WebGL1PixelFormat:
    | typeof AlphaFormat
    | typeof LuminanceFormat
    | typeof LuminanceAlphaFormat
    | typeof DepthFormat
    | typeof DepthStencilFormat
    | typeof RedFormat
    | typeof RedIntegerFormat
    | typeof RGFormat
    | typeof _SRGBAFormat

Texture Pixel Formats Modes. Compatible only with WebGLRenderingContext | WebGL 1 Rendering Context.

Note that the texture must have the correct THREE.Texture.type set, as described in TextureDataType.