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Club Amiga de Montreal - CAM
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AmigaBASIC Source Code
|
1988-12-27
|
6KB
|
308 lines
CLEAR ,40000
InitalizeParms:
OPEN "com1:300,N,8,1" AS 1
speak$ = TRANSLATE$ ("Welcome")
SAY (speak$)
Main:
DIM bPlane&(5), cTabWork%(32), cTabSave%(32)
REM - Functions from dos.library
DECLARE FUNCTION xOpen& LIBRARY
DECLARE FUNCTION xRead& LIBRARY
DECLARE FUNCTION xWrite& LIBRARY
REM - xClose returns no value
REM - Functions from exec.library
DECLARE FUNCTION AllocMem&() LIBRARY
REM - FreeMem returns no value
PRINT:PRINT "Looking for bmaps ... ";
LIBRARY "dos.library"
LIBRARY "exec.library"
LIBRARY "graphics.library"
PRINT "found them."
ACBMname$="Title"
IF (ACBMname$ = "") GOTO Mcleanup2
PRINT
REM - Load the ACBM pic
loadError$ = ""
GOSUB LoadACBM
IF loadError$ <> "" THEN GOTO Mcleanup
REM - Demo Graphicraft color cycling
IF foundCCRT AND ccrtDir% THEN
REM - Save colors
FOR kk = 0 TO nColors% -1
cTabSave%(kk) = PEEKW(colorTab&+(kk*2))
cTabWork%(kk) = cTabSave%(kk)
NEXT
REM - Cycle colors
FOR kk = 0 TO 80
IF ccrtDir% = 1 THEN
GOSUB Fcycle
ELSE
GOSUB Bcycle
END IF
CALL LoadRGB4&(sViewPort&,VARPTR(cTabWork%(0)),nColors%)
REM - Delays approximated
FOR de1 = 0 TO ccrtSecs& * 3000
FOR de2 = 0 TO ccrtMics& / 500
NEXT
NEXT
NEXT
REM - Restore colors
CALL LoadRGB4&(sViewPort&,VARPTR(cTabSave%(0)),nColors%)
END IF
Mcleanup:
FOR n = 1 TO 2000
NEXT
Mcleanup2:
LIBRARY CLOSE
IF loadError$ <> "" THEN PRINT loadError$
CHAIN"loader"
END
Bcycle: 'Backward color cycle
cTemp% = cTabWork%(ccrtEnd%)
FOR jj = ccrtEnd%-1 TO ccrtStart% STEP -1
cTabWork%(jj+1) = cTabWork%(jj)
NEXT
cTabWork%(ccrtStart%) = cTemp%
RETURN
Fcycle: 'Forward color cycle
cTemp% = cTabWork%(ccrtStart%)
FOR jj = ccrtStart%+1 TO ccrtEnd%
cTabWork%(jj-1) = cTabWork%(jj)
NEXT
cTabWork%(ccrtEnd%) = cTemp%
RETURN
LoadACBM:
REM - Requires the following variables
REM - to have been initialized:
REM - ACBMname$ (ACBM filespec)
REM - init variables
f$ = ACBMname$
fHandle& = 0
mybuf& = 0
foundBMHD = 0
foundCMAP = 0
foundCAMG = 0
foundCCRT = 0
foundABIT = 0
REM - From include/libraries/dos.h
REM - MODE_NEWFILE = 1006
REM - MODE_OLDFILE = 1005
filename$ = f$ + CHR$(0)
fHandle& = xOpen&(SADD(filename$),1005)
IF fHandle& = 0 THEN
loadError$ = "Can't open/find pic file"
GOTO Lcleanup
END IF
REM - Alloc ram for work buffers
ClearPublic& = 65537
mybufsize& = 360
mybuf& = AllocMem&(mybufsize&,ClearPublic&)
IF mybuf& = 0 THEN
loadError$ = "Can't alloc buffer"
GOTO Lcleanup
END IF
inbuf& = mybuf&
cbuf& = mybuf& + 120
ctab& = mybuf& + 240
REM - Should read FORMnnnnACBM
rLen& = xRead&(fHandle&,inbuf&,12)
tt$ = ""
FOR kk = 8 TO 11
tt% = PEEK(inbuf& + kk)
tt$ = tt$ + CHR$(tt%)
NEXT
IF tt$ <> "ACBM" THEN
loadError$ = "Not an ACBM pic file"
GOTO Lcleanup
END IF
REM - Read ACBM chunks
ChunkLoop:
REM - Get Chunk name/length
rLen& = xRead&(fHandle&,inbuf&,8)
icLen& = PEEKL(inbuf& + 4)
tt$ = ""
FOR kk = 0 TO 3
tt% = PEEK(inbuf& + kk)
tt$ = tt$ + CHR$(tt%)
NEXT
IF tt$ = "BMHD" THEN 'BitMap header
foundBMHD = 1
rLen& = xRead&(fHandle&,inbuf&,icLen&)
iWidth% = PEEKW(inbuf&)
iHeight% = PEEKW(inbuf& + 2)
iDepth% = PEEK(inbuf& + 8)
iCompr% = PEEK(inbuf& + 10)
scrWidth% = PEEKW(inbuf& + 16)
scrHeight% = PEEKW(inbuf& + 18)
iRowBytes% = iWidth% /8
scrRowBytes% = scrWidth% / 8
nColors% = 2^(iDepth%)
REM - Enough free ram to display ?
AvailRam& = FRE(-1)
NeededRam& = ((scrWidth%/8)*scrHeight%*(iDepth%+1))+5000
IF AvailRam& < NeededRam& THEN
loadError$ = "Not enough free ram."
GOTO Lcleanup
END IF
kk = 1
IF scrWidth% > 320 THEN kk = kk + 1
IF scrHeight% > 200 THEN kk = kk + 2
SCREEN 2,scrWidth%,scrHeight%,iDepth%,kk
WINDOW 3,"LoadACBM",,7,2
REM - Get addresses of structures
GOSUB GetScrAddrs
REM - Black out screen
CALL LoadRGB4&(sViewPort&,ctab&,nColors%)
ELSEIF tt$ = "CMAP" THEN 'ColorMap
foundCMAP = 1
rLen& = xRead&(fHandle&,cbuf&,icLen&)
REM - Build Color Table
FOR kk = 0 TO nColors% - 1
red% = PEEK(cbuf&+(kk*3))
gre% = PEEK(cbuf&+(kk*3)+1)
blu% = PEEK(cbuf&+(kk*3)+2)
regTemp% = (red%*16)+(gre%)+(blu%/16)
POKEW(ctab&+(2*kk)),regTemp%
NEXT
ELSEIF tt$ = "CAMG" THEN 'Amiga ViewPort Modes
foundCAMG = 1
rLen& = xRead&(fHandle&,inbuf&,icLen&)
camgModes& = PEEKL(inbuf&)
ELSEIF tt$ = "CCRT" THEN 'Graphicraft color cycle info
foundCCRT = 1
rLen& = xRead&(fHandle&,inbuf&,icLen&)
ccrtDir% = PEEKW(inbuf&)
ccrtStart% = PEEK(inbuf& + 2)
ccrtEnd% = PEEK(inbuf& + 3)
ccrtSecs& = PEEKL(inbuf& + 4)
ccrtMics& = PEEKL(inbuf& + 8)
ELSEIF tt$ = "ABIT" THEN 'Contiguous BitMap
foundABIT = 1
REM - This only handles full size BitMaps, not brushes
REM - Very fast - reads in entire BitPlanes
plSize& = (scrWidth%/8) * scrHeight%
FOR pp = 0 TO iDepth% -1
rLen& = xRead&(fHandle&,bPlane&(pp),plSize&)
NEXT
ELSE
REM - Reading unknown chunk
FOR kk = 1 TO icLen&
rLen& = xRead&(fHandle&,inbuf&,1)
NEXT
REM - If odd length, read 1 more byte
IF (icLen& OR 1) = icLen& THEN
rLen& = xRead&(fHandle&,inbuf&,1)
END IF
END IF
REM - Done if got all chunks
IF foundBMHD AND foundCMAP AND foundABIT THEN
GOTO GoodLoad
END IF
REM - Good read, get next chunk
IF rLen& > 0 THEN GOTO ChunkLoop
IF rLen& < 0 THEN 'Read error
loadError$ = "Read error"
GOTO Lcleanup
END IF
REM - rLen& = 0 means EOF
IF (foundBMHD=0) OR (foundABIT=0) OR (foundCMAP=0) THEN
loadError$ = "Needed ILBM chunks not found"
GOTO Lcleanup
END IF
GoodLoad:
loadError$ =""
REM Load proper Colors
IF foundCMAP THEN
CALL LoadRGB4&(sViewPort&,ctab&,nColors%)
END IF
Lcleanup:
IF fHandle& <> 0 THEN CALL xClose&(fHandle&)
IF mybuf& <> 0 THEN CALL FreeMem&(mybuf&,mybufsize&)
RETURN
GetScrAddrs:
REM - Get addresses of screen structures
sWindow& = WINDOW(7)
sScreen& = PEEKL(sWindow& + 46)
sViewPort& = sScreen& + 44
sRastPort& = sScreen& + 84
sColorMap& = PEEKL(sViewPort& + 4)
colorTab& = PEEKL(sColorMap& + 4)
sBitMap& = PEEKL(sRastPort& + 4)
REM - Get screen parameters
scrWidth% = PEEKW(sScreen& + 12)
scrHeight% = PEEKW(sScreen& + 14)
scrDepth% = PEEK(sBitMap& + 5)
nColors% = 2^scrDepth%
REM - Get addresses of Bit Planes
FOR kk = 0 TO scrDepth% - 1
bPlane&(kk) = PEEKL(sBitMap&+8+(kk*4))
NEXT
RETURN