diff options
Diffstat (limited to 'src/items.s')
| -rw-r--r-- | src/items.s | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/src/items.s b/src/items.s index e90ae82..447b874 100644 --- a/src/items.s +++ b/src/items.s @@ -17,6 +17,13 @@ zp_player_screen_x = $45 ; asan:ignore PLAYER_WAIST = $0C + ;; The tile coordinates are also cached during the update() + ;; function. Reserve them into their own memory regions to avoid surprises + ;; by using the 'Globals::zp_arg0' and 'Globals::zp_arg1' variables which + ;; are also being used by the background check. + zp_player_tile_y = $43 + zp_player_tile_x = $48 + ;; Maximum amount of items allowed on screen at the same time. POOL_CAPACITY = 3 @@ -341,14 +348,14 @@ lsr lsr lsr - sta Globals::zp_arg0 + sta Items::zp_player_tile_y lda zp_player_screen_x lsr lsr lsr clc adc #1 - sta Globals::zp_arg1 + sta Items::zp_player_tile_x @loop: ;; This index will be valid throughout the iteration so different @@ -735,22 +742,22 @@ ;; Check for the Y tile coordinate. If it's not the same on either the ;; upper or the bottom parts of the item, then it's a no. - cmp Globals::zp_arg0 + cmp Items::zp_player_tile_y beq @check_x clc adc #1 - cmp Globals::zp_arg0 + cmp Items::zp_player_tile_y bne @no @check_x: ;; If the Y tile coordinate checks out, let's narrow it down to the X ;; coordinate. lda Items::zp_current_tiles + 1, x - cmp Globals::zp_arg1 + cmp Items::zp_player_tile_x beq @yes clc adc #1 - cmp Globals::zp_arg1 + cmp Items::zp_player_tile_x bne @no @yes: |