On some platforms e.g. gbm the concept of front buffer does not really exist, in such case dri_screen->image.loader->getBuffers would return us only __DRI_IMAGE_BUFFER_BACK when we request both.
Fix this by creating internal front buffer if we requested front buffer but didn't get one. Gallium has on demand front buffer creating so it doesn't have such issue.
Current implementation handles:
- Resizes
- Multisampling
In the CI several tests start passing and several tests start failing instead of crashing https://mesa-ci.01.org/global_logic/builds/236/group/63a9f0ea7bb98050796b649e85481845