gradient.frag

#version 120

void main() {
    vec4 color;
    float xCor = gl_FragCoord.x;
    
    vec4 white = vec4(1);
    vec4 black = vec4(0);

    float x = smoothstep(0, 960.0, xCor);
    color = mix(black, whites, x);
   

    gl_FragColor = color;
}