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#version 120
uniform float radius;
uniform vec2 halfSize;
uniform vec2 centerPos;
uniform float smoothness;
varying vec4 color;
float roundedBoxSDF(vec2 CenterPosition, vec2 Size, float Radius) {
return length(max(abs(CenterPosition)-Size+Radius,0.0))-Radius;
}
void main() {
float distance = roundedBoxSDF(gl_FragCoord.xy - centerPos, halfSize, radius);
float smoothedAlpha = smoothstep(-smoothness,0.0, -distance);
gl_FragColor = color * vec4(1.0, 1.0, 1.0, smoothedAlpha);
}
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