cFilter.cpp

// Copyright (c) 2008-2010 Raynaldo (Wildicv) Rivera, Joshua (Dark_Kilauea) Jones
// This file is part of the "cAudio Engine"
// For conditions of distribution and use, see copyright notice in cAudio.h

#include "../Headers/cFilter.h"
#include "../Headers/cLogger.h"
#include "../Headers/cUtils.h"

#ifdef CAUDIO_EFX_ENABLED

namespace cAudio
{
        cFilter::cFilter(cEFXFunctions* oALFunctions) : EFX(oALFunctions), Type(EFT_NULL), 
                Volume(1.0f), LowFreqVolume(1.0f), HighFreqVolume(1.0f), LastUpdated(0),
                Valid(false), Filter(0)
        {
                cAudioMutexBasicLock lock(Mutex);
                if(EFX)
                        Valid = EFX->Supported;

                if(Valid)
                {
                        cAudioMutexBasicLock lock(EFX->Mutex);
                        EFX->alGenFilters(1, &Filter);
                        Valid = !CheckError();
                        if(!Valid)
                                Filter = 0;
                }
        }

        cFilter::~cFilter()
        {
                cAudioMutexBasicLock lock(Mutex);
                if(Filter && EFX && EFX->Supported)
                {
                        cAudioMutexBasicLock lock(EFX->Mutex);
                        EFX->alDeleteFilters(1, &Filter);
                }
        }

        const FilterTypes& cFilter::getType() const
        {
                return Type;
        }

        void cFilter::setType(const FilterTypes& type)
        {
                cAudioMutexBasicLock lock(Mutex);
                Type = type;
                UpdateFilter();
        }

        float cFilter::getVolume() const
        {
                return Volume;
        }

        void cFilter::setVolume(const float& volume)
        {
                cAudioMutexBasicLock lock(Mutex);
                Volume = volume;
                UpdateFilter();
        }

        float cFilter::getLowFrequencyVolume() const
        {
                return LowFreqVolume;
        }

        void cFilter::setLowFrequencyVolume(const float& volumeLF)
        {
                cAudioMutexBasicLock lock(Mutex);
                LowFreqVolume = volumeLF;
                UpdateFilter();
        }

        float cFilter::getHighFrequencyVolume() const
        {
                return HighFreqVolume;
        }

        void cFilter::setHighFrequencyVolume(const float& volumeHF)
        {
                cAudioMutexBasicLock lock(Mutex);
                HighFreqVolume = volumeHF;
                UpdateFilter();
        }

        unsigned int cFilter::getLastUpdated() const
        {
                return LastUpdated;
        }

        bool cFilter::isValid() const
        {
                return Valid;
        }

        ALuint cFilter::getOpenALFilter() const
        {
                return Filter;
        }

        bool cFilter::UpdateFilter()
        {
                ++LastUpdated;

                ALenum alFilterType = ConvertFilterEnum(Type);

                if(Filter && EFX && EFX->Supported)
                {
                        cAudioMutexBasicLock lock(EFX->Mutex);
                        EFX->alFilteri(Filter, AL_FILTER_TYPE, alFilterType);
                        Valid = !CheckError();
                        if(!Valid)
                                return false;

                        if(Type == EFT_LOWPASS)
                        {
                                EFX->alFilterf(Filter, AL_LOWPASS_GAIN, Volume);
                                EFX->alFilterf(Filter, AL_LOWPASS_GAINHF, HighFreqVolume);
                                Valid = !CheckError();
                                return Valid;
                        }
                        else if(Type == EFT_HIGHPASS)
                        {
                                EFX->alFilterf(Filter, AL_HIGHPASS_GAIN, Volume);
                                EFX->alFilterf(Filter, AL_HIGHPASS_GAINLF, LowFreqVolume);
                                Valid = !CheckError();
                                return Valid;
                        }
                        else if(Type == EFT_BANDPASS)
                        {
                                EFX->alFilterf(Filter, AL_BANDPASS_GAIN, Volume);
                                EFX->alFilterf(Filter, AL_BANDPASS_GAINLF, LowFreqVolume);
                                EFX->alFilterf(Filter, AL_BANDPASS_GAINHF, HighFreqVolume);
                                Valid = !CheckError();
                                return Valid;
                        }
                        else
                        {
                                return true;
                        }
                }
                return false;
        }

        bool cFilter::CheckError()
        {
                int error = alGetError();
                const char* errorString;

        if (error != AL_NO_ERROR)
        {
                        errorString = alGetString(error);
                        if(error == AL_OUT_OF_MEMORY)
                                getLogger()->logCritical("Audio Filter", "OpenAL Error: %s.", errorString);
                        else
                                getLogger()->logError("Audio Filter", "OpenAL Error: %s.", errorString);
                        return true;
        }
                return false;
        }

        ALenum cFilter::ConvertFilterEnum(FilterTypes type)
        {
                switch(type)
                {
                case EFT_NULL:
                        return AL_FILTER_NULL;
                case EFT_LOWPASS:
                        return AL_FILTER_LOWPASS;
                case EFT_HIGHPASS:
                        return AL_FILTER_HIGHPASS;
                case EFT_BANDPASS:
                        return AL_FILTER_BANDPASS;
                default:
                        return AL_FILTER_NULL;
                };
        }
};

#endif