void main( )
{
vec2 uv = vUv;
if (abs(sin(rtime*0.003*snoise(vec3(rtime*0.0003, ${fxrand()},0.))) - uv.x) > 0.2*${fxrand()} || abs(sin(rtime*0.005*snoise(vec3(${fxrand()}, rtime*0.0003,0.))) - uv.y) > 0.2*${fxrand()}) {
gl_FragColor = vec4(1.0);
} else {
gl_FragColor = vec4(0.0);
}
vec4 cvs_a = texture2D(canvas, uv+snoise(vec3(uv.x*8.0*${fxrand()}, uv.y*8.0*${fxrand()}, time*0.0003*${fxrand()}))*0.1*${fxrand()});
vec4 cvs_b = texture2D(canvas, uv+snoise(vec3(uv.x*8.0*${fxrand()}, uv.y*8.0*${fxrand()}, time*0.0003*${fxrand()}))*0.1*${fxrand()} + 0.001*${fxrand()});
vec4 cvs_c = texture2D(canvas, uv+snoise(vec3(uv.x*8.0*${fxrand()}, uv.y*8.0*${fxrand()}, time*0.0003*${fxrand()}))*0.1*${fxrand()} - 0.001*${fxrand()});
vec4 cvs = vec4(cvs_a.r, cvs_b.g, cvs_c.b, 1.0);
gl_FragColor += cvs-(0.99 + snoise(vec3(${fxrand()}, uv.x*0.3, time*0.000003))*0.01) ;
}