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cliff: fix corruption bug

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This commit is contained in:
Vince Weaver 2024-08-31 22:06:34 -04:00
parent 2d4982c229
commit 5b103e8bcb
1 changed files with 34 additions and 20 deletions
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54
games/peasant_mini/cliff/hgr_sprite_bg_mask.s
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@ -81,32 +81,34 @@ hgr_draw_sprite_bg_mask:
; X = row counter at times (CURRENT_ROW is real one)
; Y = col counter
ldx #0 ; X is row counter
stx CURRENT_ROW
ldx #0 ; X is sprite counter
stx CURRENT_ROW ; zero row counter
hgr_sprite_bm_yloop:
lda MASK_COUNTDOWN
and #$3 ; only update every 4th
bne mask_good
txa
pha ; save X
;======================
; recalculate mask
txa
pha ; save sprite counter
lda CURRENT_ROW
clc
adc CURSOR_Y
tax
ldy CURSOR_X
tax ; X has row
ldy CURSOR_X ; Y has column
; FIXME: we have multi-width now
jsr update_bg_mask
pla ; restore X
pla ; restore sprite counter
tax
mask_good:
lda MASK
bne draw_sprite_skip
lda CURRENT_ROW
@ -121,19 +123,31 @@ mask_good:
lda hposn_high,Y
sta GBASH
;============================
; set up inner loop
ldy CURSOR_X
lda #0
sta SPRITE_TEMP
sta MASK_TEMP
hsbm_inner_loop:
lda MASK
bne draw_sprite_skip
;============================
; not masked so actually draw
h728_smc1:
lda $d000,X ; or in sprite
lda $d000,X ; load sprite value
sta TEMP_SPRITE
h728_smc3:
lda $d000,X ; mask with sprite mask
lda $d000,X ; load mask value
sta TEMP_MASK
@ -145,21 +159,21 @@ hsbm_draw_sprite_both:
eor (GBASL),Y ; store out
sta (GBASL),Y ; store out
iny
draw_sprite_skip:
inx
inx ; increment sprite pointer
iny ; increment column
hdsb_width_smc:
cpy #6
bne hsbm_inner_loop
inc MASK_COUNTDOWN
inc MASK_COUNTDOWN ; increment row
inc CURRENT_ROW
lda CURRENT_ROW