@polygonjs/polygonjs/src/engine/nodes/gl/Negate.ts

node-based WebGL 3D engine https://polygonjs.com

/**
 * multiplies a value by -1
 *
 *
 *
 */

import {BaseNodeGlMathFunctionArg1GlNode} from './_BaseMathFunction';
import {ThreeToGl} from '../../../core/ThreeToGl';
import {ShadersCollectionController} from './code/utils/ShadersCollectionController';

export class NegateGlNode extends BaseNodeGlMathFunctionArg1GlNode {
	static override type() {
		return 'negate';
	}

	override initializeNode() {
		super.initializeNode();

		this.io.connection_points.set_input_name_function((index: number) => ['in'][index]);
	}

	protected override _gl_input_name(index: number) {
		return ['in'][index];
	}

	override setLines(shaders_collection_controller: ShadersCollectionController) {
		const connectionPoints = this.io.inputs.namedInputConnectionPoints();
		if (!connectionPoints) {
			return;
		}
		const in_value = ThreeToGl.any(this.variableForInput(this._gl_input_name(0)));

		const gl_type = connectionPoints[0].type();
		const out = this.glVarName(this.io.connection_points.output_name(0));
		const body_line = `${gl_type} ${out} = -1.0 * ${in_value}`;
		shaders_collection_controller.addBodyLines(this, [body_line]);
	}
}