Mathias Agopian dad814e046 Fix a long standing bug preventing the use of transparent views (#1893) ...

Fix #1165

In order to use transparent views, post-processing had to be disabled
because we were not able to blit post-processed buffers with blending.
This is now fixed by simply reverting to a quad.

A side effect of this, is improved performance when a scaling blit is
needed when MSAA is active.


This also introduced new "bugs", or at least weird behaviors: the
system needs to know when blending is needed, and this has to be
based on heuristics (unless we add a new api). Currently the heuristic
is that the COLOR buffer is not discarded and the view is cleared with 
an alpha value (or not cleared).

2019-11-19 14:05:22 -08:00

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