Resources involved are sand, metals, energy, and colorants. Recycling happens much like manufacturing. It is remelted and fed to a furnace which melts, then refines the materials. Heat is applied by prheated combustion air, radiation from furnace walls, and to a lesser extent from diurect heat. Molten glass flows to the refiner.
Heat is recovered.
Glass is then molded. It is a low value product. Reuse rather than recycling is often desirable, but food contact problems make this often impossible. Additionally, whereas container glass has had a recycling infrastructure built up, other forms of glass, especially plate glass, have not. Ask the Glass Packaging Institute.