Phi (φ)

0 = -1x² + -1xy + -1y²

-1α² + -1αβ + -1β²

JSON: { "2,0": "-1", "1,1": "-1", "0,2": "-1" }

calc: -1*x^2 + -1*x*y + -1*y^2

GLSL: -1.0*x*x+-1.0*x*y+-1.0*y*y