binaries/assimp-3.1.1/code/BlenderTessellator.h

/*
Open Asset Import Library (assimp)
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*/

/** @file  BlenderTessellator.h
 *  @brief A simple tessellation wrapper
 */
#ifndef INCLUDED_AI_BLEND_TESSELLATOR_H
#define INCLUDED_AI_BLEND_TESSELLATOR_H

// Use these to toggle between GLU Tessellate or poly2tri
// Note (acg) keep GLU Tesselate disabled by default - if it is turned on,
// assimp needs to be linked against GLU, which is currently not yet 
// made configurable in CMake and potentially not wanted by most users
// as it requires a Gl environment.
#ifndef ASSIMP_BLEND_WITH_GLU_TESSELLATE
#	define ASSIMP_BLEND_WITH_GLU_TESSELLATE 0
#endif

#ifndef ASSIMP_BLEND_WITH_POLY_2_TRI
#	define ASSIMP_BLEND_WITH_POLY_2_TRI 1
#endif

#include "LogAux.h"

#if ASSIMP_BLEND_WITH_GLU_TESSELLATE

#if defined( WIN32 ) || defined( _WIN32 ) || defined( _MSC_VER )
#include <windows.h>
#endif
#include <GL/glu.h>

namespace Assimp
{
	class BlenderBMeshConverter;

	// TinyFormatter.h
	namespace Formatter
	{
		template < typename T,typename TR, typename A > class basic_formatter;
		typedef class basic_formatter< char, std::char_traits< char >, std::allocator< char > > format;
	}

	// BlenderScene.h
	namespace Blender
	{
		struct MLoop;
		struct MVert;

		struct VertexGL
		{
			GLdouble X;
			GLdouble Y;
			GLdouble Z;
			int index;
			int magic;

			VertexGL( GLdouble X, GLdouble Y, GLdouble Z, int index, int magic ): X( X ), Y( Y ), Z( Z ), index( index ), magic( magic ) { }
		};

		struct DrawCallGL
		{
			GLenum drawMode;
			int baseVertex;
			int vertexCount;

			DrawCallGL( GLenum drawMode, int baseVertex ): drawMode( drawMode ), baseVertex( baseVertex ), vertexCount( 0 ) { }
		};

		struct TessDataGL
		{
			std::vector< DrawCallGL > drawCalls;
			std::vector< VertexGL > vertices;
		};
	}

	class BlenderTessellatorGL: public LogFunctions< BlenderTessellatorGL >
	{
	public:
		BlenderTessellatorGL( BlenderBMeshConverter& converter );
		~BlenderTessellatorGL( );

		void Tessellate( const Blender::MLoop* polyLoop, int vertexCount, const std::vector< Blender::MVert >& vertices );

	private:
		void AssertVertexCount( int vertexCount );
		void GenerateLoopVerts( std::vector< Blender::VertexGL >& polyLoopGL, const Blender::MLoop* polyLoop, int vertexCount, const std::vector< Blender::MVert >& vertices );
		void Tesssellate( std::vector< Blender::VertexGL >& polyLoopGL, Blender::TessDataGL& tessData );
		void TriangulateDrawCalls( const Blender::TessDataGL& tessData );
		void MakeFacesFromTris( const Blender::VertexGL* vertices, int vertexCount );
		void MakeFacesFromTriStrip( const Blender::VertexGL* vertices, int vertexCount );
		void MakeFacesFromTriFan( const Blender::VertexGL* vertices, int vertexCount );

		static void TessellateBegin( GLenum drawModeGL, void* userData );
		static void TessellateEnd( void* userData );
		static void TessellateVertex( const void* vtxData, void* userData );
		static void TessellateCombine( const GLdouble intersection[ 3 ], const GLdouble* [ 4 ], const GLfloat [ 4 ], GLdouble** out, void* userData );
		static void TessellateEdgeFlag( GLboolean edgeFlag, void* userData );
		static void TessellateError( GLenum errorCode, void* userData );

		BlenderBMeshConverter* converter;
	};
} // end of namespace Assimp

#endif // ASSIMP_BLEND_WITH_GLU_TESSELLATE

#if ASSIMP_BLEND_WITH_POLY_2_TRI

#include "../contrib/poly2tri/poly2tri/poly2tri.h"

namespace Assimp
{
	class BlenderBMeshConverter;

	// TinyFormatter.h
	namespace Formatter
	{
		template < typename T,typename TR, typename A > class basic_formatter;
		typedef class basic_formatter< char, std::char_traits< char >, std::allocator< char > > format;
	}

	// BlenderScene.h
	namespace Blender
	{
		struct MLoop;
		struct MVert;

		struct PointP2T
		{
			aiVector3D point3D;
			p2t::Point point2D;
			int magic;
			int index;
		};

		struct PlaneP2T
		{
			aiVector3D centre;
			aiVector3D normal;
		};
	}

	class BlenderTessellatorP2T: public LogFunctions< BlenderTessellatorP2T >
	{
	public:
		BlenderTessellatorP2T( BlenderBMeshConverter& converter );
		~BlenderTessellatorP2T( );

		void Tessellate( const Blender::MLoop* polyLoop, int vertexCount, const std::vector< Blender::MVert >& vertices );

	private:
		void AssertVertexCount( int vertexCount );
		void Copy3DVertices( const Blender::MLoop* polyLoop, int vertexCount, const std::vector< Blender::MVert >& vertices, std::vector< Blender::PointP2T >& targetVertices ) const;
		aiMatrix4x4 GeneratePointTransformMatrix( const Blender::PlaneP2T& plane ) const;
		void TransformAndFlattenVectices( const aiMatrix4x4& transform, std::vector< Blender::PointP2T >& vertices ) const;
		void ReferencePoints( std::vector< Blender::PointP2T >& points, std::vector< p2t::Point* >& pointRefs ) const;
		inline Blender::PointP2T& GetActualPointStructure( p2t::Point& point ) const;
		void MakeFacesFromTriangles( std::vector< p2t::Triangle* >& triangles ) const;

		// Adapted from: http://missingbytes.blogspot.co.uk/2012/06/fitting-plane-to-point-cloud.html
		float FindLargestMatrixElem( const aiMatrix3x3& mtx ) const;
		aiMatrix3x3 ScaleMatrix( const aiMatrix3x3& mtx, float scale ) const;
		aiVector3D GetEigenVectorFromLargestEigenValue( const aiMatrix3x3& mtx ) const;
		Blender::PlaneP2T FindLLSQPlane( const std::vector< Blender::PointP2T >& points ) const;

		BlenderBMeshConverter* converter;
	};
} // end of namespace Assimp

#endif // ASSIMP_BLEND_WITH_POLY_2_TRI

#endif // INCLUDED_AI_BLEND_TESSELLATOR_H