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