glam/es5/lib/renderer/forward/build-defines.js

Experimental WebGL Engine

"use strict";

Object.defineProperty(exports, "__esModule", {
	value: true
});
exports.default = buildDefines;
/*
 * Adds unique defines to the top of a shader. When defines differ between shaders
 * a unique shader program is compiled and cached. Materials that share the same
 * shader code will result in the same cached shader. The defines are located
 * on the material property material.defines, and then the number of lights is
 * added at the end.
 */

function wordToExpression(define) {
	return "#define " + define + "\n";
}

function buildDefines(material, scene) {

	var flags = material.defines.map(wordToExpression).join("");

	if (material.flags.useLights) {
		flags += "#define DIRECTIONAL_LIGHT_COUNT " + scene.getByType('light/directional').length + "\n";
	}

	return flags;
}