#version 300 es

/*this will affect all the float guys (float, vecN, matN )*/
precision mediump float;

in vec3 fragPos;  //vertice in coordinata del mondo
in vec3 fragNormal;
in vec2 frag_uv;  //coordinate 2d di texure
in vec3 fragBoundPos;
in vec3 fragBaryc;
/* does gles2 already includes it and considers it a redeclaration
in vec4 gl_FragCoord;
*/

in mat3 TBN;

uniform vec3 lightCol;
uniform vec3 lightPos;
uniform vec3 eyePos;
uniform float time;


//uniform vec3 diffuseColor;
uniform sampler2D colorMap;   //campionatore 2d 
uniform sampler2D normalMap;   //campionatore 2d 

out vec4 FragColor;
/*
int nScanLines = 16;
*/
float f_nScanLines = 16.0;

float PI = 3.14159265358979323846264338327950288;


float illuminazione(vec3 lucePos, vec3 fragPos, vec3 eyePos, vec3 fragNormal){
    fragNormal = normalize(fragNormal);
       
    vec3 aLuceDir = normalize(lucePos - fragPos);
    vec3 allOcchioDir = normalize(eyePos - fragPos);
    float lightDistance = length(lucePos - fragPos);
    vec3 rimbalzoDir = - normalize(reflect(aLuceDir,fragNormal));
    float attenuation = 1.0f / (0.01 * lightDistance);
        
    float diffuseFactor = max(dot(aLuceDir, fragNormal), 0.0);
        
    float specularFactor = pow(max(dot(rimbalzoDir, allOcchioDir), 0.0), 100.0f);
        
    return attenuation * ( specularFactor + diffuseFactor);  
}

void main()
{   

    vec4 texColor = texture(colorMap,frag_uv);
    vec3 normalPix = texture(normalMap,frag_uv).rgb;
    normalPix = normalPix * 2.0 - 1.0;   
    normalPix = normalize(TBN * normalPix); 

    float sinExp = 500.0 * (0.05 + 0.95 * sin( 3.14159265359 * 0.25 * (time * time)));
    //float sinExp = 500.0;
    float clampBound = 0.25;

    vec3 result = 0.7 * vec3(1,0.5,1);
    float locy = fragBoundPos.y;
    locy = mod(locy, 1.0f / f_nScanLines);
    float dist = abs(pow(locy - (time / f_nScanLines), 0.1));
    float glowFac = (1.0 / clampBound) * abs(clamp(
                    pow(sin(dist * PI), sinExp), -clampBound, clampBound));

    float scrDist = sin( PI * ( 1.0 - clamp(pow(gl_FragCoord.z , 100.0), 0.0, 1.0)));
    result *= scrDist;
    FragColor = vec4(result, 1.0f);
    FragColor*=glowFac;
    //FragColor = vec4(abs(fragNormal.x) * glowFac ,abs(fragNormal.y) * glowFac , abs(fragNormal.z) * glowFac , 1.0f * scrDist);
    
	float baryThreshold = 0.05f;
	if(fragBaryc.x > baryThreshold && fragBaryc.y > baryThreshold && fragBaryc.z > baryThreshold) {
        FragColor = vec4(0.05 * FragColor.xyz, 0);
    }
}