local W,H = 1024, 1024
local tex =  Texture(1024, 1024, ETF_A8R8G8B8)

local length = W*H
local img = ffi.new("unsigned char[?]", length)

local rect = Rect(0, 0, W, H)
local r = math.random

hook.Add("PostDrawMenu", "draw_texture_noise", function()
    for i = 0, length-1 do
        img[i+0] = r(255)
        img[i+1] = r(255)
        img[i+2] = r(255)
        img[i+3] = 255
    end

    tex:SetData(img)

    rect.x, rect.y = mouse.GetPos()

    graphics.Set2DFlags()
    graphics.DrawTexture(tex, rect, nil, nil, true)
end)