mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-25 09:29:35 +00:00
83 lines
1.0 KiB
ArmAsm
83 lines
1.0 KiB
ArmAsm
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move_lemmings:
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lda lemming_out
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beq done_move_lemming
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lda lemming_status
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cmp #LEMMING_FALLING
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beq do_lemming_falling
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cmp #LEMMING_WALKING
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beq do_lemming_walking
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cmp #LEMMING_DIGGING
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beq do_lemming_digging
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jmp done_move_lemming
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do_lemming_falling:
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inc lemming_y
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jsr collision_check_ground
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jmp done_move_lemming
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do_lemming_walking:
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clc
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lda lemming_x
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adc lemming_direction
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sta lemming_x
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jsr collision_check_ground
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do_lemming_digging:
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done_move_lemming:
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rts
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lemming_direction:
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.byte 1
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lemming_x:
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.byte 12
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lemming_y:
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.byte 45
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lemming_out:
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.byte $0
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LEMMING_FALLING = 1
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LEMMING_WALKING = 2
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LEMMING_DIGGING = 3
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lemming_status:
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.byte LEMMING_FALLING
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lemming_job:
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.byte $00
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collision_check_ground:
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lda lemming_y
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clc
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adc #9
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tay
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lda hposn_high,Y
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sta GBASH
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lda hposn_low,Y
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sta GBASL
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ldy lemming_x
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lda (GBASL),Y
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and #$7f
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beq ground_falling
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ground_walking:
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lda #LEMMING_WALKING
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jmp done_check_ground
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ground_falling:
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lda #LEMMING_FALLING
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done_check_ground:
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sta lemming_status
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rts
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