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varying vec4 color;
varying vec2 p1, p2;
varying vec2 pos;
uniform float thickness;
void main() {
// thanks to https://www.youtube.com/watch?v=PMltMdi1Wzg
// (calculates distance to line segment p1-p2)
float h = clamp(dot(pos-p1, p2-p1) / dot(p2-p1, p2-p1), 0.0, 1.0);
float d = length(pos - p1 - (p2-p1) * h);
float v = max(thickness - d, 0.0);
v /= thickness;
v *= v;
gl_FragColor = color * v;
}
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