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EEVEE-Next: Shadow: Add LOD system to directional clipmap shadows #120031

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Clément Foucault merged 16 commits from fclem/blender:eevee-next-shadow-directional-lod into main 2024-03-29 16:23:06 +01:00
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Clément Foucault commented 2024-03-28 19:32:33 +01:00
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This act in multiple phases:

  • A shader scan the whole clipmap after tilemap finalize to gather
    where valid tiles from lower LODs are available and write the page
    location and LOD offset at invalid tiles location.

  • At sampling time we add the LOD offset before the pixel page
    modulo operation. This offset is equal to the amount of pages of
    the sampling LOD needed to have the same modulo result as the
    sampled LOD.

The whole thing being very tricky, I added a lot of unit testing.

This has no use for now but the system is needed to implement:

  • Shadows from Volumetrics at lower cost & memory footprint.
  • Fixing soft shadows artifacts.

These will be implemented in separate PRs.

This act in multiple phases: - A shader scan the whole clipmap after tilemap finalize to gather where valid tiles from lower LODs are available and write the page location and LOD offset at invalid tiles location. - At sampling time we add the LOD offset before the pixel page modulo operation. This offset is equal to the amount of pages of the **sampling** LOD needed to have the same modulo result as the **sampled** LOD. The whole thing being very tricky, I added a lot of unit testing. This has no use for now but the system is needed to implement: - Shadows from Volumetrics at lower cost & memory footprint. - Fixing soft shadows artifacts. These will be implemented in separate PRs.
Clément Foucault added this to the 4.2 LTS milestone 2024-03-28 19:32:33 +01:00
Clément Foucault added the
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 label 2024-03-28 19:32:33 +01:00
Clément Foucault added 12 commits 2024-03-28 19:32:47 +01:00
bdd645bb78 Use own ShadowSamplingTile type inside the tilemap_tx 
This allow to free some bits inside the packed structure.
These bits will be used to store LOD offsets in the future.
992c710425 Merge branch 'main' into eevee-next-shadow-directional-lod 
# Conflicts:
#	source/blender/draw/tests/eevee_test.cc
Clément Foucault added 2 commits 2024-03-29 15:35:17 +01:00
Clément Foucault added 2 commits 2024-03-29 16:21:20 +01:00
Clément Foucault merged commit 7797231c6d into main 2024-03-29 16:23:06 +01:00
Clément Foucault deleted branch eevee-next-shadow-directional-lod 2024-03-29 16:23:08 +01:00
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Reference: blender/blender#120031
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