Solari: Reduce temporal shadow lag #25046
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Per-frame GPU-written vertex/index buffers become TLAS instances via entity-keyed BLASes. Geometry BLAS builds fold into the TLAS build encoder. Geometry BLASes double-buffer (GeometryBlasEntry::previous_blas) so the previous-frame TLAS retained for temporal MIS visibility (bevyengine#25046) keeps referencing an intact BLAS instead of one rebuilt in place this frame.
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Reduce DI shadow lag (doesn't seem to do much for GI, but hard to tell) by using the previous-frame TLAS for visibility testing in MIS when merging the temporal reservoir in.
This does cost more VRAM.
Thanks to @stuartparmenter for the idea.