build: Support building libretro core for Android

CMakeLists.txt

@@ -50,7 +50,7 @@ if(BUILD_LIBRETRO_CORE)
   if(USE_X11)
     set(USE_X11 OFF)
   endif()
-  if(USE_EGL)
+  if(BUILD_LIBRETRO_CORE AND USE_EGL)
     set(USE_EGL OFF)
   endif()
 
@@ -187,6 +187,6 @@ enable_testing()
 add_subdirectory(dep)
 add_subdirectory(src)
 
-if(ANDROID)
+if(ANDROID AND NOT BUILD_LIBRETRO_CORE)
   add_subdirectory(android/app/src/cpp)
 endif()

src/common/CMakeLists.txt

@@ -141,7 +141,7 @@ if(USE_EGL)
       gl/context_egl_x11.h
     )
   endif()
-  if(ANDROID)
+  if(ANDROID AND USE_EGL)
     target_sources(common PRIVATE
       gl/context_egl_android.cpp
       gl/context_egl_android.h

src/common/gl/context.cpp

@@ -75,8 +75,10 @@ std::unique_ptr<GL::Context> Context::Create(const WindowInfo& wi, const Version
 #elif defined(__APPLE__)
   context = ContextAGL::Create(wi, versions_to_try, num_versions_to_try);
 #elif defined(ANDROID)
+#ifdef USE_EGL
   context = ContextEGLAndroid::Create(wi, versions_to_try, num_versions_to_try);
-#else
+#endif
+#elif defined(USE_X11)
   if (wi.type == WindowInfo::Type::X11)
   {
 #ifdef USE_EGL

src/duckstation-libretro/CMakeLists.txt

@@ -30,3 +30,7 @@ set_target_properties(duckstation_libretro PROPERTIES PREFIX "")
 set_target_properties(duckstation_libretro PROPERTIES RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}")
 set_target_properties(duckstation_libretro PROPERTIES LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}")
 
+# for android, suffix _android
+if(ANDROID)
+  set_target_properties(duckstation_libretro PROPERTIES OUTPUT_NAME "duckstation_libretro_android")
+endif()