mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-01-03 18:29:53 +00:00
vertical_scroll: add some more files
This commit is contained in:
Vince Weaver
parent
366ebbe08c
commit
93a4217cab
370
demos/vertical_scroll2/decompress_fast_v2.s
Normal file
370
demos/vertical_scroll2/decompress_fast_v2.s
Normal file
@ -0,0 +1,370 @@
|
||||
; note -- modified by Vince Weaver to assemble with ca65
|
||||
; in this case, A = page to decompress to
|
||||
; getsrc_smc+1, getsrc_smc+2 is src location
|
||||
|
||||
; -----------------------------------------------------------------------------
|
||||
; Decompress raw LZSA2 block.
|
||||
; Create one with lzsa -r -f2 <original_file> <compressed_file>
|
||||
;
|
||||
; in:
|
||||
; * LZSA_SRC_LO and LZSA_SRC_HI contain the compressed raw block address
|
||||
; * LZSA_DST_LO and LZSA_DST_HI contain the destination buffer address
|
||||
;
|
||||
; out:
|
||||
; * LZSA_DST_LO and LZSA_DST_HI contain the last decompressed byte address, +1
|
||||
;
|
||||
; -----------------------------------------------------------------------------
|
||||
; Backward decompression is also supported, use lzsa -r -b -f2 <original_file> <compressed_file>
|
||||
; To use it, also define BACKWARD_DECOMPRESS=1 before including this code!
|
||||
;
|
||||
; in:
|
||||
; * LZSA_SRC_LO/LZSA_SRC_HI must contain the address of the last byte of compressed data
|
||||
; * LZSA_DST_LO/LZSA_DST_HI must contain the address of the last byte of the destination buffer
|
||||
;
|
||||
; out:
|
||||
; * LZSA_DST_LO/LZSA_DST_HI contain the last decompressed byte address, -1
|
||||
;
|
||||
; -----------------------------------------------------------------------------
|
||||
;
|
||||
; Copyright (C) 2019 Emmanuel Marty, Peter Ferrie
|
||||
;
|
||||
; This software is provided 'as-is', without any express or implied
|
||||
; warranty. In no event will the authors be held liable for any damages
|
||||
; arising from the use of this software.
|
||||
;
|
||||
; Permission is granted to anyone to use this software for any purpose,
|
||||
; including commercial applications, and to alter it and redistribute it
|
||||
; freely, subject to the following restrictions:
|
||||
;
|
||||
; 1. The origin of this software must not be misrepresented; you must not
|
||||
; claim that you wrote the original software. If you use this software
|
||||
; in a product, an acknowledgment in the product documentation would be
|
||||
; appreciated but is not required.
|
||||
; 2. Altered source versions must be plainly marked as such, and must not be
|
||||
; misrepresented as being the original software.
|
||||
; 3. This notice may not be removed or altered from any source distribution.
|
||||
; -----------------------------------------------------------------------------
|
||||
|
||||
;NIBCOUNT = $FC ; zero-page location for temp offset
|
||||
|
||||
decompress_lzsa2_fast:
|
||||
|
||||
sta LZSA_DST_HI
|
||||
|
||||
ldy #$00
|
||||
sty LZSA_DST_LO
|
||||
sty NIBCOUNT
|
||||
|
||||
decode_token:
|
||||
jsr getsrc ; read token byte: XYZ|LL|MMM
|
||||
pha ; preserve token on stack
|
||||
|
||||
and #$18 ; isolate literals count (LL)
|
||||
beq no_literals ; skip if no literals to copy
|
||||
cmp #$18 ; LITERALS_RUN_LEN_V2?
|
||||
bcc prepare_copy_literals ; if less, count is directly embedded in token
|
||||
|
||||
jsr getnibble ; get extra literals length nibble
|
||||
; add nibble to len from token
|
||||
adc #$02 ; (LITERALS_RUN_LEN_V2) minus carry
|
||||
cmp #$12 ; LITERALS_RUN_LEN_V2 + 15 ?
|
||||
bcc prepare_copy_literals_direct ; if less, literals count is complete
|
||||
|
||||
jsr getsrc ; get extra byte of variable literals count
|
||||
; the carry is always set by the CMP above
|
||||
; GETSRC doesn't change it
|
||||
sbc #$EE ; overflow?
|
||||
jmp prepare_copy_literals_direct
|
||||
|
||||
prepare_copy_literals_large:
|
||||
; handle 16 bits literals count
|
||||
; literals count = directly these 16 bits
|
||||
jsr getlargesrc ; grab low 8 bits in X, high 8 bits in A
|
||||
tay ; put high 8 bits in Y
|
||||
bcs prepare_copy_literals_high ; (*same as JMP PREPARE_COPY_LITERALS_HIGH but shorter)
|
||||
|
||||
prepare_copy_literals:
|
||||
lsr ; shift literals count into place
|
||||
lsr
|
||||
lsr
|
||||
|
||||
prepare_copy_literals_direct:
|
||||
tax
|
||||
bcs prepare_copy_literals_large ; if so, literals count is large
|
||||
|
||||
prepare_copy_literals_high:
|
||||
txa
|
||||
beq copy_literals
|
||||
iny
|
||||
|
||||
copy_literals:
|
||||
jsr getput ; copy one byte of literals
|
||||
dex
|
||||
bne copy_literals
|
||||
dey
|
||||
bne copy_literals
|
||||
|
||||
no_literals:
|
||||
pla ; retrieve token from stack
|
||||
pha ; preserve token again
|
||||
asl
|
||||
bcs repmatch_or_large_offset ; 1YZ: rep-match or 13/16 bit offset
|
||||
|
||||
asl ; 0YZ: 5 or 9 bit offset
|
||||
bcs offset_9_bit
|
||||
|
||||
; 00Z: 5 bit offset
|
||||
|
||||
ldx #$FF ; set offset bits 15-8 to 1
|
||||
|
||||
jsr getcombinedbits ; rotate Z bit into bit 0, read nibble for bits 4-1
|
||||
ora #$E0 ; set bits 7-5 to 1
|
||||
bne got_offset_lo ; go store low byte of match offset and prepare match
|
||||
|
||||
offset_9_bit: ; 01Z: 9 bit offset
|
||||
;;asl ; shift Z (offset bit 8) in place
|
||||
rol
|
||||
rol
|
||||
and #$01
|
||||
eor #$FF ; set offset bits 15-9 to 1
|
||||
bne got_offset_hi ; go store high byte, read low byte of match offset and prepare match
|
||||
; (*same as JMP GOT_OFFSET_HI but shorter)
|
||||
|
||||
repmatch_or_large_offset:
|
||||
asl ; 13 bit offset?
|
||||
bcs repmatch_or_16bit ; handle rep-match or 16-bit offset if not
|
||||
|
||||
; 10Z: 13 bit offset
|
||||
|
||||
jsr getcombinedbits ; rotate Z bit into bit 8, read nibble for bits 12-9
|
||||
adc #$DE ; set bits 15-13 to 1 and substract 2 (to substract 512)
|
||||
bne got_offset_hi ; go store high byte, read low byte of match offset and prepare match
|
||||
; (*same as JMP GOT_OFFSET_HI but shorter)
|
||||
|
||||
repmatch_or_16bit: ; rep-match or 16 bit offset
|
||||
;;ASL ; XYZ=111?
|
||||
bmi rep_match ; reuse previous offset if so (rep-match)
|
||||
|
||||
; 110: handle 16 bit offset
|
||||
jsr getsrc ; grab high 8 bits
|
||||
got_offset_hi:
|
||||
tax
|
||||
jsr getsrc ; grab low 8 bits
|
||||
got_offset_lo:
|
||||
sta OFFSLO ; store low byte of match offset
|
||||
stx OFFSHI ; store high byte of match offset
|
||||
|
||||
rep_match:
|
||||
.ifdef BACKWARD_DECOMPRESS
|
||||
|
||||
; Backward decompression - substract match offset
|
||||
|
||||
sec ; add dest + match offset
|
||||
lda putdst+1 ; low 8 bits
|
||||
OFFSLO = *+1
|
||||
sbc #$AA
|
||||
sta copy_match_loop+1 ; store back reference address
|
||||
lda putdst+2
|
||||
OFFSHI = *+1
|
||||
sbc #$AA ; high 8 bits
|
||||
sta copy_match_loop+2 ; store high 8 bits of address
|
||||
sec
|
||||
|
||||
.else
|
||||
|
||||
; Forward decompression - add match offset
|
||||
|
||||
clc ; add dest + match offset
|
||||
lda putdst+1 ; low 8 bits
|
||||
OFFSLO = *+1
|
||||
adc #$AA
|
||||
sta copy_match_loop+1 ; store back reference address
|
||||
OFFSHI = *+1
|
||||
lda #$AA ; high 8 bits
|
||||
adc putdst+2
|
||||
sta copy_match_loop+2 ; store high 8 bits of address
|
||||
.endif
|
||||
|
||||
pla ; retrieve token from stack again
|
||||
and #$07 ; isolate match len (MMM)
|
||||
adc #$01 ; add MIN_MATCH_SIZE_V2 and carry
|
||||
cmp #$09 ; MIN_MATCH_SIZE_V2 + MATCH_RUN_LEN_V2?
|
||||
bcc prepare_copy_match ; if less, length is directly embedded in token
|
||||
|
||||
jsr getnibble ; get extra match length nibble
|
||||
; add nibble to len from token
|
||||
adc #$08 ; (MIN_MATCH_SIZE_V2 + MATCH_RUN_LEN_V2) minus carry
|
||||
cmp #$18 ; MIN_MATCH_SIZE_V2 + MATCH_RUN_LEN_V2 + 15?
|
||||
bcc prepare_copy_match ; if less, match length is complete
|
||||
|
||||
jsr getsrc ; get extra byte of variable match length
|
||||
; the carry is always set by the CMP above
|
||||
; GETSRC doesn't change it
|
||||
sbc #$E8 ; overflow?
|
||||
|
||||
prepare_copy_match:
|
||||
tax
|
||||
bcc prepare_copy_match_y ; if not, the match length is complete
|
||||
beq decompression_done ; if EOD code, bail
|
||||
|
||||
; Handle 16 bits match length
|
||||
jsr getlargesrc ; grab low 8 bits in X, high 8 bits in A
|
||||
tay ; put high 8 bits in Y
|
||||
|
||||
prepare_copy_match_y:
|
||||
txa
|
||||
beq copy_match_loop
|
||||
iny
|
||||
|
||||
copy_match_loop:
|
||||
lda $AAAA ; get one byte of backreference
|
||||
jsr putdst ; copy to destination
|
||||
|
||||
.ifdef BACKWARD_DECOMPRESS
|
||||
|
||||
; Backward decompression -- put backreference bytes backward
|
||||
|
||||
lda copy_match_loop+1
|
||||
beq getmatch_adj_hi
|
||||
getmatch_done:
|
||||
dec copy_match_loop+1
|
||||
|
||||
.else
|
||||
|
||||
; Forward decompression -- put backreference bytes forward
|
||||
|
||||
inc copy_match_loop+1
|
||||
beq getmatch_adj_hi
|
||||
getmatch_done:
|
||||
|
||||
.endif
|
||||
|
||||
dex
|
||||
bne copy_match_loop
|
||||
dey
|
||||
bne copy_match_loop
|
||||
jmp decode_token
|
||||
|
||||
.ifdef BACKWARD_DECOMPRESS
|
||||
|
||||
getmatch_adj_hi:
|
||||
dec copy_match_loop+2
|
||||
jmp getmatch_done
|
||||
|
||||
.else
|
||||
|
||||
getmatch_adj_hi:
|
||||
inc copy_match_loop+2
|
||||
jmp getmatch_done
|
||||
.endif
|
||||
|
||||
getcombinedbits:
|
||||
eor #$80
|
||||
asl
|
||||
php
|
||||
|
||||
jsr getnibble ; get nibble into bits 0-3 (for offset bits 1-4)
|
||||
plp ; merge Z bit as the carry bit (for offset bit 0)
|
||||
combinedbitz:
|
||||
rol ; nibble -> bits 1-4; carry(!Z bit) -> bit 0 ; carry cleared
|
||||
decompression_done:
|
||||
rts
|
||||
|
||||
getnibble:
|
||||
NIBBLES = *+1
|
||||
lda #$AA
|
||||
lsr NIBCOUNT
|
||||
bcc need_nibbles
|
||||
and #$0F ; isolate low 4 bits of nibble
|
||||
rts
|
||||
|
||||
need_nibbles:
|
||||
inc NIBCOUNT
|
||||
jsr getsrc ; get 2 nibbles
|
||||
sta NIBBLES
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
lsr
|
||||
sec
|
||||
rts
|
||||
|
||||
.ifdef BACKWARD_DECOMPRESS
|
||||
|
||||
; Backward decompression -- get and put bytes backward
|
||||
|
||||
getput:
|
||||
jsr getsrc
|
||||
putdst:
|
||||
LZSA_DST_LO = *+1
|
||||
LZSA_DST_HI = *+2
|
||||
sta $AAAA
|
||||
lda putdst+1
|
||||
beq putdst_adj_hi
|
||||
dec putdst+1
|
||||
rts
|
||||
|
||||
putdst_adj_hi:
|
||||
dec putdst+2
|
||||
dec putdst+1
|
||||
rts
|
||||
|
||||
getlargesrc:
|
||||
jsr getsrc ; grab low 8 bits
|
||||
tax ; move to X
|
||||
; fall through grab high 8 bits
|
||||
|
||||
getsrc:
|
||||
LZSA_SRC_LO = *+1
|
||||
LZSA_SRC_HI = *+2
|
||||
lda $AAAA
|
||||
pha
|
||||
lda getsrc+1
|
||||
beq getsrc_adj_hi
|
||||
dec getsrc+1
|
||||
pla
|
||||
rts
|
||||
|
||||
getsrc_adj_hi:
|
||||
dec getsrc+2
|
||||
dec getsrc+1
|
||||
pla
|
||||
rts
|
||||
|
||||
.else
|
||||
|
||||
; Forward decompression -- get and put bytes forward
|
||||
|
||||
getput:
|
||||
jsr getsrc
|
||||
putdst:
|
||||
LZSA_DST_LO = *+1
|
||||
LZSA_DST_HI = *+2
|
||||
sta $AAAA
|
||||
inc putdst+1
|
||||
beq putdst_adj_hi
|
||||
rts
|
||||
|
||||
putdst_adj_hi:
|
||||
inc putdst+2
|
||||
rts
|
||||
|
||||
getlargesrc:
|
||||
jsr getsrc ; grab low 8 bits
|
||||
tax ; move to X
|
||||
; fall through grab high 8 bits
|
||||
|
||||
getsrc:
|
||||
getsrc_smc:
|
||||
LZSA_SRC_LO = *+1
|
||||
LZSA_SRC_HI = *+2
|
||||
lda $AAAA
|
||||
inc getsrc+1
|
||||
beq getsrc_adj_hi
|
||||
rts
|
||||
|
||||
getsrc_adj_hi:
|
||||
inc getsrc+2
|
||||
rts
|
||||
.endif
|
||||
|
||||
4
demos/vertical_scroll2/hello.bas
Normal file
4
demos/vertical_scroll2/hello.bas
Normal file
@ -0,0 +1,4 @@
|
||||
5 HOME
|
||||
10 PRINT "GR VERTICAL SCROLLER"
|
||||
' 20 PRINT CHR$(4)+"BRUN SCROLLER"
|
||||
20 PRINT CHR$(4)"CATALOG"
|
||||
Loading…
Reference in New Issue
Block a user