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sprites: firing!

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This commit is contained in:
Vince Weaver 2019-06-12 23:49:02 -04:00
parent cb33e23442
commit fb6801bc84
1 changed files with 39 additions and 7 deletions
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46
interlace_demo/sprites.s
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@ -221,15 +221,16 @@ display_loop:
;======================================================
; 4550 -- VBLANK
; 1821 -- draw ship (130*14)+1
; 829 -- erase ship (100*8)+(14*2)+1
;-1821 -- draw ship (130*14)+1
; -829 -- erase ship (100*8)+(14*2)+1
; -31 -- move ship
; -17 -- move fire
; -306 -- draw fire (61*5)+1
; -61 -- keypress
; -24 -- handle fire press
; -8 -- loop
;=======
; 1477
; 1453
;================
; erase old ship
@ -507,12 +508,11 @@ pad_time:
wait_loop:
; Try X=6 Y=41 cycles=1477
; Try X=175 Y=2 cycles=1763 R20
; Try X=1 Y=132 cycles=1453
ldy #41 ; 2
loop1: ldx #6 ; 2
ldy #132 ; 2
loop1: ldx #1 ; 2
loop2: dex ; 2
bne loop2 ; 2nt/3
dey ; 2
@ -524,6 +524,33 @@ wait_loop_end:
jsr handle_keypress ; 6+55
;===============
; handle fire
; FIRE: 24
; no FIRE: 6 [18]
lda FIRE ; 3
beq no_firing ; 3
; -1
lda #0 ; 2
sta FIRE ; 3
lda YPOS ; 3
sta FIRE_Y ; 3
lda #7 ; 2
sta FIRE_X ; 3
jmp really_no_firing ; 3
no_firing:
inc TEMP ; 5
inc TEMP ; 5
inc TEMP ; 5
lda TEMP ; 3
really_no_firing:
;===============
; check for end
@ -534,6 +561,11 @@ wait_loop_end:
done_level:
rts
.align $100
;=======================
; handle keypress