godot/thirdparty/msdfgen/core/equation-solver.h

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#pragma once
namespace msdfgen {
// ax^2 + bx + c = 0
int solveQuadratic(double x[2], double a, double b, double c);
// ax^3 + bx^2 + cx + d = 0
int solveCubic(double x[3], double a, double b, double c, double d);
}