1 // Created on: 2011-08-05
2 // Created by: Sergey ZERCHANINOV
3 // Copyright (c) 2011-2014 OPEN CASCADE SAS
5 // This file is part of Open CASCADE Technology software library.
7 // This library is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU Lesser General Public License version 2.1 as published
9 // by the Free Software Foundation, with special exception defined in the file
10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11 // distribution for complete text of the license and disclaimer of any warranty.
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
16 #ifndef OpenGl_Element_Header
17 #define OpenGl_Element_Header
19 #include <OpenGl_RenderFilter.hxx>
20 #include <Standard_Type.hxx>
22 class OpenGl_Workspace;
25 //! Base interface for drawable elements.
30 Standard_EXPORT OpenGl_Element();
32 virtual void Render (const Handle(OpenGl_Workspace)& theWorkspace) const = 0;
34 //! Release GPU resources.
35 //! Pointer to the context is used because this method might be called
36 //! when the context is already being destroyed and usage of a handle
38 virtual void Release (OpenGl_Context* theContext) = 0;
40 //! Pointer to the context is used because this method might be called
41 //! when the context is already being destroyed and usage of a handle
43 template <typename theResource_t>
44 static void Destroy (OpenGl_Context* theContext,
45 theResource_t*& theElement)
47 if (theElement == NULL)
52 theElement->Release (theContext);
53 OpenGl_Element* anElement = theElement;
60 //! Return TRUE if primitive type generates shaded triangulation (to be used in filters).
61 virtual Standard_Boolean IsFillDrawMode() const { return false; }
63 //! Update parameters of the drawable elements.
64 virtual void SynchronizeAspects() {}
68 Standard_EXPORT virtual ~OpenGl_Element();
76 #endif // OpenGl_Element_Header