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