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sprites: fire erases, but at what cost

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(lots of cycles)
This commit is contained in:
Vince Weaver 2019-06-13 10:30:37 -04:00
parent 1d5b990e81
commit 0a619ddef0
1 changed files with 49 additions and 18 deletions
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67
interlace_demo/sprites.s
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@ -223,15 +223,15 @@ display_loop:
; 4550 -- VBLANK
;-1821 -- draw ship (130*14)+1
; -829 -- erase ship (100*8)+(14*2)+1
; -278 -- erase fire
; -167 -- erase fire
; -31 -- move ship
; -17 -- move fire
; -306 -- draw fire (61*5)+1
; -428 -- draw fire (61*7)+1
; -61 -- keypress
; -28 -- handle fire press
; -8 -- loop
;=======
; 1171
; 1160
;================
; erase old ship
@ -277,13 +277,21 @@ display_loop:
;==========================
ldy FIRE_Y ; 3
jsr erase_fire ; 6+49
jsr erase_fire ; 6+49
jsr erase_fire ; 6+49
jsr erase_fire ; 6+49
jsr erase_fire ; 6+49
iny ; 2
jsr erase_fire ; 6+71
iny ; 2
iny ; 2
iny ; 2
iny ; 2
jsr erase_fire ; 6+71
;========
; 167
; jsr erase_fire ; 6+71
; jsr erase_fire ; 6+71
; jsr erase_fire ; 6+71
;====
; 278
; 388
@ -498,6 +506,20 @@ done_move:
;====
; 61
; line 5
iny ; 2
ldx #5 ; 2
jsr fire_line ; 6+51
;====
; 61
; line 6
iny ; 2
ldx #5 ; zero again ; 2
jsr fire_line ; 6+51
;====
; 61
pad_time:
@ -520,12 +542,12 @@ pad_time:
wait_loop:
; Try X=11 Y=19 cycles=1160
; nop
; nop
; Try X=4 Y=45 cycles=1171
ldy #45 ; 2
loop1: ldx #4 ; 2
ldy #19 ; 2
loop1: ldx #11 ; 2
loop2: dex ; 2
bne loop2 ; 2nt/3
dey ; 2
@ -850,28 +872,37 @@ fire_line:
; Erase a line of a fire
;========================
; Y = y value
; 27+11+11 = 49
; 31+29+11 = 71
erase_fire:
sty TEMPY ; 3
clc ; 2
tya ; 2
lsr ; 2
lsr ; 2
and #$fe ; 2
clc ; 2
adc #$8 ; 2
tay ; 2
lda gr_offsets,Y ; 4
sta OUTL ; 3
lda gr_offsets+1,Y ; 4
sta OUTH ; 3
;=======
; 27
; 31
ldy FIRE_X ; 3
lda #0 ; 2
sta (OUTL),Y ; 6
lda #$4 ; 2
clc ; 2
adc OUTH ; 3
sta OUTH ; 3
lda #0 ; 2
sta (OUTL),Y ; 6
;======
; 11
; 29
; ldx in smc should already be
; set to value from last draw?