mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-07-01 18:29:27 +00:00
215 lines
2.4 KiB
ArmAsm
215 lines
2.4 KiB
ArmAsm
; Handle laser
|
|
|
|
; should handle multiple at once?
|
|
|
|
; 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
|
|
|
|
; should handle shooting while crouching
|
|
|
|
laser0_out: .byte $0
|
|
laser0_start: .byte $0
|
|
laser0_end: .byte $0
|
|
laser0_y: .byte $0
|
|
laser0_direction: .byte $0
|
|
laser0_count: .byte $0
|
|
|
|
;=========================
|
|
; fire laser
|
|
;=========================
|
|
|
|
fire_laser:
|
|
|
|
lda laser0_out
|
|
bne done_fire_laser
|
|
|
|
; activate laser slot
|
|
|
|
inc laser0_out
|
|
|
|
; reset count
|
|
|
|
lda #0
|
|
sta laser0_count
|
|
|
|
; set y
|
|
|
|
lda PHYSICIST_Y
|
|
clc
|
|
adc #4
|
|
sta laser0_y
|
|
|
|
; set direction
|
|
|
|
lda DIRECTION
|
|
sta laser0_direction
|
|
|
|
beq laser_left
|
|
bne laser_right
|
|
|
|
; set x
|
|
|
|
laser_left:
|
|
|
|
ldx PHYSICIST_X
|
|
dex
|
|
stx laser0_end
|
|
|
|
txa
|
|
sec
|
|
sbc #10
|
|
sta laser0_start
|
|
|
|
jmp done_fire_laser
|
|
|
|
laser_right:
|
|
|
|
lda PHYSICIST_X
|
|
clc
|
|
adc #5
|
|
sta laser0_start
|
|
|
|
clc
|
|
adc #10
|
|
sta laser0_end
|
|
|
|
done_fire_laser:
|
|
rts
|
|
|
|
|
|
;====================
|
|
; draw laser
|
|
;====================
|
|
|
|
draw_laser:
|
|
|
|
lda laser0_out
|
|
beq done_draw_laser
|
|
|
|
lda #$10
|
|
sta hlin_color_smc+1
|
|
|
|
lda #$0f
|
|
sta hlin_mask_smc+1
|
|
|
|
ldy laser0_y
|
|
|
|
sec
|
|
lda laser0_end
|
|
sbc laser0_start
|
|
tax
|
|
|
|
lda laser0_start
|
|
|
|
jsr hlin
|
|
|
|
done_draw_laser:
|
|
|
|
rts
|
|
|
|
|
|
|
|
;===================
|
|
; move laser
|
|
;===================
|
|
move_laser:
|
|
lda laser0_out
|
|
beq done_move_laser
|
|
|
|
; slow down laser
|
|
lda laser0_count
|
|
and #$3
|
|
bne no_move_laser
|
|
|
|
lda laser0_direction
|
|
bne move_laser_right
|
|
|
|
move_laser_left:
|
|
|
|
lda laser0_count
|
|
cmp #4
|
|
bcc still_starting_left
|
|
cmp #8
|
|
bcc still_shooting_left
|
|
|
|
continue_shooting_left:
|
|
still_shooting_left:
|
|
|
|
lda laser0_end
|
|
sec
|
|
sbc #10
|
|
sta laser0_end
|
|
|
|
still_starting_left:
|
|
|
|
lda laser0_start
|
|
sec
|
|
sbc #10
|
|
sta laser0_start
|
|
|
|
laser_edge_detect_left:
|
|
|
|
lda laser0_end
|
|
bmi disable_laser
|
|
|
|
lda laser0_start
|
|
bpl no_move_laser
|
|
|
|
lda #0
|
|
sta laser0_start
|
|
|
|
jmp no_move_laser
|
|
|
|
|
|
move_laser_right:
|
|
|
|
lda laser0_count
|
|
cmp #4
|
|
bcc still_starting_right
|
|
cmp #8
|
|
bcc still_shooting_right
|
|
|
|
continue_shooting_right:
|
|
lda laser0_start
|
|
clc
|
|
adc #10
|
|
sta laser0_start
|
|
|
|
still_shooting_right:
|
|
lda laser0_end
|
|
clc
|
|
adc #10
|
|
sta laser0_end
|
|
|
|
still_starting_right:
|
|
|
|
laser_edge_detect_right:
|
|
|
|
; detect if totally off screen
|
|
lda laser0_start
|
|
cmp #40
|
|
bcs disable_laser
|
|
|
|
lda laser0_end
|
|
cmp #40
|
|
bcc no_move_laser
|
|
|
|
lda #39
|
|
sta laser0_end
|
|
|
|
no_move_laser:
|
|
inc laser0_count
|
|
|
|
done_move_laser:
|
|
|
|
rts
|
|
|
|
disable_laser:
|
|
lda #0
|
|
sta laser0_out
|
|
rts
|
|
|