Add AL.EXT_float32 to playback 32-bit audio samples

Author: jgranick

src/lime/_internal/backend/native/NativeAudioSource.hx

@@ -1,5 +1,6 @@
 package lime._internal.backend.native;
 
+import lime.media.openal.ext.EXT_float32;
 import haxe.Int64;
 import haxe.Timer;
 import lime.app.Application;
@@ -92,6 +93,10 @@ class NativeAudioSource
 			{
 				format = AL.FORMAT_MONO16;
 			}
+			else
+			{
+				format = EXT_float32.FORMAT_MONO_FLOAT32;
+			}
 		}
 		else if (parent.buffer.channels == 2)
 		{
@@ -103,6 +108,10 @@ class NativeAudioSource
 			{
 				format = AL.FORMAT_STEREO16;
 			}
+			else
+			{
+				format = EXT_float32.FORMAT_STEREO_FLOAT32;
+			}
 		}
 
 		if (parent.buffer.__srcVorbisFile != null)

src/lime/media/openal/ext/EXT_float32.hx

@@ -0,0 +1,7 @@
+package lime.media.openal.ext;
+
+class EXT_float32
+{
+	public static var FORMAT_MONO_FLOAT32:Int = 0x10010;
+	public static var FORMAT_STEREO_FLOAT32:Int = 0x10011;
+}