ogre
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implement clustered forward rendering
references:
- RTShaderSRSSegmentedLights Sample
- https://forums.ogre3d.org/viewtopic.php?t=48412
- https://www.aortiz.me/2018/12/21/CG.html
- https://github.com/OGRECave/ogre-next/blob/08e9d74994681a6f04ea6f3cb2a44aeae23670f2/OgreMain/src/OgreForward3D.cpp#L126
- https://github.com/google/filament/blob/7d80975c3cec617c274640fe2813f726770696bb/filament/src/Froxelizer.cpp#L325