Add an env var to periodically kill the device on d3d

...in order to test the handling of losing the device.

The D3D11 backend of QRhi provides a convenient way to test this.
Hook it up to a QSG_RHI_SIMULATE_DEVICE_LOSS environment variable.
The value is the number of frames to wait before breaking the
ID3D11Device.

We cannot currently recover from a device loss. Hence the importance
of being able to test in a simple way. The rhi code path needs to be
brought up to the level of the direct OpenGL path in this respect,
in separate patches.

Change-Id: I66d6315dc60a9673903da9bed36de0cdd115f4a7
Reviewed-by: Christian Strømme <christian.stromme@qt.io>

0 files changed, 0 insertions, 0 deletions