* fixed some bugs to compile with Delphi7

uglcContext.pas

@@ -44,6 +44,10 @@ const
   GLC_CONTEXT_VERSION_UNKNOWN = -1;
 
 type
+{$IFNDEF fpc}
+  TThreadID = Cardinal;
+{$ENDIF}
+
   TMultiSample = 1..high(byte);
   TglcContextPixelFormatSettings = packed record
     DoubleBuffered: boolean;
@@ -93,8 +97,8 @@ type
     property PixelFormatSettings: TglcContextPixelFormatSettings read fPixelFormatSettings;
     property VersionSettings:     TglcContextVersionSettings     read fVersionSettings;
 
-    constructor Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings); virtual; overload;
-    constructor Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings; const aVersionSettings: TglcContextVersionSettings); virtual; overload;
+    constructor Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings); overload; virtual;
+    constructor Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings; const aVersionSettings: TglcContextVersionSettings); overload; virtual;
     destructor Destroy; override;
 
     property ThreadID:    TThreadID read fThreadID;
@@ -111,11 +115,13 @@ type
     procedure SetSwapInterval(const aInterval: GLint); virtual; abstract;
     function GetSwapInterval: GLint; virtual; abstract;
     procedure Share(const aContext: TglcContext); virtual; abstract;
-
+{$IFDEF fpc}
   private class var
     fMainContextThreadID: TThreadID;
   public
     class property MainContextThreadID: TThreadID read fMainContextThreadID;
+{$ENDIF}
+  public    
     class function MakePF(DoubleBuffered: boolean = true;
                           Stereo: boolean=false;
                           MultiSampling: TMultiSample=1;
@@ -137,12 +143,20 @@ implementation
 uses
   {$IFDEF WINDOWS}
     uglcContextWGL
-  {$ENDIF}
+  {$ELSE}{$IFDEF WIN32}
+    uglcContextWGL{$IFNDEF fpc}, Windows{$ENDIF}
+  {$ENDIF}{$ENDIF}
+
   {$IFDEF LINUX}
     uglcContextGtk2GLX
   {$ENDIF}
   ;
 
+{$IFNDEF fpc}
+var
+  fMainContextThreadID: TThreadID;
+{$ENDIF}
+
 procedure GlDebugCallbackARB(source: GLenum; type_: GLenum; id: GLuint; severity: GLenum; {%H-}length: GLsizei; const message_: PGLchar; {%H-}userParam: PGLvoid); {$IFDEF WINDOWS}stdcall; {$ELSE}cdecl; {$ENDIF}
 var
   src, typ: String;
@@ -274,12 +288,17 @@ end;
 
 class function TglcContext.GetPlatformClass: TglcContextClass;
 begin
+  Result := nil;
   {$IFDEF WINDOWS}
   Result:= TglcContextWGL;
-  {$ENDIF}
+  {$ELSE}{$IFDEF WIN32}
+  Result:= TglcContextWGL;
+  {$ENDIF}{$ENDIF}
   {$IFDEF LINUX}
   Result:= TglcContextGtk2GLX;
   {$ENDIF}
+  if not Assigned(result) then
+    raise EGLError.Create('unable to find suitabe context class');
 end;
 
 class function TglcContext.IsAnyContextActive: boolean;
@@ -340,7 +359,7 @@ begin
 end;
 
 initialization
-  TglcContext.fMainContextThreadID := 0;
+  {$IFDEF fpc}TglcContext.{$ENDIF}fMainContextThreadID := 0;
 
 end.
 

uglcContextWGL.pas

@@ -21,7 +21,7 @@ type
     FRC: HGLRC;
     fHandle: THandle;
     fPixelFormat: Integer;
-    {%H-}constructor Create(const aControl: TWinControl);
+    {%H-}constructor Create(const aControl: TWinControl); overload;
   protected
     procedure UpdatePixelFormat;
     procedure OpenContext; override;
@@ -29,8 +29,8 @@ type
     function FindPixelFormatNoAA: Integer;
     procedure OpenFromPF(PixelFormat: Integer);
   public
-    constructor Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings); override; overload;
-    constructor Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings; const aVersionSettings: TglcContextVersionSettings); override; overload;
+    constructor Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings); overload; override;
+    constructor Create(const aControl: TWinControl; const aPixelFormatSettings: TglcContextPixelFormatSettings; const aVersionSettings: TglcContextVersionSettings); overload; override;
 
     procedure CloseContext; override;
     procedure Activate; override;