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uniform vec4 outlineColor;
in vec4 radii;
in vec4 fillColor;
out vec4 fragColor;
void main() {
float dist = length(gl_PointCoord - vec2(0.5));
// transparent outside of point
// --- 0 ---
// smooth transition
// --- 1 ---
// pure outline color
// --- 2 ---
// smooth transition
// --- 3 ---
// pure fill color
// ...
// dist = 0 at center of point
float midStroke = 0.5 * (radii[1] + radii[2]);
if (dist > midStroke) {
fragColor.rgb = outlineColor.rgb;
fragColor.a = mix(outlineColor.a, 0.0, smoothstep(radii[1], radii[0], dist));
}
else
fragColor = mix(fillColor, outlineColor, smoothstep(radii[3], radii[2], dist));
}
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