SDL Input framework

mdl/m_sdlcrt.pas

@@ -39,34 +39,98 @@ Uses
   SDL;
 
 Const
-  AppWindowX = 640;
-  AppWindowY = 480;
+  AppWindowX   = 800;
+  AppWindowY   = 600;
+  AppInputSize = 128;
 
 Type
   TSDLScreenMode = (mode_80x25, mode_80x50, mode_132x50);
 
   TSDLConsole = Class
+    InputBuffer : Array[1..AppInputSize] of Char;
+    InputPos    : Integer;
+    InputSize   : Integer;
+
     InputEvent : pSDL_EVENT;
     Screen     : pSDL_SURFACE;
 
-    Constructor Create;
+    Constructor Create     (InitMode: TSDLScreenMode);
     Destructor  Destroy;
+
+    Procedure   PushInput  (Ch: Char);
+    Procedure   ProcessEvent;
+    Function    KeyPressed : Boolean;
+    Procedure   Delay      (MS: LongInt);
   End;
 
 Implementation
 
-Constructor TSDLConsole.Create;
+Constructor TSDLConsole.Create (InitMode: TSDLScreenMode);
 Begin
   Inherited Create;
 
   SDL_INIT(SDL_INIT_VIDEO OR SDL_INIT_EVENTTHREAD);
+
+  Screen := SDL_SetVideoMode(AppWindowX, AppWindowY, 32, SDL_SWSURFACE);
+
+  If Screen = NIL Then Halt;
+
+  New (InputEvent);
+
+  InputSize := 0;
+  InputPos  := 0;
 End;
 
 Destructor TSDLConsole.Destroy;
 Begin
+  Dispose (InputEvent);
+
   SDL_QUIT;
 
   Inherited Destroy;
 End;
 
+Procedure TSDLConsole.PushInput (Ch: Char);
+Begin
+  Inc (InputSize);
+
+  If InputSize > AppInputSize Then Begin
+    InputSize := 1;
+    InputPos  := 1;
+  End;
+
+  InputBuffer[InputSize] := Ch;
+End;
+
+Procedure TSDLConsole.ProcessEvent;
+Begin
+  Case InputEvent^.Type_ of
+    SDL_KEYDOWN : Case InputEvent^.Key.KeySym.Sym of
+                    // remap SDL keys to pascal CRT
+                    27 : PushInput(#27);
+                  Else
+                    PushInput(Chr(InputEvent^.Key.KeySym.Sym));
+                  End;
+  End;
+End;
+
+Function TSDLConsole.KeyPressed : Boolean;
+Var
+  Queued : LongInt;
+Begin
+  Result := False;
+
+  Queued := SDL_PollEvent(InputEvent);
+
+  If Queued > 0 Then
+    ProcessEvent;
+
+  Result := InputSize > 0;
+End;
+
+Procedure TSDLConsole.Delay (MS: LongInt);
+Begin
+  SDL_DELAY(MS);
+End;
+
 End.