Clean up includes a bit

Trying out the IWYU tool to only include what's necessary in a given file.
Seems to work decently (it'll miss some headers, suggest unnecessary ones, and
make nonsense suggestions for some things, but overall gives a good starting
point), and helps clean out some headers.

6 files changed, 74 insertions, 40 deletions

diff --git a/Alc/backends/alsa.cpp b/Alc/backends/alsa.cpp
index aeb38585..698a4088 100644
--- a/Alc/backends/alsa.cpp
+++ b/Alc/backends/alsa.cpp
@@ -22,22 +22,33 @@
 
 #include "backends/alsa.h"
 
-#include <cstdlib>
-#include <cstdio>
-#include <memory.h>
-
-#include <atomic>
-#include <thread>
-#include <vector>
-#include <string>
 #include <algorithm>
+#include <atomic>
+#include <cassert>
+#include <cerrno>
+#include <chrono>
+#include <cstring>
+#include <exception>
 #include <functional>
+#include <memory>
+#include <string>
+#include <thread>
+#include <utility>
+
+#include "AL/al.h"
 
 #include "alMain.h"
-#include "alu.h"
+#include "albyte.h"
 #include "alconfig.h"
-#include "ringbuffer.h"
+#include "almalloc.h"
+#include "alnumeric.h"
+#include "aloptional.h"
+#include "alu.h"
 #include "compat.h"
+#include "logging.h"
+#include "ringbuffer.h"
+#include "threads.h"
+#include "vector.h"
 
 #include <alsa/asoundlib.h>
 
diff --git a/Alc/backends/dsound.cpp b/Alc/backends/dsound.cpp
index 93de3135..5c77df60 100644
--- a/Alc/backends/dsound.cpp
+++ b/Alc/backends/dsound.cpp
@@ -22,6 +22,9 @@
 
 #include "backends/dsound.h"
 
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <memory.h>
@@ -34,6 +37,7 @@
 #endif
 
 #include <atomic>
+#include <cassert>
 #include <thread>
 #include <string>
 #include <vector>
@@ -44,6 +48,7 @@
 #include "alu.h"
 #include "ringbuffer.h"
 #include "compat.h"
+#include "threads.h"
 
 /* MinGW-w64 needs this for some unknown reason now. */
 using LPCWAVEFORMATEX = const WAVEFORMATEX*;
diff --git a/Alc/backends/null.cpp b/Alc/backends/null.cpp
index 121d7700..00a37fda 100644
--- a/Alc/backends/null.cpp
+++ b/Alc/backends/null.cpp
@@ -22,18 +22,19 @@
 
 #include "backends/null.h"
 
-#include <cstdlib>
-#ifdef HAVE_WINDOWS_H
-#include <windows.h>
-#endif
-
+#include <exception>
+#include <atomic>
 #include <chrono>
-#include <thread>
+#include <cstdint>
+#include <cstring>
 #include <functional>
+#include <thread>
 
 #include "alMain.h"
+#include "almalloc.h"
 #include "alu.h"
-#include "compat.h"
+#include "logging.h"
+#include "threads.h"
 
 
 namespace {
diff --git a/Alc/backends/oss.cpp b/Alc/backends/oss.cpp
index e5b74334..33075890 100644
--- a/Alc/backends/oss.cpp
+++ b/Alc/backends/oss.cpp
@@ -22,32 +22,37 @@
 
 #include "backends/oss.h"
 
+#include <fcntl.h>
+#include <poll.h>
 #include <sys/ioctl.h>
-#include <sys/types.h>
-#include <sys/time.h>
 #include <sys/stat.h>
-#include <fcntl.h>
-#include <cstdlib>
-#include <cstdio>
-#include <cstring>
-#include <memory.h>
 #include <unistd.h>
-#include <cerrno>
-#include <poll.h>
-#include <cmath>
 
-#include <atomic>
-#include <thread>
-#include <vector>
-#include <string>
 #include <algorithm>
+#include <atomic>
+#include <cerrno>
+#include <cstdio>
+#include <cstring>
+#include <exception>
 #include <functional>
+#include <memory>
+#include <new>
+#include <string>
+#include <thread>
+#include <utility>
+
+#include "AL/al.h"
 
 #include "alMain.h"
-#include "alu.h"
 #include "alconfig.h"
+#include "almalloc.h"
+#include "alnumeric.h"
+#include "aloptional.h"
+#include "alu.h"
+#include "logging.h"
 #include "ringbuffer.h"
-#include "compat.h"
+#include "threads.h"
+#include "vector.h"
 
 #include <sys/soundcard.h>
 
diff --git a/Alc/backends/wasapi.cpp b/Alc/backends/wasapi.cpp
index db4b5e4e..384aaba8 100644
--- a/Alc/backends/wasapi.cpp
+++ b/Alc/backends/wasapi.cpp
@@ -22,6 +22,9 @@
 
 #include "backends/wasapi.h"
 
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <memory.h>
@@ -56,6 +59,7 @@
 #include "ringbuffer.h"
 #include "compat.h"
 #include "converter.h"
+#include "threads.h"
 
 
 /* Some headers seem to define these as macros for __uuidof, which is annoying
diff --git a/Alc/backends/wave.cpp b/Alc/backends/wave.cpp
index d06f36d7..77692686 100644
--- a/Alc/backends/wave.cpp
+++ b/Alc/backends/wave.cpp
@@ -22,20 +22,28 @@
 
 #include "backends/wave.h"
 
-#include <cstdlib>
-#include <cstdio>
-#include <memory.h>
+#include <algorithm>
+#include <atomic>
 #include <cerrno>
-
 #include <chrono>
-#include <thread>
-#include <vector>
+#include <cstdint>
+#include <cstdio>
+#include <cstring>
+#include <exception>
 #include <functional>
+#include <thread>
+
+#include "AL/al.h"
 
 #include "alMain.h"
-#include "alu.h"
 #include "alconfig.h"
+#include "almalloc.h"
+#include "alnumeric.h"
+#include "alu.h"
 #include "compat.h"
+#include "logging.h"
+#include "threads.h"
+#include "vector.h"
 
 
 namespace {