Rename Alc to alc

1 files changed, 307 insertions, 0 deletions

diff --git a/alc/mixer/mixer_neon.cpp b/alc/mixer/mixer_neon.cpp
new file mode 100644
index 00000000..fa487d97
--- /dev/null
+++ b/alc/mixer/mixer_neon.cpp
@@ -0,0 +1,307 @@
+#include "config.h"
+
+#include <arm_neon.h>
+
+#include <limits>
+
+#include "AL/al.h"
+#include "AL/alc.h"
+#include "alcmain.h"
+#include "alu.h"
+#include "hrtf.h"
+#include "defs.h"
+#include "hrtfbase.h"
+
+
+
+template<>
+const ALfloat *Resample_<LerpTag,NEONTag>(const InterpState*, const ALfloat *RESTRICT src,
+    ALsizei frac, ALint increment, ALfloat *RESTRICT dst, ALsizei dstlen)
+{
+    const int32x4_t increment4 = vdupq_n_s32(increment*4);
+    const float32x4_t fracOne4 = vdupq_n_f32(1.0f/FRACTIONONE);
+    const int32x4_t fracMask4 = vdupq_n_s32(FRACTIONMASK);
+    alignas(16) ALsizei pos_[4], frac_[4];
+    int32x4_t pos4, frac4;
+    ALsizei todo, pos, i;
+
+    ASSUME(frac >= 0);
+    ASSUME(increment > 0);
+    ASSUME(dstlen > 0);
+
+    InitiatePositionArrays(frac, increment, frac_, pos_, 4);
+    frac4 = vld1q_s32(frac_);
+    pos4 = vld1q_s32(pos_);
+
+    todo = dstlen & ~3;
+    for(i = 0;i < todo;i += 4)
+    {
+        const int pos0 = vgetq_lane_s32(pos4, 0);
+        const int pos1 = vgetq_lane_s32(pos4, 1);
+        const int pos2 = vgetq_lane_s32(pos4, 2);
+        const int pos3 = vgetq_lane_s32(pos4, 3);
+        const float32x4_t val1 = (float32x4_t){src[pos0], src[pos1], src[pos2], src[pos3]};
+        const float32x4_t val2 = (float32x4_t){src[pos0+1], src[pos1+1], src[pos2+1], src[pos3+1]};
+
+        /* val1 + (val2-val1)*mu */
+        const float32x4_t r0 = vsubq_f32(val2, val1);
+        const float32x4_t mu = vmulq_f32(vcvtq_f32_s32(frac4), fracOne4);
+        const float32x4_t out = vmlaq_f32(val1, mu, r0);
+
+        vst1q_f32(&dst[i], out);
+
+        frac4 = vaddq_s32(frac4, increment4);
+        pos4 = vaddq_s32(pos4, vshrq_n_s32(frac4, FRACTIONBITS));
+        frac4 = vandq_s32(frac4, fracMask4);
+    }
+
+    /* NOTE: These four elements represent the position *after* the last four
+     * samples, so the lowest element is the next position to resample.
+     */
+    pos = vgetq_lane_s32(pos4, 0);
+    frac = vgetq_lane_s32(frac4, 0);
+
+    for(;i < dstlen;++i)
+    {
+        dst[i] = lerp(src[pos], src[pos+1], frac * (1.0f/FRACTIONONE));
+
+        frac += increment;
+        pos  += frac>>FRACTIONBITS;
+        frac &= FRACTIONMASK;
+    }
+    return dst;
+}
+
+template<>
+const ALfloat *Resample_<BSincTag,NEONTag>(const InterpState *state, const ALfloat *RESTRICT src,
+    ALsizei frac, ALint increment, ALfloat *RESTRICT dst, ALsizei dstlen)
+{
+    const ALfloat *const filter = state->bsinc.filter;
+    const float32x4_t sf4 = vdupq_n_f32(state->bsinc.sf);
+    const ALsizei m = state->bsinc.m;
+    const float32x4_t *fil, *scd, *phd, *spd;
+    ALsizei pi, i, j, offset;
+    float32x4_t r4;
+    ALfloat pf;
+
+    ASSUME(m > 0);
+    ASSUME(dstlen > 0);
+    ASSUME(increment > 0);
+    ASSUME(frac >= 0);
+
+    src -= state->bsinc.l;
+    for(i = 0;i < dstlen;i++)
+    {
+        // Calculate the phase index and factor.
+#define FRAC_PHASE_BITDIFF (FRACTIONBITS-BSINC_PHASE_BITS)
+        pi = frac >> FRAC_PHASE_BITDIFF;
+        pf = (frac & ((1<<FRAC_PHASE_BITDIFF)-1)) * (1.0f/(1<<FRAC_PHASE_BITDIFF));
+#undef FRAC_PHASE_BITDIFF
+
+        offset = m*pi*4;
+        fil = (const float32x4_t*)(filter + offset); offset += m;
+        scd = (const float32x4_t*)(filter + offset); offset += m;
+        phd = (const float32x4_t*)(filter + offset); offset += m;
+        spd = (const float32x4_t*)(filter + offset);
+
+        // Apply the scale and phase interpolated filter.
+        r4 = vdupq_n_f32(0.0f);
+        {
+            const ALsizei count = m >> 2;
+            const float32x4_t pf4 = vdupq_n_f32(pf);
+
+            ASSUME(count > 0);
+
+            for(j = 0;j < count;j++)
+            {
+                /* f = ((fil + sf*scd) + pf*(phd + sf*spd)) */
+                const float32x4_t f4 = vmlaq_f32(
+                    vmlaq_f32(fil[j], sf4, scd[j]),
+                    pf4, vmlaq_f32(phd[j], sf4, spd[j])
+                );
+                /* r += f*src */
+                r4 = vmlaq_f32(r4, f4, vld1q_f32(&src[j*4]));
+            }
+        }
+        r4 = vaddq_f32(r4, vcombine_f32(vrev64_f32(vget_high_f32(r4)),
+                                        vrev64_f32(vget_low_f32(r4))));
+        dst[i] = vget_lane_f32(vadd_f32(vget_low_f32(r4), vget_high_f32(r4)), 0);
+
+        frac += increment;
+        src  += frac>>FRACTIONBITS;
+        frac &= FRACTIONMASK;
+    }
+    return dst;
+}
+
+
+static inline void ApplyCoeffs(ALsizei /*Offset*/, float2 *RESTRICT Values, const ALsizei IrSize,
+    const HrirArray<ALfloat> &Coeffs, const ALfloat left, const ALfloat right)
+{
+    ASSUME(IrSize >= 2);
+
+    float32x4_t leftright4;
+    {
+        float32x2_t leftright2 = vdup_n_f32(0.0);
+        leftright2 = vset_lane_f32(left, leftright2, 0);
+        leftright2 = vset_lane_f32(right, leftright2, 1);
+        leftright4 = vcombine_f32(leftright2, leftright2);
+    }
+
+    for(ALsizei c{0};c < IrSize;c += 2)
+    {
+        float32x4_t vals = vcombine_f32(vld1_f32((float32_t*)&Values[c  ][0]),
+                                        vld1_f32((float32_t*)&Values[c+1][0]));
+        float32x4_t coefs = vld1q_f32((float32_t*)&Coeffs[c][0]);
+
+        vals = vmlaq_f32(vals, coefs, leftright4);
+
+        vst1_f32((float32_t*)&Values[c  ][0], vget_low_f32(vals));
+        vst1_f32((float32_t*)&Values[c+1][0], vget_high_f32(vals));
+    }
+}
+
+template<>
+void MixHrtf_<NEONTag>(FloatBufferLine &LeftOut, FloatBufferLine &RightOut,
+    const ALfloat *InSamples, float2 *AccumSamples, const ALsizei OutPos, const ALsizei IrSize,
+    MixHrtfFilter *hrtfparams, const ALsizei BufferSize)
+{
+    MixHrtfBase<ApplyCoeffs>(LeftOut, RightOut, InSamples, AccumSamples, OutPos, IrSize,
+        hrtfparams, BufferSize);
+}
+
+template<>
+void MixHrtfBlend_<NEONTag>(FloatBufferLine &LeftOut, FloatBufferLine &RightOut,
+    const ALfloat *InSamples, float2 *AccumSamples, const ALsizei OutPos, const ALsizei IrSize,
+    const HrtfFilter *oldparams, MixHrtfFilter *newparams, const ALsizei BufferSize)
+{
+    MixHrtfBlendBase<ApplyCoeffs>(LeftOut, RightOut, InSamples, AccumSamples, OutPos, IrSize,
+        oldparams, newparams, BufferSize);
+}
+
+template<>
+void MixDirectHrtf_<NEONTag>(FloatBufferLine &LeftOut, FloatBufferLine &RightOut,
+    const al::span<const FloatBufferLine> InSamples, float2 *AccumSamples, DirectHrtfState *State,
+    const ALsizei BufferSize)
+{
+    MixDirectHrtfBase<ApplyCoeffs>(LeftOut, RightOut, InSamples, AccumSamples, State, BufferSize);
+}
+
+
+template<>
+void Mix_<NEONTag>(const ALfloat *data, const al::span<FloatBufferLine> OutBuffer,
+    ALfloat *CurrentGains, const ALfloat *TargetGains, const ALsizei Counter, const ALsizei OutPos,
+    const ALsizei BufferSize)
+{
+    ASSUME(BufferSize > 0);
+
+    const ALfloat delta{(Counter > 0) ? 1.0f/(ALfloat)Counter : 0.0f};
+    for(FloatBufferLine &output : OutBuffer)
+    {
+        ALfloat *RESTRICT dst{al::assume_aligned<16>(output.data()+OutPos)};
+        ALfloat gain{*CurrentGains};
+        const ALfloat diff{*TargetGains - gain};
+
+        ALsizei pos{0};
+        if(std::fabs(diff) > std::numeric_limits<float>::epsilon())
+        {
+            ALsizei minsize{mini(BufferSize, Counter)};
+            const ALfloat step{diff * delta};
+            ALfloat step_count{0.0f};
+            /* Mix with applying gain steps in aligned multiples of 4. */
+            if(LIKELY(minsize > 3))
+            {
+                const float32x4_t four4{vdupq_n_f32(4.0f)};
+                const float32x4_t step4{vdupq_n_f32(step)};
+                const float32x4_t gain4{vdupq_n_f32(gain)};
+                float32x4_t step_count4{vsetq_lane_f32(0.0f,
+                    vsetq_lane_f32(1.0f,
+                    vsetq_lane_f32(2.0f,
+                    vsetq_lane_f32(3.0f, vdupq_n_f32(0.0f), 3),
+                    2), 1), 0
+                )};
+                ALsizei todo{minsize >> 2};
+
+                do {
+                    const float32x4_t val4 = vld1q_f32(&data[pos]);
+                    float32x4_t dry4 = vld1q_f32(&dst[pos]);
+                    dry4 = vmlaq_f32(dry4, val4, vmlaq_f32(gain4, step4, step_count4));
+                    step_count4 = vaddq_f32(step_count4, four4);
+                    vst1q_f32(&dst[pos], dry4);
+                    pos += 4;
+                } while(--todo);
+                /* NOTE: step_count4 now represents the next four counts after
+                 * the last four mixed samples, so the lowest element
+                 * represents the next step count to apply.
+                 */
+                step_count = vgetq_lane_f32(step_count4, 0);
+            }
+            /* Mix with applying left over gain steps that aren't aligned multiples of 4. */
+            for(;pos < minsize;pos++)
+            {
+                dst[pos] += data[pos]*(gain + step*step_count);
+                step_count += 1.0f;
+            }
+            if(pos == Counter)
+                gain = *TargetGains;
+            else
+                gain += step*step_count;
+            *CurrentGains = gain;
+
+            /* Mix until pos is aligned with 4 or the mix is done. */
+            minsize = mini(BufferSize, (pos+3)&~3);
+            for(;pos < minsize;pos++)
+                dst[pos] += data[pos]*gain;
+        }
+        ++CurrentGains;
+        ++TargetGains;
+
+        if(!(std::fabs(gain) > GAIN_SILENCE_THRESHOLD))
+            continue;
+        if(LIKELY(BufferSize-pos > 3))
+        {
+            ALsizei todo{(BufferSize-pos) >> 2};
+            const float32x4_t gain4 = vdupq_n_f32(gain);
+            do {
+                const float32x4_t val4 = vld1q_f32(&data[pos]);
+                float32x4_t dry4 = vld1q_f32(&dst[pos]);
+                dry4 = vmlaq_f32(dry4, val4, gain4);
+                vst1q_f32(&dst[pos], dry4);
+                pos += 4;
+            } while(--todo);
+        }
+        for(;pos < BufferSize;pos++)
+            dst[pos] += data[pos]*gain;
+    }
+}
+
+template<>
+void MixRow_<NEONTag>(FloatBufferLine &OutBuffer, const ALfloat *Gains,
+    const al::span<const FloatBufferLine> InSamples, const ALsizei InPos, const ALsizei BufferSize)
+{
+    ASSUME(BufferSize > 0);
+
+    for(const FloatBufferLine &input : InSamples)
+    {
+        const ALfloat *RESTRICT src{al::assume_aligned<16>(input.data()+InPos)};
+        const ALfloat gain{*(Gains++)};
+        if(!(std::fabs(gain) > GAIN_SILENCE_THRESHOLD))
+            continue;
+
+        ALsizei pos{0};
+        if(LIKELY(BufferSize > 3))
+        {
+            ALsizei todo{BufferSize >> 2};
+            float32x4_t gain4{vdupq_n_f32(gain)};
+            do {
+                const float32x4_t val4 = vld1q_f32(&src[pos]);
+                float32x4_t dry4 = vld1q_f32(&OutBuffer[pos]);
+                dry4 = vmlaq_f32(dry4, val4, gain4);
+                vst1q_f32(&OutBuffer[pos], dry4);
+                pos += 4;
+            } while(--todo);
+        }
+        for(;pos < BufferSize;pos++)
+            OutBuffer[pos] += src[pos]*gain;
+    }
+}