'Dual depth peeling in transparency

im doing a trasparency project now i have to implement depth peeling

so i looked up for some resources to start implementing the algorithm and i found this link

there is some things i don't understand in the algorithem for example what exactly is

lastFrontPeel and lastDepthPeel

and should i do this algorithem for every single pixle in my mesh moodels????

answering this questions would help alot thnx in advance

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