X-Git-Url: https://git.jsancho.org/?a=blobdiff_plain;f=Source%2Fopenal_wrapper.cpp;h=e316da4cea3f066a584888826f482901c699ae5a;hb=5509b55dbc13227bdc7b97f2934fa71dad02cc66;hp=be2a72a409c8907189c3f72508f43dc75af230c6;hpb=e461301cf208b5b8e6bede9e8989972fedcc2c76;p=lugaru.git

diff --git a/Source/openal_wrapper.cpp b/Source/openal_wrapper.cpp
index be2a72a..e316da4 100644
--- a/Source/openal_wrapper.cpp
+++ b/Source/openal_wrapper.cpp
@@ -1,184 +1,156 @@
+/*
+Copyright (C) 2003, 2010 - Wolfire Games
+Copyright (C) 2010-2016 - Lugaru contributors (see AUTHORS file)
 
-#if USE_OPENAL
+This file is part of Lugaru.
+
+Lugaru is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+Lugaru is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Lugaru.  If not, see <http://www.gnu.org/licenses/>.
+*/
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
-#include "MacCompatibility.h"
-#include "fmod.h"
-
-#include "AL/al.h"
-#include "AL/alc.h"
-
-#include "ogg/ogg.h"
-#include "vorbis/vorbisfile.h"
+#include "Quaternions.h"
+#include "openal_wrapper.h"
+#include "Sounds.h"
 
 // NOTE:
 // FMOD uses a Left Handed Coordinate system, OpenAL uses a Right Handed
 //  one...so we just need to flip the sign on the Z axis when appropriate.
 
-
-#define DYNAMIC_LOAD_OPENAL 0
-
-#if DYNAMIC_LOAD_OPENAL
-
-#include <dlfcn.h>
-
-#define AL_FUNC(t,ret,fn,params,call,rt) \
-    extern "C" { \
-        static ret ALAPIENTRY (*p##fn) params = NULL; \
-        ret ALAPIENTRY fn params { rt p##fn call; } \
-    }
-#include "alstubs.h"
-#undef AL_FUNC
-
-static void *aldlhandle = NULL;
-
-static bool lookup_alsym(const char *funcname, void **func, const char *libname)
-{
-    if (!aldlhandle)
-        return false;
-
-    *func = dlsym(aldlhandle, funcname);
-    if (*func == NULL)
-    {
-        fprintf(stderr, "Failed to find OpenAL symbol \"%s\" in \"%s\"\n",
-                 funcname, libname);
-        return false;
-    }
-    return true;
-}
-
-static void unload_alsyms(void)
-{
-    #define AL_FUNC(t,ret,fn,params,call,rt) p##fn = NULL;
-    #include "alstubs.h"
-    #undef AL_FUNC
-    if (aldlhandle)
-    {
-        dlclose(aldlhandle);
-        aldlhandle = NULL;
-    }
-}
-
-static bool lookup_all_alsyms(const char *libname)
-{
-    if (!aldlhandle)
-    {
-        if ( (aldlhandle = dlopen(libname, RTLD_GLOBAL | RTLD_NOW)) == NULL )
-            return false;
-    }
-
-    bool retval = true;
-    #define AL_FUNC(t,ret,fn,params,call,rt) \
-        if (!lookup_alsym(#fn, (void **) &p##fn, libname)) retval = false;
-    #include "alstubs.h"
-    #undef AL_FUNC
-
-    if (!retval)
-        unload_alsyms();
-
-    return retval;
-}
-#else
-#define lookup_all_alsyms(x) (true)
-#define unload_alsyms()
-#endif
-
-
-typedef struct
-{
+typedef struct {
     ALuint sid;
-    FSOUND_SAMPLE *sample;
+    OPENAL_SAMPLE *sample;
     bool startpaused;
+    float position[3];
 } OPENAL_Channels;
 
-typedef struct FSOUND_SAMPLE
-{
-    char *name;
-    ALuint bid;  // buffer id.
-    int mode;
-    int is2d;
-} FSOUND_SAMPLE;
-
-typedef struct FSOUND_STREAM
-{
+typedef struct OPENAL_SAMPLE {
     char *name;
     ALuint bid;  // buffer id.
     int mode;
     int is2d;
-} FSOUND_STREAM;
+} OPENAL_SAMPLE;
 
 static size_t num_channels = 0;
-static OPENAL_Channels *channels = NULL;
+static OPENAL_Channels *impl_channels = NULL;
 static bool initialized = false;
+static float listener_position[3];
+
+static void set_channel_position(const int channel, const float x,
+                                 const float y, const float z)
+{
+    OPENAL_Channels *chan = &impl_channels[channel];
+
+    chan->position[0] = x;
+    chan->position[1] = y;
+    chan->position[2] = z;
+
+    OPENAL_SAMPLE *sptr = chan->sample;
+    if (sptr == NULL)
+        return;
+
+    const ALuint sid = chan->sid;
+    const bool no_attenuate = sptr->is2d;
+
+    if (no_attenuate) {
+        alSourcei(sid, AL_SOURCE_RELATIVE, AL_TRUE);
+        alSource3f(sid, AL_POSITION, 0.0f, 0.0f, 0.0f);
+    } else {
+        alSourcei(sid, AL_SOURCE_RELATIVE, AL_FALSE);
+        alSource3f(sid, AL_POSITION, x, y, z);
+    }
+}
 
 
-void F_API OPENAL_3D_Listener_SetAttributes(const float *pos, const float *vel, float fx, float fy, float fz, float tx, float ty, float tz)
+AL_API void OPENAL_3D_Listener_SetAttributes(const float *pos, const float *vel, float fx, float fy, float fz, float tx, float ty, float tz)
 {
-    if (!initialized) return;
-    if (pos != NULL)
+    if (!initialized)
+        return;
+    if (pos != NULL) {
         alListener3f(AL_POSITION, pos[0], pos[1], -pos[2]);
+        listener_position[0] = pos[0];
+        listener_position[1] = pos[1];
+        listener_position[2] = -pos[2];
+    }
+
     ALfloat vec[6] = { fx, fy, -fz, tz, ty, -tz };
     alListenerfv(AL_ORIENTATION, vec);
 
     // we ignore velocity, since doppler's broken in the Linux AL at the moment...
+
+    // adjust existing positions...
+    for (int i = 0; i < num_channels; i++) {
+        const float *p = impl_channels[i].position;
+        set_channel_position(i, p[0], p[1], p[2]);
+    }
 }
 
-signed char F_API OPENAL_3D_SetAttributes(int channel, const float *pos, const float *vel)
+AL_API signed char OPENAL_3D_SetAttributes(int channel, const float *pos, const float *vel)
 {
-    if (!initialized) return FALSE;
-    if ((channel < 0) || (channel >= num_channels)) return FALSE;
+    if (!initialized)
+        return false;
+    if ((channel < 0) || (channel >= num_channels))
+        return false;
 
-    if ((pos != NULL) && (!channels[channel].sample->is2d))
-        alSource3f(channels[channel].sid, AL_POSITION, pos[0], pos[1], -pos[2]);
+    if (pos != NULL)
+        set_channel_position(channel, pos[0], pos[1], -pos[2]);
 
     // we ignore velocity, since doppler's broken in the Linux AL at the moment...
-    return TRUE;
+
+    return true;
 }
 
-void F_API OPENAL_3D_SetDopplerFactor(float scale)
+AL_API signed char OPENAL_3D_SetAttributes_(int channel, const XYZ &pos, const float *vel)
 {
-    if (!initialized) return;
-    // unimplemented...looks like init routines just call this with scale == 0.0f anyhow.
+    if (!initialized)
+        return false;
+    if ((channel < 0) || (channel >= num_channels))
+        return false;
+
+    set_channel_position(channel, pos.x, pos.y, -pos.z);
+
+    return true;
 }
 
-signed char F_API OPENAL_Init(int mixrate, int maxsoftwarechannels, unsigned int flags)
+AL_API signed char OPENAL_Init(int mixrate, int maxsoftwarechannels, unsigned int flags)
 {
-    if (initialized) return FALSE;
-    if (maxsoftwarechannels == 0) return FALSE;
+    if (initialized)
+        return false;
+    if (maxsoftwarechannels == 0)
+        return false;
 
     if (flags != 0)  // unsupported.
-        return FALSE;
-
-    if (!lookup_all_alsyms("./openal.so"))  // !!! FIXME: linux specific lib name
-    {
-        if (!lookup_all_alsyms("openal.so.1"))  // !!! FIXME: linux specific lib name
-        {
-            if (!lookup_all_alsyms("openal.so"))  // !!! FIXME: linux specific lib name
-                return FALSE;
-        }
-    }
+        return false;
 
     ALCdevice *dev = alcOpenDevice(NULL);
     if (!dev)
-        return FALSE;
+        return false;
 
     ALint caps[] = { ALC_FREQUENCY, mixrate, 0 };
     ALCcontext *ctx = alcCreateContext(dev, caps);
-    if (!ctx)
-    {
+    if (!ctx) {
         alcCloseDevice(dev);
-        return FALSE;
+        return false;
     }
 
     alcMakeContextCurrent(ctx);
     alcProcessContext(ctx);
 
-    bool cmdline(const char *cmd);
-    if (cmdline("openalinfo"))
-    {
+    bool cmdline(const char * cmd);
+    if (cmdline("openalinfo")) {
         printf("AL_VENDOR: %s\n", (char *) alGetString(AL_VENDOR));
         printf("AL_RENDERER: %s\n", (char *) alGetString(AL_RENDERER));
         printf("AL_VERSION: %s\n", (char *) alGetString(AL_VERSION));
@@ -186,27 +158,26 @@ signed char F_API OPENAL_Init(int mixrate, int maxsoftwarechannels, unsigned int
     }
 
     num_channels = maxsoftwarechannels;
-    channels = new OPENAL_Channels[maxsoftwarechannels];
-    memset(channels, '\0', sizeof (OPENAL_Channels) * num_channels);
+    impl_channels = new OPENAL_Channels[maxsoftwarechannels];
+    memset(impl_channels, '\0', sizeof (OPENAL_Channels) * num_channels);
     for (int i = 0; i < num_channels; i++)
-        alGenSources(1, &channels[i].sid);  // !!! FIXME: verify this didn't fail!
+        alGenSources(1, &impl_channels[i].sid);  // !!! FIXME: verify this didn't fail!
 
     initialized = true;
-    return TRUE;
+    return true;
 }
 
-void F_API OPENAL_Close()
+AL_API void OPENAL_Close()
 {
-    if (!initialized) return;
+    if (!initialized)
+        return;
 
     ALCcontext *ctx = alcGetCurrentContext();
-    if (ctx)
-    {
-        for (int i = 0; i < num_channels; i++)
-        {
-            alSourceStop(channels[i].sid);
-            alSourcei(channels[i].sid, AL_BUFFER, 0);
-            alDeleteSources(1, &channels[i].sid);
+    if (ctx) {
+        for (int i = 0; i < num_channels; i++) {
+            alSourceStop(impl_channels[i].sid);
+            alSourcei(impl_channels[i].sid, AL_BUFFER, 0);
+            alDeleteSources(1, &impl_channels[i].sid);
         }
         ALCdevice *dev = alcGetContextsDevice(ctx);
         alcMakeContextCurrent(NULL);
@@ -216,82 +187,89 @@ void F_API OPENAL_Close()
     }
 
     num_channels = 0;
-    delete[] channels;
-    channels = NULL;
+    delete[] impl_channels;
+    impl_channels = NULL;
 
-    unload_alsyms();
     initialized = false;
 }
 
-FSOUND_SAMPLE *F_API OPENAL_GetCurrentSample(int channel)
+static OPENAL_SAMPLE *OPENAL_GetCurrentSample(int channel)
 {
-    if (!initialized) return NULL;
-    if ((channel < 0) || (channel >= num_channels)) return NULL;
-    return channels[channel].sample;
+    if (!initialized)
+        return NULL;
+    if ((channel < 0) || (channel >= num_channels))
+        return NULL;
+    return impl_channels[channel].sample;
 }
 
-signed char F_API OPENAL_GetPaused(int channel)
+static signed char OPENAL_GetPaused(int channel)
 {
-    if (!initialized) return FALSE;
-    if ((channel < 0) || (channel >= num_channels)) return FALSE;
-    if (channels[channel].startpaused)
-        return(TRUE);
+    if (!initialized)
+        return false;
+    if ((channel < 0) || (channel >= num_channels))
+        return false;
+    if (impl_channels[channel].startpaused)
+        return(true);
 
     ALint state = 0;
-    alGetSourceiv(channels[channel].sid, AL_SOURCE_STATE, &state);
-    return((state == AL_PAUSED) ? TRUE : FALSE);
+    alGetSourceiv(impl_channels[channel].sid, AL_SOURCE_STATE, &state);
+    return((state == AL_PAUSED) ? true : false);
 }
 
-unsigned int F_API OPENAL_GetLoopMode(int channel)
+static unsigned int OPENAL_GetLoopMode(int channel)
 {
-    if (!initialized) return 0;
-    if ((channel < 0) || (channel >= num_channels)) return 0;
+    if (!initialized)
+        return 0;
+    if ((channel < 0) || (channel >= num_channels))
+        return 0;
     ALint loop = 0;
-    alGetSourceiv(channels[channel].sid, AL_LOOPING, &loop);
+    alGetSourceiv(impl_channels[channel].sid, AL_LOOPING, &loop);
     if (loop)
-        return(FSOUND_LOOP_NORMAL);
-    return FSOUND_LOOP_OFF;
+        return(OPENAL_LOOP_NORMAL);
+    return OPENAL_LOOP_OFF;
 }
 
-signed char F_API OPENAL_IsPlaying(int channel)
+static signed char OPENAL_IsPlaying(int channel)
 {
-    if (!initialized) return FALSE;
-    if ((channel < 0) || (channel >= num_channels)) return FALSE;
+    if (!initialized)
+        return false;
+    if ((channel < 0) || (channel >= num_channels))
+        return false;
     ALint state = 0;
-    alGetSourceiv(channels[channel].sid, AL_SOURCE_STATE, &state);
-    return((state == AL_PLAYING) ? TRUE : FALSE);
+    alGetSourceiv(impl_channels[channel].sid, AL_SOURCE_STATE, &state);
+    return((state == AL_PLAYING) ? true : false);
 }
 
-int F_API OPENAL_PlaySoundEx(int channel, FSOUND_SAMPLE *sptr, FSOUND_DSPUNIT *dsp, signed char startpaused)
+static int OPENAL_PlaySoundEx(int channel, OPENAL_SAMPLE *sptr, OPENAL_DSPUNIT *dsp, signed char startpaused)
 {
-    if (!initialized) return -1;
-    if (sptr == NULL) return -1;
-    if (dsp != NULL) return -1;
-    if (channel == FSOUND_FREE)
-    {
-        for (int i = 0; i < num_channels; i++)
-        {
+    if (!initialized)
+        return -1;
+    if (sptr == NULL)
+        return -1;
+    if (dsp != NULL)
+        return -1;
+    if (channel == OPENAL_FREE) {
+        for (int i = 0; i < num_channels; i++) {
             ALint state = 0;
-            alGetSourceiv(channels[i].sid, AL_SOURCE_STATE, &state);
-            if ((state != AL_PLAYING) && (state != AL_PAUSED))
-            {
+            alGetSourceiv(impl_channels[i].sid, AL_SOURCE_STATE, &state);
+            if ((state != AL_PLAYING) && (state != AL_PAUSED)) {
                 channel = i;
                 break;
             }
         }
     }
 
-    if ((channel < 0) || (channel >= num_channels)) return -1;
-    alSourceStop(channels[channel].sid);
-    channels[channel].sample = sptr;
-    alSourcei(channels[channel].sid, AL_BUFFER, sptr->bid);
-    alSourcei(channels[channel].sid, AL_LOOPING, (sptr->mode == FSOUND_LOOP_OFF) ? AL_FALSE : AL_TRUE);
-    alSourcei(channels[channel].sid, AL_SOURCE_RELATIVE, (sptr->is2d) ? AL_TRUE : AL_FALSE);
-    alSource3f(channels[channel].sid, AL_POSITION, 0.0f, 0.0f, 0.0f);
+    if ((channel < 0) || (channel >= num_channels))
+        return -1;
+    alSourceStop(impl_channels[channel].sid);
+    impl_channels[channel].sample = sptr;
+    alSourcei(impl_channels[channel].sid, AL_BUFFER, sptr->bid);
+    alSourcei(impl_channels[channel].sid, AL_LOOPING, (sptr->mode == OPENAL_LOOP_OFF) ? AL_FALSE : AL_TRUE);
+    set_channel_position(channel, 0.0f, 0.0f, 0.0f);
 
-    channels[channel].startpaused = ((startpaused) ? true : false);
+    impl_channels[channel].startpaused = ((startpaused) ? true : false);
     if (!startpaused)
-        alSourcePlay(channels[channel].sid);
+        alSourcePlay(impl_channels[channel].sid);
     return channel;
 }
 
@@ -308,21 +286,21 @@ static void *decode_to_pcm(const char *_fname, ALenum &format, ALsizei &size, AL
     char *fname = (char *) alloca(strlen(_fname) + 16);
     strcpy(fname, _fname);
     char *ptr = strchr(fname, '.');
-    if (ptr) *ptr = NULL;
+    if (ptr)
+        *ptr = '\0';
     strcat(fname, ".ogg");
 
     // just in case...
-    #undef fopen
+#undef fopen
     FILE *io = fopen(fname, "rb");
     if (io == NULL)
         return NULL;
 
     ALubyte *retval = NULL;
 
-    #if 0  // untested, so disable this!
+#if 0  // untested, so disable this!
     // Can we just feed it to the AL compressed?
-    if (alIsExtensionPresent((const ALubyte *) "AL_EXT_vorbis"))
-    {
+    if (alIsExtensionPresent((const ALubyte *) "AL_EXT_vorbis")) {
         format = alGetEnumValue((const ALubyte *) "AL_FORMAT_VORBIS_EXT");
         freq = 44100;
         fseek(io, 0, SEEK_END);
@@ -331,28 +309,25 @@ static void *decode_to_pcm(const char *_fname, ALenum &format, ALsizei &size, AL
         retval = (ALubyte *) malloc(size);
         size_t rc = fread(retval, size, 1, io);
         fclose(io);
-        if (rc != 1)
-        {
+        if (rc != 1) {
             free(retval);
             return NULL;
         }
         return retval;
     }
-    #endif
+#endif
 
     // Uncompress and feed to the AL.
     OggVorbis_File vf;
     memset(&vf, '\0', sizeof (vf));
-    if (ov_open(io, &vf, NULL, 0) == 0)
-    {
+    if (ov_open(io, &vf, NULL, 0) == 0) {
         int bitstream = 0;
         vorbis_info *info = ov_info(&vf, -1);
         size = 0;
         format = (info->channels == 1) ? AL_FORMAT_MONO16 : AL_FORMAT_STEREO16;
         freq = info->rate;
 
-        if ((info->channels != 1) && (info->channels != 2))
-        {
+        if ((info->channels != 1) && (info->channels != 2)) {
             ov_clear(&vf);
             return NULL;
         }
@@ -361,17 +336,13 @@ static void *decode_to_pcm(const char *_fname, ALenum &format, ALsizei &size, AL
         long rc = 0;
         size_t allocated = 64 * 1024;
         retval = (ALubyte *) malloc(allocated);
-        while ( (rc = ov_read(&vf, buf, sizeof (buf), bigendian, 2, 1, &bitstream)) != 0 )
-        {
-            if (rc > 0)
-            {
+        while ( (rc = ov_read(&vf, buf, sizeof (buf), bigendian, 2, 1, &bitstream)) != 0 ) {
+            if (rc > 0) {
                 size += rc;
-                if (size >= allocated)
-                {
+                if (size >= allocated) {
                     allocated *= 2;
                     ALubyte *tmp = (ALubyte *) realloc(retval, allocated);
-                    if (tmp == NULL)
-                    {
+                    if (tmp == NULL) {
                         free(retval);
                         retval = NULL;
                         break;
@@ -390,15 +361,20 @@ static void *decode_to_pcm(const char *_fname, ALenum &format, ALsizei &size, AL
 }
 
 
-FSOUND_SAMPLE * F_API OPENAL_Sample_Load(int index, const char *name_or_data, unsigned int mode, int offset, int length)
+AL_API OPENAL_SAMPLE *OPENAL_Sample_Load(int index, const char *name_or_data, unsigned int mode, int offset, int length)
 {
-    if (!initialized) return NULL;
-    if (index != FSOUND_FREE) return NULL;  // this is all the game does...
-    if (offset != 0) return NULL;  // this is all the game does...
-    if (length != 0) return NULL;  // this is all the game does...
-    if ((mode != FSOUND_HW3D) && (mode != FSOUND_2D)) return NULL;  // this is all the game does...
-
-    FSOUND_SAMPLE *retval = NULL;
+    if (!initialized)
+        return NULL;
+    if (index != OPENAL_FREE)
+        return NULL;  // this is all the game does...
+    if (offset != 0)
+        return NULL;  // this is all the game does...
+    if (length != 0)
+        return NULL;  // this is all the game does...
+    if ((mode != OPENAL_HW3D) && (mode != OPENAL_2D))
+        return NULL;  // this is all the game does...
+
+    OPENAL_SAMPLE *retval = NULL;
     ALuint bufferName = 0;
     ALenum format = AL_NONE;
     ALsizei size = 0;
@@ -410,13 +386,12 @@ FSOUND_SAMPLE * F_API OPENAL_Sample_Load(int index, const char *name_or_data, un
     ALuint bid = 0;
     alGetError();
     alGenBuffers(1, &bid);
-    if (alGetError() == AL_NO_ERROR)
-    {
+    if (alGetError() == AL_NO_ERROR) {
         alBufferData(bid, format, data, size, frequency);
-        retval = new FSOUND_SAMPLE;
+        retval = new OPENAL_SAMPLE;
         retval->bid = bid;
-        retval->mode = FSOUND_LOOP_OFF;
-        retval->is2d = (mode == FSOUND_2D);
+        retval->mode = OPENAL_LOOP_OFF;
+        retval->is2d = (mode == OPENAL_2D);
         retval->name = new char[strlen(name_or_data) + 1];
         if (retval->name)
             strcpy(retval->name, name_or_data);
@@ -426,18 +401,16 @@ FSOUND_SAMPLE * F_API OPENAL_Sample_Load(int index, const char *name_or_data, un
     return(retval);
 }
 
-void F_API OPENAL_Sample_Free(FSOUND_SAMPLE *sptr)
+AL_API void OPENAL_Sample_Free(OPENAL_SAMPLE *sptr)
 {
-    if (!initialized) return;
-    if (sptr)
-    {
-        for (int i = 0; i < num_channels; i++)
-        {
-            if (channels[i].sample == sptr)
-            {
-                alSourceStop(channels[i].sid);
-                alSourcei(channels[i].sid, AL_BUFFER, 0);
-                channels[i].sample = NULL;
+    if (!initialized)
+        return;
+    if (sptr) {
+        for (int i = 0; i < num_channels; i++) {
+            if (impl_channels[i].sample == sptr) {
+                alSourceStop(impl_channels[i].sid);
+                alSourcei(impl_channels[i].sid, AL_BUFFER, 0);
+                impl_channels[i].sample = NULL;
             }
         }
         alDeleteBuffers(1, &sptr->bid);
@@ -446,164 +419,196 @@ void F_API OPENAL_Sample_Free(FSOUND_SAMPLE *sptr)
     }
 }
 
-signed char F_API OPENAL_Sample_SetMode(FSOUND_SAMPLE *sptr, unsigned int mode)
+static signed char OPENAL_Sample_SetMode(OPENAL_SAMPLE *sptr, unsigned int mode)
 {
-    if (!initialized) return FALSE;
-    if ((mode != FSOUND_LOOP_NORMAL) && (mode != FSOUND_LOOP_OFF)) return FALSE;
-    if (!sptr) return FALSE;
+    if (!initialized)
+        return false;
+    if ((mode != OPENAL_LOOP_NORMAL) && (mode != OPENAL_LOOP_OFF))
+        return false;
+    if (!sptr)
+        return false;
     sptr->mode = mode;
-    return TRUE;
-}
-
-signed char F_API OPENAL_Sample_SetMinMaxDistance(FSOUND_SAMPLE *sptr, float min, float max)
-{
-    if (!initialized) return FALSE;
-    if (sptr == NULL) return FALSE;
-    // !!! FIXME: write me
-    return 0;
+    return true;
 }
 
-signed char F_API OPENAL_SetFrequency(int channel, int freq)
+AL_API signed char OPENAL_SetFrequency(int channel, int freq)
 {
-    if (!initialized) return FALSE;
-    if (channel == FSOUND_ALL)
-    {
+    if (!initialized)
+        return false;
+    if (channel == OPENAL_ALL) {
         for (int i = 0; i < num_channels; i++)
             OPENAL_SetFrequency(i, freq);
-        return TRUE;
+        return true;
     }
 
-    if ((channel < 0) || (channel >= num_channels)) return FALSE;
-    if (freq == 8012)  // hack
-        alSourcef(channels[channel].sid, AL_PITCH, 8012.0f / 44100.0f);
+    if ((channel < 0) || (channel >= num_channels))
+        return false;
+    if (freq == 8012)
+        // hack
+        alSourcef(impl_channels[channel].sid, AL_PITCH, 8012.0f / 44100.0f);
     else
-        alSourcef(channels[channel].sid, AL_PITCH, 1.0f);
-    return TRUE;
+        alSourcef(impl_channels[channel].sid, AL_PITCH, 1.0f);
+    return true;
 }
 
-signed char F_API OPENAL_SetVolume(int channel, int vol)
+AL_API signed char OPENAL_SetVolume(int channel, int vol)
 {
-    if (!initialized) return FALSE;
+    if (!initialized)
+        return false;
 
-    if (channel == FSOUND_ALL)
-    {
+    if (channel == OPENAL_ALL) {
         for (int i = 0; i < num_channels; i++)
             OPENAL_SetVolume(i, vol);
-        return TRUE;
+        return true;
     }
 
-    if ((channel < 0) || (channel >= num_channels)) return FALSE;
+    if ((channel < 0) || (channel >= num_channels))
+        return false;
 
-    if (vol < 0) vol = 0;
-    else if (vol > 255) vol = 255;
+    if (vol < 0)
+        vol = 0;
+    else if (vol > 255)
+        vol = 255;
     ALfloat gain = ((ALfloat) vol) / 255.0f;
-    alSourcef(channels[channel].sid, AL_GAIN, gain);
-    return TRUE;
+    alSourcef(impl_channels[channel].sid, AL_GAIN, gain);
+    return true;
 }
 
-signed char F_API OPENAL_SetPaused(int channel, signed char paused)
+AL_API signed char OPENAL_SetPaused(int channel, signed char paused)
 {
-    if (!initialized) return FALSE;
+    if (!initialized)
+        return false;
 
-    if (channel == FSOUND_ALL)
-    {
+    if (channel == OPENAL_ALL) {
         for (int i = 0; i < num_channels; i++)
             OPENAL_SetPaused(i, paused);
-        return TRUE;
+        return true;
     }
 
-    if ((channel < 0) || (channel >= num_channels)) return FALSE;
+    if ((channel < 0) || (channel >= num_channels))
+        return false;
 
     ALint state = 0;
-    if (channels[channel].startpaused)
+    if (impl_channels[channel].startpaused)
         state = AL_PAUSED;
     else
-        alGetSourceiv(channels[channel].sid, AL_SOURCE_STATE, &state);
+        alGetSourceiv(impl_channels[channel].sid, AL_SOURCE_STATE, &state);
 
     if ((paused) && (state == AL_PLAYING))
-        alSourcePause(channels[channel].sid);
-    else if ((!paused) && (state == AL_PAUSED))
-    {
-        alSourcePlay(channels[channel].sid);
-        channels[channel].startpaused = false;
+        alSourcePause(impl_channels[channel].sid);
+    else if ((!paused) && (state == AL_PAUSED)) {
+        alSourcePlay(impl_channels[channel].sid);
+        impl_channels[channel].startpaused = false;
     }
-    return TRUE;
+    return true;
 }
 
-void F_API OPENAL_SetSFXMasterVolume(int volume)
+AL_API void OPENAL_SetSFXMasterVolume(int volume)
 {
-    if (!initialized) return;
+    if (!initialized)
+        return;
     ALfloat gain = ((ALfloat) volume) / 255.0f;
     alListenerf(AL_GAIN, gain);
 }
 
-signed char F_API OPENAL_StopSound(int channel)
+AL_API signed char OPENAL_StopSound(int channel)
 {
-    if (!initialized) return FALSE;
+    if (!initialized)
+        return false;
 
-    if (channel == FSOUND_ALL)
-    {
+    if (channel == OPENAL_ALL) {
         for (int i = 0; i < num_channels; i++)
             OPENAL_StopSound(i);
-        return TRUE;
+        return true;
     }
 
-    if ((channel < 0) || (channel >= num_channels)) return FALSE;
-    alSourceStop(channels[channel].sid);
-    channels[channel].startpaused = false;
-    return TRUE;
+    if ((channel < 0) || (channel >= num_channels))
+        return false;
+    alSourceStop(impl_channels[channel].sid);
+    impl_channels[channel].startpaused = false;
+    return true;
 }
 
-FSOUND_STREAM * F_API OPENAL_Stream_Open(const char *name_or_data, unsigned int mode, int offset, int length)
+static OPENAL_SAMPLE *OPENAL_Stream_GetSample(OPENAL_STREAM *stream)
 {
-    return (FSOUND_STREAM *) OPENAL_Sample_Load(FSOUND_FREE, name_or_data, mode, offset, length);
+    if (!initialized)
+        return NULL;
+    return (OPENAL_SAMPLE *) stream;
 }
 
-signed char F_API OPENAL_Stream_Close(FSOUND_STREAM *stream)
+static int OPENAL_Stream_PlayEx(int channel, OPENAL_STREAM *stream, OPENAL_DSPUNIT *dsp, signed char startpaused)
 {
-    OPENAL_Sample_Free((FSOUND_SAMPLE *) stream);
+    return OPENAL_PlaySoundEx(channel, (OPENAL_SAMPLE *) stream, dsp, startpaused);
 }
 
-FSOUND_SAMPLE * F_API OPENAL_Stream_GetSample(FSOUND_STREAM *stream)
+static signed char OPENAL_Stream_Stop(OPENAL_STREAM *stream)
 {
-    if (!initialized) return NULL;
-    return (FSOUND_SAMPLE *) stream;
+    if (!initialized)
+        return false;
+    for (int i = 0; i < num_channels; i++) {
+        if (impl_channels[i].sample == (OPENAL_SAMPLE *) stream) {
+            alSourceStop(impl_channels[i].sid);
+            impl_channels[i].startpaused = false;
+        }
+    }
+    return true;
 }
 
-int F_API OPENAL_Stream_PlayEx(int channel, FSOUND_STREAM *stream, FSOUND_DSPUNIT *dsp, signed char startpaused)
+AL_API signed char OPENAL_Stream_SetMode(OPENAL_STREAM *stream, unsigned int mode)
 {
-    return OPENAL_PlaySoundEx(channel, (FSOUND_SAMPLE *) stream, dsp, startpaused);
+    return OPENAL_Sample_SetMode((OPENAL_SAMPLE *) stream, mode);
 }
 
-signed char F_API OPENAL_Stream_Stop(FSOUND_STREAM *stream)
+AL_API void OPENAL_Update()
 {
-    if (!initialized) return FALSE;
-    for (int i = 0; i < num_channels; i++)
-    {
-        if (channels[i].sample == (FSOUND_SAMPLE *) stream)
-        {
-            alSourceStop(channels[i].sid);
-            channels[i].startpaused = false;
-        }
-    }
-    return TRUE;
+    if (!initialized)
+        return;
+    alcProcessContext(alcGetCurrentContext());
 }
 
-signed char F_API OPENAL_Stream_SetMode(FSOUND_STREAM *stream, unsigned int mode)
+AL_API signed char OPENAL_SetOutput(int outputtype)
 {
-    return OPENAL_Sample_SetMode((FSOUND_SAMPLE *) stream, mode);
+    return true;
 }
 
-void F_API OPENAL_Update()
-{
-    if (!initialized) return;
-    alcProcessContext(alcGetCurrentContext());
-}
+extern int channels[];
 
-signed char F_API OPENAL_SetOutput(int outputtype)
+extern "C" void PlaySoundEx(int chan, OPENAL_SAMPLE *sptr, OPENAL_DSPUNIT *dsp, signed char startpaused)
 {
-    return TRUE;
+    const OPENAL_SAMPLE * currSample = OPENAL_GetCurrentSample(channels[chan]);
+    if (currSample && currSample == samp[chan]) {
+        if (OPENAL_GetPaused(channels[chan])) {
+            OPENAL_StopSound(channels[chan]);
+            channels[chan] = OPENAL_FREE;
+        } else if (OPENAL_IsPlaying(channels[chan])) {
+            int loop_mode = OPENAL_GetLoopMode(channels[chan]);
+            if (loop_mode & OPENAL_LOOP_OFF) {
+                channels[chan] = OPENAL_FREE;
+            }
+        }
+    } else {
+        channels[chan] = OPENAL_FREE;
+    }
+
+    channels[chan] = OPENAL_PlaySoundEx(channels[chan], sptr, dsp, startpaused);
+    if (channels[chan] < 0) {
+        channels[chan] = OPENAL_PlaySoundEx(OPENAL_FREE, sptr, dsp, startpaused);
+    }
 }
 
-#endif
+extern "C" void PlayStreamEx(int chan, OPENAL_STREAM *sptr, OPENAL_DSPUNIT *dsp, signed char startpaused)
+{
+    const OPENAL_SAMPLE * currSample = OPENAL_GetCurrentSample(channels[chan]);
+    if (currSample && currSample == OPENAL_Stream_GetSample(sptr)) {
+        OPENAL_StopSound(channels[chan]);
+        OPENAL_Stream_Stop(sptr);
+    } else {
+        OPENAL_Stream_Stop(sptr);
+        channels[chan] = OPENAL_FREE;
+    }
 
+    channels[chan] = OPENAL_Stream_PlayEx(channels[chan], sptr, dsp, startpaused);
+    if (channels[chan] < 0) {
+        channels[chan] = OPENAL_Stream_PlayEx(OPENAL_FREE, sptr, dsp, startpaused);
+    }
+}