blerp function

double blerp(
  1. double a,
  2. double b,
  3. double c,
  4. double d,
  5. double tx,
  6. double ty,
)

Implementation

double blerp(double a, double b, double c, double d, double tx, double ty) =>
    lerp(lerp(a, b, tx), lerp(c, d, tx), ty);