#version 410

uniform sampler2D waveformTexture;

in vec2 uvV; // 0..1 across the terminal window
in float alphaV;
in vec4 colorV;
in float waveformYV;

out vec4 fragColor;


void main (void)
{
    float waveValue = texture(waveformTexture, vec2(uvV.x, waveformYV)).r;
    waveValue = (waveValue + 1.0) / 2.0; // scale down -1..+1 to 0..1

    fragColor = colorV;
    
    if(uvV.y < waveValue)
        fragColor.rgb *= 0.8;
}