normalize_abs
t->x = normalize_abs(&input->filter.h, t->pos->x);
t->y = normalize_abs(&input->filter.v, t->pos->y);
dx = normalize_abs(&input->filter.h, t->pos->x) - t->x;
dy = normalize_abs(&input->filter.v, t->pos->y) - t->y;
x = normalize_abs(&input->filter.h, t->pos->x);
y = normalize_abs(&input->filter.v, t->pos->y);