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