mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-16 23:20:43 +00:00
101 lines
1.3 KiB
ArmAsm
101 lines
1.3 KiB
ArmAsm
; draw/move laser
|
|
|
|
; o/~ carrying a laser, down the road that I must travel o/~
|
|
; o/~ carrying a laser, in the darkness of the night o/~
|
|
|
|
;====================
|
|
; move laser
|
|
;====================
|
|
move_laser:
|
|
lda LASER_OUT
|
|
beq done_move_laser
|
|
|
|
lda LASER_X
|
|
clc
|
|
adc LASER_DIRECTION
|
|
sta LASER_X
|
|
|
|
laser_check_tiles:
|
|
; collision detect with tiles
|
|
|
|
; laser location is roughly
|
|
; (y/4)*16 + (x/2) - 2
|
|
lda LASER_Y
|
|
lsr
|
|
lsr
|
|
asl
|
|
asl
|
|
asl
|
|
asl
|
|
sta LASER_TILE
|
|
lda LASER_X
|
|
lsr
|
|
clc
|
|
adc LASER_TILE
|
|
sec
|
|
sbc #2
|
|
sta LASER_TILE
|
|
|
|
ldx LASER_TILE
|
|
lda TILEMAP,X
|
|
cmp #HARD_TILES
|
|
bcs destroy_laser
|
|
|
|
|
|
laser_check_enemies:
|
|
; collision detect with enemies
|
|
|
|
jsr laser_enemies
|
|
|
|
|
|
; detect if off screen
|
|
laser_check_right:
|
|
lda LASER_X
|
|
cmp #31
|
|
bcc laser_check_left ; not_too_far_right
|
|
bcs destroy_laser
|
|
|
|
laser_check_left:
|
|
cmp #6
|
|
bcs done_move_laser
|
|
bcc destroy_laser
|
|
|
|
destroy_laser:
|
|
lda #0
|
|
sta LASER_OUT
|
|
|
|
done_move_laser:
|
|
rts
|
|
|
|
;====================
|
|
; draw laser
|
|
;====================
|
|
|
|
draw_laser:
|
|
|
|
lda LASER_OUT
|
|
beq done_draw_laser
|
|
|
|
lda LASER_X
|
|
sta XPOS
|
|
lda LASER_Y
|
|
sta YPOS
|
|
|
|
; lda LASER_DIRECTION
|
|
|
|
|
|
lda #<laser_sideways_sprite
|
|
sta INL
|
|
lda #>laser_sideways_sprite
|
|
sta INH
|
|
jsr put_sprite_crop
|
|
|
|
done_draw_laser:
|
|
rts
|
|
|
|
laser_sideways_sprite:
|
|
.byte 4,1
|
|
; .byte $3A,$cA,$3A,$cA
|
|
.byte $A3,$Ac,$A3,$Ac
|
|
|