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https://github.com/deater/dos33fsprogs.git
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megademo: compress the image
This commit is contained in:
Vince Weaver
parent
69a34222aa
commit
30e1173935
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@ -18,12 +18,18 @@ MEGADEMO: megademo.o
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ld65 -o MEGADEMO megademo.o -C ../linker_scripts/apple2_1000.inc
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megademo.o: megademo.s \
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c64.img
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zp.inc hardware.inc \
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c64.img.lz4
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ca65 -o megademo.o megademo.s -l megademo.lst
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####
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c64.img.lz4: c64.img
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lz4 -f -16 c64.img
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####
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c64.img: c64_updated.png
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../hgr-utils/png2hgr c64_updated.png > c64.img
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207
megademo/lz4_decode.s
Normal file
207
megademo/lz4_decode.s
Normal file
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@ -0,0 +1,207 @@
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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) If highest bit set, uncompressed!
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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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;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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;UNPACK_BUFFER EQU $5E00 ; offset of first unpacked byte
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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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; output buffer hardcoded still
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; size in ENDH:ENDL
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lz4_decode:
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; lda LZ4_SRC ; packed data offset
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; clc
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; adc LZ4_END
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; sta LZ4_END
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; lda LZ4_SRC+1
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; adc LZ4_END+1
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; sta LZ4_END+1
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; lda #>UNPACK_BUFFER ; original unpacked data offset
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; sta LZ4_DST+1
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; lda #<UNPACK_BUFFER
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; sta LZ4_DST
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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
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; exactly a multiple of 0x100
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bcc copy_no_adjust
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inc COUNT+1 ; increment if we overflowed
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copy_no_adjust:
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lda LZ4_SRC+1 ; save src on stack
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pha
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lda LZ4_SRC
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pha
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sec ; subtract delta
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lda LZ4_DST ; from destination, make new src
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sbc DELTA
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sta LZ4_SRC
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lda LZ4_DST+1
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sbc DELTA+1
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sta LZ4_SRC+1
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jsr docopy ; do the copy
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pla ; restore the src
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sta LZ4_SRC
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pla
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sta LZ4_SRC+1
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jmp parsetoken ; back to parsing tokens
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done:
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pla
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rts
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;=========
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; getsrc
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;=========
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; gets byte from src into A, increments pointer
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getsrc:
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lda (LZ4_SRC), Y ; get a byte from src
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inc LZ4_SRC ; increment pointer
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bne done_getsrc ; update 16-bit pointer
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inc LZ4_SRC+1 ; on 8-bit overflow
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done_getsrc:
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rts
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;============
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; buildcount
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;============
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buildcount:
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ldx #1 ; high count starts at 1
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stx COUNT+1 ; (loops at zero?)
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cmp #$0f ; if LITERAL_COUNT < 15, we are done
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bne done_buildcount
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buildcount_loop:
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sta COUNT ; save LITERAL_COUNT (15)
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jsr getsrc ; get the next byte
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tax ; put in X
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clc
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adc COUNT ; add new byte to old value
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bcc bc_8bit_oflow ; if overflow, increment high byte
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inc COUNT+1
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bc_8bit_oflow:
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inx ; check if read value was 255
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beq buildcount_loop ; if it was, keep looping and adding
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done_buildcount:
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rts
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;============
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; getput
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;============
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; gets a byte, then puts the byte
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getput:
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jsr getsrc
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; fallthrough to putdst
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;=============
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; putdst
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;=============
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; store A into destination
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putdst:
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sta (LZ4_DST), Y ; store A into destination
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inc LZ4_DST ; increment 16-bit pointer
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bne putdst_end ; if overflow, increment top byte
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inc LZ4_DST+1
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putdst_end:
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rts
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;=============================
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; docopy
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;=============================
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; copies ram[count+1]-1:X bytes
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; from src to dst
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docopy:
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docopy_loop:
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jsr getput ; get/put byte
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dex ; decrement count
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bne docopy_loop ; if not zero, loop
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dec COUNT+1 ; if zero, decrement high byte
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bne docopy_loop ; if not zero, loop
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rts
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@ -2,7 +2,7 @@
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; by deater (Vince Weaver) <vince@deater.net>
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.include "zp.inc"
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.include "hardware.inc"
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@ -16,6 +16,24 @@
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bit HIRES ; hires mode !!!
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bit SET_GR ; graphics mode
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lda #<c64
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sta LZ4_SRC
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lda #>c64
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sta LZ4_SRC+1
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lda #<c64_end
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sta LZ4_END
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lda #>c64_end
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sta LZ4_END+1
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lda #<$2000
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sta LZ4_DST
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lda #>$2000
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sta LZ4_DST+1
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jsr lz4_decode
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;===================
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; do nothing
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@ -24,6 +42,12 @@ do_nothing:
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jmp do_nothing
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.align $1000
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.include "lz4_decode.s"
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.incbin "c64.img"
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;===================
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; graphics
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;===================
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c64:
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.incbin "c64.img.lz4",11
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c64_end:
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142
megademo/zp.inc
Normal file
142
megademo/zp.inc
Normal file
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@ -0,0 +1,142 @@
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;; LZ4 addresses
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LZ4_SRC = $00
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LZ4_DST = $02
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LZ4_END = $04
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COUNT = $06
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DELTA = $08
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;; Zero page monitor routines addresses
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WNDLFT = $20
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WNDWDTH = $21
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WNDTOP = $22
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WNDBTM = $23
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CH = $24
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CV = $25
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GBASL = $26
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GBASH = $27
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BASL = $28
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BASH = $29
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H2 = $2C
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V2 = $2D
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MASK = $2E
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COLOR = $30
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;INVFLG = $32
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; dos33 zero page = 26-2f, 35-38, 3e 3f 40-4d
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; overlap applesoft 67-6a,6f,70,af,b0,ca-cd,d8
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; DOS33: Confirmed kills $68
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RWTSL = $60
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RWTSH = $61
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DOSBUFL = $62
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DOSBUFH = $63
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FILEML = $64
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FILEMH = $65
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;FACTOR_I = $66
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;FACTOR_F = $67
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;DX_I = $68
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;DX_F = $69
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;SPACEX_I = $6A
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;SPACEX_F = $6B
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;CX_I = $6C
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;CX_F = $6D
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;DY_I = $6E
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;DY_F = $6F
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REGISTER_DUMP = $70
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A_FINE_TONE = $70
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A_COARSE_TONE = $71
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B_FINE_TONE = $72
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B_COARSE_TONE = $73
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C_FINE_TONE = $74
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C_COARSE_TONE = $75
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NOISE = $76
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ENABLE = $77
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A_VOLUME = $78
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B_VOLUME = $79
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C_VOLUME = $7A
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ENVELOPE_FINE = $7B
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ENVELOPE_COARSE = $7C
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ENVELOPE_SHAPE = $7D
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COPY_OFFSET = $7E
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DECODER_STATE = $7F
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REGISTER_DUMP2 = $80
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A_FINE_TONE2 = $80
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A_COARSE_TONE2 = $81
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B_FINE_TONE2 = $82
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B_COARSE_TONE2 = $83
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C_FINE_TONE2 = $84
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C_COARSE_TONE2 = $85
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NOISE2 = $86
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ENABLE2 = $87
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A_VOLUME2 = $88
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B_VOLUME2 = $89
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C_VOLUME2 = $8A
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ENVELOPE_FINE2 = $8B
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ENVELOPE_COARS2 = $8C
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ENVELOPE_SHAPE2 = $8D
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LYRICSL = $8E
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LYRICSH = $8F
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FRAME_COUNT = $90
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MB_VALUE = $91
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MB_ADDRL = $91
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MB_ADDRH = $92
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DONE_PLAYING = $93
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MB_CHUNK_OFFSET = $94
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CHUNKSIZE = $95
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LZ4_DONE = $96
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DECODE_ERROR = $97
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COPY_TIME = $98
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DECOMPRESS_TIME = $99
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TIME_TAKEN = $9A
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LYRICS_ACTIVE = $9B
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;FORTYCOL = $9C
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CURSOR = $9D
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; More zero-page addresses
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; we try not to conflict with anything DOS, MONITOR or BASIC related
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;COLOR1 = $E0
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;COLOR2 = $E1
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;MATCH = $E2
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;XX = $E3
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YY = $E4
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;SHIPY = $E4
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;YADD = $E5
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;LOOP = $E6
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;MEMPTRL = $E7
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;MEMPTRH = $E8
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;NAMEL = $E9
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;NAMEH = $EA
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;NAMEX = $EB
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;CHAR = $EC
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DISP_PAGE = $ED
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DRAW_PAGE = $EE
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;FIRST = $F0
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;LASTKEY = $F1
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;PADDLE_STATUS = $F2
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SPRITETEMP = $F2
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XPOS = $F3
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YPOS = $F4
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TEMP = $FA
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TEMPY = $FB
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INL = $FC
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INH = $FD
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OUTL = $FE
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OUTH = $FF
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