Commits on Feb 5, 2016

1. Add support for GPU generated raster ops to have texture atlas border… …

   … edges.
   
   Raster ops are now generated to a single render target (per format) allocated at start up.
   
   After a raster batch is rendered, it is then blitted into the atlas, along with border edges if requested.
   
   This is necessary since it's not possible to read from a texture bound as a render target.
   
   This fixes several artifacts that are often noticeable with box-shadow etc.
   
   Also fix a couple of warnings.

   

   gw3583 committed Feb 5, 2016
   8d2fc42