mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-06 16:29:33 +00:00
393 lines
5.5 KiB
ArmAsm
393 lines
5.5 KiB
ArmAsm
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; TODO: auto-size this based on MAX_LEMMINGS
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lemming_x:
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.byte 0,0,0,0,0,0,0,0,0,0
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lemming_y:
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.byte 0,0,0,0,0,0,0,0,0,0
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lemming_direction:
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.byte 0,0,0,0,0,0,0,0,0,0
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lemming_out:
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.byte 0,0,0,0,0,0,0,0,0,0
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lemming_frame:
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.byte 0,0,0,0,0,0,0,0,0,0
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lemming_status:
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.byte 0,0,0,0,0,0,0,0,0,0
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lemming_exploding:
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.byte 0,0,0,0,0,0,0,0,0,0
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lemming_fall_distance:
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.byte 0,0,0,0,0,0,0,0,0,0
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lemming_attribute:
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.byte 0,0,0,0,0,0,0,0,0,0
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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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sty CURRENT_LEMMING
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move_lemming_loop:
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ldy CURRENT_LEMMING
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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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tya
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tax
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inc lemming_y,X ; fall speed
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inc lemming_y,X
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inc lemming_fall_distance,X ; how far
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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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; see if ground has risen up
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jsr collision_check_hill
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; collision detect walls
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ldy CURRENT_LEMMING
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lda lemming_y,Y
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clc
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adc #3 ; waist-high?
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tax
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lda hposn_high,X
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clc
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adc #$20
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sta GBASH
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lda hposn_low,X
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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,Y
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and #$3
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beq walking_increment
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bne walking_done
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walking_increment:
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; actually incrememt
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clc ; increment/decrement X
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lda lemming_x,Y
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adc lemming_direction,Y ; A is now incremented version
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; sta lemming_x,Y
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tay ; Y is now incremented version
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lda (GBASL),Y ; collision check
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and #$7f
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beq walking_no_wall
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walking_yes_wall:
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; we hit a wall, reverse course, undo the increment
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; Y is updated
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jsr check_at_exit_xiny
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; reverse direction
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ldy CURRENT_LEMMING
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lda lemming_direction,Y
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eor #$ff
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clc
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adc #1
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sta lemming_direction,Y
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jmp walking_no_increment
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walking_no_wall:
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; y is incremented version
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tya
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ldy CURRENT_LEMMING
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sta lemming_x,Y
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walking_no_increment:
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jsr collision_check_ground
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walking_done:
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jmp done_move_lemming
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;=====================
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; digging
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;=====================
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do_lemming_digging:
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lda lemming_y,Y
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clc
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adc #9
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tax
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lda hposn_high,X
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clc
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adc #$20
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sta GBASH
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lda hposn_low,X
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sta GBASL
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lda lemming_x,Y
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tay
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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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ldx CURRENT_LEMMING
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inc lemming_y,X
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jmp done_digging
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digging_falling:
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ldy CURRENT_LEMMING
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lda #LEMMING_FALLING
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sta lemming_status,Y
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done_digging:
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done_move_lemming:
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done_checking_lemming:
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inc CURRENT_LEMMING
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lda CURRENT_LEMMING
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cmp #MAX_LEMMINGS
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beq really_done_checking_lemming
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jmp move_lemming_loop
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really_done_checking_lemming:
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rts
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;==========================
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; remove lemming from game
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;==========================
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; Y points to CURRENT_LEMMING
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; if C set it means they exited
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remove_lemming:
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bcc didnt_exit
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sed
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lda PERCENT_RESCUED_L
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clc
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adc PERCENT_ADD
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sta PERCENT_RESCUED_L
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bcc no_percent_oflo
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inc PERCENT_RESCUED_H
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no_percent_oflo:
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cld
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jsr update_percent_in
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didnt_exit:
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sed ; decrement BCD value
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lda LEMMINGS_OUT
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sec
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sbc #1
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sta LEMMINGS_OUT
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cld
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jsr click_speaker
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lda #0
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ldy CURRENT_LEMMING
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sta lemming_out,Y
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jsr update_lemmings_out
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; if that was the last one, then level over
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lda LEMMINGS_OUT
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bne not_last_lemming
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lda #LEVEL_WIN
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sta LEVEL_OVER
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not_last_lemming:
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rts
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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,Y
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clc
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adc #9
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tax
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lda hposn_high,X
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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,X
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sta GBASL
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lda lemming_x,Y
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tay
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lda (GBASL),Y
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and #$7f
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beq ground_falling ; if empty space below us, fall
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ground_walking:
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; hit ground walking
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ldy CURRENT_LEMMING
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lda lemming_fall_distance,Y
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cmp #32
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bcs lemming_goes_splat
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lda #0
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sta lemming_fall_distance,Y
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lda #LEMMING_WALKING ; else, walk
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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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ldy CURRENT_LEMMING
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sta lemming_status,Y
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rts
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lemming_goes_splat:
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lda #LEMMING_SPLATTING
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sta lemming_status,Y
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lda #0
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sta lemming_frame,Y
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; clc
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; jsr remove_lemming
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rts
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;=============================
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; collision check hill
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;=============================
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collision_check_hill:
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lda lemming_y,Y
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clc
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adc #8
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tax
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lda hposn_high,X
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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,X
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sta GBASL
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lda lemming_x,Y
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tay
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lda (GBASL),Y
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and #$7f
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beq on_ground ; if empty space below us, good
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underground:
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ldx CURRENT_LEMMING
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dec lemming_y,X ; bump us up
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on_ground:
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rts
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;=============================
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; check at exit
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;=============================
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check_at_exit_xiny:
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tya
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ldy CURRENT_LEMMING
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jmp check_at_exit_y
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check_at_exit:
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; see if at exit
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ldy CURRENT_LEMMING
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; check X
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lda lemming_x,Y
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check_at_exit_y:
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exit_x1_smc:
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cmp #31
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bcc not_done_level
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exit_x2_smc:
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cmp #35
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bcs not_done_level
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; check Y
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lda lemming_y,Y
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exit_y1_smc:
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cmp #116
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bcc not_done_level
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exit_y2_smc:
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cmp #127
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bcs not_done_level
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; done level
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sec
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jsr remove_lemming
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not_done_level:
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rts
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