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TypeScript
import type { ALPHA_MODES } from '../../rendering/renderers/shared/texture/const';
/**
* Helper for detecting the correct alpha mode for video textures.
* For some reason, some browsers/devices/WebGL implementations premultiply the alpha
* of a video before and then a second time if `UNPACK_PREMULTIPLY_ALPHA_WEBGL`
* is true. So the video is premultiplied twice if the alpha mode is `UNPACK`.
* In this case we need the alpha mode to be `PMA`. This function detects
* the upload behavior by uploading a white 2x2 webm with 50% alpha
* without `UNPACK_PREMULTIPLY_ALPHA_WEBGL` and then checking whether
* the uploaded pixels are premultiplied.
* @category utils
* @internal
* @returns {Promise<ALPHA_MODES>} The correct alpha mode for video textures.
*/
export declare function detectVideoAlphaMode(): Promise<ALPHA_MODES>;