assimp/code/Vertex.h

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

Copyright (c) 2006-2008, ASSIMP Development Team
All rights reserved.

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  following disclaimer.

* Redistributions in binary form must reproduce the above
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  following disclaimer in the documentation and/or other
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* Neither the name of the ASSIMP team, nor the names of its
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  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/
/** @file Defines a helper class to represent an interleaved vertex */
#ifndef AI_VERTEX_H_INC
#define AI_VERTEX_H_INC
namespace Assimp	{
	
	///////////////////////////////////////////////////////////////////////////
	// std::plus-family operates on operands with identical types - we need to
	// support all the (vectype op float) combinations in vector maths. 
	// Providing T(float) would open the way to endless implicit conversions.
	///////////////////////////////////////////////////////////////////////////
	namespace Intern {
		template <typename T0, typename T1, typename TRES = T0> struct plus {
			TRES operator() (const T0& t0, const T1& t1) const {
				return t0+t1;
			}
		};
		template <typename T0, typename T1, typename TRES = T0> struct minus {
			TRES operator() (const T0& t0, const T1& t1) const {
				return t0-t1;
			}
		};
		template <typename T0, typename T1, typename TRES = T0> struct multiplies {
			TRES operator() (const T0& t0, const T1& t1) const {
				return t0*t1;
			}
		};
		template <typename T0, typename T1, typename TRES = T0> struct divides {
			TRES operator() (const T0& t0, const T1& t1) const {
				return t0/t1;
			}
		};
	}

// ------------------------------------------------------------------------------------------------
/** Intermediate description a vertex with all possible components. Defines a full set of 
 *  operators, so you may use such a 'Vertex' in basic arithmetics. All operators are applied
 *  to *all* vertex components equally. This is useful for stuff like interpolation
 *  or subdivision, but won't work if special handling is required for some vertex components. */
// ------------------------------------------------------------------------------------------------
class Vertex
{
	friend Vertex operator + (const Vertex&,const Vertex&);
	friend Vertex operator - (const Vertex&,const Vertex&);

	friend Vertex operator + (const Vertex&,float);
	friend Vertex operator - (const Vertex&,float);
	friend Vertex operator * (const Vertex&,float);
	friend Vertex operator / (const Vertex&,float);

	friend Vertex operator + (float, const Vertex&);
	friend Vertex operator - (float, const Vertex&);
	friend Vertex operator * (float, const Vertex&);
	friend Vertex operator / (float, const Vertex&);

public:

	Vertex() {}

	// ----------------------------------------------------------------------------
	/** Extract a particular vertex from a mesh and interleave all components */
	explicit Vertex(const aiMesh* msh, unsigned int idx) {
		ai_assert(idx < msh->mNumVertices);
		position = msh->mVertices[idx];

		if (msh->HasNormals()) {
			normal = msh->mNormals[idx];
		}

		if (msh->HasTangentsAndBitangents()) {
			tangent = msh->mTangents[idx];
			bitangent = msh->mBitangents[idx];
		}

		for (unsigned int i = 0; msh->HasTextureCoords(i); ++i) {
			texcoords[i] = msh->mTextureCoords[i][idx];
		}

		for (unsigned int i = 0; msh->HasVertexColors(i); ++i) {
			colors[i] = msh->mColors[i][idx];
		}
	}

public:

	Vertex& operator += (const Vertex& v) {
		*this = *this+v;
		return *this;
	}

	Vertex& operator -= (const Vertex& v) {
		*this = *this-v;
		return *this;
	}



	Vertex& operator += (float v) {
		*this = *this+v;
		return *this;
	}

	Vertex& operator -= (float v) {
		*this = *this-v;
		return *this;
	}

	Vertex& operator *= (float v) {
		*this = *this*v;
		return *this;
	}

	Vertex& operator /= (float v) {
		*this = *this/v;
		return *this;
	}

public:

	// ----------------------------------------------------------------------------
	/** Convert back to non-interleaved storage */
	void SortBack(aiMesh* out, unsigned int idx) const {

		ai_assert(idx<out->mNumVertices);
		out->mVertices[idx] = position;

		if (out->HasNormals()) {
			out->mNormals[idx] = normal;
		}

		if (out->HasTangentsAndBitangents()) {
			out->mTangents[idx] = tangent;
			out->mBitangents[idx] = bitangent;
		}

		for(unsigned int i = 0; out->HasTextureCoords(i); ++i) {
			out->mTextureCoords[i][idx] = texcoords[i];
		}

		for(unsigned int i = 0; out->HasVertexColors(i); ++i) {
			out->mColors[i][idx] = colors[i];
		}
	}

private:

	// ----------------------------------------------------------------------------
	/** Construct from two operands and a binary operation to combine them */
	template <template <typename t> class op> static Vertex BinaryOp(const Vertex& v0, const Vertex& v1) {
		// this is a heavy task for the compiler to optimize ... *pray*

		Vertex res;
		res.position  = op<aiVector3D>()(v0.position,v1.position);
		res.normal    = op<aiVector3D>()(v0.normal,v1.normal);
		res.tangent   = op<aiVector3D>()(v0.tangent,v1.tangent);
		res.bitangent = op<aiVector3D>()(v0.bitangent,v1.bitangent);

		for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
			res.texcoords[i] = op<aiVector3D>()(v0.texcoords[i],v1.texcoords[i]);
		}
		for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_COLOR_SETS; ++i) {
			res.colors[i] = op<aiColor4D>()(v0.colors[i],v1.colors[i]);
		}
		return res;
	}

	// ----------------------------------------------------------------------------
	/** This time binary arithmetics of v0 with a floating-point number */
	template <template <typename, typename, typename> class op> static Vertex BinaryOp(const Vertex& v0, float f) {
		// this is a heavy task for the compiler to optimize ... *pray*

		Vertex res;
		res.position  = op<aiVector3D,float,aiVector3D>()(v0.position,f);
		res.normal    = op<aiVector3D,float,aiVector3D>()(v0.normal,f);
		res.tangent   = op<aiVector3D,float,aiVector3D>()(v0.tangent,f);
		res.bitangent = op<aiVector3D,float,aiVector3D>()(v0.bitangent,f);

		for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
			res.texcoords[i] = op<aiVector3D,float,aiVector3D>()(v0.texcoords[i],f);
		}
		for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_COLOR_SETS; ++i) {
			res.colors[i] = op<aiColor4D,float,aiColor4D>()(v0.colors[i],f);
		}
		return res;
	}

	// ----------------------------------------------------------------------------
	/** This time binary arithmetics of v0 with a floating-point number */
	template <template <typename, typename, typename> class op> static Vertex BinaryOp(float f, const Vertex& v0) {
		// this is a heavy task for the compiler to optimize ... *pray*

		Vertex res;
		res.position  = op<float,aiVector3D,aiVector3D>()(f,v0.position);
		res.normal    = op<float,aiVector3D,aiVector3D>()(f,v0.normal);
		res.tangent   = op<float,aiVector3D,aiVector3D>()(f,v0.tangent);
		res.bitangent = op<float,aiVector3D,aiVector3D>()(f,v0.bitangent);

		for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
			res.texcoords[i] = op<float,aiVector3D,aiVector3D>()(f,v0.texcoords[i]);
		}
		for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_COLOR_SETS; ++i) {
			res.colors[i] = op<float,aiColor4D,aiColor4D>()(f,v0.colors[i]);
		}
		return res;
	}

public:

	aiVector3D position;
	aiVector3D normal;
	aiVector3D tangent, bitangent;

	aiVector3D texcoords[AI_MAX_NUMBER_OF_TEXTURECOORDS];
	aiColor4D colors[AI_MAX_NUMBER_OF_COLOR_SETS];
};



// ------------------------------------------------------------------------------------------------
AI_FORCE_INLINE Vertex operator + (const Vertex& v0,const Vertex& v1) {
	return Vertex::BinaryOp<std::plus>(v0,v1);
}

AI_FORCE_INLINE Vertex operator - (const Vertex& v0,const Vertex& v1) {
	return Vertex::BinaryOp<std::minus>(v0,v1);
}

// ------------------------------------------------------------------------------------------------
AI_FORCE_INLINE Vertex operator + (const Vertex& v0,float f) {
	return Vertex::BinaryOp<Intern::plus>(v0,f);
}

AI_FORCE_INLINE Vertex operator - (const Vertex& v0,float f) {
	return Vertex::BinaryOp<Intern::minus>(v0,f);
}

AI_FORCE_INLINE Vertex operator * (const Vertex& v0,float f) {
	return Vertex::BinaryOp<Intern::multiplies>(v0,f);
}

AI_FORCE_INLINE Vertex operator / (const Vertex& v0,float f) {
	return Vertex::BinaryOp<Intern::divides>(v0,f);
}

// ------------------------------------------------------------------------------------------------
AI_FORCE_INLINE Vertex operator + (float f,const Vertex& v0) {
	return Vertex::BinaryOp<Intern::plus>(f,v0);
}

AI_FORCE_INLINE Vertex operator - (float f,const Vertex& v0) {
	return Vertex::BinaryOp<Intern::minus>(f,v0);
}

AI_FORCE_INLINE Vertex operator * (float f,const Vertex& v0) {
	return Vertex::BinaryOp<Intern::multiplies>(f,v0);
}

AI_FORCE_INLINE Vertex operator / (float f,const Vertex& v0) {
	return Vertex::BinaryOp<Intern::divides>(f,v0);
}

}
#endif