qwerty is auto probed, making HMDs that are not auto probed always take precedence.
When setting QWERTY_ENABLE=1 the intent is usually to exclusively use qwerty.
Therefore we default to disabling all other drivers when this variable is set.
To make the old behavior of adding qwerty devices with lower priority than actual
devices, the variable QWERTY_COMBINE=1 is introduced.
The hardcoded value 32 was actually wrong and caused a warning
../src/xrt/state_trackers/oxr/oxr_input.c:668:9: warning: 'oxr_binding_find_bindings_from_key' accessing 256 bytes in a region of size 128 [-Wstringop-overflow=]
668 | oxr_binding_find_bindings_from_key(log, profile, act->act_key, binding_points, &num);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
It produces a warning
../src/xrt/state_trackers/gui/gui_scene_debug.c:141:9: warning: ‘igInputFloat3’ accessing 12 bytes in a region of size 4 [-Wstringop-overflow=]
141 | igInputFloat3(name, (float *) &value.x, "%+f", ImGuiInputTextFlags_ReadOnly);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The STOPPING state has two possible follow up paths:
STOPPING -> IDLE -> READY
STOPPING -> IDLE -> EXITING
After EXITING, the application must call xrDestroySession; there is no meaningful
session state after EXITING.
To go to the READY state again, the application should first create a new session.
Applications that are lazy and drain the entire event queue and only handle
the last encountered state would be affected by "skipping" the EXITING state.
XR_KHR_vulkan_enable2:
physicalDevice VkPhysicalDevice must match the device specified by xrGetVulkanGraphicsDevice2KHR
XR_KHR_vulkan_enable:
physicalDevice VkPhysicalDevice must match the device specified by xrGetVulkanGraphicsDeviceKHR
XR_KHR_vulkan_enable:
Add a trivial check that xrGetVulkanGraphicsDeviceKHR is called before xrCreateSession.
(our cached suggested device will be XR_NULL_HANDLE if it has not been called).
The XR_KHR_vulkan_enable2 code path already contains this check.
