_copyCubeMapToTexture( images, textureGPU, textureDescriptorGPU, flipY, premultiplyAlpha ) {

		for ( let i = 0; i < 6; i ++ ) {

			const image = images[ i ];

			const flipIndex = flipY === true ? _flipMap[ i ] : i;

			if ( image.isDataTexture ) {

				this._copyBufferToTexture( image.image, textureGPU, textureDescriptorGPU, flipIndex, flipY );

			} else {

				this._copyImageToTexture( image, textureGPU, textureDescriptorGPU, flipIndex, flipY, premultiplyAlpha );

			}

		}

	}
Uploads cube texture image data to the GPU memory.

@private
@param {Array} images - The cube image data.
@param {GPUTexture} textureGPU - The GPU texture.
@param {Object} textureDescriptorGPU - The GPU texture descriptor.
@param {boolean} flipY - Whether to flip texture data along their vertical axis or not.
@param {boolean} premultiplyAlpha - Whether the texture should have its RGB channels premultiplied by the alpha channel or not.