#version 410

in vec2 uvV;

uniform float globalAlpha = 1.0;
// per-part settings
in vec4 colorA;
in vec4 colorB;
in float radiusLow;
in float radiusHigh;
in float alpha;
in float currentValue;

out vec4 fragColor;


// Simplest Texture render -- assign "texture1" from varying UV coords.
// Requires vertex shader with uvV output, only.
void main (void)
{
    float r = distance(vec2(0,0), uvV);
    
    if(r < radiusLow || r > radiusHigh)
        discard;
    
    float angle = atan(uvV.y, uvV.x) / (3.141592653589793238 / 2.0);
    vec4 result = angle < currentValue ? colorB : colorA;
    result.a *= alpha * globalAlpha;
    fragColor = result;
}