Blend the whole IR for the interpolated HRIR

The SIMD mixers may use a few more elements beyond the irSize, so not limiting
the blend to that size can slightly improve the quality for resampled HRIRs.

1 files changed, 4 insertions, 7 deletions

diff --git a/alc/hrtf.cpp b/alc/hrtf.cpp
index 80d5ebd0..2ac4c539 100644
--- a/alc/hrtf.cpp
+++ b/alc/hrtf.cpp
@@ -258,21 +258,18 @@ void GetHrtfCoeffs(const HrtfStore *Hrtf, float elevation, float azimuth, float
         Hrtf->delays[idx[2]][1]*blend[2] + Hrtf->delays[idx[3]][1]*blend[3];
     delays[1] = fastf2u(d * float{1.0f/HRIR_DELAY_FRACONE});
 
-    const ALuint irSize{Hrtf->irSize};
-    ASSUME(irSize >= MIN_IR_LENGTH);
-
     /* Calculate the blended HRIR coefficients. */
     float *coeffout{al::assume_aligned<16>(&coeffs[0][0])};
     coeffout[0] = PassthruCoeff * (1.0f-dirfact);
     coeffout[1] = PassthruCoeff * (1.0f-dirfact);
-    std::fill(coeffout+2, coeffout + HRIR_LENGTH*2, 0.0f);
-    for(ALsizei c{0};c < 4;c++)
+    std::fill_n(coeffout+2, size_t{HRIR_LENGTH-1}*2, 0.0f);
+    for(size_t c{0};c < 4;c++)
     {
         const float *srccoeffs{al::assume_aligned<16>(Hrtf->coeffs[idx[c]][0].data())};
         const float mult{blend[c]};
-        auto blend_coeffs = [mult](const ALfloat src, const ALfloat coeff) noexcept -> ALfloat
+        auto blend_coeffs = [mult](const float src, const float coeff) noexcept -> float
         { return src*mult + coeff; };
-        std::transform(srccoeffs, srccoeffs + irSize*2, coeffout, coeffout, blend_coeffs);
+        std::transform(srccoeffs, srccoeffs + HRIR_LENGTH*2, coeffout, coeffout, blend_coeffs);
     }
 }