Initial commit

HTML/ThreeJS/node_modules/three/examples/js/lines/LineMaterial.js

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+( function () {
+
+	/**
+ * parameters = {
+ *  color: <hex>,
+ *  linewidth: <float>,
+ *  dashed: <boolean>,
+ *  dashScale: <float>,
+ *  dashSize: <float>,
+ *  dashOffset: <float>,
+ *  gapSize: <float>,
+ *  resolution: <Vector2>, // to be set by renderer
+ * }
+ */
+	THREE.UniformsLib.line = {
+		worldUnits: {
+			value: 1
+		},
+		linewidth: {
+			value: 1
+		},
+		resolution: {
+			value: new THREE.Vector2( 1, 1 )
+		},
+		dashOffset: {
+			value: 0
+		},
+		dashScale: {
+			value: 1
+		},
+		dashSize: {
+			value: 1
+		},
+		gapSize: {
+			value: 1
+		} // todo FIX - maybe change to totalSize
+
+	};
+	THREE.ShaderLib[ 'line' ] = {
+		uniforms: THREE.UniformsUtils.merge( [ THREE.UniformsLib.common, THREE.UniformsLib.fog, THREE.UniformsLib.line ] ),
+		vertexShader:
+  /* glsl */
+  `
+		#include <common>
+		#include <color_pars_vertex>
+		#include <fog_pars_vertex>
+		#include <logdepthbuf_pars_vertex>
+		#include <clipping_planes_pars_vertex>
+
+		uniform float linewidth;
+		uniform vec2 resolution;
+
+		attribute vec3 instanceStart;
+		attribute vec3 instanceEnd;
+
+		attribute vec3 instanceColorStart;
+		attribute vec3 instanceColorEnd;
+
+		#ifdef WORLD_UNITS
+
+			varying vec4 worldPos;
+			varying vec3 worldStart;
+			varying vec3 worldEnd;
+
+			#ifdef USE_DASH
+
+				varying vec2 vUv;
+
+			#endif
+
+		#else
+
+			varying vec2 vUv;
+
+		#endif
+
+		#ifdef USE_DASH
+
+			uniform float dashScale;
+			attribute float instanceDistanceStart;
+			attribute float instanceDistanceEnd;
+			varying float vLineDistance;
+
+		#endif
+
+		void trimSegment( const in vec4 start, inout vec4 end ) {
+
+			// trim end segment so it terminates between the camera plane and the near plane
+
+			// conservative estimate of the near plane
+			float a = projectionMatrix[ 2 ][ 2 ]; // 3nd entry in 3th column
+			float b = projectionMatrix[ 3 ][ 2 ]; // 3nd entry in 4th column
+			float nearEstimate = - 0.5 * b / a;
+
+			float alpha = ( nearEstimate - start.z ) / ( end.z - start.z );
+
+			end.xyz = mix( start.xyz, end.xyz, alpha );
+
+		}
+
+		void main() {
+
+			#ifdef USE_COLOR
+
+				vColor.xyz = ( position.y < 0.5 ) ? instanceColorStart : instanceColorEnd;
+
+			#endif
+
+			#ifdef USE_DASH
+
+				vLineDistance = ( position.y < 0.5 ) ? dashScale * instanceDistanceStart : dashScale * instanceDistanceEnd;
+				vUv = uv;
+
+			#endif
+
+			float aspect = resolution.x / resolution.y;
+
+			// camera space
+			vec4 start = modelViewMatrix * vec4( instanceStart, 1.0 );
+			vec4 end = modelViewMatrix * vec4( instanceEnd, 1.0 );
+
+			#ifdef WORLD_UNITS
+
+				worldStart = start.xyz;
+				worldEnd = end.xyz;
+
+			#else
+
+				vUv = uv;
+
+			#endif
+
+			// special case for perspective projection, and segments that terminate either in, or behind, the camera plane
+			// clearly the gpu firmware has a way of addressing this issue when projecting into ndc space
+			// but we need to perform ndc-space calculations in the shader, so we must address this issue directly
+			// perhaps there is a more elegant solution -- WestLangley
+
+			bool perspective = ( projectionMatrix[ 2 ][ 3 ] == - 1.0 ); // 4th entry in the 3rd column
+
+			if ( perspective ) {
+
+				if ( start.z < 0.0 && end.z >= 0.0 ) {
+
+					trimSegment( start, end );
+
+				} else if ( end.z < 0.0 && start.z >= 0.0 ) {
+
+					trimSegment( end, start );
+
+				}
+
+			}
+
+			// clip space
+			vec4 clipStart = projectionMatrix * start;
+			vec4 clipEnd = projectionMatrix * end;
+
+			// ndc space
+			vec3 ndcStart = clipStart.xyz / clipStart.w;
+			vec3 ndcEnd = clipEnd.xyz / clipEnd.w;
+
+			// direction
+			vec2 dir = ndcEnd.xy - ndcStart.xy;
+
+			// account for clip-space aspect ratio
+			dir.x *= aspect;
+			dir = normalize( dir );
+
+			#ifdef WORLD_UNITS
+
+				// get the offset direction as perpendicular to the view vector
+				vec3 worldDir = normalize( end.xyz - start.xyz );
+				vec3 offset;
+				if ( position.y < 0.5 ) {
+
+					offset = normalize( cross( start.xyz, worldDir ) );
+
+				} else {
+
+					offset = normalize( cross( end.xyz, worldDir ) );
+
+				}
+
+				// sign flip
+				if ( position.x < 0.0 ) offset *= - 1.0;
+
+				float forwardOffset = dot( worldDir, vec3( 0.0, 0.0, 1.0 ) );
+
+				// don't extend the line if we're rendering dashes because we
+				// won't be rendering the endcaps
+				#ifndef USE_DASH
+
+					// extend the line bounds to encompass  endcaps
+					start.xyz += - worldDir * linewidth * 0.5;
+					end.xyz += worldDir * linewidth * 0.5;
+
+					// shift the position of the quad so it hugs the forward edge of the line
+					offset.xy -= dir * forwardOffset;
+					offset.z += 0.5;
+
+				#endif
+
+				// endcaps
+				if ( position.y > 1.0 || position.y < 0.0 ) {
+
+					offset.xy += dir * 2.0 * forwardOffset;
+
+				}
+
+				// adjust for linewidth
+				offset *= linewidth * 0.5;
+
+				// set the world position
+				worldPos = ( position.y < 0.5 ) ? start : end;
+				worldPos.xyz += offset;
+
+				// project the worldpos
+				vec4 clip = projectionMatrix * worldPos;
+
+				// shift the depth of the projected points so the line
+				// segements overlap neatly
+				vec3 clipPose = ( position.y < 0.5 ) ? ndcStart : ndcEnd;
+				clip.z = clipPose.z * clip.w;
+
+			#else
+
+				vec2 offset = vec2( dir.y, - dir.x );
+				// undo aspect ratio adjustment
+				dir.x /= aspect;
+				offset.x /= aspect;
+
+				// sign flip
+				if ( position.x < 0.0 ) offset *= - 1.0;
+
+				// endcaps
+				if ( position.y < 0.0 ) {
+
+					offset += - dir;
+
+				} else if ( position.y > 1.0 ) {
+
+					offset += dir;
+
+				}
+
+				// adjust for linewidth
+				offset *= linewidth;
+
+				// adjust for clip-space to screen-space conversion // maybe resolution should be based on viewport ...
+				offset /= resolution.y;
+
+				// select end
+				vec4 clip = ( position.y < 0.5 ) ? clipStart : clipEnd;
+
+				// back to clip space
+				offset *= clip.w;
+
+				clip.xy += offset;
+
+			#endif
+
+			gl_Position = clip;
+
+			vec4 mvPosition = ( position.y < 0.5 ) ? start : end; // this is an approximation
+
+			#include <logdepthbuf_vertex>
+			#include <clipping_planes_vertex>
+			#include <fog_vertex>
+
+		}
+		`,
+		fragmentShader:
+  /* glsl */
+  `
+		uniform vec3 diffuse;
+		uniform float opacity;
+		uniform float linewidth;
+
+		#ifdef USE_DASH
+
+			uniform float dashOffset;
+			uniform float dashSize;
+			uniform float gapSize;
+
+		#endif
+
+		varying float vLineDistance;
+
+		#ifdef WORLD_UNITS
+
+			varying vec4 worldPos;
+			varying vec3 worldStart;
+			varying vec3 worldEnd;
+
+			#ifdef USE_DASH
+
+				varying vec2 vUv;
+
+			#endif
+
+		#else
+
+			varying vec2 vUv;
+
+		#endif
+
+		#include <common>
+		#include <color_pars_fragment>
+		#include <fog_pars_fragment>
+		#include <logdepthbuf_pars_fragment>
+		#include <clipping_planes_pars_fragment>
+
+		vec2 closestLineToLine(vec3 p1, vec3 p2, vec3 p3, vec3 p4) {
+
+			float mua;
+			float mub;
+
+			vec3 p13 = p1 - p3;
+			vec3 p43 = p4 - p3;
+
+			vec3 p21 = p2 - p1;
+
+			float d1343 = dot( p13, p43 );
+			float d4321 = dot( p43, p21 );
+			float d1321 = dot( p13, p21 );
+			float d4343 = dot( p43, p43 );
+			float d2121 = dot( p21, p21 );
+
+			float denom = d2121 * d4343 - d4321 * d4321;
+
+			float numer = d1343 * d4321 - d1321 * d4343;
+
+			mua = numer / denom;
+			mua = clamp( mua, 0.0, 1.0 );
+			mub = ( d1343 + d4321 * ( mua ) ) / d4343;
+			mub = clamp( mub, 0.0, 1.0 );
+
+			return vec2( mua, mub );
+
+		}
+
+		void main() {
+
+			#include <clipping_planes_fragment>
+
+			#ifdef USE_DASH
+
+				if ( vUv.y < - 1.0 || vUv.y > 1.0 ) discard; // discard endcaps
+
+				if ( mod( vLineDistance + dashOffset, dashSize + gapSize ) > dashSize ) discard; // todo - FIX
+
+			#endif
+
+			float alpha = opacity;
+
+			#ifdef WORLD_UNITS
+
+				// Find the closest points on the view ray and the line segment
+				vec3 rayEnd = normalize( worldPos.xyz ) * 1e5;
+				vec3 lineDir = worldEnd - worldStart;
+				vec2 params = closestLineToLine( worldStart, worldEnd, vec3( 0.0, 0.0, 0.0 ), rayEnd );
+
+				vec3 p1 = worldStart + lineDir * params.x;
+				vec3 p2 = rayEnd * params.y;
+				vec3 delta = p1 - p2;
+				float len = length( delta );
+				float norm = len / linewidth;
+
+				#ifndef USE_DASH
+
+					#ifdef USE_ALPHA_TO_COVERAGE
+
+						float dnorm = fwidth( norm );
+						alpha = 1.0 - smoothstep( 0.5 - dnorm, 0.5 + dnorm, norm );
+
+					#else
+
+						if ( norm > 0.5 ) {
+
+							discard;
+
+						}
+
+					#endif
+
+				#endif
+
+			#else
+
+				#ifdef USE_ALPHA_TO_COVERAGE
+
+					// artifacts appear on some hardware if a derivative is taken within a conditional
+					float a = vUv.x;
+					float b = ( vUv.y > 0.0 ) ? vUv.y - 1.0 : vUv.y + 1.0;
+					float len2 = a * a + b * b;
+					float dlen = fwidth( len2 );
+
+					if ( abs( vUv.y ) > 1.0 ) {
+
+						alpha = 1.0 - smoothstep( 1.0 - dlen, 1.0 + dlen, len2 );
+
+					}
+
+				#else
+
+					if ( abs( vUv.y ) > 1.0 ) {
+
+						float a = vUv.x;
+						float b = ( vUv.y > 0.0 ) ? vUv.y - 1.0 : vUv.y + 1.0;
+						float len2 = a * a + b * b;
+
+						if ( len2 > 1.0 ) discard;
+
+					}
+
+				#endif
+
+			#endif
+
+			vec4 diffuseColor = vec4( diffuse, alpha );
+
+			#include <logdepthbuf_fragment>
+			#include <color_fragment>
+
+			gl_FragColor = vec4( diffuseColor.rgb, alpha );
+
+			#include <tonemapping_fragment>
+			#include <encodings_fragment>
+			#include <fog_fragment>
+			#include <premultiplied_alpha_fragment>
+
+		}
+		`
+	};
+
+	class LineMaterial extends THREE.ShaderMaterial {
+
+		constructor( parameters ) {
+
+			super( {
+				type: 'LineMaterial',
+				uniforms: THREE.UniformsUtils.clone( THREE.ShaderLib[ 'line' ].uniforms ),
+				vertexShader: THREE.ShaderLib[ 'line' ].vertexShader,
+				fragmentShader: THREE.ShaderLib[ 'line' ].fragmentShader,
+				clipping: true // required for clipping support
+
+			} );
+			Object.defineProperties( this, {
+				color: {
+					enumerable: true,
+					get: function () {
+
+						return this.uniforms.diffuse.value;
+
+					},
+					set: function ( value ) {
+
+						this.uniforms.diffuse.value = value;
+
+					}
+				},
+				worldUnits: {
+					enumerable: true,
+					get: function () {
+
+						return 'WORLD_UNITS' in this.defines;
+
+					},
+					set: function ( value ) {
+
+						if ( value === true ) {
+
+							this.defines.WORLD_UNITS = '';
+
+						} else {
+
+							delete this.defines.WORLD_UNITS;
+
+						}
+
+					}
+				},
+				linewidth: {
+					enumerable: true,
+					get: function () {
+
+						return this.uniforms.linewidth.value;
+
+					},
+					set: function ( value ) {
+
+						this.uniforms.linewidth.value = value;
+
+					}
+				},
+				dashed: {
+					enumerable: true,
+					get: function () {
+
+						return Boolean( 'USE_DASH' in this.defines );
+
+					},
+
+					set( value ) {
+
+						if ( Boolean( value ) !== Boolean( 'USE_DASH' in this.defines ) ) {
+
+							this.needsUpdate = true;
+
+						}
+
+						if ( value === true ) {
+
+							this.defines.USE_DASH = '';
+
+						} else {
+
+							delete this.defines.USE_DASH;
+
+						}
+
+					}
+
+				},
+				dashScale: {
+					enumerable: true,
+					get: function () {
+
+						return this.uniforms.dashScale.value;
+
+					},
+					set: function ( value ) {
+
+						this.uniforms.dashScale.value = value;
+
+					}
+				},
+				dashSize: {
+					enumerable: true,
+					get: function () {
+
+						return this.uniforms.dashSize.value;
+
+					},
+					set: function ( value ) {
+
+						this.uniforms.dashSize.value = value;
+
+					}
+				},
+				dashOffset: {
+					enumerable: true,
+					get: function () {
+
+						return this.uniforms.dashOffset.value;
+
+					},
+					set: function ( value ) {
+
+						this.uniforms.dashOffset.value = value;
+
+					}
+				},
+				gapSize: {
+					enumerable: true,
+					get: function () {
+
+						return this.uniforms.gapSize.value;
+
+					},
+					set: function ( value ) {
+
+						this.uniforms.gapSize.value = value;
+
+					}
+				},
+				opacity: {
+					enumerable: true,
+					get: function () {
+
+						return this.uniforms.opacity.value;
+
+					},
+					set: function ( value ) {
+
+						this.uniforms.opacity.value = value;
+
+					}
+				},
+				resolution: {
+					enumerable: true,
+					get: function () {
+
+						return this.uniforms.resolution.value;
+
+					},
+					set: function ( value ) {
+
+						this.uniforms.resolution.value.copy( value );
+
+					}
+				},
+				alphaToCoverage: {
+					enumerable: true,
+					get: function () {
+
+						return Boolean( 'USE_ALPHA_TO_COVERAGE' in this.defines );
+
+					},
+					set: function ( value ) {
+
+						if ( Boolean( value ) !== Boolean( 'USE_ALPHA_TO_COVERAGE' in this.defines ) ) {
+
+							this.needsUpdate = true;
+
+						}
+
+						if ( value === true ) {
+
+							this.defines.USE_ALPHA_TO_COVERAGE = '';
+							this.extensions.derivatives = true;
+
+						} else {
+
+							delete this.defines.USE_ALPHA_TO_COVERAGE;
+							this.extensions.derivatives = false;
+
+						}
+
+					}
+				}
+			} );
+			this.setValues( parameters );
+
+		}
+
+	}
+
+	LineMaterial.prototype.isLineMaterial = true;
+
+	THREE.LineMaterial = LineMaterial;
+
+} )();