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20 lines
487 B
GLSL
20 lines
487 B
GLSL
#version 330
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layout (location=0) out vec4 frag_color;
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flat in vec4 color;
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in vec2 unitPosition;
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// Like smooth step, but with linear interpolation instead of s-curve.
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float linearstep(float edge0, float edge1, float x) {
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return clamp((x - edge0) / (edge1 - edge0), 0.0, 1.0);
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}
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void main(){
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float distSqr = sqrt(dot(unitPosition, unitPosition));
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float delta = fwidth(distSqr)/2;
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float alpha = linearstep(1+delta, 1-delta, distSqr);
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frag_color = color;
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frag_color.a *= alpha;
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}
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