love2d.megasource/libs/openal-soft/Alc/effects/dedicated.c

/**
 * 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.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 {
    DERIVE_FROM_TYPE(ALeffectState);

    ALfloat gains[MAX_OUTPUT_CHANNELS];
} ALdedicatedState;


static ALvoid ALdedicatedState_Destruct(ALdedicatedState *UNUSED(state))
{
}

static ALboolean ALdedicatedState_deviceUpdate(ALdedicatedState *UNUSED(state), ALCdevice *UNUSED(device))
{
    return AL_TRUE;
}

static ALvoid ALdedicatedState_update(ALdedicatedState *state, ALCdevice *device, const ALeffectslot *Slot)
{
    ALfloat Gain;
    ALuint i;

    for(i = 0;i < MAX_OUTPUT_CHANNELS;i++)
        state->gains[i] = 0.0f;

    Gain = Slot->Gain * Slot->EffectProps.Dedicated.Gain;
    if(Slot->EffectType == AL_EFFECT_DEDICATED_LOW_FREQUENCY_EFFECT)
    {
        int idx;
        if((idx=GetChannelIdxByName(device, LFE)) != -1)
            state->gains[idx] = Gain;
    }
    else if(Slot->EffectType == AL_EFFECT_DEDICATED_DIALOGUE)
    {
        int idx;
        /* Dialog goes to the front-center speaker if it exists, otherwise it
         * plays from the front-center location. */
        if((idx=GetChannelIdxByName(device, FrontCenter)) != -1)
            state->gains[idx] = Gain;
        else
        {
            static const ALfloat front_dir[3] = { 0.0f, 0.0f, -1.0f };
            ComputeDirectionalGains(device, front_dir, Gain, state->gains);
        }
    }
}

static ALvoid ALdedicatedState_process(ALdedicatedState *state, ALuint SamplesToDo, const ALfloat *restrict SamplesIn, ALfloat (*restrict SamplesOut)[BUFFERSIZE], ALuint NumChannels)
{
    const ALfloat *gains = state->gains;
    ALuint i, c;

    for(c = 0;c < NumChannels;c++)
    {
        if(!(fabsf(gains[c]) > GAIN_SILENCE_THRESHOLD))
            continue;

        for(i = 0;i < SamplesToDo;i++)
            SamplesOut[c][i] = SamplesIn[i] * gains[c];
    }
}

DECLARE_DEFAULT_ALLOCATORS(ALdedicatedState)

DEFINE_ALEFFECTSTATE_VTABLE(ALdedicatedState);


typedef struct ALdedicatedStateFactory {
    DERIVE_FROM_TYPE(ALeffectStateFactory);
} ALdedicatedStateFactory;

ALeffectState *ALdedicatedStateFactory_create(ALdedicatedStateFactory *UNUSED(factory))
{
    ALdedicatedState *state;
    ALsizei s;

    state = ALdedicatedState_New(sizeof(*state));
    if(!state) return NULL;
    SET_VTABLE2(ALdedicatedState, ALeffectState, state);

    for(s = 0;s < MAX_OUTPUT_CHANNELS;s++)
        state->gains[s] = 0.0f;

    return STATIC_CAST(ALeffectState, state);
}

DEFINE_ALEFFECTSTATEFACTORY_VTABLE(ALdedicatedStateFactory);


ALeffectStateFactory *ALdedicatedStateFactory_getFactory(void)
{
    static ALdedicatedStateFactory DedicatedFactory = { { GET_VTABLE2(ALdedicatedStateFactory, ALeffectStateFactory) } };

    return STATIC_CAST(ALeffectStateFactory, &DedicatedFactory);
}


void ALdedicated_setParami(ALeffect *UNUSED(effect), ALCcontext *context, ALenum UNUSED(param), ALint UNUSED(val))
{ SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM); }
void ALdedicated_setParamiv(ALeffect *effect, ALCcontext *context, ALenum param, const ALint *vals)
{
    ALdedicated_setParami(effect, context, param, vals[0]);
}
void ALdedicated_setParamf(ALeffect *effect, ALCcontext *context, ALenum param, ALfloat val)
{
    ALeffectProps *props = &effect->Props;
    switch(param)
    {
        case AL_DEDICATED_GAIN:
            if(!(val >= 0.0f && isfinite(val)))
                SET_ERROR_AND_RETURN(context, AL_INVALID_VALUE);
            props->Dedicated.Gain = val;
            break;

        default:
            SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM);
    }
}
void ALdedicated_setParamfv(ALeffect *effect, ALCcontext *context, ALenum param, const ALfloat *vals)
{
    ALdedicated_setParamf(effect, context, param, vals[0]);
}

void ALdedicated_getParami(const ALeffect *UNUSED(effect), ALCcontext *context, ALenum UNUSED(param), ALint *UNUSED(val))
{ SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM); }
void ALdedicated_getParamiv(const ALeffect *effect, ALCcontext *context, ALenum param, ALint *vals)
{
    ALdedicated_getParami(effect, context, param, vals);
}
void ALdedicated_getParamf(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *val)
{
    const ALeffectProps *props = &effect->Props;
    switch(param)
    {
        case AL_DEDICATED_GAIN:
            *val = props->Dedicated.Gain;
            break;

        default:
            SET_ERROR_AND_RETURN(context, AL_INVALID_ENUM);
    }
}
void ALdedicated_getParamfv(const ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *vals)
{
    ALdedicated_getParamf(effect, context, param, vals);
}

DEFINE_ALEFFECT_VTABLE(ALdedicated);