1087 lines
19 KiB
NASM
Executable File
1087 lines
19 KiB
NASM
Executable File
**************************************************************
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*
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* Software: Warren Davis
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* Initiated: 9/3/91
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*
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* Modified: Shawn Liptak, 8/13/92 -Basketball
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*
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* COPYRIGHT (C) 1992 WILLIAMS ELECTRONICS GAMES, INC.
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*
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*.Last mod - 3/24/93 11:23
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**************************************************************
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.file "unzip.asm"
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.title "pkzip unzipper"
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.width 132
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.option b,d,l,t
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.mnolist
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.include "mproc.equ" ;Mproc equates
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.include "disp.equ" ;Display proc equates
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.include "gsp.equ" ;Gsp asm equates
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.include "sys.equ"
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.include "imgtbl.glo"
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.include "shawn.hdr" ;Macros
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.include "frame.tbl"
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.ref pal_getf
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; .ref pal_clean
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.ref SYSCOPY
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.ref last_score,scores,tvpanelon
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.ref get_all_buttons_cur
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BPP .set 3
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RAMBUFSIZ .set (4*1024)*8 ; << BPP
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;SCRN_ST .set (170*SCRN_PTCH)+(150*8)
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;PXLS_PR_TIK .set 10000
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PAGE1ADR .equ PAGE1YO*512*8
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CARYTEST .equ 0 ;1 for Cary's board testing
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ERRORTEST .equ 0 ;1 for random pixel test
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DEBUGPORT .equ >1d01010
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STRUCTPD
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LONG PTEMP1
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LONG PIXPERFRM
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; WORD FRAMENUM
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; LONG CLIPSND
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; WORD HOLDFADE ;Time to hold first frame
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; WORD DEBUGCNT ;For TUNIT debugging
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RamBuffer .usect "unzip",RAMBUFSIZ
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BSSX lengthtree ,256*32
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.bss disttree ,256*32
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.bss minptrtbl ,256*32
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.text
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********************************
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* Show movies (test) (Process)
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; SUBR movie_test
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;
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; calla pal_clean
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;
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; movi 5*60,a1 ;Delay tv score panel
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; move @tvpanelon,a0,L
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; move a1,*a0(PTIME)
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;
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; movi [9,0],a9
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; movi [>8c,0],a10
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; movi (24+83*512)*8,a11 ;XY
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;
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; move @last_score,a0,L
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; cmpi scores,a0
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; jrz #tm1
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;
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; movi [9+216,0],a9
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; movi [>8c,0],a10
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; movi >53780,a11 ;XY
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;
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;#tm1 callr show_edging ;Turn on clip borders
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;
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; SLEEPK 10
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;
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; movi GRANT_F,a8
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; clr a9
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;
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; move a11,a10
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; JSRP movie_run
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;
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; movi >2001,a0
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; calla obj_del1c
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;
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; movk 10,a1 ;Delay tv score panel
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; move @tvpanelon,a0,L
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; move a1,*a0(PTIME)
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;
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; DIE
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;********************************
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;
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; SUBRP show_edging
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;
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; move a9,a0
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; move a10,a1
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;
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; movi livet,a2
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; movi 19989,a3 ;z pos - Below buyin box
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; movi DMAWNZ|M_NOCOLL|M_SCRNREL,a4
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; movi >2001,a5
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; clr a6
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; clr a7
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; calla BEGINOBJ2
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;
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; move a9,a0
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; move a10,a1
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; movi liveb,a2
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; calla BEGINOBJ2
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;
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; move a9,a0
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; move a10,a1
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; movi livel,a2
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; calla BEGINOBJ2
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;
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; move a9,a0
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; move a10,a1
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; movi liver,a2
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; calla BEGINOBJ2
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;
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; rets
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;
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;
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#*******************************
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* Stop for error (DEBUG)
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.if TUNITDB
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SUBRP movie_error
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PUSH a0,a1
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pushst
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dint
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move @SYSCOPY,a0
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ori 4,a0
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move a0,@SYSCOPY
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move a0,@SYSCTRL
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#lp2 movi 20000,a1
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#lp move a0,@ERASELOC
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addk 1,a0
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dsj a1,#lp
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move @SWITCH+16,a1
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not a1
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andi >624,a1
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jrz #lp2
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move @SYSCOPY,a0
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xori 4,a0
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move a0,@SYSCOPY
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move a0,@SYSCTRL
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popst
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PULL a0,a1
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rets
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.endif
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#*******************************
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* Show movies in attract mode
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; SUBR movie_demo
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;
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; calla pal_clean
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;
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; movi GRANT_F,a8
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; clr a9
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; movi (100+50*512)*8,a10 ;XY
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; JSRP movie_run
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;
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; movi PIPPEN_F,a8
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; clr a9
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;; movi (140+70*512)*8,a10 ;XY
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; movi (100+70*512)*8,a10 ;XY
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; JSRP movie_run
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;
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;; movi GRANT_F,a8
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;; movk 1,a9
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;; movi (100+50*512)*8,a10 ;XY
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;; JSRP movie_run
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;;
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;; movi PIPPEN_F,a8
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;; movk 1,a9
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;; movi (140+70*512)*8,a10 ;XY
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;; JSRP movie_run
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;
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;#x RETP
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#*******************************
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* Run movie footage (JSRP)
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* A8=* compressed picture data
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* A9=Mode (0=Normal, 1=x2)
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* A10=Screen * for top left of picture
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* Trashes scratch, A2-A11,B2-B10
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SUBR movie_run
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;DEBUG
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; jauc 0
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addi SCRNXP*8,a10 ;+XPad offset
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move @dpage,a14
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jrnz #p2
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addi PAGE1YO*512*8,a10 ;Start in page 1 if page 0 is being displayed
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#p2
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callr movie_waitdma
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.if CARYTEST
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movk 1,a14
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move a14,@DEBUGPORT
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.endif
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callr movie_parsehdr
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jrnz #error
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move b3,a14 ;Height
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subk 1,a14
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movi SCRN_PTCH,a1
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mpys a14,a1
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add a1,a10 ;* to bottom left
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callr movie_getpal
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jrz #error
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;A4=# frames
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;A6=X size
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;B3=Y size
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;B4=strtpal
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movi blowline,b10
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move a9,a9
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jrz #mode0
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movi blowlinex2,b10
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#mode0
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JSRP movie_unzip
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#x setf 16,1,0
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setf 32,0,1
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RETP
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#error
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clr a14
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move a14,@DEBUGPORT
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LOCKUP
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jruc #x
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#*******************************
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* Wait for DMA activity to stop
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* Trashes A14
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SUBRP movie_waitdma
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#wtlp
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move b13,b13 ;Wait for DMAQ empty
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jrge #wtlp
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move @DMACTRL,a14
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jrn #wtlp
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.if CARYTEST=0
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movk 1,a14
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move a14,@DEBUGPORT
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#dly movi 200,a14 ;Wait 400 cycles
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dsj a14,$
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move @DMACTRL,a14
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jrnn #x
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LOCKUP
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jruc #dly
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.endif
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#x rets
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#*******************************
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* Get a movie palette
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* A7=# of colors
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* A8=* to color data
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* >A0=Color map allocated (0000-cfcf)
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* Z set if no palette free
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* Trashes scratch
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SUBRP movie_getpal
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move a8,a0
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subk 16,a0 ;Point to # colors
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calla pal_getf
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jrz #x
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move a7,a1
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sll 4,a1 ;*16
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add a1,a8
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move a0,b4
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addk 1,a1 ;Clr Z
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#x rets
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#*******************************
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* Get movie info
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* A8=* to compressed data
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*Rets:
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* >A0=!0 if error (CC)
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* >A4=# frames
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* >A6/B9=X
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* >A7=# colors in palette
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* >B3=Y
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* Trashes scratch
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movie_parsehdr
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move a8,a14
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movk 30,a0 ;# retries
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#rd move *a8+,a6 ;X size of frames
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move *a8+,a1 ;Y size of frames
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move *a8+,a4 ;# of frames
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move *a8+,a7 ;# of colors
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move a1,b3
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move a6,b9
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cmpi 100,a6 ;X
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jrne #error
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cmpi 68,b3 ;Y
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jrne #error
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cmpi 5,a4 ;#frms
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jrlt #error
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cmpi 35,a4
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jrgt #error
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cmpi 200,a7 ;#colors
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jrlt #error
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cmpi 255,a7
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jrhi #error
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clr a0
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rets
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#error
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movk 101b,a8
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move a8,@DEBUGPORT
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move a14,a8
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dsj a0,#rd
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addk 1,a0
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rets
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********************************
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* GSP Decompression routine
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*
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* ASSUMPTIONS: 1) There is no literal table
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* 2) the size of the sliding window is 4K
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*
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* Needs the following Data Tables:
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* CompressedDataTable will contain the following once
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* it is uncompressed:
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* # frames (1 byte)
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* # colors in palette (1 byte)
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* X size of frame (1 byte)
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* Y Size of frame (1 byte)
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* variable length palette data
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* data for each frame
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*
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* Needs the following RAM variables:
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* LengthTree 256 long words
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* DistanceTree 256 long words
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* MinPtrTable 256 long words (used for sort)
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* RamBuffer circular buffer
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* Tree layout is as follows...
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* low 16 bits = Code
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* next 8 bits = Bit length
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*
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* B reg usage...
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* B0 = Ptr to Length tree
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* B1 = Ptr to Distance tree
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* B3 = start of line
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* B4 = start palette duped to fill 16 bits
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* B5 = used for outputting pal bits to DMAPAL
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* B6 = temp storage in ReadTree and UncompressTree
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* B7 = constant mask for pxl palette split
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* B8 = DMAPAL
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* B9 = Master X storage
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#*******************************
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* Uncompress a tree
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* A7=* to tree table
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* A8=* to compressed data
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* >A0=!0 if error (CC)
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UncompressTree:
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PUSH a4,a5
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move a7,a5 ;Save start of tree
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clr a4
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PUSH a8
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;>Determine how many codes of each bit length
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setf 8,0,0
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move *a8+,a0 ;# compressed bytes to describe tree - 1
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addk 1,a0
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movk >f,a3 ;Constant
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clr a6 ;Total number of codes in tree
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utr0
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move *a8+,a1 ;(# codes - 1 << 4) | bit lngth - 1
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add a1,a4 ;Chksum
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move a1,a2
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srl 4,a2
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addk 1,a2 ;number of codes of this bit length
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add a2,a6 ;adjust total
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and a3,a1
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addk 1,a1 ;bit length
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move a1,a11
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sll 16,a11
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movy a11,a1 ;duplicate bit length for sort
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utr1
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move a1,*a7+,L
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dsj a2,utr1 ;fill table
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dsj a0,utr0 ;a6 now contains size of tree
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PULL a8 ;>Recalc chksum
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clr a2
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move *a8+,a0 ;# compressed bytes to describe tree - 1
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addk 1,a0
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#chklp move *a8+,a1
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add a1,a2
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dsj a0,#chklp
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setf 16,1,0
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cmp a2,a4
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jrne #error ;Chksums don't match?
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* Sort Tree by increasing Bit Length.
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* The translation index is placed in the upper byte
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* of the long word.
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movi minptrtbl,a0 ; for placing translation ptrs
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move a6,a9 ; outer loop count (# entries in tree table)
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* Outer loop, after each pass, we have found the next minimum
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utr2
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move a5,a7 ; restore start of tree
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movi 06543h,a14 ; current minimum
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move a6,b6 ; inner loop count
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movi 07654h,a1 ; constant
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* Inner loop, go through all values in table and find min.
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* When we find it, we set it to a high value so we don't detect
|
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* it again.
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|
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utr3
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move *a7,a2 ; look at next bit length
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cmp a14,a2 ; is it less than the last minimum
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jrge nonewmin
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move a2,a14 ; if yes, save new minimum
|
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move a7,a11 ; save pointer to minimum
|
||
nonewmin
|
||
addk 32,a7 ; point to next entry
|
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dsj b6,utr3
|
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|
||
; end of inner loop: min is in a14, ptr to min is in a7
|
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|
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move a1,*a11 ; set this minimum high.
|
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move a11,*a0+,L ; place translation ptr in MinPtrTbl.
|
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|
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dsjs a9,utr2
|
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|
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;>Compute the codes
|
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clr a11 ;Code
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clr a1 ;CodeInc
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clr a2 ;LastBitLength
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move a6,a14 ;loop counter
|
||
utr4
|
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move *-a0,a7,L ;translated pointer
|
||
add a1,a11
|
||
movb *a7(16),a3 ;bit length
|
||
cmp a3,a2
|
||
jreq samebitlng
|
||
move a3,a2 ;set new LastBitLength
|
||
movk 16,a3
|
||
sub a2,a3 ;16-LastBitLength
|
||
movk 1,a1
|
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sll a3,a1 ;CodeInc = 1 << (16-LastBitLength)
|
||
samebitlng
|
||
move a11,a5 ;copy of Code in a5
|
||
movk 16,a9 ;reverse bit loop count
|
||
rvrsbts
|
||
sll 1,a5 ;Reverse bits of word
|
||
movy a5,a3
|
||
srl 1,a3
|
||
zext a5
|
||
dsjs a9,rvrsbts
|
||
|
||
move a3,*a7 ;store code with bits reversed
|
||
dsjs a14,utr4
|
||
|
||
clr a0
|
||
|
||
#x PULL a4,a5
|
||
move a0,a0
|
||
rets
|
||
|
||
|
||
#error
|
||
movk 1001b,a14
|
||
move a14,@DEBUGPORT
|
||
|
||
LOCKUP
|
||
movk 1,a0 ;Error!
|
||
jruc #x
|
||
|
||
|
||
|
||
********************************
|
||
|
||
SetConstants:
|
||
movi lengthtree,b0
|
||
movi disttree,b1
|
||
SetConstX
|
||
movi RamBuffer+RAMBUFSIZ-1,a0 ;mask for rambuf ptr
|
||
movi RamBuffer,a6 ;used for negative wraparound
|
||
movi 0c0c0h,b7 ;for blowing words of
|
||
movi DMACMAP,b8
|
||
; movi blowline,b10
|
||
rets
|
||
|
||
|
||
|
||
#*******************************
|
||
* Initialize and run unzip loop (JSRP)
|
||
* A4=# of frames
|
||
* A8=* compressed data table
|
||
* A10=Screen * for top left of picture
|
||
* B3=Y size
|
||
* B4=strt pal
|
||
* B9=X size
|
||
|
||
SUBRP movie_unzip
|
||
|
||
|
||
.if TUNITDB
|
||
jruc #debugstrt
|
||
.endif
|
||
|
||
|
||
movi lengthtree,b0
|
||
movi disttree,b1
|
||
|
||
movk 10,a5
|
||
#ltlp move b0,a7 ;Length Tree
|
||
move a8,b2
|
||
callr UncompressTree
|
||
jrz #ltok ;OK?
|
||
move b2,a8
|
||
dsj a5,#ltlp
|
||
jruc #error
|
||
#ltok
|
||
|
||
movk 10,a5
|
||
#dtlp move b1,a7 ;Distance Tree
|
||
move a8,b2
|
||
callr UncompressTree
|
||
jrz #dtok ;OK?
|
||
move b2,a8
|
||
dsj a5,#dtlp
|
||
jruc #error
|
||
#dtok
|
||
|
||
.if CARYTEST
|
||
clr a14
|
||
move a14,@DEBUGPORT
|
||
.endif
|
||
|
||
#debugstrt
|
||
|
||
;Clear top 4K of buffer to take care of initial wraparound
|
||
|
||
movi RamBuffer+RAMBUFSIZ,a1 ;End of buffer
|
||
movi 1024,a2 ;4K
|
||
clr a3
|
||
clrbuf
|
||
move a3,*-a1,L
|
||
dsj a2,clrbuf
|
||
|
||
;Do some initializing
|
||
mpyu b9,b3
|
||
move b3,a11 ;total # bytes in frame in a11
|
||
move a11,*a13(PIXPERFRM),L
|
||
callr SetConstX
|
||
move a6,a9 ;Where to uncompress to
|
||
move a9,b3 ;first frame start
|
||
clr b5 ;pixel count for Stills only
|
||
|
||
cmpi 1,a4
|
||
jreq UncompressFrame ;1 frame?
|
||
|
||
;----
|
||
|
||
#lp
|
||
mmtm a12,a4,a10
|
||
|
||
callr movie_waitdma
|
||
|
||
.if CARYTEST
|
||
movk 10b,a14
|
||
move a14,@DEBUGPORT
|
||
.endif
|
||
|
||
.if TUNITDB
|
||
movi 50,a0
|
||
#dblp
|
||
movi 80,a2
|
||
#dblp2
|
||
move a8,a9
|
||
addi GRANT_F2-GRANT_F,a9
|
||
movb *a8,a14
|
||
movb *a9,a1
|
||
move a14,@SCRATCH+13
|
||
move a1,@SCRATCH+16+15
|
||
cmp a1,a14
|
||
jreq #cmpok
|
||
#dberr callr movie_error
|
||
mmfm a12,a4,a10
|
||
RETP
|
||
#cmpok
|
||
move @DMACTRL,a1
|
||
move @DMACTRL,a1
|
||
move @DMACTRL,a1
|
||
move @SWITCH,a1,L
|
||
move @SWITCH,a1,L
|
||
move @SWITCH,a1,L
|
||
movb *a9,a1
|
||
cmp a1,a14
|
||
jrne #dberr
|
||
move @SCRATCH+13,a1
|
||
cmp a1,a14
|
||
jrne #dberr
|
||
movb *a8,a14
|
||
move @SCRATCH+16+15,a1
|
||
cmp a1,a14
|
||
jrne #dberr
|
||
|
||
movb a14,*a10
|
||
addk 8,a8
|
||
addk 8,a9
|
||
addk 8,a10
|
||
dsj a2,#dblp2
|
||
addi (512-80)*8,a10
|
||
dsj a0,#dblp
|
||
|
||
jruc #skipuncomp
|
||
.endif
|
||
|
||
|
||
JSRP UncompressFrame
|
||
|
||
clr a0
|
||
move a0,@DEBUGPORT
|
||
#skipuncomp
|
||
|
||
movk 1,a0 ;1 tick sleep
|
||
; move *a13(FRAMENUM),a14 ;if 1st frame, check for hold
|
||
; jrz chk4hold
|
||
; subk 1,a14
|
||
; jrne nonono
|
||
;
|
||
; move *a13(HOLDFADE),a14 ;on second frame, wait for hold time
|
||
; add a14,a0
|
||
; jruc nonono
|
||
;
|
||
;chk4hold
|
||
; move *a13(HOLDFADE),a14
|
||
; jrz nonono ; if need to hold, create fade process
|
||
; PUSH a8
|
||
; move b4,a8
|
||
;; CREATE0 HOLD_FADE_PROC
|
||
; PULL a8
|
||
; movk 6,a0 ; sleep longer if we are fading pal
|
||
;nonono
|
||
|
||
|
||
movi swappg,a14
|
||
jruc GoToSleep
|
||
|
||
|
||
swappg
|
||
|
||
mmfm a12,a4,a10
|
||
|
||
xori PAGE1YO*512*8,a10 ;Flip * to other page
|
||
|
||
; PUSH a0
|
||
|
||
setf 16,1,0
|
||
|
||
|
||
; move *a13(FRAMENUM),a14 ;sound only on first frame
|
||
; jrnz no
|
||
; move *a13(CLIPSND),a0,L ;sound from sound table
|
||
; jrz no
|
||
; PUSH a14
|
||
; calla snd_play1
|
||
; PULL a14
|
||
;no
|
||
; PULL a0
|
||
;
|
||
; addk 1,a14
|
||
; move a14,*a13(FRAMENUM) ;save next frame number
|
||
|
||
move *a13(PIXPERFRM),a14,L ;number of pixels in a frame
|
||
add a14,a11 ;adjust by extra pixels done last time
|
||
|
||
; cmpi 2,a4
|
||
; jrne #nxtf
|
||
; movi blowlinelastfrm,b10
|
||
|
||
#nxtf
|
||
PUSH a0,a1,a2
|
||
calla get_all_buttons_cur
|
||
PULL a0,a1,a2
|
||
jrnz #abort
|
||
|
||
|
||
dsj a4,#lp ;Loop once for each frame
|
||
|
||
#abort
|
||
callr movie_waitdma
|
||
;>Copy visable frame to other page
|
||
move *a13(PIXPERFRM),a14,L ;# of pixels in a frame
|
||
|
||
move b4,*b8 ;Set pallette
|
||
|
||
move a10,a2 ;* screen
|
||
xori PAGE1YO*512*8,a2 ;Flip * to other page
|
||
#cpylp
|
||
move a2,a0
|
||
move a10,a1
|
||
|
||
move b9,a5 ;X size
|
||
srl 1,a5 ;X/2 = loop counter
|
||
#cllp move *a0+,*a1+
|
||
dsj a5,#cllp
|
||
|
||
subi SCRN_PTCH,a2
|
||
subi SCRN_PTCH,a10
|
||
move b9,a0
|
||
sub a0,a14
|
||
jrgt #cpylp ;More pixels?
|
||
|
||
|
||
#x
|
||
RETP
|
||
|
||
|
||
#error LOCKUP
|
||
jruc #x
|
||
|
||
|
||
********************************
|
||
|
||
|
||
GoToSleep
|
||
getst b2
|
||
move a12,b6
|
||
mmtm b6,b2,b3,b4,b5,b9,b10
|
||
move b6,a12
|
||
|
||
setf 16,1,0
|
||
setf 32,0,1
|
||
move a14,*a13(PTEMP1),L
|
||
calla PRCSLP
|
||
|
||
move a12,b6
|
||
mmfm b6,b2,b3,b4,b5,b9,b10
|
||
move b6,a12
|
||
|
||
callr SetConstants
|
||
move *a13(PTEMP1),a14,L
|
||
|
||
putst b2
|
||
exgpc a14 ;Return
|
||
|
||
|
||
|
||
********************************
|
||
* Uncompress a single frame
|
||
* A0=Address mask for circular buffer
|
||
* A8=* to compressed data
|
||
* A9=* to buffer for uncompressed bytes
|
||
* A11=How many to place before returning
|
||
* B0=*Length tree
|
||
* B1=*Distance tree
|
||
*
|
||
*Trashes:
|
||
* a1 = Distance
|
||
* a2 = ptr to leftover data if there is any
|
||
* a4 = Length
|
||
*
|
||
* ReadTree uses A2-A5,A7,A14,B6
|
||
* Need to Preserve: B9-B10
|
||
|
||
UncompressFrame:
|
||
|
||
setf 16,0,1 ;Field 1 = 16 bits no sign-ext
|
||
move b4,*b8,1 ;Set pallette
|
||
|
||
UncFr0
|
||
setf 1,0,0
|
||
move *a8+,a14 ; if bit = 1, read 8 bits and copy
|
||
.if ERRORTEST
|
||
move @HCOUNT,a14
|
||
.endif
|
||
jrz decode_still
|
||
setf 8,0,0
|
||
|
||
move *a8+,*a9+
|
||
and a0,a9
|
||
|
||
addk 1,b5 ; pixel count
|
||
subk 1,a11
|
||
us1
|
||
cmp b5,b9 ; have we filled a line yet?
|
||
jrgt us0
|
||
|
||
call b10 ; Blow Line Routine
|
||
|
||
us0
|
||
move a11,a11
|
||
jrgt UncFr0
|
||
|
||
setf 16,1,0
|
||
setf 32,0,1
|
||
RETP
|
||
|
||
|
||
decode_still: ; if bit = 0, decode from trees
|
||
setf 6,0,0
|
||
move *a8+,a1 ; lower 6 bits of distance
|
||
|
||
.if ERRORTEST
|
||
move @HCOUNT,a1
|
||
.endif
|
||
|
||
move b1,a5 ; Distance Tree in a5
|
||
callr ReadTree ; Result in a7
|
||
sll 6,a7
|
||
or a7,a1
|
||
inc a1 ; DISTANCE in a1
|
||
sll BPP,a1 ; turn it into a pointer
|
||
|
||
move b0,a5 ; Length Tree in a5
|
||
callr ReadTree ; Result in a7
|
||
|
||
setf 8,0,0
|
||
|
||
cmpi 63,a7
|
||
jrne notmaxs
|
||
move *a8+,a3 ; If length is 63, get next byte, and
|
||
|
||
.if ERRORTEST
|
||
move @HCOUNT,a3
|
||
.endif
|
||
|
||
add a3,a7 ; add it to the length
|
||
notmaxs
|
||
addk 2,a7 ; add MML, LENGTH in a7
|
||
|
||
; We now have Length and Distance, now determine where to copy from
|
||
|
||
move a9,a2 ; copy of current position in a2
|
||
sub a1,a2 ; initial attempt
|
||
and a0,a2 ; handle wraparound
|
||
or a6,a2 ;copy pointer is now in a2
|
||
|
||
sub a7,a11 ;Adjust total pixel count
|
||
move a7,b6
|
||
add b6,b5 ;Adjust pixel counter for this line
|
||
|
||
copys
|
||
move *a2+,*a9+ ;>Copy
|
||
and a0,a2
|
||
and a0,a9
|
||
dsj a7,copys
|
||
|
||
jruc us1
|
||
|
||
|
||
#*******************************
|
||
* Read compression tree
|
||
* A5=*Tree table
|
||
* A8=*Compressed data
|
||
* Field 1 = 16 bits
|
||
* >A7=Data
|
||
*
|
||
* Trashes: A2-A5,A14,B6
|
||
*
|
||
* Must preserve: A0,A1,A6,A8-A11
|
||
|
||
ReadTree:
|
||
movk 1,a2 ; bits_read
|
||
setf 1,0,0
|
||
move *a8+,a7 ; read a bit
|
||
rl 31,a7 ; rotate right one more bit
|
||
clr b6 ; result
|
||
jruc #strt
|
||
#lp
|
||
addk 1,b6
|
||
#strt move *a5+,a3,1 ; Code in a3
|
||
move *a5+,a4,1 ; Blngth in a4
|
||
movk 32,a14
|
||
sub a2,a14
|
||
rl a14,a3 ; rotate right as many bits have been read
|
||
#lp2
|
||
cmpxy a3,a7
|
||
jrynz #lp
|
||
|
||
cmp a2,a4
|
||
jreq #x
|
||
move *a8+,a14 ; read a bit
|
||
or a14,a7 ; accumulate with other bits
|
||
inc a2 ; inc bits_read
|
||
rl 31,a7 ; rotate right one more bit
|
||
rl 31,a3 ; shift code for check of next bit
|
||
jruc #lp2
|
||
|
||
#x
|
||
move b6,a7
|
||
rets ;Result returned in a7
|
||
|
||
|
||
|
||
#*******************************
|
||
* BlowLine is used during decompression of a Still Picture to blow out
|
||
* a single line of data. Since only a single line needs to be stored at
|
||
* once, the RamBuffer can be as small as 4K.
|
||
* A0=Address mask for circular buffer
|
||
* Field 1 = 16 bits
|
||
* Trashes A1-A2,A5
|
||
|
||
SUBRP blowline
|
||
|
||
; setf 32,0,0
|
||
|
||
move a10,a2 ;* screen
|
||
|
||
move b3,a1 ;Start of line
|
||
move b9,a5 ;X size
|
||
srl 2,a5 ;X/4 = loop counter
|
||
jrnc #by4
|
||
move *a1+,*a2+,1 ;Copy 2 pixels
|
||
and a0,a1
|
||
#by4
|
||
#lp
|
||
move *a1+,*a2+,1 ;Copy 2 pixels
|
||
and a0,a1
|
||
move *a1+,*a2+,1 ;Copy 2 pixels
|
||
and a0,a1
|
||
dsj a5,#lp
|
||
|
||
|
||
endblowline
|
||
subi SCRN_PTCH,a10
|
||
move a1,b3 ;save for next frame
|
||
sub b9,b5 ;readjust pixels for next line
|
||
cmp b9,b5 ;added 6/92. if there are enough pixels
|
||
jrge #nuther ;left to do another line, do it.
|
||
|
||
rets
|
||
|
||
#nuther
|
||
jruc blowline
|
||
|
||
|
||
|
||
********************************
|
||
* Same as BlowLine, but blows to both screens
|
||
* Trashes A1,A3-A5
|
||
|
||
;blowlinelastfrm
|
||
;
|
||
; move a10,a3 ; where on screen to put
|
||
; move a3,a4
|
||
; xori PAGE1ADR,a4
|
||
; move b3,a1 ; start of line
|
||
; move b9,a5 ; X size
|
||
; srl 1,a5 ; X/2 = loop counter
|
||
;
|
||
;spbl1
|
||
; move *a1+,a14,1 ; write into both screens
|
||
; move a14,*a3+,1
|
||
; move a14,*a4+,1 ; write into both screens
|
||
; and a0,a1
|
||
; dsjs a5,spbl1
|
||
;
|
||
; jruc endblowline
|
||
|
||
|
||
|
||
#*******************************
|
||
* BlowLine is used during decompression of a Still Picture to blow out
|
||
* a single line of data. Since only a single line needs to be stored at
|
||
* once, the RamBuffer can be as small as 4K.
|
||
* A0=Address mask for circular buffer
|
||
* Field 1 = 16 bits
|
||
|
||
SUBRP blowlinex2
|
||
|
||
|
||
move a10,a2 ;* screen
|
||
move a10,a3
|
||
addi SCRN_PTCH,a3
|
||
|
||
move b3,a1 ;start of line
|
||
move b9,a5 ;X size
|
||
|
||
setf 8,0,0
|
||
#lp
|
||
move *a1+,a14 ;Get 8 bits
|
||
move a14,a4
|
||
sll 8,a4
|
||
or a4,a14
|
||
move a14,*a2+,1 ;16 bits
|
||
move a14,*a3+,1
|
||
and a0,a1
|
||
dsjs a5,#lp
|
||
|
||
|
||
subi SCRN_PTCH*2,a10
|
||
move a1,b3 ; save for next frame
|
||
sub b9,b5 ; readjust pixels for next line
|
||
cmp b9,b5 ; added 6/92. if there are enough pixels
|
||
jrge #nuther ; left to do another line, do it.
|
||
|
||
rets
|
||
|
||
#nuther
|
||
jruc blowlinex2
|
||
|
||
|
||
|
||
|
||
.end
|
||
|