One last minute contribution to yet another edition of the #Pico1k jam hosted by the talented @Liquidream. My 1st attempt to a #Picotron production, using the significant power of userdata operations to implement bump mapping with directional and point lights, in 690 bytes of compressed code.
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Strided userdata substraction is used to compute heightmap derivatives. The point light is implemented using offset products with a precomputed direction map, which then are combined with a precomputed distance map and the lighting values finally derived from a lookup table using userdata:take. This lookup table is setup so that it can simulate saturation when the indices are outside the intended range.
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