Move remaining effects to the effects subdir

1 files changed, 324 insertions, 0 deletions

diff --git a/Alc/effects/echo.c b/Alc/effects/echo.c
new file mode 100644
index 00000000..d5915295
--- /dev/null
+++ b/Alc/effects/echo.c
@@ -0,0 +1,324 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2009 by Chris Robinson.
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ *  Boston, MA  02111-1307, USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#include <math.h>
+#include <stdlib.h>
+
+#include "alMain.h"
+#include "alFilter.h"
+#include "alAuxEffectSlot.h"
+#include "alError.h"
+#include "alu.h"
+
+
+typedef struct ALechoStateFactory {
+    DERIVE_FROM_TYPE(ALeffectStateFactory);
+} ALechoStateFactory;
+
+static ALechoStateFactory EchoFactory;
+
+
+typedef struct ALechoState {
+    DERIVE_FROM_TYPE(ALeffectState);
+
+    ALfloat *SampleBuffer;
+    ALuint BufferLength;
+
+    // The echo is two tap. The delay is the number of samples from before the
+    // current offset
+    struct {
+        ALuint delay;
+    } Tap[2];
+    ALuint Offset;
+    /* The panning gains for the two taps */
+    ALfloat Gain[2][MaxChannels];
+
+    ALfloat FeedGain;
+
+    FILTER iirFilter;
+} ALechoState;
+
+static ALvoid ALechoState_Destruct(ALechoState *state)
+{
+    free(state->SampleBuffer);
+    state->SampleBuffer = NULL;
+}
+
+static ALboolean ALechoState_DeviceUpdate(ALechoState *state, ALCdevice *Device)
+{
+    ALuint maxlen, i;
+
+    // Use the next power of 2 for the buffer length, so the tap offsets can be
+    // wrapped using a mask instead of a modulo
+    maxlen  = fastf2u(AL_ECHO_MAX_DELAY * Device->Frequency) + 1;
+    maxlen += fastf2u(AL_ECHO_MAX_LRDELAY * Device->Frequency) + 1;
+    maxlen  = NextPowerOf2(maxlen);
+
+    if(maxlen != state->BufferLength)
+    {
+        void *temp;
+
+        temp = realloc(state->SampleBuffer, maxlen * sizeof(ALfloat));
+        if(!temp)
+            return AL_FALSE;
+        state->SampleBuffer = temp;
+        state->BufferLength = maxlen;
+    }
+    for(i = 0;i < state->BufferLength;i++)
+        state->SampleBuffer[i] = 0.0f;
+
+    return AL_TRUE;
+}
+
+static ALvoid ALechoState_Update(ALechoState *state, ALCdevice *Device, const ALeffectslot *Slot)
+{
+    ALuint frequency = Device->Frequency;
+    ALfloat lrpan, cw, g, gain;
+    ALfloat dirGain;
+    ALuint i;
+
+    state->Tap[0].delay = fastf2u(Slot->effect.Echo.Delay * frequency) + 1;
+    state->Tap[1].delay = fastf2u(Slot->effect.Echo.LRDelay * frequency);
+    state->Tap[1].delay += state->Tap[0].delay;
+
+    lrpan = Slot->effect.Echo.Spread;
+
+    state->FeedGain = Slot->effect.Echo.Feedback;
+
+    cw = cosf(F_PI*2.0f * LOWPASSFREQREF / frequency);
+    g = 1.0f - Slot->effect.Echo.Damping;
+    state->iirFilter.coeff = lpCoeffCalc(g, cw);
+
+    gain = Slot->Gain;
+    for(i = 0;i < MaxChannels;i++)
+    {
+        state->Gain[0][i] = 0.0f;
+        state->Gain[1][i] = 0.0f;
+    }
+
+    dirGain = fabsf(lrpan);
+
+    /* First tap panning */
+    ComputeAngleGains(Device, atan2f(-lrpan, 0.0f), (1.0f-dirGain)*F_PI, gain, state->Gain[0]);
+
+    /* Second tap panning */
+    ComputeAngleGains(Device, atan2f(+lrpan, 0.0f), (1.0f-dirGain)*F_PI, gain, state->Gain[1]);
+}
+
+static ALvoid ALechoState_Process(ALechoState *state, ALuint SamplesToDo, const ALfloat *restrict SamplesIn, ALfloat (*restrict SamplesOut)[BUFFERSIZE])
+{
+    const ALuint mask = state->BufferLength-1;
+    const ALuint tap1 = state->Tap[0].delay;
+    const ALuint tap2 = state->Tap[1].delay;
+    ALuint offset = state->Offset;
+    ALfloat smp;
+    ALuint base;
+    ALuint i, k;
+
+    for(base = 0;base < SamplesToDo;)
+    {
+        ALfloat temps[64][2];
+        ALuint td = minu(SamplesToDo-base, 64);
+
+        for(i = 0;i < td;i++)
+        {
+            /* First tap */
+            temps[i][0] = state->SampleBuffer[(offset-tap1) & mask];
+            /* Second tap */
+            temps[i][1] = state->SampleBuffer[(offset-tap2) & mask];
+
+            // Apply damping and feedback gain to the second tap, and mix in the
+            // new sample
+            smp = lpFilter2P(&state->iirFilter, temps[i][1]+SamplesIn[i]);
+            state->SampleBuffer[offset&mask] = smp * state->FeedGain;
+        }
+
+        for(k = 0;k < MaxChannels;k++)
+        {
+            ALfloat gain = state->Gain[0][k];
+            if(gain > 0.00001f)
+            {
+                for(i = 0;i < td;i++)
+                    SamplesOut[k][i+base] += temps[i][0] * gain;
+            }
+
+            gain = state->Gain[1][k];
+            if(gain > 0.00001f)
+            {
+                for(i = 0;i < td;i++)
+                    SamplesOut[k][i+base] += temps[i][1] * gain;
+            }
+        }
+
+        base += td;
+    }
+
+    state->Offset = offset;
+}
+
+static ALeffectStateFactory *ALechoState_getCreator(void)
+{
+    return STATIC_CAST(ALeffectStateFactory, &EchoFactory);
+}
+
+DEFINE_ALEFFECTSTATE_VTABLE(ALechoState);
+
+
+ALeffectState *ALechoStateFactory_create(void)
+{
+    ALechoState *state;
+
+    state = malloc(sizeof(*state));
+    if(!state) return NULL;
+    SET_VTABLE2(ALechoState, ALeffectState, state);
+
+    state->BufferLength = 0;
+    state->SampleBuffer = NULL;
+
+    state->Tap[0].delay = 0;
+    state->Tap[1].delay = 0;
+    state->Offset = 0;
+
+    state->iirFilter.coeff = 0.0f;
+    state->iirFilter.history[0] = 0.0f;
+    state->iirFilter.history[1] = 0.0f;
+
+    return STATIC_CAST(ALeffectState, state);
+}
+
+static ALvoid ALechoStateFactory_destroy(ALeffectState *effect)
+{
+    ALechoState *state = STATIC_UPCAST(ALechoState, ALeffectState, effect);
+    ALechoState_Destruct(state);
+    free(state);
+}
+
+DEFINE_ALEFFECTSTATEFACTORY_VTABLE(ALechoStateFactory);
+
+
+static void init_echo_factory(void)
+{
+    SET_VTABLE2(ALechoStateFactory, ALeffectStateFactory, &EchoFactory);
+}
+
+ALeffectStateFactory *ALechoStateFactory_getFactory(void)
+{
+    static pthread_once_t once = PTHREAD_ONCE_INIT;
+    pthread_once(&once, init_echo_factory);
+    return STATIC_CAST(ALeffectStateFactory, &EchoFactory);
+}
+
+
+void echo_SetParami(ALeffect *effect, ALCcontext *context, ALenum param, ALint val)
+{ (void)effect;(void)param;(void)val; alSetError(context, AL_INVALID_ENUM); }
+void echo_SetParamiv(ALeffect *effect, ALCcontext *context, ALenum param, const ALint *vals)
+{
+    echo_SetParami(effect, context, param, vals[0]);
+}
+void echo_SetParamf(ALeffect *effect, ALCcontext *context, ALenum param, ALfloat val)
+{
+    switch(param)
+    {
+        case AL_ECHO_DELAY:
+            if(val >= AL_ECHO_MIN_DELAY && val <= AL_ECHO_MAX_DELAY)
+                effect->Echo.Delay = val;
+            else
+                alSetError(context, AL_INVALID_VALUE);
+            break;
+
+        case AL_ECHO_LRDELAY:
+            if(val >= AL_ECHO_MIN_LRDELAY && val <= AL_ECHO_MAX_LRDELAY)
+                effect->Echo.LRDelay = val;
+            else
+                alSetError(context, AL_INVALID_VALUE);
+            break;
+
+        case AL_ECHO_DAMPING:
+            if(val >= AL_ECHO_MIN_DAMPING && val <= AL_ECHO_MAX_DAMPING)
+                effect->Echo.Damping = val;
+            else
+                alSetError(context, AL_INVALID_VALUE);
+            break;
+
+        case AL_ECHO_FEEDBACK:
+            if(val >= AL_ECHO_MIN_FEEDBACK && val <= AL_ECHO_MAX_FEEDBACK)
+                effect->Echo.Feedback = val;
+            else
+                alSetError(context, AL_INVALID_VALUE);
+            break;
+
+        case AL_ECHO_SPREAD:
+            if(val >= AL_ECHO_MIN_SPREAD && val <= AL_ECHO_MAX_SPREAD)
+                effect->Echo.Spread = val;
+            else
+                alSetError(context, AL_INVALID_VALUE);
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM);
+            break;
+    }
+}
+void echo_SetParamfv(ALeffect *effect, ALCcontext *context, ALenum param, const ALfloat *vals)
+{
+    echo_SetParamf(effect, context, param, vals[0]);
+}
+
+void echo_GetParami(ALeffect *effect, ALCcontext *context, ALenum param, ALint *val)
+{ (void)effect;(void)param;(void)val; alSetError(context, AL_INVALID_ENUM); }
+void echo_GetParamiv(ALeffect *effect, ALCcontext *context, ALenum param, ALint *vals)
+{
+    echo_GetParami(effect, context, param, vals);
+}
+void echo_GetParamf(ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *val)
+{
+    switch(param)
+    {
+        case AL_ECHO_DELAY:
+            *val = effect->Echo.Delay;
+            break;
+
+        case AL_ECHO_LRDELAY:
+            *val = effect->Echo.LRDelay;
+            break;
+
+        case AL_ECHO_DAMPING:
+            *val = effect->Echo.Damping;
+            break;
+
+        case AL_ECHO_FEEDBACK:
+            *val = effect->Echo.Feedback;
+            break;
+
+        case AL_ECHO_SPREAD:
+            *val = effect->Echo.Spread;
+            break;
+
+        default:
+            alSetError(context, AL_INVALID_ENUM);
+            break;
+    }
+}
+void echo_GetParamfv(ALeffect *effect, ALCcontext *context, ALenum param, ALfloat *vals)
+{
+    echo_GetParamf(effect, context, param, vals);
+}