Procedural animated texture generation/Water

Still water
Adapted from https://github.com/UnknownShadow200/ClassiCube/wiki/MInecraft-Classic-lava-animation-algorithm#water

Every frame, for each position in the still water texture array, the respective values for soup_heat, pot_heat and flame_heat are calculated as detailed below:


 * Calculates a local_soup_heat equal to the sum of the 3x1 soup_heat neighborhood around the current element.
 * Calculates the new soup_heat as the sum of the local_soup_heat divided by 3.3F plus the pot_heat times 0.8F
 * Calculates the new pot_heat as the current pot_heat plus the flame_heat times 0.05. pot_heat is clamped to a minimum of 0.
 * Calculates the new flame_heat as the current flame_heat minus 0.1F.
 * However, there is a 0.05 in 1 random chance that flame_heat is set to 0.5.

Flowing water
In addition, the flowing water texture also uses a spatial translation to give the appearence of movement. This transformation moves the flowing water texture downwards by one pixel after a fixed amount of time, wrapping the bottom layer of the texture back to the top.