'===========================================================================
' Subject: MANIPULTAING DAC DATA             Date: 03-17-99 (13:15)       
' Author:  Jacob Wieles                      Code: QB, QBasic, PDS, PB    
' Origin:  jacwls@worldonline.nl           Packet: EGAVGA.ABC
'===========================================================================
'program      : DACAC12C.BAS  (16-03-99)
'which basic  : PowerBASIC and Q(uick)BASIC
'auteur       : Jacob Wieles

defint a-z
dim dac(63,2),ac(15),ncol(63,2)
color 14
cls
print"  This program shows in the SCREEN 12 the colors"
print"  yellow, magenta, cyan and gray."
print"  For compatibility with PowerBASIC and Q(uick)BASIC, the"
print"  folowing procedures (SUB) are used.  :":?
print"  GetDacData(dummy())              read data from the DAC."
print"  SetNewDac(dummy(())              set new data in the DAC."
print"  SetNewColor(index,R,G,B)         set new data in one DAC index."
print"                                   remove the remouts in front of the"
print"                                   lines 141 and 142 to see how"
print"                                   SetNewColor works."
print"  GetAttrContr(dummy())            read the AC setting."
print"  NewPalette(attr,col)             a compatible Palette statement"
print"                                   for Power- and Q(uick)BASIC."
print
print"  DAC ---->> Digital Analog Converter."
print"  AC  ---->> Attibute Controler."
print
print"  After a key hit the program tryed screen 12."
print"  If there an error occurs then the program stop."
call NextKeyHit(23,31,"next")
on error goto NoVGA
screen 12


sub GetDacData(dummy())
  out &H3C7,0
  for i=0 to 63
    for j=0 to 2
      dummy(i,j)=inp(&H3C9)
    next j
  next i
end sub

sub SetNewDac(dummy(),index)
  out &H3C8,0
  for i=0 to index
    for j=0 to 2
      out &H3C9,dummy(i,j)
    next j
  next i
end sub

sub SetNewColor(index,R,G,B)
  out &H3C8,index and 63
  out &H3C9,R and 63
  out &H3C9,G and 63
  out &h3C9,B and 63
end sub

sub GetAttrContr(dummy())
  dummy=inp(&H3DA)
  for i=0 to 15
    out &H3C0,i
    out &H3C0,inp(&H3C1)
    dummy(i)=inp(&H3C1)
  next i
  out &H3C0,32
end sub

sub NewPalette(attr,col)
  dummy=inp(&H3DA)
  out &H3C0,attr and 15
  out &H3C0,col and 63
  out &H3C0,32
end sub

sub NextKeyHit(r,k,fillto$)
  while inkey$<>"":wend
  locate r,k
  print"Hit a key for ";fillto$;".";
  while inkey$="":wend
  locate r,k
  print"               ";space$(len(fillto$))
end sub

restore WhichColor
for i=0 to 3
  read whichcol$(i)
next i

  cls
  call GetDacData(dac())   ' Save the default DAC data.
  call GetAttrContr(ac())  ' Save the AC setting.

'Make new data for array ncol to used for fill DAC-index 0 to 15 four times
  for p=0 to 3
    for i=0 to 15
      select case p
      case 0 '==> yellow
        ncol(p*16+i,0)=18+i*3  'intensity red
        ncol(p*16+i,1)=18+i*3  'intensity green
        ncol(p*16+i,2)=0       'intensity blue
      case 1 '==> magenta
        ncol(p*16+i,0)=18+i*3
        ncol(p*16+i,1)=0
        ncol(p*16+i,2)=18+i*3
      case 2 '==> cyan
        ncol(p*16+i,0)=0
        ncol(p*16+i,1)=18+i*3
        ncol(p*16+i,2)=18+i*3
      case 3  '==> gray
        ncol(p*16+i,0)=18+i*3
        ncol(p*16+i,1)=18+i*3
        ncol(p*16+i,2)=18+i*3
      end select
    next i
  next p


'draw boxes with invisible lines and paint
  for i=0 to 15
    call NewPalette(i,0)
  next i
  ybox=16
  for i=0 to 15
    xi=72+i*32
    line(xi,ybox+2)-step(30,2*ybox),15,b
    paint(xi+15,ybox+4),i,15
  next i
'and make every things visible
  for i=0 to 15
    call NewPalette(i,i)
  next i

'===========>>> set colors on the screen
  locate 7,1
  print"               DAC-INDEX    ";
  print"     Red       Green        Blue"
  for countcol=0 to 3
  locate 1,35
  print whichcol$(countcol)
    for col=0 to 15
'      w!=timer
'      while timer<w!+.3:wend
      index=col+countcol*16
      call SetNewColor(col,ncol(index,0),ncol(index,1),ncol(index,2))
    next col
    for j=0 to 15
      p=j
      gosub numstr
      locate 5,11+j*4:print pr$
      locate 8+j,22:print pr$
      for l=0 to 2
        p=ncol(countcol*16+j,l)
        gosub numstr
	locate 8+j,34+12*l:print pr$
      next l
    next j
    call NextKeyHit(1,1,"next")
    locate 1,1:print space$(75);
    locate 5,1:print space$(75);
    for i=0 to 16
      locate 8+i,1
      print space$(75);
    next i
  next countcol
  locate 7,1:print space$(78);

' ******> set the default data and colors <******


  call SetNewDac(dac(),63) 'default data in DAC

  for i=0 to 15 '========================>>> default colors in AC
    call NewPalette(i,ac(i))
  next i

  locate 5,20
  print"The palette is set to the default colors."
  locate 7,20
  print"The DAC data is set to the default values."
  call NextKeyHit(18,31,"end")
endprog:
cls
screen 0
w!=timer 'prevent screen flicker
while timer<w!+1:wend
print"  Tanks for running. Hit a key for the source."
end

numstr:
pr$=right$(str$(p),len(str$(p))-1)
if len(pr$)=1 then pr$="0"+pr$
return

NoVGA:
cls
print"  With SCREEN 12 the error with err";err;"occurs."
print
resume endprog

WhichColor:
data "16 Colors with Red and Green. (Yellow)"
data "16 Colors with Red and Blue. (Magenta)"
data "16 Colors with Green and Blue. (Cyan) "
data "16 Colors with Red, Green and Blue.   "