void aluInitMixer(void)
{
ALuint i;
for(i = 0;i < FRACTIONONE;i++)
{
ALfloat mu = (ALfloat)i / FRACTIONONE;
ResampleCoeffs[i][0] = lanc2(mu - -1.0f);
ResampleCoeffs[i][1] = lanc2(mu - 0.0f);
ResampleCoeffs[i][2] = lanc2(mu - 1.0f);
ResampleCoeffs[i][3] = lanc2(mu - 2.0f);
}
MixHrtfSamples = SelectHrtfMixer();
MixSamples = SelectMixer();
ResampleSamples = SelectResampler(DefaultResampler);
}
ALvoid CalcNonAttnSourceParams(ALsource *ALSource, const ALCcontext *ALContext)
{
static const ALfloat angles_Mono[1] = { 0.0f };
static const ALfloat angles_Stereo[2] = { -30.0f, 30.0f };
static const ALfloat angles_Rear[2] = { -150.0f, 150.0f };
static const ALfloat angles_Quad[4] = { -45.0f, 45.0f, -135.0f, 135.0f };
static const ALfloat angles_X51[6] = { -30.0f, 30.0f, 0.0f, 0.0f,
-110.0f, 110.0f };
static const ALfloat angles_X61[7] = { -30.0f, 30.0f, 0.0f, 0.0f,
180.0f, -90.0f, 90.0f };
static const ALfloat angles_X71[8] = { -30.0f, 30.0f, 0.0f, 0.0f,
-110.0f, 110.0f, -90.0f, 90.0f };
static const enum Channel chans_Mono[1] = { FRONT_CENTER };
static const enum Channel chans_Stereo[2] = { FRONT_LEFT, FRONT_RIGHT };
static const enum Channel chans_Rear[2] = { BACK_LEFT, BACK_RIGHT };
static const enum Channel chans_Quad[4] = { FRONT_LEFT, FRONT_RIGHT,
BACK_LEFT, BACK_RIGHT };
static const enum Channel chans_X51[6] = { FRONT_LEFT, FRONT_RIGHT,
FRONT_CENTER, LFE,
BACK_LEFT, BACK_RIGHT };
static const enum Channel chans_X61[7] = { FRONT_LEFT, FRONT_RIGHT,
FRONT_CENTER, LFE, BACK_CENTER,
SIDE_LEFT, SIDE_RIGHT };
static const enum Channel chans_X71[8] = { FRONT_LEFT, FRONT_RIGHT,
FRONT_CENTER, LFE,
BACK_LEFT, BACK_RIGHT,
SIDE_LEFT, SIDE_RIGHT };
ALCdevice *Device = ALContext->Device;
ALfloat SourceVolume,ListenerGain,MinVolume,MaxVolume;
ALbufferlistitem *BufferListItem;
enum DevFmtChannels DevChans;
enum FmtChannels Channels;
ALfloat (*SrcMatrix)[MAXCHANNELS];
ALfloat DryGain, DryGainHF;
ALfloat WetGain[MAX_SENDS];
ALfloat WetGainHF[MAX_SENDS];
ALint NumSends, Frequency;
const ALfloat *SpeakerGain;
const ALfloat *angles = NULL;
const enum Channel *chans = NULL;
enum Resampler Resampler;
ALint num_channels = 0;
ALboolean VirtualChannels;
ALfloat Pitch;
ALfloat cw;
ALuint pos;
ALint i, c;
/* Get device properties */
DevChans = ALContext->Device->FmtChans;
NumSends = ALContext->Device->NumAuxSends;
Frequency = ALContext->Device->Frequency;
/* Get listener properties */
ListenerGain = ALContext->Listener.Gain;
/* Get source properties */
SourceVolume = ALSource->flGain;
MinVolume = ALSource->flMinGain;
MaxVolume = ALSource->flMaxGain;
Pitch = ALSource->flPitch;
Resampler = ALSource->Resampler;
VirtualChannels = ALSource->VirtualChannels;
/* Calculate the stepping value */
Channels = FmtMono;
BufferListItem = ALSource->queue;
while(BufferListItem != NULL)
{
ALbuffer *ALBuffer;
if((ALBuffer=BufferListItem->buffer) != NULL)
{
ALint maxstep = STACK_DATA_SIZE / ALSource->NumChannels /
ALSource->SampleSize;
maxstep -= ResamplerPadding[Resampler] +
ResamplerPrePadding[Resampler] + 1;
maxstep = mini(maxstep, INT_MAX>>FRACTIONBITS);
Pitch = Pitch * ALBuffer->Frequency / Frequency;
if(Pitch > (ALfloat)maxstep)
ALSource->Params.Step = maxstep<<FRACTIONBITS;
else
{
ALSource->Params.Step = Pitch*FRACTIONONE;
if(ALSource->Params.Step == 0)
ALSource->Params.Step = 1;
}
Channels = ALBuffer->FmtChannels;
if(ALSource->VirtualChannels && (Device->Flags&DEVICE_USE_HRTF))
ALSource->Params.DoMix = SelectHrtfMixer(ALBuffer,
(ALSource->Params.Step==FRACTIONONE) ? POINT_RESAMPLER :
Resampler);
else
ALSource->Params.DoMix = SelectMixer(ALBuffer,
(ALSource->Params.Step==FRACTIONONE) ? POINT_RESAMPLER :
Resampler);
break;
}
BufferListItem = BufferListItem->next;
}