assimp/code/ColladaExporter.h

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

Copyright (c) 2006-2012, assimp team
All rights reserved.

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* 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
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  written permission of the assimp team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

/** @file ColladaExporter.h
 * Declares the exporter class to write a scene to a Collada file
 */
#ifndef AI_COLLADAEXPORTER_H_INC
#define AI_COLLADAEXPORTER_H_INC

#include "../include/assimp/ai_assert.h"
#include "../include/assimp/material.h"
#include "../include/assimp/mesh.h"
#include "../include/assimp/Exporter.hpp"
#include <sstream>
#include <vector>
#include <map>
#include <boost/lexical_cast.hpp>

struct aiScene;
struct aiNode;

namespace Assimp	
{

/// Helper class to export a given scene to a Collada file. Just for my personal
/// comfort when implementing it.
class ColladaExporter
{
public:
	/// Constructor for a specific scene to export
	ColladaExporter( const aiScene* pScene, IOSystem* pIOSystem, const std::string& path, const std::string& file);

	/// Destructor
	virtual ~ColladaExporter();

protected:
	/// Starts writing the contents
	void WriteFile();

	/// Writes the asset header
	void WriteHeader();

	/// Writes the embedded textures
	void WriteTextures();

	/// Writes the material setup
	void WriteMaterials();

	/// Writes the geometry library
	void WriteGeometryLibrary();

	/// Writes the given mesh
	void WriteGeometry( size_t pIndex);

	enum FloatDataType { FloatType_Vector, FloatType_TexCoord2, FloatType_TexCoord3, FloatType_Color };

	/// Writes a float array of the given type
	void WriteFloatArray( const std::string& pIdString, FloatDataType pType, const float* pData, size_t pElementCount);

	/// Writes the scene library
	void WriteSceneLibrary();

	/// Recursively writes the given node
	void WriteNode( aiNode* pNode);

	/// Enters a new xml element, which increases the indentation
	void PushTag() { startstr.append( "  "); }
	/// Leaves an element, decreasing the indentation
	void PopTag() { ai_assert( startstr.length() > 1); startstr.erase( startstr.length() - 2); }

	/// Creates a mesh ID for the given mesh
	std::string GetMeshId( size_t pIndex) const { return std::string( "meshId" ) + boost::lexical_cast<std::string> (pIndex); }

public:
	/// Stringstream to write all output into
	std::stringstream mOutput;

protected:
	/// The IOSystem for output
	IOSystem* mIOSystem;

	/// Path of the directory where the scene will be exported
	const std::string mPath;

	/// Name of the file (without extension) where the scene will be exported
	const std::string mFile;

	/// The scene to be written
	const aiScene* mScene;
	bool mSceneOwned;

	/// current line start string, contains the current indentation for simple stream insertion
	std::string startstr;
	/// current line end string for simple stream insertion
	std::string endstr;

  // pair of color and texture - texture precedences color
  struct Surface 
  { 
    bool exist;
    aiColor4D color; 
    std::string texture; 
    size_t channel; 
    Surface() { exist = false; channel = 0; }
  };

  struct Property
  {
    bool exist;
	 float value;
	 Property()
         : exist(false)
         , value(0.0f)
     {}
  };

  // summarize a material in an convinient way. 
  struct Material
  {
    std::string name;
    std::string shading_model;
    Surface ambient, diffuse, specular, emissive, reflective, transparent, normal;
   	Property shininess, transparency, index_refraction;

    Material() {}
  };

  std::vector<Material> materials;

  std::map<unsigned int, std::string> textures;

protected:
  /// Dammit C++ - y u no compile two-pass? No I have to add all methods below the struct definitions
  /// Reads a single surface entry from the given material keys
  void ReadMaterialSurface( Surface& poSurface, const aiMaterial* pSrcMat, aiTextureType pTexture, const char* pKey, size_t pType, size_t pIndex);
  /// Writes an image entry for the given surface
  void WriteImageEntry( const Surface& pSurface, const std::string& pNameAdd);
  /// Writes the two parameters necessary for referencing a texture in an effect entry
  void WriteTextureParamEntry( const Surface& pSurface, const std::string& pTypeName, const std::string& pMatName);
  /// Writes a color-or-texture entry into an effect definition
  void WriteTextureColorEntry( const Surface& pSurface, const std::string& pTypeName, const std::string& pImageName);
  /// Writes a scalar property
  void WriteFloatEntry( const Property& pProperty, const std::string& pTypeName);
};

}

#endif // !! AI_COLLADAEXPORTER_H_INC