mirror of
https://github.com/a2-4am/4cade.git
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88 lines
3.0 KiB
Plaintext
88 lines
3.0 KiB
Plaintext
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;license:MIT
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;(c) 2018-2020 by 4am & qkumba
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;
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; Exomizer glue functions
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;
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; Public functions
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; - DecompressHGR
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; - DecompressDHGR
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; - DecompressSHR
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;
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DECRUNCH = $0314 ; decrunch entry point
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;------------------------------------------------------------------------------
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; DecompressSHR
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;
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; in: compressed SHR loaded to $1FF8+
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; file size in sizelo2/sizehi2 as set by ProRWTS2
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; out: decompressed SHR at $2000..$9FFF
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; $00A7..$00A8 clobbered by decompressor
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; $00AE..$00AF clobbered by decompressor
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; $00FC..$00FF clobbered by decompressor
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; $0200..$03CB clobbered by decompressor
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;------------------------------------------------------------------------------
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DecompressSHR
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lda #$1F
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+HIDE_NEXT_2_BYTES
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; /!\ execution falls through here
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;------------------------------------------------------------------------------
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; DecompressHGR
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;
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; in: compressed HGR loaded to $3FF8+
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; file size in sizelo2/sizehi2 as set by ProRWTS2
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; out: decompressed HGR at $4000..$5FFF
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; $00A7..$00A8 clobbered by decompressor
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; $00AE..$00AF clobbered by decompressor
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; $00FC..$00FF clobbered by decompressor
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; $0200..$03CB clobbered by decompressor
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;------------------------------------------------------------------------------
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DecompressHGR
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lda #$3F
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pha
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jsr SwitchToBank2
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jsr EnableAccelerator
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lda sizehi2
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pha
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lda sizelo2
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pha
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lda #>(@loaddecrunch - 1)
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pha
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lda #<(@loaddecrunch - 1)
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pha
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lda auxreq
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bne +
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jmp LoadFile ; load decompression code to $200
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+ jmp LoadAuxFile ; load decompression code to $200/aux
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@loaddecrunch
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!word kRootDirectory
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!word kDecrunchFile
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!word $200
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ldx auxreq
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sta READMAINMEM,x ; X = 0 or 1, so this will be READMAINMEM or READAUXMEM
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sta WRITEMAINMEM,x ; X = 0 or 1, so this will be WRITEMAINMEM or WRITEAUXMEM
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jsr DECRUNCH ; loaded from separate file
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jsr SwitchToBank2
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jmp DisableAcceleratorAndSwitchToBank1
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;------------------------------------------------------------------------------
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; DecompressDHGR
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;
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; in: compressed DHGR loaded to aux $3FF8+
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; file size in sizelo2/sizehi2 as set by ProRWTS2
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; out: decompressed HGR at $4000..$5FFF/main and $4000..$5FFF/aux
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; $6000..$7FFF/aux clobbered by decompressor
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; $00A7..$00A8 clobbered by decompressor
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; $00AE..$00AF clobbered by decompressor
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; $00FC..$00FF clobbered by decompressor
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; $0200..$03CB clobbered by decompressor
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;------------------------------------------------------------------------------
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DecompressDHGR
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jsr DecompressHGR
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sta WRITEMAINMEM
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lda #$60
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sta PageFrom+2
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lda #$40
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jmp CopyHGR ; switches back to READMAINMEM on exit
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