switch back to openal 1.20.1

revert commit 403eaadaea

openal/include/alc.h

@@ -31,9 +31,9 @@ extern "C" {
 #define ALC_VERSION_0_1                          1
 
 /** Opaque device handle */
-typedef struct ALCdevice_struct ALCdevice;
+typedef struct ALCdevice ALCdevice;
 /** Opaque context handle */
-typedef struct ALCcontext_struct ALCcontext;
+typedef struct ALCcontext ALCcontext;
 
 /** 8-bit boolean */
 typedef char ALCboolean;

openal/include/alext.h

@@ -509,6 +509,27 @@ ALC_API void ALC_APIENTRY alcGetInteger64vSOFT(ALCdevice *device, ALCenum pname,
 #endif
 #endif
 
+#ifndef AL_SOFT_direct_channels_remix
+#define AL_SOFT_direct_channels_remix 1
+#define AL_DROP_UNMATCHED_SOFT                   0x0001
+#define AL_REMIX_UNMATCHED_SOFT                  0x0002
+#endif
+
+#ifndef AL_SOFT_bformat_ex
+#define AL_SOFT_bformat_ex 1
+#define AL_AMBISONIC_LAYOUT_SOFT                 0x1997
+#define AL_AMBISONIC_SCALING_SOFT                0x1998
+
+/* Ambisonic layouts */
+#define AL_FUMA_SOFT                             0x0000
+#define AL_ACN_SOFT                              0x0001
+
+/* Ambisonic scalings (normalization) */
+/*#define AL_FUMA_SOFT*/
+#define AL_SN3D_SOFT                             0x0001
+#define AL_N3D_SOFT                              0x0002
+#endif
+
 #ifdef __cplusplus
 }
 #endif

openal/include/efx.h

@@ -1,6 +1,7 @@
 #ifndef AL_EFX_H
 #define AL_EFX_H
 
+#include <float.h>
 
 #include "alc.h"
 #include "al.h"