Build: Add SDL as link dependency for centurion

Default is shared linkage, also provide -static and -headers-only (bring
your own SDL) targets.

Also ditch the FindModules hanging out in the CMake folder. SDL ships
with appropriate config mode module discovery and CMake ships with
FindModules for SDL components.

CMakeLists.txt

@@ -38,15 +38,37 @@ set(CENTURION_TEST_TARGET centurion-tests)
 set(CENTURION_MOCK_TARGET centurion-mocks)
 
 # System dependencies
-find_package(SDL2 REQUIRED)
-find_package(SDL2_image REQUIRED)
-find_package(SDL2_mixer REQUIRED)
-find_package(SDL2_ttf REQUIRED)
+find_package(SDL2 CONFIG REQUIRED)
+find_package(SDL2_image CONFIG REQUIRED)
+find_package(SDL2_mixer CONFIG REQUIRED)
+find_package(SDL2_ttf CONFIG REQUIRED)
+
+# CMake Targets
+add_library(centurion-headers-only INTERFACE)
+add_library(centurion::centurion-headers-only ALIAS centurion-headers-only)
+add_subdirectory("${CEN_SOURCE_DIR}")
 
-# CMake Target
 add_library(centurion INTERFACE)
-add_subdirectory("${CEN_SOURCE_DIR}")
 add_library(centurion::centurion ALIAS centurion)
+target_link_libraries(centurion INTERFACE
+  centurion-headers-only
+  SDL2::SDL2
+  SDL2_image::SDL2_image
+  SDL2_mixer::SDL2_mixer
+  SDL2_ttf::SDL2_ttf
+)
+
+if (TARGET SDL2::SDL2-static)
+  add_library(centurion-static INTERFACE)
+  add_library(centurion::centurion-static ALIAS centurion-static)
+  target_link_libraries(centurion-static INTERFACE
+    centurion-headers-only
+    SDL2::SDL2-static
+    SDL2_image::SDL2_image-static
+    SDL2_mixer::SDL2_mixer-static
+    SDL2_ttf::SDL2_ttf-static
+  )
+endif ()
 
 if (BUILD_TESTS)
   # Vcpkg test dependencies
@@ -89,11 +111,15 @@ install(FILES
 )
 
 install(
-  TARGETS centurion
+  TARGETS centurion-headers-only centurion
   EXPORT centurionTargets
   FILE_SET HEADERS
 )
 
+if(TARGET centurion-static)
+  install(TARGETS centurion-static EXPORT centurionTargets)
+endif()
+
 install(
   EXPORT centurionTargets
   NAMESPACE centurion::

README.md

@@ -24,7 +24,7 @@ int main(int argc, char* argv[])
 
   cen::window window {"Centurion"};
   cen::renderer renderer = window.make_renderer();
-  
+
   window.show();
 
   bool running = true;
@@ -91,10 +91,13 @@ mandatory. The extension libraries can be disabled at compile-time, by defining
 
 ## Installation
 
-The library is distributed as a header-only library, which can be found in the `src` directory. Just download the
+**Header Only**: The library is distributed as a header-only library, which can be found in the `src` directory. Just download the
 headers include them in your project, and the library it's ready to be used. You will of course also need to install
 SDL2.
 
+**CMake Subproject**: The library can be included as a subproject in your project. After integrating the code you can use
+`add_subdirectory(path/to/centurion)` and then `target_link_libraries(program PRIVATE centurion::centurion)`
+
 ## Documentation
 
 For additional documentation, see the [wiki](https://github.com/albin-johansson/centurion/wiki), hosted on GitHub.