Add support for ALC_EXT_DEDICATED

1 files changed, 131 insertions, 0 deletions

diff --git a/Alc/alcDedicated.c b/Alc/alcDedicated.c
new file mode 100644
index 00000000..4ffc6534
--- /dev/null
+++ b/Alc/alcDedicated.c
@@ -0,0 +1,131 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2011 by Chris Robinson.
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ *  Boston, MA  02111-1307, USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+
+#include "alMain.h"
+#include "alFilter.h"
+#include "alAuxEffectSlot.h"
+#include "alError.h"
+#include "alu.h"
+
+
+typedef struct ALdedicatedState {
+    // Must be first in all effects!
+    ALeffectState state;
+
+    ALfloat gains[MAXCHANNELS];
+} ALdedicatedState;
+
+
+static ALvoid DedicatedDestroy(ALeffectState *effect)
+{
+    ALdedicatedState *state = (ALdedicatedState*)effect;
+    free(state);
+}
+
+static ALboolean DedicatedDeviceUpdate(ALeffectState *effect, ALCdevice *Device)
+{
+    (void)effect;
+    (void)Device;
+    return AL_TRUE;
+}
+
+static ALvoid DedicatedDLGUpdate(ALeffectState *effect, ALCcontext *Context, const ALeffect *Effect)
+{
+    ALdedicatedState *state = (ALdedicatedState*)effect;
+    ALCdevice *device = Context->Device;
+    const ALfloat *SpeakerGain;
+    ALint pos;
+    ALsizei s;
+
+    pos = aluCart2LUTpos(-1.0f, 0.0f);
+    SpeakerGain = &device->PanningLUT[MAXCHANNELS * pos];
+
+    for(s = 0;s < MAXCHANNELS;s++)
+        state->gains[s] = SpeakerGain[s] * Effect->Dedicated.Gain;
+}
+
+static ALvoid DedicatedLFEUpdate(ALeffectState *effect, ALCcontext *Context, const ALeffect *Effect)
+{
+    ALdedicatedState *state = (ALdedicatedState*)effect;
+    ALsizei s;
+    (void)Context;
+
+    for(s = 0;s < MAXCHANNELS;s++)
+        state->gains[s] = 0.0f;
+    state->gains[LFE] = Effect->Dedicated.Gain;
+}
+
+static ALvoid DedicatedProcess(ALeffectState *effect, const ALeffectslot *Slot, ALuint SamplesToDo, const ALfloat *SamplesIn, ALfloat (*SamplesOut)[MAXCHANNELS])
+{
+    ALdedicatedState *state = (ALdedicatedState*)effect;
+    const ALfloat *gains = state->gains;
+    ALuint i;
+
+    for(i = 0;i < SamplesToDo;i++)
+    {
+        ALsizei s;
+        for(s = 0;s < MAXCHANNELS;s++)
+            SamplesOut[i][s] = SamplesIn[i] * gains[s] * Slot->Gain;
+    }
+}
+
+ALeffectState *DedicatedDLGCreate(void)
+{
+    ALdedicatedState *state;
+    ALsizei s;
+
+    state = malloc(sizeof(*state));
+    if(!state)
+        return NULL;
+
+    state->state.Destroy = DedicatedDestroy;
+    state->state.DeviceUpdate = DedicatedDeviceUpdate;
+    state->state.Update = DedicatedDLGUpdate;
+    state->state.Process = DedicatedProcess;
+
+    for(s = 0;s < MAXCHANNELS;s++)
+        state->gains[s] = 0.0f;
+
+    return &state->state;
+}
+
+ALeffectState *DedicatedLFECreate(void)
+{
+    ALdedicatedState *state;
+    ALsizei s;
+
+    state = malloc(sizeof(*state));
+    if(!state)
+        return NULL;
+
+    state->state.Destroy = DedicatedDestroy;
+    state->state.DeviceUpdate = DedicatedDeviceUpdate;
+    state->state.Update = DedicatedLFEUpdate;
+    state->state.Process = DedicatedProcess;
+
+    for(s = 0;s < MAXCHANNELS;s++)
+        state->gains[s] = 0.0f;
+
+    return &state->state;
+}