- function InitOpenGL: Boolean;
 - begin
 -  if (GLHandle = INVALID_MODULEHANDLE) or (GLUHandle = INVALID_MODULEHANDLE) then
 -    Result := InitOpenGLFromLibrary(SDefaultGLLibrary, SDefaultGLULibrary)
 -  else
 -    Result := True;
 - end;
 - //----------------------------------------------------------------------------------------------------------------------
 - function InitOpenGLFromLibrary(GLName, GLUName: string): Boolean;
 - begin
 -  Result := False;
 -  CloseOpenGL;
 -  {$IFDEF Win32}
 -  GLHandle := LoadLibrary(PChar(GLName));
 -  GLUHandle := LoadLibrary(PChar(GLUName));
 -  {$ENDIF}
 -  {$IFDEF LINUX}
 -  GLHandle := dlopen(PChar(GLName), RTLD_GLOBAL or RTLD_LAZY);
 -  GLUHandle := dlopen(PChar(GLUName), RTLD_GLOBAL or RTLD_LAZY);
 -  {$ENDIF}
 -  if (GLHandle <> INVALID_MODULEHANDLE) and (GLUHandle <> INVALID_MODULEHANDLE) then
 -  begin
 -    LoadProcAddresses;
 -    Result := True;
 -  end
 -  else
 -  begin
 -    if GLHandle <>  INVALID_MODULEHANDLE then
 -      FreeLibrary(Cardinal(GLHandle));
 -    if GLUHandle <>  INVALID_MODULEHANDLE then
 -      FreeLibrary(Cardinal(GLUHandle));
 -  end;
 - end;
 
