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Clément Foucault bfb6ea898b DRW: View: Add base for multi-view support ...

This implements the base needed for supporting multiple view concurently
inside the same drawcall.

The view used by common macros and view related functions is indexed using
a global variable `drw_view_id` which can be set arbitrarly or read
from the `drw_ResourceID`.

This is needed for EEVEE-Next shadow but can be used for other purpose
in the future.

Note that a shader specialization is needed for it to work. `DRW_VIEW_LEN`
needs to be defined to the amount of view the shader will access.

The number of views contained in a `draw::View` is set at construction
time.

Note that the maximum number of object correctly drawn by the shaders
using multiple views will be lower than thoses who don't.

2022-11-14 11:17:38 +01:00

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