From a8993eb776b5578eee94b991383d6ce23df3acdd Mon Sep 17 00:00:00 2001
From: cosmonaut <evan@moonside.games>
Date: Sun, 24 Oct 2021 16:24:37 -0700
Subject: [PATCH] add spatial distance scaler to init

---
 src/FAudioGMS.c | 12 ++++++------
 src/FAudioGMS.h |  2 +-
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/FAudioGMS.c b/src/FAudioGMS.c
index 7541012..d8ab510 100644
--- a/src/FAudioGMS.c
+++ b/src/FAudioGMS.c
@@ -132,8 +132,8 @@ typedef struct FAudioGMS_SoundInstance
     } parent;
 } FAudioGMS_SoundInstance;
 
+static const float SPEED_OF_SOUND = 343.5f;
 static const float DOPPLER_SCALE = 1.0f;
-static const float CURVE_DISTANCE_SCALER = 1.0f;
 
 typedef struct FAudioGMS_Device
 {
@@ -144,7 +144,7 @@ typedef struct FAudioGMS_Device
     FAudioMasteringVoice *masteringVoice;
 
     F3DAUDIO_LISTENER listener;
-    float speedOfSound;
+    float spatialDistanceScale;
 
     FAudioGMS_StaticSound **staticSounds;
     uint32_t staticSoundCount;
@@ -183,7 +183,7 @@ static inline FAudioGMS_SoundInstance* FAudioGMS_INTERNAL_LookupSoundInstance(ui
     }
 }
 
-void FAudioGMS_Init(double speedOfSound)
+void FAudioGMS_Init(double spatialDistanceScale)
 {
     device = SDL_malloc(sizeof(FAudioGMS_Device));
 
@@ -256,11 +256,11 @@ void FAudioGMS_Init(double speedOfSound)
         return;
     }
 
-    device->speedOfSound = speedOfSound;
+    device->spatialDistanceScale = spatialDistanceScale;
 
     F3DAudioInitialize(
         device->deviceDetails.OutputFormat.dwChannelMask,
-        device->speedOfSound,
+        SPEED_OF_SOUND,
         device->handle3D
     );
 
@@ -781,7 +781,7 @@ static void FAudioGMS_INTERNAL_StaticSound_AddEmitter(FAudioGMS_SoundInstance* i
     instance->emitter->InnerRadiusAngle = 0;
 
     instance->emitter->ChannelCount = instance->dspSettings.SrcChannelCount;
-    instance->emitter->CurveDistanceScaler = CURVE_DISTANCE_SCALER;
+    instance->emitter->CurveDistanceScaler = device->spatialDistanceScale;
     instance->emitter->DopplerScaler = 1.0f;
 
     instance->emitter->Position.x = x;
diff --git a/src/FAudioGMS.h b/src/FAudioGMS.h
index afdbf2c..306bda6 100644
--- a/src/FAudioGMS.h
+++ b/src/FAudioGMS.h
@@ -39,7 +39,7 @@
 extern "C" {
 #endif /* __cplusplus */
 
-FAUDIOGMSAPI void FAudioGMS_Init(double speedOfSound); /* recommend about 1500? for 2D game */
+FAUDIOGMSAPI void FAudioGMS_Init(double spatialDistanceScale); /* recommend about 50 for a 2D game, 1 for a 3D game */
 
 FAUDIOGMSAPI double FAudioGMS_StaticSound_LoadWAV(char *filePath); /* returns a static sound ID */
 FAUDIOGMSAPI void FAudioGMS_StaticSound_PlayOneOff(double staticSoundID, double pan, double pitch, double volume, double reverb); /* automatically frees itself when done! */