Clément Foucault
b1c49b3b2a
The display depth is used to composite Gpencil and Overlays. For it to be stable we bias it using the dFdx gradient functions. This makes overlays like edit mode not flicker. The previous approach to save the 1st center sample does not work anymore since we jitter the projection matrix in a looping pattern when scene is updated. So the center depth is only (almost) valid 1/8th of the times. The biasing technique, even if not perfect, does the job of being stable. This has a few cons: - it makes the geometry below the ground plane unlike workbench engine. - it makes overlays render over geometry at larger depth discontinuities.