void main(){
    //this is the fragment shader
    //this is where the pixel level drawing happens
    //gl_FragCoord gives us the x and y of the current pixel its drawing

    //we use the mod function to only draw pixels if they are every 2 in x or every 4 in y
    if( mod(gl_FragCoord.x, 2.0) <= 0.5 && mod(gl_FragCoord.y, 4.0) <= 0.5 ){
        gl_FragColor = gl_Color;
    }

}