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Iris Docs

begin

Required stages: vertex, fragment
Optional stages: geometry, compute
Output buffers: colortex
Valid suffixes: no suffix, 1-99

An Iris-exclusive composite-style pass that runs before the shadow pass. It’s intended to be used for setting up any data that is needed for the shadow pass. Like other composite-style programs, it renders a single fullscreen quad over the resolution of the buffer(s) it writes to.