diff options
Diffstat (limited to 'Alc')
| -rw-r--r-- | Alc/effects/reverb.c | 126 |
1 files changed, 70 insertions, 56 deletions
diff --git a/Alc/effects/reverb.c b/Alc/effects/reverb.c index 9f83353c..87c1e8cf 100644 --- a/Alc/effects/reverb.c +++ b/Alc/effects/reverb.c @@ -90,7 +90,7 @@ typedef struct ALreverbState { // The gain for each output channel based on 3D panning (only for the // EAX path). - ALfloat PanGain[MAX_OUTPUT_CHANNELS]; + ALfloat PanGain[4][MAX_OUTPUT_CHANNELS]; } Early; // Decorrelator delay line. @@ -129,7 +129,7 @@ typedef struct ALreverbState { // The gain for each output channel based on 3D panning (only for the // EAX path). - ALfloat PanGain[MAX_OUTPUT_CHANNELS]; + ALfloat PanGain[4][MAX_OUTPUT_CHANNELS]; } Late; struct { @@ -161,7 +161,7 @@ typedef struct ALreverbState { // The gain for each output channel (non-EAX path only; aliased from // Late.PanGain) - ALfloat *Gain; + ALfloat (*Gain)[MAX_OUTPUT_CHANNELS]; /* Temporary storage used when processing. */ ALfloat ReverbSamples[MAX_UPDATE_SAMPLES][4]; @@ -565,7 +565,7 @@ static inline ALvoid EAXVerbPass(ALreverbState *State, ALuint todo, const ALfloa static ALvoid ALreverbState_processStandard(ALreverbState *State, ALuint SamplesToDo, const ALfloat *restrict SamplesIn, ALfloat (*restrict SamplesOut)[BUFFERSIZE], ALuint NumChannels) { ALfloat (*restrict out)[4] = State->ReverbSamples; - ALuint index, c, i; + ALuint index, c, i, l; /* Process reverb for these samples. */ for(index = 0;index < SamplesToDo;) @@ -574,13 +574,16 @@ static ALvoid ALreverbState_processStandard(ALreverbState *State, ALuint Samples VerbPass(State, todo, &SamplesIn[index], out); - for(c = 0;c < NumChannels;c++) + for(l = 0;l < 4;l++) { - ALfloat gain = State->Gain[c]; - if(!(fabsf(gain) > GAIN_SILENCE_THRESHOLD)) - continue; - for(i = 0;i < todo;i++) - SamplesOut[c][index+i] += gain*out[i][c&3]; + for(c = 0;c < NumChannels;c++) + { + ALfloat gain = State->Gain[l][c]; + if(!(fabsf(gain) > GAIN_SILENCE_THRESHOLD)) + continue; + for(i = 0;i < todo;i++) + SamplesOut[c][index+i] += gain*out[i][l]; + } } index += todo; @@ -591,7 +594,7 @@ static ALvoid ALreverbState_processEax(ALreverbState *State, ALuint SamplesToDo, { ALfloat (*restrict early)[4] = State->EarlySamples; ALfloat (*restrict late)[4] = State->ReverbSamples; - ALuint index, c, i; + ALuint index, c, i, l; ALfloat gain; /* Process reverb for these samples. */ @@ -601,19 +604,22 @@ static ALvoid ALreverbState_processEax(ALreverbState *State, ALuint SamplesToDo, EAXVerbPass(State, todo, &SamplesIn[index], early, late); - for(c = 0;c < NumChannels;c++) + for(l = 0;l < 4;l++) { - gain = State->Early.PanGain[c]; - if(fabsf(gain) > GAIN_SILENCE_THRESHOLD) - { - for(i = 0;i < todo;i++) - SamplesOut[c][index+i] += gain*early[i][c&3]; - } - gain = State->Late.PanGain[c]; - if(fabsf(gain) > GAIN_SILENCE_THRESHOLD) + for(c = 0;c < NumChannels;c++) { - for(i = 0;i < todo;i++) - SamplesOut[c][index+i] += gain*late[i][c&3]; + gain = State->Early.PanGain[l][c]; + if(fabsf(gain) > GAIN_SILENCE_THRESHOLD) + { + for(i = 0;i < todo;i++) + SamplesOut[c][index+i] += gain*early[i][l]; + } + gain = State->Late.PanGain[l][c]; + if(fabsf(gain) > GAIN_SILENCE_THRESHOLD) + { + for(i = 0;i < todo;i++) + SamplesOut[c][index+i] += gain*late[i][l]; + } } } @@ -1054,54 +1060,59 @@ static ALvoid UpdateEchoLine(ALfloat reverbGain, ALfloat lateGain, ALfloat echoT // Update the early and late 3D panning gains. static ALvoid Update3DPanning(const ALCdevice *Device, const ALfloat *ReflectionsPan, const ALfloat *LateReverbPan, ALfloat Gain, ALreverbState *State) { - ALfloat earlyPan[3] = { ReflectionsPan[0], ReflectionsPan[1], -ReflectionsPan[2] }; - ALfloat latePan[3] = { LateReverbPan[0], LateReverbPan[1], -LateReverbPan[2] }; - ALfloat AmbientGains[MAX_OUTPUT_CHANNELS]; - ALfloat DirGains[MAX_OUTPUT_CHANNELS]; - ALfloat length, invlen; + static const ALfloat EarlyPanAngles[4] = { + DEG2RAD(0.0f), DEG2RAD(-90.0f), DEG2RAD(90.0f), DEG2RAD(180.0f) + }, LatePanAngles[4] = { + DEG2RAD(45.0f), DEG2RAD(-45.0f), DEG2RAD(135.0f), DEG2RAD(-135.0f) + }; + ALfloat length, ev, az; ALuint i; - // Bost gain by sqrt(2)? Seems to better match other implementations.... - Gain *= 1.4142f; - - ComputeAmbientGains(Device, Gain, AmbientGains); - - length = earlyPan[0]*earlyPan[0] + earlyPan[1]*earlyPan[1] + earlyPan[2]*earlyPan[2]; + length = sqrtf(ReflectionsPan[0]*ReflectionsPan[0] + ReflectionsPan[1]*ReflectionsPan[1] + ReflectionsPan[2]*ReflectionsPan[2]); if(!(length > FLT_EPSILON)) { - for(i = 0;i < MAX_OUTPUT_CHANNELS;i++) - State->Early.PanGain[i] = AmbientGains[i]; + for(i = 0;i < 4;i++) + ComputeAngleGains(Device, EarlyPanAngles[i], 0.0f, Gain, State->Early.PanGain[i]); } else { - invlen = 1.0f / sqrtf(length); - earlyPan[0] *= invlen; - earlyPan[1] *= invlen; - earlyPan[2] *= invlen; + ev = asinf(clampf(ReflectionsPan[1]/length, -1.0f, 1.0f)); + az = atan2f(ReflectionsPan[0], ReflectionsPan[2]); length = minf(length, 1.0f); - ComputeDirectionalGains(Device, earlyPan, Gain, DirGains); - for(i = 0;i < MAX_OUTPUT_CHANNELS;i++) - State->Early.PanGain[i] = lerp(AmbientGains[i], DirGains[i], length); + for(i = 0;i < 4;i++) + { + /* This is essentially just a lerp, but takes the shortest path + * with respect to circular wrapping. e.g. + * -135 -> +/-180 -> +135 + * instead of + * -135 -> 0 -> +135 */ + float offset, naz, nev; + naz = EarlyPanAngles[i] + (modff(((az-EarlyPanAngles[i])*length + F_PI + F_TAU)/F_TAU, &offset)*F_TAU) - F_PI; + nev = (modff(((ev )*length + F_PI + F_TAU)/F_TAU, &offset)*F_TAU) - F_PI; + ComputeAngleGains(Device, naz, nev, Gain, State->Early.PanGain[i]); + } } - length = latePan[0]*latePan[0] + latePan[1]*latePan[1] + latePan[2]*latePan[2]; + length = sqrtf(LateReverbPan[0]*LateReverbPan[0] + LateReverbPan[1]*LateReverbPan[1] + LateReverbPan[2]*LateReverbPan[2]); if(!(length > FLT_EPSILON)) { - for(i = 0;i < MAX_OUTPUT_CHANNELS;i++) - State->Late.PanGain[i] = AmbientGains[i]; + for(i = 0;i < 4;i++) + ComputeAngleGains(Device, LatePanAngles[i], 0.0f, Gain, State->Late.PanGain[i]); } else { - invlen = 1.0f / sqrtf(length); - latePan[0] *= invlen; - latePan[1] *= invlen; - latePan[2] *= invlen; + ev = asinf(clampf(LateReverbPan[1]/length, -1.0f, 1.0f)); + az = atan2f(LateReverbPan[0], LateReverbPan[2]); length = minf(length, 1.0f); - ComputeDirectionalGains(Device, latePan, Gain, DirGains); - for(i = 0;i < MAX_OUTPUT_CHANNELS;i++) - State->Late.PanGain[i] = lerp(AmbientGains[i], DirGains[i], length); + for(i = 0;i < 4;i++) + { + float offset, naz, nev; + naz = LatePanAngles[i] + (modff(((az-LatePanAngles[i])*length + F_PI + F_TAU)/F_TAU, &offset)*F_TAU) - F_PI; + nev = (modff(((ev )*length + F_PI + F_TAU)/F_TAU, &offset)*F_TAU) - F_PI; + ComputeAngleGains(Device, naz, nev, Gain, State->Late.PanGain[i]); + } } } @@ -1193,7 +1204,7 @@ typedef struct ALreverbStateFactory { static ALeffectState *ALreverbStateFactory_create(ALreverbStateFactory* UNUSED(factory)) { ALreverbState *state; - ALuint index; + ALuint index, l; state = ALreverbState_New(sizeof(*state)); if(!state) return NULL; @@ -1253,10 +1264,13 @@ static ALeffectState *ALreverbStateFactory_create(ALreverbStateFactory* UNUSED(f state->Late.LpSample[index] = 0.0f; } - for(index = 0;index < MAX_OUTPUT_CHANNELS;index++) + for(l = 0;l < 4;l++) { - state->Early.PanGain[index] = 0.0f; - state->Late.PanGain[index] = 0.0f; + for(index = 0;index < MAX_OUTPUT_CHANNELS;index++) + { + state->Early.PanGain[l][index] = 0.0f; + state->Late.PanGain[l][index] = 0.0f; + } } state->Echo.DensityGain = 0.0f; |