Rewrite texture tiling implementation

inline halfxb

So we know which is the first pixel by masking.

inline xl

inline xb a bit

inline yl

inline uv1.x shift

remove likely wrong guessed ternary operator

add pixel layout comment

inline xel

optimize the shifts a bit

inline xb

optimize shifts in a second step

extract xb

rename all variables

calculate cache line by position.x

Revert 5115b459f40d53044cd7a858f52e6e876e1211b4 "optimize the shifts a bit"

It seems I was wrong, the other way is the more natural.

use x_virtual_position instead of uv1.x for x_offset_in_block

This looks more natural and the offset should be masked anyway.

substitude factor with cache_lines

move 32bit logic in a conditional block