Don't omit backend-specific attributes in structures.

The rationale behind this commit is to ensure the size of each data
structure remains consistent regardless of which backends are enabled
and disabled. This is important for mini_al because it publicly exposes
every struct.

mini_al.h

@@ -42,9 +42,9 @@
 //
 // You can then #include this file in other parts of the program as you would with any other header file.
 //
-// The implementation of this library will try #including necessary headers for each backend. If you do not have
+// The implementation of this library will try #include-ing necessary headers for each backend. If you do not have
 // the development packages for any particular backend you can disable it by #define-ing the appropriate MAL_NO_*
-// option.
+// option before #include-ing the implementation.
 //
 //
 // Building (Windows)
@@ -329,22 +329,11 @@ typedef enum
 typedef union
 {
     // Just look at this shit...
-#if defined(MAL_ENABLE_OPENSLES)
     mal_uint32 id32;    // OpenSL|ES uses a 32-bit unsigned integer for identification.
-#endif
-#if defined(MAL_ENABLE_ALSA)
     char str[32];       // ALSA uses a name string for identification.
-#endif
-#if defined(MAL_ENABLE_DSOUND)
     mal_uint8 guid[16]; // DirectSound uses a GUID for identification.
-#endif
-#if defined(MAL_ENABLE_WASAPI)
     wchar_t wstr[64];   // WASAPI uses a wchar_t string for identification which is also annoyingly long...
-#endif
-#if defined(MAL_ENABLE_OPENAL)
     char openal[256];   // OpenAL uses human-readable device names as the ID which is so flippin' stupid...
-#endif
-    int null; // <-- Just to ensure compilation works when no backends are enabled.
 } mal_device_id;
 
 typedef struct
@@ -377,36 +366,27 @@ typedef struct
 
     union
     {
-    #ifdef MAL_ENABLE_WASAPI
         struct
         {
             /*IMMDeviceEnumerator**/ mal_ptr pDeviceEnumerator;
             mal_bool32 needCoUninit;    // Whether or not COM needs to be uninitialized.
         } wasapi;
-    #endif
 
-    #ifdef MAL_ENABLE_DSOUND
         struct
         {
             /*HMODULE*/ mal_handle hDSoundDLL;
         } dsound;
-    #endif
 
-    #ifdef MAL_ENABLE_ALSA
         struct
         {
             int _unused;
         } alsa;
-    #endif
 
-    #ifdef MAL_ENABLE_OPENSLES
         struct
         {
             int _unused;
         } sles;
-    #endif
 
-    #ifdef MAL_ENABLE_OPENAL
         struct
         {
             /*HMODULE*/ mal_handle hOpenAL;     // OpenAL32.dll, etc.
@@ -491,16 +471,11 @@ typedef struct
 
             mal_uint32 isFloat32Supported;
         } openal;
-    #endif
 
-    #ifdef MAL_ENABLE_NULL
         struct
         {
             int _unused;
         } null_device;
-    #endif
-
-        int _unused; // Only used to ensure mini_al compiles when all backends have been disabled.
     };
 } mal_context;
 
@@ -531,7 +506,6 @@ struct mal_device
 
     union
     {
-    #ifdef MAL_ENABLE_WASAPI
         struct
         {
             /*IMMDevice**/ mal_ptr pDevice;
@@ -542,9 +516,7 @@ struct mal_device
             mal_bool32 needCoUninit;    // Whether or not COM needs to be uninitialized.
             mal_bool32 breakFromMainLoop;
         } wasapi;
-    #endif
 
-    #ifdef MAL_ENABLE_DSOUND
         struct
         {
             /*HMODULE*/ mal_handle hDSoundDLL;
@@ -559,9 +531,7 @@ struct mal_device
             mal_uint32 lastProcessedFrame;      // This is circular.
             mal_bool32 breakFromMainLoop;
         } dsound;
-    #endif
 
-    #ifdef MAL_ENABLE_ALSA
         struct
         {
             /*snd_pcm_t**/ mal_ptr pPCM;
@@ -569,9 +539,7 @@ struct mal_device
             mal_bool32 breakFromMainLoop;
             void* pIntermediaryBuffer;
         } alsa;
-    #endif
 
-    #ifdef MAL_ENABLE_OPENSLES
         struct
         {
             /*SLObjectItf*/ mal_ptr pOutputMixObj;
@@ -585,9 +553,7 @@ struct mal_device
             mal_uint32 currentBufferIndex;
             mal_uint8* pBuffer;                 // This is malloc()'d and is used for storing audio data. Typed as mal_uint8 for easy offsetting.
         } sles;
-    #endif
 
-    #ifdef MAL_ENABLE_OPENAL
         struct
         {
             /*ALCcontext**/ mal_ptr pContextALC;
@@ -600,9 +566,7 @@ struct mal_device
             mal_uint32 iNextBuffer;             // The next buffer to unenqueue and then re-enqueue as new data is read.
             mal_bool32 breakFromMainLoop;
         } openal;
-    #endif
 
-    #ifdef MAL_ENABLE_NULL
         struct
         {
             mal_timer timer;
@@ -610,9 +574,6 @@ struct mal_device
             mal_bool32 breakFromMainLoop;
             mal_uint8* pBuffer;                 // This is malloc()'d and is used as the destination for reading from the client. Typed as mal_uint8 for easy offsetting.
         } null_device;
-    #endif
-
-        int _unused; // Only used to ensure mini_al compiles when all backends have been disabled.
     };
 };