games: riven: not really, just to get some images for my slides
This commit is contained in:
Vince Weaver
parent
c634f10f9c
commit
1262cde56f
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@ -0,0 +1,58 @@
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#include ../Makefile.inc
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#include ../../../Makefile.inc
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DOS33 = ../../utils/dos33fs-utils/dos33
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DOS33_RAW = ../../utils/dos33fs-utils/dos33_raw
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TOKENIZE = ../../utils/asoft_basic-utils/tokenize_asoft
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LINKER_SCRIPTS = ../../linker_scripts
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EMPTY_DISK = ../../empty_disk
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B2D = ../../utils/bmp2dhr/b2d
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PNG2GR = ../../utils/gr-utils/png2gr
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LZSA = ~/research/lzsa/lzsa/lzsa
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###
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all: riven.dsk
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riven.dsk: HELLO RIVEN
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cp $(EMPTY_DISK)/empty.dsk riven.dsk
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$(DOS33) -y riven.dsk SAVE A HELLO
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$(DOS33) -y riven.dsk BSAVE -a 0x6000 RIVEN
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###
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HELLO: hello.bas
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$(TOKENIZE) < hello.bas > HELLO
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###
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RIVEN: riven.o
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ld65 -o RIVEN riven.o -C $(LINKER_SCRIPTS)/apple2_6000.inc
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riven.o: riven.s riven_title.lzsa riven1.lzsa riven3.lzsa
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ca65 -o riven.o riven.s -l riven.lst
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riven_title.lzsa: RIVEN_TITLEC.BIN
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$(LZSA) -r -f2 RIVEN_TITLEC.BIN riven_title.lzsa
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RIVEN_TITLEC.BIN: riven_title.bmp
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$(B2D) riven_title.bmp HGR -d
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####
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%.gr: %.png
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$(PNG2GR) $< $@
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%.lzsa: %.gr
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$(LZSA) -r -f2 $< $@
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###
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clean:
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rm -f *~ *.o *.lst HELLO RIVEN
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@ -0,0 +1,370 @@
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; note -- modified by Vince Weaver to assemble with ca65
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; in this case, A = page to decompress to
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; getsrc_smc+1, getsrc_smc+2 is src location
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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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getsrc_smc:
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LZSA_SRC_LO = *+1
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LZSA_SRC_HI = *+2
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lda $AAAA
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inc getsrc+1
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beq getsrc_adj_hi
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rts
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getsrc_adj_hi:
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inc getsrc+2
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rts
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.endif
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@ -0,0 +1,3 @@
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5 HOME
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20 PRINT CHR$(4)"CATALOG"
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@ -0,0 +1,79 @@
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; Riven fake out
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NIBCOUNT = $09
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KEYPRESS = $C000
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KEYRESET = $C010
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PAGE0 = $C054
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LORES = $C056
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HGR2 = $F3D8
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hgr_display:
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jsr HGR2 ; Hi-res graphics, no text at bottom
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; Y=0, A=0 after this called
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bit PAGE0
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lda #<(riven_title_lzsa)
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sta getsrc_smc+1
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lda #>(riven_title_lzsa)
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sta getsrc_smc+2
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lda #$20
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jsr decompress_lzsa2_fast
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jsr wait_until_keypress
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;===========================
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bit LORES
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lda #<(riven1_lzsa)
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sta getsrc_smc+1
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lda #>(riven1_lzsa)
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sta getsrc_smc+2
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lda #$04
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jsr decompress_lzsa2_fast
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jsr wait_until_keypress
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;===========================
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bit LORES
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lda #<(riven3_lzsa)
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sta getsrc_smc+1
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lda #>(riven3_lzsa)
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sta getsrc_smc+2
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lda #$04
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jsr decompress_lzsa2_fast
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jsr wait_until_keypress
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forever:
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jmp forever
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.include "wait_keypress.s"
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.include "decompress_fast_v2.s"
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riven_title_lzsa:
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.incbin "riven_title.lzsa"
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riven1_lzsa:
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.incbin "riven1.lzsa"
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riven3_lzsa:
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.incbin "riven3.lzsa"
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Binary file not shown.
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After Width: | Height: | Size: 17 KiB |
Binary file not shown.
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After Width: | Height: | Size: 14 KiB |
Binary file not shown.
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@ -0,0 +1,5 @@
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wait_until_keypress:
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lda KEYPRESS ; 4
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bpl wait_until_keypress ; 3
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bit KEYRESET ; clear the keyboard buffer
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rts ; 6
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