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152 lines
2.1 KiB
152 lines
2.1 KiB
import { TempNode } from '../core/TempNode.js';
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import { NodeLib } from '../core/NodeLib.js';
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class PositionNode extends TempNode {
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constructor( scope ) {
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super( 'v3' );
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this.scope = scope || PositionNode.LOCAL;
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}
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getType( ) {
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switch ( this.scope ) {
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case PositionNode.PROJECTION:
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return 'v4';
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}
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return this.type;
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}
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getShared( /* builder */ ) {
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switch ( this.scope ) {
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case PositionNode.LOCAL:
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case PositionNode.WORLD:
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return false;
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}
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return true;
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}
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generate( builder, output ) {
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let result;
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switch ( this.scope ) {
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case PositionNode.LOCAL:
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if ( builder.isShader( 'vertex' ) ) {
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result = 'transformed';
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} else {
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builder.requires.position = true;
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result = 'vPosition';
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}
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break;
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case PositionNode.WORLD:
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if ( builder.isShader( 'vertex' ) ) {
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return '( modelMatrix * vec4( transformed, 1.0 ) ).xyz';
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} else {
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builder.requires.worldPosition = true;
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result = 'vWPosition';
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}
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break;
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case PositionNode.VIEW:
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result = builder.isShader( 'vertex' ) ? '-mvPosition.xyz' : 'vViewPosition';
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break;
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case PositionNode.PROJECTION:
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result = builder.isShader( 'vertex' ) ? '( projectionMatrix * modelViewMatrix * vec4( position, 1.0 ) )' : 'vec4( 0.0 )';
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break;
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}
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return builder.format( result, this.getType( builder ), output );
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}
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copy( source ) {
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super.copy( source );
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this.scope = source.scope;
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return this;
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}
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toJSON( meta ) {
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let data = this.getJSONNode( meta );
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if ( ! data ) {
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data = this.createJSONNode( meta );
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data.scope = this.scope;
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}
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return data;
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}
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}
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PositionNode.LOCAL = 'local';
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PositionNode.WORLD = 'world';
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PositionNode.VIEW = 'view';
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PositionNode.PROJECTION = 'projection';
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PositionNode.prototype.nodeType = 'Position';
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NodeLib.addKeyword( 'position', function () {
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return new PositionNode();
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} );
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NodeLib.addKeyword( 'worldPosition', function () {
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return new PositionNode( PositionNode.WORLD );
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} );
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NodeLib.addKeyword( 'viewPosition', function () {
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return new PositionNode( PositionNode.VIEW );
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} );
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export { PositionNode };
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