Accepted patch https://github.com/microsoft/vcpkg/blob/master/ports/sdl2/enable-winrt-cmake.patch

CMakeLists.txt

@@ -5,6 +5,18 @@ endif()
 cmake_minimum_required(VERSION 3.0.0)
 project(SDL2 C CXX)
 
+if(WINDOWS_STORE)
+  enable_language(CXX)
+  cmake_minimum_required(VERSION 3.11)
+  add_definitions(-DSDL_BUILDING_WINRT=1 -ZW)
+  link_libraries(
+    -nodefaultlib:vccorlib$<$<CONFIG:Debug>:d>
+    -nodefaultlib:msvcrt$<$<CONFIG:Debug>:d>
+    vccorlib$<$<CONFIG:Debug>:d>.lib
+    msvcrt$<$<CONFIG:Debug>:d>.lib
+  )
+endif()
+
 # !!! FIXME: this should probably do "MACOSX_RPATH ON" as a target property
 # !!! FIXME:  for the SDL2 shared library (so you get an
 # !!! FIXME:  install_name ("soname") of "@rpath/libSDL-whatever.dylib"
@@ -1367,6 +1379,11 @@ elseif(WINDOWS)
   file(GLOB CORE_SOURCES ${SDL2_SOURCE_DIR}/src/core/windows/*.c)
   set(SOURCE_FILES ${SOURCE_FILES} ${CORE_SOURCES})
 
+  if(WINDOWS_STORE)
+    file(GLOB WINRT_SOURCE_FILES ${SDL2_SOURCE_DIR}/src/core/winrt/*.c ${SDL2_SOURCE_DIR}/src/core/winrt/*.cpp)
+    list(APPEND SOURCE_FILES ${WINRT_SOURCE_FILES})
+  endif()
+
   if(MSVC)
     # Prevent codegen that would use the VC runtime libraries.
     set_property(DIRECTORY . APPEND PROPERTY COMPILE_OPTIONS "/GS-")
@@ -1416,6 +1433,9 @@ elseif(WINDOWS)
     check_include_file(ddraw.h HAVE_DDRAW_H)
     check_include_file(dsound.h HAVE_DSOUND_H)
     check_include_file(dinput.h HAVE_DINPUT_H)
+    if(WINDOWS_STORE OR VCPKG_TARGET_TRIPLET MATCHES "arm-windows")
+      set(HAVE_DINPUT_H 0)
+    endif()
     check_include_file(dxgi.h HAVE_DXGI_H)
     if(HAVE_D3D_H OR HAVE_D3D11_H OR HAVE_DDRAW_H OR HAVE_DSOUND_H OR HAVE_DINPUT_H)
       set(HAVE_DIRECTX TRUE)
@@ -1434,18 +1454,20 @@ elseif(WINDOWS)
   check_include_file(sensorsapi.h HAVE_SENSORSAPI_H)
 
   if(SDL_AUDIO)
+    if(NOT WINDOWS_STORE)
     set(SDL_AUDIO_DRIVER_WINMM 1)
     file(GLOB WINMM_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/winmm/*.c)
     set(SOURCE_FILES ${SOURCE_FILES} ${WINMM_AUDIO_SOURCES})
+    endif()
     set(HAVE_SDL_AUDIO TRUE)
 
-    if(HAVE_DSOUND_H)
+    if(HAVE_DSOUND_H AND NOT WINDOWS_STORE)
       set(SDL_AUDIO_DRIVER_DSOUND 1)
       file(GLOB DSOUND_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/directsound/*.c)
       set(SOURCE_FILES ${SOURCE_FILES} ${DSOUND_AUDIO_SOURCES})
     endif()
 
-    if(WASAPI AND HAVE_AUDIOCLIENT_H AND HAVE_MMDEVICEAPI_H)
+    if(WASAPI AND HAVE_AUDIOCLIENT_H AND HAVE_MMDEVICEAPI_H AND NOT WINDOWS_STORE)
       set(SDL_AUDIO_DRIVER_WASAPI 1)
       file(GLOB WASAPI_AUDIO_SOURCES ${SDL2_SOURCE_DIR}/src/audio/wasapi/*.c)
       set(SOURCE_FILES ${SOURCE_FILES} ${WASAPI_AUDIO_SOURCES})
@@ -1457,11 +1479,20 @@ elseif(WINDOWS)
     if(NOT SDL_LOADSO)
       message_error("SDL_VIDEO requires SDL_LOADSO, which is not enabled")
     endif()
+    if(WINDOWS_STORE)
+      set(SDL_VIDEO_DRIVER_WINRT 1)
+      file(GLOB WIN_VIDEO_SOURCES
+        ${SDL2_SOURCE_DIR}/src/video/winrt/*.c 
+        ${SDL2_SOURCE_DIR}/src/video/winrt/*.cpp
+        ${SDL2_SOURCE_DIR}/src/render/direct3d11/*.cpp
+        )
+    else()
     set(SDL_VIDEO_DRIVER_WINDOWS 1)
     file(GLOB WIN_VIDEO_SOURCES ${SDL2_SOURCE_DIR}/src/video/windows/*.c)
+    endif()
     set(SOURCE_FILES ${SOURCE_FILES} ${WIN_VIDEO_SOURCES})
 
-    if(RENDER_D3D AND HAVE_D3D_H)
+    if(RENDER_D3D AND HAVE_D3D_H AND NOT WINDOWS_STORE)
       set(SDL_VIDEO_RENDER_D3D 1)
       set(HAVE_RENDER_D3D TRUE)
     endif()
@@ -1491,10 +1522,15 @@ elseif(WINDOWS)
   endif()
 
   if(SDL_POWER)
+    if(WINDOWS_STORE)
+      set(SDL_POWER_WINRT 1)
+      set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/power/winrt/SDL_syspower.cpp)
+    else()
       set(SDL_POWER_WINDOWS 1)
       set(SOURCE_FILES ${SOURCE_FILES} ${SDL2_SOURCE_DIR}/src/power/windows/SDL_syspower.c)
       set(HAVE_SDL_POWER TRUE)
     endif()
+  endif()
 
   if(SDL_LOCALE)
     file(GLOB LOCALE_SOURCES ${SDL2_SOURCE_DIR}/src/locale/windows/*.c)
@@ -1504,13 +1540,19 @@ elseif(WINDOWS)
 
   if(SDL_FILESYSTEM)
     set(SDL_FILESYSTEM_WINDOWS 1)
+    if(WINDOWS_STORE)
+      file(GLOB FILESYSTEM_SOURCES ${SDL2_SOURCE_DIR}/src/filesystem/winrt/*.cpp)
+    else()
       file(GLOB FILESYSTEM_SOURCES ${SDL2_SOURCE_DIR}/src/filesystem/windows/*.c)
+    endif()
     set(SOURCE_FILES ${SOURCE_FILES} ${FILESYSTEM_SOURCES})
     set(HAVE_SDL_FILESYSTEM TRUE)
   endif()
 
   # Libraries for Win32 native and MinGW
+  if(NOT WINDOWS_STORE)
     list(APPEND EXTRA_LIBS user32 gdi32 winmm imm32 ole32 oleaut32 version uuid advapi32 setupapi shell32)
+  endif()
 
   # TODO: in configure.ac the check for timers is set on
   # cygwin | mingw32* - does this include mingw32CE?
@@ -1532,7 +1574,7 @@ elseif(WINDOWS)
   set(SOURCE_FILES ${SOURCE_FILES} ${CORE_SOURCES})
 
   if(SDL_VIDEO)
-    if(VIDEO_OPENGL)
+    if(VIDEO_OPENGL AND NOT WINDOWS_STORE)
       set(SDL_VIDEO_OPENGL 1)
       set(SDL_VIDEO_OPENGL_WGL 1)
       set(SDL_VIDEO_RENDER_OGL 1)
@@ -2145,12 +2187,14 @@ endif()
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_CFLAGS}")
 
 # Always build SDLmain
+if(NOT WINDOWS_STORE)
 add_library(SDL2main STATIC ${SDLMAIN_SOURCES})
 target_include_directories(SDL2main PUBLIC "$<BUILD_INTERFACE:${SDL2_SOURCE_DIR}/include>" $<INSTALL_INTERFACE:include> $<INSTALL_INTERFACE:include/SDL2>)
 set(_INSTALL_LIBS "SDL2main")
 if (NOT ANDROID)
   set_target_properties(SDL2main PROPERTIES DEBUG_POSTFIX "${SDL_CMAKE_DEBUG_POSTFIX}")
 endif()
+endif()
 
 if (ANDROID AND HAVE_HIDAPI)
   set(_INSTALL_LIBS ${_INSTALL_LIBS} "hidapi")

include/SDL_config.h.cmake

@@ -343,6 +343,7 @@
 #cmakedefine SDL_VIDEO_DRIVER_DUMMY @SDL_VIDEO_DRIVER_DUMMY@
 #cmakedefine SDL_VIDEO_DRIVER_OFFSCREEN @SDL_VIDEO_DRIVER_OFFSCREEN@
 #cmakedefine SDL_VIDEO_DRIVER_WINDOWS @SDL_VIDEO_DRIVER_WINDOWS@
+#cmakedefine SDL_VIDEO_DRIVER_WINRT @SDL_VIDEO_DRIVER_WINRT@
 #cmakedefine SDL_VIDEO_DRIVER_WAYLAND @SDL_VIDEO_DRIVER_WAYLAND@
 #cmakedefine SDL_VIDEO_DRIVER_RPI @SDL_VIDEO_DRIVER_RPI@
 #cmakedefine SDL_VIDEO_DRIVER_VIVANTE @SDL_VIDEO_DRIVER_VIVANTE@
@@ -411,6 +412,7 @@
 #cmakedefine SDL_POWER_ANDROID @SDL_POWER_ANDROID@
 #cmakedefine SDL_POWER_LINUX @SDL_POWER_LINUX@
 #cmakedefine SDL_POWER_WINDOWS @SDL_POWER_WINDOWS@
+#cmakedefine SDL_POWER_WINRT @SDL_POWER_WINRT@
 #cmakedefine SDL_POWER_MACOSX @SDL_POWER_MACOSX@
 #cmakedefine SDL_POWER_UIKIT @SDL_POWER_UIKIT@
 #cmakedefine SDL_POWER_HAIKU @SDL_POWER_HAIKU@
@@ -439,7 +441,7 @@
 #cmakedefine SDL_IPHONE_KEYBOARD @SDL_IPHONE_KEYBOARD@
 #cmakedefine SDL_IPHONE_LAUNCHSCREEN @SDL_IPHONE_LAUNCHSCREEN@
 
-#if !defined(__WIN32__)
+#if !defined(__WIN32__) && !defined(__WINRT__)
 #  if !defined(_STDINT_H_) && !defined(_STDINT_H) && !defined(HAVE_STDINT_H) && !defined(_HAVE_STDINT_H)
 typedef unsigned int size_t;
 typedef signed char int8_t;