rlm@0: /**
rlm@0:  * OpenAL cross platform audio library
rlm@0:  * Copyright (C) 2011 by Chris Robinson.
rlm@0:  * This library is free software; you can redistribute it and/or
rlm@0:  *  modify it under the terms of the GNU Library General Public
rlm@0:  *  License as published by the Free Software Foundation; either
rlm@0:  *  version 2 of the License, or (at your option) any later version.
rlm@0:  *
rlm@0:  * This library is distributed in the hope that it will be useful,
rlm@0:  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
rlm@0:  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
rlm@0:  *  Library General Public License for more details.
rlm@0:  *
rlm@0:  * You should have received a copy of the GNU Library General Public
rlm@0:  *  License along with this library; if not, write to the
rlm@0:  *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
rlm@0:  *  Boston, MA  02111-1307, USA.
rlm@0:  * Or go to http://www.gnu.org/copyleft/lgpl.html
rlm@0:  */
rlm@0: 
rlm@0: #include "config.h"
rlm@0: 
rlm@0: #include <stdlib.h>
rlm@0: 
rlm@0: #include "alMain.h"
rlm@0: #include "alFilter.h"
rlm@0: #include "alAuxEffectSlot.h"
rlm@0: #include "alError.h"
rlm@0: #include "alu.h"
rlm@0: 
rlm@0: 
rlm@0: typedef struct ALdedicatedState {
rlm@0:     // Must be first in all effects!
rlm@0:     ALeffectState state;
rlm@0: 
rlm@0:     ALfloat gains[MAXCHANNELS];
rlm@0: } ALdedicatedState;
rlm@0: 
rlm@0: 
rlm@0: static ALvoid DedicatedDestroy(ALeffectState *effect)
rlm@0: {
rlm@0:     ALdedicatedState *state = (ALdedicatedState*)effect;
rlm@0:     free(state);
rlm@0: }
rlm@0: 
rlm@0: static ALboolean DedicatedDeviceUpdate(ALeffectState *effect, ALCdevice *Device)
rlm@0: {
rlm@0:     (void)effect;
rlm@0:     (void)Device;
rlm@0:     return AL_TRUE;
rlm@0: }
rlm@0: 
rlm@0: static ALvoid DedicatedDLGUpdate(ALeffectState *effect, ALCcontext *Context, const ALeffectslot *Slot)
rlm@0: {
rlm@0:     ALdedicatedState *state = (ALdedicatedState*)effect;
rlm@0:     ALCdevice *device = Context->Device;
rlm@0:     const ALfloat *SpeakerGain;
rlm@0:     ALfloat Gain;
rlm@0:     ALint pos;
rlm@0:     ALsizei s;
rlm@0: 
rlm@0:     pos = aluCart2LUTpos(1.0f, 0.0f);
rlm@0:     SpeakerGain = device->PanningLUT[pos];
rlm@0: 
rlm@0:     Gain = Slot->Gain * Slot->effect.Params.Dedicated.Gain;
rlm@0:     for(s = 0;s < MAXCHANNELS;s++)
rlm@0:         state->gains[s] = SpeakerGain[s] * Gain;
rlm@0: }
rlm@0: 
rlm@0: static ALvoid DedicatedLFEUpdate(ALeffectState *effect, ALCcontext *Context, const ALeffectslot *Slot)
rlm@0: {
rlm@0:     ALdedicatedState *state = (ALdedicatedState*)effect;
rlm@0:     ALfloat Gain;
rlm@0:     ALsizei s;
rlm@0:     (void)Context;
rlm@0: 
rlm@0:     Gain = Slot->Gain * Slot->effect.Params.Dedicated.Gain;
rlm@0:     for(s = 0;s < MAXCHANNELS;s++)
rlm@0:         state->gains[s] = 0.0f;
rlm@0:     state->gains[LFE] = Gain;
rlm@0: }
rlm@0: 
rlm@0: static ALvoid DedicatedProcess(ALeffectState *effect, const ALeffectslot *Slot, ALuint SamplesToDo, const ALfloat *SamplesIn, ALfloat (*SamplesOut)[MAXCHANNELS])
rlm@0: {
rlm@0:     ALdedicatedState *state = (ALdedicatedState*)effect;
rlm@0:     const ALfloat *gains = state->gains;
rlm@0:     ALuint i, s;
rlm@0:     (void)Slot;
rlm@0: 
rlm@0:     for(i = 0;i < SamplesToDo;i++)
rlm@0:     {
rlm@0:         ALfloat sample;
rlm@0: 
rlm@0:         sample = SamplesIn[i];
rlm@0:         for(s = 0;s < MAXCHANNELS;s++)
rlm@0:             SamplesOut[i][s] = sample * gains[s];
rlm@0:     }
rlm@0: }
rlm@0: 
rlm@0: ALeffectState *DedicatedDLGCreate(void)
rlm@0: {
rlm@0:     ALdedicatedState *state;
rlm@0:     ALsizei s;
rlm@0: 
rlm@0:     state = malloc(sizeof(*state));
rlm@0:     if(!state)
rlm@0:         return NULL;
rlm@0: 
rlm@0:     state->state.Destroy = DedicatedDestroy;
rlm@0:     state->state.DeviceUpdate = DedicatedDeviceUpdate;
rlm@0:     state->state.Update = DedicatedDLGUpdate;
rlm@0:     state->state.Process = DedicatedProcess;
rlm@0: 
rlm@0:     for(s = 0;s < MAXCHANNELS;s++)
rlm@0:         state->gains[s] = 0.0f;
rlm@0: 
rlm@0:     return &state->state;
rlm@0: }
rlm@0: 
rlm@0: ALeffectState *DedicatedLFECreate(void)
rlm@0: {
rlm@0:     ALdedicatedState *state;
rlm@0:     ALsizei s;
rlm@0: 
rlm@0:     state = malloc(sizeof(*state));
rlm@0:     if(!state)
rlm@0:         return NULL;
rlm@0: 
rlm@0:     state->state.Destroy = DedicatedDestroy;
rlm@0:     state->state.DeviceUpdate = DedicatedDeviceUpdate;
rlm@0:     state->state.Update = DedicatedLFEUpdate;
rlm@0:     state->state.Process = DedicatedProcess;
rlm@0: 
rlm@0:     for(s = 0;s < MAXCHANNELS;s++)
rlm@0:         state->gains[s] = 0.0f;
rlm@0: 
rlm@0:     return &state->state;
rlm@0: }