234 lines
2.9 KiB
ArmAsm
234 lines
2.9 KiB
ArmAsm
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;==========================
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; move them
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;==========================
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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_checking_lemming
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really_move_lemming:
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; bump frame
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tya
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tax
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inc lemming_frame,X ; only can inc with X
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lda lemming_status,Y
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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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;=========================
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; falling
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;=========================
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do_lemming_falling:
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inc lemming_y ; fall speed
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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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;=========================
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; walking
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;=========================
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do_lemming_walking:
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; collision detect walls
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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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clc
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adc #$20
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sta GBASH
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lda hposn_low,Y
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sta GBASL
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; increment
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; only do this every 4th frame?
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lda lemming_frame
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and #$3
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beq walking_increment
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lda lemming_x
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jmp walking_done
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walking_increment:
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; actually incrememt
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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 #$7f
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beq walking_no_wall
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walking_yes_wall:
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; reverse direction
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lda lemming_direction
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eor #$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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clc
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adc #$20
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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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; clc
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; adc #$20 ; erase bg
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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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; see if beat level
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lda lemming_y
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cmp #116
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bcc not_done_level
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cmp #127
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bcs not_done_level
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lda lemming_x
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cmp #31
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bcc not_done_level
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; done level
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jsr remove_lemming
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lda #LEVEL_WIN
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sta LEVEL_OVER
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not_done_level:
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done_checking_lemming:
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rts
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;==========================
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; remove lemming from game
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remove_lemming:
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lda #0
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sta lemming_out
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dec LEMMINGS_OUT
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jsr update_lemmings_out
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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_frame:
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.byte 0
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lemming_status:
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.byte LEMMING_FALLING
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lemming_exploding:
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.byte $00
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;=============================
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; collision check ground
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;=============================
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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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clc
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adc #$20 ; check bg, not fg
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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 #0
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; sta lemming_frame
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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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