Move the B-Format HRTF virtual speaker stuff to InitHrtfPanning

This keeps the decoder matrices and coefficient mapping together for if it
changes in the future.

3 files changed, 76 insertions, 88 deletions

diff --git a/Alc/hrtf.c b/Alc/hrtf.c
index 3fbb2eb1..d79168e1 100644
--- a/Alc/hrtf.c
+++ b/Alc/hrtf.c
@@ -136,82 +136,28 @@ void GetHrtfCoeffs(const struct Hrtf *Hrtf, ALfloat elevation, ALfloat azimuth,
 }
 
 
-ALsizei BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][2], ALsizei NumChannels, const ALsizei *AmbiMap)
+ALsizei BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][2], ALsizei NumChannels, const ALfloat (*restrict AmbiPoints)[2], const ALfloat (*restrict AmbiMatrix)[2][MAX_AMBI_COEFFS], ALsizei AmbiCount)
 {
-#define HRTF_AMBI_CHAN_COUNT 14
-    /* NOTE: azimuth goes clockwise. */
-    static const struct {
-        ALfloat elevation;
-        ALfloat azimuth;
-    } Ambi3DPoints[HRTF_AMBI_CHAN_COUNT] = {
-        { DEG2RAD( 90.0f), DEG2RAD(   0.0f) },
-        { DEG2RAD( 35.0f), DEG2RAD( -45.0f) },
-        { DEG2RAD( 35.0f), DEG2RAD(  45.0f) },
-        { DEG2RAD( 35.0f), DEG2RAD( 135.0f) },
-        { DEG2RAD( 35.0f), DEG2RAD(-135.0f) },
-        { DEG2RAD(  0.0f), DEG2RAD(   0.0f) },
-        { DEG2RAD(  0.0f), DEG2RAD(  90.0f) },
-        { DEG2RAD(  0.0f), DEG2RAD( 180.0f) },
-        { DEG2RAD(  0.0f), DEG2RAD( -90.0f) },
-        { DEG2RAD(-35.0f), DEG2RAD( -45.0f) },
-        { DEG2RAD(-35.0f), DEG2RAD(  45.0f) },
-        { DEG2RAD(-35.0f), DEG2RAD( 135.0f) },
-        { DEG2RAD(-35.0f), DEG2RAD(-135.0f) },
-        { DEG2RAD(-90.0f), DEG2RAD(   0.0f) },
-    };
-    static const ALfloat Ambi3DMatrixFOA[HRTF_AMBI_CHAN_COUNT][2][MAX_AMBI_COEFFS] = {
-        { { 1.88982237e-001f,  0.00000000e+000f,  1.90399923e-001f,  0.00000000e+000f }, { 7.14285714e-002f,  0.00000000e+000f,  1.24646009e-001f,  0.00000000e+000f } },
-        { { 1.88982237e-001f,  1.09057783e-001f,  1.09208910e-001f,  1.09057783e-001f }, { 7.14285714e-002f,  7.13950780e-002f,  7.14940135e-002f,  7.13950780e-002f } },
-        { { 1.88982237e-001f, -1.09057783e-001f,  1.09208910e-001f,  1.09057783e-001f }, { 7.14285714e-002f, -7.13950780e-002f,  7.14940135e-002f,  7.13950780e-002f } },
-        { { 1.88982237e-001f, -1.09057783e-001f,  1.09208910e-001f, -1.09057783e-001f }, { 7.14285714e-002f, -7.13950780e-002f,  7.14940135e-002f, -7.13950780e-002f } },
-        { { 1.88982237e-001f,  1.09057783e-001f,  1.09208910e-001f, -1.09057783e-001f }, { 7.14285714e-002f,  7.13950780e-002f,  7.14940135e-002f, -7.13950780e-002f } },
-        { { 1.88982237e-001f,  0.00000000e+000f,  0.00000000e+000f,  1.88281281e-001f }, { 7.14285714e-002f,  0.00000000e+000f,  0.00000000e+000f,  1.23259031e-001f } },
-        { { 1.88982237e-001f, -1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f }, { 7.14285714e-002f, -1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f } },
-        { { 1.88982237e-001f,  0.00000000e+000f,  0.00000000e+000f, -1.88281281e-001f }, { 7.14285714e-002f,  0.00000000e+000f,  0.00000000e+000f, -1.23259031e-001f } },
-        { { 1.88982237e-001f,  1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f }, { 7.14285714e-002f,  1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f } },
-        { { 1.88982237e-001f,  1.09057783e-001f, -1.09208910e-001f,  1.09057783e-001f }, { 7.14285714e-002f,  7.13950780e-002f, -7.14940135e-002f,  7.13950780e-002f } },
-        { { 1.88982237e-001f, -1.09057783e-001f, -1.09208910e-001f,  1.09057783e-001f }, { 7.14285714e-002f, -7.13950780e-002f, -7.14940135e-002f,  7.13950780e-002f } },
-        { { 1.88982237e-001f, -1.09057783e-001f, -1.09208910e-001f, -1.09057783e-001f }, { 7.14285714e-002f, -7.13950780e-002f, -7.14940135e-002f, -7.13950780e-002f } },
-        { { 1.88982237e-001f,  1.09057783e-001f, -1.09208910e-001f, -1.09057783e-001f }, { 7.14285714e-002f,  7.13950780e-002f, -7.14940135e-002f, -7.13950780e-002f } },
-        { { 1.88982237e-001f,  0.00000000e+000f, -1.90399923e-001f,  0.00000000e+000f }, { 7.14285714e-002f,  0.00000000e+000f, -1.24646009e-001f,  0.00000000e+000f } }
-    }, Ambi3DMatrixHOA[HRTF_AMBI_CHAN_COUNT][2][MAX_AMBI_COEFFS] = {
-        { { 1.43315266e-001f,  0.00000000e+000f,  1.90399923e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  1.18020996e-001f,  0.00000000e+000f,  0.00000000e+000f }, { 7.26741039e-002f,  0.00000000e+000f,  1.24646009e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  1.49618920e-001f,  0.00000000e+000f,  0.00000000e+000f } },
-        { { 1.40852210e-001f,  1.09057783e-001f,  1.09208910e-001f,  1.09057783e-001f,  7.58818830e-002f,  7.66295578e-002f, -3.28314629e-004f,  7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f,  7.13950780e-002f,  7.14940135e-002f,  7.13950780e-002f,  9.61978444e-002f,  9.71456952e-002f, -4.16214759e-004f,  9.71456952e-002f,  0.00000000e+000f } },
-        { { 1.40852210e-001f, -1.09057783e-001f,  1.09208910e-001f,  1.09057783e-001f, -7.58818830e-002f, -7.66295578e-002f, -3.28314629e-004f,  7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f, -7.13950780e-002f,  7.14940135e-002f,  7.13950780e-002f, -9.61978444e-002f, -9.71456952e-002f, -4.16214759e-004f,  9.71456952e-002f,  0.00000000e+000f } },
-        { { 1.40852210e-001f, -1.09057783e-001f,  1.09208910e-001f, -1.09057783e-001f,  7.58818830e-002f, -7.66295578e-002f, -3.28314629e-004f, -7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f, -7.13950780e-002f,  7.14940135e-002f, -7.13950780e-002f,  9.61978444e-002f, -9.71456952e-002f, -4.16214759e-004f, -9.71456952e-002f,  0.00000000e+000f } },
-        { { 1.40852210e-001f,  1.09057783e-001f,  1.09208910e-001f, -1.09057783e-001f, -7.58818830e-002f,  7.66295578e-002f, -3.28314629e-004f, -7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f,  7.13950780e-002f,  7.14940135e-002f, -7.13950780e-002f, -9.61978444e-002f,  9.71456952e-002f, -4.16214759e-004f, -9.71456952e-002f,  0.00000000e+000f } },
-        { { 1.39644596e-001f,  0.00000000e+000f,  0.00000000e+000f,  1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f, -5.83538687e-002f,  0.00000000e+000f,  1.01835015e-001f }, { 7.08127349e-002f,  0.00000000e+000f,  0.00000000e+000f,  1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f, -7.39770307e-002f,  0.00000000e+000f,  1.29099445e-001f } },
-        { { 1.39644596e-001f, -1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f, -5.83538687e-002f,  0.00000000e+000f, -1.01835015e-001f }, { 7.08127349e-002f, -1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f, -7.39770307e-002f,  0.00000000e+000f, -1.29099445e-001f } },
-        { { 1.39644596e-001f,  0.00000000e+000f,  0.00000000e+000f, -1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f, -5.83538687e-002f,  0.00000000e+000f,  1.01835015e-001f }, { 7.08127349e-002f,  0.00000000e+000f,  0.00000000e+000f, -1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f, -7.39770307e-002f,  0.00000000e+000f,  1.29099445e-001f } },
-        { { 1.39644596e-001f,  1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f, -5.83538687e-002f,  0.00000000e+000f, -1.01835015e-001f }, { 7.08127349e-002f,  1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f, -7.39770307e-002f,  0.00000000e+000f, -1.29099445e-001f } },
-        { { 1.40852210e-001f,  1.09057783e-001f, -1.09208910e-001f,  1.09057783e-001f,  7.58818830e-002f, -7.66295578e-002f, -3.28314629e-004f, -7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f,  7.13950780e-002f, -7.14940135e-002f,  7.13950780e-002f,  9.61978444e-002f, -9.71456952e-002f, -4.16214759e-004f, -9.71456952e-002f,  0.00000000e+000f } },
-        { { 1.40852210e-001f, -1.09057783e-001f, -1.09208910e-001f,  1.09057783e-001f, -7.58818830e-002f,  7.66295578e-002f, -3.28314629e-004f, -7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f, -7.13950780e-002f, -7.14940135e-002f,  7.13950780e-002f, -9.61978444e-002f,  9.71456952e-002f, -4.16214759e-004f, -9.71456952e-002f,  0.00000000e+000f } },
-        { { 1.40852210e-001f, -1.09057783e-001f, -1.09208910e-001f, -1.09057783e-001f,  7.58818830e-002f,  7.66295578e-002f, -3.28314629e-004f,  7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f, -7.13950780e-002f, -7.14940135e-002f, -7.13950780e-002f,  9.61978444e-002f,  9.71456952e-002f, -4.16214759e-004f,  9.71456952e-002f,  0.00000000e+000f } },
-        { { 1.40852210e-001f,  1.09057783e-001f, -1.09208910e-001f, -1.09057783e-001f, -7.58818830e-002f, -7.66295578e-002f, -3.28314629e-004f,  7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f,  7.13950780e-002f, -7.14940135e-002f, -7.13950780e-002f, -9.61978444e-002f, -9.71456952e-002f, -4.16214759e-004f,  9.71456952e-002f,  0.00000000e+000f } },
-        { { 1.43315266e-001f,  0.00000000e+000f, -1.90399923e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  1.18020996e-001f,  0.00000000e+000f,  0.00000000e+000f }, { 7.26741039e-002f,  0.00000000e+000f, -1.24646009e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  1.49618920e-001f,  0.00000000e+000f,  0.00000000e+000f } },
-    };
-    const ALfloat (*Ambi3DMatrix)[2][MAX_AMBI_COEFFS] = AmbiMap ? Ambi3DMatrixHOA : Ambi3DMatrixFOA;
-
 /* Set this to 2 for dual-band HRTF processing. May require a higher quality
  * band-splitter, or better calculation of the new IR length to deal with the
  * tail generated by the filter.
  */
 #define NUM_BANDS 2
     BandSplitter splitter;
-    ALsizei lidx[HRTF_AMBI_CHAN_COUNT], ridx[HRTF_AMBI_CHAN_COUNT];
+    ALsizei lidx[HRTF_AMBI_MAX_CHANNELS], ridx[HRTF_AMBI_MAX_CHANNELS];
     ALsizei min_delay = HRTF_HISTORY_LENGTH;
     ALfloat temps[3][HRIR_LENGTH];
     ALsizei max_length = 0;
     ALsizei i, j, c, b;
 
-    for(c = 0;c < HRTF_AMBI_CHAN_COUNT;c++)
+    for(c = 0;c < AmbiCount;c++)
     {
         ALuint evidx, azidx;
         ALuint evoffset;
         ALuint azcount;
 
         /* Calculate elevation index. */
-        evidx = (ALsizei)floorf((F_PI_2 + Ambi3DPoints[c].elevation) *
+        evidx = (ALsizei)floorf((F_PI_2 + AmbiPoints[c][0]) *
                                 (Hrtf->evCount-1)/F_PI + 0.5f);
         evidx = mini(evidx, Hrtf->evCount-1);
 
@@ -219,7 +165,7 @@ ALsizei BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH]
         evoffset = Hrtf->evOffset[evidx];
 
         /* Calculate azimuth index for this elevation. */
-        azidx = (ALsizei)floorf((F_TAU+Ambi3DPoints[c].azimuth) *
+        azidx = (ALsizei)floorf((F_TAU+AmbiPoints[c][1]) *
                                 azcount/F_TAU + 0.5f) % azcount;
 
         /* Calculate indices for left and right channels. */
@@ -231,7 +177,7 @@ ALsizei BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH]
 
     memset(temps, 0, sizeof(temps));
     bandsplit_init(&splitter, 400.0f / (ALfloat)Hrtf->sampleRate);
-    for(c = 0;c < HRTF_AMBI_CHAN_COUNT;c++)
+    for(c = 0;c < AmbiCount;c++)
     {
         const ALshort *fir;
         ALsizei delay;
@@ -256,12 +202,11 @@ ALsizei BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH]
         delay = Hrtf->delays[lidx[c]] - min_delay;
         for(i = 0;i < NumChannels;++i)
         {
-            const ALsizei a = AmbiMap ? AmbiMap[i] : i;
             for(b = 0;b < NUM_BANDS;b++)
             {
                 ALsizei k = 0;
                 for(j = delay;j < HRIR_LENGTH;++j)
-                    coeffs[i][j][0] += temps[b][k++] * Ambi3DMatrix[c][b][a];
+                    coeffs[i][j][0] += temps[b][k++] * AmbiMatrix[c][b][i];
             }
         }
         max_length = maxi(max_length, mini(delay + Hrtf->irSize, HRIR_LENGTH));
@@ -286,21 +231,19 @@ ALsizei BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH]
         delay = Hrtf->delays[ridx[c]] - min_delay;
         for(i = 0;i < NumChannels;++i)
         {
-            const ALsizei a = AmbiMap ? AmbiMap[i] : i;
             for(b = 0;b < NUM_BANDS;b++)
             {
                 ALuint k = 0;
                 for(j = delay;j < HRIR_LENGTH;++j)
-                    coeffs[i][j][1] += temps[b][k++] * Ambi3DMatrix[c][b][a];
+                    coeffs[i][j][1] += temps[b][k++] * AmbiMatrix[c][b][i];
             }
         }
         max_length = maxi(max_length, mini(delay + Hrtf->irSize, HRIR_LENGTH));
     }
     TRACE("Skipped min delay: %d, new combined length: %d\n", min_delay, max_length);
-#undef NUM_BANDS
 
     return max_length;
-#undef HRTF_AMBI_CHAN_COUNT
+#undef NUM_BANDS
 }
 
 
diff --git a/Alc/hrtf.h b/Alc/hrtf.h
index 5ac4a03d..83cc64d1 100644
--- a/Alc/hrtf.h
+++ b/Alc/hrtf.h
@@ -4,6 +4,7 @@
 #include "AL/al.h"
 #include "AL/alc.h"
 
+#include "alMain.h"
 #include "alstring.h"
 
 
@@ -21,20 +22,15 @@ struct Hrtf {
     struct Hrtf *next;
 };
 
-typedef struct HrtfEntry {
-    al_string name;
-
-    const struct Hrtf *hrtf;
-} HrtfEntry;
-TYPEDEF_VECTOR(HrtfEntry, vector_HrtfEntry)
-
-#define HRIR_BITS        (7)
-#define HRIR_LENGTH      (1<<HRIR_BITS)
-#define HRIR_MASK        (HRIR_LENGTH-1)
 #define HRTFDELAY_BITS    (20)
 #define HRTFDELAY_FRACONE (1<<HRTFDELAY_BITS)
 #define HRTFDELAY_MASK    (HRTFDELAY_FRACONE-1)
 
+/* The maximum number of virtual speakers used to generate HRTF coefficients
+ * for decoding B-Format.
+ */
+#define HRTF_AMBI_MAX_CHANNELS 16
+
 void FreeHrtfs(void);
 
 vector_HrtfEntry EnumerateHrtf(const_al_string devname);
@@ -42,11 +38,12 @@ void FreeHrtfList(vector_HrtfEntry *list);
 
 void GetHrtfCoeffs(const struct Hrtf *Hrtf, ALfloat elevation, ALfloat azimuth, ALfloat spread, ALfloat gain, ALfloat (*coeffs)[2], ALsizei *delays);
 
-/* Produces HRTF filter coefficients for decoding B-Format. The result will
- * have ACN ordering with N3D normalization. NumChannels must currently be 4,
- * for first-order. Returns the maximum impulse-response length of the
- * generated coefficients.
+/**
+ * Produces HRTF filter coefficients for decoding B-Format, given a set of
+ * virtual speaker positions and HF/LF matrices for decoding to them. The
+ * returned coefficients are ordered and scaled according to the matrices.
+ * Returns the maximum impulse-response length of the generated coefficients.
  */
-ALsizei BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][2], ALsizei NumChannels, const ALsizei *AmbiMap);
+ALsizei BuildBFormatHrtf(const struct Hrtf *Hrtf, ALfloat (*coeffs)[HRIR_LENGTH][2], ALsizei NumChannels, const ALfloat (*restrict AmbiPoints)[2], const ALfloat (*restrict AmbiMatrix)[2][MAX_AMBI_COEFFS], ALsizei AmbiCount);
 
 #endif /* ALC_HRTF_H */
diff --git a/Alc/panning.c b/Alc/panning.c
index a0576e0d..8073bb20 100644
--- a/Alc/panning.c
+++ b/Alc/panning.c
@@ -758,18 +758,65 @@ static void InitHQPanning(ALCdevice *device, const AmbDecConf *conf, const ALuin
 
 static void InitHrtfPanning(ALCdevice *device, bool hoa_mode)
 {
-    static const ALsizei map_foa[] = { 0, 1, 2, 3 };
-    static const ALsizei map_hoa[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8 };
-    const ALsizei *ambi_map = hoa_mode ? map_hoa : map_foa;
-    size_t count = hoa_mode ? COUNTOF(map_hoa) : COUNTOF(map_foa);
+    /* NOTE: azimuth goes clockwise. */
+    static const ALfloat AmbiPoints[][2] = {
+        { DEG2RAD( 90.0f), DEG2RAD(   0.0f) },
+        { DEG2RAD( 35.0f), DEG2RAD( -45.0f) },
+        { DEG2RAD( 35.0f), DEG2RAD(  45.0f) },
+        { DEG2RAD( 35.0f), DEG2RAD( 135.0f) },
+        { DEG2RAD( 35.0f), DEG2RAD(-135.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD(   0.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD(  90.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD( 180.0f) },
+        { DEG2RAD(  0.0f), DEG2RAD( -90.0f) },
+        { DEG2RAD(-35.0f), DEG2RAD( -45.0f) },
+        { DEG2RAD(-35.0f), DEG2RAD(  45.0f) },
+        { DEG2RAD(-35.0f), DEG2RAD( 135.0f) },
+        { DEG2RAD(-35.0f), DEG2RAD(-135.0f) },
+        { DEG2RAD(-90.0f), DEG2RAD(   0.0f) },
+    };
+    static const ALfloat AmbiMatrixFOA[][2][MAX_AMBI_COEFFS] = {
+        { { 1.88982237e-001f,  0.00000000e+000f,  1.90399923e-001f,  0.00000000e+000f }, { 7.14285714e-002f,  0.00000000e+000f,  1.24646009e-001f,  0.00000000e+000f } },
+        { { 1.88982237e-001f,  1.09057783e-001f,  1.09208910e-001f,  1.09057783e-001f }, { 7.14285714e-002f,  7.13950780e-002f,  7.14940135e-002f,  7.13950780e-002f } },
+        { { 1.88982237e-001f, -1.09057783e-001f,  1.09208910e-001f,  1.09057783e-001f }, { 7.14285714e-002f, -7.13950780e-002f,  7.14940135e-002f,  7.13950780e-002f } },
+        { { 1.88982237e-001f, -1.09057783e-001f,  1.09208910e-001f, -1.09057783e-001f }, { 7.14285714e-002f, -7.13950780e-002f,  7.14940135e-002f, -7.13950780e-002f } },
+        { { 1.88982237e-001f,  1.09057783e-001f,  1.09208910e-001f, -1.09057783e-001f }, { 7.14285714e-002f,  7.13950780e-002f,  7.14940135e-002f, -7.13950780e-002f } },
+        { { 1.88982237e-001f,  0.00000000e+000f,  0.00000000e+000f,  1.88281281e-001f }, { 7.14285714e-002f,  0.00000000e+000f,  0.00000000e+000f,  1.23259031e-001f } },
+        { { 1.88982237e-001f, -1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f }, { 7.14285714e-002f, -1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f } },
+        { { 1.88982237e-001f,  0.00000000e+000f,  0.00000000e+000f, -1.88281281e-001f }, { 7.14285714e-002f,  0.00000000e+000f,  0.00000000e+000f, -1.23259031e-001f } },
+        { { 1.88982237e-001f,  1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f }, { 7.14285714e-002f,  1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f } },
+        { { 1.88982237e-001f,  1.09057783e-001f, -1.09208910e-001f,  1.09057783e-001f }, { 7.14285714e-002f,  7.13950780e-002f, -7.14940135e-002f,  7.13950780e-002f } },
+        { { 1.88982237e-001f, -1.09057783e-001f, -1.09208910e-001f,  1.09057783e-001f }, { 7.14285714e-002f, -7.13950780e-002f, -7.14940135e-002f,  7.13950780e-002f } },
+        { { 1.88982237e-001f, -1.09057783e-001f, -1.09208910e-001f, -1.09057783e-001f }, { 7.14285714e-002f, -7.13950780e-002f, -7.14940135e-002f, -7.13950780e-002f } },
+        { { 1.88982237e-001f,  1.09057783e-001f, -1.09208910e-001f, -1.09057783e-001f }, { 7.14285714e-002f,  7.13950780e-002f, -7.14940135e-002f, -7.13950780e-002f } },
+        { { 1.88982237e-001f,  0.00000000e+000f, -1.90399923e-001f,  0.00000000e+000f }, { 7.14285714e-002f,  0.00000000e+000f, -1.24646009e-001f,  0.00000000e+000f } }
+    }, AmbiMatrixHOA[][2][MAX_AMBI_COEFFS] = {
+        { { 1.43315266e-001f,  0.00000000e+000f,  1.90399923e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  1.18020996e-001f,  0.00000000e+000f,  0.00000000e+000f }, { 7.26741039e-002f,  0.00000000e+000f,  1.24646009e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  1.49618920e-001f,  0.00000000e+000f,  0.00000000e+000f } },
+        { { 1.40852210e-001f,  1.09057783e-001f,  1.09208910e-001f,  1.09057783e-001f,  7.58818830e-002f,  7.66295578e-002f, -3.28314629e-004f,  7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f,  7.13950780e-002f,  7.14940135e-002f,  7.13950780e-002f,  9.61978444e-002f,  9.71456952e-002f, -4.16214759e-004f,  9.71456952e-002f,  0.00000000e+000f } },
+        { { 1.40852210e-001f, -1.09057783e-001f,  1.09208910e-001f,  1.09057783e-001f, -7.58818830e-002f, -7.66295578e-002f, -3.28314629e-004f,  7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f, -7.13950780e-002f,  7.14940135e-002f,  7.13950780e-002f, -9.61978444e-002f, -9.71456952e-002f, -4.16214759e-004f,  9.71456952e-002f,  0.00000000e+000f } },
+        { { 1.40852210e-001f, -1.09057783e-001f,  1.09208910e-001f, -1.09057783e-001f,  7.58818830e-002f, -7.66295578e-002f, -3.28314629e-004f, -7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f, -7.13950780e-002f,  7.14940135e-002f, -7.13950780e-002f,  9.61978444e-002f, -9.71456952e-002f, -4.16214759e-004f, -9.71456952e-002f,  0.00000000e+000f } },
+        { { 1.40852210e-001f,  1.09057783e-001f,  1.09208910e-001f, -1.09057783e-001f, -7.58818830e-002f,  7.66295578e-002f, -3.28314629e-004f, -7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f,  7.13950780e-002f,  7.14940135e-002f, -7.13950780e-002f, -9.61978444e-002f,  9.71456952e-002f, -4.16214759e-004f, -9.71456952e-002f,  0.00000000e+000f } },
+        { { 1.39644596e-001f,  0.00000000e+000f,  0.00000000e+000f,  1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f, -5.83538687e-002f,  0.00000000e+000f,  1.01835015e-001f }, { 7.08127349e-002f,  0.00000000e+000f,  0.00000000e+000f,  1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f, -7.39770307e-002f,  0.00000000e+000f,  1.29099445e-001f } },
+        { { 1.39644596e-001f, -1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f, -5.83538687e-002f,  0.00000000e+000f, -1.01835015e-001f }, { 7.08127349e-002f, -1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f, -7.39770307e-002f,  0.00000000e+000f, -1.29099445e-001f } },
+        { { 1.39644596e-001f,  0.00000000e+000f,  0.00000000e+000f, -1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f, -5.83538687e-002f,  0.00000000e+000f,  1.01835015e-001f }, { 7.08127349e-002f,  0.00000000e+000f,  0.00000000e+000f, -1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f, -7.39770307e-002f,  0.00000000e+000f,  1.29099445e-001f } },
+        { { 1.39644596e-001f,  1.88281281e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f, -5.83538687e-002f,  0.00000000e+000f, -1.01835015e-001f }, { 7.08127349e-002f,  1.23259031e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f, -7.39770307e-002f,  0.00000000e+000f, -1.29099445e-001f } },
+        { { 1.40852210e-001f,  1.09057783e-001f, -1.09208910e-001f,  1.09057783e-001f,  7.58818830e-002f, -7.66295578e-002f, -3.28314629e-004f, -7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f,  7.13950780e-002f, -7.14940135e-002f,  7.13950780e-002f,  9.61978444e-002f, -9.71456952e-002f, -4.16214759e-004f, -9.71456952e-002f,  0.00000000e+000f } },
+        { { 1.40852210e-001f, -1.09057783e-001f, -1.09208910e-001f,  1.09057783e-001f, -7.58818830e-002f,  7.66295578e-002f, -3.28314629e-004f, -7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f, -7.13950780e-002f, -7.14940135e-002f,  7.13950780e-002f, -9.61978444e-002f,  9.71456952e-002f, -4.16214759e-004f, -9.71456952e-002f,  0.00000000e+000f } },
+        { { 1.40852210e-001f, -1.09057783e-001f, -1.09208910e-001f, -1.09057783e-001f,  7.58818830e-002f,  7.66295578e-002f, -3.28314629e-004f,  7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f, -7.13950780e-002f, -7.14940135e-002f, -7.13950780e-002f,  9.61978444e-002f,  9.71456952e-002f, -4.16214759e-004f,  9.71456952e-002f,  0.00000000e+000f } },
+        { { 1.40852210e-001f,  1.09057783e-001f, -1.09208910e-001f, -1.09057783e-001f, -7.58818830e-002f, -7.66295578e-002f, -3.28314629e-004f,  7.66295578e-002f,  0.00000000e+000f }, { 7.14251066e-002f,  7.13950780e-002f, -7.14940135e-002f, -7.13950780e-002f, -9.61978444e-002f, -9.71456952e-002f, -4.16214759e-004f,  9.71456952e-002f,  0.00000000e+000f } },
+        { { 1.43315266e-001f,  0.00000000e+000f, -1.90399923e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  1.18020996e-001f,  0.00000000e+000f,  0.00000000e+000f }, { 7.26741039e-002f,  0.00000000e+000f, -1.24646009e-001f,  0.00000000e+000f,  0.00000000e+000f,  0.00000000e+000f,  1.49618920e-001f,  0.00000000e+000f,  0.00000000e+000f } },
+    };
+    const ALfloat (*AmbiMatrix)[2][MAX_AMBI_COEFFS] = hoa_mode ? AmbiMatrixHOA : AmbiMatrixFOA;
+    size_t count = hoa_mode ? 9 : 4;
     size_t i;
 
-    static_assert(COUNTOF(map_hoa) <= COUNTOF(device->Hrtf.Coeffs), "ALCdevice::Hrtf.Values/Coeffs size is too small");
+    static_assert(9 <= COUNTOF(device->Hrtf.Coeffs), "ALCdevice::Hrtf.Values/Coeffs size is too small");
+    static_assert(COUNTOF(AmbiPoints) <= HRTF_AMBI_MAX_CHANNELS, "HRTF_AMBI_MAX_CHANNELS is too small");
 
     for(i = 0;i < count;i++)
     {
         device->Dry.Ambi.Map[i].Scale = 1.0f;
-        device->Dry.Ambi.Map[i].Index = ambi_map[i];
+        device->Dry.Ambi.Map[i].Index = i;
     }
     device->Dry.CoeffCount = 0;
     device->Dry.NumChannels = count;
@@ -794,7 +841,8 @@ static void InitHrtfPanning(ALCdevice *device, bool hoa_mode)
 
     memset(device->Hrtf.Coeffs, 0, sizeof(device->Hrtf.Coeffs));
     device->Hrtf.IrSize = BuildBFormatHrtf(device->Hrtf.Handle,
-        device->Hrtf.Coeffs, device->Dry.NumChannels, hoa_mode ? ambi_map : NULL
+        device->Hrtf.Coeffs, device->Dry.NumChannels,
+        AmbiPoints, AmbiMatrix, COUNTOF(AmbiPoints)
     );
 
     /* Round up to the nearest multiple of 8 */