commonMain.phraseSimplex31_shader.kt Maven / Gradle / Ivy

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package org.openrndr.shaderphrases.phrases
const val phraseSimplex31 = """#pragma import phraseHash33;

float simplex31(vec3 p) {
    const float K1 = 0.333333333;
    const float K2 = 0.166666667;

    vec3 i = floor(p + (p.x + p.y + p.z) * K1);
    vec3 d0 = p - (i - (i.x + i.y + i.z) * K2);

    // thx nikita: https://www.shadertoy.com/view/XsX3zB
    vec3 e = step(vec3(0.0), d0 - d0.yzx);
    vec3 i1 = e * (1.0 - e.zxy);
    vec3 i2 = 1.0 - e.zxy * (1.0 - e);

    vec3 d1 = d0 - (i1 - 1.0 * K2);
    vec3 d2 = d0 - (i2 - 2.0 * K2);
    vec3 d3 = d0 - (1.0 - 3.0 * K2);

    vec4 h = max(0.6 - vec4(dot(d0, d0), dot(d1, d1), dot(d2, d2), dot(d3, d3)), 0.0);
    vec4 n = h * h * h * h * vec4(dot(d0, hash33(i)), dot(d1, hash33(i + i1)), dot(d2, hash33(i + i2)), dot(d3, hash33(i + 1.0)));
    return dot(vec4(31.316), n);
}"""