[Build] Make premake-androidmk generate something

.gitmodules

@@ -67,3 +67,6 @@
 [submodule "third_party/premake-cmake"]
 	path = third_party/premake-cmake
 	url = https://github.com/Enhex/premake-cmake.git
+[submodule "third_party/premake-androidmk"]
+	path = third_party/premake-androidmk
+	url = https://github.com/Meoo/premake-androidmk.git

premake5.lua

@@ -1,6 +1,9 @@
 include("tools/build")
 require("third_party/premake-export-compile-commands/export-compile-commands")
 require("third_party/premake-cmake/cmake")
+-- gmake required for androidmk.
+require("gmake")
+require("third_party/premake-androidmk/androidmk")
 
 location(build_root)
 targetdir(build_bin)
@@ -194,6 +197,10 @@ end
 solution("xenia")
   uuid("931ef4b0-6170-4f7a-aaf2-0fece7632747")
   startproject("xenia-app")
+  if os.istarget("android") then
+    architecture("ARM64")
+    platforms({"Android"})
+  else
     architecture("x86_64")
     if os.istarget("linux") then
       platforms({"Linux"})
@@ -207,6 +214,7 @@ solution("xenia")
         systemversion("10.0")
       filter({})
     end
+  end
   configurations({"Checked", "Debug", "Release"})
 
   include("third_party/aes_128.lua")
@@ -220,18 +228,15 @@ solution("xenia")
   include("third_party/imgui.lua")
   include("third_party/libav.lua")
   include("third_party/mspack.lua")
-  include("third_party/SDL2.lua")
   include("third_party/snappy.lua")
   include("third_party/spirv-tools.lua")
   include("third_party/volk.lua")
   include("third_party/xxhash.lua")
 
   include("src/xenia")
-  include("src/xenia/app")
   include("src/xenia/app/discord")
   include("src/xenia/apu")
   include("src/xenia/apu/nop")
-  include("src/xenia/apu/sdl")
   include("src/xenia/base")
   include("src/xenia/cpu")
   include("src/xenia/cpu/backend/x64")
@@ -239,16 +244,32 @@ solution("xenia")
   include("src/xenia/gpu")
   include("src/xenia/gpu/null")
   include("src/xenia/gpu/vulkan")
-  include("src/xenia/helper/sdl")
   include("src/xenia/hid")
   include("src/xenia/hid/nop")
-  include("src/xenia/hid/sdl")
   include("src/xenia/kernel")
   include("src/xenia/ui")
   include("src/xenia/ui/spirv")
   include("src/xenia/ui/vulkan")
   include("src/xenia/vfs")
 
+  if not os.istarget("android") then
+    -- SDL2 requires sdl2-config, and as of November 2020 isn't high-quality on
+    -- Android yet, most importantly in game controllers - the keycode and axis
+    -- enums are being ruined during conversion to SDL2 enums resulting in only
+    -- one controller (Nvidia Shield) being supported, digital triggers are also
+    -- not supported; lifecycle management (especially surface loss) is also
+    -- complicated.
+    include("third_party/SDL2.lua")
+
+    include("src/xenia/apu/sdl")
+    include("src/xenia/helper/sdl")
+    include("src/xenia/hid/sdl")
+
+    -- TODO(Triang3l): src/xenia/app has a dependency on xenia-helper-sdl, bring
+    -- it back later.
+    include("src/xenia/app")
+  end
+
   if os.istarget("windows") then
     include("src/xenia/apu/xaudio2")
     include("src/xenia/gpu/d3d12")

third_party/cpptoml.lua

@@ -1,7 +1,12 @@
 group("third_party")
 project("cpptoml")
   uuid("1e86cc51-3f8b-476d-9249-3b200424846b")
+  if os.istarget("android") then
+    -- ndk-build only supports StaticLib and SharedLib.
+    kind("StaticLib")
+  else
     kind("Utility")
+  end
   language("C++")
   files({
     "cpptoml/include/cpptoml.h",

third_party/cxxopts.lua

@@ -1,7 +1,12 @@
 group("third_party")
 project("cxxopts")
   uuid("8b68cbe8-2da4-4f28-be14-9352eafa3168")
+  if os.istarget("android") then
+    -- ndk-build only supports StaticLib and SharedLib.
+    kind("StaticLib")
+  else
     kind("Utility")
+  end
   language("C++")
   files({
     "cxxopts/include/cxxopts.hpp",

third_party/premake-androidmk

@@ -0,0 +1 @@
+Subproject commit a9f1733a70e71c1fc27a93e4153ac5e077d20c08