mist: use fast lzsa everywhere
This commit is contained in:
Vince Weaver
parent
89404fe833
commit
2ef2626404
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@ -47,7 +47,7 @@ MIST: mist.o
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mist.o: mist.s zp.inc hardware.inc \
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graphics_island/mist_graphics.inc \
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gr_copy.s gr_unrle.s audio.s text_print.s decompress_small_v2.s
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gr_copy.s audio.s text_print.s decompress_fast_v2.s
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ca65 -o mist.o mist.s -l mist.lst
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####
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@ -2,6 +2,9 @@
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+ double link noise (once when leave, once when get there?)
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+ allow turning around
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+ adjust grab window on letter
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+ only grab when facing object
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+ add missing red book step
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Make game winnable:
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+ Allow access to all marker switches
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@ -0,0 +1,367 @@
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; note -- modified by Vince Weaver to assemble with ca65
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; -----------------------------------------------------------------------------
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; Decompress raw LZSA2 block.
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; Create one with lzsa -r -f2 <original_file> <compressed_file>
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;
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; in:
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; * LZSA_SRC_LO and LZSA_SRC_HI contain the compressed raw block address
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; * LZSA_DST_LO and LZSA_DST_HI contain the destination buffer address
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;
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; out:
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; * LZSA_DST_LO and LZSA_DST_HI contain the last decompressed byte address, +1
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;
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; -----------------------------------------------------------------------------
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; Backward decompression is also supported, use lzsa -r -b -f2 <original_file> <compressed_file>
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; To use it, also define BACKWARD_DECOMPRESS=1 before including this code!
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;
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; in:
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; * LZSA_SRC_LO/LZSA_SRC_HI must contain the address of the last byte of compressed data
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; * LZSA_DST_LO/LZSA_DST_HI must contain the address of the last byte of the destination buffer
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;
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; out:
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; * LZSA_DST_LO/LZSA_DST_HI contain the last decompressed byte address, -1
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;
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; -----------------------------------------------------------------------------
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;
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; Copyright (C) 2019 Emmanuel Marty, Peter Ferrie
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;
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; This software is provided 'as-is', without any express or implied
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; warranty. In no event will the authors be held liable for any damages
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; arising from the use of this software.
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;
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; Permission is granted to anyone to use this software for any purpose,
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; including commercial applications, and to alter it and redistribute it
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; freely, subject to the following restrictions:
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;
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; 1. The origin of this software must not be misrepresented; you must not
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; claim that you wrote the original software. If you use this software
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; in a product, an acknowledgment in the product documentation would be
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; appreciated but is not required.
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; 2. Altered source versions must be plainly marked as such, and must not be
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; misrepresented as being the original software.
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; 3. This notice may not be removed or altered from any source distribution.
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; -----------------------------------------------------------------------------
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;NIBCOUNT = $FC ; zero-page location for temp offset
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decompress_lzsa2_fast:
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sta LZSA_DST_HI
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ldy #$00
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sty LZSA_DST_LO
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sty NIBCOUNT
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decode_token:
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jsr getsrc ; read token byte: XYZ|LL|MMM
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pha ; preserve token on stack
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and #$18 ; isolate literals count (LL)
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beq no_literals ; skip if no literals to copy
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cmp #$18 ; LITERALS_RUN_LEN_V2?
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bcc prepare_copy_literals ; if less, count is directly embedded in token
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jsr getnibble ; get extra literals length nibble
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; add nibble to len from token
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adc #$02 ; (LITERALS_RUN_LEN_V2) minus carry
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cmp #$12 ; LITERALS_RUN_LEN_V2 + 15 ?
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bcc prepare_copy_literals_direct ; if less, literals count is complete
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jsr getsrc ; get extra byte of variable literals count
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; the carry is always set by the CMP above
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; GETSRC doesn't change it
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sbc #$EE ; overflow?
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jmp prepare_copy_literals_direct
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prepare_copy_literals_large:
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; handle 16 bits literals count
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; literals count = directly these 16 bits
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jsr getlargesrc ; grab low 8 bits in X, high 8 bits in A
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tay ; put high 8 bits in Y
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bcs prepare_copy_literals_high ; (*same as JMP PREPARE_COPY_LITERALS_HIGH but shorter)
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prepare_copy_literals:
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lsr ; shift literals count into place
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lsr
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lsr
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prepare_copy_literals_direct:
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tax
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bcs prepare_copy_literals_large ; if so, literals count is large
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prepare_copy_literals_high:
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txa
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beq copy_literals
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iny
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copy_literals:
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jsr getput ; copy one byte of literals
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dex
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bne copy_literals
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dey
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bne copy_literals
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no_literals:
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pla ; retrieve token from stack
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pha ; preserve token again
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asl
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bcs repmatch_or_large_offset ; 1YZ: rep-match or 13/16 bit offset
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asl ; 0YZ: 5 or 9 bit offset
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bcs offset_9_bit
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; 00Z: 5 bit offset
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ldx #$FF ; set offset bits 15-8 to 1
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jsr getcombinedbits ; rotate Z bit into bit 0, read nibble for bits 4-1
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ora #$E0 ; set bits 7-5 to 1
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bne got_offset_lo ; go store low byte of match offset and prepare match
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offset_9_bit: ; 01Z: 9 bit offset
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;;asl ; shift Z (offset bit 8) in place
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rol
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rol
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and #$01
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eor #$FF ; set offset bits 15-9 to 1
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bne got_offset_hi ; go store high byte, read low byte of match offset and prepare match
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; (*same as JMP GOT_OFFSET_HI but shorter)
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repmatch_or_large_offset:
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asl ; 13 bit offset?
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bcs repmatch_or_16bit ; handle rep-match or 16-bit offset if not
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; 10Z: 13 bit offset
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jsr getcombinedbits ; rotate Z bit into bit 8, read nibble for bits 12-9
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adc #$DE ; set bits 15-13 to 1 and substract 2 (to substract 512)
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bne got_offset_hi ; go store high byte, read low byte of match offset and prepare match
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; (*same as JMP GOT_OFFSET_HI but shorter)
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repmatch_or_16bit: ; rep-match or 16 bit offset
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;;ASL ; XYZ=111?
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bmi rep_match ; reuse previous offset if so (rep-match)
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; 110: handle 16 bit offset
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jsr getsrc ; grab high 8 bits
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got_offset_hi:
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tax
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jsr getsrc ; grab low 8 bits
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got_offset_lo:
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sta OFFSLO ; store low byte of match offset
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stx OFFSHI ; store high byte of match offset
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rep_match:
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.ifdef BACKWARD_DECOMPRESS
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; Backward decompression - substract match offset
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sec ; add dest + match offset
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lda putdst+1 ; low 8 bits
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OFFSLO = *+1
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sbc #$AA
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sta copy_match_loop+1 ; store back reference address
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lda putdst+2
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OFFSHI = *+1
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sbc #$AA ; high 8 bits
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sta copy_match_loop+2 ; store high 8 bits of address
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sec
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.else
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; Forward decompression - add match offset
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clc ; add dest + match offset
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lda putdst+1 ; low 8 bits
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OFFSLO = *+1
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adc #$AA
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sta copy_match_loop+1 ; store back reference address
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OFFSHI = *+1
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lda #$AA ; high 8 bits
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adc putdst+2
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sta copy_match_loop+2 ; store high 8 bits of address
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.endif
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pla ; retrieve token from stack again
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and #$07 ; isolate match len (MMM)
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adc #$01 ; add MIN_MATCH_SIZE_V2 and carry
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cmp #$09 ; MIN_MATCH_SIZE_V2 + MATCH_RUN_LEN_V2?
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bcc prepare_copy_match ; if less, length is directly embedded in token
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jsr getnibble ; get extra match length nibble
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; add nibble to len from token
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adc #$08 ; (MIN_MATCH_SIZE_V2 + MATCH_RUN_LEN_V2) minus carry
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cmp #$18 ; MIN_MATCH_SIZE_V2 + MATCH_RUN_LEN_V2 + 15?
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bcc prepare_copy_match ; if less, match length is complete
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jsr getsrc ; get extra byte of variable match length
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; the carry is always set by the CMP above
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; GETSRC doesn't change it
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sbc #$E8 ; overflow?
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prepare_copy_match:
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tax
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bcc prepare_copy_match_y ; if not, the match length is complete
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beq decompression_done ; if EOD code, bail
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; Handle 16 bits match length
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jsr getlargesrc ; grab low 8 bits in X, high 8 bits in A
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tay ; put high 8 bits in Y
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prepare_copy_match_y:
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txa
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beq copy_match_loop
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iny
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copy_match_loop:
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lda $AAAA ; get one byte of backreference
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jsr putdst ; copy to destination
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.ifdef BACKWARD_DECOMPRESS
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; Backward decompression -- put backreference bytes backward
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lda copy_match_loop+1
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beq getmatch_adj_hi
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getmatch_done:
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dec copy_match_loop+1
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.else
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; Forward decompression -- put backreference bytes forward
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inc copy_match_loop+1
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beq getmatch_adj_hi
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getmatch_done:
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.endif
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dex
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bne copy_match_loop
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dey
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bne copy_match_loop
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jmp decode_token
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.ifdef BACKWARD_DECOMPRESS
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getmatch_adj_hi:
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dec copy_match_loop+2
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jmp getmatch_done
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.else
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getmatch_adj_hi:
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inc copy_match_loop+2
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jmp getmatch_done
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.endif
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getcombinedbits:
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eor #$80
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asl
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php
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jsr getnibble ; get nibble into bits 0-3 (for offset bits 1-4)
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plp ; merge Z bit as the carry bit (for offset bit 0)
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combinedbitz:
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rol ; nibble -> bits 1-4; carry(!Z bit) -> bit 0 ; carry cleared
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decompression_done:
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rts
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getnibble:
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NIBBLES = *+1
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lda #$AA
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lsr NIBCOUNT
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bcc need_nibbles
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and #$0F ; isolate low 4 bits of nibble
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rts
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need_nibbles:
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inc NIBCOUNT
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jsr getsrc ; get 2 nibbles
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sta NIBBLES
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lsr
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lsr
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lsr
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lsr
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sec
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rts
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.ifdef BACKWARD_DECOMPRESS
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; Backward decompression -- get and put bytes backward
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getput:
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jsr getsrc
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putdst:
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LZSA_DST_LO = *+1
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LZSA_DST_HI = *+2
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sta $AAAA
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lda putdst+1
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beq putdst_adj_hi
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dec putdst+1
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rts
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putdst_adj_hi:
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dec putdst+2
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dec putdst+1
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rts
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getlargesrc:
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jsr getsrc ; grab low 8 bits
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tax ; move to X
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; fall through grab high 8 bits
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getsrc:
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LZSA_SRC_LO = *+1
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LZSA_SRC_HI = *+2
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lda $AAAA
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pha
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lda getsrc+1
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beq getsrc_adj_hi
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dec getsrc+1
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pla
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rts
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getsrc_adj_hi:
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dec getsrc+2
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dec getsrc+1
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pla
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rts
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.else
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; Forward decompression -- get and put bytes forward
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getput:
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jsr getsrc
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putdst:
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LZSA_DST_LO = *+1
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LZSA_DST_HI = *+2
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sta $AAAA
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inc putdst+1
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beq putdst_adj_hi
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rts
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putdst_adj_hi:
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inc putdst+2
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rts
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getlargesrc:
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jsr getsrc ; grab low 8 bits
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tax ; move to X
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; fall through grab high 8 bits
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getsrc:
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LZSA_SRC_LO = *+1
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LZSA_SRC_HI = *+2
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lda $AAAA
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inc getsrc+1
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beq getsrc_adj_hi
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rts
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getsrc_adj_hi:
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inc getsrc+2
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rts
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.endif
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@ -1,5 +1,5 @@
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5 HOME
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10 PRINT " LOADING MIST V0.2"
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10 PRINT " LOADING MIST V0.3"
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20 PRINT
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30 PRINT " ______"
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40 PRINT " A \/\/\/ SOFTWARE PRODUCTION"
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@ -9,6 +9,6 @@
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80 PRINT
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90 PRINT "SPOILERS (BECAUSE NOT ALL IMPLEMENTED)"
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100 PRINT " CLOCK: 2:40 2-2-1"
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105 PRINT " CLICK ALL SWITCHES EXCEPT DOCK"
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105 PRINT " ALL SWITCHES DOWN EXCEPT DOCK"
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110 PRINT " FIREPLACE PATTERN IN BOOK"
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120 PRINT CHR$(4);"BRUN LOADER"
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@ -1,201 +0,0 @@
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; LZ4 data decompressor for Apple II
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; Code by Peter Ferrie (qkumba) (peter.ferrie@gmail.com)
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; "LZ4 unpacker in 143 bytes (6502 version) (2013)"
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; http://pferrie.host22.com/misc/appleii.htm
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; This is that code, but with comments and labels added for clarity.
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; I also found a bug when decoding with runs of multiples of 256
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; which has since been fixed upstream.
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; For LZ4 reference see
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; https://github.com/lz4/lz4/wiki/lz4_Frame_format.md
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; LZ4 summary:
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;
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; HEADER:
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; Should: check for magic number 04 22 4d 18
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; FLG: 64 in our case (01=version, block.index=1, block.checksum=0
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; size=0, checksum=1, reserved
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; MAX Blocksize: 40 (64kB)
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; HEADER CHECKSUM: a7
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; BLOCK HEADER: 4 bytes (le) length If highest bit set, uncompressed!
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; data (see below), followed by checksum?
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; BLOCKS:
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; Token byte. High 4-bits literal length, low 4-bits copy length
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; + If literal length==15, then following byte gets added to length
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; If that byte was 255, then keep adding bytes until not 255
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; + The literal bytes follow. There may be zero of them
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; + Next is block copy info. little-endian 2-byte offset to
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; be subtracted from current read position indicating source
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; + The low 4-bits of the token are the copy length, which needs
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; 4 added to it. As with the literal length, if it is 15 then
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; you read a byte and add (and if that byte is 255, keep adding)
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; At end you have 4 byte end-of-block marker (all zeros?) then
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; 4 bytes of checksum (if marked in flags)
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; our code does that, so be sure to set end -8
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;LZ4_SRC EQU $00
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;LZ4_DST EQU $02
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;LZ4_END EQU $04
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;COUNT EQU $06
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;DELTA EQU $08
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;======================
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; LZ4 decode
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;======================
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; input buffer in LZ4_SRC
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; end of input in LZ4_END
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; output buffer in LZ4_DST
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lz4_decode:
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unpmain:
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ldy #0 ; used to index, always zero
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parsetoken:
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jsr getsrc ; get next token
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pha ; save for later (need bottom 4 bits)
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lsr ; number of literals in top 4 bits
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lsr ; so shift into place
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lsr
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lsr
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beq copymatches ; if zero, then no literals
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; jump ahead and copy
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jsr buildcount ; add up all the literal sizes
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; result is in ram[count+1]-1:A
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tax ; now in ram[count+1]-1:X
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jsr docopy ; copy the literals
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lda LZ4_SRC ; 16-bit compare
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cmp LZ4_END ; to see if we have reached the end
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lda LZ4_SRC+1
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sbc LZ4_END+1
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bcs done
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copymatches:
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jsr getsrc ; get 16-bit delta value
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sta DELTA
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jsr getsrc
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sta DELTA+1
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pla ; restore token
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and #$0f ; get bottom 4 bits
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; match count. 0 means 4
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; 15 means 19+, must be calculated
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jsr buildcount ; add up count bits, in ram[count+1]-:A
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clc
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adc #4 ; adjust count by 4 (minmatch)
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tax ; now in ramp[count+1]-1:X
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beq copy_no_adjust ; BUGFIX, don't increment if
|
||||
; exactly a multiple of 0x100
|
||||
bcc copy_no_adjust
|
||||
|
||||
inc COUNT+1 ; increment if we overflowed
|
||||
copy_no_adjust:
|
||||
|
||||
lda LZ4_SRC+1 ; save src on stack
|
||||
pha
|
||||
lda LZ4_SRC
|
||||
pha
|
||||
|
||||
sec ; subtract delta
|
||||
lda LZ4_DST ; from destination, make new src
|
||||
sbc DELTA
|
||||
sta LZ4_SRC
|
||||
lda LZ4_DST+1
|
||||
sbc DELTA+1
|
||||
sta LZ4_SRC+1
|
||||
|
||||
jsr docopy ; do the copy
|
||||
|
||||
pla ; restore the src
|
||||
sta LZ4_SRC
|
||||
pla
|
||||
sta LZ4_SRC+1
|
||||
|
||||
jmp parsetoken ; back to parsing tokens
|
||||
|
||||
done:
|
||||
pla
|
||||
rts
|
||||
|
||||
;=========
|
||||
; getsrc
|
||||
;=========
|
||||
; gets byte from src into A, increments pointer
|
||||
getsrc:
|
||||
lda (LZ4_SRC), Y ; get a byte from src
|
||||
inc LZ4_SRC ; increment pointer
|
||||
bne done_getsrc ; update 16-bit pointer
|
||||
inc LZ4_SRC+1 ; on 8-bit overflow
|
||||
done_getsrc:
|
||||
rts
|
||||
|
||||
;============
|
||||
; buildcount
|
||||
;============
|
||||
buildcount:
|
||||
ldx #1 ; high count starts at 1
|
||||
stx COUNT+1 ; (loops at zero?)
|
||||
cmp #$0f ; if LITERAL_COUNT < 15, we are done
|
||||
bne done_buildcount
|
||||
buildcount_loop:
|
||||
sta COUNT ; save LITERAL_COUNT (15)
|
||||
jsr getsrc ; get the next byte
|
||||
tax ; put in X
|
||||
clc
|
||||
adc COUNT ; add new byte to old value
|
||||
bcc bc_8bit_oflow ; if overflow, increment high byte
|
||||
inc COUNT+1
|
||||
bc_8bit_oflow:
|
||||
inx ; check if read value was 255
|
||||
beq buildcount_loop ; if it was, keep looping and adding
|
||||
done_buildcount:
|
||||
rts
|
||||
|
||||
;============
|
||||
; getput
|
||||
;============
|
||||
; gets a byte, then puts the byte
|
||||
getput:
|
||||
jsr getsrc
|
||||
; fallthrough to putdst
|
||||
|
||||
;=============
|
||||
; putdst
|
||||
;=============
|
||||
; store A into destination
|
||||
putdst:
|
||||
sta (LZ4_DST), Y ; store A into destination
|
||||
inc LZ4_DST ; increment 16-bit pointer
|
||||
bne putdst_end ; if overflow, increment top byte
|
||||
inc LZ4_DST+1
|
||||
putdst_end:
|
||||
rts
|
||||
|
||||
;=============================
|
||||
; docopy
|
||||
;=============================
|
||||
; copies ram[count+1]-1:X bytes
|
||||
; from src to dst
|
||||
docopy:
|
||||
|
||||
docopy_loop:
|
||||
jsr getput ; get/put byte
|
||||
dex ; decrement count
|
||||
bne docopy_loop ; if not zero, loop
|
||||
dec COUNT+1 ; if zero, decrement high byte
|
||||
bne docopy_loop ; if not zero, loop
|
||||
|
||||
rts
|
||||
13
mist/mist.s
13
mist/mist.s
|
|
@ -427,7 +427,7 @@ change_direction:
|
|||
lda (LOCATION_STRUCT_L),Y
|
||||
sta LZSA_SRC_HI
|
||||
lda #$c ; load to page $c00
|
||||
jsr decompress_lzsa2
|
||||
jsr decompress_lzsa2_fast
|
||||
|
||||
rts
|
||||
|
||||
|
|
@ -650,7 +650,7 @@ red_book_loop:
|
|||
lda #>red_book_static_lzsa
|
||||
sta LZSA_SRC_HI
|
||||
lda #$c ; load to page $c00
|
||||
jsr decompress_lzsa2
|
||||
jsr decompress_lzsa2_fast
|
||||
|
||||
jsr gr_copy_to_current
|
||||
|
||||
|
|
@ -664,7 +664,7 @@ red_book_loop:
|
|||
lda #>red_book_static2_lzsa
|
||||
sta LZSA_SRC_HI
|
||||
lda #$c ; load to page $c00
|
||||
jsr decompress_lzsa2
|
||||
jsr decompress_lzsa2_fast
|
||||
|
||||
jsr gr_copy_to_current
|
||||
|
||||
|
|
@ -687,7 +687,7 @@ red_book_loop:
|
|||
lda #>red_book_open_lzsa
|
||||
sta LZSA_SRC_HI
|
||||
lda #$c ; load to page $c00
|
||||
jsr decompress_lzsa2
|
||||
jsr decompress_lzsa2_fast
|
||||
|
||||
jsr gr_copy_to_current
|
||||
|
||||
|
|
@ -721,7 +721,7 @@ red_book_done:
|
|||
lda #>red_book_shelf_lzsa
|
||||
sta LZSA_SRC_HI
|
||||
lda #$c ; load to page $c00
|
||||
jsr decompress_lzsa2
|
||||
jsr decompress_lzsa2_fast
|
||||
|
||||
|
||||
rts
|
||||
|
|
@ -735,13 +735,12 @@ red_book_done:
|
|||
;==========================
|
||||
|
||||
.include "gr_copy.s"
|
||||
; .include "gr_unrle.s"
|
||||
.include "gr_offsets.s"
|
||||
.include "gr_pageflip.s"
|
||||
.include "gr_putsprite_crop.s"
|
||||
.include "text_print.s"
|
||||
.include "gr_fast_clear.s"
|
||||
.include "decompress_small_v2.s"
|
||||
.include "decompress_fast_v2.s"
|
||||
|
||||
.include "audio.s"
|
||||
|
||||
|
|
|
|||
|
|
@ -21,51 +21,20 @@ mist_start:
|
|||
bit HIRES
|
||||
bit FULLGR
|
||||
|
||||
|
||||
;===================
|
||||
; Init RTS disk code
|
||||
;===================
|
||||
|
||||
; jsr rts_init
|
||||
|
||||
;===================
|
||||
; Load graphics
|
||||
;===================
|
||||
reload_everything:
|
||||
; load MIST_TITLE.LZ4 to $a000
|
||||
; then decompress it to $2000 (HGR PAGE0)
|
||||
|
||||
; lda #<mist_title_filename
|
||||
; sta OUTL
|
||||
; lda #>mist_title_filename
|
||||
; sta OUTH
|
||||
; jsr opendir_filename ; open and read entire file into memory
|
||||
|
||||
; size in ldsizeh:ldsizel (f1/f0)
|
||||
|
||||
; clc
|
||||
lda #<file
|
||||
sta LZ4_SRC
|
||||
; adc ldsizel
|
||||
; sta LZ4_END
|
||||
|
||||
sta LZSA_SRC_LO
|
||||
lda #>file
|
||||
sta LZ4_SRC+1
|
||||
; adc ldsizeh
|
||||
; sta LZ4_END+1
|
||||
sta LZSA_SRC_HI
|
||||
|
||||
lda #<file_end
|
||||
sta LZ4_END
|
||||
lda #>file_end
|
||||
sta LZ4_END+1
|
||||
|
||||
lda #<$2000
|
||||
sta LZ4_DST
|
||||
lda #>$2000
|
||||
sta LZ4_DST+1
|
||||
|
||||
jsr lz4_decode
|
||||
lda #$20
|
||||
|
||||
jsr decompress_lzsa2_fast
|
||||
|
||||
|
||||
bit KEYRESET
|
||||
|
|
@ -81,23 +50,9 @@ keyloop:
|
|||
rts
|
||||
|
||||
|
||||
.include "decompress_fast_v2.s"
|
||||
|
||||
|
||||
|
||||
; .include "gr_putsprite.s"
|
||||
; .include "gr_offsets.s"
|
||||
; .include "gr_fast_clear.s"
|
||||
; .include "gr_hline.s"
|
||||
; .include "wait_keypress.s"
|
||||
.include "lz4_decode.s"
|
||||
; .include "rts.s"
|
||||
|
||||
|
||||
; filename to open is 30-character Apple text:
|
||||
;mist_title_filename: ; .byte "MIST_TITLE.LZ4",0
|
||||
; .byte 'M'|$80,'I'|$80,'S'|$80,'T'|$80,'_'|$80,'T'|$80,'I'|$80,'T'|$80
|
||||
; .byte 'L'|$80,'E'|$80,'.'|$80,'L'|$80,'Z'|$80,'4'|$80,$00
|
||||
|
||||
file:
|
||||
.incbin "graphics_title/MIST_TITLE.LZ4"
|
||||
file_end:
|
||||
.incbin "graphics_title/mist_title.lzsa"
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue