CMake: tvOS support/fixes

To use, set the following CMake variables when running CMake's configuration stage:
- CMAKE_SYSTEM_NAME=tvOS
- CMAKE_OSX_SYSROOT=<SDK>  (examples: appletvos, appletvsimulator, appletvos12.4, /full/path/to/AppleTVOS.sdk, etc.)
- CMAKE_OSX_ARCHITECTURES=<semicolon-separated list of CPU architectures> (example: "arm64;x86_64")

CMakeLists.txt

@@ -118,6 +118,8 @@ elseif(APPLE)
     set(DARWIN TRUE)
   elseif(CMAKE_SYSTEM_NAME MATCHES ".*MacOS.*")
     set(MACOSX TRUE)
+  elseif(CMAKE_SYSTEM_NAME MATCHES ".*tvOS.*")
+    set(TVOS TRUE)
   endif()
   # TODO: iOS?
 elseif(CMAKE_SYSTEM_NAME MATCHES "BeOS.*")
@@ -159,7 +161,7 @@ endif()
 #  so we'll just use libusb when it's available. libusb does not support iOS,
 #  so we default to yes on iOS.
 #  TODO: Windows can support libusb, the hid.c file just depends on Unix APIs
-if(WINDOWS OR IOS OR ANDROID)
+if(WINDOWS OR IOS OR TVOS OR ANDROID)
   set(HIDAPI_SKIP_LIBUSB TRUE)
 else()
   set(HIDAPI_SKIP_LIBUSB FALSE)
@@ -1449,7 +1451,7 @@ elseif(APPLE)
   # !!! FIXME: we need Carbon for some very old API calls in
   # !!! FIXME:  src/video/cocoa/SDL_cocoakeyboard.c, but we should figure out
   # !!! FIXME:  how to dump those.
-  if(NOT IOS)
+  if(DARWIN OR MACOSX)
     set(SDL_FRAMEWORK_COCOA 1)
     set(SDL_FRAMEWORK_CARBON 1)
   endif()
@@ -1483,15 +1485,17 @@ elseif(APPLE)
   if(SDL_JOYSTICK)
     CheckHIDAPI()
     if(HAVE_HIDAPI)
-      if(IOS)
+      if(IOS OR TVOS)
         set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/hidapi/ios/hid.m)
         set(SDL_FRAMEWORK_COREBLUETOOTH 1)
       endif()
     endif()
-    if (IOS)
+    if(IOS OR TVOS)
       file(GLOB JOYSTICK_SOURCES ${SDL2_SOURCE_DIR}/src/joystick/iphoneos/*.m ${SDL2_SOURCE_DIR}/src/joystick/steam/*.c)
       set(SDL_JOYSTICK_MFI 1)
+      if(IOS)
         set(SDL_FRAMEWORK_COREMOTION 1)
+      endif()
       set(SDL_FRAMEWORK_GAMECONTROLLER 1)
       set(HAVE_SDL_SENSORS 1)
     else()
@@ -1505,7 +1509,7 @@ elseif(APPLE)
   endif()
 
   if(SDL_HAPTIC)
-    if (IOS)
+    if (IOS OR TVOS)
       file(GLOB HAPTIC_SOURCES ${SDL2_SOURCE_DIR}/src/haptic/dummy/*.c)
       set(SDL_HAPTIC_DUMMY 1)
     else()
@@ -1522,7 +1526,7 @@ elseif(APPLE)
   endif()
 
   if(SDL_POWER)
-    if (IOS)
+    if (IOS OR TVOS)
       file(GLOB POWER_SOURCES ${SDL2_SOURCE_DIR}/src/power/uikit/*.m)
       set(SDL_POWER_UIKIT 1)
     else()
@@ -1561,7 +1565,7 @@ elseif(APPLE)
 
   # iOS hack needed - http://code.google.com/p/ios-cmake/ ?
   if(SDL_VIDEO)
-    if (IOS)
+    if (IOS OR TVOS)
       set(SDL_VIDEO_DRIVER_UIKIT 1)
       set(SDL_FRAMEWORK_COREGRAPHICS 1)
       set(SDL_FRAMEWORK_QUARTZCORE 1)
@@ -1581,7 +1585,7 @@ elseif(APPLE)
     endif()
 
     if(VIDEO_OPENGLES)
-      if(IOS)
+      if(IOS OR TVOS)
         set(SDL_FRAMEWORK_OPENGLES 1)
         set(SDL_VIDEO_OPENGL_ES 1)
         set(SDL_VIDEO_RENDER_OGL_ES 1)
@@ -1687,7 +1691,7 @@ elseif(APPLE)
     list(APPEND EXTRA_LIBS ${GAMECONTROLLER})
   endif()
   if(SDL_FRAMEWORK_METAL)
-    if(IOS)
+    if(IOS OR TVOS)
       find_library(METAL Metal)
       list(APPEND EXTRA_LIBS ${METAL})
     else()
@@ -1699,7 +1703,7 @@ elseif(APPLE)
     list(APPEND EXTRA_LIBS ${OPENGLES})
   endif()
   if(SDL_FRAMEWORK_QUARTZCORE)
-    if(IOS)
+    if(IOS OR TVOS)
       find_library(QUARTZCORE QuartzCore)
       list(APPEND EXTRA_LIBS ${QUARTZCORE})
     else()
@@ -1960,7 +1964,7 @@ if(SDL_SHARED)
   if (NOT ANDROID)
     set_target_properties(SDL2 PROPERTIES DEBUG_POSTFIX ${SDL_CMAKE_DEBUG_POSTFIX})
   endif()
-  if(IOS)
+  if(IOS OR TVOS)
     set_property(TARGET SDL2 APPEND_STRING PROPERTY COMPILE_FLAGS "-fobjc-arc")
     target_compile_definitions(SDL2 PRIVATE IOS_DYLIB=1)
   endif()
@@ -2006,7 +2010,7 @@ if(SDL_STATIC)
   if (NOT ANDROID)
     set_target_properties(SDL2-static PROPERTIES DEBUG_POSTFIX ${SDL_CMAKE_DEBUG_POSTFIX})
   endif()
-  if(IOS)
+  if(IOS OR TVOS)
     set_property(TARGET SDL2-static APPEND_STRING PROPERTY COMPILE_FLAGS "-fobjc-arc")
   endif()
 endif()