Fix texturing code to account for perspective viewing.
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Elefant-Freeciv commented
The current version has a rendering glitch in which the sides of the cube appear to warp when increasing the zoom level. I believe this is due to the phenomenon describe at the following web address: https://www.scratchapixel.com/lessons/3d-basic-rendering/rasterization-practical-implementation/perspective-correct-interpolation-vertex-attributes.html.
Elefant-Freeciv commented
Fixed it in d8f0bfd