Add macros for the ambisonic order masks

1 files changed, 11 insertions, 3 deletions

diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index 132e6c21..8eafa6a4 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -550,11 +550,19 @@ enum RenderMode {
 #define MAX_AMBI_ORDER  3
 #define MAX_AMBI_COEFFS ((MAX_AMBI_ORDER+1) * (MAX_AMBI_ORDER+1))
 
+/* A bitmask of ambisonic channels for 0 to 4th order. This only specifies up
+ * to 4th order, which is the highest order a 32-bit mask value can specify (a
+ * 64-bit mask could handle up to 7th order).
+ */
+#define AMBI_0ORDER_MASK 0x00000001
+#define AMBI_1ORDER_MASK 0x0000000f
+#define AMBI_2ORDER_MASK 0x000001ff
+#define AMBI_3ORDER_MASK 0x0000ffff
+#define AMBI_4ORDER_MASK 0x01ffffff
+
 /* A bitmask of ambisonic channels with height information. If none of these
  * channels are used/needed, there's no height (e.g. with most surround sound
- * speaker setups). This only specifies up to 4th order, which is the highest
- * order a 32-bit mask value can specify (a 64-bit mask could handle up to 7th
- * order). This is ACN ordering, with bit 0 being ACN 0, etc.
+ * speaker setups). This is ACN ordering, with bit 0 being ACN 0, etc.
  */
 #define AMBI_PERIPHONIC_MASK (0xfe7ce4)