BLENDER: Fix potential stack overflow caused by a DOM object referencing itself.

Add general infrastructure to apply modifiers.
Implement mirror and subdivision modifiers using existing stuff.
Update BlenderDNA with related structures.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@763 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/BlenderModifier.h

@@ -0,0 +1,155 @@
+/*
+Open Asset Import Library (ASSIMP)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2010, ASSIMP Development Team
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms, 
+with or without modification, are permitted provided that the 
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the ASSIMP team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the ASSIMP Development Team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file  BlenderModifier.h
+ *  @brief Declare dedicated helper classes to simulate some blender modifiers (i.e. mirror)
+ */
+#ifndef INCLUDED_AI_BLEND_MODIFIER_H
+#define INCLUDED_AI_BLEND_MODIFIER_H
+
+#include "BlenderIntermediate.h"
+#include "TinyFormatter.h"
+namespace Assimp {
+	namespace Blender {
+
+// -------------------------------------------------------------------------------------------
+/** Dummy base class for all blender modifiers. Modifiers are reused between imports, so
+ *  they should be stateless and not try to cache model data. */
+// -------------------------------------------------------------------------------------------
+class BlenderModifier 
+{
+public:
+
+	virtual ~BlenderModifier() {
+	}
+
+public:
+
+	// --------------------
+	/** Check if *this* modifier is active, given a ModifierData& block.*/
+	virtual bool IsActive( const ModifierData& modin) {
+		return false;
+	}
+
+	// --------------------
+	/** Apply the modifier to a given output node. The original data used
+	 *  to construct the node is given as well. Not called unless IsActive()
+	 *  was called and gave positive response. */
+	virtual void DoIt(aiNode& out, 
+		ConversionData& conv_data,  
+		const ElemBase& orig_modifier, 
+		const Scene& in, 
+		const Object& orig_object 
+	) {
+		DefaultLogger::get()->warn((Formatter::format("This modifier is not supported, skipping: "),orig_modifier.dna_type));
+		return;
+	}
+};
+
+
+// -------------------------------------------------------------------------------------------
+/** Manage all known modifiers and instance and apply them if necessary */
+// -------------------------------------------------------------------------------------------
+class BlenderModifierShowcase
+{
+public:
+
+	// --------------------
+	/** Apply all requested modifiers provided we support them. */
+	void ApplyModifiers(aiNode& out,
+		ConversionData& conv_data, 
+		const Scene& in, 
+		const Object& orig_object 
+	);
+
+private:
+
+	TempArray< std::vector,BlenderModifier > cached_modifiers;
+};
+
+
+
+
+
+// MODIFIERS
+
+
+
+// -------------------------------------------------------------------------------------------
+/** Mirror modifier. Status: implemented. */
+// -------------------------------------------------------------------------------------------
+class BlenderModifier_Mirror : public BlenderModifier
+{
+public:
+
+	// --------------------
+	virtual bool IsActive( const ModifierData& modin);
+	
+	// --------------------
+	virtual void DoIt(aiNode& out, 
+		ConversionData& conv_data,  
+		const ElemBase& orig_modifier, 
+		const Scene& in, 
+		const Object& orig_object 
+	) ;
+};
+
+// -------------------------------------------------------------------------------------------
+/** Subdivision modifier. Status: dummy. */
+// -------------------------------------------------------------------------------------------
+class BlenderModifier_Subdivision : public BlenderModifier
+{
+public:
+
+	// --------------------
+	virtual bool IsActive( const ModifierData& modin);
+	
+	// --------------------
+	virtual void DoIt(aiNode& out, 
+		ConversionData& conv_data,  
+		const ElemBase& orig_modifier, 
+		const Scene& in, 
+		const Object& orig_object 
+	) ;
+};
+
+
+}}
+#endif // !INCLUDED_AI_BLEND_MODIFIER_H