turtlestitch/stitchcode/threee/THREE.MeshLine.js

;(function() {

"use strict";

var root = this

var has_require = typeof require !== 'undefined'

var THREE = root.THREE || has_require && require('three')
if( !THREE )
	throw new Error( 'MeshLine requires three.js' )

function MeshLine() {

	this.positions = [];

	this.previous = [];
	this.next = [];
	this.side = [];
	this.width = [];
	this.indices_array = [];
	this.uvs = [];
	this.counters = [];
	this.geometry = new THREE.BufferGeometry();

	this.widthCallback = null;

}

MeshLine.prototype.setGeometry = function( g, c ) {

	this.widthCallback = c;

	this.positions = [];
	this.counters = [];

	if( g instanceof THREE.Geometry ) {
		for( var j = 0; j < g.vertices.length; j++ ) {
			var v = g.vertices[ j ];
			var c = j/g.vertices.length;
			this.positions.push( v.x, v.y, v.z );
			this.positions.push( v.x, v.y, v.z );
			this.counters.push(c);
			this.counters.push(c);
		}
	}

	if( g instanceof THREE.BufferGeometry ) {
		// read attribute positions ?
	}

	if( g instanceof Float32Array || g instanceof Array ) {
		for( var j = 0; j < g.length; j += 3 ) {
			var c = j/g.length;
			this.positions.push( g[ j ], g[ j + 1 ], g[ j + 2 ] );
			this.positions.push( g[ j ], g[ j + 1 ], g[ j + 2 ] );
			this.counters.push(c);
			this.counters.push(c);
		}
	}

	this.process();

}

MeshLine.prototype.compareV3 = function( a, b ) {

	var aa = a * 6;
	var ab = b * 6;
	return ( this.positions[ aa ] === this.positions[ ab ] ) && ( this.positions[ aa + 1 ] === this.positions[ ab + 1 ] ) && ( this.positions[ aa + 2 ] === this.positions[ ab + 2 ] );

}

MeshLine.prototype.copyV3 = function( a ) {

	var aa = a * 6;
	return [ this.positions[ aa ], this.positions[ aa + 1 ], this.positions[ aa + 2 ] ];

}

MeshLine.prototype.process = function() {

	var l = this.positions.length / 6;

	this.previous = [];
	this.next = [];
	this.side = [];
	this.width = [];
	this.indices_array = [];
	this.uvs = [];

	for( var j = 0; j < l; j++ ) {
		this.side.push( 1 );
		this.side.push( -1 );
	}

	var w;
	for( var j = 0; j < l; j++ ) {
		if( this.widthCallback ) w = this.widthCallback( j / ( l -1 ) );
		else w = 1;
		this.width.push( w );
		this.width.push( w );
	}

	for( var j = 0; j < l; j++ ) {
		this.uvs.push( j / ( l - 1 ), 0 );
		this.uvs.push( j / ( l - 1 ), 1 );
	}

	var v;

	if( this.compareV3( 0, l - 1 ) ){
		v = this.copyV3( l - 2 );
	} else {
		v = this.copyV3( 0 );
	}
	this.previous.push( v[ 0 ], v[ 1 ], v[ 2 ] );
	this.previous.push( v[ 0 ], v[ 1 ], v[ 2 ] );
	for( var j = 0; j < l - 1; j++ ) {
		v = this.copyV3( j );
		this.previous.push( v[ 0 ], v[ 1 ], v[ 2 ] );
		this.previous.push( v[ 0 ], v[ 1 ], v[ 2 ] );
	}

	for( var j = 1; j < l; j++ ) {
		v = this.copyV3( j );
		this.next.push( v[ 0 ], v[ 1 ], v[ 2 ] );
		this.next.push( v[ 0 ], v[ 1 ], v[ 2 ] );
	}

	if( this.compareV3( l - 1, 0 ) ){
		v = this.copyV3( 1 );
	} else {
		v = this.copyV3( l - 1 );
	}
	this.next.push( v[ 0 ], v[ 1 ], v[ 2 ] );
	this.next.push( v[ 0 ], v[ 1 ], v[ 2 ] );

	for( var j = 0; j < l - 1; j++ ) {
		var n = j * 2;
		this.indices_array.push( n, n + 1, n + 2 );
		this.indices_array.push( n + 2, n + 1, n + 3 );
	}

	if (!this.attributes) {
		this.attributes = {
			position: new THREE.BufferAttribute( new Float32Array( this.positions ), 3 ),
			previous: new THREE.BufferAttribute( new Float32Array( this.previous ), 3 ),
			next: new THREE.BufferAttribute( new Float32Array( this.next ), 3 ),
			side: new THREE.BufferAttribute( new Float32Array( this.side ), 1 ),
			width: new THREE.BufferAttribute( new Float32Array( this.width ), 1 ),
			uv: new THREE.BufferAttribute( new Float32Array( this.uvs ), 2 ),
			index: new THREE.BufferAttribute( new Uint16Array( this.indices_array ), 1 ),
			counters: new THREE.BufferAttribute( new Float32Array( this.counters ), 1 )
		}
	} else {
		this.attributes.position.copyArray(new Float32Array(this.positions));
		this.attributes.position.needsUpdate = true;
		this.attributes.previous.copyArray(new Float32Array(this.previous));
		this.attributes.previous.needsUpdate = true;
		this.attributes.next.copyArray(new Float32Array(this.next));
		this.attributes.next.needsUpdate = true;
		this.attributes.side.copyArray(new Float32Array(this.side));
		this.attributes.side.needsUpdate = true;
		this.attributes.width.copyArray(new Float32Array(this.width));
		this.attributes.width.needsUpdate = true;
		this.attributes.uv.copyArray(new Float32Array(this.uvs));
		this.attributes.uv.needsUpdate = true;
		this.attributes.index.copyArray(new Uint16Array(this.indices_array));
		this.attributes.index.needsUpdate = true;
    }

	this.geometry.addAttribute( 'position', this.attributes.position );
	this.geometry.addAttribute( 'previous', this.attributes.previous );
	this.geometry.addAttribute( 'next', this.attributes.next );
	this.geometry.addAttribute( 'side', this.attributes.side );
	this.geometry.addAttribute( 'width', this.attributes.width );
	this.geometry.addAttribute( 'uv', this.attributes.uv );
	this.geometry.addAttribute( 'counters', this.attributes.counters );

	this.geometry.setIndex( this.attributes.index );

}

function memcpy (src, srcOffset, dst, dstOffset, length) {
	var i

	src = src.subarray || src.slice ? src : src.buffer
	dst = dst.subarray || dst.slice ? dst : dst.buffer

	src = srcOffset ? src.subarray ?
	src.subarray(srcOffset, length && srcOffset + length) :
	src.slice(srcOffset, length && srcOffset + length) : src

	if (dst.set) {
		dst.set(src, dstOffset)
	} else {
		for (i=0; i<src.length; i++) {
			dst[i + dstOffset] = src[i]
		}
	}

	return dst
}

/**
 * Fast method to advance the line by one position.  The oldest position is removed.
 * @param position
 */
MeshLine.prototype.advance = function(position) {

	var positions = this.attributes.position.array;
	var previous = this.attributes.previous.array;
	var next = this.attributes.next.array;
	var l = positions.length;

	// PREVIOUS
	memcpy( positions, 0, previous, 0, l );

	// POSITIONS
	memcpy( positions, 6, positions, 0, l - 6 );

	positions[l - 6] = position.x;
	positions[l - 5] = position.y;
	positions[l - 4] = position.z;
	positions[l - 3] = position.x;
	positions[l - 2] = position.y;
	positions[l - 1] = position.z;

    // NEXT
	memcpy( positions, 6, next, 0, l - 6 );

	next[l - 6]  = position.x;
	next[l - 5]  = position.y;
	next[l - 4]  = position.z;
	next[l - 3]  = position.x;
	next[l - 2]  = position.y;
	next[l - 1]  = position.z;

	this.attributes.position.needsUpdate = true;
	this.attributes.previous.needsUpdate = true;
	this.attributes.next.needsUpdate = true;

};

function MeshLineMaterial( parameters ) {

	var vertexShaderSource = [
'precision highp float;',
'',
'attribute vec3 position;',
'attribute vec3 previous;',
'attribute vec3 next;',
'attribute float side;',
'attribute float width;',
'attribute vec2 uv;',
'attribute float counters;',
'',
'uniform mat4 projectionMatrix;',
'uniform mat4 modelViewMatrix;',
'uniform vec2 resolution;',
'uniform float lineWidth;',
'uniform vec3 color;',
'uniform float opacity;',
'uniform float near;',
'uniform float far;',
'uniform float sizeAttenuation;',
'',
'varying vec2 vUV;',
'varying vec4 vColor;',
'varying float vCounters;',
'',
'vec2 fix( vec4 i, float aspect ) {',
'',
'    vec2 res = i.xy / i.w;',
'    res.x *= aspect;',
'	 vCounters = counters;',
'    return res;',
'',
'}',
'',
'void main() {',
'',
'    float aspect = resolution.x / resolution.y;',
'	 float pixelWidthRatio = 1. / (resolution.x * projectionMatrix[0][0]);',
'',
'    vColor = vec4( color, opacity );',
'    vUV = uv;',
'',
'    mat4 m = projectionMatrix * modelViewMatrix;',
'    vec4 finalPosition = m * vec4( position, 1.0 );',
'    vec4 prevPos = m * vec4( previous, 1.0 );',
'    vec4 nextPos = m * vec4( next, 1.0 );',
'',
'    vec2 currentP = fix( finalPosition, aspect );',
'    vec2 prevP = fix( prevPos, aspect );',
'    vec2 nextP = fix( nextPos, aspect );',
'',
'	 float pixelWidth = finalPosition.w * pixelWidthRatio;',
'    float w = 1.8 * pixelWidth * lineWidth * width;',
'',
'    if( sizeAttenuation == 1. ) {',
'        w = 1.8 * lineWidth * width;',
'    }',
'',
'    vec2 dir;',
'    if( nextP == currentP ) dir = normalize( currentP - prevP );',
'    else if( prevP == currentP ) dir = normalize( nextP - currentP );',
'    else {',
'        vec2 dir1 = normalize( currentP - prevP );',
'        vec2 dir2 = normalize( nextP - currentP );',
'        dir = normalize( dir1 + dir2 );',
'',
'        vec2 perp = vec2( -dir1.y, dir1.x );',
'        vec2 miter = vec2( -dir.y, dir.x );',
'        //w = clamp( w / dot( miter, perp ), 0., 4. * lineWidth * width );',
'',
'    }',
'',
'    //vec2 normal = ( cross( vec3( dir, 0. ), vec3( 0., 0., 1. ) ) ).xy;',
'    vec2 normal = vec2( -dir.y, dir.x );',
'    normal.x /= aspect;',
'    normal *= .5 * w;',
'',
'    vec4 offset = vec4( normal * side, 0.0, 1.0 );',
'    finalPosition.xy += offset.xy;',
'',
'    gl_Position = finalPosition;',
'',
'}' ];

	var fragmentShaderSource = [
		'#extension GL_OES_standard_derivatives : enable',
'precision mediump float;',
'',
'uniform sampler2D map;',
'uniform sampler2D alphaMap;',
'uniform float useMap;',
'uniform float useAlphaMap;',
'uniform float useDash;',
'uniform float dashArray;',
'uniform float dashOffset;',
'uniform float dashRatio;',
'uniform float visibility;',
'uniform float alphaTest;',
'uniform vec2 repeat;',
'',
'varying vec2 vUV;',
'varying vec4 vColor;',
'varying float vCounters;',
'',
'void main() {',
'',
'    vec4 c = vColor;',
'    if( useMap == 1. ) c *= texture2D( map, vUV * repeat );',
'    if( useAlphaMap == 1. ) c.a *= texture2D( alphaMap, vUV * repeat ).a;',
'    if( c.a < alphaTest ) discard;',
'    if( useDash == 1. ){',
'        c.a *= ceil(mod(vCounters + dashOffset, dashArray) - (dashArray * dashRatio));',
'    }',
'    gl_FragColor = c;',
'    gl_FragColor.a *= step(vCounters, visibility);',
'}' ];

	function check( v, d ) {
		if( v === undefined ) return d;
		return v;
	}

	THREE.Material.call( this );

	parameters = parameters || {};

	this.lineWidth = check( parameters.lineWidth, 1 );
	this.map = check( parameters.map, null );
	this.useMap = check( parameters.useMap, 0 );
	this.alphaMap = check( parameters.alphaMap, null );
	this.useAlphaMap = check( parameters.useAlphaMap, 0 );
	this.color = check( parameters.color, new THREE.Color( 0xffffff ) );
	this.opacity = check( parameters.opacity, 1 );
	this.resolution = check( parameters.resolution, new THREE.Vector2( 1, 1 ) );
	this.sizeAttenuation = check( parameters.sizeAttenuation, 1 );
	this.near = check( parameters.near, 1 );
	this.far = check( parameters.far, 1 );
	this.dashArray = check( parameters.dashArray, 0 );
	this.dashOffset = check( parameters.dashOffset, 0 );
	this.dashRatio = check( parameters.dashRatio, 0.5 );
	this.useDash = ( this.dashArray !== 0 ) ? 1 : 0;
	this.visibility = check( parameters.visibility, 1 );
	this.alphaTest = check( parameters.alphaTest, 0 );
	this.repeat = check( parameters.repeat, new THREE.Vector2( 1, 1 ) );

	var material = new THREE.RawShaderMaterial( {
		uniforms:{
			lineWidth: { type: 'f', value: this.lineWidth },
			map: { type: 't', value: this.map },
			useMap: { type: 'f', value: this.useMap },
			alphaMap: { type: 't', value: this.alphaMap },
			useAlphaMap: { type: 'f', value: this.useAlphaMap },
			color: { type: 'c', value: this.color },
			opacity: { type: 'f', value: this.opacity },
			resolution: { type: 'v2', value: this.resolution },
			sizeAttenuation: { type: 'f', value: this.sizeAttenuation },
			near: { type: 'f', value: this.near },
			far: { type: 'f', value: this.far },
			dashArray: { type: 'f', value: this.dashArray },
			dashOffset: { type: 'f', value: this.dashOffset },
			dashRatio: { type: 'f', value: this.dashRatio },
			useDash: { type: 'f', value: this.useDash },
			visibility: {type: 'f', value: this.visibility},
			alphaTest: {type: 'f', value: this.alphaTest},
			repeat: { type: 'v2', value: this.repeat }
		},
		vertexShader: vertexShaderSource.join( '\r\n' ),
		fragmentShader: fragmentShaderSource.join( '\r\n' )
	});

	delete parameters.lineWidth;
	delete parameters.map;
	delete parameters.useMap;
	delete parameters.alphaMap;
	delete parameters.useAlphaMap;
	delete parameters.color;
	delete parameters.opacity;
	delete parameters.resolution;
	delete parameters.sizeAttenuation;
	delete parameters.near;
	delete parameters.far;
	delete parameters.dashArray;
	delete parameters.dashOffset;
	delete parameters.dashRatio;
	delete parameters.visibility;
	delete parameters.alphaTest;
	delete parameters.repeat;

	material.type = 'MeshLineMaterial';

	material.setValues( parameters );

	return material;

};

MeshLineMaterial.prototype = Object.create( THREE.Material.prototype );
MeshLineMaterial.prototype.constructor = MeshLineMaterial;

MeshLineMaterial.prototype.copy = function ( source ) {

	THREE.Material.prototype.copy.call( this, source );

	this.lineWidth = source.lineWidth;
	this.map = source.map;
	this.useMap = source.useMap;
	this.alphaMap = source.alphaMap;
	this.useAlphaMap = source.useAlphaMap;
	this.color.copy( source.color );
	this.opacity = source.opacity;
	this.resolution.copy( source.resolution );
	this.sizeAttenuation = source.sizeAttenuation;
	this.near = source.near;
	this.far = source.far;
	this.dashArray.copy( source.dashArray );
	this.dashOffset.copy( source.dashOffset );
	this.dashRatio.copy( source.dashRatio );
	this.useDash = source.useDash;
	this.visibility = source.visibility;
	this.alphaTest = source.alphaTest;
	this.repeat.copy( source.repeat );

	return this;

};

if( typeof exports !== 'undefined' ) {
	if( typeof module !== 'undefined' && module.exports ) {
		exports = module.exports = { MeshLine: MeshLine, MeshLineMaterial: MeshLineMaterial };
	}
	exports.MeshLine = MeshLine;
	exports.MeshLineMaterial = MeshLineMaterial;
}
else {
	root.MeshLine = MeshLine;
	root.MeshLineMaterial = MeshLineMaterial;
}

}).call(this);