diff options
Diffstat (limited to 'Alc/effects/flanger.c')
| -rw-r--r-- | Alc/effects/flanger.c | 127 |
1 files changed, 59 insertions, 68 deletions
diff --git a/Alc/effects/flanger.c b/Alc/effects/flanger.c index d330511a..b25b95cc 100644 --- a/Alc/effects/flanger.c +++ b/Alc/effects/flanger.c @@ -172,107 +172,98 @@ static ALvoid ALflangerState_update(ALflangerState *state, const ALCdevice *Devi } } -static inline void Triangle(ALint *delay_left, ALint *delay_right, ALuint offset, const ALflangerState *state) +static void GetTriangleDelays(ALint *restrict delays, ALsizei offset, const ALsizei lfo_range, + const ALfloat lfo_scale, const ALfloat depth, const ALsizei delay, + const ALsizei todo) { - ALfloat lfo_value; - - 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 = 1.0f - fabsf(2.0f - state->lfo_scale*(offset%state->lfo_range)); - lfo_value *= state->depth; - *delay_right = fastf2i(lfo_value) + state->delay; + ALsizei i; + for(i = 0;i < todo;i++) + { + delays[i] = fastf2i((1.0f - fabsf(2.0f - lfo_scale*offset)) * depth) + delay; + offset = (offset+1)%lfo_range; + } } -static inline void Sinusoid(ALint *delay_left, ALint *delay_right, ALuint offset, const ALflangerState *state) +static void GetSinusoidDelays(ALint *restrict delays, ALsizei offset, const ALsizei lfo_range, + const ALfloat lfo_scale, const ALfloat depth, const ALsizei delay, + const ALsizei todo) { - ALfloat lfo_value; - - 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 = sinf(state->lfo_scale*(offset%state->lfo_range)); - lfo_value *= state->depth; - *delay_right = fastf2i(lfo_value) + state->delay; -} - -#define DECL_TEMPLATE(Func) \ -static void Process##Func(ALflangerState *state, const ALsizei SamplesToDo, \ - const ALfloat *restrict SamplesIn, ALfloat (*restrict out)[2]) \ -{ \ - const ALsizei bufmask = state->BufferLength-1; \ - ALfloat *restrict leftbuf = state->SampleBuffer[0]; \ - ALfloat *restrict rightbuf = state->SampleBuffer[1]; \ - ALsizei offset = state->offset; \ - const ALfloat feedback = state->feedback; \ - ALsizei it; \ - \ - for(it = 0;it < SamplesToDo;it++) \ - { \ - 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] * feedback; \ - \ - rightbuf[offset&bufmask] = SamplesIn[it]; \ - out[it][1] = rightbuf[(offset-delay_right)&bufmask]; \ - rightbuf[offset&bufmask] += out[it][1] * feedback; \ - \ - offset++; \ - } \ - state->offset = offset; \ + ALsizei i; + for(i = 0;i < todo;i++) + { + delays[i] = fastf2i(sinf(lfo_scale*offset) * depth) + delay; + offset = (offset+1)%lfo_range; + } } -DECL_TEMPLATE(Triangle) -DECL_TEMPLATE(Sinusoid) - -#undef DECL_TEMPLATE - static ALvoid ALflangerState_process(ALflangerState *state, ALsizei SamplesToDo, const ALfloat (*restrict SamplesIn)[BUFFERSIZE], ALfloat (*restrict SamplesOut)[BUFFERSIZE], ALsizei NumChannels) { - ALsizei it, kt; + ALfloat *restrict leftbuf = state->SampleBuffer[0]; + ALfloat *restrict rightbuf = state->SampleBuffer[1]; + const ALsizei bufmask = state->BufferLength-1; + const ALfloat feedback = state->feedback; + ALsizei offset = state->offset; + ALsizei i, c; ALsizei base; for(base = 0;base < SamplesToDo;) { + const ALsizei todo = mini(128, SamplesToDo-base); ALfloat temps[128][2]; - ALsizei td = mini(128, SamplesToDo-base); + ALint moddelays[2][128]; switch(state->waveform) { case FWF_Triangle: - ProcessTriangle(state, td, SamplesIn[0]+base, temps); + GetTriangleDelays(moddelays[0], offset%state->lfo_range, state->lfo_range, + state->lfo_scale, state->depth, state->delay, todo); + GetTriangleDelays(moddelays[1], (offset+state->lfo_disp)%state->lfo_range, + state->lfo_range, state->lfo_scale, state->depth, state->delay, + todo); break; case FWF_Sinusoid: - ProcessSinusoid(state, td, SamplesIn[0]+base, temps); + GetSinusoidDelays(moddelays[0], offset%state->lfo_range, state->lfo_range, + state->lfo_scale, state->depth, state->delay, todo); + GetSinusoidDelays(moddelays[1], (offset+state->lfo_disp)%state->lfo_range, + state->lfo_range, state->lfo_scale, state->depth, state->delay, + todo); break; } - for(kt = 0;kt < NumChannels;kt++) + for(i = 0;i < todo;i++) { - ALfloat gain = state->Gain[0][kt]; + leftbuf[offset&bufmask] = SamplesIn[0][base+i]; + temps[i][0] = leftbuf[(offset-moddelays[0][i])&bufmask] * feedback; + leftbuf[offset&bufmask] += temps[i][0]; + + rightbuf[offset&bufmask] = SamplesIn[0][base+i]; + temps[i][1] = rightbuf[(offset-moddelays[1][i])&bufmask] * feedback; + rightbuf[offset&bufmask] += temps[i][1]; + + offset++; + } + + for(c = 0;c < NumChannels;c++) + { + ALfloat gain = state->Gain[0][c]; if(fabsf(gain) > GAIN_SILENCE_THRESHOLD) { - for(it = 0;it < td;it++) - SamplesOut[kt][it+base] += temps[it][0] * gain; + for(i = 0;i < todo;i++) + SamplesOut[c][i+base] += temps[i][0] * gain; } - gain = state->Gain[1][kt]; + gain = state->Gain[1][c]; if(fabsf(gain) > GAIN_SILENCE_THRESHOLD) { - for(it = 0;it < td;it++) - SamplesOut[kt][it+base] += temps[it][1] * gain; + for(i = 0;i < todo;i++) + SamplesOut[c][i+base] += temps[i][1] * gain; } } - base += td; + base += todo; } + + state->offset = offset; } |