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import { Matrix3, Plane, Vector4 } from 'three';
const _plane = new Plane();
const _viewNormalMatrix = new Matrix3();
let _clippingContextVersion = 0;
class ClippingContext {
constructor() {
this.version = ++ _clippingContextVersion;
this.globalClippingCount = 0;
this.localClippingCount = 0;
this.localClippingEnabled = false;
this.localClipIntersection = false;
this.planes = [];
this.parentVersion = 0;
}
projectPlanes( source, offset ) {
const l = source.length;
const planes = this.planes;
for ( let i = 0; i < l; i ++ ) {
_plane.copy( source[ i ] ).applyMatrix4( this.viewMatrix, _viewNormalMatrix );
const v = planes[ offset + i ];
const normal = _plane.normal;
v.x = - normal.x;
v.y = - normal.y;
v.z = - normal.z;
v.w = _plane.constant;
}
}
updateGlobal( renderer, camera ) {
const rendererClippingPlanes = renderer.clippingPlanes;
this.viewMatrix = camera.matrixWorldInverse;
_viewNormalMatrix.getNormalMatrix( this.viewMatrix );
let update = false;
if ( Array.isArray( rendererClippingPlanes ) && rendererClippingPlanes.length !== 0 ) {
const l = rendererClippingPlanes.length;
if ( l !== this.globalClippingCount ) {
const planes = [];
for ( let i = 0; i < l; i ++ ) {
planes.push( new Vector4() );
}
this.globalClippingCount = l;
this.planes = planes;
update = true;
}
this.projectPlanes( rendererClippingPlanes, 0 );
} else if ( this.globalClippingCount !== 0 ) {
this.globalClippingCount = 0;
this.planes = [];
update = true;
}
if ( renderer.localClippingEnabled !== this.localClippingEnabled ) {
this.localClippingEnabled = renderer.localClippingEnabled;
update = true;
}
if ( update ) this.version = _clippingContextVersion ++;
}
update( parent, material ) {
let update = false;
if ( this !== parent && parent.version !== this.parentVersion ) {
this.globalClippingCount = material.isShadowNodeMaterial ? 0 : parent.globalClippingCount;
this.localClippingEnabled = parent.localClippingEnabled;
this.planes = Array.from( parent.planes );
this.parentVersion = parent.version;
this.viewMatrix = parent.viewMatrix;
update = true;
}
if ( this.localClippingEnabled ) {
const localClippingPlanes = material.clippingPlanes;
if ( ( Array.isArray( localClippingPlanes ) && localClippingPlanes.length !== 0 ) ) {
const l = localClippingPlanes.length;
const planes = this.planes;
const offset = this.globalClippingCount;
if ( update || l !== this.localClippingCount ) {
planes.length = offset + l;
for ( let i = 0; i < l; i ++ ) {
planes[ offset + i ] = new Vector4();
}
this.localClippingCount = l;
update = true;
}
this.projectPlanes( localClippingPlanes, offset );
} else if ( this.localClippingCount !== 0 ) {
this.localClippingCount = 0;
update = true;
}
if ( this.localClipIntersection !== material.clipIntersection ) {
this.localClipIntersection = material.clipIntersection;
update = true;
}
}
if ( update ) this.version = _clippingContextVersion ++;
}
}
export default ClippingContext;