135 lines
1.9 KiB
ArmAsm
135 lines
1.9 KiB
ArmAsm
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;==================
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; check for items
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;==================
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; A holds tile value to check
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check_item:
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cmp #27
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bcc done_check_item ; not an item
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cmp #32
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bcs done_check_item ; not an item
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sec
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sbc #27 ; subtract off to get index
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; 0 = laser gun
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; 1 = lollipop 100 pts
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; 2 = book 1000 pts
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; 3 = pizza 500 pts
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; 4 = carbonated beverage 200 pts
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; ? = bear 5000 pts
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beq get_laser_gun
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; otherwise look up points and add it
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tay
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lda score_lookup,Y
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jsr inc_score
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jmp done_item_pickup
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get_laser_gun:
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lda RAYGUNS
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clc
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sed
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adc #$05
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sta RAYGUNS
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cld
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jmp done_item_pickup
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; keycards go here too...
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get_keycard:
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done_item_pickup:
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; erase
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; FIXME: only erases small tilemap
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; also need to update big
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lda #1 ; plain tile
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sta tilemap,X
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; big tilemap:
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; tilemap
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lda KEEN_Y ; divide by 4 as tile 4 blocks tall
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lsr
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lsr
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clc
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adc TILEMAP_Y ; add in tilemap Y (each row 256 bytes)
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adc #>big_tilemap ; add in offset of start
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sta btc_smc+2
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lda TILEMAP_X ; add in X offset of tilemap
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sta btc_smc+1
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lda KEEN_X
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lsr
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tay
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iny ; why add 1????
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lda #0 ; background tile
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btc_smc:
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sta $b000,Y
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; play sound
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jsr pickup_noise
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.if 0
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check_red_key:
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lda tilemap,X
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cmp #31 ; red key
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bne check_blue_key
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jsr pickup_noise
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lda INVENTORY
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ora #INV_RED_KEY
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sta INVENTORY
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; erase red key (304,96)
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lda #0
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sta $A938 ; hack
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jsr copy_tilemap_subset
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jsr update_status_bar
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jmp done_check_item
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check_blue_key:
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cmp #30 ; blue key
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bne done_check_item
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jsr pickup_noise
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lda INVENTORY
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ora #INV_BLUE_KEY
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sta INVENTORY
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; erase blue key
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lda #0
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sta $970c ; hack
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jsr copy_tilemap_subset
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jsr update_status_bar
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jmp keen_check_head
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.endif
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done_check_item:
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rts
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score_lookup:
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.byte $00,$01,$10,$05,$02,$50 ; BCD
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; 0 = laser gun
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; 1 = lollipop 100 pts
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; 2 = book 1000 pts
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; 3 = pizza 500 pts
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; 4 = carbonated beverage 200 pts
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; ? = bear 5000 pts
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