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50 lines
1.6 KiB
NASM
50 lines
1.6 KiB
NASM
;; Example using upkr depacker for screens slideshow
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OPT --syntax=abf
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DEVICE ZXSPECTRUM48,$8FFF
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ORG $9000
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compressed_scr_files: ; border color byte + upkr-packed .scr file
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DB 1
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INCBIN "screens/Grongy - ZX Spectrum (2022).scr.upk"
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DB 7
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INCBIN "screens/Schafft - Poison (2017).scr.upk"
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DB 0
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INCBIN "screens/diver - Mercenary 4. The Heaven's Devil (2014) (Forever 2014 Olympic Edition, 1).scr.upk"
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DB 6
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INCBIN "screens/diver - Back to Bjork (2015).scr.upk"
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.e:
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start:
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di
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; OPT --zxnext
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; nextreg 7,3 ; ZX Next: switch to 28Mhz
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ld ix,compressed_scr_files
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.slideshow_loop
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; set BORDER for next image
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ldi a,(ix) ; fake: ld a,(ix) : inc ix
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out (254),a
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; call unpack of next image directly into VRAM
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ld hl,$4000 ; target VRAM
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exx
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; IX = packed data, HL' = destination ($4000)
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; returned IX will point right after the packed data
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call upkr.unpack
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; do some busy loop with CPU to delay between images
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ld bc,$AA00
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.delay:
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.8 ex (sp),ix
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dec c
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jr nz,.delay
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djnz .delay
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; check if all images were displayed, loop around from first one then
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ld a,ixl
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cp low compressed_scr_files.e
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jr z,start
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jr .slideshow_loop
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; include the depacker library, optionally putting probs array buffer near end of RAM
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DEFINE UPKR_PROBS_ORIGIN $FA00 ; if not defined, array will be put after unpack code
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INCLUDE "../unpack.asm"
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SAVESNA "example.sna",start
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