Only support dsound and mmdevapi on Windows

1 files changed, 35 insertions, 36 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 93732fc2..1b1fc772 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -810,45 +810,12 @@ IF(ALSOFT_REQUIRE_QSA AND NOT HAVE_QSA)
     MESSAGE(FATAL_ERROR "Failed to enabled required QSA backend")
 ENDIF()
 
-# Check DSound backend
+# Check Windows-only backends
+OPTION(ALSOFT_REQUIRE_WINMM "Require Windows Multimedia backend" OFF)
 OPTION(ALSOFT_REQUIRE_DSOUND "Require DirectSound backend" OFF)
-FIND_PACKAGE(DSound)
-IF(DSOUND_FOUND)
-    OPTION(ALSOFT_BACKEND_DSOUND "Enable DirectSound backend" ON)
-    IF(ALSOFT_BACKEND_DSOUND)
-        SET(HAVE_DSOUND 1)
-        SET(BACKENDS  "${BACKENDS} DirectSound${IS_LINKED},")
-        SET(ALC_OBJS  ${ALC_OBJS} Alc/backends/dsound.c)
-        ADD_BACKEND_LIBS(${DSOUND_LIBRARIES})
-        IF(CMAKE_VERSION VERSION_LESS "2.8.8")
-            INCLUDE_DIRECTORIES(${DSOUND_INCLUDE_DIRS})
-        ENDIF()
-    ENDIF()
-ENDIF()
-IF(ALSOFT_REQUIRE_DSOUND AND NOT HAVE_DSOUND)
-    MESSAGE(FATAL_ERROR "Failed to enabled required DSound backend")
-ENDIF()
-
-# Check for MMDevApi backend
 OPTION(ALSOFT_REQUIRE_MMDEVAPI "Require MMDevApi backend" OFF)
 IF(HAVE_WINDOWS_H)
-    CHECK_INCLUDE_FILE(mmdeviceapi.h HAVE_MMDEVICEAPI_H)
-    IF(HAVE_MMDEVICEAPI_H)
-        OPTION(ALSOFT_BACKEND_MMDEVAPI "Enable MMDevApi backend" ON)
-        IF(ALSOFT_BACKEND_MMDEVAPI)
-            SET(HAVE_MMDEVAPI 1)
-            SET(BACKENDS  "${BACKENDS} MMDevApi,")
-            SET(ALC_OBJS  ${ALC_OBJS} Alc/backends/mmdevapi.c)
-        ENDIF()
-    ENDIF()
-ENDIF()
-IF(ALSOFT_REQUIRE_MMDEVAPI AND NOT HAVE_MMDEVAPI)
-    MESSAGE(FATAL_ERROR "Failed to enabled required MMDevApi backend")
-ENDIF()
-
-# Check MMSystem backend
-OPTION(ALSOFT_REQUIRE_WINMM "Require Windows Multimedia backend" OFF)
-IF(HAVE_WINDOWS_H)
+    # Check MMSystem backend
     CHECK_INCLUDE_FILES("windows.h;mmsystem.h" HAVE_MMSYSTEM_H -D_WIN32_WINNT=0x0502)
     IF(HAVE_MMSYSTEM_H)
         CHECK_SHARED_FUNCTION_EXISTS(waveOutOpen "windows.h;mmsystem.h" winmm "" HAVE_LIBWINMM)
@@ -862,10 +829,42 @@ IF(HAVE_WINDOWS_H)
             ENDIF()
         ENDIF()
     ENDIF()
+
+    # Check DSound backend
+    FIND_PACKAGE(DSound)
+    IF(DSOUND_FOUND)
+        OPTION(ALSOFT_BACKEND_DSOUND "Enable DirectSound backend" ON)
+        IF(ALSOFT_BACKEND_DSOUND)
+            SET(HAVE_DSOUND 1)
+            SET(BACKENDS  "${BACKENDS} DirectSound${IS_LINKED},")
+            SET(ALC_OBJS  ${ALC_OBJS} Alc/backends/dsound.c)
+            ADD_BACKEND_LIBS(${DSOUND_LIBRARIES})
+            IF(CMAKE_VERSION VERSION_LESS "2.8.8")
+                INCLUDE_DIRECTORIES(${DSOUND_INCLUDE_DIRS})
+            ENDIF()
+        ENDIF()
+    ENDIF()
+
+    # Check for MMDevApi backend
+    CHECK_INCLUDE_FILE(mmdeviceapi.h HAVE_MMDEVICEAPI_H)
+    IF(HAVE_MMDEVICEAPI_H)
+        OPTION(ALSOFT_BACKEND_MMDEVAPI "Enable MMDevApi backend" ON)
+        IF(ALSOFT_BACKEND_MMDEVAPI)
+            SET(HAVE_MMDEVAPI 1)
+            SET(BACKENDS  "${BACKENDS} MMDevApi,")
+            SET(ALC_OBJS  ${ALC_OBJS} Alc/backends/mmdevapi.c)
+        ENDIF()
+    ENDIF()
 ENDIF()
 IF(ALSOFT_REQUIRE_WINMM AND NOT HAVE_WINMM)
     MESSAGE(FATAL_ERROR "Failed to enabled required WinMM backend")
 ENDIF()
+IF(ALSOFT_REQUIRE_DSOUND AND NOT HAVE_DSOUND)
+    MESSAGE(FATAL_ERROR "Failed to enabled required DSound backend")
+ENDIF()
+IF(ALSOFT_REQUIRE_MMDEVAPI AND NOT HAVE_MMDEVAPI)
+    MESSAGE(FATAL_ERROR "Failed to enabled required MMDevApi backend")
+ENDIF()
 
 # Check PortAudio backend
 OPTION(ALSOFT_REQUIRE_PORTAUDIO "Require PortAudio backend" OFF)