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#include "common.h"
#ifdef AUDIO_OAL
#include "channel.h"
#include "sampman.h"
#ifndef _WIN32
#include <float.h>
#endif
extern bool IsFXSupported();
ALuint alSources[MAXCHANNELS+MAX2DCHANNELS];
ALuint alFilters[MAXCHANNELS+MAX2DCHANNELS];
ALuint alBuffers[MAXCHANNELS+MAX2DCHANNELS];
bool bChannelsCreated = false;
int32 CChannel::channelsThatNeedService = 0;
void
CChannel::InitChannels()
{
alGenSources(MAXCHANNELS+MAX2DCHANNELS, alSources);
alGenBuffers(MAXCHANNELS+MAX2DCHANNELS, alBuffers);
if (IsFXSupported())
alGenFilters(MAXCHANNELS + MAX2DCHANNELS, alFilters);
bChannelsCreated = true;
}
void
CChannel::DestroyChannels()
{
if (bChannelsCreated)
{
alDeleteSources(MAXCHANNELS + MAX2DCHANNELS, alSources);
memset(alSources, 0, sizeof(alSources));
alDeleteBuffers(MAXCHANNELS + MAX2DCHANNELS, alBuffers);
memset(alBuffers, 0, sizeof(alBuffers));
if (IsFXSupported())
{
alDeleteFilters(MAXCHANNELS + MAX2DCHANNELS, alFilters);
memset(alFilters, 0, sizeof(alFilters));
}
bChannelsCreated = false;
}
}
CChannel::CChannel()
{
Data = nil;
DataSize = 0;
SetDefault();
}
void CChannel::SetDefault()
{
Pitch = 1.0f;
Gain = 1.0f;
Mix = 0.0f;
Position[0] = 0.0f; Position[1] = 0.0f; Position[2] = 0.0f;
Distances[0] = 0.0f; Distances[1] = FLT_MAX;
LoopCount = 1;
LastProcessedOffset = UINT32_MAX;
LoopPoints[0] = 0; LoopPoints[1] = -1;
Frequency = MAX_FREQ;
}
void CChannel::Reset()
{
// Here is safe because ctor don't call this
if (LoopCount > 1)
channelsThatNeedService--;
ClearBuffer();
SetDefault();
}
void CChannel::Init(uint32 _id, bool Is2D)
{
id = _id;
if ( HasSource() )
{
alSourcei(alSources[id], AL_SOURCE_RELATIVE, AL_TRUE);
if ( IsFXSupported() )
alSource3i(alSources[id], AL_AUXILIARY_SEND_FILTER, AL_EFFECTSLOT_NULL, 0, AL_FILTER_NULL);
if ( Is2D )
{
alSource3f(alSources[id], AL_POSITION, 0.0f, 0.0f, 0.0f);
alSourcef(alSources[id], AL_GAIN, 1.0f);
}
}
}
void CChannel::Term()
{
Stop();
if ( HasSource() )
{
if ( IsFXSupported() )
{
alSource3i(alSources[id], AL_AUXILIARY_SEND_FILTER, AL_EFFECTSLOT_NULL, 0, AL_FILTER_NULL);
}
}
}
void CChannel::Start()
{
if ( !HasSource() ) return;
if ( !Data ) return;
alBufferData(alBuffers[id], AL_FORMAT_MONO16, Data, DataSize, Frequency);
if ( LoopPoints[0] != 0 && LoopPoints[0] != -1 )
alBufferiv(alBuffers[id], AL_LOOP_POINTS_SOFT, LoopPoints);
alSourcei(alSources[id], AL_BUFFER, alBuffers[id]);
alSourcePlay(alSources[id]);
}
void CChannel::Stop()
{
if ( HasSource() )
alSourceStop(alSources[id]);
Reset();
}
bool CChannel::HasSource()
{
return alSources[id] != AL_NONE;
}
bool CChannel::IsUsed()
{
if ( HasSource() )
{
ALint sourceState;
alGetSourcei(alSources[id], AL_SOURCE_STATE, &sourceState);
return sourceState == AL_PLAYING;
}
return false;
}
void CChannel::SetPitch(float pitch)
{
if ( !HasSource() ) return;
alSourcef(alSources[id], AL_PITCH, pitch);
}
void CChannel::SetGain(float gain)
{
if ( !HasSource() ) return;
alSourcef(alSources[id], AL_GAIN, gain);
}
void CChannel::SetVolume(int32 vol)
{
SetGain(ALfloat(vol) / MAX_VOLUME);
}
void CChannel::SetSampleData(void *_data, size_t _DataSize, int32 freq)
{
Data = _data;
DataSize = _DataSize;
Frequency = freq;
}
void CChannel::SetCurrentFreq(uint32 freq)
{
SetPitch(ALfloat(freq) / Frequency);
}
void CChannel::SetLoopCount(int32 count)
{
if ( !HasSource() ) return;
// 0: loop indefinitely, 1: play one time, 2: play two times etc...
// only > 1 needs manual processing
if (LoopCount > 1 && count < 2)
channelsThatNeedService--;
else if (LoopCount < 2 && count > 1)
channelsThatNeedService++;
alSourcei(alSources[id], AL_LOOPING, count == 1 ? AL_FALSE : AL_TRUE);
LoopCount = count;
}
bool CChannel::Update()
{
if (!HasSource()) return false;
if (LoopCount < 2) return false;
ALint state;
alGetSourcei(alSources[id], AL_SOURCE_STATE, &state);
if (state == AL_STOPPED) {
debug("Looping channels(%d in this case) shouldn't report AL_STOPPED, but nvm\n", id);
SetLoopCount(1);
return true;
}
assert(channelsThatNeedService > 0 && "Ref counting is broken");
ALint offset;
alGetSourcei(alSources[id], AL_SAMPLE_OFFSET, &offset);
// Rewound
if (offset < LastProcessedOffset) {
LoopCount--;
if (LoopCount == 1) {
// Playing last tune...
channelsThatNeedService--;
alSourcei(alSources[id], AL_LOOPING, AL_FALSE);
}
}
LastProcessedOffset = offset;
return true;
}
void CChannel::SetLoopPoints(ALint start, ALint end)
{
LoopPoints[0] = start;
LoopPoints[1] = end;
}
void CChannel::SetPosition(float x, float y, float z)
{
if ( !HasSource() ) return;
alSource3f(alSources[id], AL_POSITION, x, y, z);
}
void CChannel::SetDistances(float max, float min)
{
if ( !HasSource() ) return;
alSourcef (alSources[id], AL_MAX_DISTANCE, max);
alSourcef (alSources[id], AL_REFERENCE_DISTANCE, min);
alSourcef (alSources[id], AL_MAX_GAIN, 1.0f);
alSourcef (alSources[id], AL_ROLLOFF_FACTOR, 1.0f);
}
void CChannel::SetPan(int32 pan)
{
SetPosition((pan-63)/64.0f, 0.0f, Sqrt(1.0f-SQR((pan-63)/64.0f)));
}
void CChannel::ClearBuffer()
{
if ( !HasSource() ) return;
alSourcei(alSources[id], AL_LOOPING, AL_FALSE);
alSourcei(alSources[id], AL_BUFFER, AL_NONE);
Data = nil;
DataSize = 0;
}
void CChannel::SetReverbMix(ALuint slot, float mix)
{
if ( !IsFXSupported() ) return;
if ( !HasSource() ) return;
if ( alFilters[id] == AL_FILTER_NULL ) return;
Mix = mix;
EAX3_SetReverbMix(alFilters[id], mix);
alSource3i(alSources[id], AL_AUXILIARY_SEND_FILTER, slot, 0, alFilters[id]);
}
void CChannel::UpdateReverb(ALuint slot)
{
if ( !IsFXSupported() ) return;
if ( !HasSource() ) return;
if ( alFilters[id] == AL_FILTER_NULL ) return;
EAX3_SetReverbMix(alFilters[id], Mix);
alSource3i(alSources[id], AL_AUXILIARY_SEND_FILTER, slot, 0, alFilters[id]);
}
#endif
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