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Clément Foucault 6306d747b7 DRW: Split ViewProjectionMatrix in order to increase precision ...

This also removes the need to compute the persmat and saves some memory
from the `ViewInfos` struct. This is needed to allow multiview support.

Initial testing found no major performance regression during vertex
heavy workload.

Test file: {F13610017}

Results:
| Platform | Master | Split Matrix|
| Linux + Mesa + AMD W6600 | 48 fps | 47 fps |
| Macbook Pro M1 | 50 fps | 51 fps |
| Linux + NVidia 1080Ti | 51 fps | 52 fps |
| Linux + Radeon Vega 64 | 25.6 fps | 26.7 fps |

Increased precision when far from origin:
{F13610024}

{F13610025}

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D16125

2022-10-05 20:29:12 +02:00

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