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