HPAVC/HPAVC CD-ROM.iso/pc/PXDTUT5.ZIP/PXDTUT5.PAS

Pascal/Delphi Source File | 1997-08-14 | 12.9 KB | 547 lines

Program VESA_UNIT;

uses
 crt;

CONST
 HEXTABLE : Array[0..15] of char
 = ('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F');

type
 ListOfAvailModesT = Array[0..255] of word; {terminated by -1 ($FFFF) }
 ListOfAvailModesP = ^ListOfAvailModesT;

 String2 = String[2];
 String4 = String[4];


 VESAInfoT = record
              VESASignature : array[0..3] of byte;
              VESAVersion   : word;
              OEMStringPtr  : Pchar;
              Capabilities  : array[0..3] of byte;
              VideoModePtr  : ListOfAvailModesP;
              TotalMemory   : word;
              Reserved      : Array[0..235] of byte;
             end;

 ModeAttributesT = (Available,          {mode avail on current hardware config..}
                   Reserved,            {VESA 1.2 and above this is set to 1}
                   BIOSFunctionsSupport,{Scroll, TTY output and pixel output}
                   color,
                   graphic,
                   bit5,
                   bit6,
                   bit7,
                   bit8);


 WindowAttributesT  = (Supported,R,W);   {rest of the bits are unused...}




 VESAModeInfoT = record
                   ModeAttributes     : set of ModeAttributesT;
                   WinAAttributes     : set of WindowAttributesT;
                   WinBAttributes     : set of WindowAttributesT;
                   WinGranularity     : word;
                   WinSize            : word;
                   WinASegment        : word;
                   WinBSegment        : word;
                   BankSwitch         : procedure;
                   BytesPerScanLine   : word;

                   {Xtended Information}
                   XResolution        : word;
                   YResolution        : word;
                   XCharSize          : byte;
                   YCharSize          : byte;
                   NumberOfPlanes     : byte;
                   BitsPerPixel       : byte;
                   NumberOfBanks      : byte;
                   MemoryModel        : byte;
                   BankSize           : byte;
                   NumberOfImagePages : byte;

                   Reserved           : Array[0..225] of byte;
                   {reserved is for something we won't think about now...
                    true color and stuff...                               }
                 end;


var
 VESAInfo          : VESAInfoT;
 VESAModeInfo      : VESAModeInfoT;

 Cur_page          : word;
 Bankmult          : word;
 BankShiftModifier : word;

 VESAModeList : Array[0..40] of word;

 counter : word;



Procedure Error(msg : string);
begin
 asm
  mov ax,03h
  int 10h
 end;

 Writeln(msg);
 HALT;
end;


function Byte2Hex(b : byte) : String2;
var
 temp : string2;
begin
 temp[1] := HEXTABLE[b shr 4];
 temp[2] := HEXTABLE[b mod 16];
 Byte2Hex := temp;
end;

function Word2Hex(w : word) : String4;
begin
  Word2Hex:=Byte2Hex(hi(w))+Byte2Hex(lo(w));
end;



FUNCTION GetVESAInfo : boolean;
Assembler;
asm
 mov ah,4Fh
 mov al,00h
 lea di,VESAInfo
 int 10h
 cmp ah,0
 jne @fail
 mov ax,1
 jmp @out
@fail:
 mov ax,0
@out:
end;

FUNCTION GetVESAModeInfo(mode : word) : boolean;
Assembler;
asm
 mov ah,4Fh
 mov al,01h
 xor cx,cx
 mov cx,mode
 lea di,VESAModeInfo
 int 10h
 cmp ah,0
 jne @fail
 mov ax,1
 jmp @out
@fail:
 mov ax,0
@out:
end;


Procedure SetBank(nr : word);
Assembler;
asm
 xor bl,bl                       {Window 0 selected}
 mov dx,nr
 call [VESAModeInfo.BankSwitch]
 mov dx,nr                       {dx is destroyed by far procedure call}
 mov cur_page,dx                 {update global page variable}
end;

Procedure SetLogicalScanline(width : word);
Assembler;
asm
 mov ah,4Fh
 mov al,06h
 mov bl,0
 mov cx,width
 int 10h
end;


Procedure SetScreenPosition(x,y : word);
Assembler;
asm
 mov ah,4Fh
 mov al,07h
 xor bx,bx
 mov cx,[x]
 mov dx,[y]
 int 10h
end;


FUNCTION SetVESAMode(mode : word) : boolean;
Assembler;
asm
 mov ax,03h
 int 10h              {start from textmode}

 mov ah,4Fh
 mov al,02h
 mov bx,mode
 int 10h
 cmp ah,0
 jne @fail            {set the VESA mode through VESA function 02h}

 mov ah,4Fh
 mov al,05h
 xor bx,bx
 mov dx,0
 int 10h
 mov cur_page,0       {initialize global page variable}
 cmp ah,0
 jne @fail            {Set bank 0}

 mov ax,1             {Set call to succesful}
 jmp @out
@fail:
 mov ax,0
@out:
end;


PROCEDURE   VESAputpixel(x, y : WORD; c : BYTE);
VAR
  bank   : WORD;
  offs   : longint;
BEGIN

  offs := LONGINT(y) * VESAModeInfo.Xresolution + x;
  bank := offs SHR (16-BankShiftModifier);
  offs := offs - (bank SHL (16-BankShiftModifier));

  IF bank <> Cur_page THEN {page = global var - active page}
  BEGIN
    cur_page := bank;
    ASM
      Xor bl,bl
      mov dx,bank
      call [VESAModeInfo.BankSwitch]
    END;
   END;

  ASM
    MOV AX, $A000
    MOV ES, ax
    MOV DI, WORD(offs)
    MOV AL, c
    MOV ES:[DI], AL
  END;
END;


PROCEDURE ClearScreen(color : byte);
var
 Xres, Yres : longint;
 number_of_segments : longint;
 i : integer;
begin
 Xres := VESAModeInfo.Xresolution;
 Yres := VESAModeInfo.Yresolution;
 number_of_segments  := Round(((Xres *  Yres)/65536)+0.5)-1;

 for i := 0 to number_of_segments do
  begin
   SetBank(i*BankMult);
   asm
     mov     cx, 32768;
     mov     ax,$A000
     mov     es,ax
     xor     di,di
     mov     al,[color]
     mov     ah,al
     rep     stosw
    end;
  end;
end;





Procedure SetCursor(X,Y : byte);
Assembler;
asm
 mov ah,02h
 xor bh,bh
 mov dh,[Y]
 mov dl,[X]
 int 10h
end;

Procedure WriteChar(chnr,color : byte);
assembler;
asm
 mov ah,09h
 mov al,[chnr]
 mov bh,0
 mov bl,[color]
 mov cx,1
 int 10h
end;



Procedure WriteXY(x,y : integer;str : string; color : byte);
var
 i : byte;
begin
 SetCursor(x,y);
 for i := 1 to length(str) do
  begin
   WriteChar(ord(str[i]),color);
   SetCursor(X+i,Y);
  end;
end;



function ModeInList(nr : word) : boolean;
var
 i : integer;
 found : boolean;
begin
 found := false;
 for i := 0 to 40 do
  if VESAModeList[i] = nr then found := true;
 if found then ModeInList := true else ModeInList := false;
end;


Procedure Calc_variables;
begin
Case VESAModeInfo.WinGranularity of
 1  : BankShiftModifier := 6;
 2  : BankShiftModifier := 5;
 4  : BankShiftModifier := 4;
 8  : BankShiftModifier := 3;
 16 : BankShiftModifier := 2;
 32 : BankShiftModifier := 1;
 64 : BankShiftModifier := 0;
end;    {With granularities smaller than 64 but with page-size 64K the
         banknr for each full segment of SVGA graphic will not be 0,1,2,3
         but multiplied with BankMult ( 2^BankShiftModifier for easy bit
         shifting)                                                         }
BankMult := 64 div VESAModeInfo.WinGranularity;
end;



Procedure WriteVESAInfo;
var
 i : integer;
begin
 for i := 0 to 3 do
 Write(chr(VESAInfo.VESASignature[i]));

 Write(' ');
 Writeln('Version : ',VESAInfo.VESAVersion shr 8,'.',VESAInfo.VESAVersion mod 256);
 Writeln(VESAInfo.OEMStringPtr);
 Writeln('Total Memory : ',VESAInfo.TotalMemory,' X 64Kb = '
         ,VESAInfo.TotalMemory * 65536,' bytes = ',
          VESAInfo.TotalMemory * 65536 div 1048576 ,'MB');
 Writeln;
end;

Procedure ModeList;
var
 i : integer;
 p : ^word;
begin
Writeln('Modes Available : ');
Writeln;
for i := 0 to 40 do VESAModeList[i] := 0;
i := 0;
p := pointer(VESAInfo.VideoModePtr);
while p^ <> $FFFF do
 begin
   if Not(ModeInList(P^)) then
    begin
     VESAModeList[i] := p^;
     inc(i);
     Write('$',Word2Hex(p^));
     GetVESAModeInfo(p^);
     write(' ',VESAModeInfo.Xresolution : 5,' X ',VESAModeInfo.Yresolution:3);
     Write('   BPP : ',VESAModeInfo.BitsPerPixel:2);
     if color in VESAModeInfo.ModeAttributes then Write(' Color') else
        write(' Monocrome');
     if graphic in VESAModeInfo.ModeAttributes then Write('  Graphic') else
        write(' Textmode');

     if supported in VESAModeInfo.WinAAttributes then
      begin
       write(' Win A :');
       if R in VESAModeInfo.WinAAttributes then Write(' R');
       if W in VESAModeInfo.WinAAttributes then Write('W');
       write(' at : $',Word2Hex(VESAModeInfo.WinASegment));
      end;
     if supported in VESAModeInfo.WinBAttributes then
      begin
       write(' Win B :');
       if R in VESAModeInfo.WinBAttributes then Write(' R');
       if W in VESAModeInfo.WinBAttributes then Write('W');
       write(' at : $',Word2Hex(VESAModeInfo.WinASegment));
      end;

     Write('  Gran : ',VESAModeInfo.WinGranularity:2,'Kb');
     Writeln;
    end;
   inc(p);
 end;
end;




BEGIN
asm
 mov ax,03h
 int 10h
end;
Clrscr;
Writeln('      ****************************************************************');
Writeln('      *                                                              *');
Writeln('      *                      SVGA using VESA 1.2                     *');
Writeln('      *                        by : Telemachos                       *');
Writeln('      *                                                              *');
Writeln('      ****************************************************************');
Writeln;
Writeln('      Hiya! ');
Writeln('      Welcome to the Peroxide Programming Tips #5');
Writeln('      This one is on coding the SVGA card using VESA 1.2');
Writeln('      This code *SHOULD* work on every graphic card that');
Writeln('      supports VESA 1.2 (which is about every card now a days)');
Writeln('                                                                      ');
Writeln('      This program will :');
Writeln('         1) Display information about your SVGA card');
Writeln('         2) Display available modes on your card..');
Writeln('         3) Cycle through the most common SVGA modes (256 colors)');
Writeln('         4) Show you how to hardware scroll using the VESA BIOS');
Writeln;
Writeln('         Hit any key to get started....');
Writeln;
readkey;

clrscr;

If Not(GetVesaInfo) then Error('No VESA installed...');

WriteVESAInfo;
ModeList;
Writeln;
Writeln('Press space to continue');


readkey;

Randomize;
if ModeInList($100) then
begin
 if NOT(SetVESAMode($100)) then exit;
 GetVESAModeInfo($100);
 Calc_variables;
 ClearScreen(Random(255));
 for counter := 0 to 10000 do
  VESAPutPixel(Random(VESAModeInfo.Xresolution),
               Random(VESAModeInfo.Yresolution),
               Random(255));
 WriteXY(5,2,'This is 640 X 400 X 256',50);
 WriteXY(5,4,'Press space for next mode...',50);
 fillchar(VESAModeInfo,256,0);
end;
readkey;

if ModeInList($101) then
begin
 if NOT(SetVESAMode($101)) then exit;
 GetVESAModeInfo($101);
 Calc_variables;
 ClearScreen(Random(255));
 for counter := 0 to 10000 do
  VESAPutPixel(Random(VESAModeInfo.Xresolution),
               Random(VESAModeInfo.Yresolution),
               Random(255));
 WriteXY(5,2,'This is 640 X 480 X 256',50);
 WriteXY(5,4,'Press space for next mode...',50);
 fillchar(VESAModeInfo,256,0);
end;
readkey;

if ModeInList($103) then
begin
 if NOT(SetVESAMode($103)) then exit;
 GetVESAModeInfo($103);
 Calc_variables;
 ClearScreen(Random(255));
 for counter := 0 to 10000 do
  VESAPutPixel(Random(VESAModeInfo.Xresolution),
               Random(VESAModeInfo.Yresolution),
               Random(255));
 WriteXY(5,2,'This is 800 X 600 X 256',50);
 WriteXY(5,4,'Press space for next mode...',50);
 fillchar(VESAModeInfo,256,0);
end;
readkey;

if ModeInList($105) then
begin
 if NOT(SetVESAMode($105)) then exit;
 if Not(GetVESAModeInfo($105)) then Error('Ups.. noget galt her...');
 Calc_variables;
 ClearScreen(Random(255));
 for counter := 0 to 10000 do
  VESAPutPixel(Random(VESAModeInfo.Xresolution),
               Random(VESAModeInfo.Yresolution),
               Random(255));
 WriteXY(5,2,'This is 1024 X 768 X 256',50);
 WriteXY(5,4,'Press space for Hardware Scroll demo...',50);
 fillchar(VESAModeInfo,256,0);
end;
readkey;

if ModeInList($101) then
begin
 if NOT(SetVESAMode($101)) then exit;
 GetVESAModeInfo($101);
 Calc_variables;
 SetLogicalScanLine(1024);
 VESAModeInfo.Xresolution := 1024;
 SetScreenPosition(0,0);

 ClearScreen(Random(255));
 for counter := 0 to 10000 do
  VESAPutPixel(Random(VESAModeInfo.Xresolution),
               Random(VESAModeInfo.Yresolution*2),
               Random(255));

 for counter := 0 to 150 do SetScreenPosition(counter*2,0);
 for counter := 150 downto 0 do SetScreenPosition(counter*2,0);
 for counter := 0 to 150 do SetScreenPosition(counter*2,Counter*2);
 for counter := 150 to 1040 do SetScreenPosition(300,counter*2);

 fillchar(VESAModeInfo,256,0);
end
 else
WriteXY(5,7,'Mode $101 is unavailble on your card.. Skipping Scroll.',50);

delay(2000);

asm
 mov ax,03h
 int 10h
end;

Writeln('All for now.. Signin'' out');
Writeln('     Telemachos.');
delay(5000);
END.