local rt = util.RemoveOldObject(Texture(512, 512, FT_USAGE_RENDERTARGET))

-- this won't really do anything unless it's a normal texture
--[[
local img = rt:GetPixelTable(true)

for i = 0, rt:GetLength() do
    img[i].r = i%255
    img[i].g = (math.sin((i)/10000)*1000)%255
    img[i].b = math.cos(i*255)%255
    img[i].a = 90
end

rt:SetPixelTable(img)]]

hook.Add("PostHUDUpdate", "rt_test", function()
    -- start rt
    --render.RenderBegin()
    render.SetRenderTarget(rt, SRF_USE_ORIG_DEPTHBUF)

        -- draw a rect onto the RT texture
        graphics.DrawRect(Rect(0,0,10,10), Color(math.random(), math.random(), math.random(), 1))

    -- end rt
    --render.EndFrame()
    render.SetRenderTarget(nil, SRF_USE_ORIG_DEPTHBUF)

    -- draw the results following our mouse pos
    local x,y = mouse.GetPos()
    graphics.DrawTexture(rt, Rect(x,y,256,256), Color(1,1,1,1))
end)

util.MonitorFileInclude()