mc-mesh/src/main/java/com/aaaaahhhhhhh/bananapuncher714/minietest/MeshingTest3.java

package com.aaaaahhhhhhh.bananapuncher714.minietest;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.bukkit.util.Vector;

import com.aaaaahhhhhhh.bananapuncher714.mesh.Mesh;
import com.aaaaahhhhhhh.bananapuncher714.mesh.Polygon;
import com.aaaaahhhhhhh.bananapuncher714.mesh.region.simple.RegionRuleWinding;
import com.aaaaahhhhhhh.bananapuncher714.mesh.region.simple.RegionSimple;
import com.aaaaahhhhhhh.bananapuncher714.mesh.region.simple.RegionSimple.GluWindingRule;
import com.aaaaahhhhhhh.bananapuncher714.minietest.MeshingTest2.AABB;
import com.aaaaahhhhhhh.bananapuncher714.minietest.objects.ChunkLocation;
import com.aaaaahhhhhhh.bananapuncher714.minietest.objects.mesh.Facet;
import com.aaaaahhhhhhh.bananapuncher714.minietest.objects.mesh.MeshBuilder;
import com.aaaaahhhhhhh.bananapuncher714.minietest.objects.mesh.Plane;

public class MeshingTest3 {
    private static final File BASE = new File( System.getProperty( "user.dir" ) );
    private static final File CHUNK_DIR = new File( BASE, "chunks" );

    public static void main( String[] args ) {
        if ( CHUNK_DIR.exists() && CHUNK_DIR.isDirectory() ) {
            System.out.println( "Found " + CHUNK_DIR.list().length + " files" );
            for ( int i = 0; i < CHUNK_DIR.listFiles().length; ++i ) {
                final File file = CHUNK_DIR.listFiles()[ i ];
                System.out.println( ( i + 1 ) + "/" + CHUNK_DIR.listFiles().length + ":\tMeshing " + file );
                long start = System.currentTimeMillis();
                final List< Plane > planes = mesh( file );
                planes.parallelStream().forEach( p -> {
                    try {
                        process( p );
                    } catch ( IllegalStateException e ) {
                        e.printStackTrace();
                        
                        System.exit( 1 );
                    }
                } );
                
                long time = System.currentTimeMillis() - start;
                
                System.out.println( "\tTook " + time + "ms" );
            }
            
//            final List< Plane > planes = mesh( new File( CHUNK_DIR, "world,-10,-10" ) ); // 25
//            for ( int i = 0; i < planes.size(); ++i ) {
//                System.out.println( "Meshing plane " + i );
//                process( planes.get( i ) );
//            }
            
//            process( planes.get( 27 ) );
        } else {
            System.err.println( "No such directory exists: " + CHUNK_DIR );
        }
    }

    private static void process( final Plane plane ) {
        if ( plane != null ) {
            Mesh< RegionSimple > mesh = new Mesh< RegionSimple >( () -> { return new RegionSimple( GluWindingRule.ODD ); } );
            for ( Polygon poly : plane.polygons ) {
                mesh.addPolygon( poly, RegionRuleWinding.CLOCKWISE );
            }

            mesh.meshify();
        } else {
            System.out.println( "No data!" );
        }
    }
    
    private static List< Plane > mesh( File file ) {
        String name = file.getName();
        String[] split = name.split( "," );
        ChunkLocation location = new ChunkLocation( split[ 0 ], Integer.parseInt( split[ 1 ] ), Integer.parseInt( split[ 2 ] ) );

        System.out.println( "\tParsing chunk " + location );

        // First parse the file to get a list of all bounding boxes that we can use
        List< AABB > boxes = new ArrayList< AABB >();
        try ( BufferedReader reader = new BufferedReader( new FileReader( file ) ) ) {
            String line;
            while ( ( line = reader.readLine() ) != null ) {
                if ( !line.isEmpty() ) {
                    String[] values = line.split( "," );
                    double minX = Double.parseDouble( values[ 0 ] );
                    double minY = Double.parseDouble( values[ 1 ] );
                    double minZ = Double.parseDouble( values[ 2 ] );
                    double maxX = Double.parseDouble( values[ 3 ] );
                    double maxY = Double.parseDouble( values[ 4 ] );
                    double maxZ = Double.parseDouble( values[ 5 ] );
                    boxes.add( new AABB( minX, minY, minZ, maxX, maxY, maxZ ) );
                }
            }
        } catch ( FileNotFoundException e ) {
            e.printStackTrace();
            return null;
        } catch ( IOException e ) {
            e.printStackTrace();
            return null;
        }

        System.out.println( "\tFound " + boxes.size() + " boxes" );
        // Now that we have a bunch of bounding boxes, do whatever

        MeshBuilder builder = new MeshBuilder();
        for ( AABB box : boxes ) {
            for ( Facet facet : generateFacetsFor( box ) ) {
                builder.addFacet( facet );
            }
        }

        return builder.planes;
    }
    
    private static List< Facet > generateFacetsFor( AABB box ) {
        List< Facet > facets = new ArrayList< Facet >();
        
        Vector p1 = new Vector( box.xmin, box.ymin, box.zmin );
        Vector p2 = new Vector( box.xmin, box.ymin, box.zmax );
        Vector p3 = new Vector( box.xmin, box.ymax, box.zmin );
        Vector p4 = new Vector( box.xmin, box.ymax, box.zmax );
        Vector p5 = new Vector( box.xmax, box.ymin, box.zmin );
        Vector p6 = new Vector( box.xmax, box.ymin, box.zmax );
        Vector p7 = new Vector( box.xmax, box.ymax, box.zmin );
        Vector p8 = new Vector( box.xmax, box.ymax, box.zmax );
        
        {
            Facet facet = new Facet();
            facet.points.add( p1 );
            facet.points.add( p2 );
            facet.points.add( p4 );
            facet.points.add( p3 );
            facet.normal = new Vector( -1, 0, 0 );
            facets.add( facet );
        }
        
        {
            Facet facet = new Facet();
            facet.points.add( p5 );
            facet.points.add( p6 );
            facet.points.add( p8 );
            facet.points.add( p7 );
            facet.normal = new Vector( 1, 0, 0 );
            facets.add( facet );
        }
        
        {
            Facet facet = new Facet();
            facet.points.add( p1 );
            facet.points.add( p2 );
            facet.points.add( p6 );
            facet.points.add( p5 );
            facet.normal = new Vector( 0, -1, 0 );
            facets.add( facet );
        }
        
        {
            Facet facet = new Facet();
            facet.points.add( p3 );
            facet.points.add( p4 );
            facet.points.add( p8 );
            facet.points.add( p7 );
            facet.normal = new Vector( 0, 1, 0 );
            facets.add( facet );
        }
        
        {
            Facet facet = new Facet();
            facet.points.add( p1 );
            facet.points.add( p3 );
            facet.points.add( p7 );
            facet.points.add( p5 );
            facet.normal = new Vector( 0, 0, -1 );
            facets.add( facet );
        }
        
        {
            Facet facet = new Facet();
            facet.points.add( p2 );
            facet.points.add( p4 );
            facet.points.add( p8 );
            facet.points.add( p6 );
            facet.normal = new Vector( 0, 0, 1 );
            facets.add( facet );
        }
        
        return facets;
    }
}