Blender Git Loki

Fix too dark rendering on the Monado runtime

Just like the Windows Mixed Reality runtime, we have to apply a sRGB
OETF to get visually correct-ish looking colors.
We plan to further investigate if it's really WMR and Monado being wrong
here, or if it's Oculus (which doesn't need this additional transform),
but there are some details to check.

Refactor GPU viewport onscreen drawing for "upside down" drawing

Reduces code duplication for the DirectX specific upside down drawing.
Didn't actually test the upside down drawing, since I need to do that on
Windows.

Merge branch 'master' into soc-2019-openxr

Correct/remove disabled code for space conversion

Turns out we don't actually have to convert between spaces.

Cleanup: Avoid duplication of projection matrix calculation

Improve error messages & cleanup

Wrap WM XR data into own struct

Revert accidental change in previour commit

Played around with the color management/transforms but forgot to undo.

Support VR Session settings & add some basic ones

* Adds the needed bits to support VR session settings and access them in
the VR view drawing code.
* Added settings for: shading mode, grid floor, annotations, clipping.
More can easily be added.
* The Add-on adds a "VR" tab in the side bar, containing buttons for the
added settings

Merge branch 'master' into soc-2019-openxr

Fix compile error on Windows after last commit

Strictly follow specification to get OpenXR extension functions

This fixes linking errors with the Monado runtime. The specification
says that extension functions have to be gotten through
`xrGetInstanceProcAddr()` which we did for some extensions, but not for
the graphics extensions. Worked fine earlier, but broke meanwhile.

Merge branch 'master' into soc-2019-openxr

Cleanup: Don't pass unused lens value

Cleanup: Comment style

CMake: Slight adjustment to warning message

Fix Linux linker config name for the OpenXR-SDK

Fix mistakes in openxr build options

I remember merge conflicts here.

Merge branch 'master' into soc-2019-openxr

Merge branch 'master' into soc-2019-openxr