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ootw: laser: start making movement code generic

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This commit is contained in:
Vince Weaver 2019-08-22 12:28:01 -04:00
parent 33738a7cc9
commit 57ff1da4e6
1 changed files with 34 additions and 28 deletions
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62
ootw/laser.s
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@ -35,7 +35,7 @@ laser_direction:
laser0_direction: .byte $0
laser1_direction: .byte $0
laser_cout:
laser_count:
laser0_count: .byte $0
laser1_count: .byte $0
@ -169,20 +169,23 @@ done_draw_laser:
; move laser
;===================
move_laser:
lda laser0_out
ldx #0
move_laser_loop:
lda laser_out,X
beq done_move_laser
; slow down laser
lda laser0_count
lda laser_count,X
and #$3
bne no_move_laser
lda laser0_direction
lda laser_direction,X
bne move_laser_right
move_laser_left:
lda laser0_count
lda laser_count,X
cmp #4
bcc still_starting_left
cmp #8
@ -191,72 +194,72 @@ move_laser_left:
continue_shooting_left:
still_shooting_left:
lda laser0_end
lda laser_end,X
sec
sbc #10
sta laser0_end
sta laser_end,X
still_starting_left:
lda laser0_start
lda laser_start,X
sec
sbc #10
sta laser0_start
sta laser_start,X
laser_edge_detect_left:
lda laser0_end
lda laser_end,X
cmp LEFT_SHOOT_LIMIT
bmi disable_laser_left
lda laser0_start
lda laser_start,X
cmp LEFT_SHOOT_LIMIT
bpl no_move_laser
lda LEFT_SHOOT_LIMIT
sta laser0_start
sta laser_start,X
jmp no_move_laser
move_laser_right:
lda laser0_count
lda laser_count,X
cmp #4
bcc still_starting_right
cmp #8
bcc still_shooting_right
continue_shooting_right:
lda laser0_start
lda laser_start,X
clc
adc #10
sta laser0_start
sta laser_start,X
still_shooting_right:
lda laser0_end
lda laser_end,X
clc
adc #10
sta laser0_end
sta laser_end,X
still_starting_right:
laser_edge_detect_right:
; detect if totally off screen
lda laser0_start
lda laser_start,X
cmp RIGHT_SHOOT_LIMIT
bcs disable_laser_right
lda laser0_end
lda laser_end,X
cmp RIGHT_SHOOT_LIMIT
bcc no_move_laser
lda RIGHT_SHOOT_LIMIT
sta laser0_end
sta laser_end,X
no_move_laser:
inc laser0_count
inc laser_count,X
done_move_laser:
@ -281,12 +284,15 @@ disable_laser_right:
; hit something, common
;======================
hit_something_common:
pha
; disable laser
ldx #0
stx laser0_out
lda #0
sta laser_out,X
tax
pla
tay
and #$f0
cmp #TARGET_ALIEN
@ -301,15 +307,15 @@ hit_something_common:
laser_hit_alien:
txa
tya
and #$f
tax
tay
lda #A_DISINTEGRATING
sta alien_state,X
sta alien_state,Y
lda #0
sta alien_gait,X
sta alien_gait,Y
jmp done_hit_something