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.

17 files changed, 281 insertions, 175 deletions

diff --git a/Alc/alc.cpp b/Alc/alc.cpp
index a7b53c6b..0bc099b4 100644
--- a/Alc/alc.cpp
+++ b/Alc/alc.cpp
@@ -22,47 +22,71 @@
 
 #include "version.h"
 
-#include <stdlib.h>
-#include <stdio.h>
-#include <memory.h>
-#include <ctype.h>
-#include <signal.h>
-
-#include <cmath>
+#include <exception>
+#include <algorithm>
+#include <array>
 #include <atomic>
+#include <cctype>
+#include <chrono>
+#include <climits>
+#include <cmath>
+#include <csignal>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <functional>
+#include <iterator>
+#include <limits>
+#include <memory>
 #include <mutex>
-#include <thread>
-#include <vector>
-#include <string>
+#include <new>
 #include <numeric>
-#include <algorithm>
-#include <functional>
+#include <string>
+#include <thread>
+#include <utility>
+
+#include "AL/al.h"
+#include "AL/alc.h"
+#include "AL/alext.h"
+#include "AL/efx.h"
 
-#include "alMain.h"
-#include "alcontext.h"
-#include "alSource.h"
-#include "alListener.h"
-#include "alSource.h"
-#include "alBuffer.h"
-#include "alFilter.h"
-#include "alEffect.h"
 #include "alAuxEffectSlot.h"
+#include "alEffect.h"
 #include "alError.h"
-#include "mastering.h"
-#include "bformatdec.h"
-#include "uhjfilter.h"
-#include "alu.h"
+#include "alFilter.h"
+#include "alListener.h"
+#include "alMain.h"
+#include "alSource.h"
+#include "albyte.h"
 #include "alconfig.h"
-#include "ringbuffer.h"
-#include "filters/splitter.h"
+#include "alcontext.h"
+#include "alexcpt.h"
+#include "almalloc.h"
+#include "alnumeric.h"
+#include "aloptional.h"
+#include "alspan.h"
+#include "alu.h"
+#include "ambidefs.h"
+#include "atomic.h"
+#include "bformatdec.h"
 #include "bs2b.h"
-
-#include "fpu_modes.h"
-#include "cpu_caps.h"
 #include "compat.h"
+#include "cpu_caps.h"
+#include "effects/base.h"
+#include "filters/nfc.h"
+#include "filters/splitter.h"
+#include "fpu_modes.h"
+#include "hrtf.h"
+#include "inprogext.h"
+#include "logging.h"
+#include "mastering.h"
+#include "opthelpers.h"
+#include "ringbuffer.h"
 #include "threads.h"
-#include "alexcpt.h"
-#include "almalloc.h"
+#include "uhjfilter.h"
+#include "vecmat.h"
+#include "vector.h"
 
 #include "backends/base.h"
 #include "backends/null.h"
diff --git a/Alc/alu.cpp b/Alc/alu.cpp
index f5c3b842..666cbb27 100644
--- a/Alc/alu.cpp
+++ b/Alc/alu.cpp
@@ -20,36 +20,62 @@
 
 #include "config.h"
 
-#include <math.h>
-#include <stdlib.h>
-#include <string.h>
-#include <ctype.h>
-#include <assert.h>
+#include "alu.h"
 
+#include <algorithm>
+#include <array>
+#include <atomic>
+#include <cassert>
+#include <chrono>
+#include <climits>
 #include <cmath>
+#include <cstdarg>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <functional>
+#include <iterator>
 #include <limits>
+#include <memory>
+#include <new>
 #include <numeric>
-#include <algorithm>
-#include <functional>
+#include <utility>
 
-#include "alMain.h"
-#include "alcontext.h"
-#include "alSource.h"
+#include "AL/al.h"
+#include "AL/alc.h"
+#include "AL/efx.h"
+
+#include "alAuxEffectSlot.h"
 #include "alBuffer.h"
+#include "alEffect.h"
 #include "alListener.h"
-#include "alAuxEffectSlot.h"
-#include "alu.h"
+#include "alMain.h"
+#include "alcontext.h"
+#include "almalloc.h"
+#include "alnumeric.h"
+#include "alspan.h"
+#include "ambidefs.h"
+#include "atomic.h"
+#include "bformatdec.h"
 #include "bs2b.h"
+#include "cpu_caps.h"
+#include "effects/base.h"
+#include "filters/biquad.h"
+#include "filters/nfc.h"
+#include "filters/splitter.h"
+#include "fpu_modes.h"
 #include "hrtf.h"
+#include "inprogext.h"
 #include "mastering.h"
-#include "uhjfilter.h"
-#include "bformatdec.h"
+#include "math_defs.h"
+#include "mixer/defs.h"
+#include "opthelpers.h"
 #include "ringbuffer.h"
-#include "filters/splitter.h"
+#include "threads.h"
+#include "uhjfilter.h"
+#include "vecmat.h"
+#include "vector.h"
 
-#include "mixer/defs.h"
-#include "fpu_modes.h"
-#include "cpu_caps.h"
 #include "bsinc_inc.h"
 
 
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 {
diff --git a/Alc/bformatdec.cpp b/Alc/bformatdec.cpp
index 6ef398ec..889bbf3a 100644
--- a/Alc/bformatdec.cpp
+++ b/Alc/bformatdec.cpp
@@ -1,27 +1,24 @@
 
 #include "config.h"
 
-#include <cmath>
+#include "bformatdec.h"
+
+#include <algorithm>
 #include <array>
-#include <vector>
+#include <cassert>
+#include <cmath>
+#include <iterator>
 #include <numeric>
-#include <algorithm>
-#include <functional>
 
-#include "bformatdec.h"
+#include "almalloc.h"
+#include "alu.h"
 #include "ambdec.h"
 #include "filters/splitter.h"
-#include "alu.h"
-
-#include "threads.h"
-#include "almalloc.h"
+#include "opthelpers.h"
 
 
 namespace {
 
-using namespace std::placeholders;
-
-
 constexpr ALfloat Ambi3DDecoderHFScale[MAX_AMBI_ORDER+1] = {
     1.00000000e+00f, 1.00000000e+00f
 };
diff --git a/Alc/bformatdec.h b/Alc/bformatdec.h
index 1ec4a1bb..31abc4fe 100644
--- a/Alc/bformatdec.h
+++ b/Alc/bformatdec.h
@@ -1,11 +1,17 @@
 #ifndef BFORMATDEC_H
 #define BFORMATDEC_H
 
+#include <array>
+#include <cstddef>
+
+#include "AL/al.h"
+
 #include "alMain.h"
-#include "filters/splitter.h"
-#include "ambidefs.h"
 #include "almalloc.h"
-
+#include "alspan.h"
+#include "ambidefs.h"
+#include "filters/splitter.h"
+#include "vector.h"
 
 struct AmbDecConf;
 
@@ -27,10 +33,10 @@ class BFormatDec {
     /* NOTE: BandSplitter filters are unused with single-band decoding */
     BandSplitter mXOver[MAX_AMBI_CHANNELS];
 
-    al::vector<std::array<ALfloat,BUFFERSIZE>, 16> mSamples;
+    al::vector<FloatBufferLine, 16> mSamples;
     /* These two alias into Samples */
-    std::array<ALfloat,BUFFERSIZE> *mSamplesHF{nullptr};
-    std::array<ALfloat,BUFFERSIZE> *mSamplesLF{nullptr};
+    FloatBufferLine *mSamplesHF{nullptr};
+    FloatBufferLine *mSamplesLF{nullptr};
 
     ALuint mNumChannels{0u};
     bool mDualBand{false};
diff --git a/Alc/effects/chorus.cpp b/Alc/effects/chorus.cpp
index a2a34008..b9bf3f4c 100644
--- a/Alc/effects/chorus.cpp
+++ b/Alc/effects/chorus.cpp
@@ -20,17 +20,28 @@
 
 #include "config.h"
 
+#include <algorithm>
+#include <climits>
+#include <cmath>
 #include <cstdlib>
+#include <iterator>
 
-#include <cmath>
-#include <algorithm>
+#include "AL/al.h"
+#include "AL/alc.h"
+#include "AL/efx.h"
 
-#include "alMain.h"
-#include "alcontext.h"
 #include "alAuxEffectSlot.h"
 #include "alError.h"
+#include "alMain.h"
+#include "alcontext.h"
+#include "almalloc.h"
+#include "alnumeric.h"
+#include "alspan.h"
 #include "alu.h"
-#include "filters/biquad.h"
+#include "ambidefs.h"
+#include "effects/base.h"
+#include "math_defs.h"
+#include "opthelpers.h"
 #include "vector.h"
 
 
diff --git a/Alc/filters/biquad.cpp b/Alc/filters/biquad.cpp
index e4b7bec0..6a3cef64 100644
--- a/Alc/filters/biquad.cpp
+++ b/Alc/filters/biquad.cpp
@@ -1,13 +1,13 @@
 
 #include "config.h"
 
-#include <cmath>
+#include "biquad.h"
 
-#include "AL/alc.h"
-#include "AL/al.h"
+#include <algorithm>
+#include <cassert>
+#include <cmath>
 
-#include "alMain.h"
-#include "biquad.h"
+#include "opthelpers.h"
 
 
 template<typename Real>
diff --git a/Alc/filters/biquad.h b/Alc/filters/biquad.h
index eb4cf82a..893a69a9 100644
--- a/Alc/filters/biquad.h
+++ b/Alc/filters/biquad.h
@@ -4,7 +4,6 @@
 #include <cmath>
 #include <utility>
 
-#include "AL/al.h"
 #include "math_defs.h"
 
 
diff --git a/Alc/helpers.cpp b/Alc/helpers.cpp
index ee0bb2dc..9f6283a3 100644
--- a/Alc/helpers.cpp
+++ b/Alc/helpers.cpp
@@ -28,14 +28,15 @@
 
 #include "config.h"
 
-#include <cstdlib>
-#include <ctime>
+#include <algorithm>
 #include <cerrno>
 #include <cstdarg>
-#include <cctype>
-#ifdef HAVE_MALLOC_H
-#include <malloc.h>
-#endif
+#include <cstdlib>
+#include <cstdio>
+#include <cstring>
+#include <mutex>
+#include <string>
+
 #ifdef HAVE_DIRENT_H
 #include <dirent.h>
 #endif
@@ -95,35 +96,19 @@ DEFINE_PROPERTYKEY(PKEY_AudioEndpoint_GUID, 0x1da5d803, 0xd492, 0x4edd, 0x8c, 0x
 #ifdef HAVE_SYS_SYSCONF_H
 #include <sys/sysconf.h>
 #endif
-#ifdef HAVE_FLOAT_H
-#include <cfloat>
-#endif
-#ifdef HAVE_IEEEFP_H
-#include <ieeefp.h>
-#endif
 
 #ifndef _WIN32
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-#include <fcntl.h>
 #include <unistd.h>
 #elif defined(_WIN32_IE)
 #include <shlobj.h>
 #endif
 
-#include <mutex>
-#include <vector>
-#include <string>
-#include <algorithm>
-
 #include "alMain.h"
-#include "alu.h"
+#include "almalloc.h"
+#include "compat.h"
 #include "cpu_caps.h"
 #include "fpu_modes.h"
-#include "vector.h"
-#include "compat.h"
-#include "threads.h"
+#include "logging.h"
 
 
 #if defined(HAVE_GCC_GET_CPUID) && (defined(__i386__) || defined(__x86_64__) || \
diff --git a/Alc/hrtf.cpp b/Alc/hrtf.cpp
index d86c4ecf..5561ebfd 100644
--- a/Alc/hrtf.cpp
+++ b/Alc/hrtf.cpp
@@ -20,30 +20,37 @@
 
 #include "config.h"
 
-#include <stdlib.h>
-#include <ctype.h>
+#include "hrtf.h"
 
-#include <mutex>
+#include <algorithm>
 #include <array>
-#include <vector>
+#include <cassert>
+#include <cctype>
+#include <cstdint>
+#include <cstdio>
+#include <cstring>
+#include <functional>
+#include <fstream>
+#include <iterator>
 #include <memory>
-#include <istream>
+#include <mutex>
+#include <new>
 #include <numeric>
-#include <algorithm>
-#include <functional>
+#include <utility>
 
 #include "AL/al.h"
-#include "AL/alc.h"
+
 #include "alMain.h"
-#include "alSource.h"
-#include "alu.h"
-#include "hrtf.h"
 #include "alconfig.h"
-#include "filters/splitter.h"
-
-#include "compat.h"
 #include "almalloc.h"
+#include "alnumeric.h"
+#include "aloptional.h"
 #include "alspan.h"
+#include "compat.h"
+#include "filters/splitter.h"
+#include "logging.h"
+#include "math_defs.h"
+#include "opthelpers.h"
 
 
 struct HrtfHandle {
diff --git a/Alc/hrtf.h b/Alc/hrtf.h
index 72533cc1..6c41cb82 100644
--- a/Alc/hrtf.h
+++ b/Alc/hrtf.h
@@ -2,15 +2,19 @@
 #define ALC_HRTF_H
 
 #include <array>
+#include <cstddef>
 #include <memory>
 #include <string>
 
 #include "AL/al.h"
-#include "AL/alc.h"
 
-#include "vector.h"
 #include "almalloc.h"
+#include "ambidefs.h"
+#include "atomic.h"
+#include "vector.h"
+
 
+struct HrtfHandle;
 
 #define HRTF_HISTORY_BITS   (6)
 #define HRTF_HISTORY_LENGTH (1<<HRTF_HISTORY_BITS)
@@ -21,8 +25,6 @@
 #define HRIR_MASK        (HRIR_LENGTH-1)
 
 
-struct HrtfHandle;
-
 struct HrtfEntry {
     RefCount ref;
 
diff --git a/Alc/mixvoice.cpp b/Alc/mixvoice.cpp
index 9b0196d9..1020cc74 100644
--- a/Alc/mixvoice.cpp
+++ b/Alc/mixvoice.cpp
@@ -20,32 +20,47 @@
 
 #include "config.h"
 
-#include <cmath>
+#include <algorithm>
+#include <array>
+#include <atomic>
+#include <cassert>
+#include <climits>
+#include <cstddef>
+#include <cstdint>
 #include <cstdlib>
 #include <cstring>
-#include <cctype>
-#include <cassert>
-
+#include <iterator>
+#include <memory>
+#include <new>
 #include <numeric>
-#include <algorithm>
+#include <string>
+#include <utility>
 
 #include "AL/al.h"
 #include "AL/alc.h"
 
+#include "alBuffer.h"
 #include "alMain.h"
-#include "alcontext.h"
 #include "alSource.h"
-#include "alBuffer.h"
-#include "alListener.h"
-#include "alAuxEffectSlot.h"
-#include "sample_cvt.h"
-#include "alu.h"
+#include "albyte.h"
 #include "alconfig.h"
-#include "ringbuffer.h"
+#include "alcontext.h"
+#include "alnumeric.h"
+#include "aloptional.h"
+#include "alspan.h"
+#include "alu.h"
 #include "cpu_caps.h"
+#include "filters/biquad.h"
+#include "filters/nfc.h"
+#include "filters/splitter.h"
+#include "hrtf.h"
+#include "inprogext.h"
+#include "logging.h"
 #include "mixer/defs.h"
-
-#include "alspan.h"
+#include "opthelpers.h"
+#include "ringbuffer.h"
+#include "threads.h"
+#include "vector.h"
 
 
 static_assert((INT_MAX>>FRACTIONBITS)/MAX_PITCH > BUFFERSIZE,