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Temporary fix for avoiding VRAM issues in non-layout OWR modes

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codemann8
2023-04-03 08:21:34 -05:00
parent bbf254d6f6
commit 9cef1ff32e
3 changed files with 20 additions and 18 deletions
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36
asm/owrando.asm
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@@ -860,31 +860,33 @@ OWNewDestination:
{
tya : sta $4202 : lda #16 : sta $4203 ;wait 8 cycles
rep #$20 : txa : nop : !add $4216 : tax ;a = offset to dest record
lda.w $0006,x : sta $06 ;set coord
lda.w $0008,x : sta $04 ;save dest OW slot/ID
lda.w $000a,x : sta $84 ;VRAM
ldy $20 : lda $418 : dec #2 : bpl + : ldy $22 : + sty $06
;;22 e0 e2 61c 61e - X
;;20 e6 e8 618 61a - Y
;keep current position if within incoming gap
lda.w $0000,x : and #$01ff : pha : lda.w $0002,x : and #$01ff : pha
ldy $20 : lda $418 : dec #2 : bpl + : ldy $22
+ tya : and #$01ff : cmp 3,s : !blt .adjustMainAxis
dec : cmp 1,s : !bge .adjustMainAxis
inc : pha : lda $06 : and #$fe00 : !add 1,s : sta $06 : pla
LDA.l OWMode : AND.w #$0007 : BEQ .noLayoutShuffle ;temporary fix until VRAM issues are solved
lda.w $0006,x : sta $06 ;set coord
lda.w $000a,x : sta $84 ;VRAM
tya : and #$01ff : cmp 3,s : !blt .adjustMainAxis
dec : cmp 1,s : !bge .adjustMainAxis
inc : pha : lda $06 : and #$fe00 : !add 1,s : sta $06 : pla
; adjust and set other VRAM addresses
lda.w $0006,x : pha : lda $06 : !sub 1,s
jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : pha ; number of tiles
lda $418 : dec #2 : bmi +
pla : pea $0000 : bra ++ ;pla : asl #7 : pha : bra ++ ; y-axis shifts VRAM by increments of 0x80 (disabled for now)
+ pla : asl : pha ; x-axis shifts VRAM by increments of 0x02
++ lda $84 : !add 1,s : sta $84 : pla : pla
; adjust and set other VRAM addresses
lda.w $0006,x : pha : lda $06 : !sub 1,s
jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : jsl DivideByTwoPreserveSign : pha ; number of tiles
lda $418 : dec #2 : bmi +
pla : pea $0000 : bra ++ ;pla : asl #7 : pha : bra ++ ; y-axis shifts VRAM by increments of 0x80 (disabled for now)
+ pla : asl : pha ; x-axis shifts VRAM by increments of 0x02
++ lda $84 : !add 1,s : sta $84 : pla : pla
.adjustMainAxis
LDA $84 : SEC : SBC #$0400 : AND #$0F00 : ASL : XBA : STA $88 ; vram
LDA $84 : SEC : SBC #$0010 : AND #$003E : LSR : STA $86
.adjustMainAxis
LDA $84 : SEC : SBC #$0400 : AND #$0F00 : ASL : XBA : STA $88 ; vram
LDA $84 : SEC : SBC #$0010 : AND #$003E : LSR : STA $86
.noLayoutShuffle
LDA.w $000F,X : AND.w #$00FF : STA.w $06FC ; position to walk to after transition (if non-zero)
LDY.w #$0000