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HydrogenMacro

Jun 9th, 2025

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Godot GLSL 3.29 KB | None | 0 0

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void main() {
fragColor = pointerColor;
float fragColorAlpha = 0.;
for (int i = 0; i < TAIL_LENGTH; i++) {
vec2 p1 = splinePointData[i].xy;
float dist = distance(p1, fragPos);
float fade = float(i) / float(TAIL_LENGTH);
float antialiasAlpha = 1. - smoothstep(POINTER_SIZE * fade, POINTER_SIZE * fade + antialias, dist);
if (antialiasAlpha != 0.) {
fragColorAlpha = max(fragColorAlpha, antialiasAlpha);
if (antialiasAlpha == 1.) return;
}
}
float m = 999999.;
float m_t = 0.;
int m_i = 0;
for (int i = 0; i < TAIL_LENGTH - 1; i++) {
vec2 p1 = splinePointData[i].xy;
vec2 p2 = splinePointData[i+1].xy;
vec2 m1 = splinePointData[i].zw;
vec2 m2 = splinePointData[i+1].zw;
vec2 spa = 2.*p1-2.*p2+m1+m2;
vec2 spb = 3.*p2-3.*p1-m2-2.*m1;
vec2 spc = m1;
vec2 spd = p1;
vec2 a = -spa;
vec2 b = -spb;
vec2 c = -spc;
vec2 d = fragPos - spd;
vec2 q = 6.*p1+3.*m1-6.*p2+3.*m2;
vec2 r = -6.*p1-4.*m1+6.*p2-2.*m2;
vec2 s = m1;
// dist diff coeffs
float dda = dot(a*q, vec2(1.));
float ddb = dot(b*q+a*r, vec2(1.));
float ddc = dot(a*s+b*r+c*q, vec2(1.));
float ddd = dot(b*s+d*q+c*r, vec2(1.));
float dde = dot(c*s+d*r, vec2(1.));
float ddf = dot(d*s, vec2(1.));
// dist 2nd diff coeffs
float d2da = 5.*dda;
float d2db = 4.*ddb;
float d2dc = 3.*ddc;
float d2dd = 2.*ddd;
float d2de = dde;
for (int search_i = 1; search_i <= int(${zetaPointerSettings.nmSearchIters}); search_i += 1) {
float k = float(search_i) / (float(${zetaPointerSettings.nmSearchIters}) + 1.);
for (int i_ = 0; i_ < ${zetaPointerSettings.nmIterations}; i_++) {
float delta = (dda * k*k*k*k*k + ddb * k*k*k*k + ddc * k*k*k + ddd * k*k + dde * k + ddf)/(d2da * k*k*k*k + d2db * k*k*k + d2dc * k*k + d2dd * k + d2de);
k = k - delta;
if (delta < 1. / pow(10., float(${zetaPointerSettings.nmEpsilon}))) {
break;
}
}
if (0. <= k && k <= 1.) {
float splineT = float(i)+k;
vec2 splinePos = spa * k*k*k + spb * k*k + spc * k + spd;
float dist = length(fragPos - splinePos);
if (dist < m) {
m = dist;
m_t = splineT;
m_i = i;
}
}
}
}
float fade = m_t/float(TAIL_LENGTH);
float antialiasAlpha = 1. - smoothstep(POINTER_SIZE * fade, POINTER_SIZE * fade + antialias, m);
if (antialiasAlpha != 0.) {
fragColorAlpha = max(fragColorAlpha, antialiasAlpha);
if (antialiasAlpha == 1.) return;
}
fragColor *= fragColorAlpha;
fragColor *= pointerColor.a;
}

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