mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-09-29 08:55:10 +00:00
152 lines
1.8 KiB
ArmAsm
152 lines
1.8 KiB
ArmAsm
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move_lemmings:
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ldy #0
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lda lemming_out,Y
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bne really_move_lemming
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jmp done_move_lemming
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really_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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lda lemming_y
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clc
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adc #3 ; waist-high?
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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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clc
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lda lemming_x
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adc lemming_direction
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tay
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lda (GBASL),Y
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and #$7f
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beq walking_no_wall
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walking_yes_wall:
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lda lemming_direction
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eor #$ff
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clc
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adc #1
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sta lemming_direction
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lda lemming_x
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walking_no_wall:
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tya
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walking_done:
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sta lemming_x
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jsr collision_check_ground
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jmp done_move_lemming
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do_lemming_digging:
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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 digging_falling
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digging_digging:
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lda #$0
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sta (GBASL),Y
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lda GBASH
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adc #$20
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sta GBASH
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lda #$0
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sta (GBASL),Y
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inc lemming_y
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jmp done_digging
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digging_falling:
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lda #LEMMING_FALLING
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sta lemming_status
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done_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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