0032203: Draw Harness, ViewerTest - drop dependency from OpenGL

Added TKOpenGlTest and TKD3DHostTest Draw Harness plugins.
TKOpenGlTest is automatically loaded by ViewerTest::ViewerInit().

Commands vgldebug, vvbo, vcaps and vuserdraw have been moved to TKOpenGlTest.
New command vglshaders lists GLSL programs defined by OpenGl_GraphicDriver,
previously implemented by "vshaderprog -list".

Added new command vdriver for graphic driver selection.
Removed erroneous code from command vstereo.

src/D3DHostTest/D3DHostTest.cxx

@@ -0,0 +1,33 @@
+// Copyright (c) 2021 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#include <D3DHostTest.hxx>
+
+#include <Draw_PluginMacro.hxx>
+#include <D3DHost_GraphicDriverFactory.hxx>
+
+// ======================================================================
+// function : Factory
+// purpose  :
+// ======================================================================
+void D3DHostTest::Factory (Draw_Interpretor& )
+{
+  static const Handle(D3DHost_GraphicDriverFactory) aFactory = new D3DHost_GraphicDriverFactory();
+  Graphic3d_GraphicDriverFactory::RegisterFactory (aFactory);
+#ifdef DEB
+  theDI << "Draw Plugin : D3DHost commands are loaded.\n";
+#endif
+}
+
+// Declare entry point PLUGINFACTORY
+DPLUGIN(D3DHostTest)

src/D3DHostTest/D3DHostTest.hxx

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+// Copyright (c) 2021 OPEN CASCADE SAS
+//
+// This file is part of Open CASCADE Technology software library.
+//
+// This library is free software; you can redistribute it and/or modify it under
+// the terms of the GNU Lesser General Public License version 2.1 as published
+// by the Free Software Foundation, with special exception defined in the file
+// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
+// distribution for complete text of the license and disclaimer of any warranty.
+//
+// Alternatively, this file may be used under the terms of Open CASCADE
+// commercial license or contractual agreement.
+
+#ifndef _D3DHostTest_HeaderFile
+#define _D3DHostTest_HeaderFile
+
+#include <Draw_Interpretor.hxx>
+
+//! This package defines a set of Draw commands for testing of TKD3DHost library.
+class D3DHostTest
+{
+public:
+
+  DEFINE_STANDARD_ALLOC
+
+  //! Adds Draw commands to the draw interpretor.
+  Standard_EXPORT static void Commands (Draw_Interpretor& theDI);
+
+  //! Plugin entry point function.
+  Standard_EXPORT static void Factory (Draw_Interpretor& theDI);
+};
+
+#endif // _D3DHostTest_HeaderFile

src/D3DHostTest/FILES

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+D3DHostTest.cxx
+D3DHostTest.hxx