Implement R5G6B5 framebuffer present.

Bug 20891368

Change-Id: If4b0b84d141eb16c96600b7ade98a552e5f2ad0e
Reviewed-on: https://swiftshader-review.googlesource.com/3251
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Nicolas Capens <capn@google.com>
1 file changed