    bo
+    inc a
+
+    ld b, 6
+add_score_loop:
+    push b
+
+    ld b, [a : x]
+    add b, y
+    ld [a : x], b
+    cmp b, 10
+    bnc
+    jmp add_score_carry
+
+    pop b
+    ret
+
+add_score_carry:
+    sub b, 10
+    ld [a : x], b
+
+    ld y, 1
+
+    dec x
+    bo
+    dec a
+
+    pop b
+    dec b
+    bnz
+    jmp add_score_loop
+    ret
+
 ;
 ; Helper to clear the screen
 ;
-- 
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