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-rw-r--r--Alc/alcFlanger.c129
1 files changed, 60 insertions, 69 deletions
diff --git a/Alc/alcFlanger.c b/Alc/alcFlanger.c
index 5b643a46..2d3c35b0 100644
--- a/Alc/alcFlanger.c
+++ b/Alc/alcFlanger.c
@@ -77,34 +77,28 @@ static ALboolean FlangerDeviceUpdate(ALeffectState *effect, ALCdevice *Device)
maxlen = fastf2u(AL_FLANGER_MAX_DELAY * 3.0f * Device->Frequency) + 1;
maxlen = NextPowerOf2(maxlen);
- if (maxlen != state->BufferLength)
+ if(maxlen != state->BufferLength)
{
void *temp;
temp = realloc(state->SampleBufferLeft, maxlen * sizeof(ALfloat));
- if (!temp)
- {
- return AL_FALSE;
- }
+ if(!temp) return AL_FALSE;
state->SampleBufferLeft = temp;
temp = realloc(state->SampleBufferRight, maxlen * sizeof(ALfloat));
- if (!temp)
- {
- return AL_FALSE;
- }
+ if(!temp) return AL_FALSE;
state->SampleBufferRight = temp;
state->BufferLength = maxlen;
}
- for (it = 0; it < state->BufferLength; it++)
+ for(it = 0;it < state->BufferLength;it++)
{
state->SampleBufferLeft[it] = 0.0f;
state->SampleBufferRight[it] = 0.0f;
}
- state->frequency=(ALfloat)Device->Frequency;
+ state->frequency = (ALfloat)Device->Frequency;
return AL_TRUE;
}
@@ -114,7 +108,7 @@ static ALvoid FlangerUpdate(ALeffectState *effect, ALCdevice *Device, const ALef
ALflangerState *state = GET_PARENT_TYPE(ALflangerState, ALeffectState, effect);
ALuint it;
- for (it = 0; it < MaxChannels; it++)
+ for(it = 0;it < MaxChannels;it++)
{
state->Gain[0][it] = 0.0f;
state->Gain[1][it] = 0.0f;
@@ -126,49 +120,72 @@ static ALvoid FlangerUpdate(ALeffectState *effect, ALCdevice *Device, const ALef
state->depth = Slot->effect.Flanger.Depth;
state->feedback = Slot->effect.Flanger.Feedback;
state->delay = Slot->effect.Flanger.Delay;
- state->frequency=(ALfloat)Device->Frequency;
+ state->frequency = (ALfloat)Device->Frequency;
/* Gains for left and right sides */
ComputeAngleGains(Device, atan2f(-1.0f, 0.0f), 0.0f, Slot->Gain, state->Gain[0]);
ComputeAngleGains(Device, atan2f(+1.0f, 0.0f), 0.0f, Slot->Gain, state->Gain[1]);
/* Calculate LFO coefficient */
- switch (state->waveform)
+ switch(state->waveform)
{
case AL_FLANGER_WAVEFORM_TRIANGLE:
- if (state->rate == 0.0f)
- {
+ if(state->rate == 0.0f)
state->lfo_coeff = 0.0f;
- }
else
- {
- state->lfo_coeff = 1.0f / ((ALfloat)Device->Frequency / state->rate);
- }
+ state->lfo_coeff = 1.0f / (state->frequency / state->rate);
break;
case AL_FLANGER_WAVEFORM_SINUSOID:
if (state->rate == 0.0f)
- {
state->lfo_coeff = 0.0f;
- }
else
- {
- state->lfo_coeff = F_PI * 2.0f / ((ALfloat)Device->Frequency / state->rate);
- }
+ state->lfo_coeff = F_PI * 2.0f / (state->frequency / state->rate);
break;
}
/* Calculate lfo phase displacement */
- if ((state->phase == 0) || (state->rate == 0.0f))
- {
+ if(state->phase == 0 || state->rate == 0.0f)
state->lfo_disp = 0;
- }
else
{
- state->lfo_disp = (ALint) ((ALfloat)Device->Frequency /
- state->rate / (360.0f / (ALfloat)state->phase));
+ state->lfo_disp = (ALint)(state->frequency / state->rate /
+ (360.0f / (ALfloat)state->phase));
}
}
+static __inline void CalcTriangleDelays(ALint *delay_left, ALint *delay_right, ALint offset, const ALflangerState *state)
+{
+ ALfloat lfo_value;
+
+ lfo_value = 2.0f - fabsf(2.0f - fmodf(state->lfo_coeff * offset * 4.0f, 4.0f));
+ lfo_value *= state->depth * state->delay;
+ lfo_value += state->delay;
+ *delay_left = (ALint)(lfo_value * state->frequency);
+
+ lfo_value = 2.0f - fabsf(2.0f - fmodf(state->lfo_coeff *
+ (offset+state->lfo_disp) * 4.0f,
+ 4.0f));
+ lfo_value *= state->depth * state->delay;
+ lfo_value += state->delay;
+ *delay_right = (ALint)(lfo_value * state->frequency);
+}
+
+static __inline void CalcSinusoidDelays(ALint *delay_left, ALint *delay_right, ALint offset, const ALflangerState *state)
+{
+ ALfloat lfo_value;
+
+ lfo_value = 1.0f + sinf(fmodf(state->lfo_coeff * offset, 2.0f*F_PI));
+ lfo_value *= state->depth * state->delay;
+ lfo_value += state->delay;
+ *delay_left = (ALint)(lfo_value * state->frequency);
+
+ lfo_value = 1.0f + sinf(fmodf(state->lfo_coeff * (offset+state->lfo_disp),
+ 2.0f*F_PI));
+ lfo_value *= state->depth * state->delay;
+ lfo_value += state->delay;
+ *delay_right = (ALint)(lfo_value * state->frequency);
+}
+
static ALvoid FlangerProcess(ALeffectState *effect, ALuint SamplesToDo, const ALfloat *RESTRICT SamplesIn, ALfloat (*RESTRICT SamplesOut)[BUFFERSIZE])
{
ALflangerState *state = GET_PARENT_TYPE(ALflangerState, ALeffectState, effect);
@@ -176,75 +193,49 @@ static ALvoid FlangerProcess(ALeffectState *effect, ALuint SamplesToDo, const AL
ALuint it;
ALuint kt;
ALint offset;
- ALfloat lfo_value_left = 0.0f;
- ALfloat lfo_value_right = 0.0f;
ALint delay_left = 0;
ALint delay_right = 0;
ALfloat smp;
- offset=state->offset;
+ offset = state->offset;
- switch (state->waveform)
+ switch(state->waveform)
{
case AL_FLANGER_WAVEFORM_TRIANGLE:
- for (it = 0; it < SamplesToDo; it++, offset++)
+ for(it = 0;it < SamplesToDo;it++,offset++)
{
- lfo_value_left = 2.0f - fabsf(2.0f - fmodf(state->lfo_coeff *
- offset * 4.0f, 4.0f));
- lfo_value_left *= state->depth * state->delay;
- lfo_value_left += state->delay;
- delay_left = (ALint)(lfo_value_left * state->frequency);
- lfo_value_right = 2.0f - fabsf(2.0f - fmodf(state->lfo_coeff *
- (offset + state->lfo_disp) * 4.0f, 4.0f));
- lfo_value_right *= state->depth * state->delay;
- lfo_value_right += state->delay;
- delay_right = (ALint)(lfo_value_right * state->frequency);
+ CalcTriangleDelays(&delay_left, &delay_right, offset, state);
smp = state->SampleBufferLeft[(offset-delay_left) & mask];
- for (kt = 0; kt < MaxChannels; kt++)
- {
+ for(kt = 0;kt < MaxChannels;kt++)
SamplesOut[kt][it] += smp * state->Gain[0][kt];
- }
state->SampleBufferLeft[offset & mask] = (smp + SamplesIn[it]) * state->feedback;
+
smp = state->SampleBufferRight[(offset-delay_right) & mask];
- for (kt = 0; kt < MaxChannels; kt++)
- {
+ for(kt = 0;kt < MaxChannels;kt++)
SamplesOut[kt][it] += smp * state->Gain[1][kt];
- }
state->SampleBufferRight[offset & mask] = (smp + SamplesIn[it]) * state->feedback;
}
break;
case AL_FLANGER_WAVEFORM_SINUSOID:
- for (it = 0; it < SamplesToDo; it++, offset++)
+ for(it = 0;it < SamplesToDo;it++,offset++)
{
- lfo_value_left = 1.0f + sinf(fmodf(state->lfo_coeff *
- offset, 2 * F_PI));
- lfo_value_left *= state->depth * state->delay;
- lfo_value_left += state->delay;
- delay_left = (ALint)(lfo_value_left * state->frequency);
- lfo_value_right = 1.0f + sinf(fmodf(state->lfo_coeff *
- (offset + state->lfo_disp), 2 * F_PI));
- lfo_value_right *= state->depth * state->delay;
- lfo_value_right += state->delay;
- delay_right = (ALint)(lfo_value_right * state->frequency);
+ CalcSinusoidDelays(&delay_left, &delay_right, offset, state);
smp = state->SampleBufferLeft[(offset-delay_left) & mask];
- for (kt = 0; kt < MaxChannels; kt++)
- {
+ for(kt = 0;kt < MaxChannels;kt++)
SamplesOut[kt][it] += smp * state->Gain[0][kt];
- }
state->SampleBufferLeft[offset & mask] = (smp + SamplesIn[it]) * state->feedback;
+
smp = state->SampleBufferRight[(offset-delay_right) & mask];
- for (kt = 0; kt < MaxChannels; kt++)
- {
+ for(kt = 0;kt < MaxChannels;kt++)
SamplesOut[kt][it] += smp * state->Gain[1][kt];
- }
state->SampleBufferRight[offset & mask] = (smp + SamplesIn[it]) * state->feedback;
}
break;
}
- state->offset=offset;
+ state->offset = offset;
}
ALeffectState *FlangerCreate(void)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 06:37:18 +0000