physarum/vendor/gioui.org/shader/gio/zstencil.vert.0.glsl100es

#version 100

struct m3x2
{
    vec3 r0;
    vec3 r1;
};

struct Block
{
    vec4 transform;
    vec2 pathOffset;
};

uniform Block _block;

attribute vec2 from;
attribute vec2 ctrl;
attribute vec2 to;
attribute float maxy;
attribute float corner;
varying vec2 vFrom;
varying vec2 vCtrl;
varying vec2 vTo;

vec3 transform3x2(m3x2 t, vec3 v)
{
    return vec3(dot(t.r0, v), dot(t.r1, v), dot(vec3(0.0, 0.0, 1.0), v));
}

void main()
{
    vec2 from_1 = from + _block.pathOffset;
    vec2 ctrl_1 = ctrl + _block.pathOffset;
    vec2 to_1 = to + _block.pathOffset;
    float maxy_1 = maxy + _block.pathOffset.y;
    float c = corner;
    vec2 pos;
    if (c >= 0.375)
    {
        c -= 0.5;
        pos.y = maxy_1 + 1.0;
    }
    else
    {
        pos.y = min(min(from_1.y, ctrl_1.y), to_1.y) - 1.0;
    }
    if (c >= 0.125)
    {
        pos.x = max(max(from_1.x, ctrl_1.x), to_1.x) + 1.0;
    }
    else
    {
        pos.x = min(min(from_1.x, ctrl_1.x), to_1.x) - 1.0;
    }
    vFrom = from_1 - pos;
    vCtrl = ctrl_1 - pos;
    vTo = to_1 - pos;
    pos = (pos * _block.transform.xy) + _block.transform.zw;
    m3x2 param = m3x2(vec3(1.0, 0.0, 0.0), vec3(0.0, 1.0, 0.0));
    vec3 param_1 = vec3(pos, 0.0);
    gl_Position = vec4(transform3x2(param, param_1), 1.0);
}