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fill in scanlines during tiering

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Brooke Vibber 2024-12-31 22:10:27 -08:00
commit c424f1b8bc
2 changed files with 17 additions and 2 deletions
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mandel.s
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@ -1201,6 +1201,10 @@ shift_loop:
jmp shift_loop
shift_done:
ldy fill_level
ldx fill_masks,y
inx
; pixel_offset = temp >> 2
lda temp
lsr a
@ -1208,12 +1212,25 @@ shift_done:
sta pixel_offset
tay
draw_pixel:
; read, mask, or, write
lda (pixel_ptr),y
and pixel_mask
ora pixel_color
sta (pixel_ptr),y
dex
beq done
clc
lda #40
adc pixel_ptr
sta pixel_ptr
lda #0
adc pixel_ptr + 1
sta pixel_ptr + 1
jmp draw_pixel
done:
rts
.endproc