Sampling multisampled 2d texture

sampling_multisampled_2dtexture.wgsl

struct FragmentOutput {
    [[location(0)]] out_color: vec4<f32>;
};

[[block]]
struct Data {
    time: f32;
};

[[group(0), binding(0)]]
var tex: texture_multisampled_2d<f32>;
[[group(0), binding(1)]]
var tex_sampler: sampler;
[[group(0), binding(2)]]
var<uniform> uniforms: Data;

[[stage(fragment)]]

fn main(
    [[location(0)]] tex_coords: vec2<f32>,
) -> FragmentOutput {
    
    let tex_size: vec2<i32> = textureDimensions(tex);

    // oscillate the x coord
    let waved_x = tex_coords.x + sin((uniforms.time + tex_coords.y) * 19.0) * 0.02;
    let tex_x: i32 = i32(f32(tex_size.x) * waved_x);
    let tex_y: i32 = i32(f32(tex_size.y) * tex_coords.y);
    // Get the integer tex coordinates.
    let itex_coords: vec2<i32> = vec2<i32>(tex_x, tex_y);

    // Average the pixels with its neighbours
    var color: vec4<f32> = vec4<f32>(0.0, 0.0, 0.0, 0.0);
    color = color + textureLoad(tex, itex_coords, 0);
    color = color + textureLoad(tex, itex_coords, 1);
    color = color + textureLoad(tex, itex_coords, 2);
    color = color + textureLoad(tex, itex_coords, 3);
    color = color * 0.25;


    // If I try to sample the texture using:
    color = textureSample(tex, tex_sampler, tex_coords);
    // I get the error:
    // thread 'main' panicked at 'wgpu error: Validation Error

    // Caused by:
    //     In Device::create_shader_module
    //     note: label = `shaders/cleaned.wgsl`
    //     Entry point main at Fragment is invalid
    //     Expression [52] is invalid
    //     Unable to operate on image class Sampled { kind: Float, multi: true }

    return FragmentOutput(color);
}