Add dynamic OS version check

CMakeLists.txt

@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 3.20)
 project(XboxAudio2 LANGUAGES CXX ASM_MASM)
+add_subdirectory(lib)
 
 file(GLOB_RECURSE XAUDIO_SOURCES CONFIGURE_DEPENDS "include/*.h" "source/*.cpp" "source/*.h" "source/*.asm")
 add_library(XAudio2_9 SHARED ${XAUDIO_SOURCES})
@@ -12,3 +13,6 @@ target_link_libraries(XAudio2_9 PRIVATE ${FFMPEG_LIBRARIES})
 
 find_package(wil CONFIG REQUIRED)
 target_link_libraries(XAudio2_9 PRIVATE WIL::WIL)
+
+target_link_directories(XAudio2_9 PRIVATE lib)
+target_link_libraries(XAudio2_9 PRIVATE kernelx)

lib/.gitignore

@@ -0,0 +1,2 @@
+*.exp
+*.lib

lib/CMakeLists.txt

@@ -0,0 +1,18 @@
+file(GLOB DEF_FILES CONFIGURE_DEPENDS "${CMAKE_CURRENT_SOURCE_DIR}/*.def")
+cmake_path(CONVERT "${DEF_FILES}" TO_NATIVE_PATH_LIST DEF_FILES)
+
+foreach(DEF_FILE ${DEF_FILES})
+    get_filename_component(DEF_NAME_WE "${DEF_FILE}" NAME_WE)
+
+    execute_process(
+        COMMAND lib
+            /machine:x64
+            "/def:${DEF_FILE}"
+            "/out:${CMAKE_CURRENT_SOURCE_DIR}\\${DEF_NAME_WE}.lib"
+        RESULT_VARIABLE LIB_RESULT
+        ERROR_VARIABLE LIB_ERROR)
+    
+    if(NOT LIB_RESULT EQUAL 0)
+        message(FATAL_ERROR "${LIB_ERROR}")
+    endif()
+endforeach()

lib/kernelx.def

@@ -0,0 +1,3 @@
+LIBRARY kernelx.dll
+EXPORTS
+    GetVersionExW

source/xaudio2.cpp

@@ -47,25 +47,38 @@ BOOL WINAPI DllMain(
     _In_ DWORD fdwReason,
     _In_ LPVOID lpvReserved)
 {
+    OSVERSIONINFOW OsVersion = { sizeof(OsVersion) };
+
     if (fdwReason != DLL_PROCESS_ATTACH)
         return TRUE;
 
-    // TODO: Dynamic check
+    // This should link to kernelx.dll!GetVersionExW.
-#if 1
+#pragma warning(suppress : 28159)
-    OrdinalProc1 = GetProcAddress(hinstDLL, "CreateAudioReverb");
+    if (!GetVersionExW(&OsVersion))
-    OrdinalProc2 = GetProcAddress(hinstDLL, "CreateAudioVolumeMeter");
+        return FALSE;
-    OrdinalProc3 = GetProcAddress(hinstDLL, "CreateFX");
+
-    OrdinalProc4 = GetProcAddress(hinstDLL, "CreateXAudio2Object");
+    // 6.2.10698.0 is the oldest known OS version with CreateXAudio2Object.
-    OrdinalProc5 = GetProcAddress(hinstDLL, "X3DAudioCalculate");
+    if (OsVersion.dwMajorVersion > 6 ||
-    OrdinalProc6 = GetProcAddress(hinstDLL, "X3DAudioInitialize");
+        (OsVersion.dwMajorVersion == 6 && OsVersion.dwMinorVersion > 2) ||
-#else
+        (OsVersion.dwMajorVersion == 6 && OsVersion.dwMinorVersion == 2 && OsVersion.dwBuildNumber >= 10698))
-    OrdinalProc1 = GetProcAddress(hinstDLL, "XAudio2Create");
+    {
-    OrdinalProc2 = GetProcAddress(hinstDLL, "CreateAudioReverb");
+        OrdinalProc1 = GetProcAddress(hinstDLL, "CreateAudioReverb");
-    OrdinalProc3 = GetProcAddress(hinstDLL, "CreateAudioVolumeMeter");
+        OrdinalProc2 = GetProcAddress(hinstDLL, "CreateAudioVolumeMeter");
-    OrdinalProc4 = GetProcAddress(hinstDLL, "CreateFX");
+        OrdinalProc3 = GetProcAddress(hinstDLL, "CreateFX");
-    OrdinalProc5 = GetProcAddress(hinstDLL, "X3DAudioCalculate");
+        OrdinalProc4 = GetProcAddress(hinstDLL, "CreateXAudio2Object");
-    OrdinalProc6 = GetProcAddress(hinstDLL, "X3DAudioInitialize");
+        OrdinalProc5 = GetProcAddress(hinstDLL, "X3DAudioCalculate");
-#endif
+        OrdinalProc6 = GetProcAddress(hinstDLL, "X3DAudioInitialize");
+    }
+    else
+    {
+        OrdinalProc1 = GetProcAddress(hinstDLL, "XAudio2Create");
+        OrdinalProc2 = GetProcAddress(hinstDLL, "CreateAudioReverb");
+        OrdinalProc3 = GetProcAddress(hinstDLL, "CreateAudioVolumeMeter");
+        OrdinalProc4 = GetProcAddress(hinstDLL, "CreateFX");
+        OrdinalProc5 = GetProcAddress(hinstDLL, "X3DAudioCalculate");
+        OrdinalProc6 = GetProcAddress(hinstDLL, "X3DAudioInitialize");
+    }
+
     return TRUE;
 }