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hgr: cycle-invariant hplot?

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This commit is contained in:
Vince Weaver 2018-09-09 16:56:27 -04:00
parent a5546691f7
commit 8d64914eb4
1 changed files with 52 additions and 17 deletions
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69
fireworks/hgr.s
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@ -82,6 +82,9 @@ bkgnd_loop:
msktbl: .byte $81,$82,$84,$88,$90,$A0,$C0 ; original
;====================================================
; HPOSN
; time = 9 + 61 + 31 + 22 + 42 + 21 + 23 = 209
hposn:
; F411
@ -156,23 +159,41 @@ hposn:
; 22
cpy #0 ; 2
beq done_mod
beq done_mod ; 3
theres_high:
; -1
clc ; 2
adc #4 ; make remainder match ; 2
pha ; 3
lda HGR_HORIZ ; 3
adc #36 ; 2
sta HGR_HORIZ ; 3
pla ; 4
;====
clc
adc #4 ; make remainder match
pha
lda HGR_HORIZ
adc #36
sta HGR_HORIZ
pla
cmp #7 ; 2
bcc done_mod_nop14 ; blt ; 3
; -1
sec ; 2
sbc #7 ; 2
inc HGR_HORIZ ; 5
jmp done_mod ; 3
;===========================
; Y=HIGH,NOR = 23+5 = 28 (14)
; Y=HIGH,R = 23+16 = 42
; Y=LOW = 5 (37 = 14+23)
cmp #7
bcc done_mod ; blt
done_mod_nop_23:
inc HGR_HORIZ,X ; (nop) ; 6
dec HGR_HORIZ,X ; (nop) ; 6
inc HGR_HORIZ ; (nop) ; 5
lda HGR_HORIZ ; (nop) ; 3
lda HGR_HORIZ ; (nop) ; 3
sec
sbc #7
inc HGR_HORIZ
done_mod_nop14:
inc HGR_HORIZ,X ; (nop) ; 6
dec HGR_HORIZ,X ; (nop) ; 6
nop ; 2
done_mod:
ldy HGR_HORIZ ; 2
@ -184,19 +205,33 @@ done_mod:
lsr ; 2
lda HGR_COLOR ; 3
sta HGR_BITS ; 3
bcs color_shift ; 3
;-1
rts ; 6
;===========
; 21
bcs color_shift ; 3
; cs = 3+20
;-1
; need 23 = 2+6+X = 15
inc HMASK,X ; nop ; 6
dec HMASK,X ; nop ; 6
lda HMASK ; nop ; 3
rts ; 6
;===========
; 23
hplot0:
; F457
jsr hposn ; 3+
jsr hposn ; 6+209
lda HGR_BITS ; 3
eor (GBASL),y ; 5
and HMASK ; 3
eor (GBASL),y ; 5
sta (GBASL),y ; 5
rts ; 6
;============
; 242
move_left_or_right:
; F465