dos33fsprogs/ootw/laser.s

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ArmAsm
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2019-08-15 20:27:02 +00:00
; FIXME: merge a lot of the target code
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; Handle laser
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; should handle multiple at once?
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; when pressed, find empty slot?
; initially 10 wide, from gun to right or left
; expand to 20 wide
; stop when encounter door, enemy, or edge of screen
; should bounds check carefully
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; should handle shooting while crouching
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MAX_LASERS = 2
laser_out:
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laser0_out: .byte $0
laser1_out: .byte $0
laser_start:
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laser0_start: .byte $0
laser1_start: .byte $0
laser_end:
laser0_end: .byte $0
laser1_end: .byte $0
laser_y:
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laser0_y: .byte $0
laser1_y: .byte $0
laser_direction:
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laser0_direction: .byte $0
laser1_direction: .byte $0
laser_count:
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laser0_count: .byte $0
laser1_count: .byte $0
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;=========================
; fire laser
;=========================
fire_laser:
lda PHYSICIST_X
; FIXME: if facing right, add 5 to this value
; to allow shooting through shield
sta COLLISION_X
lda PHYSICIST_Y
sta COLLISION_Y
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lda laser0_out
bne done_fire_laser
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; activate laser slot
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inc laser0_out
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; reset count
lda #0
sta laser0_count
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; set y
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lda PHYSICIST_Y
clc
adc #4
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ldx PHYSICIST_STATE
cpx #P_CROUCH_SHOOTING
bne laser_crouch_done
laser_crouch:
clc
adc #4
laser_crouch_done:
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sta laser0_y
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; set direction
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lda DIRECTION
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sta laser0_direction
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beq laser_left
bne laser_right
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; set x
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laser_left:
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jsr calc_gun_left_collision
ldx PHYSICIST_X
dex
stx laser0_end
txa
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sec
sbc #10
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sta laser0_start
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jmp done_fire_laser
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laser_right:
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jsr calc_gun_right_collision
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lda PHYSICIST_X
clc
adc #5
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sta laser0_start
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clc
adc #10
sta laser0_end
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done_fire_laser:
rts
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;====================
; draw laser
;====================
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draw_laser:
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ldx #0
draw_laser_loop:
lda laser_out,X
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beq done_draw_laser
txa
pha ; save X on stack
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lda #$10
sta hlin_color_smc+1
lda #$0f
sta hlin_mask_smc+1
ldy laser_y,X
sec
lda laser_end,X
sbc laser_start,X
sta LASER_TEMP
lda laser_start,X
ldx LASER_TEMP
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jsr hlin
pla ; restore X from stack
tax
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done_draw_laser:
inx
cpx #MAX_LASERS
bne draw_laser_loop
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rts
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;===================
; move laser
;===================
move_laser:
ldx #0
move_laser_loop:
lda laser_out,X
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beq done_move_laser
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; slow down laser
lda laser_count,X
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and #$3
bne no_move_laser
lda laser_direction,X
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bne move_laser_right
move_laser_left:
lda laser_count,X
cmp #4
bcc still_starting_left
cmp #8
bcc still_shooting_left
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continue_shooting_left:
still_shooting_left:
lda laser_end,X
sec
sbc #10
sta laser_end,X
still_starting_left:
lda laser_start,X
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sec
sbc #10
sta laser_start,X
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laser_edge_detect_left:
lda laser_end,X
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cmp LEFT_SHOOT_LIMIT
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bmi disable_laser_left
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lda laser_start,X
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cmp LEFT_SHOOT_LIMIT
bpl no_move_laser
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lda LEFT_SHOOT_LIMIT
sta laser_start,X
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jmp no_move_laser
move_laser_right:
lda laser_count,X
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cmp #4
bcc still_starting_right
cmp #8
bcc still_shooting_right
continue_shooting_right:
lda laser_start,X
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clc
adc #10
sta laser_start,X
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still_shooting_right:
lda laser_end,X
clc
adc #10
sta laser_end,X
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still_starting_right:
laser_edge_detect_right:
; detect if totally off screen
lda laser_start,X
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cmp RIGHT_SHOOT_LIMIT
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bcs disable_laser_right
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lda laser_end,X
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cmp RIGHT_SHOOT_LIMIT
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bcc no_move_laser
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lda RIGHT_SHOOT_LIMIT
sta laser_end,X
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no_move_laser:
inc laser_count,X
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done_move_laser:
inx
cpx #MAX_LASERS
bne move_laser_loop
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rts
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;===================
; hit something, left
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;===================
disable_laser_left:
lda LEFT_SHOOT_TARGET
jmp hit_something_common
;====================
; hit something, right
;====================
disable_laser_right:
lda RIGHT_SHOOT_TARGET
;======================
; hit something, common
;======================
hit_something_common:
pha
; disable laser
lda #0
sta laser_out,X
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pla
tay
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and #$f0
cmp #TARGET_ALIEN
beq laser_hit_alien
cmp #TARGET_FRIEND
beq laser_hit_friend
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cmp #TARGET_PHYSICIST
beq laser_hit_physicist
; FIXME: reduce shields if hit them?
jmp done_hit_something
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laser_hit_alien:
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tya
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and #$f
tay
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lda #A_DISINTEGRATING
sta alien_state,Y
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lda #0
sta alien_gait,Y
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jmp done_hit_something
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laser_hit_friend:
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lda #F_DISINTEGRATING
sta friend_state
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lda #FAI_DISINTEGRATING
sta friend_ai_state
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lda #0
sta friend_gait
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jmp done_hit_something
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laser_hit_physicist:
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lda #P_DISINTEGRATING
sta PHYSICIST_STATE
lda #0
sta GAIT
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done_hit_something:
jmp done_move_laser
; rts
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