This driver should sunset the old gl2 driver, but that driver will
likely live on to support really ancient and terrible GL stacks.
All the worst legacy cruft has been ripped out, and it's almost a decent
backend now.
Requirements for slang are GL 3.2+ or GLES3.
Some shaders require features which are not directly compatible with
GLES2 or legacy GL.
This driver shares a lot of concepts from the Vulkan driver.
The slang shader stack and SPIRV-Cross are used to implement the shader
spec, and the menu shaders are also shared with Vulkan.
Only normal Debug/Release config will compile, not with QT/CG
Tested in Windows 10 on ARM and Windows RT
Cores can be compiled with platform=windows_msvc2017_desktop_arm
iOS: change default joypad driver to be mfi
iOS: move autodetect of mfi controller to mfi_joypad driver and set the default mapping for both iOS and tvOS
iOS: support unsupported buttons on mfi controller (select,L3,R3) by using hotkey combinations using the MENU button
tvos: use INPUT_TOGGLE_DOWN_Y_L_R as default for menu toggle gamepad combo
- add tvOS target
- support code signing tvOS cores by adding an argument to the code signing cores script
- use NSCachesDirectory for the documents directory
- add some mfi controller handling logic to set non-game controllers to the last index to avoid interfering with operation
- autodetect mfi controller for apple tv on startup - added autodetect to hid joypad
- added a webserver to transfer files for tvOS
- xcode: clean up project, remove unused folders
- remove HAVE_MATERIALUI setting for tvos build, make it use XMB as default
- added retroarch app icon courtesy of @MrJs
- added auto-detect of mfi controller for apple tv
