[FIX]RetroArch CRASH on Metal internal assert
_validateGetBytes:39: failed assertion `texture must not be a
framebufferOnly texture.' GPU Capture were done on a
framebufferOnly texture. Fix it by setting framebufferOnly
CAMetalLayer property to NO. Subsequent MTLTexture inherits from
this property.
[FIX]Capture black frames. Resulting PNG screenshots were black.
Since GPU texture where not sync with CPU,
getBytes:bytesPerRow:fromRegion:mipmapLevel: behavior is undefined
Fix it by adding synchronizeResource command to blitCommandEncoder
In order to keep performances, syncing is done ONLY when a GPU
Capture is requested.
[FIX]Corrupted image due to incorrect viewport copy
Modify code in charge of copying MTLTexture bytes to 24bits PNG
buffer.
* OSD message background
* clear glui background
* add Metal to configuration
* added optional config to compile Metal build without OpenGL
* fixed fill_pathname_join_delim; if out_path and dir are same, don't
strlcpy, as the results are undefined.