diff options
Diffstat (limited to 'Alc/effects/chorus.c')
| -rw-r--r-- | Alc/effects/chorus.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/Alc/effects/chorus.c b/Alc/effects/chorus.c index df8721b3..21db73f6 100644 --- a/Alc/effects/chorus.c +++ b/Alc/effects/chorus.c @@ -91,7 +91,7 @@ static ALboolean ALchorusState_deviceUpdate(ALchorusState *state, ALCdevice *Dev ALsizei maxlen; ALsizei it; - maxlen = fastf2u(AL_CHORUS_MAX_DELAY * 3.0f * Device->Frequency) + 1; + maxlen = fastf2u(AL_CHORUS_MAX_DELAY * 2.0f * Device->Frequency) + 1; maxlen = NextPowerOf2(maxlen); if(maxlen != state->BufferLength) @@ -131,9 +131,10 @@ static ALvoid ALchorusState_update(ALchorusState *state, const ALCdevice *Device state->waveform = CWF_Sinusoid; break; } - state->depth = props->Chorus.Depth; state->feedback = props->Chorus.Feedback; state->delay = fastf2i(props->Chorus.Delay * frequency); + /* The LFO depth is scaled to be relative to the sample delay. */ + state->depth = props->Chorus.Depth * state->delay; /* Gains for left and right sides */ CalcAngleCoeffs(-F_PI_2, 0.0f, 0.0f, coeffs); @@ -172,13 +173,13 @@ static inline void Triangle(ALint *delay_left, ALint *delay_right, ALuint offset { ALfloat lfo_value; - lfo_value = 2.0f - fabsf(2.0f - state->lfo_scale*(offset%state->lfo_range)); - lfo_value *= state->depth * state->delay; + lfo_value = 1.0f - fabsf(2.0f - state->lfo_scale*(offset%state->lfo_range)); + lfo_value *= state->depth; *delay_left = fastf2i(lfo_value) + state->delay; offset += state->lfo_disp; - lfo_value = 2.0f - fabsf(2.0f - state->lfo_scale*(offset%state->lfo_range)); - lfo_value *= state->depth * state->delay; + lfo_value = 1.0f - fabsf(2.0f - state->lfo_scale*(offset%state->lfo_range)); + lfo_value *= state->depth; *delay_right = fastf2i(lfo_value) + state->delay; } @@ -186,13 +187,13 @@ static inline void Sinusoid(ALint *delay_left, ALint *delay_right, ALuint offset { ALfloat lfo_value; - lfo_value = 1.0f + sinf(state->lfo_scale*(offset%state->lfo_range)); - lfo_value *= state->depth * state->delay; + lfo_value = sinf(state->lfo_scale*(offset%state->lfo_range)); + lfo_value *= state->depth; *delay_left = fastf2i(lfo_value) + state->delay; offset += state->lfo_disp; - lfo_value = 1.0f + sinf(state->lfo_scale*(offset%state->lfo_range)); - lfo_value *= state->depth * state->delay; + lfo_value = sinf(state->lfo_scale*(offset%state->lfo_range)); + lfo_value *= state->depth; *delay_right = fastf2i(lfo_value) + state->delay; } @@ -212,11 +213,13 @@ static void Process##Func(ALchorusState *state, const ALsizei SamplesToDo, \ ALint delay_left, delay_right; \ Func(&delay_left, &delay_right, offset, state); \ \ + leftbuf[offset&bufmask] = SamplesIn[it]; \ out[it][0] = leftbuf[(offset-delay_left)&bufmask]; \ - leftbuf[offset&bufmask] = (out[it][0]+SamplesIn[it]) * feedback; \ + leftbuf[offset&bufmask] += out[it][0] * feedback; \ \ + rightbuf[offset&bufmask] = SamplesIn[it]; \ out[it][1] = rightbuf[(offset-delay_right)&bufmask]; \ - rightbuf[offset&bufmask] = (out[it][1]+SamplesIn[it]) * feedback; \ + rightbuf[offset&bufmask] += out[it][1] * feedback; \ \ offset++; \ } \ |