precision mediump float;
    uniform sampler2D u_image; // our texture
    uniform float time;

    uniform vec2 u_mouse;
    
    float frequency=30.0;
    float amplitude=0.01;
    float speed=0.01;
    float divisoresX=600.0;
    float divisoresY=300.0;
        
    
    uniform lowp float pixelWidth;
    uniform lowp float pixelHeight;
    
    uniform mediump float dotsx;
    uniform mediump float dotsy;
    // the texCoords passed in from the vertex shader.
    varying vec2 v_texCoord;
    varying mediump vec2 vTex;

    void main() {  
        float distortionX= v_texCoord.x + sin(v_texCoord.y*frequency + time*speed)*amplitude * 1.0;
        float distortionY= v_texCoord.y + sin(v_texCoord.x*frequency + time*speed)*amplitude * 1.0;
        //float distortionX= v_texCoord.x + (v_texCoord.x*frequency) + (time*speed*amplitude);
        //float distortionY= v_texCoord.y + (v_texCoord.y*frequency) + (time*speed*amplitude);
        
        // Mouse parallax
        vec2 parallax=u_mouse*0.01;
        vec2 distortedPosition=vec2(distortionX, distortionY);
        vec4 color = texture2D(u_image, distortedPosition+parallax);
        float entro=0.0;
        if(mod((distortionX),(1.0/divisoresX)*5.0)>1.0/divisoresX ){
            color= vec4(0,0,0,0.2);
            entro=1.0;
            gl_FragColor = color;
        }
        else if(mod((distortionY),(1.0/divisoresY)*4.0)>1.0/divisoresY){
            color= vec4(0,0,0,0.2);
            entro=1.0;
            gl_FragColor = color;
        }else if(entro==0.0 && color.w > 0.1){

            color=vec4(color.x,color.y,color.z,0.04); 
            gl_FragColor = color;
        }
        
        //l_FragColor = color;
    }