_mipmapRunBundles( commandEncoder, passes ) {

		const levels = passes.length;

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

			const pass = passes[ i ];

			const passEncoder = commandEncoder.beginRenderPass( pass.passDescriptor );

			passEncoder.executeBundles( pass.renderBundles );

			passEncoder.end();

		}

	}
Executes the render bundles.

@param {GPUCommandEncoder} commandEncoder - The GPU command encoder.
@param {Array<Object>} passes - An array of render bundles.