mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-01 01:06:33 +00:00
192 lines
3.1 KiB
ArmAsm
192 lines
3.1 KiB
ArmAsm
|
|
;============================================
|
|
; gr, "fade" out. Badly fake a pallette fade
|
|
;============================================
|
|
; Image to fade out should be in $C00
|
|
fade_out:
|
|
|
|
lda #<fade_lookup
|
|
sta GBASL
|
|
lda #>fade_lookup
|
|
sta GBASH
|
|
|
|
jsr gr_fade
|
|
jsr page_flip
|
|
|
|
lda #200
|
|
jsr WAIT
|
|
|
|
lda #<(fade_lookup+16)
|
|
sta GBASL
|
|
lda #>(fade_lookup+16)
|
|
sta GBASH
|
|
|
|
jsr gr_fade
|
|
jsr page_flip
|
|
|
|
lda #200
|
|
jsr WAIT
|
|
|
|
lda #<(fade_lookup+32)
|
|
sta GBASL
|
|
lda #>(fade_lookup+32)
|
|
sta GBASH
|
|
|
|
jsr gr_fade
|
|
jsr page_flip
|
|
|
|
lda #200
|
|
jsr WAIT
|
|
|
|
lda #<(fade_lookup+48)
|
|
sta GBASL
|
|
lda #>(fade_lookup+48)
|
|
sta GBASH
|
|
|
|
jsr gr_fade
|
|
jsr page_flip
|
|
|
|
lda #200
|
|
jsr WAIT
|
|
|
|
rts
|
|
|
|
;===========================================
|
|
; gr, "fade" in. Badly fake a pallette fade
|
|
;===========================================
|
|
; Image to fade in should be in $C00
|
|
fade_in:
|
|
|
|
lda #<(fade_lookup+48)
|
|
sta GBASL
|
|
lda #>(fade_lookup+48)
|
|
sta GBASH
|
|
|
|
jsr gr_fade
|
|
jsr page_flip
|
|
|
|
lda #200
|
|
jsr WAIT
|
|
|
|
lda #<(fade_lookup+32)
|
|
sta GBASL
|
|
lda #>(fade_lookup+32)
|
|
sta GBASH
|
|
|
|
jsr gr_fade
|
|
jsr page_flip
|
|
|
|
lda #200
|
|
jsr WAIT
|
|
|
|
lda #<(fade_lookup+16)
|
|
sta GBASL
|
|
lda #>(fade_lookup+16)
|
|
sta GBASH
|
|
|
|
jsr gr_fade
|
|
jsr page_flip
|
|
|
|
lda #200
|
|
jsr WAIT
|
|
|
|
lda #<(fade_lookup+0)
|
|
sta GBASL
|
|
lda #>(fade_lookup+0)
|
|
sta GBASH
|
|
|
|
jsr gr_fade
|
|
jsr page_flip
|
|
|
|
lda #200
|
|
jsr WAIT
|
|
|
|
rts
|
|
|
|
;================================================
|
|
; Fade in/out lowres graphics
|
|
; GR image should be in $C00
|
|
; pointer to fade table in GBASL/GBASH
|
|
|
|
gr_fade:
|
|
|
|
ldx #0 ; set ypos to zero ; 2
|
|
|
|
gr_fade_loop:
|
|
lda gr_offsets,X ; lookup low byte for line addr ; 4+
|
|
|
|
sta gr_fade_line1+1 ; out and in are the same ; 4
|
|
sta gr_fade_line2+1 ; 4
|
|
|
|
lda gr_offsets+1,X ; lookup high byte for line addr ; 4+
|
|
clc ; 2
|
|
adc DRAW_PAGE ; 3
|
|
sta gr_fade_line2+2 ; 4
|
|
|
|
lda gr_offsets+1,X ; lookup high byte for line addr ; 4+
|
|
adc #$8 ; for now, fixed 0xc ; 2
|
|
sta gr_fade_line1+2 ; 4
|
|
|
|
ldy #0 ; set xpos counter to 0 ; 2
|
|
|
|
|
|
cpx #$8 ; don't want to copy bottom 4*40 ; 2
|
|
bcs gr_fade_above4 ; 2nt/3
|
|
|
|
gr_fade_below4:
|
|
ldy #119 ; for early ones, copy 120 bytes ; 2
|
|
bcc gr_fade_line1 ; ; 3
|
|
|
|
gr_fade_above4: ; for last four, just copy 80 bytes
|
|
ldy #79 ; 2
|
|
|
|
gr_fade_line1:
|
|
lda $ffff,Y ; load a byte (self modified) ; 4+
|
|
pha
|
|
|
|
sty TEMPY ; save Y
|
|
|
|
; do high nibble
|
|
and #$f0
|
|
lsr
|
|
lsr
|
|
lsr
|
|
lsr
|
|
|
|
tay
|
|
lda (GBASL),Y
|
|
and #$f0
|
|
sta TEMP
|
|
|
|
; do low nibble
|
|
pla
|
|
and #$0f
|
|
|
|
tay
|
|
lda (GBASL),Y
|
|
and #$0f
|
|
ora TEMP
|
|
|
|
ldy TEMPY ; restore Y
|
|
|
|
gr_fade_line2:
|
|
sta $ffff,Y ; store a byte (self modified) ; 5
|
|
dey ; decrement pointer ; 2
|
|
bpl gr_fade_line1 ; ; 2nt/3
|
|
|
|
gr_fade_line_done:
|
|
inx ; increment ypos value ; 2
|
|
inx ; twice, as address is 2 bytes ; 2
|
|
cpx #16 ; there are 8*2 of them ; 2
|
|
bne gr_fade_loop ; if not, loop ; 3
|
|
rts ; 6
|
|
|
|
|
|
|
|
; Fade paramaters
|
|
fade_lookup:
|
|
.byte $00,$11,$22,$33,$44,$55,$66,$77, $88,$99,$aa,$bb,$cc,$dd,$ee,$ff
|
|
.byte $00,$00,$00,$22,$00,$00,$22,$55, $55,$88,$55,$33,$44,$88,$44,$77
|
|
.byte $00,$00,$00,$00,$00,$00,$55,$00, $00,$00,$00,$00,$88,$00,$00,$55
|
|
.byte $00,$00,$00,$00,$00,$00,$00,$00, $00,$00,$00,$00,$00,$00,$00,$00
|