public static int stbtt__solve_cubic(float a, float b, float c, float *r)
{
var s = -a / 3;
var p = b - a * a / 3;
var q = a * (2 * a * a - 9 * b) / 27 + c;
var p3 = p * p * p;
var d = q * q + 4 * p3 / 27;
if (d >= 0)
{
var z = (float)CRuntime.sqrt(d);
var u = (-q + z) / 2;
var v = (-q - z) / 2;
u = stbtt__cuberoot(u);
v = stbtt__cuberoot(v);
r[0] = s + u + v;
return(1);
}
else
{
var u = (float)CRuntime.sqrt(-p / 3);
var v = (float)CRuntime.acos(-CRuntime.sqrt(-27 / p3) * q / 2) / 3;
var m = (float)CRuntime.cos(v);
var n = (float)CRuntime.cos(v - 3.141592 / 2) * 1.732050808f;
r[0] = s + u * 2 * m;
r[1] = s - u * (m + n);
r[2] = s - u * (m - n);
return(3);
}
}
public static int stbtt__solve_cubic(float a, float b, float c, float *r)
{
float s = (float)(-a / 3);
float p = (float)(b - a * a / 3);
float q = (float)(a * (2 * a * a - 9 * b) / 27 + c);
float p3 = (float)(p * p * p);
float d = (float)(q * q + 4 * p3 / 27);
if ((d) >= (0))
{
float z = (float)(CRuntime.sqrt((double)(d)));
float u = (float)((-q + z) / 2);
float v = (float)((-q - z) / 2);
u = (float)(stbtt__cuberoot((float)(u)));
v = (float)(stbtt__cuberoot((float)(v)));
r[0] = (float)(s + u + v);
return((int)(1));
}
else
{
float u = (float)(CRuntime.sqrt((double)(-p / 3)));
float v = (float)((float)(CRuntime.acos((double)(-CRuntime.sqrt((double)(-27 / p3)) * q / 2))) / 3);
float m = (float)(CRuntime.cos((double)(v)));
float n = (float)((float)(CRuntime.cos((double)(v - 3.141592 / 2))) * 1.732050808f);
r[0] = (float)(s + u * 2 * m);
r[1] = (float)(s - u * (m + n));
r[2] = (float)(s - u * (m - n));
return((int)(3));
}
}