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mysticbbs/mdl/m_sdlcrt.pas

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Unit m_SDLCRT;
{$I M_OPS.PAS}
(*
Goals:
- Cross platform input and output capable of 80x25, 80x50, 132x50
- Input events remapped as compatible with current code base
- Full screen mode in Windows, OSX, and Linux if possible
- Direct access (read only) to a virtual screen buffer something like:
TSDLScreenBuffer = Record
Line : Array[1..132] of Record
Ch : Char;
Attr : Byte;
End;
- Current X location
- Current Y location
- Current Text Attribute
- Window function to set scroll points
- GotoXY
- Clear Screen (window based)
- Clear to end of line (with current attribute)
- Set Window title
- Hide screen
- Show Buffer
- KeyPressed : Boolean
- KeyWait (Timeout in seconds or MS) : Boolean
- ReadKey (from buffer, or waits infinity if nothing)
- Ability to wait for input event based on handle for WaitForMultipleObj ?
- Ability to play a .WAV/MP3/MIDI file or at least some sound?
- How to handle shutdown and resize window events? Lock resize?
- How to handle minimize? Minimize to tray in Windows?
*)
Interface
Uses
SDL,
SDL_TTF;
Const
keyENTER = #13;
keyESCAPE = #27;
keyHOME = #71;
keyUP = #72;
keyPGUP = #73;
keyLEFT = #75;
keyRIGHT = #77;
keyEND = #79;
keyDOWN = #80;
keyPGDN = #81;
keyINSERT = #82;
keyDELETE = #83;
AppInputSize = 128;
SDLFontSize : Byte = 24;
SDLFontSpace : Byte = 0;
SDLAppWindowX : Word = 800;
SDLAppWindowY : Word = 600;
Type
TSDLScreenMode = (mode_80x25, mode_80x50, mode_132x50);
TSDLKeyMap = Record
SDL : Word;
Key : String[2];
Shift : String[2];
Alt : String[2];
Ctrl : String[2];
End;
TSDLConsole = Class
InputEvent : pSDL_EVENT;
Screen : pSDL_SURFACE;
Font : pTTF_Font;
InputBuffer : Array[1..AppInputSize] of Char;
InputPos : Integer;
InputSize : Integer;
CursorX : Byte;
CursorY : Byte;
TextAttr : Byte;
// INIT STUFF
Constructor Create (InitMode: TSDLScreenMode);
Destructor Destroy; Override;
// INTERNAL STUFF
Procedure PushInput (Ch: Char);
Procedure PushExt (Ch: Char);
Procedure PushStr (Str: String);
Procedure ProcessEvent;
// Function GetDosForeground (Color: Byte) : TSDL_Color;
// Function GetDosBackground (Color: Byte) : TSDL_Color;
// FUNCTIONAL
Function KeyPressed : Boolean;
Function ReadKey : Char;
Procedure Delay (MS: LongInt);
Procedure SetTitle (Title: String);
Procedure ShowBuffer;
//NONSENSE
Procedure TestStuff;
End;
Implementation
// SDL fails hard with keyboard handling. I think we need to use
// a lookup table that can be externalized into a data file so different
// countries can load their specific keyboard set.
//
// I just assumed things like this would NOT be a problem in SDL. Pretty
// disappointing actually. So below is the US mapping as I get time to
// work on it.
Const
SDLKeyMapSize = 3;
SDLKeyMapUS : Array[1..SDLKeyMapSize] of TSDLKeyMap = (
(SDL:SDLK_1; Key:'1'; Shift:'!'; Alt:'1'; CTRL:'1'),
(SDL:SDLK_2; Key:'2'; Shift:'@'; Alt:'2'; CTRL:'2'),
(SDL:SDLK_SLASH; Key:'/'; Shift:'?'; Alt:'/'; CTRL:'/')
);
SDLDosColor : Array[0..15] of TSDL_Color = (
(R:000; G:000; B:000; Unused: 0), //00
(R:000; G:000; B:128; Unused: 0), //01
(R:000; G:128; B:000; Unused: 0), //02
(R:000; G:128; B:128; Unused: 0), //03
(R:170; G:000; B:000; Unused: 0), //04
(R:128; G:000; B:128; Unused: 0), //05
(R:128; G:128; B:000; Unused: 0), //06
(R:192; G:192; B:192; Unused: 0), //07
(R:128; G:128; B:128; Unused: 0), //08
(R:000; G:000; B:255; Unused: 0), //09
(R:000; G:255; B:000; Unused: 0), //10
(R:000; G:255; B:255; Unused: 0), //11
(R:255; G:000; B:000; Unused: 0), //12
(R:255; G:000; B:255; Unused: 0), //13
(R:255; G:255; B:000; Unused: 0), //14
(R:255; G:255; B:255; Unused: 0) //15
);
Constructor TSDLConsole.Create (InitMode: TSDLScreenMode);
Begin
Inherited Create;
SDL_INIT(SDL_INIT_VIDEO);
// Screen := SDL_SetVideoMode(SDLAppWindowX, SDLAppWindowY, 32, SDL_HWSURFACE or SDL_FULLSCREEN);
Screen := SDL_SetVideoMode(SDLAppWindowX, SDLAppWindowY, 32, SDL_HWSURFACE);
If Screen = NIL Then Halt;
If TTF_Init = -1 Then Halt;
// Font := TTF_OpenFont('ASCII.ttf', SDLFontSize);
Font := TTF_OpenFont('\dev\sdl\Perfect DOS VGA 437.ttf', SDLFontSize);
If Font = NIL Then Halt;
New (InputEvent);
InputSize := 0;
InputPos := 0;
CursorX := 1;
CursorY := 1;
TextAttr := 7;
End;
Destructor TSDLConsole.Destroy;
Begin
Dispose (InputEvent);
TTF_CloseFont(Font);
TTF_Quit;
SDL_QUIT;
Inherited Destroy;
End;
Procedure TSDLConsole.PushInput (Ch: Char);
Begin
Inc (InputSize);
If InputSize > AppInputSize Then Begin
InputSize := 1;
InputPos := 0;
End;
InputBuffer[InputSize] := Ch;
End;
Procedure TSDLConsole.PushExt (Ch: Char);
Begin
PushInput(#0);
PushInput(Ch);
End;
Procedure TSDLConsole.PushStr (Str: String);
Begin
PushInput (Str[1]);
If Length(Str) > 1 Then PushInput (Str[2]);
End;
Procedure TSDLConsole.ProcessEvent;
Var
IsShift : Boolean = False;
IsCaps : Boolean = False;
IsAlt : Boolean = False;
IsCtrl : Boolean = False;
Found : Boolean;
Count : Integer;
Begin
IsShift := (InputEvent^.Key.KeySym.Modifier AND KMOD_SHIFT <> 0);
IsCaps := (InputEvent^.Key.KeySym.Modifier AND KMOD_CAPS <> 0);
IsAlt := (InputEvent^.Key.KeySym.Modifier AND KMOD_ALT <> 0);
IsCtrl := (InputEvent^.Key.KeySym.Modifier AND KMOD_CTRL <> 0);
Case InputEvent^.Type_ of
SDL_KEYDOWN : Begin
Case InputEvent^.Key.KeySym.Sym of
SDLK_A..
SDLK_Z : Begin
If IsShift or IsCaps Then Dec (InputEvent^.Key.KeySym.Sym, 32);
PushInput (Chr(InputEvent^.Key.KeySym.Sym));
End;
SDLK_DELETE : PushExt(keyDELETE);
SDLK_UP : PushExt(keyUP);
SDLK_DOWN : PushExt(keyDOWN);
SDLK_RIGHT : PushExt(keyRIGHT);
SDLK_LEFT : PushExt(keyLEFT);
SDLK_INSERT : PushExt(keyINSERT);
SDLK_HOME : PushExt(keyHome);
SDLK_END : PushExt(keyEnd);
SDLK_PAGEUP : PushExt(keyPGUP);
SDLK_PAGEDOWN : PushExt(keyPGDN);
SDLK_NUMLOCK..
SDLK_COMPOSE : //ignore mod keys;
Else
Found := False;
For Count := 1 to SDLKeyMapSize Do
If InputEvent^.Key.KeySym.Sym = SDLKeyMapUS[Count].SDL Then Begin
If IsShift Then
PushStr(SDLKeyMapUS[Count].Shift)
Else
If IsAlt Then
PushStr(SDLKeyMapUS[Count].Alt)
Else
If IsCTRL Then
PushStr(SDLKeyMapUS[Count].CTRL)
Else
PushStr(SDLKeyMapUS[Count].Key);
Found := True;
Break;
End;
If Not Found Then PushInput(Chr(InputEvent^.Key.KeySym.Sym));
End;
End;
SDL_QUITEV : Halt;
End;
End;
Function TSDLConsole.KeyPressed : Boolean;
Begin
If SDL_PollEvent(InputEvent) > 0 Then
ProcessEvent;
Result := InputPos <> InputSize;
End;
Function TSDLConsole.ReadKey : Char;
Begin
If InputPos = InputSize Then
Repeat
SDL_WaitEvent(InputEvent);
ProcessEvent;
Until (InputSize <> InputPos);
Inc (InputPos);
Result := InputBuffer[InputPos];
If InputPos = InputSize Then Begin
InputPos := 0;
InputSize := 0;
End;
End;
Procedure TSDLConsole.Delay (MS: LongInt);
Begin
SDL_DELAY(MS);
End;
Procedure TSDLConsole.SetTitle (Title: String);
Begin
Title := Title + #0;
SDL_WM_SetCaption(PChar(@Title[1]), PChar(@Title[1]));
End;
Procedure TSDLConsole.TestStuff;
Var
Rect : TSDL_Rect = (X:0; Y:0; W:0; H:0);
Surface : PSDL_Surface;
Text : String;
Count : Byte;
Begin
Text := #176 + 'SDL Demo! Press Escape to quit!' + #0;
Surface := TTF_RenderText_Shaded (Font, PChar(@Text[1]), SDLDosColor[7], SDLDosColor[0]);
SDL_BlitSurface (Surface, NIL, Screen, @Rect);
SDL_FreeSurface (Surface);
For Count := 3 to 17 Do Begin
Text := #219 + '2345678901234567890123456789012345678901234567890123456789012345678901234567890';
Rect.Y := (Count - 1) * SDLFontSize + SDLFontSpace;
Surface := TTF_RenderText_Shaded (Font, PChar(@Text[1]), SDLDosColor[Count-2], SDLDosColor[0]);
SDL_BlitSurface (Surface, NIL, Screen, @Rect);
SDL_FreeSurface (Surface);
End;
For Count := 18 to 25 Do Begin
Text := #219 + '2345678901234567890123456789012345678901234567890123456789012345678901234567890';
Rect.Y := (Count - 1) * SDLFontSize + SDLFontSpace;
Surface := TTF_RenderText_Shaded (Font, PChar(@Text[1]), SDLDosColor[7], SDLDosColor[0]);
SDL_BlitSurface (Surface, NIL, Screen, @Rect);
SDL_FreeSurface (Surface);
End;
SDL_Flip(Screen);
End;
Procedure TSDLConsole.ShowBuffer;
Begin
SDL_Flip(Screen);
End;
End.
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