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M2Loader.js
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M2Loader.js
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import {
AdditiveBlending,
AnimationClip,
Bone,
Box3,
BufferGeometry,
Color,
ColorKeyframeTrack,
CompressedTexture,
DataTexture,
DoubleSide,
FileLoader,
Float32BufferAttribute,
FrontSide,
Group,
InterpolateLinear,
InterpolateSmooth,
InterpolateDiscrete,
LinearFilter,
LinearMipmapLinearFilter,
Loader,
LoaderUtils,
Mesh,
MeshBasicMaterial,
MeshLambertMaterial,
NumberKeyframeTrack,
Quaternion,
QuaternionKeyframeTrack,
RepeatWrapping,
RGBA_S3TC_DXT1_Format,
RGBA_S3TC_DXT3_Format,
RGBA_S3TC_DXT5_Format,
RGBA_BPTC_Format,
Skeleton,
SkinnedMesh,
SRGBColorSpace,
Uint8BufferAttribute,
Vector2,
Vector3,
Vector4,
VectorKeyframeTrack,
AnimationMixer
} from 'three';
/**
* The loader in its current state is just a foundation for a more advanced M2 loader. Right now, the class only implements
* a small portion of what is defined at https://wowdev.wiki/M2.
*/
class M2Loader extends Loader {
/**
* Constructs a new loader instance.
*
* @param {THREE.LoadingManager} manager - The loading manager.
*/
constructor( manager ) {
super( manager );
}
/**
* Method for loading an M2 asset by the given URL.
*
* @param {String} url - The URL to the M2 asset.
* @param {onLoad} onLoad - A callback function executed when the asset has been loaded.
* @param {onProgress} onProgress - A callback function executed during the loading process indicating the progress.
* @param {onError} onError - A callback function executed when an error occurs.
* @param {M2Options} options - An optional configuration object.
*/
load( url, onLoad, onProgress, onError, options = new M2Options() ) {
const loader = new FileLoader( this.manager );
loader.setPath( this.path );
loader.setResponseType( 'arraybuffer' );
loader.setRequestHeader( this.requestHeader );
loader.setWithCredentials( this.withCredentials );
loader.load( url, ( buffer ) => {
try {
this.parse( buffer, url, options ).then( onLoad );
} catch ( e ) {
if ( onError ) {
onError( e );
} else {
console.error( e );
}
this.manager.itemError( url );
}
}, onProgress, onError );
}
/**
* Overwrites the implementation in THREE.Loader to support the options parameter.
*
* @param {String} url - The URL to the M2 asset.
* @param {onProgress} onProgress - A callback function executed during the loading process indicating the progress.
* @param {M2Options} options - An optional configuration object.
* @returns {Promise} A promise representing the async loading and parsing process.
*/
loadAsync( url, onProgress, options ) {
const scope = this;
return new Promise( function ( resolve, reject ) {
scope.load( url, resolve, onProgress, reject, options );
} );
}
/**
* This method parses the loaded M2 data and creates three.js entities for rendering.
*
* @param {ArrayBuffer} buffer - The loaded M2 data.
* @param {String} url - The URL to the M2 asset.
* @param {M2Options} options - Holds optional configuration data.
* @returns {THREE.Group} The parsed M2 asset.
*/
async parse( buffer, url, options ) {
const parser = new BinaryParser( buffer );
const resourcePath = LoaderUtils.extractUrlBase( url );
let chunks = new Map();
let chunkedFile = false;
// magic
let magic = parser.readString( 4 );
if ( magic === 'MD21' ) {
chunkedFile = true;
parser.offset += 4; // skip "size" field of MD21 chunk
parser.chunkOffset = parser.offset; // offsets inside chunks are relative to the chunk, not the file
magic = parser.readString( 4 );
}
if ( magic !== 'MD20' ) {
throw new Error( 'THREE.M2Loader: Invalid magic data' );
}
// headers
const header = this._readHeader( parser );
// chunks
if ( chunkedFile === true ) {
chunks = this._readChunks( buffer, header );
}
// data
const name = this._readName( parser, header );
const vertices = this._readVertices( parser, header );
const sequences = this._readSequences( parser, header );
const globalSequences = this._readGlobalSequences( parser, header );
const sequenceManager = new SequenceManager( sequences, globalSequences, name, resourcePath );
const colorDefinitions = this._readColorDefinitions( parser, header, sequenceManager );
const materialDefinitions = this._readMaterialDefinitions( parser, header );
const textureDefinitions = this._readTextureDefinitions( parser, header );
const textureTransformDefinitions = this._readTextureTransformDefinitions( parser, header, sequenceManager );
const textureWeightDefinitions = this._readTextureWeightDefinitions( parser, header, sequenceManager );
const boneDefinitions = this._readBoneDefinitions( parser, header, sequenceManager );
// lookup tables
const lookupTables = {};
lookupTables.bones = this._readBoneLookupTable( parser, header );
lookupTables.textures = this._readTextureLookupTable( parser, header );
lookupTables.textureTransforms = this._readTextureTransformsLookupTable( parser, header );
lookupTables.textureWeights = this._readTextureWeightsLookupTable( parser, header );
// loaders
const textureLoader = new BLPLoader( this.manager );
textureLoader.setPath( resourcePath );
textureLoader.setVersion( header.version );
const skinLoader = new M2SkinLoader( this.manager );
skinLoader.setPath( resourcePath );
skinLoader.setVersion( header.version );
// load textures and skin data asynchronously
const textures = await Promise.all( this._loadTextures( textureDefinitions, textureLoader, chunks, options ) );
const skinData = await this._loadSkin( header, parser, skinLoader, name, chunks );
// build scene
const geometries = this._buildGeometries( skinData, vertices );
const skeletonData = this._buildSkeleton( boneDefinitions, sequenceManager );
const materials = this._buildMaterials( materialDefinitions );
const textureTransforms = this._buildTextureTransforms( textureTransformDefinitions );
const textureWeights = this._buildTextureWeights( textureWeightDefinitions );
const colors = this._buildColors( colorDefinitions );
const group = this._buildObjects( name, geometries, skeletonData, materials, colors, textures, textureTransforms, textureWeights, skinData, lookupTables, sequenceManager );
group.userData.sequenceManager = sequenceManager;
return group;
}
_buildObjects( name, geometries, skeletonData, materials, colors, textures, textureTransforms, textureWeights, skinData, lookupTables, sequenceManager ) {
const group = new Group();
group.name = name;
const skeleton = skeletonData.skeleton;
// meshes
const batches = skinData.batches;
for ( let i = 0; i < batches.length; i ++ ) {
const batch = batches[ i ];
const geometry = geometries[ batch.skinSectionIndex ];
const material = materials[ batch.materialIndex ].clone(); // cloning is required since the same material might be animated differently
// texture
const textureIndex = lookupTables.textures[ batch.textureComboIndex ];
if ( textureIndex !== undefined ) {
material.map = textures[ textureIndex ].clone(); // cloning is required since the same texture might be animated differently
}
// texture transform animations
const textureTransformIndex = lookupTables.textureTransforms[ batch.textureTransformComboIndex ];
if ( textureTransformIndex !== undefined ) {
const data = textureTransforms[ textureTransformIndex ];
if ( data !== undefined ) {
const translation = data.translation;
const rotation = data.rotation;
if ( translation.animated === false ) {
material.map.offset.copy( translation.constant );
}
if ( rotation.animated === false ) {
material.map.rotation = rotation.constant;
}
if ( translation.animated || rotation.animated ) {
const tracks = data.tracks;
const globalTracks = data.globalTracks;
for ( let j = 0; j < tracks.length; j ++ ) {
if ( tracks[ j ] === undefined ) continue;
const clip = new AnimationClip( 'TextureTransform_' + j, - 1, [ ...tracks[ j ] ] );
sequenceManager.addAnimationToSequence( clip, material.map, j );
}
for ( let j = 0; j < globalTracks.length; j ++ ) {
if ( globalTracks[ j ] === undefined ) continue;
const clip = new AnimationClip( 'GlobalTextureTransform_' + j, - 1, [ ...globalTracks[ j ] ] );
sequenceManager.addAnimationToGlobalSequence( clip, material.map, j );
}
}
}
}
// texture weight
const textureWeightIndex = lookupTables.textureWeights[ batch.textureWeightComboIndex ];
if ( textureWeightIndex !== undefined ) {
const data = textureWeights[ textureWeightIndex ];
if ( data !== undefined ) {
const weight = data.weight;
if ( weight.animated === false ) {
material.opacity *= weight.constant;
} else {
const tracks = data.tracks;
const globalTracks = data.globalTracks;
for ( let j = 0; j < tracks.length; j ++ ) {
if ( tracks[ j ] === undefined ) continue;
const clip = new AnimationClip( 'Opacity_' + j, - 1, [ ...tracks[ j ] ] );
sequenceManager.addAnimationToSequence( clip, material, j );
}
for ( let j = 0; j < globalTracks.length; j ++ ) {
if ( globalTracks[ j ] === undefined ) continue;
const clip = new AnimationClip( 'GlobalOpacity_' + j, - 1, [ ...globalTracks[ j ] ] );
sequenceManager.addAnimationToGlobalSequence( clip, material, j );
}
}
}
}
// color and alpha
const colorData = colors[ batch.colorIndex ];
if ( colorData !== undefined ) {
const color = colorData.color;
const alpha = colorData.alpha;
if ( color.animated === false ) {
material.color.copy( color.constant );
}
if ( alpha.animated === false ) {
material.opacity *= alpha.constant;
}
if ( color.animated || alpha.animated ) {
for ( let j = 0; j < colorData.tracks.length; j ++ ) {
const tracks = colorData.tracks[ j ];
if ( tracks === undefined ) continue;
const clip = new AnimationClip( 'ColorAndAlpha_' + j, - 1, [ ... tracks ] );
sequenceManager.addAnimationToSequence( clip, material, j );
}
for ( let j = 0; j < colorData.globalTracks.length; j ++ ) {
const globalTracks = colorData.globalTracks[ j ];
if ( globalTracks === undefined ) continue;
const clip = new AnimationClip( 'GlobalColorAndAlpha_' + j, - 1, [ ... globalTracks ] );
sequenceManager.addAnimationToGlobalSequence( clip, material, j );
}
}
}
// mesh
let mesh;
if ( skeleton !== null ) {
mesh = new SkinnedMesh( geometry, material );
mesh.bind( skeleton );
} else {
mesh = new Mesh( geometry, material );
}
group.add( mesh );
}
// skeleton
if ( skeleton !== null ) {
// bones must be part of the scene hierarchy
for ( const bone of skeleton.bones ) {
if ( bone.parent === null ) group.add( bone );
}
// animations
const tracks = skeletonData.tracks;
const globalTracks = skeletonData.globalTracks;
for ( let j = 0; j < tracks.length; j ++ ) {
if ( tracks[ j ] === undefined ) continue;
const clip = new AnimationClip( 'SkeletonAnimation_' + j, - 1, [ ... tracks[ j ] ] );
sequenceManager.addAnimationToSequence( clip, group, j );
}
for ( let j = 0; j < globalTracks.length; j ++ ) {
if ( globalTracks[ j ] === undefined ) continue;
const clip = new AnimationClip( 'GlobalSkeletonAnimation_' + j, - 1, [ ... globalTracks[ j ] ] );
sequenceManager.addAnimationToGlobalSequence( clip, group, j );
}
}
return group;
}
_buildColors( colorDefinitions ) {
const colors = [];
for ( let i = 0; i < colorDefinitions.length; i ++ ) {
const colorDefinition = colorDefinitions[ i ];
if ( colorDefinition !== undefined ) {
const data = {
color: {
constant: new Color(),
animated: true
},
alpha: {
constant: 1,
animated: true
},
tracks: [],
globalTracks: [],
};
const color = colorDefinition.color;
const alpha = colorDefinition.alpha;
if ( isStaticTrack( color ) ) {
data.color.constant.fromArray( color.values[ 0 ] );
data.color.animated = false;
} else {
for ( let j = 0; j < color.timestamps.length; j ++ ) {
const times = color.timestamps[ j ];
const values = color.values[ j ];
// ignore empty tracks
if ( times.length === 0 ) continue;
// interpolation type
const interpolation = getInterpolation( color.interpolationType );
// keyframe track
if ( color.globalSequence >= 0 ) {
if ( data.globalTracks[ color.globalSequence ] === undefined ) data.globalTracks[ color.globalSequence ] = [];
data.globalTracks[ color.globalSequence ].push( new ColorKeyframeTrack( '.color', times, values, interpolation ) );
} else {
if ( data.tracks[ j ] === undefined ) data.tracks[ j ] = [];
data.tracks[ j ].push( new ColorKeyframeTrack( '.color', times, values, interpolation ) );
}
}
}
if ( isStaticTrack( alpha ) ) {
data.alpha.constant = alpha.values[ 0 ][ 0 ];
data.alpha.animated = false;
} else {
for ( let j = 0; j < alpha.timestamps.length; j ++ ) {
const times = alpha.timestamps[ j ];
const values = alpha.values[ j ];
// ignore empty tracks
if ( times.length === 0 ) continue;
// interpolation type
const interpolation = getInterpolation( alpha.interpolationType );
// keyframe track
if ( alpha.globalSequence >= 0 ) {
if ( data.globalTracks[ alpha.globalSequence ] === undefined ) data.globalTracks[ alpha.globalSequence ] = [];
data.globalTracks[ alpha.globalSequence ].push( new NumberKeyframeTrack( '.opacity', times, values, interpolation ) );
} else {
if ( data.tracks[ j ] === undefined ) data.tracks[ j ] = [];
data.tracks[ j ].push( new NumberKeyframeTrack( '.opacity', times, values, interpolation ) );
}
}
}
colors.push( data );
}
}
return colors;
}
_buildGeometries( skinData, vertices ) {
// geometry
const localVertexList = skinData.localVertexList;
const indices = skinData.indices;
const submeshes = skinData.submeshes;
// buffer attributes
const position = [];
const normal = [];
const uv = [];
const skinIndex = [];
const skinWeight = [];
for ( let i = 0; i < localVertexList.length; i ++ ) {
const vertexIndex = localVertexList[ i ];
const vertex = vertices[ vertexIndex ];
// TODO: Implement up-axis conversion (z-up to y-up), figure out if WoW is left- or right-handed
position.push( vertex.pos.x, vertex.pos.y, vertex.pos.z );
normal.push( vertex.normal.x, vertex.normal.y, vertex.normal.z );
uv.push( vertex.texCoords[ 0 ].x, vertex.texCoords[ 0 ].y );
skinIndex.push( vertex.boneIndices.x, vertex.boneIndices.y, vertex.boneIndices.z, vertex.boneIndices.w );
skinWeight.push( vertex.boneWeights.x, vertex.boneWeights.y, vertex.boneWeights.z, vertex.boneWeights.w );
}
const positionAttribute = new Float32BufferAttribute( position, 3 );
const normalAttribute = new Float32BufferAttribute( normal, 3 );
const uvAttribute = new Float32BufferAttribute( uv, 2 );
const skinIndexAttribute = new Uint8BufferAttribute( skinIndex, 4 );
const skinWeightAttribute = new Uint8BufferAttribute( skinWeight, 4, true );
// geometries
const geometries = [];
for ( let i = 0; i < submeshes.length; i ++ ) {
const submesh = submeshes[ i ];
const index = indices.slice( submesh.indexStart, submesh.indexStart + submesh.indexCount );
const geometry = new BufferGeometry();
geometry.setAttribute( 'position', positionAttribute );
geometry.setAttribute( 'normal', normalAttribute );
geometry.setAttribute( 'uv', uvAttribute );
geometry.setAttribute( 'skinIndex', skinIndexAttribute );
geometry.setAttribute( 'skinWeight', skinWeightAttribute );
geometry.setIndex( index );
geometries.push( geometry );
}
return geometries;
}
_buildMaterials( materialDefinitions ) {
const materials = [];
for ( let i = 0; i < materialDefinitions.length; i ++ ) {
const materialDefinition = materialDefinitions[ i ];
const materialFlags = materialDefinition.flags;
const blendingMode = materialDefinition.blendingMode;
// TODO Honor remaining material flags and blending modes
const material = ( materialFlags & M2_MATERIAL_UNLIT ) ? new MeshBasicMaterial() : new MeshLambertMaterial();
material.fog = ( materialFlags & M2_MATERIAL_UNFOGGED ) ? false : true;
material.side = ( materialFlags & M2_MATERIAL_TWO_SIDED ) ? DoubleSide : FrontSide;
material.depthTest = ( materialFlags & M2_MATERIAL_DEPTH_TEST ) ? false : true;
material.depthWrite = ( materialFlags & M2_MATERIAL_DEPTH_WRITE ) ? false : true;
switch ( blendingMode ) {
case M2_BLEND_OPAQUE:
material.alphaTest = 0;
material.transparent = false;
break;
case M2_BLEND_ALPHA_KEY:
material.alphaTest = 0.5;
material.transparent = false;
break;
case M2_BLEND_ALPHA:
material.alphaTest = 0;
material.transparent = true;
break;
case M2_BLEND_ADD:
material.alphaTest = 0;
material.transparent = true;
material.blending = AdditiveBlending;
break;
default:
console.warn( 'THREE.M2Loader: Unsupported blending mode.' );
break;
}
materials.push( material );
}
return materials;
}
_buildSkeleton( boneDefinitions, sequenceManager ) {
const data = {
tracks: [],
globalTracks: [],
skeleton: null
};
// TODO: Find out a better way for detecting static models
// Problem: Even static models might have bone definitions
if ( boneDefinitions.length < 8 ) return data;
const bones = [];
for ( let i = 0; i < boneDefinitions.length; i ++ ) {
const boneDefinition = boneDefinitions[ i ];
const bone = new PivotBone();
bone.pivot.copy( boneDefinition.pivot ); // three.js does not support pivot points so a custom bone class is required
bones.push( bone );
// build hierarchy
const parentIndex = boneDefinition.parentBone;
if ( parentIndex !== - 1 ) bones[ parentIndex ].add( bone );
// animations
const translationData = boneDefinition.translation;
const rotationData = boneDefinition.rotation;
const scaleData = boneDefinition.scale;
for ( let j = 0; j < translationData.timestamps.length; j ++ ) {
const times = translationData.timestamps[ j ];
const values = translationData.values[ j ];
// ignore empty tracks
if ( times.length === 0 ) continue;
// interpolation type
const interpolation = getInterpolation( translationData.interpolationType );
// keyframe track
let track;
if ( translationData.globalSequence >= 0 ) {
if ( data.globalTracks[ translationData.globalSequence ] === undefined ) data.globalTracks[ translationData.globalSequence ] = [];
track = new VectorKeyframeTrack( bone.uuid + '.position', times, values, interpolation );
data.globalTracks[ translationData.globalSequence ].push( track );
} else {
if ( data.tracks[ j ] === undefined ) data.tracks[ j ] = [];
track = new VectorKeyframeTrack( bone.uuid + '.position', times, values, interpolation );
data.tracks[ j ].push( track );
}
// external data
const externalTimestamps = translationData.externalTimestamps[ j ];
const externalValues = translationData.externalValues[ j ];
if ( externalTimestamps !== undefined ) {
const sequence = sequenceManager.sequences[ j ];
sequenceManager.addExternalTrack( sequence.id, sequence.variationIndex, externalTimestamps, externalValues, track );
}
}
for ( let j = 0; j < rotationData.timestamps.length; j ++ ) {
const times = rotationData.timestamps[ j ];
const values = rotationData.values[ j ];
// ignore empty tracks
if ( times.length === 0 ) continue;
// interpolation type
const interpolation = getInterpolation( rotationData.interpolationType );
// keyframe track
let track;
if ( rotationData.globalSequence >= 0 ) {
if ( data.globalTracks[ rotationData.globalSequence ] === undefined ) data.globalTracks[ rotationData.globalSequence ] = [];
track = new QuaternionKeyframeTrack( bone.uuid + '.quaternion', times, values, interpolation );
data.globalTracks[ rotationData.globalSequence ].push( track );
} else {
if ( data.tracks[ j ] === undefined ) data.tracks[ j ] = [];
track = new QuaternionKeyframeTrack( bone.uuid + '.quaternion', times, values, interpolation );
data.tracks[ j ].push( track );
}
// external data
const externalTimestamps = rotationData.externalTimestamps[ j ];
const externalValues = rotationData.externalValues[ j ];
if ( externalTimestamps !== undefined ) {
const sequence = sequenceManager.sequences[ j ];
sequenceManager.addExternalTrack( sequence.id, sequence.variationIndex, externalTimestamps, externalValues, track );
}
}
for ( let j = 0; j < scaleData.timestamps.length; j ++ ) {
const times = scaleData.timestamps[ j ];
const values = scaleData.values[ j ];
// ignore empty tracks
if ( times.length === 0 ) continue;
// interpolation type
const interpolation = getInterpolation( scaleData.interpolationType );
// keyframe track
let track;
if ( scaleData.globalSequence >= 0 ) {
if ( data.globalTracks[ scaleData.globalSequence ] === undefined ) data.globalTracks[ scaleData.globalSequence ] = [];
track = new VectorKeyframeTrack( bone.uuid + '.scale', times, values, interpolation );
data.globalTracks[ scaleData.globalSequence ].push( track );
} else {
if ( data.tracks[ j ] === undefined ) data.tracks[ j ] = [];
track = new VectorKeyframeTrack( bone.uuid + '.scale', times, values, interpolation );
data.tracks[ j ].push( track );
}
// external data
const externalTimestamps = scaleData.externalTimestamps[ j ];
const externalValues = scaleData.externalValues[ j ];
if ( externalTimestamps !== undefined ) {
const sequence = sequenceManager.sequences[ j ];
sequenceManager.addExternalTrack( sequence.id, sequence.variationIndex, externalTimestamps, externalValues, track );
}
}
}
data.skeleton = new Skeleton( bones );
return data;
}
_buildTextureTransforms( textureTransformDefinitions ) {
const textureTransforms = [];
for ( let i = 0; i < textureTransformDefinitions.length; i ++ ) {
const textureTransformDefinition = textureTransformDefinitions[ i ];
const data = {
translation: {
constant: new Vector2(),
animated: true
},
rotation: {
constant: 1,
animated: true
},
tracks: [],
globalTracks: [],
};
const translation = textureTransformDefinition.translation;
const rotation = textureTransformDefinition.rotation;
// translation
if ( isStaticTrack( translation ) ) {
data.translation.constant.copy( translation.values[ 0 ] );
data.translation.animated = false;
} else {
for ( let j = 0; j < translation.timestamps.length; j ++ ) {
const times = translation.timestamps[ j ];
const vi = translation.values[ j ];
const values = [];
// ignore empty tracks
if ( times.length === 0 ) continue;
// values
for ( let k = 0; k < vi.length; k += 3 ) {
// extract x,y, ignore z
values.push( vi[ k ] );
values.push( vi[ k + 1 ] );
}
// interpolation type
const interpolation = getInterpolation( translation.interpolationType );
// keyframe track
if ( translation.globalSequence >= 0 ) {
if ( data.globalTracks[ translation.globalSequence ] === undefined ) data.globalTracks[ translation.globalSequence ] = [];
data.globalTracks[ translation.globalSequence ].push( new VectorKeyframeTrack( '.offset', times, values, interpolation ) );
} else {
if ( data.tracks[ j ] === undefined ) data.tracks[ j ] = [];
data.tracks[ j ].push( new VectorKeyframeTrack( '.offset', times, values, interpolation ) );
}
}
}
// rotation
const q = new Quaternion();
if ( isStaticTrack( rotation ) ) {
q.fromArray( rotation.values[ 0 ] );
data.rotation.constant = quaternionToAngle( q, 0 );
data.rotation.animated = false;
} else {
for ( let j = 0; j < rotation.timestamps.length; j ++ ) {
const times = rotation.timestamps[ j ];
const vi = rotation.values[ j ];
const values = [];
// ignore empty tracks