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#version 120
uniform float radius;
uniform vec2 halfSize;
uniform vec2 centerPos;
uniform float smoothness;
varying vec4 color;
vec3 hsv2rgb(vec3 c)
{
vec4 K = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
vec3 p = abs(fract(c.xxx + K.xyz) * 6.0 - K.www);
return c.z * mix(K.xxx, clamp(p - K.xxx, 0.0, 1.0), c.y);
}
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 = vec4(hsv2rgb(color.rgb), color.a) * vec4(1.0, 1.0, 1.0, smoothedAlpha);
}
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