Dowload Text File
$if 0
SUB V12print( Row%, Col%, Txt$, Fgrnd?, Bgrnd? )
Row% - starting row; 1 to 30
Col% - starting column; 1 to 80
Txt$ - what you want printed
Fgrnd? - foreground color; 0 to 15
Bgrnd? - background color; 0 to 15
This routine will print 8x16 characters to SCREEN 12 in any color
combination you require regardless of the COLOR settings.
Yes, it's a bit slow, even on my Pentium 200 (2400 chars in .11sec)
but it DOES allow you to print text to your VGA screen using ANY
color attributes, so, it's a bit of a trade off.
LoadCharArray is a kludge routine to load some character data into
the buffer. I recommend that you make a data file(s) for your font(s)
and load directly from there into the buffer.
Enjoy,
Don
$endif
DECLARE SUB V12print ( BYVAL Row%, BYVAL Col%, BYVAL Txt$, _
BYVAL Fgrnd?, BYVAL Bgrnd? )
DIM Buf(4095) AS SHARED BYTE
DIM B_ptr AS SHARED BYTE PTR
B_ptr = VARPTR32( Buf?(0) )
' -------------------------------------------
' --------- test code
' -------------------------------------------
DECLARE SUB LoadCharArray ()
SCREEN 12
LoadCharArray
DELAY 2
DIM Row AS INTEGER
DIM T AS STRING
DIM T1 AS SINGLE
DIM T2 AS SINGLE
T$ = STRING$(2400,65)
CLS
T1! = TIMER
PRINT T$;
T1! = TIMER - T1!
DELAY 1
CLS
T2! = TIMER
V12print 1, 1, T$, 14, 1
T2! = TIMER - T2!
T$ = USING$( " ##.### ", T1! ) + _
USING$( "##.### ", T2! )
FOR Row% = 1 TO 15
V12print Row%+1, 2, T$, Row%, 0
NEXT
WHILE NOT INSTAT : WEND
SCREEN 0
END
' -------------------------------------------
' --------- the routine
' -------------------------------------------
SUB V12print ( BYVAL Row AS INTEGER, _
BYVAL Col AS INTEGER, _
BYVAL Txt AS STRING , _
BYVAL Fgrnd AS BYTE , _
BYVAL Bgrnd AS BYTE ) LOCAL PUBLIC
DIM BgMask AS LOCAL INTEGER ' background mask
DIM Boff AS LOCAL INTEGER ' byte offset for char buffer
DIM ByteMask AS LOCAL INTEGER ' byte mask being 'put' to the screen
DIM FgMask AS LOCAL INTEGER ' foreground mask
DIM PixelRow AS LOCAL INTEGER ' pixel row relative to starting row
DIM Plane AS LOCAL INTEGER ' pixel plane mask
DIM S_ptr AS LOCAL BYTE PTR ' screen pointer
DIM Tlen AS LOCAL INTEGER ' text length
DIM Toff AS LOCAL INTEGER ' text index
DIM T_ptr AS LOCAL BYTE PTR ' text pointer
Tlen% = LEN(Txt$) ' get the length of the $
IF Tlen% = 0 THEN EXIT SUB ' oops, nothing to do
T_ptr = STRPTR32( Txt$ ) ' set the pointer to the $
DECR Tlen% ' 0 based for index
DECR Row% ' 0 based
DECR Col% ' 0 based
S_ptr = &hA0000000 ' screen pointer
INCR S_ptr, ( ( Row% * 1280 ) + Col% ) ' set to row/col offset
'
OUT &h03C4, 2 ' tell VGA we're printing
FOR Toff% = 0 TO Tlen% ' once for each character
Boff% = @T_ptr[Toff%] ' chr$
SHIFT LEFT Boff%, 4 ' * 16 for buffer offset
FOR PixelRow% = 0 TO 15 ' once for each byte in char
FgMask% = @B_ptr[Boff%] ' set foreground mask
BgMask% = ( FgMask% XOR 255 ) ' create background mask
Plane% = 8 ' set plane #
DO ' once for each plane bank
OUT &h03C5, Plane% ' tell VGA to switch bank
IF ( Plane% AND Fgrnd? ) THEN ' if fgrnd is in this plane
ByteMask% = FgMask% ' make this the mask
ELSE ' else
ByteMask% = 0 ' set mask to 0
END IF '
IF ( Plane% AND Bgrnd? ) THEN ' if bgrnd in this plane
ByteMask% = ( ByteMask% OR BgMask% ) ' or on the bgrnd bits
END IF '
@S_ptr = ByteMask% ' set the VGA byte
SHIFT RIGHT Plane%, 1 ' previous plane
LOOP UNTIL Plane% = 0 '
INCR S_ptr, 80 ' next pixel row
INCR Boff% ' next character byte
NEXT '
INCR Col% ' next column
IF Col% < 80 THEN ' if not end of row
DECR S_ptr, 1279 ' bump screen ptr 16 rows
ELSE ' else
DECR S_ptr, 79 ' reset to start of row
Col% = 0 '
END IF '
NEXT '
'
OUT &h03C4, 2 ' reset VGA to normal
OUT &h03C5, 15 '
END SUB
' --------------------------------------------------------------------------
SUB LoadCharArray () LOCAL PUBLIC
DIM B AS LOCAL BYTE ' This routine is a kludge
DIM Boff AS LOCAL INTEGER ' to load character data
DIM Bt AS LOCAL INTEGER ' into the buffer array
DIM Col AS LOCAL INTEGER '
DIM Row AS LOCAL INTEGER ' I recommend that you
DIM X AS LOCAL INTEGER ' store this (or similar)
' info in a file and load
FOR X% = 0 TO 255 ' it directly from there.
LOCATE 1, 1 : PRINT CHR$(X%) '
FOR Row% = 0 TO 15 ' Yes, you can make your
Bt% = 7 ' own character sets.
FOR Col% = 0 TO 7 '
B? = POINT(Col%,Row%) '
IF B? > 0 THEN BIT SET Buf?(Boff%), Bt% '
DECR Bt% '
NEXT '
INCR Boff% '
NEXT '
NEXT '
'
END SUB '