import freezeObject from '../Core/freezeObject.js';

    /**
     * Defines how per-feature colors set from the Cesium API or declarative styling blend with the source colors from
     * the original feature, e.g. glTF material or per-point color in the tile.
     * <p>
     * When <code>REPLACE</code> or <code>MIX</code> are used and the source color is a glTF material, the technique must assign the
     * <code>_3DTILESDIFFUSE</code> semantic to the diffuse color parameter. Otherwise only <code>HIGHLIGHT</code> is supported.
     * </p>
     * <p>
     * A feature whose color evaluates to white (1.0, 1.0, 1.0) is always rendered without color blending, regardless of the
     * tileset's color blend mode.
     * </p>
     * <pre><code>
     * "techniques": {
     *   "technique0": {
     *     "parameters": {
     *       "diffuse": {
     *         "semantic": "_3DTILESDIFFUSE",
     *         "type": 35666
     *       }
     *     }
     *   }
     * }
     * </code></pre>
     *
     * @exports Cesium3DTileColorBlendMode
     */
    var Cesium3DTileColorBlendMode = {
        /**
         * Multiplies the source color by the feature color.
         *
         * @type {Number}
         * @constant
         */
        HIGHLIGHT : 0,

        /**
         * Replaces the source color with the feature color.
         *
         * @type {Number}
         * @constant
         */
        REPLACE : 1,

        /**
         * Blends the source color and feature color together.
         *
         * @type {Number}
         * @constant
         */
        MIX : 2
    };
export default freezeObject(Cesium3DTileColorBlendMode);