https://github.com/WWBN/AVideo/issues/8713

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

@@ -0,0 +1,414 @@
+/**
+ * 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 = {
+
+	linewidth: { value: 1 },
+	resolution: { value: new THREE.Vector2( 1, 1 ) },
+	dashScale: { value: 1 },
+	dashSize: { value: 1 },
+	dashOffset: { value: 0 },
+	gapSize: { value: 1 }, // todo FIX - maybe change to totalSize
+	opacity: { value: 1 }
+
+};
+
+THREE.ShaderLib[ 'line' ] = {
+
+	uniforms: THREE.UniformsUtils.merge( [
+		THREE.UniformsLib.common,
+		THREE.UniformsLib.fog,
+		THREE.UniformsLib.line
+	] ),
+
+	vertexShader:
+		`
+		#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;
+
+		varying vec2 vUv;
+
+		#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;
+
+			#endif
+
+			float aspect = resolution.x / resolution.y;
+
+			vUv = uv;
+
+			// camera space
+			vec4 start = modelViewMatrix * vec4( instanceStart, 1.0 );
+			vec4 end = modelViewMatrix * vec4( instanceEnd, 1.0 );
+
+			// 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
+			vec2 ndcStart = clipStart.xy / clipStart.w;
+			vec2 ndcEnd = clipEnd.xy / clipEnd.w;
+
+			// direction
+			vec2 dir = ndcEnd - ndcStart;
+
+			// account for clip-space aspect ratio
+			dir.x *= aspect;
+			dir = normalize( dir );
+
+			// perpendicular to dir
+			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;
+
+			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:
+		`
+		uniform vec3 diffuse;
+		uniform float opacity;
+
+		#ifdef USE_DASH
+
+			uniform float dashSize;
+			uniform float dashOffset;
+			uniform float gapSize;
+
+		#endif
+
+		varying float vLineDistance;
+
+		#include <common>
+		#include <color_pars_fragment>
+		#include <fog_pars_fragment>
+		#include <logdepthbuf_pars_fragment>
+		#include <clipping_planes_pars_fragment>
+
+		varying vec2 vUv;
+
+		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
+
+			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;
+
+			}
+
+			vec4 diffuseColor = vec4( diffuse, opacity );
+
+			#include <logdepthbuf_fragment>
+			#include <color_fragment>
+
+			gl_FragColor = vec4( diffuseColor.rgb, diffuseColor.a );
+
+			#include <tonemapping_fragment>
+			#include <encodings_fragment>
+			#include <fog_fragment>
+			#include <premultiplied_alpha_fragment>
+
+		}
+		`
+};
+
+THREE.LineMaterial = function ( parameters ) {
+
+	THREE.ShaderMaterial.call( this, {
+
+		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
+
+	} );
+
+	this.dashed = false;
+
+	Object.defineProperties( this, {
+
+		color: {
+
+			enumerable: true,
+
+			get: function () {
+
+				return this.uniforms.diffuse.value;
+
+			},
+
+			set: function ( value ) {
+
+				this.uniforms.diffuse.value = value;
+
+			}
+
+		},
+
+		linewidth: {
+
+			enumerable: true,
+
+			get: function () {
+
+				return this.uniforms.linewidth.value;
+
+			},
+
+			set: function ( value ) {
+
+				this.uniforms.linewidth.value = value;
+
+			}
+
+		},
+
+		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 );
+
+			}
+
+		}
+
+	} );
+
+	this.setValues( parameters );
+
+};
+
+THREE.LineMaterial.prototype = Object.create( THREE.ShaderMaterial.prototype );
+THREE.LineMaterial.prototype.constructor = THREE.LineMaterial;
+
+THREE.LineMaterial.prototype.isLineMaterial = true;