haʊˈɛvɚ ðɪs kˌælkjʊlˈeɪʃən ˈoʊnli nˈiːdz təbi pɚfˈɔːɹmd wˈʌns fɚðə hˈoʊl pˈɪksəl ɹᵻɡˈɑːɹdləs ʌv hˌaʊ mˈɛni sˈæmpəl pəzˈɪʃənz ɑːɹ kˈʌvɚd; ðə ɹɪzˈʌlt ʌvðə ʃˈeɪdɪŋ kˌælkjʊlˈeɪʃən ɪz sˈɪmpli ɐplˈaɪd tʊ ˈɔːl ʌvðə ɹˈɛlᵻvənt mˈʌltaɪ sˈæmpəl loʊkˈeɪʃənz.
However this calculation only needs to be performed once for the whole pixel regardless of how many sample positions are covered; the result of the shading calculation is simply applied to all of the relevant multi sample locations.