From 28f80fa113be3488e98abb9fd6863277d2b94180 Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Mon, 17 Dec 2007 19:40:43 -0800
Subject: [PATCH] Add AL_METERS_PER_UNIT listener property

---
 Alc/ALc.c                     |  1 +
 Alc/ALu.c                     |  2 ++
 OpenAL32/Include/alListener.h |  1 +
 OpenAL32/alListener.c         | 22 ++++++++++++++++++++++
 4 files changed, 26 insertions(+)

diff --git a/Alc/ALc.c b/Alc/ALc.c
index f8cf5232..c3dd083e 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -340,6 +340,7 @@ static ALvoid InitContext(ALCcontext *pContext)
 {
     //Initialise listener
     pContext->Listener.Gain = 1.0f;
+    pContext->Listener.MetersPerUnit = 1.0f;
     pContext->Listener.Position[0] = 0.0f;
     pContext->Listener.Position[1] = 0.0f;
     pContext->Listener.Position[2] = 0.0f;
diff --git a/Alc/ALu.c b/Alc/ALu.c
index 0821d6b4..92529b4e 100644
--- a/Alc/ALu.c
+++ b/Alc/ALu.c
@@ -167,6 +167,7 @@ static ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource,
     ALfloat Matrix[3][3];
     ALint HeadRelative;
     ALfloat flAttenuation;
+    ALfloat MetersPerUnit;
 
     //Get context properties
     DopplerFactor   = ALContext->DopplerFactor;
@@ -176,6 +177,7 @@ static ALvoid CalcSourceParams(ALCcontext *ALContext, ALsource *ALSource,
 
     //Get listener properties
     ListenerGain = ALContext->Listener.Gain;
+    MetersPerUnit = ALContext->Listener.MetersPerUnit;
     memcpy(ListenerPosition, ALContext->Listener.Position, sizeof(ALContext->Listener.Position));
     memcpy(ListenerVelocity, ALContext->Listener.Velocity, sizeof(ALContext->Listener.Velocity));
     memcpy(&ListenerOrientation[0], ALContext->Listener.Forward, sizeof(ALContext->Listener.Forward));
diff --git a/OpenAL32/Include/alListener.h b/OpenAL32/Include/alListener.h
index 587b2151..d22261fa 100644
--- a/OpenAL32/Include/alListener.h
+++ b/OpenAL32/Include/alListener.h
@@ -16,6 +16,7 @@ typedef struct ALlistener_struct
     ALfloat Forward[3];
     ALfloat Up[3];
     ALfloat Gain;
+    ALfloat MetersPerUnit;
 } ALlistener;
 
 #ifdef __cplusplus
diff --git a/OpenAL32/alListener.c b/OpenAL32/alListener.c
index 97fc593c..1e02622a 100644
--- a/OpenAL32/alListener.c
+++ b/OpenAL32/alListener.c
@@ -41,6 +41,13 @@ ALAPI ALvoid ALAPIENTRY alListenerf(ALenum eParam, ALfloat flValue)
                 alSetError(AL_INVALID_VALUE);
             break;
 
+        case AL_METERS_PER_UNIT:
+            if (flValue > 0.0f)
+                pContext->Listener.MetersPerUnit = flValue;
+            else
+                alSetError(AL_INVALID_VALUE);
+            break;
+
         default:
             alSetError(AL_INVALID_ENUM);
             break;
@@ -112,6 +119,13 @@ ALAPI ALvoid ALAPIENTRY alListenerfv(ALenum eParam, const ALfloat *pflValues)
                     alSetError(AL_INVALID_VALUE);
                 break;
 
+            case AL_METERS_PER_UNIT:
+                if (pflValues[0] > 0.0f)
+                    pContext->Listener.MetersPerUnit = pflValues[0];
+                else
+                    alSetError(AL_INVALID_VALUE);
+                break;
+
             case AL_POSITION:
                 pContext->Listener.Position[0] = pflValues[0];
                 pContext->Listener.Position[1] = pflValues[1];
@@ -274,6 +288,10 @@ ALAPI ALvoid ALAPIENTRY alGetListenerf(ALenum eParam, ALfloat *pflValue)
                 *pflValue = pContext->Listener.Gain;
                 break;
 
+            case AL_METERS_PER_UNIT:
+                *pflValue = pContext->Listener.MetersPerUnit;
+                break;
+
             default:
                 alSetError(AL_INVALID_ENUM);
                 break;
@@ -350,6 +368,10 @@ ALAPI ALvoid ALAPIENTRY alGetListenerfv(ALenum eParam, ALfloat *pflValues)
                 pflValues[0] = pContext->Listener.Gain;
                 break;
 
+            case AL_METERS_PER_UNIT:
+                pflValues[0] = pContext->Listener.MetersPerUnit;
+                break;
+
             case AL_POSITION:
                 pflValues[0] = pContext->Listener.Position[0];
                 pflValues[1] = pContext->Listener.Position[1];
-- 
2.11.4.GIT