#version 410

uniform float eyePos;
uniform float time;

in vec3 colV;
in vec3 modelPosV;
in vec3 worldPosV;
in vec3 viewPosV;
in vec3 norV;
in vec2 uvV;

out vec4 fragColor;

vec3 mf(vec3 x)
{
    return x - floor(x);
}

void main (void)
{
    vec3 nNor = normalize(norV);
    vec3 colVL = colV;
    fragColor = vec4(colVL,1);
    
    {
        // add a specular
        vec3 eyePos3 = vec3(0.0, 0.0, eyePos);
        float spec = dot(normalize(eyePos3 - viewPosV), normalize(nNor));
        spec = pow(spec,100.0);
        spec = spec * .3;
        {
        // pin specular brightness to largest of the main color components
            float specAmt = max(max(colV.r, colV.g), colV.b);
            specAmt = max(0.3, specAmt);
            spec *= specAmt;
            fragColor += vec4(spec, spec, spec, 1.0);
        }
    }
    
    {
        // some depth-dimming
        // z is negative the further it is from us.
//        if(z < 0.0)
        {
            float z = -viewPosV.z - 10.0;
            float dimming = 1.0 - z / 100.0;
            dimming = clamp(dimming, 0.1, 1.0);
            fragColor *= dimming;
        }
        
        // z stripes
//        float z = viewPosV.z;
//        z = z - floor(z);
//        z = z < 0.5 ? 0.0 : 1.0;
//        fragColor = vec4(z,z,z,1.0);
//        if(viewPosV.z < 0.0)
//            fragColor = vec4(1.0,z,z,1.0);
//        if(viewPosV.z < -5.0)
//            fragColor = vec4(1.0,1.0,z,1.0);
    }
}