diff --git a/src/app/app_core.c b/src/app/app_core.c
index 98892718..a8f78b5c 100644
--- a/src/app/app_core.c
+++ b/src/app/app_core.c
@@ -248,7 +248,7 @@ void P_AppStartup(String args_str)
     SimStartupReceipt sim_sr            = sim_startup();
 
     /* Interface systems */
-    PB_StartupReceipt playback_sr       = playback_startup(&mixer_sr);
+    PB_StartupReceipt playback_sr       = PB_Startup(&mixer_sr);
     struct user_startup_receipt user_sr = user_startup(&font_sr, &sprite_sr, &draw_sr, &asset_cache_sr, &sound_sr, &mixer_sr, &sim_sr, connect_address);
 
     (UNUSED)user_sr;
diff --git a/src/base/base_core.h b/src/base/base_core.h
index b0dea057..51a3211c 100644
--- a/src/base/base_core.h
+++ b/src/base/base_core.h
@@ -83,6 +83,15 @@ extern "C" {
 # define LanguageIsC 1
 #endif
 
+//- Windows NTDDI version
+/* FIXME: Remove this */
+#if 0
+#if PlatformIsWindows
+# define NTDDI_WIN11_DT 0x0C0A0000
+# define NTDDI_VERSION 0x0A000000
+#endif
+#endif
+
 ////////////////////////////////
 //~ Debug
 
diff --git a/src/base/base_fiber.c b/src/base/base_fiber.c
index 37299c06..bab456ff 100644
--- a/src/base/base_fiber.c
+++ b/src/base/base_fiber.c
@@ -1,9 +1,14 @@
 #if PlatformIsWindows
 
+////////////////////////////////
+//~ Windows headers
 #define WIN32_LEAN_AND_MEAN
 #define UNICODE
 #include <Windows.h>
 
+////////////////////////////////
+//~ FiberId
+
 i16 FiberId(void)
 {
     return (i16)(i64)GetFiberData();
diff --git a/src/base/base_incbin.c b/src/base/base_incbin.c
index 20212cc5..7ce9795a 100644
--- a/src/base/base_incbin.c
+++ b/src/base/base_incbin.c
@@ -1,9 +1,15 @@
 #if CompilerIsMsvc
 
+////////////////////////////////
+//~ Windows headers
+
 #define WIN32_LEAN_AND_MEAN
 #define UNICODE
 #include <Windows.h>
 
+////////////////////////////////
+//~ Incbin
+
 /* Find first resource with `type` and return the data in `udata`. */
 BOOL CALLBACK IncbinEnumerateResourceNamesFunc(HMODULE module, LPCWSTR type, LPCWSTR wstr_entry_name, LONG_PTR udata)
 {
diff --git a/src/base/base_memory.c b/src/base/base_memory.c
index 21fadb11..5f709fa9 100644
--- a/src/base/base_memory.c
+++ b/src/base/base_memory.c
@@ -1,13 +1,15 @@
+#if PlatformIsWindows
 
 ////////////////////////////////
-//~ Memory allocation
-
-#if PlatformIsWindows
+//~ Windows headers
 
 #define WIN32_LEAN_AND_MEAN
 #define UNICODE
 #include <Windows.h>
 
+////////////////////////////////
+//~ Memory allocation
+
 //- Reserve
 void *ReserveMemory(u64 size)
 {
diff --git a/src/dxc/dxc_core_win32.cpp b/src/dxc/dxc_core_win32.cpp
index 2dedccb5..a7336146 100644
--- a/src/dxc/dxc_core_win32.cpp
+++ b/src/dxc/dxc_core_win32.cpp
@@ -16,6 +16,9 @@ DXC_Result DXC_Compile(Arena *arena, String shader_source, i32 num_args, String
 # pragma clang diagnostic ignored "-Wlanguage-extension-token"
 #endif
 
+////////////////////////////////
+//~ Windows headers
+
 #pragma warning(push, 0)
 # define WIN32_LEAN_AND_MEAN
 # define UNICODE
@@ -28,6 +31,9 @@ DXC_Result DXC_Compile(Arena *arena, String shader_source, i32 num_args, String
 #pragma comment(lib, "d3dcompiler")
 #pragma comment(lib, "dxcompiler")
 
+////////////////////////////////
+//~ Compile
+
 /* https://github.com/microsoft/DirectXShaderCompiler/wiki/Using-dxc.exe-and-dxcompiler.dll */
 DXC_Result DXC_Compile(Arena *arena, String shader_source, i32 num_args, String *args)
 {
diff --git a/src/gp/gp_core_dx12.c b/src/gp/gp_core_dx12.c
index f379918a..922da0bd 100644
--- a/src/gp/gp_core_dx12.c
+++ b/src/gp/gp_core_dx12.c
@@ -1,3 +1,6 @@
+////////////////////////////////
+//~ Windows headers
+
 #pragma warning(push, 0)
 # define UNICODE
 # define COBJMACROS
@@ -20,6 +23,9 @@
 # pragma comment(lib, "advapi32")
 #endif
 
+////////////////////////////////
+//~ Dx12
+
 #define DX12_ALLOW_TEARING 1
 #define DX12_WAIT_FRAME_LATENCY 1
 #define DX12_SWAPCHAIN_FLAGS            (((DX12_ALLOW_TEARING != 0) * DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING) | ((DX12_WAIT_FRAME_LATENCY != 0) * DXGI_SWAP_CHAIN_FLAG_FRAME_LATENCY_WAITABLE_OBJECT))
diff --git a/src/mp3/mp3.h b/src/mp3/mp3.h
index b24ced56..6ae91e50 100644
--- a/src/mp3/mp3.h
+++ b/src/mp3/mp3.h
@@ -5,19 +5,4 @@
 
 #include "mp3_core.h"
 
-#if PlatformIsWindows
- #pragma warning(push, 0)
-#  define COBJMACROS
-#  define WIN32_LEAN_AND_MEAN
-#  define UNICODE
-#  include <Windows.h>
-#  include <uuids.h>
-#  include <mfapi.h>
-#  include <mfidl.h>
-#  include <mfreadwrite.h>
-#  include <Shlwapi.h>
-# pragma warning(pop)
-# include "mp3_mmf.h"
-#endif
-
 #endif
diff --git a/src/mp3/mp3_mmf.c b/src/mp3/mp3_mmf.c
index 438503bc..f35dfc91 100644
--- a/src/mp3/mp3_mmf.c
+++ b/src/mp3/mp3_mmf.c
@@ -1,7 +1,25 @@
+////////////////////////////////
+//~ Windows headers
+
+#pragma warning(push, 0)
+# define COBJMACROS
+# define WIN32_LEAN_AND_MEAN
+# define UNICODE
+# include <Windows.h>
+# include <uuids.h>
+# include <mfapi.h>
+# include <mfidl.h>
+# include <mfreadwrite.h>
+# include <Shlwapi.h>
+#pragma warning(pop)
+
 #pragma comment(lib, "mfplat")
 #pragma comment(lib, "mfreadwrite")
 #pragma comment(lib, "shlwapi")
 
+////////////////////////////////
+//~ Decode
+
 MP3_Result MP3_Decode(Arena *arena, String encoded, u32 sample_rate, MP3_DecodeFlag flags)
 {
     MP3_Result result = ZI;
diff --git a/src/mp3/mp3_mmf.h b/src/mp3/mp3_mmf.h
deleted file mode 100644
index e69de29b..00000000
diff --git a/src/platform/platform.h b/src/platform/platform.h
index fa98c422..053f2d51 100644
--- a/src/platform/platform.h
+++ b/src/platform/platform.h
@@ -8,24 +8,6 @@
 #include "platform_log.h"
 
 #if PlatformIsWindows
-# pragma warning(push, 0)
-#  define UNICODE
-#  define WIN32_LEAN_AND_MEAN
-/* FIXME: Remove this */
-#  define NTDDI_WIN11_DT 0x0C0A0000
-#  define NTDDI_VERSION 0x0A000000
-#  include <Windows.h>
-#  include <WinSock2.h>
-#  include <TlHelp32.h>
-#  include <WS2tcpip.h>
-#  include <windowsx.h>
-#  include <ShlObj_core.h>
-#  include <fileapi.h>
-#  include <dwmapi.h>
-#  include <bcrypt.h>
-#  include <avrt.h>
-#  include <shellapi.h>
-# pragma warning(pop)
 # include "platform_win32.h"
 #endif
 
diff --git a/src/platform/platform_win32.h b/src/platform/platform_win32.h
index 7bda8516..a1755548 100644
--- a/src/platform/platform_win32.h
+++ b/src/platform/platform_win32.h
@@ -1,3 +1,22 @@
+////////////////////////////////
+//~ Win32 headers
+
+#pragma warning(push, 0)
+#  define UNICODE
+#  define WIN32_LEAN_AND_MEAN
+#  include <Windows.h>
+#  include <WinSock2.h>
+#  include <TlHelp32.h>
+#  include <WS2tcpip.h>
+#  include <windowsx.h>
+#  include <ShlObj_core.h>
+#  include <fileapi.h>
+#  include <dwmapi.h>
+#  include <bcrypt.h>
+#  include <avrt.h>
+#  include <shellapi.h>
+#pragma warning(pop)
+
 ////////////////////////////////
 //~ Ticket mutex types
 
diff --git a/src/playback/playback.c b/src/playback/playback.c
index e254378f..4a7f6ea2 100644
--- a/src/playback/playback.c
+++ b/src/playback/playback.c
@@ -1,7 +1,7 @@
 #include "playback.h"
 
 #if PlatformIsWindows
-# include "playback_core_win32.c"
+# include "playback_win32.c"
 #else
 # error Playback core not implemented for this platform
 #endif
diff --git a/src/playback/playback.h b/src/playback/playback.h
index 9ed64c6f..92189091 100644
--- a/src/playback/playback.h
+++ b/src/playback/playback.h
@@ -7,4 +7,8 @@
 
 #include "playback_core.h"
 
+#if PlatformIsWindows
+# include "playback_win32.h"
+#endif
+
 #endif
diff --git a/src/playback/playback_core.h b/src/playback/playback_core.h
index 78e31f28..06a409d3 100644
--- a/src/playback/playback_core.h
+++ b/src/playback/playback_core.h
@@ -1,2 +1,4 @@
+#define PB_SampleRate 48000
+
 Struct(PB_StartupReceipt) { i32 _; };
-PB_StartupReceipt playback_startup(M_StartupReceipt *mixer_sr);
+PB_StartupReceipt PB_Startup(M_StartupReceipt *mixer_sr);
diff --git a/src/playback/playback_core_win32.c b/src/playback/playback_win32.c
similarity index 54%
rename from src/playback/playback_core_win32.c
rename to src/playback/playback_win32.c
index 8622fe66..65a523a0 100644
--- a/src/playback/playback_core_win32.c
+++ b/src/playback/playback_win32.c
@@ -1,77 +1,39 @@
-/* ========================== *
- * WASAPI backend for audio playback
+/* WASAPI backend for audio playback
  *
- * Based on mmozeiko's WASAPI example
+ * Based on mmozeiko's WASAPI examples
  * https://gist.github.com/mmozeiko/5a5b168e61aff4c1eaec0381da62808f#file-win32_wasapi-h
- * ========================== */
+ */
 
-#define COBJMACROS
-#define WIN32_LEAN_AND_MEAN
-#define UNICODE
-#include <Windows.h>
-#include <initguid.h>
-#include <objbase.h>
-#include <uuids.h>
-#include <Audioclient.h>
-#include <mmdeviceapi.h>
+PB_WSP_SharedState PB_WSP_shared_state = ZI;
 
-DEFINE_GUID(CLSID_MMDeviceEnumerator, 0xbcde0395, 0xe52f, 0x467c, 0x8e, 0x3d, 0xc4, 0x57, 0x92, 0x91, 0x69, 0x2e);
-DEFINE_GUID(IID_IMMDeviceEnumerator,  0xa95664d2, 0x9614, 0x4f35, 0xa7, 0x46, 0xde, 0x8d, 0xb6, 0x36, 0x17, 0xe6);
-DEFINE_GUID(IID_IAudioClient,         0x1cb9ad4c, 0xdbfa, 0x4c32, 0xb1, 0x78, 0xc2, 0xf5, 0x68, 0xa7, 0x03, 0xb2);
-DEFINE_GUID(IID_IAudioClient3,        0x7ed4ee07, 0x8e67, 0x4cd4, 0x8c, 0x1a, 0x2b, 0x7a, 0x59, 0x87, 0xad, 0x42);
-DEFINE_GUID(IID_IAudioRenderClient,   0xf294acfc, 0x3146, 0x4483, 0xa7, 0xbf, 0xad, 0xdc, 0xa7, 0xc2, 0x60, 0xe2);
+////////////////////////////////
+//~ Startup
 
-#define PLAYBACK_SAMPLE_RATE 48000
-
-struct wasapi_buffer {
-    u32 frames_count;
-    u8 *frames;
-};
-
-Global struct {
-    Atomic32 shutdown;
-    IAudioClient *client;
-    HANDLE event;
-    IAudioRenderClient *playback;
-    WAVEFORMATEX *buffer_format;
-    u32 buffer_frames;
-    P_Counter playback_job_counter;
-} G = ZI, DebugAlias(G, G_playback_wasapi);
-
-/* ========================== *
- * Startup
- * ========================== */
-
-internal void wasapi_initialize(void);
-internal P_ExitFuncDef(playback_shutdown);
-internal P_JobDef(playback_job, _);
-
-PB_StartupReceipt playback_startup(M_StartupReceipt *mixer_sr)
+PB_StartupReceipt PB_Startup(M_StartupReceipt *mixer_sr)
 {
     __prof;
+    PB_WSP_SharedState *g = &PB_WSP_shared_state;
     (UNUSED)mixer_sr;
-    wasapi_initialize();
+    PB_WSP_InitializeWasapi();
     /* Start playback job */
-    P_Run(1, playback_job, 0, P_Pool_Audio, P_Priority_High, &G.playback_job_counter);
-    P_OnExit(&playback_shutdown);
+    P_Run(1, PB_WSP_PlaybackJob, 0, P_Pool_Audio, P_Priority_High, &g->PB_WSP_PlaybackJob_counter);
+    P_OnExit(&PB_WSP_Shutdown);
 
     return (PB_StartupReceipt) { 0 };
 }
 
-internal P_ExitFuncDef(playback_shutdown)
+P_ExitFuncDef(PB_WSP_Shutdown)
 {
     __prof;
-    Atomic32FetchSet(&G.shutdown, 1);
-    P_WaitOnCounter(&G.playback_job_counter);
+    PB_WSP_SharedState *g = &PB_WSP_shared_state;
+    Atomic32FetchSet(&g->shutdown, 1);
+    P_WaitOnCounter(&g->PB_WSP_PlaybackJob_counter);
 }
 
-/* ========================== *
- * Wasapi initialization
- * ========================== */
-
-internal void wasapi_initialize(void)
+void PB_WSP_InitializeWasapi(void)
 {
-    u64 sample_rate = PLAYBACK_SAMPLE_RATE;
+    PB_WSP_SharedState *g = &PB_WSP_shared_state;
+    u64 sample_rate = PB_SampleRate;
     u64 channel_count = 2;
     u32 channel_mask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
 
@@ -85,7 +47,7 @@ internal void wasapi_initialize(void)
     IMMDeviceEnumerator_Release(enumerator);
 
     /* Create audio client for device */
-    IMMDevice_Activate(device, &IID_IAudioClient, CLSCTX_ALL, 0, (LPVOID *)&G.client);
+    IMMDevice_Activate(device, &IID_IAudioClient, CLSCTX_ALL, 0, (LPVOID *)&g->client);
     IMMDevice_Release(device);
 
     WAVEFORMATEXTENSIBLE format_ex = {
@@ -107,7 +69,8 @@ internal void wasapi_initialize(void)
 #if 0
     b32 client_initialized = 0;
     IAudioClient3 *client3;
-    if (SUCCEEDED(IAudioClient_QueryInterface(G.client, &IID_IAudioClient3, (LPVOID *)&client3))) {
+    if (SUCCEEDED(IAudioClient_QueryInterface(g->client, &IID_IAudioClient3, (LPVOID *)&client3)))
+    {
         /* From Martins: Minimum buffer size will typically be 480 samples (10msec @ 48khz)
          * but it can be 128 samples (2.66 msec @ 48khz) if driver is properly installed
          * see bullet-point instructions here: https://learn.microsoft.com/en-us/windows-hardware/drivers/audio/low-latency-audio#measurement-tools
@@ -116,7 +79,8 @@ internal void wasapi_initialize(void)
         IAudioClient3_GetSharedModeEnginePeriod(client3, wfx, &default_period_samples, &fundamental_period_samples, &min_period_samples, &max_period_samples);
 
         const DWORD flags = AUDCLNT_STREAMFLAGS_EVENTCALLBACK;
-        if (SUCCEEDED(IAudioClient3_InitializeSharedAudioStream(client3, flags, min_period_samples, wfx, 0))) {
+        if (SUCCEEDED(IAudioClient3_InitializeSharedAudioStream(client3, flags, min_period_samples, wfx, 0)))
+        {
             client_initialized = 1;
         }
 
@@ -126,10 +90,11 @@ internal void wasapi_initialize(void)
     b32 client_initialized = 0;
 #endif
 
-    if (!client_initialized) {
+    if (!client_initialized)
+    {
         /* Get duration for shared-mode streams, this will typically be 480 samples (10msec @ 48khz) */
         REFERENCE_TIME duration;
-        IAudioClient_GetDevicePeriod(G.client, &duration, 0);
+        IAudioClient_GetDevicePeriod(g->client, &duration, 0);
 
         /* Initialize audio playback
          *
@@ -139,66 +104,71 @@ internal void wasapi_initialize(void)
          * but allows for any input format.
          */
         const DWORD flags = AUDCLNT_STREAMFLAGS_EVENTCALLBACK | AUDCLNT_STREAMFLAGS_AUTOCONVERTPCM | AUDCLNT_STREAMFLAGS_SRC_DEFAULT_QUALITY;
-        IAudioClient_Initialize(G.client, AUDCLNT_SHAREMODE_SHARED, flags, duration, 0, wfx, 0);
+        IAudioClient_Initialize(g->client, AUDCLNT_SHAREMODE_SHARED, flags, duration, 0, wfx, 0);
     }
 
-    IAudioClient_GetMixFormat(G.client, &G.buffer_format);
+    IAudioClient_GetMixFormat(g->client, &g->buffer_format);
 
     /* Set up event handler to wait on */
-    G.event = CreateEventW(0, 0, 0, 0);
-    IAudioClient_SetEventHandle(G.client, G.event);
+    g->event = CreateEventW(0, 0, 0, 0);
+    IAudioClient_SetEventHandle(g->client, g->event);
 
     /* Get playback client */
-    IAudioClient_GetService(G.client, &IID_IAudioRenderClient, (LPVOID *)&G.playback);
+    IAudioClient_GetService(g->client, &IID_IAudioRenderClient, (LPVOID *)&g->playback);
 
     /* Start the playback */
-    IAudioClient_Start(G.client);
+    IAudioClient_Start(g->client);
 
     /* Get audio buffer size in samples */
-    IAudioClient_GetBufferSize(G.client, &G.buffer_frames);
+    IAudioClient_GetBufferSize(g->client, &g->buffer_frames);
 }
 
-/* ========================== *
- * Playback thread update
- * ========================== */
+////////////////////////////////
+//~ Wasapi update
 
-internal struct wasapi_buffer wasapi_update_begin(void)
+PB_WSP_Buff PB_WSP_BeginUpdate(void)
 {
     __prof;
-    struct wasapi_buffer wspbuf = ZI;
+    PB_WSP_SharedState *g = &PB_WSP_shared_state;
+    PB_WSP_Buff wspbuf = ZI;
 
     /* Get padding frames */
     u32 padding_frames;
-    IAudioClient_GetCurrentPadding(G.client, &padding_frames);
+    IAudioClient_GetCurrentPadding(g->client, &padding_frames);
 
     /* Get output buffer from WASAPI */
     wspbuf.frames_count = 0;
-    if (padding_frames <= G.buffer_frames) {
-        wspbuf.frames_count = G.buffer_frames - padding_frames;
+    if (padding_frames <= g->buffer_frames)
+    {
+        wspbuf.frames_count = g->buffer_frames - padding_frames;
     }
-    IAudioRenderClient_GetBuffer(G.playback, wspbuf.frames_count, &wspbuf.frames);
+    IAudioRenderClient_GetBuffer(g->playback, wspbuf.frames_count, &wspbuf.frames);
 
     return wspbuf;
 }
 
-internal void wasapi_update_end(struct wasapi_buffer *wspbuf, M_PcmF32 src)
+void PB_WSP_EndUpdate(PB_WSP_Buff *wspbuf, M_PcmF32 src)
 {
     __prof;
+    PB_WSP_SharedState *g = &PB_WSP_shared_state;
     u32 frames_in_source = src.count / 2;
     u32 frames_in_output = wspbuf->frames_count;
 
     u32 flags = 0;
-    if (frames_in_source == frames_in_output) {
+    if (frames_in_source == frames_in_output)
+    {
         /* Copy bytes to output */
-        u32 bytes_per_sample = G.buffer_format->nBlockAlign / G.buffer_format->nChannels;
+        u32 bytes_per_sample = g->buffer_format->nBlockAlign / g->buffer_format->nChannels;
         u32 write_size = frames_in_source * 2 * bytes_per_sample;
         CopyBytes(wspbuf->frames, src.samples, write_size);
-    } else {
+    }
+    else
+    {
         /* Submit silence if not enough samples */
         flags = AUDCLNT_BUFFERFLAGS_SILENT;
 
         /* This shouldn't occur, mixer should be generating samples equivilent
-         * to value returned from `wasapi_update_begin`. */
+         * to value returned from `PB_WSP_BeginUpdate`. */
         Assert(0);
     }
 
@@ -207,33 +177,34 @@ internal void wasapi_update_end(struct wasapi_buffer *wspbuf, M_PcmF32 src)
 #endif
 
     /* Submit output buffer to WASAPI */
-    IAudioRenderClient_ReleaseBuffer(G.playback, frames_in_source, flags);
+    IAudioRenderClient_ReleaseBuffer(g->playback, frames_in_source, flags);
     __profframe("Audio");
 }
 
-/* ========================== *
- * Playback thread entry
- * ========================== */
+////////////////////////////////
+//~ Playback job
 
-internal P_JobDef(playback_job, _)
+P_JobDef(PB_WSP_PlaybackJob, _)
 {
     __prof;
+    PB_WSP_SharedState *g = &PB_WSP_shared_state;
     (UNUSED)_;
 
     /* FIXME: If playback fails at any point and mixer stops advancing, we
      * need to halt mixer to prevent memory leak when sounds are played. */
      /* TODO: Signal counter that running job wiats on, rather than scheduling job manually */
-    while (!Atomic32Fetch(&G.shutdown)) {
+    while (!Atomic32Fetch(&g->shutdown))
+    {
         TempArena scratch = BeginScratchNoConflict();
         {
             __profn("Wasapi wait");
-            WaitForSingleObject(G.event, INFINITE);
+            WaitForSingleObject(g->event, INFINITE);
         }
         {
             __profn("Fill sample buffer");
-            struct wasapi_buffer wspbuf = wasapi_update_begin();
+            PB_WSP_Buff wspbuf = PB_WSP_BeginUpdate();
             M_PcmF32 pcm = M_MixAllTracks(scratch.arena, wspbuf.frames_count);
-            wasapi_update_end(&wspbuf, pcm);
+            PB_WSP_EndUpdate(&wspbuf, pcm);
         }
         EndScratch(scratch);
     }
diff --git a/src/playback/playback_win32.h b/src/playback/playback_win32.h
new file mode 100644
index 00000000..e8a64476
--- /dev/null
+++ b/src/playback/playback_win32.h
@@ -0,0 +1,64 @@
+////////////////////////////////
+//~ Win32 headers
+
+#pragma warning(push, 0)
+# define COBJMACROS
+# define WIN32_LEAN_AND_MEAN
+# define UNICODE
+# include <Windows.h>
+# include <initguid.h>
+# include <objbase.h>
+# include <uuids.h>
+# include <Audioclient.h>
+# include <mmdeviceapi.h>
+#pragma warning(pop)
+
+DEFINE_GUID(CLSID_MMDeviceEnumerator, 0xbcde0395, 0xe52f, 0x467c, 0x8e, 0x3d, 0xc4, 0x57, 0x92, 0x91, 0x69, 0x2e);
+DEFINE_GUID(IID_IMMDeviceEnumerator,  0xa95664d2, 0x9614, 0x4f35, 0xa7, 0x46, 0xde, 0x8d, 0xb6, 0x36, 0x17, 0xe6);
+DEFINE_GUID(IID_IAudioClient,         0x1cb9ad4c, 0xdbfa, 0x4c32, 0xb1, 0x78, 0xc2, 0xf5, 0x68, 0xa7, 0x03, 0xb2);
+DEFINE_GUID(IID_IAudioClient3,        0x7ed4ee07, 0x8e67, 0x4cd4, 0x8c, 0x1a, 0x2b, 0x7a, 0x59, 0x87, 0xad, 0x42);
+DEFINE_GUID(IID_IAudioRenderClient,   0xf294acfc, 0x3146, 0x4483, 0xa7, 0xbf, 0xad, 0xdc, 0xa7, 0xc2, 0x60, 0xe2);
+
+////////////////////////////////
+//~ Wasapi buffer types
+
+Struct(PB_WSP_Buff)
+{
+    u32 frames_count;
+    u8 *frames;
+};
+
+////////////////////////////////
+//~ Shared state
+
+Struct(PB_WSP_SharedState)
+{
+    Atomic32 shutdown;
+    IAudioClient *client;
+    HANDLE event;
+    IAudioRenderClient *playback;
+    WAVEFORMATEX *buffer_format;
+    u32 buffer_frames;
+    P_Counter PB_WSP_PlaybackJob_counter;
+};
+
+extern PB_WSP_SharedState PB_WSP_shared_state;
+
+////////////////////////////////
+//~ Wasapi startup
+
+void PB_WSP_InitializeWasapi(void);
+P_ExitFuncDef(PB_WSP_Shutdown);
+P_JobDef(PB_WSP_PlaybackJob, _);
+P_ExitFuncDef(PB_WSP_Shutdown);
+
+////////////////////////////////
+//~ Playback update
+
+PB_WSP_Buff PB_WSP_BeginUpdate(void);
+void PB_WSP_EndUpdate(PB_WSP_Buff *wspbuf, M_PcmF32 src);
+
+////////////////////////////////
+//~ Playback job
+
+P_JobDef(PB_WSP_PlaybackJob, _);
diff --git a/src/ttf/ttf_core_dwrite.cpp b/src/ttf/ttf_core_dwrite.cpp
index 64f51391..a2836f83 100644
--- a/src/ttf/ttf_core_dwrite.cpp
+++ b/src/ttf/ttf_core_dwrite.cpp
@@ -1,7 +1,10 @@
 /* Based on Allen Webster's dwrite rasterizer example -
  * https://github.com/4th-dimention/examps */
 
+#define WIN32_LEAN_AND_MEAN
+#define UNICODE
 #pragma warning(push, 0)
+# include <Windows.h>
 # include <dwrite.h>
 # include <dwrite_3.h>
 #pragma warning(pop)