test

void mainImage(out vec4 fragColor, in vec2 fragCoord)
{
// Normalized pixel coordinates (from 0 to 1).
vec2 uv = fragCoord / iResolution.xy;

// Output to screen as (r, g, b, alpha). fragColor = vec4(uv.x, uv.y, 0.0, 1.0);

}

Some more text…