#version 410

in vec4 color;
in vec2 fragCoord;

out vec4 FragColor;

uniform float time;
uniform float fill;
uniform bool leftToRight;
uniform float height;

void main()
{ //Rectangle plus large que haut
    vec4 colorTemp = color;
    float ouverture = 0.8f;
    // Effet "tube"
    float lum = -pow(fragCoord.y + height/2f, 2f) * 5f /height + ouverture;
    colorTemp.xyz *= lum;

    // Effet flash sur la surface
    float flash = abs(sin(time)) + 0.4f;
    colorTemp.xyz *= flash;

    if (leftToRight){
        if (fill > fragCoord.x){
            FragColor = colorTemp;
        }
        else {
            FragColor = vec4(0f);
        }
    } else {
        if (fill < fragCoord.x){
            FragColor = colorTemp;
        }
        else {
            FragColor = vec4(0f);
        }
    }


}