From b8fd7748249dd40fca976d18f7802f5e73f8deac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Trung=20L=C3=AA?= <8@tle.id.au>
Date: Wed, 27 Mar 2024 19:38:02 +1100
Subject: [PATCH] Add option to compile against shared OpenAL lib

---
 CMakeLists.txt        |  1 +
 extern/CMakeLists.txt | 36 ++++++++++++++++++++----------------
 src/CMakeLists.txt    |  8 ++++++--
 3 files changed, 27 insertions(+), 18 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5306f2825..a0998b27b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,6 +41,7 @@ ENDIF()
 OPTION(CONFIG_BUILD_GLSLANG "Build glslangValidator from source instead of using the SDK" ${DEFAULT_BUILD_GLSLANG})
 OPTION(CONFIG_BUILD_IPO "Enable interprocedural optimizations" OFF)
 OPTION(CONFIG_BUILD_SHADER_DEBUG_INFO "Build shaders with debug info" OFF)
+OPTION(USE_SYSTEM_OPENAL "Prefer system OpenAL Soft instead of the bundled one" OFF)
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 
 include(CheckIPOSupported)
diff --git a/extern/CMakeLists.txt b/extern/CMakeLists.txt
index 9f188b3d3..c99f7db02 100644
--- a/extern/CMakeLists.txt
+++ b/extern/CMakeLists.txt
@@ -96,19 +96,23 @@ target_include_directories(tinyobjloader INTERFACE ${CMAKE_CURRENT_SOURCE_DIR}/t
 #
 
 if (IS_64_BIT)
-    set(LIBTYPE STATIC)
-    option(FORCE_STATIC_VCRT "" ON)
-    option(ALSOFT_UTILS "" OFF)
-    option(ALSOFT_EXAMPLES "" OFF)
-    option(ALSOFT_UPDATE_BUILD_VERSION "" OFF)
-    option(ALSOFT_INSTALL "" OFF)
-    option(ALSOFT_INSTALL_CONFIG "" OFF)
-    option(ALSOFT_INSTALL_HRTF_DATA "" OFF)
-    option(ALSOFT_INSTALL_AMBDEC_PRESETS "" OFF)
-    option(ALSOFT_INSTALL_EXAMPLES "" OFF)
-    option(ALSOFT_INSTALL_UTILS "" OFF)
-    add_subdirectory(openal-soft)
-    set_target_properties(OpenAL PROPERTIES FOLDER extern/openal-soft)
-    set_target_properties(common PROPERTIES FOLDER extern/openal-soft)
-    set_target_properties(ex-common PROPERTIES FOLDER extern/openal-soft)
-endif()
\ No newline at end of file
+    if (USE_SYSTEM_OPENAL)
+        find_package(OpenAL REQUIRED)
+    else()
+        set(LIBTYPE STATIC)
+        option(FORCE_STATIC_VCRT "" ON)
+        option(ALSOFT_UTILS "" OFF)
+        option(ALSOFT_EXAMPLES "" OFF)
+        option(ALSOFT_UPDATE_BUILD_VERSION "" OFF)
+        option(ALSOFT_INSTALL "" OFF)
+        option(ALSOFT_INSTALL_CONFIG "" OFF)
+        option(ALSOFT_INSTALL_HRTF_DATA "" OFF)
+        option(ALSOFT_INSTALL_AMBDEC_PRESETS "" OFF)
+        option(ALSOFT_INSTALL_EXAMPLES "" OFF)
+        option(ALSOFT_INSTALL_UTILS "" OFF)
+        add_subdirectory(openal-soft)
+	set_target_properties(OpenAL PROPERTIES FOLDER extern/openal-soft)
+        set_target_properties(common PROPERTIES FOLDER extern/openal-soft)
+        set_target_properties(ex-common PROPERTIES FOLDER extern/openal-soft)
+    endif()
+endif()
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index f6908ca5b..26f336cc8 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -379,7 +379,11 @@ ADD_DEFINITIONS(-DVERSION_POINT=${Q2RTX_VERSION_POINT})
 ADD_DEFINITIONS(-DVERSION_SHA=${Q2RTX_VERSION_SHA})
 ADD_DEFINITIONS(-DVERSION_BRANCH=${Q2RTX_VERSION_BRANCH})
 
-ADD_DEFINITIONS(-DHAVE_CONFIG_H=1 -DCURL_STATICLIB -DAL_LIBTYPE_STATIC)
+ADD_DEFINITIONS(-DHAVE_CONFIG_H=1 -DCURL_STATICLIB)
+
+IF (NOT USE_SYSTEM_OPENAL)
+    ADD_DEFINITIONS(-DAL_LIBTYPE_STATIC)
+ENDIF()
 
 IF(WIN32)
 	ADD_DEFINITIONS(-D_CRT_SECURE_NO_WARNINGS)
@@ -505,7 +509,7 @@ IF (TARGET client)
 
     TARGET_LINK_LIBRARIES(client stb)
     TARGET_LINK_LIBRARIES(client tinyobjloader)
-	TARGET_LINK_LIBRARIES(client OpenAL)
+    TARGET_LINK_LIBRARIES(client OpenAL)
 ENDIF()
 
 SOURCE_GROUP("game\\sources" FILES ${SRC_GAME})