/** @file  IRRShared.h
  * @brief Shared utilities for the IRR and IRRMESH loaders
  */

#ifndef INCLUDED_AI_IRRSHARED_H
#define INCLUDED_AI_IRRSHARED_H

#include "irrXMLWrapper.h"
#include "BaseImporter.h"
#include <stdint.h>
class aiMaterial;

namespace Assimp	{


/** @brief Matrix to convert from Assimp to IRR and backwards
 */
extern const aiMatrix4x4 AI_TO_IRR_MATRIX;


// Default: 0 = solid, one texture
#define AI_IRRMESH_MAT_solid_2layer			0x10000

// Transparency flags
#define AI_IRRMESH_MAT_trans_vertex_alpha	0x1
#define AI_IRRMESH_MAT_trans_add			0x2

// Lightmapping flags
#define AI_IRRMESH_MAT_lightmap				0x2 
#define AI_IRRMESH_MAT_lightmap_m2			(AI_IRRMESH_MAT_lightmap|0x4)
#define AI_IRRMESH_MAT_lightmap_m4			(AI_IRRMESH_MAT_lightmap|0x8)
#define AI_IRRMESH_MAT_lightmap_light		(AI_IRRMESH_MAT_lightmap|0x10)
#define AI_IRRMESH_MAT_lightmap_light_m2	(AI_IRRMESH_MAT_lightmap|0x20)
#define AI_IRRMESH_MAT_lightmap_light_m4	(AI_IRRMESH_MAT_lightmap|0x40)
#define AI_IRRMESH_MAT_lightmap_add			(AI_IRRMESH_MAT_lightmap|0x80)

// Standard NormalMap (or Parallax map, they're treated equally)
#define AI_IRRMESH_MAT_normalmap_solid		(0x100)

// Normal map combined with vertex alpha
#define AI_IRRMESH_MAT_normalmap_tva	\
	(AI_IRRMESH_MAT_normalmap_solid | AI_IRRMESH_MAT_trans_vertex_alpha)

// Normal map combined with additive transparency
#define AI_IRRMESH_MAT_normalmap_ta		\
	(AI_IRRMESH_MAT_normalmap_solid | AI_IRRMESH_MAT_trans_add)

// Special flag. It indicates a second texture has been found
// Its type depends ... either a normal textue or a normal map
#define AI_IRRMESH_EXTRA_2ND_TEXTURE		0x100000

// ---------------------------------------------------------------------------
/** Base class for the Irr and IrrMesh importers.
 *
 *  Declares some irrlight-related xml parsing utilities and provides tools
 *  to load materials from IRR and IRRMESH files. 
 */
class IrrlichtBase
{
protected:

	/** @brief Data structure for a simple name-value property
	 */
	template <class T>
	struct Property
	{
		std::string name;
		T value;
	};

	typedef Property<uint32_t>		HexProperty;
	typedef Property<std::string>	StringProperty;
	typedef Property<bool>			BoolProperty;
	typedef Property<float>			FloatProperty;
	typedef Property<aiVector3D>	VectorProperty;
	typedef Property<int>			IntProperty;

	/** XML reader instance
	 */
  irr::io::IrrXMLReader* reader;

	// -------------------------------------------------------------------
	/** Parse a material description from the XML
	 *  @return The created material
	 *  @param matFlags Receives AI_IRRMESH_MAT_XX flags
	 */
	aiMaterial* ParseMaterial(unsigned int& matFlags);

	// -------------------------------------------------------------------
	/** Read a property of the specified type from the current XML element.
	 *  @param out Recives output data
	 */
	void ReadHexProperty    (HexProperty&    out);
	void ReadStringProperty (StringProperty& out);
	void ReadBoolProperty   (BoolProperty&   out);
	void ReadFloatProperty  (FloatProperty&  out);
	void ReadVectorProperty (VectorProperty&  out);
	void ReadIntProperty    (IntProperty&    out);
};


// ------------------------------------------------------------------------------------------------
// Unpack a hex color, e.g. 0xdcdedfff
inline void ColorFromARGBPacked(uint32_t in, aiColor4D& clr)
{
	clr.a = ((in >> 24) & 0xff) / 255.f;
	clr.r = ((in >> 16) & 0xff) / 255.f;
	clr.g = ((in >>  8) & 0xff) / 255.f;
	clr.b = ((in      ) & 0xff) / 255.f;
}


} // end namespace Assimp

#endif // !! INCLUDED_AI_IRRSHARED_H