three.js/examples/jsm/utils/GeometryCompressionUtils.js

/**
 * @author LeonYuanYao / https://github.com/LeonYuanYao
 *
 * Octahedron and Quantization encodings based on work by:
 * @auther Tarek Sherif @tsherif
 * @link https://github.com/tsherif/mesh-quantization-example
 *
 */

import {
	BufferAttribute,
	Matrix3,
	Matrix4,
	MeshPhongMaterial,
	ShaderChunk,
	ShaderLib,
	UniformsUtils,
	Vector3
} from "../../../build/three.module.js";

var GeometryCompressionUtils = {

	/**
		 * Make the input mesh.geometry's normal attribute encoded and compressed by 3 different methods.
		 * Also will change the mesh.material to `PackedPhongMaterial` which let the vertex shader program decode the normal data.
		 *
		 * @param {THREE.Mesh} mesh
		 * @param {String} encodeMethod		"DEFAULT" || "OCT1Byte" || "OCT2Byte" || "ANGLES"
		 *
		 */
	compressNormals: function (mesh, encodeMethod) {

		if (!mesh.geometry) {

			console.error("Mesh must contain geometry. ");

		}

		let normal = mesh.geometry.attributes.normal;

		if (!normal) {

			console.error("Geometry must contain normal attribute. ");

		}

		if (normal.isPacked) return;

		if (normal.itemSize != 3) {

			console.error("normal.itemSize is not 3, which cannot be encoded. ");

		}

		let array = normal.array;
		let count = normal.count;

		let result;
		if (encodeMethod == "DEFAULT") {

			result = new Uint8Array(count * 3);

			for (let idx = 0; idx < array.length; idx += 3) {

				let encoded;

				encoded = this.EncodingFuncs.defaultEncode(array[idx], array[idx + 1], array[idx + 2], 1);

				result[idx + 0] = encoded[0];
				result[idx + 1] = encoded[1];
				result[idx + 2] = encoded[2];

			}

			mesh.geometry.setAttribute('normal', new BufferAttribute(result, 3, true));
			mesh.geometry.attributes.normal.bytes = result.length * 1;

		} else if (encodeMethod == "OCT1Byte") {

			/**
			* It is not recommended to use 1-byte octahedron normals encoding unless you want to extremely reduce the memory usage
			* As it makes vertex data not aligned to a 4 byte boundary which may harm some WebGL implementations and sometimes the normal distortion is visible
			* Please refer to @zeux 's comments in https://github.com/mrdoob/three.js/pull/18208
			*/

			result = new Int8Array(count * 2);

			for (let idx = 0; idx < array.length; idx += 3) {

				let encoded;

				encoded = this.EncodingFuncs.octEncodeBest(array[idx], array[idx + 1], array[idx + 2], 1);

				result[idx / 3 * 2 + 0] = encoded[0];
				result[idx / 3 * 2 + 1] = encoded[1];

			}

			mesh.geometry.setAttribute('normal', new BufferAttribute(result, 2, true));
			mesh.geometry.attributes.normal.bytes = result.length * 1;

		} else if (encodeMethod == "OCT2Byte") {

			result = new Int16Array(count * 2);

			for (let idx = 0; idx < array.length; idx += 3) {

				let encoded;

				encoded = this.EncodingFuncs.octEncodeBest(array[idx], array[idx + 1], array[idx + 2], 2);

				result[idx / 3 * 2 + 0] = encoded[0];
				result[idx / 3 * 2 + 1] = encoded[1];

			}

			mesh.geometry.setAttribute('normal', new BufferAttribute(result, 2, true));
			mesh.geometry.attributes.normal.bytes = result.length * 2;

		} else if (encodeMethod == "ANGLES") {

			result = new Uint16Array(count * 2);

			for (let idx = 0; idx < array.length; idx += 3) {

				let encoded;

				encoded = this.EncodingFuncs.anglesEncode(array[idx], array[idx + 1], array[idx + 2]);

				result[idx / 3 * 2 + 0] = encoded[0];
				result[idx / 3 * 2 + 1] = encoded[1];

			}

			mesh.geometry.setAttribute('normal', new BufferAttribute(result, 2, true));
			mesh.geometry.attributes.normal.bytes = result.length * 2;

		} else {

			console.error("Unrecognized encoding method, should be `DEFAULT` or `ANGLES` or `OCT`. ");

		}

		mesh.geometry.attributes.normal.needsUpdate = true;
		mesh.geometry.attributes.normal.isPacked = true;
		mesh.geometry.attributes.normal.packingMethod = encodeMethod;

		// modify material
		if (!(mesh.material instanceof PackedPhongMaterial)) {

			mesh.material = new PackedPhongMaterial().copy(mesh.material);

		}

		if (encodeMethod == "ANGLES") {

			mesh.material.defines.USE_PACKED_NORMAL = 0;

		}
		if (encodeMethod == "OCT1Byte") {

			mesh.material.defines.USE_PACKED_NORMAL = 1;

		}
		if (encodeMethod == "OCT2Byte") {

			mesh.material.defines.USE_PACKED_NORMAL = 1;

		}
		if (encodeMethod == "DEFAULT") {

			mesh.material.defines.USE_PACKED_NORMAL = 2;

		}

	},


	/**
		 * Make the input mesh.geometry's position attribute encoded and compressed.
		 * Also will change the mesh.material to `PackedPhongMaterial` which let the vertex shader program decode the position data.
		 *
		 * @param {THREE.Mesh} mesh
		 *
		 */
	compressPositions: function (mesh) {

		if (!mesh.geometry) {

			console.error("Mesh must contain geometry. ");

		}

		let position = mesh.geometry.attributes.position;

		if (!position) {

			console.error("Geometry must contain position attribute. ");

		}

		if (position.isPacked) return;

		if (position.itemSize != 3) {

			console.error("position.itemSize is not 3, which cannot be packed. ");

		}

		let array = position.array;
		let encodingBytes = 2;

		let result = this.EncodingFuncs.quantizedEncode(array, encodingBytes);

		let quantized = result.quantized;
		let decodeMat = result.decodeMat;

		// IMPORTANT: calculate original geometry bounding info first, before updating packed positions
		if (mesh.geometry.boundingBox == null) mesh.geometry.computeBoundingBox();
		if (mesh.geometry.boundingSphere == null) mesh.geometry.computeBoundingSphere();

		mesh.geometry.setAttribute('position', new BufferAttribute(quantized, 3));
		mesh.geometry.attributes.position.isPacked = true;
		mesh.geometry.attributes.position.needsUpdate = true;
		mesh.geometry.attributes.position.bytes = quantized.length * encodingBytes;

		// modify material
		if (!(mesh.material instanceof PackedPhongMaterial)) {

			mesh.material = new PackedPhongMaterial().copy(mesh.material);

		}

		mesh.material.defines.USE_PACKED_POSITION = 0;

		mesh.material.uniforms.quantizeMatPos.value = decodeMat;
		mesh.material.uniforms.quantizeMatPos.needsUpdate = true;

	},

	/**
		 * Make the input mesh.geometry's uv attribute encoded and compressed.
		 * Also will change the mesh.material to `PackedPhongMaterial` which let the vertex shader program decode the uv data.
		 *
		 * @param {THREE.Mesh} mesh
		 *
		 */
	compressUvs: function (mesh) {

		if (!mesh.geometry) {

			console.error("Mesh must contain geometry property. ");

		}

		let uvs = mesh.geometry.attributes.uv;

		if (!uvs) {

			console.error("Geometry must contain uv attribute. ");

		}

		if (uvs.isPacked) return;

		let range = { min: Infinity, max: - Infinity };

		let array = uvs.array;

		for (let i = 0; i < array.length; i++) {

			range.min = Math.min(range.min, array[i]);
			range.max = Math.max(range.max, array[i]);

		}

		let result;

		if (range.min >= - 1.0 && range.max <= 1.0) {

			// use default encoding method
			result = new Uint16Array(array.length);

			for (let i = 0; i < array.length; i += 2) {

				let encoded = this.EncodingFuncs.defaultEncode(array[i], array[i + 1], 0, 2);

				result[i] = encoded[0];
				result[i + 1] = encoded[1];

			}

			mesh.geometry.setAttribute('uv', new BufferAttribute(result, 2, true));
			mesh.geometry.attributes.uv.isPacked = true;
			mesh.geometry.attributes.uv.needsUpdate = true;
			mesh.geometry.attributes.uv.bytes = result.length * 2;

			if (!(mesh.material instanceof PackedPhongMaterial)) {

				mesh.material = new PackedPhongMaterial().copy(mesh.material);

			}

			mesh.material.defines.USE_PACKED_UV = 0;

		} else {

			// use quantized encoding method
			result = this.EncodingFuncs.quantizedEncodeUV(array, 2);

			mesh.geometry.setAttribute('uv', new BufferAttribute(result.quantized, 2));
			mesh.geometry.attributes.uv.isPacked = true;
			mesh.geometry.attributes.uv.needsUpdate = true;
			mesh.geometry.attributes.uv.bytes = result.quantized.length * 2;

			if (!(mesh.material instanceof PackedPhongMaterial)) {

				mesh.material = new PackedPhongMaterial().copy(mesh.material);

			}

			mesh.material.defines.USE_PACKED_UV = 1;

			mesh.material.uniforms.quantizeMatUV.value = result.decodeMat;
			mesh.material.uniforms.quantizeMatUV.needsUpdate = true;

		}




	},


	EncodingFuncs: {

		defaultEncode: function (x, y, z, bytes) {

			if (bytes == 1) {

				let tmpx = Math.round((x + 1) * 0.5 * 255);
				let tmpy = Math.round((y + 1) * 0.5 * 255);
				let tmpz = Math.round((z + 1) * 0.5 * 255);
				return new Uint8Array([tmpx, tmpy, tmpz]);

			} else if (bytes == 2) {

				let tmpx = Math.round((x + 1) * 0.5 * 65535);
				let tmpy = Math.round((y + 1) * 0.5 * 65535);
				let tmpz = Math.round((z + 1) * 0.5 * 65535);
				return new Uint16Array([tmpx, tmpy, tmpz]);

			} else {

				console.error("number of bytes must be 1 or 2");

			}

		},

		defaultDecode: function (array, bytes) {

			if (bytes == 1) {

				return [
					((array[0] / 255) * 2.0) - 1.0,
					((array[1] / 255) * 2.0) - 1.0,
					((array[2] / 255) * 2.0) - 1.0,
				];

			} else if (bytes == 2) {

				return [
					((array[0] / 65535) * 2.0) - 1.0,
					((array[1] / 65535) * 2.0) - 1.0,
					((array[2] / 65535) * 2.0) - 1.0,
				];

			} else {

				console.error("number of bytes must be 1 or 2");

			}

		},

		// for `Angles` encoding
		anglesEncode: function (x, y, z) {

			let normal0 = parseInt(0.5 * (1.0 + Math.atan2(y, x) / Math.PI) * 65535);
			let normal1 = parseInt(0.5 * (1.0 + z) * 65535);
			return new Uint16Array([normal0, normal1]);

		},

		// for `Octahedron` encoding
		octEncodeBest: function (x, y, z, bytes) {

			var oct, dec, best, currentCos, bestCos;

			// Test various combinations of ceil and floor
			// to minimize rounding errors
			best = oct = octEncodeVec3(x, y, z, "floor", "floor");
			dec = octDecodeVec2(oct);
			currentCos = bestCos = dot(x, y, z, dec);

			oct = octEncodeVec3(x, y, z, "ceil", "floor");
			dec = octDecodeVec2(oct);
			currentCos = dot(x, y, z, dec);

			if (currentCos > bestCos) {

				best = oct;
				bestCos = currentCos;

			}

			oct = octEncodeVec3(x, y, z, "floor", "ceil");
			dec = octDecodeVec2(oct);
			currentCos = dot(x, y, z, dec);

			if (currentCos > bestCos) {

				best = oct;
				bestCos = currentCos;

			}

			oct = octEncodeVec3(x, y, z, "ceil", "ceil");
			dec = octDecodeVec2(oct);
			currentCos = dot(x, y, z, dec);

			if (currentCos > bestCos) {

				best = oct;

			}

			return best;

			function octEncodeVec3(x0, y0, z0, xfunc, yfunc) {

				var x = x0 / (Math.abs(x0) + Math.abs(y0) + Math.abs(z0));
				var y = y0 / (Math.abs(x0) + Math.abs(y0) + Math.abs(z0));

				if (z < 0) {

					var tempx = tempx = (1 - Math.abs(y)) * (x >= 0 ? 1 : - 1);
					var tempy = tempy = (1 - Math.abs(x)) * (y >= 0 ? 1 : - 1);

					x = tempx;
					y = tempy;

					var diff = 1 - Math.abs(x) - Math.abs(y);
					if (diff > 0) {

						diff += 0.001;
						x += x > 0 ? diff / 2 : - diff / 2;
						y += y > 0 ? diff / 2 : - diff / 2;

					}

				}

				if (bytes == 1) {

					return new Int8Array([
						Math[xfunc](x * 127.5 + (x < 0 ? 1 : 0)),
						Math[yfunc](y * 127.5 + (y < 0 ? 1 : 0))
					]);

				}
				if (bytes == 2) {

					return new Int16Array([
						Math[xfunc](x * 32767.5 + (x < 0 ? 1 : 0)),
						Math[yfunc](y * 32767.5 + (y < 0 ? 1 : 0))
					]);

				}


			}

			function octDecodeVec2(oct) {

				var x = oct[0];
				var y = oct[1];

				if (bytes == 1) {

					x /= x < 0 ? 127 : 128;
					y /= y < 0 ? 127 : 128;

				} else if (bytes == 2) {

					x /= x < 0 ? 32767 : 32768;
					y /= y < 0 ? 32767 : 32768;

				}


				var z = 1 - Math.abs(x) - Math.abs(y);

				if (z < 0) {

					var tmpx = x;
					x = (1 - Math.abs(y)) * (x >= 0 ? 1 : - 1);
					y = (1 - Math.abs(tmpx)) * (y >= 0 ? 1 : - 1);

				}

				var length = Math.sqrt(x * x + y * y + z * z);

				return [
					x / length,
					y / length,
					z / length
				];

			}

			function dot(x, y, z, vec3) {

				return x * vec3[0] + y * vec3[1] + z * vec3[2];

			}

		},

		quantizedEncode: function (array, bytes) {

			let quantized, segments;

			if (bytes == 1) {

				quantized = new Uint8Array(array.length);
				segments = 255;

			} else if (bytes == 2) {

				quantized = new Uint16Array(array.length);
				segments = 65535;

			} else {

				console.error("number of bytes error! ");

			}

			let decodeMat = new Matrix4();

			let min = new Float32Array(3);
			let max = new Float32Array(3);

			min[0] = min[1] = min[2] = Number.MAX_VALUE;
			max[0] = max[1] = max[2] = - Number.MAX_VALUE;

			for (let i = 0; i < array.length; i += 3) {

				min[0] = Math.min(min[0], array[i + 0]);
				min[1] = Math.min(min[1], array[i + 1]);
				min[2] = Math.min(min[2], array[i + 2]);
				max[0] = Math.max(max[0], array[i + 0]);
				max[1] = Math.max(max[1], array[i + 1]);
				max[2] = Math.max(max[2], array[i + 2]);

			}

			decodeMat.scale(new Vector3(
				(max[0] - min[0]) / segments,
				(max[1] - min[1]) / segments,
				(max[2] - min[2]) / segments
			));

			decodeMat.elements[12] = min[0];
			decodeMat.elements[13] = min[1];
			decodeMat.elements[14] = min[2];

			decodeMat.transpose();


			let multiplier = new Float32Array([
				max[0] !== min[0] ? segments / (max[0] - min[0]) : 0,
				max[1] !== min[1] ? segments / (max[1] - min[1]) : 0,
				max[2] !== min[2] ? segments / (max[2] - min[2]) : 0
			]);

			for (let i = 0; i < array.length; i += 3) {

				quantized[i + 0] = Math.floor((array[i + 0] - min[0]) * multiplier[0]);
				quantized[i + 1] = Math.floor((array[i + 1] - min[1]) * multiplier[1]);
				quantized[i + 2] = Math.floor((array[i + 2] - min[2]) * multiplier[2]);

			}

			return {
				quantized: quantized,
				decodeMat: decodeMat
			};

		},


		quantizedEncodeUV: function (array, bytes) {

			let quantized, segments;

			if (bytes == 1) {

				quantized = new Uint8Array(array.length);
				segments = 255;

			} else if (bytes == 2) {

				quantized = new Uint16Array(array.length);
				segments = 65535;

			} else {

				console.error("number of bytes error! ");

			}

			let decodeMat = new Matrix3();

			let min = new Float32Array(2);
			let max = new Float32Array(2);

			min[0] = min[1] = Number.MAX_VALUE;
			max[0] = max[1] = - Number.MAX_VALUE;

			for (let i = 0; i < array.length; i += 2) {

				min[0] = Math.min(min[0], array[i + 0]);
				min[1] = Math.min(min[1], array[i + 1]);
				max[0] = Math.max(max[0], array[i + 0]);
				max[1] = Math.max(max[1], array[i + 1]);

			}

			decodeMat.scale(
				(max[0] - min[0]) / segments,
				(max[1] - min[1]) / segments
			);

			decodeMat.elements[6] = min[0];
			decodeMat.elements[7] = min[1];

			decodeMat.transpose();

			let multiplier = new Float32Array([
				max[0] !== min[0] ? segments / (max[0] - min[0]) : 0,
				max[1] !== min[1] ? segments / (max[1] - min[1]) : 0
			]);

			for (let i = 0; i < array.length; i += 2) {

				quantized[i + 0] = Math.floor((array[i + 0] - min[0]) * multiplier[0]);
				quantized[i + 1] = Math.floor((array[i + 1] - min[1]) * multiplier[1]);

			}

			return {
				quantized: quantized,
				decodeMat: decodeMat
			};

		}

	}

};



/**
 * `PackedPhongMaterial` inherited from THREE.MeshPhongMaterial
 *
 * @param {Object} parameters
 */
function PackedPhongMaterial(parameters) {

	MeshPhongMaterial.call(this);
	this.defines = {};
	this.type = 'PackedPhongMaterial';
	this.uniforms = UniformsUtils.merge([

		ShaderLib.phong.uniforms,

		{
			quantizeMatPos: { value: null },
			quantizeMatUV: { value: null }
		}

	]);

	this.vertexShader = [
		"#define PHONG",

		"varying vec3 vViewPosition;",

		"#ifndef FLAT_SHADED",
		"varying vec3 vNormal;",
		"#endif",

		ShaderChunk.common,
		ShaderChunk.uv_pars_vertex,
		ShaderChunk.uv2_pars_vertex,
		ShaderChunk.displacementmap_pars_vertex,
		ShaderChunk.envmap_pars_vertex,
		ShaderChunk.color_pars_vertex,
		ShaderChunk.fog_pars_vertex,
		ShaderChunk.morphtarget_pars_vertex,
		ShaderChunk.skinning_pars_vertex,
		ShaderChunk.shadowmap_pars_vertex,
		ShaderChunk.logdepthbuf_pars_vertex,
		ShaderChunk.clipping_planes_pars_vertex,

		`#ifdef USE_PACKED_NORMAL
			#if USE_PACKED_NORMAL == 0
				vec3 decodeNormal(vec3 packedNormal)
				{
					float x = packedNormal.x * 2.0 - 1.0;
					float y = packedNormal.y * 2.0 - 1.0;
					vec2 scth = vec2(sin(x * PI), cos(x * PI));
					vec2 scphi = vec2(sqrt(1.0 - y * y), y);
					return normalize( vec3(scth.y * scphi.x, scth.x * scphi.x, scphi.y) );
				}
			#endif

			#if USE_PACKED_NORMAL == 1
				vec3 decodeNormal(vec3 packedNormal)
				{
					vec3 v = vec3(packedNormal.xy, 1.0 - abs(packedNormal.x) - abs(packedNormal.y));
					if (v.z < 0.0)
					{
						v.xy = (1.0 - abs(v.yx)) * vec2((v.x >= 0.0) ? +1.0 : -1.0, (v.y >= 0.0) ? +1.0 : -1.0);
					}
					return normalize(v);
				}
			#endif

			#if USE_PACKED_NORMAL == 2
				vec3 decodeNormal(vec3 packedNormal)
				{
					vec3 v = (packedNormal * 2.0) - 1.0;
					return normalize(v);
				}
			#endif
		#endif`,

		`#ifdef USE_PACKED_POSITION
			#if USE_PACKED_POSITION == 0
				uniform mat4 quantizeMatPos;
			#endif
		#endif`,

		`#ifdef USE_PACKED_UV
			#if USE_PACKED_UV == 1
				uniform mat3 quantizeMatUV;
			#endif
		#endif`,

		`#ifdef USE_PACKED_UV
			#if USE_PACKED_UV == 0
				vec2 decodeUV(vec2 packedUV)
				{
					vec2 uv = (packedUV * 2.0) - 1.0;
					return uv;
				}
			#endif

			#if USE_PACKED_UV == 1
				vec2 decodeUV(vec2 packedUV)
				{
					vec2 uv = ( vec3(packedUV, 1.0) * quantizeMatUV ).xy;
					return uv;
				}
			#endif
		#endif`,

		"void main() {",

		ShaderChunk.uv_vertex,

		`#ifdef USE_UV
			#ifdef USE_PACKED_UV
				vUv = decodeUV(vUv);
			#endif
		#endif`,

		ShaderChunk.uv2_vertex,
		ShaderChunk.color_vertex,
		ShaderChunk.beginnormal_vertex,

		`#ifdef USE_PACKED_NORMAL
			objectNormal = decodeNormal(objectNormal);
		#endif

		#ifdef USE_TANGENT
			vec3 objectTangent = vec3( tangent.xyz );
		#endif
		`,

		ShaderChunk.morphnormal_vertex,
		ShaderChunk.skinbase_vertex,
		ShaderChunk.skinnormal_vertex,
		ShaderChunk.defaultnormal_vertex,

		"#ifndef FLAT_SHADED",
		"	vNormal = normalize( transformedNormal );",
		"#endif",

		ShaderChunk.begin_vertex,

		`#ifdef USE_PACKED_POSITION
			#if USE_PACKED_POSITION == 0
				transformed = ( vec4(transformed, 1.0) * quantizeMatPos ).xyz;
			#endif
		#endif`,

		ShaderChunk.morphtarget_vertex,
		ShaderChunk.skinning_vertex,
		ShaderChunk.displacementmap_vertex,
		ShaderChunk.project_vertex,
		ShaderChunk.logdepthbuf_vertex,
		ShaderChunk.clipping_planes_vertex,

		"vViewPosition = - mvPosition.xyz;",

		ShaderChunk.worldpos_vertex,
		ShaderChunk.envmap_vertex,
		ShaderChunk.shadowmap_vertex,
		ShaderChunk.fog_vertex,

		"}",
	].join("\n");

	this.fragmentShader = [
		"#define PHONG",

		"uniform vec3 diffuse;",
		"uniform vec3 emissive;",
		"uniform vec3 specular;",
		"uniform float shininess;",
		"uniform float opacity;",

		ShaderChunk.common,
		ShaderChunk.packing,
		ShaderChunk.dithering_pars_fragment,
		ShaderChunk.color_pars_fragment,
		ShaderChunk.uv_pars_fragment,
		ShaderChunk.uv2_pars_fragment,
		ShaderChunk.map_pars_fragment,
		ShaderChunk.alphamap_pars_fragment,
		ShaderChunk.aomap_pars_fragment,
		ShaderChunk.lightmap_pars_fragment,
		ShaderChunk.emissivemap_pars_fragment,
		ShaderChunk.envmap_common_pars_fragment,
		ShaderChunk.envmap_pars_fragment,
		ShaderChunk.cube_uv_reflection_fragment,
		ShaderChunk.fog_pars_fragment,
		ShaderChunk.bsdfs,
		ShaderChunk.lights_pars_begin,
		ShaderChunk.lights_phong_pars_fragment,
		ShaderChunk.shadowmap_pars_fragment,
		ShaderChunk.bumpmap_pars_fragment,
		ShaderChunk.normalmap_pars_fragment,
		ShaderChunk.specularmap_pars_fragment,
		ShaderChunk.logdepthbuf_pars_fragment,
		ShaderChunk.clipping_planes_pars_fragment,

		"void main() {",

		ShaderChunk.clipping_planes_fragment,

		"vec4 diffuseColor = vec4( diffuse, opacity );",
		"ReflectedLight reflectedLight = ReflectedLight( vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ), vec3( 0.0 ) );",
		"vec3 totalEmissiveRadiance = emissive;",

		ShaderChunk.logdepthbuf_fragment,
		ShaderChunk.map_fragment,
		ShaderChunk.color_fragment,
		ShaderChunk.alphamap_fragment,
		ShaderChunk.alphatest_fragment,
		ShaderChunk.specularmap_fragment,
		ShaderChunk.normal_fragment_begin,
		ShaderChunk.normal_fragment_maps,
		ShaderChunk.emissivemap_fragment,

		// accumulation
		ShaderChunk.lights_phong_fragment,
		ShaderChunk.lights_fragment_begin,
		ShaderChunk.lights_fragment_maps,
		ShaderChunk.lights_fragment_end,

		// modulation
		ShaderChunk.aomap_fragment,

		"vec3 outgoingLight = reflectedLight.directDiffuse + reflectedLight.indirectDiffuse + reflectedLight.directSpecular + reflectedLight.indirectSpecular + totalEmissiveRadiance;",

		ShaderChunk.envmap_fragment,

		"gl_FragColor = vec4( outgoingLight, diffuseColor.a );",

		ShaderChunk.tonemapping_fragment,
		ShaderChunk.encodings_fragment,
		ShaderChunk.fog_fragment,
		ShaderChunk.premultiplied_alpha_fragment,
		ShaderChunk.dithering_fragment,
		"}",
	].join("\n");

	this.setValues(parameters);

}

PackedPhongMaterial.prototype = Object.create(MeshPhongMaterial.prototype);

export { GeometryCompressionUtils, PackedPhongMaterial };