Frag - Hexagon

frag_hexagon.swift

let hexagon = MetalPIX(res: particleRes, uniforms: [
    MetalUniform(name: "resx", value: LiveFloat(particleRes.width)),
    MetalUniform(name: "resy", value: LiveFloat(particleRes.height))
    ], code:
    """
    int x = int(u * in.resx);
    int y = int(v * in.resy);
    int i = y * int(in.resx) + x;
    float f = float(i) / (in.resx * in.resy);
    int hexi = int(f * 6);
    float hexf1 = float(hexi) / 6 + 1.0 / 12;
    float hexf2 = float(hexi + 1) / 6 + 1.0 / 12;
    float2 p1 = float2(cos(hexf1*pi*2), sin(hexf1*pi*2));
    float2 p2 = float2(cos(hexf2*pi*2), sin(hexf2*pi*2));
    float hexif = (f * 6) - floor(f * 6);
    float2 p = p1 * (1.0 - hexif) + p2 * hexif;
    pix = float4(p.x/2+0.5,p.y/2+0.5,0,1);
    """
)