Do air absorption with linear gain values

This copies the way the calculation is done with the wet path

2 files changed, 2 insertions, 12 deletions

diff --git a/Alc/ALu.c b/Alc/ALu.c
index 66cf6009..7cddb5a8 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -537,17 +537,7 @@ ALvoid CalcSourceParams(ALsource *ALSource, const ALCcontext *ALContext)
 
     // Distance-based air absorption
     if(AirAbsorptionFactor > 0.0f && EffectiveDist > 0.0f)
-    {
-        ALfloat absorb;
-
-        // Absorption calculation is done in dB
-        absorb = (AirAbsorptionFactor*AIRABSORBGAINDBHF) *
-                 EffectiveDist;
-        // Convert dB to linear gain before applying
-        absorb = aluPow(10.0f, absorb/20.0f);
-
-        DryGainHF *= absorb;
-    }
+        DryGainHF *= aluPow(AIRABSORBGAINHF, AirAbsorptionFactor*EffectiveDist);
 
     //3. Apply directional soundcones
     Angle = aluAcos(aluDotproduct(Direction,SourceToListener)) * (180.0/M_PI);
diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index 5a5bbd93..7ed9c636 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -210,7 +210,7 @@ extern "C" {
 #define DEFAULT_OUTPUT_RATE        (44100)
 
 #define SPEEDOFSOUNDMETRESPERSEC   (343.3f)
-#define AIRABSORBGAINDBHF          (-0.05f)
+#define AIRABSORBGAINHF            (0.99426) /* -0.05dB */
 
 #define LOWPASSFREQCUTOFF          (5000)