From ce8b2974a3f93ec66995442329765084306b53f2 Mon Sep 17 00:00:00 2001
From: "alexey.lysiuk" <alexey.lysiuk@gmail.com>
Date: Sat, 13 Feb 2016 11:09:37 +0200
Subject: [PATCH] Handle inability of OpenAL implementation to return number of
 available sources

OpenAL specification doesn't require alcGetIntegerv() to return meaningful values for ALC_MONO_SOURCES and ALC_MONO_SOURCES.
At least Apple's OpenAL implementation returns zeroes, although it can generate reasonable number of sources.
---
 src/sound/oalsound.cpp | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/sound/oalsound.cpp b/src/sound/oalsound.cpp
index 1eec34c1b..736893de7 100644
--- a/src/sound/oalsound.cpp
+++ b/src/sound/oalsound.cpp
@@ -781,7 +781,20 @@ OpenALSoundRenderer::OpenALSoundRenderer()
     alcGetIntegerv(Device, ALC_MONO_SOURCES, 1, &numMono);
     alcGetIntegerv(Device, ALC_STEREO_SOURCES, 1, &numStereo);
 
-    Sources.Resize(MIN<int>(MAX<int>(*snd_channels, 2), numMono+numStereo));
+    // OpenAL specification doesn't require alcGetIntegerv() to return
+    // meaningful values for ALC_MONO_SOURCES and ALC_MONO_SOURCES.
+    // At least Apple's OpenAL implementation returns zeroes,
+    // although it can generate reasonable number of sources.
+
+    const int numChannels = MAX<int>(*snd_channels, 2);
+    int numSources = numMono + numStereo;
+
+    if (0 == numSources)
+    {
+        numSources = numChannels;
+    }
+
+    Sources.Resize(MIN<int>(numChannels, numSources));
     for(size_t i = 0;i < Sources.Size();i++)
     {
         alGenSources(1, &Sources[i]);