import { BLEND_MODES } from '../const';

/**
 * Corrects PixiJS blend, takes premultiplied alpha into account
 *
 * @memberof PIXI
 * @function mapPremultipliedBlendModes
 * @private
 * @param {Array<number[]>} [array] - The array to output into.
 * @return {Array<number[]>} Mapped modes.
 */

export default function mapPremultipliedBlendModes()
{
    const pm = [];
    const npm = [];

    for (let i = 0; i < 32; i++)
    {
        pm[i] = i;
        npm[i] = i;
    }

    pm[BLEND_MODES.NORMAL_NPM] = BLEND_MODES.NORMAL;
    pm[BLEND_MODES.ADD_NPM] = BLEND_MODES.ADD;
    pm[BLEND_MODES.SCREEN_NPM] = BLEND_MODES.SCREEN;

    npm[BLEND_MODES.NORMAL] = BLEND_MODES.NORMAL_NPM;
    npm[BLEND_MODES.ADD] = BLEND_MODES.ADD_NPM;
    npm[BLEND_MODES.SCREEN] = BLEND_MODES.SCREEN_NPM;

    const array = [];

    array.push(npm);
    array.push(pm);

    return array;
}