dos33fsprogs/games/riven_hgr/disk00_files/flip_pages.s

	;============================
	; flip pages
	;============================
page_flip:
flip_pages:
	lda	DRAW_PAGE						; 3
	beq	was_page1						; 2/3
was_page2:
	bit     PAGE2							; 4
	lda	#$0							; 2
	beq	done_pageflip						; 2/3
was_page1:
	bit	PAGE1							; 4
	lda	#$4							; 2
done_pageflip:
	sta	DRAW_PAGE						; 3

	rts
riven: work on captured animation 2024-07-05 01:23:30 -04:00			`;============================`
			`; flip pages`
			`;============================`
riven: add fade in 2024-07-05 12:16:27 -04:00			`page_flip:`
riven: work on captured animation 2024-07-05 01:23:30 -04:00			`flip_pages:`
			`lda DRAW_PAGE ; 3`
			`beq was_page1 ; 2/3`
			`was_page2:`
			`bit PAGE2 ; 4`
			`lda #$0 ; 2`
			`beq done_pageflip ; 2/3`
			`was_page1:`
			`bit PAGE1 ; 4`
			`lda #$4 ; 2`
			`done_pageflip:`
			`sta DRAW_PAGE ; 3`

			`rts`