Blender Git Loki

Merge branch 'master' into soc-2019-openxr

Merge branch 'master' into soc-2019-openxr

Don't drwa relationship lines in the VR view

Merge branch 'master' into soc-2019-openxr

Add Oculus to the list of known runtimes

With this, all currently available runtimes are in the runtime map. So
removing the TODO comment.

Cleanup: Refactor (hacky) swapchain image submission

Code now assumes that the view-draw callback left the OpenGL state for
ongoing use by Ghost-XR. So the state doesn't have to be set by the
swapchain image submission and thus it we don't need to pass the Ghost
OpenGL context to it in a hacky way.
Also, rename drawViewEnd (to submitToSwapchain) and remove
drawViewBegin.

Fix warning in release builds

Own FBO for VR viewport to get previous changes to work

Avoid OpenGL context deactivation, just to reactivate it immediately

Remove hack to resize the usable default framebuffer region

Remove blitting from default framebuffer

Add Monado to the list of known runtimes

Merge branch 'master' into soc-2019-openxr

Avoid redundant framebuffer resize and offscreen texture drawing

Cleanup: Add comments

Address and remove some TODOs marked in code

Cleanup: Unused functions, add comments, sync to master

Improve batch file text for starting Blender with Oculus support

Don't create a DirectX swap-chain

We only render offscreen anyway. There's no point in creating a
swap-chain. This simplifies things quite a bit.

DirectX: Create an own render-target, don't use swapchain for blitting