diff options
| -rw-r--r-- | Alc/panning.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/Alc/panning.c b/Alc/panning.c index a5cddcb2..0abf18db 100644 --- a/Alc/panning.c +++ b/Alc/panning.c @@ -152,8 +152,7 @@ void CalcDirectionCoeffs(const ALfloat dir[3], ALfloat spread, ALfloat coeffs[MA * ZH5 = -0.0625*sqrt(pi) * (-1+ca)*(ca+1)*(21*ca*ca*ca*ca - 14*ca*ca + 1); * * The gain of the source is compensated for size, so that the - * loundness doesn't depend on the spread. That is, the factors are - * scaled so that ZH0 remains 1 regardless of the spread. Thus: + * loundness doesn't depend on the spread. Thus: * * ZH0 = 1.0f; * ZH1 = 0.5f * (ca+1.0f); @@ -163,11 +162,13 @@ void CalcDirectionCoeffs(const ALfloat dir[3], ALfloat spread, ALfloat coeffs[MA * ZH5 = 0.0625f * (ca+1.0f)*(21.0f*ca*ca*ca*ca - 14.0f*ca*ca + 1.0f); */ ALfloat ca = cosf(spread * 0.5f); + /* Increase the source volume by up to +3dB for a full spread. */ + ALfloat scale = sqrtf(1.0f + spread/F_TAU); - ALfloat ZH0_norm = 1.0f; - ALfloat ZH1_norm = 0.5f * (ca+1.f); - ALfloat ZH2_norm = 0.5f * (ca+1.f)*ca; - ALfloat ZH3_norm = 0.125f * (ca+1.f)*(5.f*ca*ca-1.f); + ALfloat ZH0_norm = scale; + ALfloat ZH1_norm = 0.5f * (ca+1.f) * scale; + ALfloat ZH2_norm = 0.5f * (ca+1.f)*ca * scale; + ALfloat ZH3_norm = 0.125f * (ca+1.f)*(5.f*ca*ca-1.f) * scale; /* Zeroth-order */ coeffs[0] *= ZH0_norm; |