three 基础库
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import { TempNode } from '../core/TempNode.js';
import { NodeLib } from '../core/NodeLib.js';
class NormalNode extends TempNode {
constructor( scope ) {
super( 'v3' );
this.scope = scope || NormalNode.VIEW;
}
getShared() {
// if shared is false, TempNode will not create temp variable (for optimization)
return this.scope === NormalNode.WORLD;
}
build( builder, output, uuid, ns ) {
const contextNormal = builder.context[ this.scope + 'Normal' ];
if ( contextNormal ) {
return contextNormal.build( builder, output, uuid, ns );
}
return super.build( builder, output, uuid );
}
generate( builder, output ) {
let result;
switch ( this.scope ) {
case NormalNode.VIEW:
if ( builder.isShader( 'vertex' ) ) result = 'transformedNormal';
else result = 'geometryNormal';
break;
case NormalNode.LOCAL:
if ( builder.isShader( 'vertex' ) ) {
result = 'objectNormal';
} else {
builder.requires.normal = true;
result = 'vObjectNormal';
}
break;
case NormalNode.WORLD:
if ( builder.isShader( 'vertex' ) ) {
result = 'inverseTransformDirection( transformedNormal, viewMatrix ).xyz';
} else {
builder.requires.worldNormal = true;
result = 'vWNormal';
}
break;
}
return builder.format( result, this.getType( builder ), output );
}
copy( source ) {
super.copy( source );
this.scope = source.scope;
return this;
}
toJSON( meta ) {
let data = this.getJSONNode( meta );
if ( ! data ) {
data = this.createJSONNode( meta );
data.scope = this.scope;
}
return data;
}
}
NormalNode.LOCAL = 'local';
NormalNode.WORLD = 'world';
NormalNode.VIEW = 'view';
NormalNode.prototype.nodeType = 'Normal';
NodeLib.addKeyword( 'viewNormal', function () {
return new NormalNode( NormalNode.VIEW );
} );
NodeLib.addKeyword( 'localNormal', function () {
return new NormalNode( NormalNode.NORMAL );
} );
NodeLib.addKeyword( 'worldNormal', function () {
return new NormalNode( NormalNode.WORLD );
} );
export { NormalNode };