Fix stereoscopic render layer cachingHEADmaster

Layer caching for stereoscopic rendering doesn't work, because
1) the layer has only one texture for the left and right eyes and
   it renders both eyes with the same texture thereby overwriting
   the left eye.
2) the stereoscopic cameras are always dirty causing it to always render.

This patch adds second layer texture allowing the caching of both eyes
and also fixes the dirty camera problem by using the main camera to
calculate the camera dirty flags and stores them for the right eye so
that it also renders when left eye was dirty.

Task-number: QT3DS-4239
Change-Id: Ice46bb4828418eca628abcbb7bb6d21aacf48028
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>
Reviewed-by: Janne Koskinen <janne.p.koskinen@qt.io>

0 files changed, 0 insertions, 0 deletions