From 80ac6c03b55949a53104cc5d1fdb58eabd2e5bcd Mon Sep 17 00:00:00 2001
From: Castor215 <132155746+Castor215@users.noreply.github.com>
Date: Fri, 10 Nov 2023 21:15:02 +0000
Subject: [PATCH] externals: allow user to use system openal (#7145)

---
 externals/CMakeLists.txt                      | 24 ++++++++-----
 .../cmake-modules/CitraHandleSystemLibs.cmake |  3 ++
 externals/cmake-modules/FindOpenAL.cmake      | 36 +++++++++++++++++++
 3 files changed, 54 insertions(+), 9 deletions(-)
 create mode 100644 externals/cmake-modules/FindOpenAL.cmake

diff --git a/externals/CMakeLists.txt b/externals/CMakeLists.txt
index a9b44e623f..48afa0e1ff 100644
--- a/externals/CMakeLists.txt
+++ b/externals/CMakeLists.txt
@@ -344,15 +344,21 @@ endif()
 
 # OpenAL Soft
 if (ENABLE_OPENAL)
-    set(ALSOFT_EMBED_HRTF_DATA OFF CACHE BOOL "")
-    set(ALSOFT_EXAMPLES OFF CACHE BOOL "")
-    set(ALSOFT_INSTALL OFF CACHE BOOL "")
-    set(ALSOFT_INSTALL_CONFIG OFF CACHE BOOL "")
-    set(ALSOFT_INSTALL_HRTF_DATA OFF CACHE BOOL "")
-    set(ALSOFT_INSTALL_AMBDEC_PRESETS OFF CACHE BOOL "")
-    set(ALSOFT_UTILS OFF CACHE BOOL "")
-    set(LIBTYPE "STATIC" CACHE STRING "")
-    add_subdirectory(openal-soft EXCLUDE_FROM_ALL)
+    if(USE_SYSTEM_OPENAL)
+        add_library(OpenAL INTERFACE)
+        find_package(OpenAL REQUIRED)
+        target_link_libraries(OpenAL INTERFACE OpenAL::OpenAL)
+    else()
+        set(ALSOFT_EMBED_HRTF_DATA OFF CACHE BOOL "")
+        set(ALSOFT_EXAMPLES OFF CACHE BOOL "")
+        set(ALSOFT_INSTALL OFF CACHE BOOL "")
+        set(ALSOFT_INSTALL_CONFIG OFF CACHE BOOL "")
+        set(ALSOFT_INSTALL_HRTF_DATA OFF CACHE BOOL "")
+        set(ALSOFT_INSTALL_AMBDEC_PRESETS OFF CACHE BOOL "")
+        set(ALSOFT_UTILS OFF CACHE BOOL "")
+        set(LIBTYPE "STATIC" CACHE STRING "")
+        add_subdirectory(openal-soft EXCLUDE_FROM_ALL)
+    endif()
 endif()
 
 # VMA
diff --git a/externals/cmake-modules/CitraHandleSystemLibs.cmake b/externals/cmake-modules/CitraHandleSystemLibs.cmake
index 28a1097f20..471301c73e 100644
--- a/externals/cmake-modules/CitraHandleSystemLibs.cmake
+++ b/externals/cmake-modules/CitraHandleSystemLibs.cmake
@@ -22,6 +22,7 @@ option(USE_SYSTEM_ENET "Use the system libenet (instead of the bundled one)" OFF
 option(USE_SYSTEM_CRYPTOPP "Use the system cryptopp (instead of the bundled one)" OFF)
 option(USE_SYSTEM_CUBEB "Use the system cubeb (instead of the bundled one)" OFF)
 option(USE_SYSTEM_LODEPNG "Use the system lodepng (instead of the bundled one)" OFF)
+option(USE_SYSTEM_OPENAL "Use the system OpenAL (instead of the bundled one)" OFF)
 
 # Qt and MoltenVK are handled separately
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_SDL2 "Disable system SDL2" OFF "USE_SYSTEM_LIBS" OFF)
@@ -43,6 +44,7 @@ CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_ENET "Disable system libenet" OFF "USE_SYS
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_CRYPTOPP "Disable system cryptopp" OFF "USE_SYSTEM_LIBS" OFF)
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_CUBEB "Disable system cubeb" OFF "USE_SYSTEM_LIBS" OFF)
 CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_LODEPNG "Disable system lodepng" OFF "USE_SYSTEM_LIBS" OFF)
+CMAKE_DEPENDENT_OPTION(DISABLE_SYSTEM_OPENAL "Disable system OpenAL" OFF "USE_SYSTEM_LIBS" OFF)
 
 set(LIB_VAR_LIST
     SDL2
@@ -64,6 +66,7 @@ set(LIB_VAR_LIST
     CRYPTOPP
     CUBEB
     LODEPNG
+    OPENAL
     )
 
 # First, check that USE_SYSTEM_XXX is not used with USE_SYSTEM_LIBS
diff --git a/externals/cmake-modules/FindOpenAL.cmake b/externals/cmake-modules/FindOpenAL.cmake
new file mode 100644
index 0000000000..1a778febb0
--- /dev/null
+++ b/externals/cmake-modules/FindOpenAL.cmake
@@ -0,0 +1,36 @@
+if(NOT OPENAL_FOUND)
+    pkg_check_modules(OOPENAL_TMP libopanal)
+
+    find_path(OPENAL_INCLUDE_DIRS NAMES al.h
+            PATHS
+            ${OPENAL_TMP_INCLUDE_DIRS}
+            /usr/include/AL
+            /usr/include
+            /usr/local/include/AL
+            /usr/local/include
+            )
+
+    find_library(OPENAL_LIBRARY_DIRS NAMES openal
+            PATHS
+            ${OPENAL_TMP_LIBRARY_DIRS}
+            /usr/lib
+            /usr/local/lib
+            )
+
+    if(OPENAL_INCLUDE_DIRS AND OPENAL_LIBRARY_DIRS)
+        set(OPENAL_FOUND TRUE CACHE INTERNAL "OpenAL found")
+        message(STATUS "Found OpenAL: ${OPENAL_LIBRARY_DIRS}, ${OPENAL_INCLUDE_DIRS}")
+    else()
+        set(OPENAL_FOUND FALSE CACHE INTERNAL "OpenAL found")
+        message(STATUS "OpenAL not found.")
+    endif()
+endif()
+
+if(OPENAL_FOUND AND NOT TARGET OpenAL::OpenAL)
+    add_library(OpenAL::OpenAL UNKNOWN IMPORTED)
+    set_target_properties(OpenAL::OpenAL PROPERTIES
+            INCLUDE_DIRECTORIES ${OPENAL_INCLUDE_DIRS}
+            INTERFACE_LINK_LIBRARIES ${OPENAL_LIBRARY_DIRS}
+            IMPORTED_LOCATION ${OPENAL_LIBRARY_DIRS}
+            )
+endif()