isleward/src/client/js/rendering/shaders/outline.js

define([
	'js/rendering/shaders/outline/vert',
	'js/rendering/shaders/outline/frag'
], function (
	vertex,
	fragment
) {
	const _thickness = 1;
	const _alpha = 1.0;
	const _knockout = false;

	class OutlineFilter extends PIXI.Filter {
		constructor (thickness = 5, color = 0xFFFFFF, quality = 0.1, alpha = 1.0, knockout = false) {
			const angleStep = Math.PI / 2;
			color = PIXI.utils.hex2rgb(color);

			super(vertex, fragment.replace('$angleStep$', angleStep));

			this.uniforms.uThickness = new Float32Array([thickness, thickness]);
			this.uniforms.uColor = new Float32Array([0, 0.0, 0.0, 1]);
			this.uniforms.uAlpha = alpha;
			this.uniforms.uKnockout = knockout;

			Object.assign(this, { thickness, color, quality, alpha, knockout });
		}

		getAngleStep (quality) {
			const samples = Math.max(
				quality * MAX_SAMPLES,
				MIN_SAMPLES,
			);

			return (Math.PI * 2 / samples).toFixed(7);
		}

		apply (filterManager, input, output, clear) {
			this.uniforms.uThickness[0] = this.thickness / input._frame.width;
			this.uniforms.uThickness[1] = this.thickness / input._frame.height;
			this.uniforms.uAlpha = this.alpha;
			this.uniforms.uKnockout = this.knockout;
			this.uniforms.uColor = PIXI.utils.hex2rgb(this.color, this.uniforms.uColor);

			filterManager.applyFilter(this, input, output, clear);
		}

		get alpha () {
			return this._alpha;
		}
		set alpha (value) {
			this._alpha = value;
		}

		get color () {
			return PIXI.utils.rgb2hex(this.uniforms.uColor);
		}
		set color (value) {
			PIXI.utils.hex2rgb(value, this.uniforms.uColor);
		}

		get knockout () {
			return this._knockout;
		}
		set knockout (value) {
			this._knockout = value;
		}

		get thickness () {
			return this._thickness;
		}
		set thickness (value) {
			this._thickness = value;
			this.padding = value;
		}
	}

	return OutlineFilter;
});