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* xDisplay must be a pointer to a Display value
* glxDrawable must be a valid GLXDrawable value
* glxContext must be a valid GLXContext value

intentionally not checked:
* glxFBConfig must be a valid GLXFBConfig value
We don't care about this one for now.

This initializes default values in the display, distortion and IMU
properties so the runtime is happy in case the JSON config could not be
read.

This patch also moves default value initialization for the Index
into one place with the others, for cases we do not have the data.

This extension introduces a more robust way of creating an XrSession for
OpenGL. It also lays the groundwork for future OpenGL ES support.

https://github.com/KhronosGroup/OpenXR-Docs/pull/40Signed-off-by: Simon Ser <contact@emersion.fr>
Signed-off-by: Drew DeVault <sir@cmpwn.com>

Don't blindly cast the input struct to XrSwapchainImageOpenGLKHR, check
that the type is XR_TYPE_SWAPCHAIN_IMAGE_OPENGL_KHR.

The spec says NULL arguments are valid when the argument just exists for
extensibility. Fix the implementation to accept NULL args.

It's like OXR_VERIFY_ARG_TYPE_AND_NOT_NULL, but doesn't ensure the argument
is non-NULL.

At least until we have proper tracking for the PSVR.